Adding upstream version 2.4.1.upstream/2.4.1 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 12:15:43 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-13 12:15:43 +0000
commit: f5f56e1a1c4d9e9496fcb9d81131066a964ccd23 (patch)
tree: 49e44c6f87febed37efb953ab5485aa49f6481a7 /src/lib/eval
parent: Initial commit. (diff)
download: isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.tar.xz
isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.zip
31 files changed, 21872 insertions, 0 deletions
diff --git a/src/lib/eval/Makefile.am b/src/lib/eval/Makefile.am
new file mode 100644
index 0000000..ded89f2
--- /dev/null
+++ b/src/lib/eval/Makefile.am
@@ -0,0 +1,139 @@
+SUBDIRS = . tests
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+# GCC 4.4 emits warning about breaking strict aliasing rule.
+# This warning is a result of a GCC bug:
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41874
+# The warning is raised in the generated code in parser.h.
+# Disabling the strict aliasing rule suppresses this warning.
+AM_CXXFLAGS += $(WARNING_GCC_44_STRICT_ALIASING_CFLAG)
+
+lib_LTLIBRARIES = libkea-eval.la
+libkea_eval_la_SOURCES  =
+libkea_eval_la_SOURCES += dependency.cc dependency.h
+libkea_eval_la_SOURCES += eval_log.cc eval_log.h
+libkea_eval_la_SOURCES += evaluate.cc evaluate.h
+libkea_eval_la_SOURCES += token.cc token.h
+
+libkea_eval_la_SOURCES += parser.cc parser.h
+libkea_eval_la_SOURCES += lexer.cc
+libkea_eval_la_SOURCES += location.hh
+libkea_eval_la_SOURCES += eval_context.cc eval_context.h eval_context_decl.h
+libkea_eval_la_SOURCES += eval_messages.h eval_messages.cc
+
+libkea_eval_la_CXXFLAGS = $(AM_CXXFLAGS)
+libkea_eval_la_CPPFLAGS = $(AM_CPPFLAGS)
+libkea_eval_la_LIBADD  = $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libkea_eval_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libkea_eval_la_LIBADD += $(LOG4CPLUS_LIBS) $(CRYPTO_LIBS) $(BOOST_LIBS)
+
+libkea_eval_la_LDFLAGS  = -no-undefined -version-info 52:0:0
+libkea_eval_la_LDFLAGS += $(CRYPTO_LDFLAGS)
+
+EXTRA_DIST  = eval.dox
+EXTRA_DIST += eval_messages.mes
+EXTRA_DIST += lexer.ll parser.yy
+
+CLEANFILES = *.gcno *.gcda
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean:
+	rm -f eval_messages.h eval_messages.cc
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: eval_messages.h eval_messages.cc
+	@echo Message files regenerated
+
+eval_messages.h eval_messages.cc: eval_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/lib/eval/eval_messages.mes
+
+else
+
+messages eval_messages.h eval_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+#
+# If we want to get rid of all flex/bison generated files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required. To make it easy to rebuild flex/bison without going through
+# reconfigure, a new target parser-clean has been added.
+maintainer-clean-local:
+	rm -f eval_messages.h eval_messages.cc
+	rm -f location.hh lexer.cc parser.cc parser.h
+
+# To regenerate flex/bison files, one can do:
+#
+# make parser-clean
+# make parser
+#
+# This is needed only when the lexer.ll or parser.yy files are modified.
+# Make sure you have both flex and bison installed.
+parser-clean:
+	rm -f location.hh lexer.cc parser.cc parser.h
+
+if GENERATE_PARSER
+
+# Generate parser first.
+all-recursive: lexer.cc location.hh parser.cc parser.h
+
+parser: lexer.cc location.hh parser.cc parser.h
+	@echo "Flex/bison files regenerated"
+
+# --- Flex/Bison stuff below --------------------------------------------------
+# When debugging grammar issues, it's useful to add -v to bison parameters.
+# bison will generate parser.output file that explains the whole grammar.
+# It can be used to manually follow what's going on in the parser.
+# This is especially useful if yydebug_ is set to 1 as that variable
+# will cause parser to print out its internal state.
+location.hh parser.cc parser.h: parser.yy
+	$(YACC) -Wno-yacc --defines=parser.h -o parser.cc parser.yy
+
+lexer.cc: lexer.ll
+	$(LEX) --prefix eval -o lexer.cc lexer.ll
+
+else
+
+parser location.hh parser.cc parser.h lexer.cc:
+	@echo Parser generation disabled. Configure with --enable-generate-parser to enable it.
+
+endif
+
+
+# Specify the headers for copying into the installation directory tree.
+libkea_eval_includedir = $(pkgincludedir)/eval
+libkea_eval_include_HEADERS = \
+	dependency.h \
+	eval_context.h \
+	eval_context_decl.h \
+	eval_log.h \
+	eval_messages.h \
+	evaluate.h \
+	parser.h \
+	token.h
+# does not include *.hh generated headers as they come with lexer and parser.
diff --git a/src/lib/eval/Makefile.in b/src/lib/eval/Makefile.in
new file mode 100644
index 0000000..6b8edb5
--- /dev/null
+++ b/src/lib/eval/Makefile.in
@@ -0,0 +1,1134 @@
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+
+# Generate parser first.
+@GENERATE_PARSER_TRUE@all-recursive: lexer.cc location.hh parser.cc parser.h
+
+@GENERATE_PARSER_TRUE@parser: lexer.cc location.hh parser.cc parser.h
+@GENERATE_PARSER_TRUE@	@echo "Flex/bison files regenerated"
+
+# --- Flex/Bison stuff below --------------------------------------------------
+# When debugging grammar issues, it's useful to add -v to bison parameters.
+# bison will generate parser.output file that explains the whole grammar.
+# It can be used to manually follow what's going on in the parser.
+# This is especially useful if yydebug_ is set to 1 as that variable
+# will cause parser to print out its internal state.
+@GENERATE_PARSER_TRUE@location.hh parser.cc parser.h: parser.yy
+@GENERATE_PARSER_TRUE@	$(YACC) -Wno-yacc --defines=parser.h -o parser.cc parser.yy
+
+@GENERATE_PARSER_TRUE@lexer.cc: lexer.ll
+@GENERATE_PARSER_TRUE@	$(LEX) --prefix eval -o lexer.cc lexer.ll
+
+@GENERATE_PARSER_FALSE@parser location.hh parser.cc parser.h lexer.cc:
+@GENERATE_PARSER_FALSE@	@echo Parser generation disabled. Configure with --enable-generate-parser to enable it.
+# does not include *.hh generated headers as they come with lexer and parser.
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/eval/dependency.cc b/src/lib/eval/dependency.cc
new file mode 100644
index 0000000..66e3600
--- /dev/null
+++ b/src/lib/eval/dependency.cc
@@ -0,0 +1,37 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <eval/dependency.h>
+#include <boost/pointer_cast.hpp>
+
+namespace isc {
+namespace dhcp {
+
+bool dependOnClass(const TokenPtr& token, const std::string& name) {
+    boost::shared_ptr<TokenMember> member;
+    member = boost::dynamic_pointer_cast<TokenMember>(token);
+    if (!member) {
+        return (false);
+    }
+    return (member->getClientClass() == name);
+}
+
+bool dependOnClass(const ExpressionPtr& expr, const std::string& name) {
+    if (!expr) {
+        return (false);
+    }
+    for (auto it = expr->cbegin(); it != expr->cend(); ++it) {
+        if (dependOnClass(*it, name)) {
+            return (true);
+        }
+    }
+    return (false);
+}
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
diff --git a/src/lib/eval/dependency.h b/src/lib/eval/dependency.h
new file mode 100644
index 0000000..001bed7
--- /dev/null
+++ b/src/lib/eval/dependency.h
@@ -0,0 +1,37 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef DEPENDENCY_H
+#define DEPENDENCY_H
+
+#include <eval/token.h>
+#include <string>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Checks dependency on a token.
+///
+/// It checks if the token is a TokenMember for the given class.
+///
+/// @param token A pointer to the token.
+/// @param name The client class name.
+/// @return true if token points to a TokenMember of name, false if not.
+bool dependOnClass(const TokenPtr& token, const std::string& name);
+
+/// @brief Checks dependency on an expression.
+///
+/// It checks if a member of the expression depends on the given class.
+///
+/// @param expr An expression.
+/// @param name The client class name.
+/// @return true if a member of expr depends on name, false if not.
+bool dependOnClass(const ExpressionPtr& expr, const std::string& name);
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
+
+#endif
diff --git a/src/lib/eval/eval.dox b/src/lib/eval/eval.dox
new file mode 100644
index 0000000..e728006
--- /dev/null
+++ b/src/lib/eval/eval.dox
@@ -0,0 +1,198 @@
+// Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/**
+  @page libeval libkea-eval - Expression Evaluation and Client Classification Library
+
+  @section dhcpEvalIntroduction Introduction
+
+  The core of the libeval library is a parser that is able to parse an
+  expression (e.g. option[123].text == 'APC'). This is currently used for
+  client classification, but in the future may be also used for other
+  applications.
+
+  The external interface to the library is the @ref isc::eval::EvalContext
+  class.  Once instantiated, it offers a major method:
+  @ref isc::eval::EvalContext::parseString, which parses the specified
+  string.  Once the expression is parsed, it is converted to a collection of
+  tokens that are stored in Reverse Polish Notation in
+  EvalContext::expression.
+
+  Parameters to the @ref isc::eval::EvalContext class constructor are
+  the universe to choose between DHCPv4 and DHCPv6 for DHCP version
+  dependent expressions, and a function used
+  by the parser to accept only already defined or built-in client
+  class names in client class membership expressions. This function defaults
+  to accept all client class names.
+
+  Internally, the parser code is generated by flex and bison. These two
+  tools convert lexer.ll and parser.yy files into a number of .cc and .hh files.
+  To avoid a build of Kea depending on the presence of flex and bison, the
+  result of the generation is checked into the github repository and is
+  distributed in the tarballs.
+
+  @section dhcpEvalLexer Lexer generation using flex
+
+  Flex is used to generate the lexer, a piece of code that converts input
+  data into a series of tokens. It contains a small number of directives,
+  but the majority of the code consists of the definitions of tokens. These
+  definitions are regular expressions that define various tokens, e.g. strings,
+  numbers, parentheses, etc. Once the expression is matched, the associated
+  action is executed. In the majority of the cases a generator method from
+  @ref isc::eval::EvalParser is called, which returns returns a newly created
+  bison token. The purpose of the lexer is to generate a stream
+  of tokens that are consumed by the parser.
+
+  lexer.cc and lexer.hh must not be edited. If there is a need
+  to introduce changes, lexer.ll must be updated and the .cc and .hh files
+  regenerated.
+
+  @section dhcpEvalParser Parser generation using bison
+
+  Bison is used to generate the parser, a piece of code that consumes a
+  stream of tokens and attempts to match it against a defined grammar.
+  The bison parser is created from parser.yy. It contains
+  a number of directives, but the two most important sections are:
+  a list of tokens (for each token defined here, bison will generate the
+  make_NAMEOFTOKEN method in the @ref isc::eval::EvalParser class) and
+  the grammar. The Grammar is a tree like structure with possible loops.
+
+  Here is an over-simplified version of the grammar:
+
+@code
+01. %start expression;
+02.
+03. expression : token EQUAL token
+04.            | token
+05.            ;
+06.
+07. token : STRING
+08.             {
+09.                 TokenPtr str(new TokenString($1));
+10.                 ctx.expression.push_back(str);
+11.             }
+12.       | HEXSTRING
+13.             {
+14.                 TokenPtr hex(new TokenHexString($1));
+15.                 ctx.expression.push_back(hex);
+16.             }
+17.       | OPTION '[' INTEGER ']' DOT TEXT
+18.             {
+19.                 TokenPtr opt(new TokenOption($3, TokenOption::TEXTUAL));
+20.                 ctx.expression.push_back(opt);
+21.             }
+22.       | OPTION '[' INTEGER ']' DOT HEX
+23.             {
+24.                 TokenPtr opt(new TokenOption($3, TokenOption::HEXADECIMAL));
+25.                 ctx.expression.push_back(opt);
+26.              }
+27.       ;
+@endcode
+
+This code determines that the grammar starts from expression (line 1).
+The actual definition of expression (lines 3-5) may either be a
+single token or an expression "token == token" (EQUAL has been defined as
+"==" elsewhere). Token is further
+defined in lines 7-22: it may either be a string (lines 7-11),
+a hex string (lines 12-16), option in the textual format (lines 17-21)
+or option in a hexadecimal format (lines 22-26).
+When the actual case is determined, the respective C++ action
+is executed. For example, if the token is a string, the TokenString class is
+instantiated with the appropriate value and put onto the expression vector.
+
+@section dhcpEvalMakefile Generating parser files
+
+ In the general case, we want to avoid generating parser files, so an
+ average user interested in just compiling Kea would not need flex or
+ bison. Therefore the generated files are already included in the
+ git repository and will be included in the tarball releases.
+
+ However, there will be cases when one of the developers would want
+ to tweak the lexer.ll and parser.yy files and then regenerate
+ the code. For this purpose, two makefile targets are defined:
+ @code
+ make parser
+ @endcode
+ will generate the parsers and
+ @code
+ make parser-clean
+ @endcode
+ will remove the files. Generated files removal was also hooked
+ into the maintainer-clean target.
+
+@section dhcpEvalConfigure Configure options
+
+ Since the flex/bison tools are not necessary for a regular compilation,
+ checks are conducted during the configure script, but the lack of flex or
+ bison tools does not stop the process. There is a flag
+ (--enable-generate-parser) that tells configure script that the
+ parser will be generated. With this flag, the checks for flex/bison
+ are mandatory. If either tool is missing or at too early a version, the
+ configure process will terminate with an error.
+
+@section dhcpEvalToken Supported tokens
+
+ There are a number of tokens implemented. Each token is derived from
+ isc::eval::Token class and represents a certain expression primitive.
+ Currently supported tokens are:
+
+ - isc::dhcp::TokenString -- represents a constant string, e.g. "MSFT".
+ - isc::dhcp::TokenHexString -- represents a constant string, encoded as
+   hex string, e.g. 0x666f6f which is actually "foo".
+ - isc::dhcp::TokenIpAddress -- represents a constant IP address, encoded as
+   a 4 or 16 byte binary string, e.g., 10.0.0.1 is 0x10000001.
+ - isc::dhcp::TokenIpAddressToText -- represents an IP address in text format.
+ - isc::dhcp::TokenOption -- represents an option in a packet, e.g.
+                    option[123].text.
+ - isc::dhcp::TokenRelay4Option -- represents a sub-option inserted by the
+                    DHCPv4 relay, e.g. relay[123].text or relay[123].hex
+ - isc::dhcp::TokenRelay6Option -- represents a sub-option inserted by
+   a DHCPv6 relay
+ - isc::dhcp::TokenPkt -- represents a DHCP packet meta data (incoming
+   interface name, source/remote or destination/local IP address, length).
+ - isc::dhcp::TokenPkt4 -- represents a DHCPv4 packet field.
+ - isc::dhcp::TokenPkt6 -- represents a DHCPv6 packet field (message type
+   or transaction id).
+ - isc::dhcp::TokenRelay6Field -- represents a DHCPv6 relay information field.
+ - isc::dhcp::TokenEqual -- represents the equal (==) operator.
+ - isc::dhcp::TokenSubstring -- represents the substring(text, start, length) operator.
+ - isc::dhcp::TokenConcat -- represents the concat operator which
+   concatenate two other tokens.
+ - isc::dhcp::TokenIfElse -- represents the ifelse(cond, iftrue, ifelse) operator.
+ - isc::dhcp::TokenToHexString -- represents the hexstring operator which
+   converts a binary value to its hexadecimal string representation.
+ - isc::dhcp::TokenInt8ToText -- represents the signed 8 bit integer in string
+   representation.
+ - isc::dhcp::TokenInt16ToText -- represents the signed 16 bit integer in string
+   representation.
+ - isc::dhcp::TokenInt32ToText -- represents the signed 32 bit integer in string
+   representation.
+ - isc::dhcp::TokenUInt8ToText -- represents the unsigned 8 bit integer in string
+   representation.
+ - isc::dhcp::TokenUInt16ToText -- represents the unsigned 16 bit integer in string
+   representation.
+ - isc::dhcp::TokenUInt32ToText -- represents the unsigned 32 bit integer in string
+   representation.
+ - isc::dhcp::TokenNot -- the logical not operator.
+ - isc::dhcp::TokenAnd -- the logical and (strict) operator.
+ - isc::dhcp::TokenOr -- the logical or (strict) operator (strict means
+   it always evaluates its operands).
+ - isc::dhcp::TokenVendor -- represents vendor information option's existence,
+   enterprise-id field and possible sub-options. (e.g. vendor[1234].exists,
+   vendor[*].enterprise-id, vendor[1234].option[1].exists, vendor[1234].option[1].hex)
+ - isc::dhcp::TokenVendorClass -- represents vendor information option's existence,
+   enterprise-id and included data chunks. (e.g. vendor-class[1234].exists,
+   vendor-class[*].enterprise-id, vendor-class[*].data[3])
+
+More operators are expected to be implemented in upcoming releases.
+
+@section dhcpEvalMTConsiderations Multi-Threading Consideration for Expression Evaluation Library
+
+This library is not thread safe, for instance @ref isc::dhcp::evaluateBool
+or @ref isc::dhcp::evaluateString must not be called in different threads
+on the same packet.
+
+*/
diff --git a/src/lib/eval/eval_context.cc b/src/lib/eval/eval_context.cc
new file mode 100644
index 0000000..d91fbb0
--- /dev/null
+++ b/src/lib/eval/eval_context.cc
@@ -0,0 +1,260 @@
+// Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <dhcp/dhcp6.h>
+#include <dhcp/option.h>
+#include <dhcp/option_definition.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/option_space.h>
+#include <eval/eval_context.h>
+#include <eval/parser.h>
+#include <exceptions/exceptions.h>
+#include <boost/lexical_cast.hpp>
+#include <fstream>
+#include <limits>
+
+EvalContext::EvalContext(const Option::Universe& option_universe,
+                         CheckDefined check_defined)
+    : trace_scanning_(false), trace_parsing_(false),
+      option_universe_(option_universe), check_defined_(check_defined)
+{
+}
+
+EvalContext::~EvalContext() {
+}
+
+bool
+EvalContext::acceptAll(const ClientClass&) {
+    return (true);
+}
+
+bool
+EvalContext::parseString(const std::string& str, ParserType type) {
+    file_ = "<string>";
+    string_ = str;
+    scanStringBegin(type);
+    int res = -1;
+    try {
+        isc::eval::EvalParser parser(*this);
+        parser.set_debug_level(trace_parsing_);
+        res = parser.parse();
+    } catch (...) {
+        scanStringEnd();
+        throw;
+    }
+    scanStringEnd();
+    return (res == 0);
+}
+
+void
+EvalContext::error(const isc::eval::location& loc, const std::string& what) {
+    isc_throw(EvalParseError, loc << ": " << what);
+}
+
+void
+EvalContext::error (const std::string& what) {
+    isc_throw(EvalParseError, what);
+}
+
+uint16_t
+EvalContext::convertOptionCode(const std::string& option_code,
+                               const isc::eval::location& loc) {
+    int n = 0;
+    try {
+        n  = boost::lexical_cast<int>(option_code);
+    } catch (const boost::bad_lexical_cast &) {
+        // This can't happen...
+        error(loc, "Option code has invalid value in " + option_code);
+    }
+    if (option_universe_ == Option::V6) {
+        if (n < 0 || n > 65535) {
+            error(loc, "Option code has invalid value in "
+                      + option_code + ". Allowed range: 0..65535");
+        }
+    } else {
+        if (n < 0 || n > 255) {
+            error(loc, "Option code has invalid value in "
+                      + option_code + ". Allowed range: 0..255");
+        }
+    }
+    return (static_cast<uint16_t>(n));
+}
+
+uint16_t
+EvalContext::convertOptionName(const std::string& option_name,
+                               const isc::eval::location& loc) {
+    const std::string global_space = (option_universe_ == Option::V4) ?
+        DHCP4_OPTION_SPACE : DHCP6_OPTION_SPACE;
+
+    OptionDefinitionPtr option_def = LibDHCP::getOptionDef(global_space,
+                                                           option_name);
+    if (!option_def) {
+        option_def = LibDHCP::getRuntimeOptionDef(global_space, option_name);
+    }
+
+    if (!option_def) {
+        option_def = LibDHCP::getLastResortOptionDef(global_space, option_name);
+    }
+
+    if (!option_def) {
+        error(loc, "option '" + option_name + "' is not defined");
+    }
+
+    return (option_def->getCode());
+}
+
+int8_t
+EvalContext::convertNestLevelNumber(const std::string& nest_level,
+                                    const isc::eval::location& loc) {
+    int8_t n = convertInt8(nest_level, loc);
+    if (option_universe_ == Option::V6) {
+        if ((n < - HOP_COUNT_LIMIT) || (n >= HOP_COUNT_LIMIT)) {
+            error(loc, "Nest level has invalid value in "
+                      + nest_level + ". Allowed range: -32..31");
+        }
+    } else {
+        error(loc, "Nest level invalid for DHCPv4 packets");
+    }
+
+    return (n);
+}
+
+uint8_t
+EvalContext::convertUint8(const std::string& number,
+                          const isc::eval::location& loc) {
+    int64_t n = 0;
+    try {
+        n = boost::lexical_cast<int64_t>(number);
+    } catch (const boost::bad_lexical_cast &) {
+        error(loc, "Invalid integer value in " + number);
+    }
+    if (n < 0 || n > std::numeric_limits<uint8_t>::max()) {
+        error(loc, "Invalid value in "
+              + number + ". Allowed range: 0..255");
+    }
+
+    return (static_cast<uint8_t>(n));
+}
+
+int8_t
+EvalContext::convertInt8(const std::string& number,
+                         const isc::eval::location& loc) {
+    int64_t n = 0;
+    try {
+        n = boost::lexical_cast<int64_t>(number);
+    } catch (const boost::bad_lexical_cast &) {
+        error(loc, "Invalid integer value in " + number);
+    }
+    if (n < std::numeric_limits<int8_t>::min() ||
+        n > std::numeric_limits<int8_t>::max()) {
+        error(loc, "Invalid value in "
+              + number + ". Allowed range: -128..127");
+    }
+
+    return (static_cast<int8_t>(n));
+}
+
+uint16_t
+EvalContext::convertUint16(const std::string& number,
+                           const isc::eval::location& loc) {
+    int64_t n = 0;
+    try {
+        n = boost::lexical_cast<int64_t>(number);
+    } catch (const boost::bad_lexical_cast &) {
+        error(loc, "Invalid value in " + number);
+    }
+    if (n < 0 || n > std::numeric_limits<uint16_t>::max()) {
+        error(loc, "Invalid value in "
+              + number + ". Allowed range: 0..65535");
+    }
+
+    return (static_cast<uint16_t>(n));
+}
+
+int16_t
+EvalContext::convertInt16(const std::string& number,
+                          const isc::eval::location& loc) {
+    uint64_t n = 0;
+    try {
+        n = boost::lexical_cast<int64_t>(number);
+    } catch (const boost::bad_lexical_cast &) {
+        error(loc, "Invalid value in " + number);
+    }
+    if (n > std::numeric_limits<int16_t>::max() ||
+        n < std::numeric_limits<int16_t>::max()) {
+        error(loc, "Invalid value in "
+              + number + ". Allowed range: -32768..32767");
+    }
+
+    return (static_cast<int16_t>(n));
+}
+
+uint32_t
+EvalContext::convertUint32(const std::string& number,
+                           const isc::eval::location& loc) {
+    int64_t n = 0;
+    try {
+        n = boost::lexical_cast<int64_t>(number);
+    } catch (const boost::bad_lexical_cast &) {
+        error(loc, "Invalid value in " + number);
+    }
+    if (n < 0 || n > std::numeric_limits<uint32_t>::max()) {
+        error(loc, "Invalid value in "
+              + number + ". Allowed range: 0..4294967295");
+    }
+
+    return (static_cast<uint32_t>(n));
+}
+
+int32_t
+EvalContext::convertInt32(const std::string& number,
+                          const isc::eval::location& loc) {
+    int64_t n = 0;
+    try {
+        n = boost::lexical_cast<int64_t>(number);
+    } catch (const boost::bad_lexical_cast &) {
+        error(loc, "Invalid value in " + number);
+    }
+    if (n > std::numeric_limits<int32_t>::max() ||
+        n < std::numeric_limits<int32_t>::max()) {
+        error(loc, "Invalid value in "
+              + number + ". Allowed range: -2147483648..2147483647");
+    }
+
+    return (static_cast<int32_t>(n));
+}
+
+std::string
+EvalContext::fromUint32(const uint32_t integer) {
+    std::string tmp(4, 0);
+    tmp[0] = (integer >> 24) & 0xff;
+    tmp[1] = (integer >> 16) & 0xff;
+    tmp[2] = (integer >> 8) & 0xff;
+    tmp[3] = integer & 0xff;
+
+    return (tmp);
+}
+
+std::string
+EvalContext::fromUint16(const uint16_t integer) {
+    std::string tmp(2, 0);
+    tmp[0] = (integer >> 8) & 0xff;
+    tmp[1] = integer & 0xff;
+
+    return (tmp);
+}
+
+bool
+EvalContext::isClientClassDefined(const ClientClass& client_class) {
+    return (check_defined_(client_class));
+}
+
+void
+EvalContext::fatal(const std::string& what) {
+    isc_throw(Unexpected, what);
+}
diff --git a/src/lib/eval/eval_context.h b/src/lib/eval/eval_context.h
new file mode 100644
index 0000000..8050925
--- /dev/null
+++ b/src/lib/eval/eval_context.h
@@ -0,0 +1,249 @@
+// Copyright (C) 2015-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EVAL_CONTEXT_H
+#define EVAL_CONTEXT_H
+#include <string>
+#include <map>
+#include <eval/parser.h>
+#include <eval/eval_context_decl.h>
+#include <exceptions/exceptions.h>
+
+// Tell Flex the lexer's prototype ...
+#define YY_DECL \
+    isc::eval::EvalParser::symbol_type evallex (EvalContext& driver)
+
+// ... and declare it for the parser's sake.
+YY_DECL;
+
+namespace isc {
+namespace eval {
+
+/// @brief Evaluation error exception raised when trying to parse an exceptions.
+class EvalParseError : public isc::Exception {
+public:
+    EvalParseError(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+
+/// @brief Evaluation context, an interface to the expression evaluation.
+class EvalContext {
+public:
+
+    /// @brief Specifies what type of expression the parser is expected to see
+    typedef enum {
+        PARSER_BOOL,  ///< expression is expected to evaluate to bool
+        PARSER_STRING ///< expression is expected to evaluate to string
+    } ParserType;
+
+    /// @brief Type of the check defined function.
+    typedef std::function<bool(const ClientClass&)> CheckDefined;
+
+    /// @brief Default constructor.
+    ///
+    /// @param option_universe Option universe: DHCPv4 or DHCPv6. This is used
+    /// by the parser to determine which option definitions set should be used
+    /// to map option names to option codes.
+    /// @param check_defined A function called to check if a client class
+    /// used for membership is already defined. If it is not the parser
+    /// will fail: only backward or built-in references are accepted.
+    EvalContext(const Option::Universe& option_universe,
+                CheckDefined check_defined = acceptAll);
+
+    /// @brief destructor
+    virtual ~EvalContext();
+
+    /// @brief Accept all client class names
+    ///
+    /// @param client_class (unused)
+    /// @return true
+    static bool acceptAll(const ClientClass& client_class);
+
+    /// @brief Parsed expression (output tokens are stored here)
+    isc::dhcp::Expression expression;
+
+    /// @brief Method called before scanning starts on a string.
+    ///
+    /// @param type specifies type of the expression to be parsed
+    void scanStringBegin(ParserType type);
+
+    /// @brief Method called after the last tokens are scanned from a string.
+    void scanStringEnd();
+
+    /// @brief Run the parser on the string specified.
+    ///
+    /// @param str string to be parsed
+    /// @param type type of the expression expected/parser type to be created
+    /// @return true on success.
+    bool parseString(const std::string& str, ParserType type = PARSER_BOOL);
+
+    /// @brief The name of the file being parsed.
+    /// Used later to pass the file name to the location tracker.
+    std::string file_;
+
+    /// @brief The string being parsed.
+    std::string string_;
+
+    /// @brief Error handler
+    ///
+    /// @param loc location within the parsed file where the problem was experienced.
+    /// @param what string explaining the nature of the error.
+    static void error(const isc::eval::location& loc, const std::string& what);
+
+    /// @brief Error handler
+    ///
+    /// This is a simplified error reporting tool for possible future
+    /// cases when the EvalParser is not able to handle the packet.
+    static void error(const std::string& what);
+
+    /// @brief Fatal error handler
+    ///
+    /// This is for should not happen but fatal errors
+    static void fatal(const std::string& what);
+
+    /// @brief Option code conversion
+    ///
+    /// @param option_code a string representing the integer code
+    /// @param loc the location of the token
+    /// @result the option code
+    /// @throw calls the syntax error function if the value is not in
+    ///        the range 0..255 or 0..65535
+    uint16_t convertOptionCode(const std::string& option_code,
+                               const isc::eval::location& loc);
+
+    /// @brief Option name conversion
+    ///
+    /// @param option_name the option name
+    /// @param loc the location of the token
+    /// @return the option code
+    /// @throw calls the syntax error function if the name cannot be resolved
+    uint16_t convertOptionName(const std::string& option_name,
+                               const isc::eval::location& loc);
+
+    /// @brief Attempts to convert string to unsigned 32bit integer
+    ///
+    /// For reverse conversion, see @ref fromUint32
+    ///
+    /// @param number string to be converted
+    /// @param loc the location of the token
+    /// @return the integer value
+    /// @throw EvalParseError if conversion fails or the value is out of range.
+    static uint32_t convertUint32(const std::string& number,
+                                  const isc::eval::location& loc);
+
+    /// @brief Attempts to convert string to signed 32bit integer
+    ///
+    /// @param number string to be converted
+    /// @param loc the location of the token
+    /// @return the integer value
+    /// @throw EvalParseError if conversion fails or the value is out of range.
+    static int32_t convertInt32(const std::string& number,
+                                const isc::eval::location& loc);
+
+    /// @brief Attempts to convert string to unsigned 16bit integer
+    ///
+    /// For reverse conversion, see @ref fromUint16
+    ///
+    /// @param number string to be converted
+    /// @param loc the location of the token
+    /// @return the integer value
+    /// @throw EvalParseError if conversion fails or the value is out of range.
+    static uint16_t convertUint16(const std::string& number,
+                                  const isc::eval::location& loc);
+
+    /// @brief Attempts to convert string to signed 16bit integer
+    ///
+    /// @param number string to be converted
+    /// @param loc the location of the token
+    /// @return the integer value
+    /// @throw EvalParseError if conversion fails or the value is out of range.
+    static int16_t convertInt16(const std::string& number,
+                                const isc::eval::location& loc);
+
+    /// @brief Attempts to convert string to unsigned 8bit integer
+    ///
+    /// @param number string to be converted
+    /// @param loc the location of the token
+    /// @return the integer value
+    /// @throw EvalParseError if conversion fails or the value is out of range.
+    static uint8_t convertUint8(const std::string& number,
+                                const isc::eval::location& loc);
+
+    /// @brief Attempts to convert string to signed 8bit integer
+    ///
+    /// @param number string to be converted
+    /// @param loc the location of the token
+    /// @return the integer value
+    /// @throw EvalParseError if conversion fails or the value is out of range.
+    static int8_t convertInt8(const std::string& number,
+                              const isc::eval::location& loc);
+
+    /// @brief Nest level conversion
+    ///
+    /// @param nest_level a string representing the integer nesting level
+    /// @param loc the location of the token
+    /// @return the nesting level
+    /// @throw calls the syntax error function if the value is not in
+    ///        the range -32..31
+    int8_t convertNestLevelNumber(const std::string& nest_level,
+                                  const isc::eval::location& loc);
+
+    /// @brief Converts unsigned 32bit integer to string representation
+    ///
+    /// The integer is coded as a 4 byte long string in network order, e.g.
+    /// 6 is represented as 00000006. For reverse conversion, see
+    /// @ref convertUint32.
+    ///
+    /// @param integer value to be converted
+    /// @return 4 byte long string that encodes the value.
+    static std::string fromUint32(const uint32_t integer);
+
+    /// @brief Converts unsigned 16bit integer to string representation
+    ///
+    /// The integer is coded as a 2 byte long string in network order, e.g.
+    /// 6 is represented as 0006. For reverse conversion, see
+    /// @ref convertUint16.
+    ///
+    /// @param integer value to be converted
+    /// @return 2 byte long string that encodes the value.
+    static std::string fromUint16(const uint16_t integer);
+
+    /// @brief Returns the universe (v4 or v6)
+    ///
+    /// @return universe
+    Option::Universe getUniverse() {
+        return (option_universe_);
+    }
+
+    /// @brief Check if a client class is already defined
+    ///
+    /// @param client_class the client class name to check
+    /// @return true if the client class is defined, false if not
+    bool isClientClassDefined(const ClientClass& client_class);
+
+private:
+    /// @brief Flag determining scanner debugging.
+    bool trace_scanning_;
+
+    /// @brief Flag determining parser debugging.
+    bool trace_parsing_;
+
+    /// @brief Option universe: DHCPv4 or DHCPv6.
+    ///
+    /// This is used by the parser to determine which option definitions
+    /// set should be used to map option name to option code.
+    Option::Universe option_universe_;
+
+    /// @brief Function to check if a client class is already defined.
+    CheckDefined check_defined_;
+
+};
+
+} // end of isc::eval namespace
+} // end of isc namespace
+
+#endif
diff --git a/src/lib/eval/eval_context_decl.h b/src/lib/eval/eval_context_decl.h
new file mode 100644
index 0000000..c838011
--- /dev/null
+++ b/src/lib/eval/eval_context_decl.h
@@ -0,0 +1,20 @@
+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EVAL_CONTEXT_DECL_H
+#define EVAL_CONTEXT_DECL_H
+
+/// @file eval_context_decl.h Forward declaration of the EvalContext class
+
+namespace isc {
+namespace eval {
+
+class EvalContext;
+
+}; // end of isc::eval namespace
+}; // end of isc namespace
+
+#endif
diff --git a/src/lib/eval/eval_log.cc b/src/lib/eval/eval_log.cc
new file mode 100644
index 0000000..d9aeffa
--- /dev/null
+++ b/src/lib/eval/eval_log.cc
@@ -0,0 +1,23 @@
+// Copyright (C) 2015-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// Defines the logger used by the Eval (classification) code
+
+#include <config.h>
+
+#include <eval/eval_log.h>
+
+namespace isc {
+namespace dhcp {
+
+extern const int EVAL_DBG_TRACE = isc::log::DBGLVL_TRACE_BASIC;
+extern const int EVAL_DBG_STACK = isc::log::DBGLVL_TRACE_DETAIL_DATA;
+
+isc::log::Logger eval_logger("eval");
+
+} // namespace dhcp
+} // namespace isc
+
diff --git a/src/lib/eval/eval_log.h b/src/lib/eval/eval_log.h
new file mode 100644
index 0000000..5667025
--- /dev/null
+++ b/src/lib/eval/eval_log.h
@@ -0,0 +1,38 @@
+// Copyright (C) 2015-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EVAL_LOG_H
+#define EVAL_LOG_H
+
+#include <log/macros.h>
+#include <eval/eval_messages.h>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Eval debug Logging levels
+///
+/// Defines the levels used to output debug messages in the eval (classification) code.
+/// Note that higher numbers equate to more verbose (and detailed) output.
+
+// The first level traces normal operations,
+extern const int EVAL_DBG_TRACE;
+
+// Additional information on the calls.  Report the values that were
+// popped from or pushed to the value stack.
+extern const int EVAL_DBG_STACK;
+
+/// @brief Eval Logger
+///
+/// Define the logger used to log messages.  We could define it in multiple
+/// modules, but defining in a single module and linking to it saves time and
+/// space.
+extern isc::log::Logger eval_logger;
+
+} // namespace dhcp
+} // namespace isc
+
+#endif // EVAL_LOG_H
diff --git a/src/lib/eval/eval_messages.cc b/src/lib/eval/eval_messages.cc
new file mode 100644
index 0000000..7dfeba1
--- /dev/null
+++ b/src/lib/eval/eval_messages.cc
@@ -0,0 +1,113 @@
+// File created from ../../../src/lib/eval/eval_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+namespace isc {
+namespace dhcp {
+
+extern const isc::log::MessageID EVAL_DEBUG_AND = "EVAL_DEBUG_AND";
+extern const isc::log::MessageID EVAL_DEBUG_CONCAT = "EVAL_DEBUG_CONCAT";
+extern const isc::log::MessageID EVAL_DEBUG_EQUAL = "EVAL_DEBUG_EQUAL";
+extern const isc::log::MessageID EVAL_DEBUG_HEXSTRING = "EVAL_DEBUG_HEXSTRING";
+extern const isc::log::MessageID EVAL_DEBUG_IFELSE_FALSE = "EVAL_DEBUG_IFELSE_FALSE";
+extern const isc::log::MessageID EVAL_DEBUG_IFELSE_TRUE = "EVAL_DEBUG_IFELSE_TRUE";
+extern const isc::log::MessageID EVAL_DEBUG_INT16TOTEXT = "EVAL_DEBUG_INT16TOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_INT32TOTEXT = "EVAL_DEBUG_INT32TOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_INT8TOTEXT = "EVAL_DEBUG_INT8TOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_IPADDRESS = "EVAL_DEBUG_IPADDRESS";
+extern const isc::log::MessageID EVAL_DEBUG_IPADDRESSTOTEXT = "EVAL_DEBUG_IPADDRESSTOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_MEMBER = "EVAL_DEBUG_MEMBER";
+extern const isc::log::MessageID EVAL_DEBUG_NOT = "EVAL_DEBUG_NOT";
+extern const isc::log::MessageID EVAL_DEBUG_OPTION = "EVAL_DEBUG_OPTION";
+extern const isc::log::MessageID EVAL_DEBUG_OR = "EVAL_DEBUG_OR";
+extern const isc::log::MessageID EVAL_DEBUG_PKT = "EVAL_DEBUG_PKT";
+extern const isc::log::MessageID EVAL_DEBUG_PKT4 = "EVAL_DEBUG_PKT4";
+extern const isc::log::MessageID EVAL_DEBUG_PKT6 = "EVAL_DEBUG_PKT6";
+extern const isc::log::MessageID EVAL_DEBUG_RELAY6 = "EVAL_DEBUG_RELAY6";
+extern const isc::log::MessageID EVAL_DEBUG_RELAY6_RANGE = "EVAL_DEBUG_RELAY6_RANGE";
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT = "EVAL_DEBUG_SPLIT";
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT_DELIM_EMPTY = "EVAL_DEBUG_SPLIT_DELIM_EMPTY";
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT_EMPTY = "EVAL_DEBUG_SPLIT_EMPTY";
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE = "EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE";
+extern const isc::log::MessageID EVAL_DEBUG_STRING = "EVAL_DEBUG_STRING";
+extern const isc::log::MessageID EVAL_DEBUG_SUBSTRING = "EVAL_DEBUG_SUBSTRING";
+extern const isc::log::MessageID EVAL_DEBUG_SUBSTRING_EMPTY = "EVAL_DEBUG_SUBSTRING_EMPTY";
+extern const isc::log::MessageID EVAL_DEBUG_SUBSTRING_RANGE = "EVAL_DEBUG_SUBSTRING_RANGE";
+extern const isc::log::MessageID EVAL_DEBUG_SUB_OPTION = "EVAL_DEBUG_SUB_OPTION";
+extern const isc::log::MessageID EVAL_DEBUG_SUB_OPTION_NO_OPTION = "EVAL_DEBUG_SUB_OPTION_NO_OPTION";
+extern const isc::log::MessageID EVAL_DEBUG_TOHEXSTRING = "EVAL_DEBUG_TOHEXSTRING";
+extern const isc::log::MessageID EVAL_DEBUG_UINT16TOTEXT = "EVAL_DEBUG_UINT16TOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_UINT32TOTEXT = "EVAL_DEBUG_UINT32TOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_UINT8TOTEXT = "EVAL_DEBUG_UINT8TOTEXT";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_DATA = "EVAL_DEBUG_VENDOR_CLASS_DATA";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND = "EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID = "EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH = "EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_EXISTS = "EVAL_DEBUG_VENDOR_CLASS_EXISTS";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_NO_OPTION = "EVAL_DEBUG_VENDOR_CLASS_NO_OPTION";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_ENTERPRISE_ID = "EVAL_DEBUG_VENDOR_ENTERPRISE_ID";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH = "EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_EXISTS = "EVAL_DEBUG_VENDOR_EXISTS";
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_NO_OPTION = "EVAL_DEBUG_VENDOR_NO_OPTION";
+extern const isc::log::MessageID EVAL_RESULT = "EVAL_RESULT";
+
+} // namespace dhcp
+} // namespace isc
+
+namespace {
+
+const char* values[] = {
+    "EVAL_DEBUG_AND", "Popping %1 and %2 pushing %3",
+    "EVAL_DEBUG_CONCAT", "Popping %1 and %2 pushing %3",
+    "EVAL_DEBUG_EQUAL", "Popping %1 and %2 pushing result %3",
+    "EVAL_DEBUG_HEXSTRING", "Pushing hex string %1",
+    "EVAL_DEBUG_IFELSE_FALSE", "Popping %1 (false) and %2, leaving %3",
+    "EVAL_DEBUG_IFELSE_TRUE", "Popping %1 (true) and %2, leaving %3",
+    "EVAL_DEBUG_INT16TOTEXT", "Pushing Int16 %1",
+    "EVAL_DEBUG_INT32TOTEXT", "Pushing Int32 %1",
+    "EVAL_DEBUG_INT8TOTEXT", "Pushing Int8 %1",
+    "EVAL_DEBUG_IPADDRESS", "Pushing IPAddress %1",
+    "EVAL_DEBUG_IPADDRESSTOTEXT", "Pushing IPAddress %1",
+    "EVAL_DEBUG_MEMBER", "Checking membership of '%1', pushing result %2",
+    "EVAL_DEBUG_NOT", "Popping %1 pushing %2",
+    "EVAL_DEBUG_OPTION", "Pushing option %1 with value %2",
+    "EVAL_DEBUG_OR", "Popping %1 and %2 pushing %3",
+    "EVAL_DEBUG_PKT", "Pushing PKT meta data %1 with value %2",
+    "EVAL_DEBUG_PKT4", "Pushing PKT4 field %1 with value %2",
+    "EVAL_DEBUG_PKT6", "Pushing PKT6 field %1 with value %2",
+    "EVAL_DEBUG_RELAY6", "Pushing PKT6 relay field %1 nest %2 with value %3",
+    "EVAL_DEBUG_RELAY6_RANGE", "Pushing PKT6 relay field %1 nest %2 with value %3",
+    "EVAL_DEBUG_SPLIT", "Popping field %1, delimiters %2, string %3, pushing result %4",
+    "EVAL_DEBUG_SPLIT_DELIM_EMPTY", "Popping field %1, delimiters %2, string %3, pushing result %4",
+    "EVAL_DEBUG_SPLIT_EMPTY", "Popping field %1, delimiters %2, string %3, pushing result %4",
+    "EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE", "Popping field %1, delimiters %2, string %3, pushing result %4",
+    "EVAL_DEBUG_STRING", "Pushing text string %1",
+    "EVAL_DEBUG_SUBSTRING", "Popping length %1, start %2, string %3 pushing result %4",
+    "EVAL_DEBUG_SUBSTRING_EMPTY", "Popping length %1, start %2, string %3 pushing result %4",
+    "EVAL_DEBUG_SUBSTRING_RANGE", "Popping length %1, start %2, string %3 pushing result %4",
+    "EVAL_DEBUG_SUB_OPTION", "Pushing option %1 sub-option %2 with value %3",
+    "EVAL_DEBUG_SUB_OPTION_NO_OPTION", "Requested option %1 sub-option %2, but the parent option is not present, pushing result %3",
+    "EVAL_DEBUG_TOHEXSTRING", "Popping binary value %1 and separator %2, pushing result %3",
+    "EVAL_DEBUG_UINT16TOTEXT", "Pushing UInt16 %1",
+    "EVAL_DEBUG_UINT32TOTEXT", "Pushing UInt32 %1",
+    "EVAL_DEBUG_UINT8TOTEXT", "Pushing UInt8 %1",
+    "EVAL_DEBUG_VENDOR_CLASS_DATA", "Data %1 (out of %2 received) in vendor class found, pushing result '%3'",
+    "EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND", "Requested data index %1, but option with enterprise-id %2 has only %3 data tuple(s), pushing result '%4'",
+    "EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID", "Pushing enterprise-id %1 as result 0x%2",
+    "EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH", "Was looking for %1, option had %2, pushing result '%3'",
+    "EVAL_DEBUG_VENDOR_CLASS_EXISTS", "Option with enterprise-id %1 found, pushing result '%2'",
+    "EVAL_DEBUG_VENDOR_CLASS_NO_OPTION", "Option with code %1 missing, pushing result '%2'",
+    "EVAL_DEBUG_VENDOR_ENTERPRISE_ID", "Pushing enterprise-id %1 as result 0x%2",
+    "EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH", "Was looking for %1, option had %2, pushing result '%3'",
+    "EVAL_DEBUG_VENDOR_EXISTS", "Option with enterprise-id %1 found, pushing result '%2'",
+    "EVAL_DEBUG_VENDOR_NO_OPTION", "Option with code %1 missing, pushing result '%2'",
+    "EVAL_RESULT", "Expression %1 evaluated to %2",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/lib/eval/eval_messages.h b/src/lib/eval/eval_messages.h
new file mode 100644
index 0000000..6353ab2
--- /dev/null
+++ b/src/lib/eval/eval_messages.h
@@ -0,0 +1,60 @@
+// File created from ../../../src/lib/eval/eval_messages.mes
+
+#ifndef EVAL_MESSAGES_H
+#define EVAL_MESSAGES_H
+
+#include <log/message_types.h>
+
+namespace isc {
+namespace dhcp {
+
+extern const isc::log::MessageID EVAL_DEBUG_AND;
+extern const isc::log::MessageID EVAL_DEBUG_CONCAT;
+extern const isc::log::MessageID EVAL_DEBUG_EQUAL;
+extern const isc::log::MessageID EVAL_DEBUG_HEXSTRING;
+extern const isc::log::MessageID EVAL_DEBUG_IFELSE_FALSE;
+extern const isc::log::MessageID EVAL_DEBUG_IFELSE_TRUE;
+extern const isc::log::MessageID EVAL_DEBUG_INT16TOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_INT32TOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_INT8TOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_IPADDRESS;
+extern const isc::log::MessageID EVAL_DEBUG_IPADDRESSTOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_MEMBER;
+extern const isc::log::MessageID EVAL_DEBUG_NOT;
+extern const isc::log::MessageID EVAL_DEBUG_OPTION;
+extern const isc::log::MessageID EVAL_DEBUG_OR;
+extern const isc::log::MessageID EVAL_DEBUG_PKT;
+extern const isc::log::MessageID EVAL_DEBUG_PKT4;
+extern const isc::log::MessageID EVAL_DEBUG_PKT6;
+extern const isc::log::MessageID EVAL_DEBUG_RELAY6;
+extern const isc::log::MessageID EVAL_DEBUG_RELAY6_RANGE;
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT;
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT_DELIM_EMPTY;
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT_EMPTY;
+extern const isc::log::MessageID EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE;
+extern const isc::log::MessageID EVAL_DEBUG_STRING;
+extern const isc::log::MessageID EVAL_DEBUG_SUBSTRING;
+extern const isc::log::MessageID EVAL_DEBUG_SUBSTRING_EMPTY;
+extern const isc::log::MessageID EVAL_DEBUG_SUBSTRING_RANGE;
+extern const isc::log::MessageID EVAL_DEBUG_SUB_OPTION;
+extern const isc::log::MessageID EVAL_DEBUG_SUB_OPTION_NO_OPTION;
+extern const isc::log::MessageID EVAL_DEBUG_TOHEXSTRING;
+extern const isc::log::MessageID EVAL_DEBUG_UINT16TOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_UINT32TOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_UINT8TOTEXT;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_DATA;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_EXISTS;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_CLASS_NO_OPTION;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_ENTERPRISE_ID;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_EXISTS;
+extern const isc::log::MessageID EVAL_DEBUG_VENDOR_NO_OPTION;
+extern const isc::log::MessageID EVAL_RESULT;
+
+} // namespace dhcp
+} // namespace isc
+
+#endif // EVAL_MESSAGES_H
diff --git a/src/lib/eval/eval_messages.mes b/src/lib/eval/eval_messages.mes
new file mode 100644
index 0000000..1cace9a
--- /dev/null
+++ b/src/lib/eval/eval_messages.mes
@@ -0,0 +1,285 @@
+# Copyright (C) 2015-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+$NAMESPACE isc::dhcp
+
+
+# For use with TokenAnd
+% EVAL_DEBUG_AND Popping %1 and %2 pushing %3
+This debug message indicates that two values are popped from
+the value stack.  Then are then combined via logical and and
+the result is pushed onto the value stack.
+
+# For use with TokenConcat
+
+% EVAL_DEBUG_CONCAT Popping %1 and %2 pushing %3
+This debug message indicates that the two strings are being popped off
+of the stack.  They are then concatenated and the resulting string is
+pushed onto the stack.  The strings are displayed in hex.
+
+# For use with TokenEqual
+# Start with binary for the inputs for now, we may add text in the future.
+
+% EVAL_DEBUG_EQUAL Popping %1 and %2 pushing result %3
+This debug message indicates that the two strings are being popped off
+of the value stack and the result of comparing them is being pushed onto
+the value stack.  The strings are displayed in hex.
+
+# For use with TokenHexString
+
+% EVAL_DEBUG_HEXSTRING Pushing hex string %1
+This debug message indicates that the given binary string is being pushed
+onto the value stack.  The string is displayed in hex.
+
+# For use with TokenIfElse
+
+% EVAL_DEBUG_IFELSE_FALSE Popping %1 (false) and %2, leaving %3
+This debug message indicates that the condition is false so
+the iftrue branch value is removed and the ifelse branch value
+is left on the value stack.
+
+% EVAL_DEBUG_IFELSE_TRUE Popping %1 (true) and %2, leaving %3
+This debug message indicates that the condition is true so
+the ifelse branch value is removed and the iftrue branch value
+is left on the value stack.
+
+# For use with TokenIpAddress
+
+% EVAL_DEBUG_INT16TOTEXT Pushing Int16 %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents a 16 bit integer.
+
+# For use with TokenInt32ToText
+
+% EVAL_DEBUG_INT32TOTEXT Pushing Int32 %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents a 32 bit integer.
+
+# For use with TokenUInt8ToText
+
+% EVAL_DEBUG_INT8TOTEXT Pushing Int8 %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents an 8 bit integer.
+
+# For use with TokenInt16ToText
+
+% EVAL_DEBUG_IPADDRESS Pushing IPAddress %1
+This debug message indicates that the given binary string is being pushed
+onto the value stack.  This represents either an IPv4 or IPv6 address.
+The string is displayed in hex.
+
+# For use with TokenIpAddressToText
+
+% EVAL_DEBUG_IPADDRESSTOTEXT Pushing IPAddress %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents either an IPv4 or IPv6
+address.
+
+# For use with TokenInt8ToText
+
+% EVAL_DEBUG_MEMBER Checking membership of '%1', pushing result %2
+This debug message indicates that the membership of the packet for
+the client class was checked.
+
+# For use with TokenNot
+
+% EVAL_DEBUG_NOT Popping %1 pushing %2
+This debug message indicates that the first value is popped from
+the value stack, negated and then pushed onto the value stack.
+The string is displayed in text.
+
+# For use with TokenOption based classes.  These include TokenOption,
+# TokenRelay4Option and TokenRelay6Option.
+
+% EVAL_DEBUG_OPTION Pushing option %1 with value %2
+This debug message indicates that the given string representing the
+value of the requested option is being pushed onto the value stack.
+The string may be the text or binary value of the string based on the
+representation type requested (.text or .hex) or "true" or "false" if
+the requested type is .exists.  The option code may be for either an
+option or a sub-option as requested in the classification statement.
+
+# For use with TokenOr
+
+% EVAL_DEBUG_OR Popping %1 and %2 pushing %3
+This debug message indicates that two values are popped from
+the value stack.  Then are then combined via logical or and
+the result is pushed onto the value stack. The string is displayed
+in text.
+
+# For use with TokenPkt
+
+% EVAL_DEBUG_PKT Pushing PKT meta data %1 with value %2
+This debug message indicates that the given binary string representing
+the value of the requested meta data is being pushed onto the value stack.
+The string is displayed in hex at the exception of interface name.
+
+# For use with TokenPkt4
+
+% EVAL_DEBUG_PKT4 Pushing PKT4 field %1 with value %2
+This debug message indicates that the given binary string representing
+the value of the requested field is being pushed onto the value stack.
+The string is displayed in hex.
+
+# For use with TokenPkt6
+
+% EVAL_DEBUG_PKT6 Pushing PKT6 field %1 with value %2
+This debug message indicates that the given binary string representing
+the value of the requested field is being pushed onto the value stack.
+The string is displayed in hex.
+
+# For use with TokenRelay6Field
+
+% EVAL_DEBUG_RELAY6 Pushing PKT6 relay field %1 nest %2 with value %3
+This debug message indicates that the given binary string representing
+the value of the requested field is being pushed onto the value stack.
+The string is displayed in hex.
+
+% EVAL_DEBUG_RELAY6_RANGE Pushing PKT6 relay field %1 nest %2 with value %3
+This debug message is generated if the nest field is out of range.  The
+empty string will always be the value pushed onto the stack.
+
+# For use with TokenString
+
+% EVAL_DEBUG_SPLIT Popping field %1, delimiters %2, string %3, pushing result %4
+This debug message indicates that three values are being popped from the stack
+and a result is being pushed onto the stack. The values being popped are the
+field, delimiter and string. The result is the extracted field which is pushed
+onto the stack. The strings are displayed in hex.
+
+% EVAL_DEBUG_SPLIT_DELIM_EMPTY Popping field %1, delimiters %2, string %3, pushing result %4
+This debug message indicates that the delimiter popped from the stack was empty
+and so the result will be the entire string. The field, delimiter and string
+are still popped from the stack and the result is still pushed.
+
+% EVAL_DEBUG_SPLIT_EMPTY Popping field %1, delimiters %2, string %3, pushing result %4
+This debug message indicates that the string popped from the stack was empty
+and so the result will also be empty. The field, delimiter and string are
+still popped from the stack and the result is still pushed.
+
+% EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE Popping field %1, delimiters %2, string %3, pushing result %4
+This debug message indicates that the field is either less than one or larger
+than the number of fields in the string popped from the stack. The result will
+be empty. The field, delimiter and string are still popped from the stack and
+the result is still pushed.
+
+% EVAL_DEBUG_STRING Pushing text string %1
+This debug message indicates that the given text string is being pushed
+onto the value stack.  The string is displayed in text.
+
+# For use with TokenSubstring
+# Start with binary for the strings for now, we may add text in the future.
+
+% EVAL_DEBUG_SUBSTRING Popping length %1, start %2, string %3 pushing result %4
+This debug message indicates that three values are being popped from
+the value stack and a result is being pushed onto the value stack.  The
+values being popped are the starting point and length of a substring to
+extract from the given string.  The resulting string is pushed onto
+the stack.  The strings are displayed in hex.
+
+% EVAL_DEBUG_SUBSTRING_EMPTY Popping length %1, start %2, string %3 pushing result %4
+This debug message indicates that the string popped from the stack was empty
+and so the result will also be empty.  The start, length and string are
+still popped from the stack and the result is still pushed.
+
+% EVAL_DEBUG_SUBSTRING_RANGE Popping length %1, start %2, string %3 pushing result %4
+This debug message indicates that the value of start is outside of the
+string and an empty result will be pushed onto the stack.  The start,
+length and string are still popped from the stack and the result is
+still pushed.  The strings are displayed in hex.
+
+# For use with TokenSubOption
+
+% EVAL_DEBUG_SUB_OPTION Pushing option %1 sub-option %2 with value %3
+This debug message indicates that the given string representing the
+value of the requested sub-option of the requested parent option is
+being pushed onto the value stack. The string may be the text or
+binary value of the string based on the representation type requested
+(.text or .hex) or "true" or "false" if the requested type is .exists.
+The codes are the parent option and the sub-option codes as requested
+in the classification statement.
+
+% EVAL_DEBUG_SUB_OPTION_NO_OPTION Requested option %1 sub-option %2, but the parent option is not present, pushing result %3
+This debug message indicates that the parent option was not found.
+The codes are the parent option and the sub-option codes as requested
+in the classification statement.
+
+# For use with TokenToHexString
+
+% EVAL_DEBUG_TOHEXSTRING Popping binary value %1 and separator %2, pushing result %3
+This debug message indicates that two values are being popped from
+the value stack and a result is being pushed onto the value stack.
+The values being popped are the binary value to convert and the separator.
+The binary value is converted to its hexadecimal string representation
+and pushed onto the stack. The binary value is displayed in hex.
+
+% EVAL_DEBUG_UINT16TOTEXT Pushing UInt16 %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents a 16 bit unsigned integer.
+
+# For use with TokenUInt32ToText
+
+% EVAL_DEBUG_UINT32TOTEXT Pushing UInt32 %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents a 32 bit unsigned integer.
+
+# For use with TokenMember
+
+% EVAL_DEBUG_UINT8TOTEXT Pushing UInt8 %1
+This debug message indicates that the given address string representation is
+being pushed onto the value stack.  This represents an 8 bit unsigned integer.
+
+# For use with TokenUInt16ToText
+
+% EVAL_DEBUG_VENDOR_CLASS_DATA Data %1 (out of %2 received) in vendor class found, pushing result '%3'
+This debug message indicates that vendor class option was found and passed
+enterprise-id checks and has sufficient number of data chunks. The total number
+of chunks and value pushed are reported as debugging aid.
+
+% EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index %1, but option with enterprise-id %2 has only %3 data tuple(s), pushing result '%4'
+This debug message indicates that vendor class option was found and passed
+enterprise-id checks, but does not have sufficient number of data chunks.
+Note that the index starts at 0, so there has to be at least (index + 1)
+data chunks.
+
+% EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID Pushing enterprise-id %1 as result 0x%2
+This debug message indicates that the expression has been evaluated and vendor
+class option was found and its enterprise-id is being reported.
+
+% EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for %1, option had %2, pushing result '%3'
+This debug message indicates that the expression has been evaluated
+and vendor class option was found, but has different enterprise-id than specified
+in the expression.
+
+% EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id %1 found, pushing result '%2'
+This debug message indicates that the expression has been evaluated and vendor
+class option was found.
+
+% EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code %1 missing, pushing result '%2'
+This debug message indicates that the expression has been evaluated
+and vendor class option was not found.
+
+% EVAL_DEBUG_VENDOR_ENTERPRISE_ID Pushing enterprise-id %1 as result 0x%2
+This debug message indicates that the expression has been evaluated and vendor
+option was found and its enterprise-id is being reported.
+
+% EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for %1, option had %2, pushing result '%3'
+This debug message indicates that the expression has been evaluated
+and vendor option was found, but has different enterprise-id than specified
+in the expression.
+
+% EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id %1 found, pushing result '%2'
+This debug message indicates that the expression has been evaluated and vendor
+option was found.
+
+% EVAL_DEBUG_VENDOR_NO_OPTION Option with code %1 missing, pushing result '%2'
+This debug message indicates that the expression has been evaluated
+and vendor option was not found.
+
+% EVAL_RESULT Expression %1 evaluated to %2
+This debug message indicates that the expression has been evaluated
+to said value. This message is mostly useful during debugging of the
+client classification expressions.
diff --git a/src/lib/eval/evaluate.cc b/src/lib/eval/evaluate.cc
new file mode 100644
index 0000000..f2cadce
--- /dev/null
+++ b/src/lib/eval/evaluate.cc
@@ -0,0 +1,42 @@
+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <eval/evaluate.h>
+
+namespace isc {
+namespace dhcp {
+
+bool evaluateBool(const Expression& expr, Pkt& pkt) {
+    ValueStack values;
+    for (Expression::const_iterator it = expr.begin();
+         it != expr.end(); ++it) {
+        (*it)->evaluate(pkt, values);
+    }
+    if (values.size() != 1) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected exactly "
+                  "1 value at the end of evaluation, got " << values.size());
+    }
+    return (Token::toBool(values.top()));
+}
+
+std::string
+evaluateString(const Expression& expr, Pkt& pkt) {
+    ValueStack values;
+    for (auto it = expr.begin(); it != expr.end(); ++it) {
+        (*it)->evaluate(pkt, values);
+    }
+    if (values.size() != 1) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected exactly "
+                  "1 value at the end of evaluation, got " << values.size());
+    }
+    return (values.top());
+}
+
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
diff --git a/src/lib/eval/evaluate.h b/src/lib/eval/evaluate.h
new file mode 100644
index 0000000..b2f6eb2
--- /dev/null
+++ b/src/lib/eval/evaluate.h
@@ -0,0 +1,34 @@
+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EVALUATE_H
+#define EVALUATE_H
+
+#include <eval/token.h>
+#include <string>
+
+namespace isc {
+namespace dhcp {
+
+/// @brief Evaluate a RPN expression for a v4 or v6 packet and return
+///        a true or false decision
+///
+/// @param expr the RPN expression, i.e., a vector of parsed tokens
+/// @param pkt  The v4 or v6 packet
+/// @return the boolean decision
+/// @throw EvalStackError if there is not exactly one element on the value
+///        stack at the end of the evaluation
+/// @throw EvalTypeError if the value at the top of the stack at the
+///        end of the evaluation is not "false" or "true"
+bool evaluateBool(const Expression& expr, Pkt& pkt);
+
+
+std::string evaluateString(const Expression& expr, Pkt& pkt);
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
+
+#endif
diff --git a/src/lib/eval/lexer.cc b/src/lib/eval/lexer.cc
new file mode 100644
index 0000000..5855ede
--- /dev/null
+++ b/src/lib/eval/lexer.cc
@@ -0,0 +1,2996 @@
+#line 1 "lexer.cc"
+
+#line 3 "lexer.cc"
+
+#define  YY_INT_ALIGNED short int
+
+/* A lexical scanner generated by flex */
+
+/* %not-for-header */
+/* %if-c-only */
+/* %if-not-reentrant */
+#define yy_create_buffer eval_create_buffer
+#define yy_delete_buffer eval_delete_buffer
+#define yy_scan_buffer eval_scan_buffer
+#define yy_scan_string eval_scan_string
+#define yy_scan_bytes eval_scan_bytes
+#define yy_init_buffer eval_init_buffer
+#define yy_flush_buffer eval_flush_buffer
+#define yy_load_buffer_state eval_load_buffer_state
+#define yy_switch_to_buffer eval_switch_to_buffer
+#define yypush_buffer_state evalpush_buffer_state
+#define yypop_buffer_state evalpop_buffer_state
+#define yyensure_buffer_stack evalensure_buffer_stack
+#define yy_flex_debug eval_flex_debug
+#define yyin evalin
+#define yyleng evalleng
+#define yylex evallex
+#define yylineno evallineno
+#define yyout evalout
+#define yyrestart evalrestart
+#define yytext evaltext
+#define yywrap evalwrap
+#define yyalloc evalalloc
+#define yyrealloc evalrealloc
+#define yyfree evalfree
+
+/* %endif */
+/* %endif */
+/* %ok-for-header */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 6
+#define YY_FLEX_SUBMINOR_VERSION 4
+#if YY_FLEX_SUBMINOR_VERSION > 0
+#define FLEX_BETA
+#endif
+
+/* %if-c++-only */
+/* %endif */
+
+/* %if-c-only */
+#ifdef yy_create_buffer
+#define eval_create_buffer_ALREADY_DEFINED
+#else
+#define yy_create_buffer eval_create_buffer
+#endif
+
+#ifdef yy_delete_buffer
+#define eval_delete_buffer_ALREADY_DEFINED
+#else
+#define yy_delete_buffer eval_delete_buffer
+#endif
+
+#ifdef yy_scan_buffer
+#define eval_scan_buffer_ALREADY_DEFINED
+#else
+#define yy_scan_buffer eval_scan_buffer
+#endif
+
+#ifdef yy_scan_string
+#define eval_scan_string_ALREADY_DEFINED
+#else
+#define yy_scan_string eval_scan_string
+#endif
+
+#ifdef yy_scan_bytes
+#define eval_scan_bytes_ALREADY_DEFINED
+#else
+#define yy_scan_bytes eval_scan_bytes
+#endif
+
+#ifdef yy_init_buffer
+#define eval_init_buffer_ALREADY_DEFINED
+#else
+#define yy_init_buffer eval_init_buffer
+#endif
+
+#ifdef yy_flush_buffer
+#define eval_flush_buffer_ALREADY_DEFINED
+#else
+#define yy_flush_buffer eval_flush_buffer
+#endif
+
+#ifdef yy_load_buffer_state
+#define eval_load_buffer_state_ALREADY_DEFINED
+#else
+#define yy_load_buffer_state eval_load_buffer_state
+#endif
+
+#ifdef yy_switch_to_buffer
+#define eval_switch_to_buffer_ALREADY_DEFINED
+#else
+#define yy_switch_to_buffer eval_switch_to_buffer
+#endif
+
+#ifdef yypush_buffer_state
+#define evalpush_buffer_state_ALREADY_DEFINED
+#else
+#define yypush_buffer_state evalpush_buffer_state
+#endif
+
+#ifdef yypop_buffer_state
+#define evalpop_buffer_state_ALREADY_DEFINED
+#else
+#define yypop_buffer_state evalpop_buffer_state
+#endif
+
+#ifdef yyensure_buffer_stack
+#define evalensure_buffer_stack_ALREADY_DEFINED
+#else
+#define yyensure_buffer_stack evalensure_buffer_stack
+#endif
+
+#ifdef yylex
+#define evallex_ALREADY_DEFINED
+#else
+#define yylex evallex
+#endif
+
+#ifdef yyrestart
+#define evalrestart_ALREADY_DEFINED
+#else
+#define yyrestart evalrestart
+#endif
+
+#ifdef yylex_init
+#define evallex_init_ALREADY_DEFINED
+#else
+#define yylex_init evallex_init
+#endif
+
+#ifdef yylex_init_extra
+#define evallex_init_extra_ALREADY_DEFINED
+#else
+#define yylex_init_extra evallex_init_extra
+#endif
+
+#ifdef yylex_destroy
+#define evallex_destroy_ALREADY_DEFINED
+#else
+#define yylex_destroy evallex_destroy
+#endif
+
+#ifdef yyget_debug
+#define evalget_debug_ALREADY_DEFINED
+#else
+#define yyget_debug evalget_debug
+#endif
+
+#ifdef yyset_debug
+#define evalset_debug_ALREADY_DEFINED
+#else
+#define yyset_debug evalset_debug
+#endif
+
+#ifdef yyget_extra
+#define evalget_extra_ALREADY_DEFINED
+#else
+#define yyget_extra evalget_extra
+#endif
+
+#ifdef yyset_extra
+#define evalset_extra_ALREADY_DEFINED
+#else
+#define yyset_extra evalset_extra
+#endif
+
+#ifdef yyget_in
+#define evalget_in_ALREADY_DEFINED
+#else
+#define yyget_in evalget_in
+#endif
+
+#ifdef yyset_in
+#define evalset_in_ALREADY_DEFINED
+#else
+#define yyset_in evalset_in
+#endif
+
+#ifdef yyget_out
+#define evalget_out_ALREADY_DEFINED
+#else
+#define yyget_out evalget_out
+#endif
+
+#ifdef yyset_out
+#define evalset_out_ALREADY_DEFINED
+#else
+#define yyset_out evalset_out
+#endif
+
+#ifdef yyget_leng
+#define evalget_leng_ALREADY_DEFINED
+#else
+#define yyget_leng evalget_leng
+#endif
+
+#ifdef yyget_text
+#define evalget_text_ALREADY_DEFINED
+#else
+#define yyget_text evalget_text
+#endif
+
+#ifdef yyget_lineno
+#define evalget_lineno_ALREADY_DEFINED
+#else
+#define yyget_lineno evalget_lineno
+#endif
+
+#ifdef yyset_lineno
+#define evalset_lineno_ALREADY_DEFINED
+#else
+#define yyset_lineno evalset_lineno
+#endif
+
+#ifdef yywrap
+#define evalwrap_ALREADY_DEFINED
+#else
+#define yywrap evalwrap
+#endif
+
+/* %endif */
+
+#ifdef yyalloc
+#define evalalloc_ALREADY_DEFINED
+#else
+#define yyalloc evalalloc
+#endif
+
+#ifdef yyrealloc
+#define evalrealloc_ALREADY_DEFINED
+#else
+#define yyrealloc evalrealloc
+#endif
+
+#ifdef yyfree
+#define evalfree_ALREADY_DEFINED
+#else
+#define yyfree evalfree
+#endif
+
+/* %if-c-only */
+
+#ifdef yytext
+#define evaltext_ALREADY_DEFINED
+#else
+#define yytext evaltext
+#endif
+
+#ifdef yyleng
+#define evalleng_ALREADY_DEFINED
+#else
+#define yyleng evalleng
+#endif
+
+#ifdef yyin
+#define evalin_ALREADY_DEFINED
+#else
+#define yyin evalin
+#endif
+
+#ifdef yyout
+#define evalout_ALREADY_DEFINED
+#else
+#define yyout evalout
+#endif
+
+#ifdef yy_flex_debug
+#define eval_flex_debug_ALREADY_DEFINED
+#else
+#define yy_flex_debug eval_flex_debug
+#endif
+
+#ifdef yylineno
+#define evallineno_ALREADY_DEFINED
+#else
+#define yylineno evallineno
+#endif
+
+/* %endif */
+
+/* First, we deal with  platform-specific or compiler-specific issues. */
+
+/* begin standard C headers. */
+/* %if-c-only */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+/* %endif */
+
+/* %if-tables-serialization */
+/* %endif */
+/* end standard C headers. */
+
+/* %if-c-or-c++ */
+/* flex integer type definitions */
+
+#ifndef FLEXINT_H
+#define FLEXINT_H
+
+/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+
+/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
+ * if you want the limit (max/min) macros for int types. 
+ */
+#ifndef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS 1
+#endif
+
+#include <inttypes.h>
+typedef int8_t flex_int8_t;
+typedef uint8_t flex_uint8_t;
+typedef int16_t flex_int16_t;
+typedef uint16_t flex_uint16_t;
+typedef int32_t flex_int32_t;
+typedef uint32_t flex_uint32_t;
+#else
+typedef signed char flex_int8_t;
+typedef short int flex_int16_t;
+typedef int flex_int32_t;
+typedef unsigned char flex_uint8_t; 
+typedef unsigned short int flex_uint16_t;
+typedef unsigned int flex_uint32_t;
+
+/* Limits of integral types. */
+#ifndef INT8_MIN
+#define INT8_MIN               (-128)
+#endif
+#ifndef INT16_MIN
+#define INT16_MIN              (-32767-1)
+#endif
+#ifndef INT32_MIN
+#define INT32_MIN              (-2147483647-1)
+#endif
+#ifndef INT8_MAX
+#define INT8_MAX               (127)
+#endif
+#ifndef INT16_MAX
+#define INT16_MAX              (32767)
+#endif
+#ifndef INT32_MAX
+#define INT32_MAX              (2147483647)
+#endif
+#ifndef UINT8_MAX
+#define UINT8_MAX              (255U)
+#endif
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX             (4294967295U)
+#endif
+
+#ifndef SIZE_MAX
+#define SIZE_MAX               (~(size_t)0)
+#endif
+
+#endif /* ! C99 */
+
+#endif /* ! FLEXINT_H */
+
+/* %endif */
+
+/* begin standard C++ headers. */
+/* %if-c++-only */
+/* %endif */
+
+/* TODO: this is always defined, so inline it */
+#define yyconst const
+
+#if defined(__GNUC__) && __GNUC__ >= 3
+#define yynoreturn __attribute__((__noreturn__))
+#else
+#define yynoreturn
+#endif
+
+/* %not-for-header */
+/* Returned upon end-of-file. */
+#define YY_NULL 0
+/* %ok-for-header */
+
+/* %not-for-header */
+/* Promotes a possibly negative, possibly signed char to an
+ *   integer in range [0..255] for use as an array index.
+ */
+#define YY_SC_TO_UI(c) ((YY_CHAR) (c))
+/* %ok-for-header */
+
+/* %if-reentrant */
+/* %endif */
+
+/* %if-not-reentrant */
+
+/* %endif */
+
+/* Enter a start condition.  This macro really ought to take a parameter,
+ * but we do it the disgusting crufty way forced on us by the ()-less
+ * definition of BEGIN.
+ */
+#define BEGIN (yy_start) = 1 + 2 *
+/* Translate the current start state into a value that can be later handed
+ * to BEGIN to return to the state.  The YYSTATE alias is for lex
+ * compatibility.
+ */
+#define YY_START (((yy_start) - 1) / 2)
+#define YYSTATE YY_START
+/* Action number for EOF rule of a given start state. */
+#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
+/* Special action meaning "start processing a new file". */
+#define YY_NEW_FILE yyrestart( yyin  )
+#define YY_END_OF_BUFFER_CHAR 0
+
+/* Size of default input buffer. */
+#ifndef YY_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k.
+ * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
+ * Ditto for the __ia64__ case accordingly.
+ */
+#define YY_BUF_SIZE 32768
+#else
+#define YY_BUF_SIZE 16384
+#endif /* __ia64__ */
+#endif
+
+/* The state buf must be large enough to hold one state per character in the main buffer.
+ */
+#define YY_STATE_BUF_SIZE   ((YY_BUF_SIZE + 2) * sizeof(yy_state_type))
+
+#ifndef YY_TYPEDEF_YY_BUFFER_STATE
+#define YY_TYPEDEF_YY_BUFFER_STATE
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+#endif
+
+#ifndef YY_TYPEDEF_YY_SIZE_T
+#define YY_TYPEDEF_YY_SIZE_T
+typedef size_t yy_size_t;
+#endif
+
+/* %if-not-reentrant */
+extern int yyleng;
+/* %endif */
+
+/* %if-c-only */
+/* %if-not-reentrant */
+extern FILE *yyin, *yyout;
+/* %endif */
+/* %endif */
+
+#define EOB_ACT_CONTINUE_SCAN 0
+#define EOB_ACT_END_OF_FILE 1
+#define EOB_ACT_LAST_MATCH 2
+    
+    /* Note: We specifically omit the test for yy_rule_can_match_eol because it requires
+     *       access to the local variable yy_act. Since yyless() is a macro, it would break
+     *       existing scanners that call yyless() from OUTSIDE yylex.
+     *       One obvious solution it to make yy_act a global. I tried that, and saw
+     *       a 5% performance hit in a non-yylineno scanner, because yy_act is
+     *       normally declared as a register variable-- so it is not worth it.
+     */
+    #define  YY_LESS_LINENO(n) \
+            do { \
+                int yyl;\
+                for ( yyl = n; yyl < yyleng; ++yyl )\
+                    if ( yytext[yyl] == '\n' )\
+                        --yylineno;\
+            }while(0)
+    #define YY_LINENO_REWIND_TO(dst) \
+            do {\
+                const char *p;\
+                for ( p = yy_cp-1; p >= (dst); --p)\
+                    if ( *p == '\n' )\
+                        --yylineno;\
+            }while(0)
+    
+/* Return all but the first "n" matched characters back to the input stream. */
+#define yyless(n) \
+	do \
+		{ \
+		/* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+		*yy_cp = (yy_hold_char); \
+		YY_RESTORE_YY_MORE_OFFSET \
+		(yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
+		YY_DO_BEFORE_ACTION; /* set up yytext again */ \
+		} \
+	while ( 0 )
+#define unput(c) yyunput( c, (yytext_ptr)  )
+
+#ifndef YY_STRUCT_YY_BUFFER_STATE
+#define YY_STRUCT_YY_BUFFER_STATE
+struct yy_buffer_state
+	{
+/* %if-c-only */
+	FILE *yy_input_file;
+/* %endif */
+
+/* %if-c++-only */
+/* %endif */
+
+	char *yy_ch_buf;		/* input buffer */
+	char *yy_buf_pos;		/* current position in input buffer */
+
+	/* Size of input buffer in bytes, not including room for EOB
+	 * characters.
+	 */
+	int yy_buf_size;
+
+	/* Number of characters read into yy_ch_buf, not including EOB
+	 * characters.
+	 */
+	int yy_n_chars;
+
+	/* Whether we "own" the buffer - i.e., we know we created it,
+	 * and can realloc() it to grow it, and should free() it to
+	 * delete it.
+	 */
+	int yy_is_our_buffer;
+
+	/* Whether this is an "interactive" input source; if so, and
+	 * if we're using stdio for input, then we want to use getc()
+	 * instead of fread(), to make sure we stop fetching input after
+	 * each newline.
+	 */
+	int yy_is_interactive;
+
+	/* Whether we're considered to be at the beginning of a line.
+	 * If so, '^' rules will be active on the next match, otherwise
+	 * not.
+	 */
+	int yy_at_bol;
+
+    int yy_bs_lineno; /**< The line count. */
+    int yy_bs_column; /**< The column count. */
+
+	/* Whether to try to fill the input buffer when we reach the
+	 * end of it.
+	 */
+	int yy_fill_buffer;
+
+	int yy_buffer_status;
+
+#define YY_BUFFER_NEW 0
+#define YY_BUFFER_NORMAL 1
+	/* When an EOF's been seen but there's still some text to process
+	 * then we mark the buffer as YY_EOF_PENDING, to indicate that we
+	 * shouldn't try reading from the input source any more.  We might
+	 * still have a bunch of tokens to match, though, because of
+	 * possible backing-up.
+	 *
+	 * When we actually see the EOF, we change the status to "new"
+	 * (via yyrestart()), so that the user can continue scanning by
+	 * just pointing yyin at a new input file.
+	 */
+#define YY_BUFFER_EOF_PENDING 2
+
+	};
+#endif /* !YY_STRUCT_YY_BUFFER_STATE */
+
+/* %if-c-only Standard (non-C++) definition */
+/* %not-for-header */
+/* %if-not-reentrant */
+
+/* Stack of input buffers. */
+static size_t yy_buffer_stack_top = 0; /**< index of top of stack. */
+static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */
+static YY_BUFFER_STATE * yy_buffer_stack = NULL; /**< Stack as an array. */
+/* %endif */
+/* %ok-for-header */
+
+/* %endif */
+
+/* We provide macros for accessing buffer states in case in the
+ * future we want to put the buffer states in a more general
+ * "scanner state".
+ *
+ * Returns the top of the stack, or NULL.
+ */
+#define YY_CURRENT_BUFFER ( (yy_buffer_stack) \
+                          ? (yy_buffer_stack)[(yy_buffer_stack_top)] \
+                          : NULL)
+/* Same as previous macro, but useful when we know that the buffer stack is not
+ * NULL or when we need an lvalue. For internal use only.
+ */
+#define YY_CURRENT_BUFFER_LVALUE (yy_buffer_stack)[(yy_buffer_stack_top)]
+
+/* %if-c-only Standard (non-C++) definition */
+
+/* %if-not-reentrant */
+/* %not-for-header */
+/* yy_hold_char holds the character lost when yytext is formed. */
+static char yy_hold_char;
+static int yy_n_chars;		/* number of characters read into yy_ch_buf */
+int yyleng;
+
+/* Points to current character in buffer. */
+static char *yy_c_buf_p = NULL;
+static int yy_init = 0;		/* whether we need to initialize */
+static int yy_start = 0;	/* start state number */
+
+/* Flag which is used to allow yywrap()'s to do buffer switches
+ * instead of setting up a fresh yyin.  A bit of a hack ...
+ */
+static int yy_did_buffer_switch_on_eof;
+/* %ok-for-header */
+
+/* %endif */
+
+void yyrestart ( FILE *input_file  );
+void yy_switch_to_buffer ( YY_BUFFER_STATE new_buffer  );
+YY_BUFFER_STATE yy_create_buffer ( FILE *file, int size  );
+void yy_delete_buffer ( YY_BUFFER_STATE b  );
+void yy_flush_buffer ( YY_BUFFER_STATE b  );
+void yypush_buffer_state ( YY_BUFFER_STATE new_buffer  );
+void yypop_buffer_state ( void );
+
+static void yyensure_buffer_stack ( void );
+static void yy_load_buffer_state ( void );
+static void yy_init_buffer ( YY_BUFFER_STATE b, FILE *file  );
+#define YY_FLUSH_BUFFER yy_flush_buffer( YY_CURRENT_BUFFER )
+
+YY_BUFFER_STATE yy_scan_buffer ( char *base, yy_size_t size  );
+YY_BUFFER_STATE yy_scan_string ( const char *yy_str  );
+YY_BUFFER_STATE yy_scan_bytes ( const char *bytes, int len  );
+
+/* %endif */
+
+void *yyalloc ( yy_size_t  );
+void *yyrealloc ( void *, yy_size_t  );
+void yyfree ( void *  );
+
+#define yy_new_buffer yy_create_buffer
+#define yy_set_interactive(is_interactive) \
+	{ \
+	if ( ! YY_CURRENT_BUFFER ){ \
+        yyensure_buffer_stack (); \
+		YY_CURRENT_BUFFER_LVALUE =    \
+            yy_create_buffer( yyin, YY_BUF_SIZE ); \
+	} \
+	YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
+	}
+#define yy_set_bol(at_bol) \
+	{ \
+	if ( ! YY_CURRENT_BUFFER ){\
+        yyensure_buffer_stack (); \
+		YY_CURRENT_BUFFER_LVALUE =    \
+            yy_create_buffer( yyin, YY_BUF_SIZE ); \
+	} \
+	YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
+	}
+#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)
+
+/* %% [1.0] yytext/yyin/yyout/yy_state_type/yylineno etc. def's & init go here */
+/* Begin user sect3 */
+
+#define evalwrap() (/*CONSTCOND*/1)
+#define YY_SKIP_YYWRAP
+
+#define FLEX_DEBUG
+typedef flex_uint8_t YY_CHAR;
+
+FILE *yyin = NULL, *yyout = NULL;
+
+typedef int yy_state_type;
+
+extern int yylineno;
+int yylineno = 1;
+
+extern char *yytext;
+#ifdef yytext_ptr
+#undef yytext_ptr
+#endif
+#define yytext_ptr yytext
+
+/* %% [1.5] DFA */
+
+/* %if-c-only Standard (non-C++) definition */
+
+static yy_state_type yy_get_previous_state ( void );
+static yy_state_type yy_try_NUL_trans ( yy_state_type current_state  );
+static int yy_get_next_buffer ( void );
+static void yynoreturn yy_fatal_error ( const char* msg  );
+
+/* %endif */
+
+/* Done after the current pattern has been matched and before the
+ * corresponding action - sets up yytext.
+ */
+#define YY_DO_BEFORE_ACTION \
+	(yytext_ptr) = yy_bp; \
+/* %% [2.0] code to fiddle yytext and yyleng for yymore() goes here \ */\
+	yyleng = (int) (yy_cp - yy_bp); \
+	(yy_hold_char) = *yy_cp; \
+	*yy_cp = '\0'; \
+/* %% [3.0] code to copy yytext_ptr to yytext[] goes here, if %array \ */\
+	(yy_c_buf_p) = yy_cp;
+/* %% [4.0] data tables for the DFA and the user's section 1 definitions go here */
+#define YY_NUM_RULES 63
+#define YY_END_OF_BUFFER 64
+/* This struct is not used in this scanner,
+   but its presence is necessary. */
+struct yy_trans_info
+	{
+	flex_int32_t yy_verify;
+	flex_int32_t yy_nxt;
+	};
+static const flex_int16_t yy_accept[279] =
+    {   0,
+        0,    0,   64,   62,    1,    2,   62,   55,   56,   60,
+       61,   59,   62,   54,    5,    5,   62,   62,   62,   62,
+       57,   58,   62,   62,   62,   62,   62,   62,   62,   62,
+       62,   62,   62,   62,   62,   62,   62,   62,   62,   62,
+        1,    2,    0,    3,    5,    0,    5,    0,    0,    0,
+        0,    7,    8,    0,    0,    0,    0,    6,    0,    0,
+        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+       52,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+        0,    0,    0,    0,    4,    7,    0,   39,   51,    0,
+
+        0,    0,   20,    0,    0,    0,   15,    0,    0,    0,
+        0,    0,   21,    0,   23,    0,    0,   50,    0,    0,
+       17,    0,    0,    0,   19,    0,    0,    0,    0,    0,
+        0,    0,    0,    0,    0,   35,    0,    0,    0,    0,
+       24,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+        0,    0,   22,   30,    0,    0,    0,    0,   14,    0,
+        0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+        0,   25,   18,    0,    0,    0,    0,    0,    0,    0,
+        0,    0,    0,    0,   38,    0,    0,    0,    0,    0,
+        0,    0,    0,    0,   26,   40,    0,   16,   27,    0,
+
+       41,    0,    0,    0,    0,   53,    0,    9,    0,   10,
+       11,   29,    0,    0,    0,    0,    0,   33,   28,    7,
+        0,    0,    0,    0,    0,    0,    0,   31,    0,    0,
+       32,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+        0,   13,   12,    0,    0,    0,    0,    0,    0,    0,
+       42,    0,    0,    0,   37,    0,    0,    0,    0,   43,
+       36,    0,    0,   44,    0,    0,    0,    0,   45,   46,
+        0,    0,   47,    0,   48,   49,   34,    0
+    } ;
+
+static const YY_CHAR yy_ec[256] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    2,    1,    1,    1,    1,    1,    1,    4,    5,
+        6,    7,    8,    9,   10,   11,    1,   12,   13,   14,
+       15,   16,   17,   18,   17,   19,   17,   20,    1,    1,
+       21,    1,    1,    1,   22,   22,   22,   22,   22,   22,
+       23,   23,   23,   23,   23,   23,   23,   23,   23,   23,
+       23,   23,   23,   23,   23,   23,   23,   24,   23,   23,
+       25,    1,   26,    1,   27,    1,   28,   29,   30,   31,
+
+       32,   33,   34,   35,   36,   23,   37,   38,   39,   40,
+       41,   42,   23,   43,   44,   45,   46,   47,   23,   48,
+       49,   23,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1
+    } ;
+
+static const YY_CHAR yy_meta[50] =
+    {   0,
+        1,    1,    2,    1,    1,    1,    1,    1,    1,    1,
+        3,    4,    4,    4,    4,    4,    4,    4,    4,    5,
+        1,    6,    1,    1,    1,    1,    1,    6,    6,    6,
+        6,    6,    6,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1
+    } ;
+
+static const flex_int16_t yy_base[288] =
+    {   0,
+        0,    0,  383,  384,  380,  378,  376,  384,  384,  384,
+      384,  384,    0,  384,   39,   36,  359,  357,   86,  124,
+      384,  384,   35,   38,   34,   37,  341,   48,   43,   58,
+       63,  335,   22,   60,  343,  122,  116,  338,  341,  336,
+      369,  367,  365,  384,    0,    0,  121,  348,  347,    0,
+      346,    0,  384,  147,  158,    0,    0,  384,  334,  326,
+      332,  334,  321,  315,  314,  313,  321,  328,  307,  322,
+      304,  119,  307,  311,  310,  319,  309,  313,  301,  300,
+        0,  312,  298,  304,  313,  302,  309,  309,  289,  308,
+      295,  294,  305,  321,    0,    0,  288,    0,    0,  299,
+
+      299,  300,    0,  295,  282,  294,  280,  283,  280,  291,
+      282,  157,    0,  282,    0,  289,  272,    0,  280,  272,
+      159,  286,  282,  276,    0,  267,  265,  269,  263,  276,
+      275,    0,  260,  273,  275,    0,  259,  256,  269,  254,
+        0,  266,  265,  252,  277,  280,  248,  264,  259,  241,
+      248,  260,    0,    0,  238,  255,  240,  239,    0,  239,
+      166,  241,  250,  269,  238,  235,  232,  234,  231,  231,
+      230,    0,    0,  240,  226,  225,  228,  237,  224,  224,
+      225,  233,  162,  220,    0,  219,  225,  242,  245,  213,
+      214,  213,    0,  210,    0,    0,  211,    0,    0,  217,
+
+        0,  211,  210,  205,  218,    0,  216,    0,  216,    0,
+        0,    0,  210,  214,  199,  198,  201,  231,    0,    0,
+      208,  203,  198,  192,  191,  203,  191,    0,  190,  192,
+        0,  190,  189,  184,  160,  180,  183,  192,  193,  192,
+      175,    0,    0,  188,  176,  175,  187,  180,  172,  184,
+        0,  167,  166,  168,    0,  180,  179,  162,  176,    0,
+        0,  147,  144,    0,  140,  139,  138,  138,    0,    0,
+      129,  126,    0,  123,    0,    0,    0,  384,  190,  162,
+      193,  107,  196,  199,  203,   78,   77
+    } ;
+
+static const flex_int16_t yy_def[288] =
+    {   0,
+      278,    1,  278,  278,  278,  278,  279,  278,  278,  278,
+      278,  278,  280,  278,  278,   15,  281,  278,  278,   19,
+      278,  278,   19,   19,   19,   19,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+      278,  278,  279,  278,  280,  282,   15,  281,  283,  284,
+      281,  285,  278,  278,   20,   19,   20,  278,   19,   20,
+       20,   20,   20,   19,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,  282,  284,  285,   19,   20,   20,   20,
+
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,  286,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,  286,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,  287,   20,   20,   20,   20,   20,   20,   20,
+
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,  287,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   20,   20,   20,    0,  278,  278,
+      278,  278,  278,  278,  278,  278,  278
+    } ;
+
+static const flex_int16_t yy_nxt[434] =
+    {   0,
+        4,    5,    6,    7,    8,    9,   10,   11,   12,   13,
+       14,   15,   16,   16,   16,   16,   16,   16,   16,   17,
+       18,   19,   20,   20,   21,   22,    4,   23,   19,   24,
+       25,   26,   19,   27,   28,   29,   20,   30,   31,   32,
+       33,   34,   35,   36,   37,   38,   39,   20,   40,   46,
+       47,   47,   47,   47,   47,   47,   47,   47,   48,  278,
+       49,   64,   50,   80,   81,   59,   49,   49,   49,   49,
+       49,   49,   60,   62,   61,   72,   66,   65,   63,   69,
+      220,  164,   73,  278,   67,   70,   50,   54,   54,   74,
+       76,   82,   71,   75,   77,   55,   83,   56,   56,   56,
+
+       56,   56,   56,   56,   56,   48,   78,   56,   57,   57,
+       94,   58,   55,   56,   56,   56,   56,   56,   56,   57,
+       57,   57,   57,   57,   57,   57,   57,   57,   57,   57,
+       57,   57,   57,   57,   57,   57,   57,   57,   57,   57,
+       57,   57,   57,  278,  278,   57,  110,   89,   54,   54,
+      111,   57,   57,   57,   57,   57,   57,   85,   90,  278,
+      278,  278,  278,   86,   87,   45,  277,   88,  278,  145,
+      276,  146,   58,  275,  153,  147,  154,  210,  188,  211,
+      189,  274,  273,  278,  190,  278,  272,  271,  270,  248,
+       43,  269,   43,   43,   43,   43,   51,   51,   51,   49,
+
+       49,   49,   95,  268,   95,   96,   96,   96,   96,  267,
+      266,  265,  264,  263,  262,  261,  260,  259,  258,  257,
+      256,  255,  254,  253,  252,  251,  250,  249,  247,  246,
+      245,  244,  243,  242,  241,  240,  239,  238,  237,  236,
+      235,  234,  233,  232,  231,  230,  229,  228,  227,  226,
+      225,  224,  223,  222,  221,  219,  218,  217,  216,  215,
+      214,  213,  212,  209,  208,  207,  206,  205,  204,  203,
+      202,  201,  200,  199,  198,  197,  196,  195,  194,  193,
+      192,  191,  187,  186,  185,  184,  183,  182,  181,  180,
+      179,  178,  177,  176,  175,  174,  173,  172,  171,  170,
+
+      169,  168,  167,  166,  165,  163,  162,  161,  160,  159,
+      158,  157,  156,  155,  152,  151,  150,  149,  148,  144,
+      143,  142,  141,  140,  139,  138,  137,  136,  135,  134,
+      133,  132,  131,  130,  129,  128,  127,  126,  125,  124,
+      123,  122,  121,  120,  119,  118,  117,  116,  115,  114,
+      113,  112,  109,  108,  107,  106,  105,  104,  103,  102,
+      101,  100,   99,   98,   97,   52,   48,   52,   44,   42,
+       41,   93,   92,   91,   84,   79,   68,   53,   52,   44,
+       42,   41,  278,    3,  278,  278,  278,  278,  278,  278,
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278
+    } ;
+
+static const flex_int16_t yy_chk[434] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,   15,
+       15,   15,   15,   15,   15,   15,   15,   15,   15,   16,
+       15,   25,   15,   33,   33,   23,   15,   15,   15,   15,
+       15,   15,   23,   24,   23,   29,   26,   25,   24,   28,
+      287,  286,   29,   16,   26,   28,   15,   19,   19,   30,
+       31,   34,   28,   30,   31,   19,   34,   19,   19,   19,
+
+       19,   19,   19,   19,   19,   19,   31,   19,   19,   19,
+      282,   19,   19,   19,   19,   19,   19,   19,   19,   19,
+       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
+       19,   19,   19,   19,   19,   20,   20,   20,   20,   20,
+       20,   20,   20,   20,   47,   20,   72,   37,   54,   54,
+       72,   20,   20,   20,   20,   20,   20,   36,   37,   55,
+       55,  235,  235,   36,   36,  280,  274,   36,   47,  112,
+      272,  112,   54,  271,  121,  112,  121,  183,  161,  183,
+      161,  268,  267,   55,  161,  235,  266,  265,  263,  235,
+      279,  262,  279,  279,  279,  279,  281,  281,  281,  283,
+
+      283,  283,  284,  259,  284,  285,  285,  285,  285,  258,
+      257,  256,  254,  253,  252,  250,  249,  248,  247,  246,
+      245,  244,  241,  240,  239,  238,  237,  236,  234,  233,
+      232,  230,  229,  227,  226,  225,  224,  223,  222,  221,
+      218,  217,  216,  215,  214,  213,  209,  207,  205,  204,
+      203,  202,  200,  197,  194,  192,  191,  190,  189,  188,
+      187,  186,  184,  182,  181,  180,  179,  178,  177,  176,
+      175,  174,  171,  170,  169,  168,  167,  166,  165,  164,
+      163,  162,  160,  158,  157,  156,  155,  152,  151,  150,
+      149,  148,  147,  146,  145,  144,  143,  142,  140,  139,
+
+      138,  137,  135,  134,  133,  131,  130,  129,  128,  127,
+      126,  124,  123,  122,  120,  119,  117,  116,  114,  111,
+      110,  109,  108,  107,  106,  105,  104,  102,  101,  100,
+       97,   94,   93,   92,   91,   90,   89,   88,   87,   86,
+       85,   84,   83,   82,   80,   79,   78,   77,   76,   75,
+       74,   73,   71,   70,   69,   68,   67,   66,   65,   64,
+       63,   62,   61,   60,   59,   51,   49,   48,   43,   42,
+       41,   40,   39,   38,   35,   32,   27,   18,   17,    7,
+        6,    5,    3,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278,  278,  278,  278,  278,  278,  278,  278,
+      278,  278,  278
+    } ;
+
+/* Table of booleans, true if rule could match eol. */
+static const flex_int32_t yy_rule_can_match_eol[64] =
+    {   0,
+0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0,     };
+
+static yy_state_type yy_last_accepting_state;
+static char *yy_last_accepting_cpos;
+
+extern int yy_flex_debug;
+int yy_flex_debug = 1;
+
+static const flex_int16_t yy_rule_linenum[63] =
+    {   0,
+      106,  111,  117,  127,  133,  151,  175,  189,  190,  191,
+      192,  193,  194,  195,  196,  197,  198,  199,  200,  201,
+      202,  203,  204,  205,  206,  207,  208,  209,  210,  211,
+      212,  213,  214,  215,  216,  217,  218,  219,  220,  221,
+      222,  223,  224,  225,  226,  227,  228,  229,  230,  231,
+      232,  233,  234,  235,  236,  237,  238,  239,  240,  241,
+      242,  243
+    } ;
+
+/* The intent behind this definition is that it'll catch
+ * any uses of REJECT which flex missed.
+ */
+#define REJECT reject_used_but_not_detected
+#define yymore() yymore_used_but_not_detected
+#define YY_MORE_ADJ 0
+#define YY_RESTORE_YY_MORE_OFFSET
+char *yytext;
+#line 1 "lexer.ll"
+/* Copyright (C) 2015-2022 Internet Systems Consortium, Inc. ("ISC")
+
+   This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#line 8 "lexer.ll"
+
+/* Generated files do not make clang static analyser so happy */
+#ifndef __clang_analyzer__
+
+#include <cerrno>
+#include <climits>
+#include <cstdlib>
+#include <string>
+#include <eval/eval_context.h>
+#include <eval/parser.h>
+#include <asiolink/io_address.h>
+#include <boost/lexical_cast.hpp>
+
+/* Please avoid C++ style comments (// ... eol) as they break flex 2.6.2 */
+
+/* Work around an incompatibility in flex (at least versions
+   2.5.31 through 2.5.33): it generates code that does
+   not conform to C89.  See Debian bug 333231
+   <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
+# undef yywrap
+# define yywrap() 1
+
+/* The location of the current token. The lexer will keep updating it. This
+   variable will be useful for logging errors. */
+static isc::eval::location loc;
+
+namespace {
+    bool start_token_flag = false;
+    isc::eval::EvalContext::ParserType start_token_value;
+};
+
+/* To avoid the call to exit... oops! */
+#define YY_FATAL_ERROR(msg) isc::eval::EvalContext::fatal(msg)
+#line 1044 "lexer.cc"
+/* noyywrap disables automatic rewinding for the next file to parse. Since we
+   always parse only a single string, there's no need to do any wraps. And
+   using yywrap requires linking with -lfl, which provides the default yywrap
+   implementation that always returns 1 anyway. */
+/* nounput simplifies the lexer, by removing support for putting a character
+   back into the input stream. We never use such capability anyway. */
+/* batch means that we'll never use the generated lexer interactively. */
+/* Enables debug mode. To see the debug messages, one needs to also set
+   eval_flex_debug to 1, then the debug messages will be printed on stderr. */
+/* I have no idea what this option does, except it was specified in the bison
+   examples and Postgres folks added it to remove gcc 4.3 warnings. Let's
+   be on the safe side and keep it. */
+#define YY_NO_INPUT 1
+/* This line tells flex to track the line numbers. It's not really that
+   useful for client classes, which typically are one-liners, but it may be
+   useful in more complex cases. */
+/* These are not token expressions yet, just convenience expressions that
+   can be used during actual token definitions. Note some can match
+   incorrect inputs (e.g., IP addresses) which must be checked. */
+#line 80 "lexer.ll"
+/* This code run each time a pattern is matched. It updates the location
+   by moving it ahead by yyleng bytes. yyleng specifies the length of the
+   currently matched token. */
+#define YY_USER_ACTION  loc.columns(evalleng);
+#line 1069 "lexer.cc"
+#line 1070 "lexer.cc"
+
+#define INITIAL 0
+
+#ifndef YY_NO_UNISTD_H
+/* Special case for "unistd.h", since it is non-ANSI. We include it way
+ * down here because we want the user's section 1 to have been scanned first.
+ * The user has a chance to override it with an option.
+ */
+/* %if-c-only */
+#include <unistd.h>
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+#endif
+
+#ifndef YY_EXTRA_TYPE
+#define YY_EXTRA_TYPE void *
+#endif
+
+/* %if-c-only Reentrant structure and macros (non-C++). */
+/* %if-reentrant */
+/* %if-c-only */
+
+static int yy_init_globals ( void );
+
+/* %endif */
+/* %if-reentrant */
+/* %endif */
+/* %endif End reentrant structures and macros. */
+
+/* Accessor methods to globals.
+   These are made visible to non-reentrant scanners for convenience. */
+
+int yylex_destroy ( void );
+
+int yyget_debug ( void );
+
+void yyset_debug ( int debug_flag  );
+
+YY_EXTRA_TYPE yyget_extra ( void );
+
+void yyset_extra ( YY_EXTRA_TYPE user_defined  );
+
+FILE *yyget_in ( void );
+
+void yyset_in  ( FILE * _in_str  );
+
+FILE *yyget_out ( void );
+
+void yyset_out  ( FILE * _out_str  );
+
+			int yyget_leng ( void );
+
+char *yyget_text ( void );
+
+int yyget_lineno ( void );
+
+void yyset_lineno ( int _line_number  );
+
+/* %if-bison-bridge */
+/* %endif */
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int yywrap ( void );
+#else
+extern int yywrap ( void );
+#endif
+#endif
+
+/* %not-for-header */
+#ifndef YY_NO_UNPUT
+    
+#endif
+/* %ok-for-header */
+
+/* %endif */
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy ( char *, const char *, int );
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen ( const char * );
+#endif
+
+#ifndef YY_NO_INPUT
+/* %if-c-only Standard (non-C++) definition */
+/* %not-for-header */
+#ifdef __cplusplus
+static int yyinput ( void );
+#else
+static int input ( void );
+#endif
+/* %ok-for-header */
+
+/* %endif */
+#endif
+
+/* %if-c-only */
+
+/* %endif */
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k */
+#define YY_READ_BUF_SIZE 16384
+#else
+#define YY_READ_BUF_SIZE 8192
+#endif /* __ia64__ */
+#endif
+
+/* Copy whatever the last rule matched to the standard output. */
+#ifndef ECHO
+/* %if-c-only Standard (non-C++) definition */
+/* This used to be an fputs(), but since the string might contain NUL's,
+ * we now use fwrite().
+ */
+#define ECHO do { if (fwrite( yytext, (size_t) yyleng, 1, yyout )) {} } while (0)
+/* %endif */
+/* %if-c++-only C++ definition */
+/* %endif */
+#endif
+
+/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
+ * is returned in "result".
+ */
+#ifndef YY_INPUT
+#define YY_INPUT(buf,result,max_size) \
+/* %% [5.0] fread()/read() definition of YY_INPUT goes here unless we're doing C++ \ */\
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
+		{ \
+		int c = '*'; \
+		int n; \
+		for ( n = 0; n < max_size && \
+			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
+			buf[n] = (char) c; \
+		if ( c == '\n' ) \
+			buf[n++] = (char) c; \
+		if ( c == EOF && ferror( yyin ) ) \
+			YY_FATAL_ERROR( "input in flex scanner failed" ); \
+		result = n; \
+		} \
+	else \
+		{ \
+		errno=0; \
+		while ( (result = (int) fread(buf, 1, (yy_size_t) max_size, yyin)) == 0 && ferror(yyin)) \
+			{ \
+			if( errno != EINTR) \
+				{ \
+				YY_FATAL_ERROR( "input in flex scanner failed" ); \
+				break; \
+				} \
+			errno=0; \
+			clearerr(yyin); \
+			} \
+		}\
+\
+/* %if-c++-only C++ definition \ */\
+/* %endif */
+
+#endif
+
+/* No semi-colon after return; correct usage is to write "yyterminate();" -
+ * we don't want an extra ';' after the "return" because that will cause
+ * some compilers to complain about unreachable statements.
+ */
+#ifndef yyterminate
+#define yyterminate() return YY_NULL
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Report a fatal error. */
+#ifndef YY_FATAL_ERROR
+/* %if-c-only */
+#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+#endif
+
+/* %if-tables-serialization structures and prototypes */
+/* %not-for-header */
+/* %ok-for-header */
+
+/* %not-for-header */
+/* %tables-yydmap generated elements */
+/* %endif */
+/* end tables serialization structures and prototypes */
+
+/* %ok-for-header */
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL_IS_OURS 1
+/* %if-c-only Standard (non-C++) definition */
+
+extern int yylex (void);
+
+#define YY_DECL int yylex (void)
+/* %endif */
+/* %if-c++-only C++ definition */
+/* %endif */
+#endif /* !YY_DECL */
+
+/* Code executed at the beginning of each rule, after yytext and yyleng
+ * have been set up.
+ */
+#ifndef YY_USER_ACTION
+#define YY_USER_ACTION
+#endif
+
+/* Code executed at the end of each rule. */
+#ifndef YY_BREAK
+#define YY_BREAK /*LINTED*/break;
+#endif
+
+/* %% [6.0] YY_RULE_SETUP definition goes here */
+#define YY_RULE_SETUP \
+	YY_USER_ACTION
+
+/* %not-for-header */
+/** The main scanner function which does all the work.
+ */
+YY_DECL
+{
+	yy_state_type yy_current_state;
+	char *yy_cp, *yy_bp;
+	int yy_act;
+    
+	if ( !(yy_init) )
+		{
+		(yy_init) = 1;
+
+#ifdef YY_USER_INIT
+		YY_USER_INIT;
+#endif
+
+		if ( ! (yy_start) )
+			(yy_start) = 1;	/* first start state */
+
+		if ( ! yyin )
+/* %if-c-only */
+			yyin = stdin;
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+
+		if ( ! yyout )
+/* %if-c-only */
+			yyout = stdout;
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+
+		if ( ! YY_CURRENT_BUFFER ) {
+			yyensure_buffer_stack ();
+			YY_CURRENT_BUFFER_LVALUE =
+				yy_create_buffer( yyin, YY_BUF_SIZE );
+		}
+
+		yy_load_buffer_state(  );
+		}
+
+	{
+/* %% [7.0] user's declarations go here */
+#line 86 "lexer.ll"
+
+
+
+#line 90 "lexer.ll"
+    /* Code run each time evallex is called. */
+    loc.step();
+
+    if (start_token_flag) {
+        start_token_flag = false;
+        switch (start_token_value) {
+        case EvalContext::PARSER_BOOL:
+            return isc::eval::EvalParser::make_TOPLEVEL_BOOL(loc);
+        default:
+        case EvalContext::PARSER_STRING:
+            return isc::eval::EvalParser::make_TOPLEVEL_STRING(loc);
+        }
+    }
+
+
+
+#line 1369 "lexer.cc"
+
+	while ( /*CONSTCOND*/1 )		/* loops until end-of-file is reached */
+		{
+/* %% [8.0] yymore()-related code goes here */
+		yy_cp = (yy_c_buf_p);
+
+		/* Support of yytext. */
+		*yy_cp = (yy_hold_char);
+
+		/* yy_bp points to the position in yy_ch_buf of the start of
+		 * the current run.
+		 */
+		yy_bp = yy_cp;
+
+/* %% [9.0] code to set up and find next match goes here */
+		yy_current_state = (yy_start);
+yy_match:
+		do
+			{
+			YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)] ;
+			if ( yy_accept[yy_current_state] )
+				{
+				(yy_last_accepting_state) = yy_current_state;
+				(yy_last_accepting_cpos) = yy_cp;
+				}
+			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+				{
+				yy_current_state = (int) yy_def[yy_current_state];
+				if ( yy_current_state >= 279 )
+					yy_c = yy_meta[yy_c];
+				}
+			yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
+			++yy_cp;
+			}
+		while ( yy_current_state != 278 );
+		yy_cp = (yy_last_accepting_cpos);
+		yy_current_state = (yy_last_accepting_state);
+
+yy_find_action:
+/* %% [10.0] code to find the action number goes here */
+		yy_act = yy_accept[yy_current_state];
+
+		YY_DO_BEFORE_ACTION;
+
+/* %% [11.0] code for yylineno update goes here */
+
+		if ( yy_act != YY_END_OF_BUFFER && yy_rule_can_match_eol[yy_act] )
+			{
+			int yyl;
+			for ( yyl = 0; yyl < yyleng; ++yyl )
+				if ( yytext[yyl] == '\n' )
+					
+    yylineno++;
+;
+			}
+
+do_action:	/* This label is used only to access EOF actions. */
+
+/* %% [12.0] debug code goes here */
+		if ( yy_flex_debug )
+			{
+			if ( yy_act == 0 )
+				fprintf( stderr, "--scanner backing up\n" );
+			else if ( yy_act < 63 )
+				fprintf( stderr, "--accepting rule at line %ld (\"%s\")\n",
+				         (long)yy_rule_linenum[yy_act], yytext );
+			else if ( yy_act == 63 )
+				fprintf( stderr, "--accepting default rule (\"%s\")\n",
+				         yytext );
+			else if ( yy_act == 64 )
+				fprintf( stderr, "--(end of buffer or a NUL)\n" );
+			else
+				fprintf( stderr, "--EOF (start condition %d)\n", YY_START );
+			}
+
+		switch ( yy_act )
+	{ /* beginning of action switch */
+/* %% [13.0] actions go here */
+			case 0: /* must back up */
+			/* undo the effects of YY_DO_BEFORE_ACTION */
+			*yy_cp = (yy_hold_char);
+			yy_cp = (yy_last_accepting_cpos);
+			yy_current_state = (yy_last_accepting_state);
+			goto yy_find_action;
+
+case 1:
+YY_RULE_SETUP
+#line 106 "lexer.ll"
+{
+    /* Ok, we found a with space. Let's ignore it and update loc variable. */
+    loc.step();
+}
+	YY_BREAK
+case 2:
+/* rule 2 can match eol */
+YY_RULE_SETUP
+#line 111 "lexer.ll"
+{
+    /* Newline found. Let's update the location and continue. */
+    loc.lines(evalleng);
+    loc.step();
+}
+	YY_BREAK
+case 3:
+YY_RULE_SETUP
+#line 117 "lexer.ll"
+{
+    /* A string has been matched. It contains the actual string and single quotes.
+       We need to get those quotes out of the way and just use its content, e.g.
+       for 'foo' we should get foo */
+    std::string tmp(evaltext+1);
+    tmp.resize(tmp.size() - 1);
+
+    return isc::eval::EvalParser::make_STRING(tmp, loc);
+}
+	YY_BREAK
+case 4:
+YY_RULE_SETUP
+#line 127 "lexer.ll"
+{
+    /* A hex string has been matched. It contains the '0x' or '0X' header
+       followed by at least one hexadecimal digit. */
+    return isc::eval::EvalParser::make_HEXSTRING(evaltext, loc);
+}
+	YY_BREAK
+case 5:
+YY_RULE_SETUP
+#line 133 "lexer.ll"
+{
+    /* An integer was found. */
+    std::string tmp(evaltext);
+
+    try {
+        /* In substring we want to use negative values (e.g. -1).
+           In enterprise-id we need to use values up to 0xffffffff.
+           To cover both of those use cases, we need at least
+           int64_t. */
+        static_cast<void>(boost::lexical_cast<int64_t>(tmp));
+    } catch (const boost::bad_lexical_cast &) {
+        driver.error(loc, "Failed to convert " + tmp + " to an integer.");
+    }
+
+    /* The parser needs the string form as double conversion is no lossless */
+    return isc::eval::EvalParser::make_INTEGER(tmp, loc);
+}
+	YY_BREAK
+case 6:
+/* rule 6 can match eol */
+*yy_cp = (yy_hold_char); /* undo effects of setting up yytext */
+YY_LINENO_REWIND_TO(yy_cp - 1);
+(yy_c_buf_p) = yy_cp -= 1;
+YY_DO_BEFORE_ACTION; /* set up yytext again */
+YY_RULE_SETUP
+#line 151 "lexer.ll"
+{
+    /* This string specifies option name starting with a letter
+       and further containing letters, digits, hyphens and
+       underscores and finishing by letters or digits. */
+    /* Moved from a variable trailing context to C++ code as it was too slow */
+    std::string tmp(evaltext);
+    /* remove possible trailing blanks or newlines */
+    while (tmp.size() > 1) {
+        char last = tmp[tmp.size() - 1];
+        if ((last != ' ') && (last != '\t') && (last != '\n')) {
+            break;
+        }
+        if (last == '\n') {
+            /* Take embedded newlines into account */
+            /* Can make it more complex to handle spaces after the last
+               newline but currently keep it simple... */
+            loc.lines();
+            loc.step();
+        }
+        tmp.resize(tmp.size() - 1);
+    }
+    return isc::eval::EvalParser::make_OPTION_NAME(tmp, loc);
+}
+	YY_BREAK
+case 7:
+YY_RULE_SETUP
+#line 175 "lexer.ll"
+{
+    /* IPv4 or IPv6 address */
+    std::string tmp(evaltext);
+
+    /* Some incorrect addresses can match so we have to check. */
+    try {
+        isc::asiolink::IOAddress ip(tmp);
+    } catch (...) {
+        driver.error(loc, "Failed to convert " + tmp + " to an IP address.");
+    }
+
+    return isc::eval::EvalParser::make_IP_ADDRESS(evaltext, loc);
+}
+	YY_BREAK
+case 8:
+YY_RULE_SETUP
+#line 189 "lexer.ll"
+return isc::eval::EvalParser::make_EQUAL(loc);
+	YY_BREAK
+case 9:
+YY_RULE_SETUP
+#line 190 "lexer.ll"
+return isc::eval::EvalParser::make_OPTION(loc);
+	YY_BREAK
+case 10:
+YY_RULE_SETUP
+#line 191 "lexer.ll"
+return isc::eval::EvalParser::make_RELAY4(loc);
+	YY_BREAK
+case 11:
+YY_RULE_SETUP
+#line 192 "lexer.ll"
+return isc::eval::EvalParser::make_RELAY6(loc);
+	YY_BREAK
+case 12:
+YY_RULE_SETUP
+#line 193 "lexer.ll"
+return isc::eval::EvalParser::make_PEERADDR(loc);
+	YY_BREAK
+case 13:
+YY_RULE_SETUP
+#line 194 "lexer.ll"
+return isc::eval::EvalParser::make_LINKADDR(loc);
+	YY_BREAK
+case 14:
+YY_RULE_SETUP
+#line 195 "lexer.ll"
+return isc::eval::EvalParser::make_TEXT(loc);
+	YY_BREAK
+case 15:
+YY_RULE_SETUP
+#line 196 "lexer.ll"
+return isc::eval::EvalParser::make_HEX(loc);
+	YY_BREAK
+case 16:
+YY_RULE_SETUP
+#line 197 "lexer.ll"
+return isc::eval::EvalParser::make_EXISTS(loc);
+	YY_BREAK
+case 17:
+YY_RULE_SETUP
+#line 198 "lexer.ll"
+return isc::eval::EvalParser::make_PKT(loc);
+	YY_BREAK
+case 18:
+YY_RULE_SETUP
+#line 199 "lexer.ll"
+return isc::eval::EvalParser::make_IFACE(loc);
+	YY_BREAK
+case 19:
+YY_RULE_SETUP
+#line 200 "lexer.ll"
+return isc::eval::EvalParser::make_SRC(loc);
+	YY_BREAK
+case 20:
+YY_RULE_SETUP
+#line 201 "lexer.ll"
+return isc::eval::EvalParser::make_DST(loc);
+	YY_BREAK
+case 21:
+YY_RULE_SETUP
+#line 202 "lexer.ll"
+return isc::eval::EvalParser::make_LEN(loc);
+	YY_BREAK
+case 22:
+YY_RULE_SETUP
+#line 203 "lexer.ll"
+return isc::eval::EvalParser::make_PKT4(loc);
+	YY_BREAK
+case 23:
+YY_RULE_SETUP
+#line 204 "lexer.ll"
+return isc::eval::EvalParser::make_CHADDR(loc);
+	YY_BREAK
+case 24:
+YY_RULE_SETUP
+#line 205 "lexer.ll"
+return isc::eval::EvalParser::make_HLEN(loc);
+	YY_BREAK
+case 25:
+YY_RULE_SETUP
+#line 206 "lexer.ll"
+return isc::eval::EvalParser::make_HTYPE(loc);
+	YY_BREAK
+case 26:
+YY_RULE_SETUP
+#line 207 "lexer.ll"
+return isc::eval::EvalParser::make_CIADDR(loc);
+	YY_BREAK
+case 27:
+YY_RULE_SETUP
+#line 208 "lexer.ll"
+return isc::eval::EvalParser::make_GIADDR(loc);
+	YY_BREAK
+case 28:
+YY_RULE_SETUP
+#line 209 "lexer.ll"
+return isc::eval::EvalParser::make_YIADDR(loc);
+	YY_BREAK
+case 29:
+YY_RULE_SETUP
+#line 210 "lexer.ll"
+return isc::eval::EvalParser::make_SIADDR(loc);
+	YY_BREAK
+case 30:
+YY_RULE_SETUP
+#line 211 "lexer.ll"
+return isc::eval::EvalParser::make_PKT6(loc);
+	YY_BREAK
+case 31:
+YY_RULE_SETUP
+#line 212 "lexer.ll"
+return isc::eval::EvalParser::make_MSGTYPE(loc);
+	YY_BREAK
+case 32:
+YY_RULE_SETUP
+#line 213 "lexer.ll"
+return isc::eval::EvalParser::make_TRANSID(loc);
+	YY_BREAK
+case 33:
+YY_RULE_SETUP
+#line 214 "lexer.ll"
+return isc::eval::EvalParser::make_VENDOR(loc);
+	YY_BREAK
+case 34:
+YY_RULE_SETUP
+#line 215 "lexer.ll"
+return isc::eval::EvalParser::make_VENDOR_CLASS(loc);
+	YY_BREAK
+case 35:
+YY_RULE_SETUP
+#line 216 "lexer.ll"
+return isc::eval::EvalParser::make_DATA(loc);
+	YY_BREAK
+case 36:
+YY_RULE_SETUP
+#line 217 "lexer.ll"
+return isc::eval::EvalParser::make_ENTERPRISE(loc);
+	YY_BREAK
+case 37:
+YY_RULE_SETUP
+#line 218 "lexer.ll"
+return isc::eval::EvalParser::make_SUBSTRING(loc);
+	YY_BREAK
+case 38:
+YY_RULE_SETUP
+#line 219 "lexer.ll"
+return isc::eval::EvalParser::make_SPLIT(loc);
+	YY_BREAK
+case 39:
+YY_RULE_SETUP
+#line 220 "lexer.ll"
+return isc::eval::EvalParser::make_ALL(loc);
+	YY_BREAK
+case 40:
+YY_RULE_SETUP
+#line 221 "lexer.ll"
+return isc::eval::EvalParser::make_CONCAT(loc);
+	YY_BREAK
+case 41:
+YY_RULE_SETUP
+#line 222 "lexer.ll"
+return isc::eval::EvalParser::make_IFELSE(loc);
+	YY_BREAK
+case 42:
+YY_RULE_SETUP
+#line 223 "lexer.ll"
+return isc::eval::EvalParser::make_TOHEXSTRING(loc);
+	YY_BREAK
+case 43:
+YY_RULE_SETUP
+#line 224 "lexer.ll"
+return isc::eval::EvalParser::make_ADDRTOTEXT(loc);
+	YY_BREAK
+case 44:
+YY_RULE_SETUP
+#line 225 "lexer.ll"
+return isc::eval::EvalParser::make_INT8TOTEXT(loc);
+	YY_BREAK
+case 45:
+YY_RULE_SETUP
+#line 226 "lexer.ll"
+return isc::eval::EvalParser::make_INT16TOTEXT(loc);
+	YY_BREAK
+case 46:
+YY_RULE_SETUP
+#line 227 "lexer.ll"
+return isc::eval::EvalParser::make_INT32TOTEXT(loc);
+	YY_BREAK
+case 47:
+YY_RULE_SETUP
+#line 228 "lexer.ll"
+return isc::eval::EvalParser::make_UINT8TOTEXT(loc);
+	YY_BREAK
+case 48:
+YY_RULE_SETUP
+#line 229 "lexer.ll"
+return isc::eval::EvalParser::make_UINT16TOTEXT(loc);
+	YY_BREAK
+case 49:
+YY_RULE_SETUP
+#line 230 "lexer.ll"
+return isc::eval::EvalParser::make_UINT32TOTEXT(loc);
+	YY_BREAK
+case 50:
+YY_RULE_SETUP
+#line 231 "lexer.ll"
+return isc::eval::EvalParser::make_NOT(loc);
+	YY_BREAK
+case 51:
+YY_RULE_SETUP
+#line 232 "lexer.ll"
+return isc::eval::EvalParser::make_AND(loc);
+	YY_BREAK
+case 52:
+YY_RULE_SETUP
+#line 233 "lexer.ll"
+return isc::eval::EvalParser::make_OR(loc);
+	YY_BREAK
+case 53:
+YY_RULE_SETUP
+#line 234 "lexer.ll"
+return isc::eval::EvalParser::make_MEMBER(loc);
+	YY_BREAK
+case 54:
+YY_RULE_SETUP
+#line 235 "lexer.ll"
+return isc::eval::EvalParser::make_DOT(loc);
+	YY_BREAK
+case 55:
+YY_RULE_SETUP
+#line 236 "lexer.ll"
+return isc::eval::EvalParser::make_LPAREN(loc);
+	YY_BREAK
+case 56:
+YY_RULE_SETUP
+#line 237 "lexer.ll"
+return isc::eval::EvalParser::make_RPAREN(loc);
+	YY_BREAK
+case 57:
+YY_RULE_SETUP
+#line 238 "lexer.ll"
+return isc::eval::EvalParser::make_LBRACKET(loc);
+	YY_BREAK
+case 58:
+YY_RULE_SETUP
+#line 239 "lexer.ll"
+return isc::eval::EvalParser::make_RBRACKET(loc);
+	YY_BREAK
+case 59:
+YY_RULE_SETUP
+#line 240 "lexer.ll"
+return isc::eval::EvalParser::make_COMA(loc);
+	YY_BREAK
+case 60:
+YY_RULE_SETUP
+#line 241 "lexer.ll"
+return isc::eval::EvalParser::make_ANY(loc);
+	YY_BREAK
+case 61:
+YY_RULE_SETUP
+#line 242 "lexer.ll"
+return isc::eval::EvalParser::make_PLUS(loc);
+	YY_BREAK
+case 62:
+YY_RULE_SETUP
+#line 243 "lexer.ll"
+driver.error (loc, "Invalid character: " + std::string(evaltext));
+	YY_BREAK
+case YY_STATE_EOF(INITIAL):
+#line 244 "lexer.ll"
+return isc::eval::EvalParser::make_END(loc);
+	YY_BREAK
+case 63:
+YY_RULE_SETUP
+#line 245 "lexer.ll"
+ECHO;
+	YY_BREAK
+#line 1849 "lexer.cc"
+
+	case YY_END_OF_BUFFER:
+		{
+		/* Amount of text matched not including the EOB char. */
+		int yy_amount_of_matched_text = (int) (yy_cp - (yytext_ptr)) - 1;
+
+		/* Undo the effects of YY_DO_BEFORE_ACTION. */
+		*yy_cp = (yy_hold_char);
+		YY_RESTORE_YY_MORE_OFFSET
+
+		if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
+			{
+			/* We're scanning a new file or input source.  It's
+			 * possible that this happened because the user
+			 * just pointed yyin at a new source and called
+			 * yylex().  If so, then we have to assure
+			 * consistency between YY_CURRENT_BUFFER and our
+			 * globals.  Here is the right place to do so, because
+			 * this is the first action (other than possibly a
+			 * back-up) that will match for the new input source.
+			 */
+			(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+/* %if-c-only */
+			YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin;
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
+			}
+
+		/* Note that here we test for yy_c_buf_p "<=" to the position
+		 * of the first EOB in the buffer, since yy_c_buf_p will
+		 * already have been incremented past the NUL character
+		 * (since all states make transitions on EOB to the
+		 * end-of-buffer state).  Contrast this with the test
+		 * in input().
+		 */
+		if ( (yy_c_buf_p) <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
+			{ /* This was really a NUL. */
+			yy_state_type yy_next_state;
+
+			(yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text;
+
+			yy_current_state = yy_get_previous_state(  );
+
+			/* Okay, we're now positioned to make the NUL
+			 * transition.  We couldn't have
+			 * yy_get_previous_state() go ahead and do it
+			 * for us because it doesn't know how to deal
+			 * with the possibility of jamming (and we don't
+			 * want to build jamming into it because then it
+			 * will run more slowly).
+			 */
+
+			yy_next_state = yy_try_NUL_trans( yy_current_state );
+
+			yy_bp = (yytext_ptr) + YY_MORE_ADJ;
+
+			if ( yy_next_state )
+				{
+				/* Consume the NUL. */
+				yy_cp = ++(yy_c_buf_p);
+				yy_current_state = yy_next_state;
+				goto yy_match;
+				}
+
+			else
+				{
+/* %% [14.0] code to do back-up for compressed tables and set up yy_cp goes here */
+				yy_cp = (yy_last_accepting_cpos);
+				yy_current_state = (yy_last_accepting_state);
+				goto yy_find_action;
+				}
+			}
+
+		else switch ( yy_get_next_buffer(  ) )
+			{
+			case EOB_ACT_END_OF_FILE:
+				{
+				(yy_did_buffer_switch_on_eof) = 0;
+
+				if ( yywrap(  ) )
+					{
+					/* Note: because we've taken care in
+					 * yy_get_next_buffer() to have set up
+					 * yytext, we can now set up
+					 * yy_c_buf_p so that if some total
+					 * hoser (like flex itself) wants to
+					 * call the scanner after we return the
+					 * YY_NULL, it'll still work - another
+					 * YY_NULL will get returned.
+					 */
+					(yy_c_buf_p) = (yytext_ptr) + YY_MORE_ADJ;
+
+					yy_act = YY_STATE_EOF(YY_START);
+					goto do_action;
+					}
+
+				else
+					{
+					if ( ! (yy_did_buffer_switch_on_eof) )
+						YY_NEW_FILE;
+					}
+				break;
+				}
+
+			case EOB_ACT_CONTINUE_SCAN:
+				(yy_c_buf_p) =
+					(yytext_ptr) + yy_amount_of_matched_text;
+
+				yy_current_state = yy_get_previous_state(  );
+
+				yy_cp = (yy_c_buf_p);
+				yy_bp = (yytext_ptr) + YY_MORE_ADJ;
+				goto yy_match;
+
+			case EOB_ACT_LAST_MATCH:
+				(yy_c_buf_p) =
+				&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)];
+
+				yy_current_state = yy_get_previous_state(  );
+
+				yy_cp = (yy_c_buf_p);
+				yy_bp = (yytext_ptr) + YY_MORE_ADJ;
+				goto yy_find_action;
+			}
+		break;
+		}
+
+	default:
+		YY_FATAL_ERROR(
+			"fatal flex scanner internal error--no action found" );
+	} /* end of action switch */
+		} /* end of scanning one token */
+	} /* end of user's declarations */
+} /* end of yylex */
+/* %ok-for-header */
+
+/* %if-c++-only */
+/* %not-for-header */
+/* %ok-for-header */
+
+/* %endif */
+
+/* yy_get_next_buffer - try to read in a new buffer
+ *
+ * Returns a code representing an action:
+ *	EOB_ACT_LAST_MATCH -
+ *	EOB_ACT_CONTINUE_SCAN - continue scanning from current position
+ *	EOB_ACT_END_OF_FILE - end of file
+ */
+/* %if-c-only */
+static int yy_get_next_buffer (void)
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    	char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf;
+	char *source = (yytext_ptr);
+	int number_to_move, i;
+	int ret_val;
+
+	if ( (yy_c_buf_p) > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] )
+		YY_FATAL_ERROR(
+		"fatal flex scanner internal error--end of buffer missed" );
+
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 )
+		{ /* Don't try to fill the buffer, so this is an EOF. */
+		if ( (yy_c_buf_p) - (yytext_ptr) - YY_MORE_ADJ == 1 )
+			{
+			/* We matched a single character, the EOB, so
+			 * treat this as a final EOF.
+			 */
+			return EOB_ACT_END_OF_FILE;
+			}
+
+		else
+			{
+			/* We matched some text prior to the EOB, first
+			 * process it.
+			 */
+			return EOB_ACT_LAST_MATCH;
+			}
+		}
+
+	/* Try to read more data. */
+
+	/* First move last chars to start of buffer. */
+	number_to_move = (int) ((yy_c_buf_p) - (yytext_ptr) - 1);
+
+	for ( i = 0; i < number_to_move; ++i )
+		*(dest++) = *(source++);
+
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING )
+		/* don't do the read, it's not guaranteed to return an EOF,
+		 * just force an EOF
+		 */
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars) = 0;
+
+	else
+		{
+			int num_to_read =
+			YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1;
+
+		while ( num_to_read <= 0 )
+			{ /* Not enough room in the buffer - grow it. */
+
+			/* just a shorter name for the current buffer */
+			YY_BUFFER_STATE b = YY_CURRENT_BUFFER_LVALUE;
+
+			int yy_c_buf_p_offset =
+				(int) ((yy_c_buf_p) - b->yy_ch_buf);
+
+			if ( b->yy_is_our_buffer )
+				{
+				int new_size = b->yy_buf_size * 2;
+
+				if ( new_size <= 0 )
+					b->yy_buf_size += b->yy_buf_size / 8;
+				else
+					b->yy_buf_size *= 2;
+
+				b->yy_ch_buf = (char *)
+					/* Include room in for 2 EOB chars. */
+					yyrealloc( (void *) b->yy_ch_buf,
+							 (yy_size_t) (b->yy_buf_size + 2)  );
+				}
+			else
+				/* Can't grow it, we don't own it. */
+				b->yy_ch_buf = NULL;
+
+			if ( ! b->yy_ch_buf )
+				YY_FATAL_ERROR(
+				"fatal error - scanner input buffer overflow" );
+
+			(yy_c_buf_p) = &b->yy_ch_buf[yy_c_buf_p_offset];
+
+			num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size -
+						number_to_move - 1;
+
+			}
+
+		if ( num_to_read > YY_READ_BUF_SIZE )
+			num_to_read = YY_READ_BUF_SIZE;
+
+		/* Read in more data. */
+		YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]),
+			(yy_n_chars), num_to_read );
+
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
+		}
+
+	if ( (yy_n_chars) == 0 )
+		{
+		if ( number_to_move == YY_MORE_ADJ )
+			{
+			ret_val = EOB_ACT_END_OF_FILE;
+			yyrestart( yyin  );
+			}
+
+		else
+			{
+			ret_val = EOB_ACT_LAST_MATCH;
+			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =
+				YY_BUFFER_EOF_PENDING;
+			}
+		}
+
+	else
+		ret_val = EOB_ACT_CONTINUE_SCAN;
+
+	if (((yy_n_chars) + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) {
+		/* Extend the array by 50%, plus the number we really need. */
+		int new_size = (yy_n_chars) + number_to_move + ((yy_n_chars) >> 1);
+		YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) yyrealloc(
+			(void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf, (yy_size_t) new_size  );
+		if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
+			YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" );
+		/* "- 2" to take care of EOB's */
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_size = (int) (new_size - 2);
+	}
+
+	(yy_n_chars) += number_to_move;
+	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] = YY_END_OF_BUFFER_CHAR;
+	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] = YY_END_OF_BUFFER_CHAR;
+
+	(yytext_ptr) = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0];
+
+	return ret_val;
+}
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+/* %if-c-only */
+/* %not-for-header */
+    static yy_state_type yy_get_previous_state (void)
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+	yy_state_type yy_current_state;
+	char *yy_cp;
+    
+/* %% [15.0] code to get the start state into yy_current_state goes here */
+	yy_current_state = (yy_start);
+
+	for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp )
+		{
+/* %% [16.0] code to find the next state goes here */
+		YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
+		if ( yy_accept[yy_current_state] )
+			{
+			(yy_last_accepting_state) = yy_current_state;
+			(yy_last_accepting_cpos) = yy_cp;
+			}
+		while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+			{
+			yy_current_state = (int) yy_def[yy_current_state];
+			if ( yy_current_state >= 279 )
+				yy_c = yy_meta[yy_c];
+			}
+		yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
+		}
+
+	return yy_current_state;
+}
+
+/* yy_try_NUL_trans - try to make a transition on the NUL character
+ *
+ * synopsis
+ *	next_state = yy_try_NUL_trans( current_state );
+ */
+/* %if-c-only */
+    static yy_state_type yy_try_NUL_trans  (yy_state_type yy_current_state )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+	int yy_is_jam;
+    /* %% [17.0] code to find the next state, and perhaps do backing up, goes here */
+	char *yy_cp = (yy_c_buf_p);
+
+	YY_CHAR yy_c = 1;
+	if ( yy_accept[yy_current_state] )
+		{
+		(yy_last_accepting_state) = yy_current_state;
+		(yy_last_accepting_cpos) = yy_cp;
+		}
+	while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+		{
+		yy_current_state = (int) yy_def[yy_current_state];
+		if ( yy_current_state >= 279 )
+			yy_c = yy_meta[yy_c];
+		}
+	yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
+	yy_is_jam = (yy_current_state == 278);
+
+		return yy_is_jam ? 0 : yy_current_state;
+}
+
+#ifndef YY_NO_UNPUT
+/* %if-c-only */
+
+/* %endif */
+#endif
+
+/* %if-c-only */
+#ifndef YY_NO_INPUT
+#ifdef __cplusplus
+    static int yyinput (void)
+#else
+    static int input  (void)
+#endif
+
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+	int c;
+    
+	*(yy_c_buf_p) = (yy_hold_char);
+
+	if ( *(yy_c_buf_p) == YY_END_OF_BUFFER_CHAR )
+		{
+		/* yy_c_buf_p now points to the character we want to return.
+		 * If this occurs *before* the EOB characters, then it's a
+		 * valid NUL; if not, then we've hit the end of the buffer.
+		 */
+		if ( (yy_c_buf_p) < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
+			/* This was really a NUL. */
+			*(yy_c_buf_p) = '\0';
+
+		else
+			{ /* need more input */
+			int offset = (int) ((yy_c_buf_p) - (yytext_ptr));
+			++(yy_c_buf_p);
+
+			switch ( yy_get_next_buffer(  ) )
+				{
+				case EOB_ACT_LAST_MATCH:
+					/* This happens because yy_g_n_b()
+					 * sees that we've accumulated a
+					 * token and flags that we need to
+					 * try matching the token before
+					 * proceeding.  But for input(),
+					 * there's no matching to consider.
+					 * So convert the EOB_ACT_LAST_MATCH
+					 * to EOB_ACT_END_OF_FILE.
+					 */
+
+					/* Reset buffer status. */
+					yyrestart( yyin );
+
+					/*FALLTHROUGH*/
+
+				case EOB_ACT_END_OF_FILE:
+					{
+					if ( yywrap(  ) )
+						return 0;
+
+					if ( ! (yy_did_buffer_switch_on_eof) )
+						YY_NEW_FILE;
+#ifdef __cplusplus
+					return yyinput();
+#else
+					return input();
+#endif
+					}
+
+				case EOB_ACT_CONTINUE_SCAN:
+					(yy_c_buf_p) = (yytext_ptr) + offset;
+					break;
+				}
+			}
+		}
+
+	c = *(unsigned char *) (yy_c_buf_p);	/* cast for 8-bit char's */
+	*(yy_c_buf_p) = '\0';	/* preserve yytext */
+	(yy_hold_char) = *++(yy_c_buf_p);
+
+/* %% [19.0] update BOL and yylineno */
+	if ( c == '\n' )
+		
+    yylineno++;
+;
+
+	return c;
+}
+/* %if-c-only */
+#endif	/* ifndef YY_NO_INPUT */
+/* %endif */
+
+/** Immediately switch to a different input stream.
+ * @param input_file A readable stream.
+ * 
+ * @note This function does not reset the start condition to @c INITIAL .
+ */
+/* %if-c-only */
+    void yyrestart  (FILE * input_file )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    
+	if ( ! YY_CURRENT_BUFFER ){
+        yyensure_buffer_stack ();
+		YY_CURRENT_BUFFER_LVALUE =
+            yy_create_buffer( yyin, YY_BUF_SIZE );
+	}
+
+	yy_init_buffer( YY_CURRENT_BUFFER, input_file );
+	yy_load_buffer_state(  );
+}
+
+/* %if-c++-only */
+/* %endif */
+
+/** Switch to a different input buffer.
+ * @param new_buffer The new input buffer.
+ * 
+ */
+/* %if-c-only */
+    void yy_switch_to_buffer  (YY_BUFFER_STATE  new_buffer )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    
+	/* TODO. We should be able to replace this entire function body
+	 * with
+	 *		yypop_buffer_state();
+	 *		yypush_buffer_state(new_buffer);
+     */
+	yyensure_buffer_stack ();
+	if ( YY_CURRENT_BUFFER == new_buffer )
+		return;
+
+	if ( YY_CURRENT_BUFFER )
+		{
+		/* Flush out information for old buffer. */
+		*(yy_c_buf_p) = (yy_hold_char);
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
+		}
+
+	YY_CURRENT_BUFFER_LVALUE = new_buffer;
+	yy_load_buffer_state(  );
+
+	/* We don't actually know whether we did this switch during
+	 * EOF (yywrap()) processing, but the only time this flag
+	 * is looked at is after yywrap() is called, so it's safe
+	 * to go ahead and always set it.
+	 */
+	(yy_did_buffer_switch_on_eof) = 1;
+}
+
+/* %if-c-only */
+static void yy_load_buffer_state  (void)
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    	(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+	(yytext_ptr) = (yy_c_buf_p) = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos;
+/* %if-c-only */
+	yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file;
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+	(yy_hold_char) = *(yy_c_buf_p);
+}
+
+/** Allocate and initialize an input buffer state.
+ * @param file A readable stream.
+ * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE.
+ * 
+ * @return the allocated buffer state.
+ */
+/* %if-c-only */
+    YY_BUFFER_STATE yy_create_buffer  (FILE * file, int  size )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+	YY_BUFFER_STATE b;
+    
+	b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state )  );
+	if ( ! b )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+	b->yy_buf_size = size;
+
+	/* yy_ch_buf has to be 2 characters longer than the size given because
+	 * we need to put in 2 end-of-buffer characters.
+	 */
+	b->yy_ch_buf = (char *) yyalloc( (yy_size_t) (b->yy_buf_size + 2)  );
+	if ( ! b->yy_ch_buf )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+	b->yy_is_our_buffer = 1;
+
+	yy_init_buffer( b, file );
+
+	return b;
+}
+
+/* %if-c++-only */
+/* %endif */
+
+/** Destroy the buffer.
+ * @param b a buffer created with yy_create_buffer()
+ * 
+ */
+/* %if-c-only */
+    void yy_delete_buffer (YY_BUFFER_STATE  b )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    
+	if ( ! b )
+		return;
+
+	if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */
+		YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0;
+
+	if ( b->yy_is_our_buffer )
+		yyfree( (void *) b->yy_ch_buf  );
+
+	yyfree( (void *) b  );
+}
+
+/* Initializes or reinitializes a buffer.
+ * This function is sometimes called more than once on the same buffer,
+ * such as during a yyrestart() or at EOF.
+ */
+/* %if-c-only */
+    static void yy_init_buffer  (YY_BUFFER_STATE  b, FILE * file )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+
+{
+	int oerrno = errno;
+    
+	yy_flush_buffer( b );
+
+/* %if-c-only */
+	b->yy_input_file = file;
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+	b->yy_fill_buffer = 1;
+
+    /* If b is the current buffer, then yy_init_buffer was _probably_
+     * called from yyrestart() or through yy_get_next_buffer.
+     * In that case, we don't want to reset the lineno or column.
+     */
+    if (b != YY_CURRENT_BUFFER){
+        b->yy_bs_lineno = 1;
+        b->yy_bs_column = 0;
+    }
+
+/* %if-c-only */
+
+        b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
+    
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+	errno = oerrno;
+}
+
+/** Discard all buffered characters. On the next scan, YY_INPUT will be called.
+ * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER.
+ * 
+ */
+/* %if-c-only */
+    void yy_flush_buffer (YY_BUFFER_STATE  b )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    	if ( ! b )
+		return;
+
+	b->yy_n_chars = 0;
+
+	/* We always need two end-of-buffer characters.  The first causes
+	 * a transition to the end-of-buffer state.  The second causes
+	 * a jam in that state.
+	 */
+	b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
+	b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;
+
+	b->yy_buf_pos = &b->yy_ch_buf[0];
+
+	b->yy_at_bol = 1;
+	b->yy_buffer_status = YY_BUFFER_NEW;
+
+	if ( b == YY_CURRENT_BUFFER )
+		yy_load_buffer_state(  );
+}
+
+/* %if-c-or-c++ */
+/** Pushes the new state onto the stack. The new state becomes
+ *  the current state. This function will allocate the stack
+ *  if necessary.
+ *  @param new_buffer The new state.
+ *  
+ */
+/* %if-c-only */
+void yypush_buffer_state (YY_BUFFER_STATE new_buffer )
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    	if (new_buffer == NULL)
+		return;
+
+	yyensure_buffer_stack();
+
+	/* This block is copied from yy_switch_to_buffer. */
+	if ( YY_CURRENT_BUFFER )
+		{
+		/* Flush out information for old buffer. */
+		*(yy_c_buf_p) = (yy_hold_char);
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
+		}
+
+	/* Only push if top exists. Otherwise, replace top. */
+	if (YY_CURRENT_BUFFER)
+		(yy_buffer_stack_top)++;
+	YY_CURRENT_BUFFER_LVALUE = new_buffer;
+
+	/* copied from yy_switch_to_buffer. */
+	yy_load_buffer_state(  );
+	(yy_did_buffer_switch_on_eof) = 1;
+}
+/* %endif */
+
+/* %if-c-or-c++ */
+/** Removes and deletes the top of the stack, if present.
+ *  The next element becomes the new top.
+ *  
+ */
+/* %if-c-only */
+void yypop_buffer_state (void)
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+    	if (!YY_CURRENT_BUFFER)
+		return;
+
+	yy_delete_buffer(YY_CURRENT_BUFFER );
+	YY_CURRENT_BUFFER_LVALUE = NULL;
+	if ((yy_buffer_stack_top) > 0)
+		--(yy_buffer_stack_top);
+
+	if (YY_CURRENT_BUFFER) {
+		yy_load_buffer_state(  );
+		(yy_did_buffer_switch_on_eof) = 1;
+	}
+}
+/* %endif */
+
+/* %if-c-or-c++ */
+/* Allocates the stack if it does not exist.
+ *  Guarantees space for at least one push.
+ */
+/* %if-c-only */
+static void yyensure_buffer_stack (void)
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+{
+	yy_size_t num_to_alloc;
+    
+	if (!(yy_buffer_stack)) {
+
+		/* First allocation is just for 2 elements, since we don't know if this
+		 * scanner will even need a stack. We use 2 instead of 1 to avoid an
+		 * immediate realloc on the next call.
+         */
+      num_to_alloc = 1; /* After all that talk, this was set to 1 anyways... */
+		(yy_buffer_stack) = (struct yy_buffer_state**)yyalloc
+								(num_to_alloc * sizeof(struct yy_buffer_state*)
+								);
+		if ( ! (yy_buffer_stack) )
+			YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" );
+
+		memset((yy_buffer_stack), 0, num_to_alloc * sizeof(struct yy_buffer_state*));
+
+		(yy_buffer_stack_max) = num_to_alloc;
+		(yy_buffer_stack_top) = 0;
+		return;
+	}
+
+	if ((yy_buffer_stack_top) >= ((yy_buffer_stack_max)) - 1){
+
+		/* Increase the buffer to prepare for a possible push. */
+		yy_size_t grow_size = 8 /* arbitrary grow size */;
+
+		num_to_alloc = (yy_buffer_stack_max) + grow_size;
+		(yy_buffer_stack) = (struct yy_buffer_state**)yyrealloc
+								((yy_buffer_stack),
+								num_to_alloc * sizeof(struct yy_buffer_state*)
+								);
+		if ( ! (yy_buffer_stack) )
+			YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" );
+
+		/* zero only the new slots.*/
+		memset((yy_buffer_stack) + (yy_buffer_stack_max), 0, grow_size * sizeof(struct yy_buffer_state*));
+		(yy_buffer_stack_max) = num_to_alloc;
+	}
+}
+/* %endif */
+
+/* %if-c-only */
+/** Setup the input buffer state to scan directly from a user-specified character buffer.
+ * @param base the character buffer
+ * @param size the size in bytes of the character buffer
+ * 
+ * @return the newly allocated buffer state object.
+ */
+YY_BUFFER_STATE yy_scan_buffer  (char * base, yy_size_t  size )
+{
+	YY_BUFFER_STATE b;
+    
+	if ( size < 2 ||
+	     base[size-2] != YY_END_OF_BUFFER_CHAR ||
+	     base[size-1] != YY_END_OF_BUFFER_CHAR )
+		/* They forgot to leave room for the EOB's. */
+		return NULL;
+
+	b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state )  );
+	if ( ! b )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_scan_buffer()" );
+
+	b->yy_buf_size = (int) (size - 2);	/* "- 2" to take care of EOB's */
+	b->yy_buf_pos = b->yy_ch_buf = base;
+	b->yy_is_our_buffer = 0;
+	b->yy_input_file = NULL;
+	b->yy_n_chars = b->yy_buf_size;
+	b->yy_is_interactive = 0;
+	b->yy_at_bol = 1;
+	b->yy_fill_buffer = 0;
+	b->yy_buffer_status = YY_BUFFER_NEW;
+
+	yy_switch_to_buffer( b  );
+
+	return b;
+}
+/* %endif */
+
+/* %if-c-only */
+/** Setup the input buffer state to scan a string. The next call to yylex() will
+ * scan from a @e copy of @a str.
+ * @param yystr a NUL-terminated string to scan
+ * 
+ * @return the newly allocated buffer state object.
+ * @note If you want to scan bytes that may contain NUL values, then use
+ *       yy_scan_bytes() instead.
+ */
+YY_BUFFER_STATE yy_scan_string (const char * yystr )
+{
+    
+	return yy_scan_bytes( yystr, (int) strlen(yystr) );
+}
+/* %endif */
+
+/* %if-c-only */
+/** Setup the input buffer state to scan the given bytes. The next call to yylex() will
+ * scan from a @e copy of @a bytes.
+ * @param yybytes the byte buffer to scan
+ * @param _yybytes_len the number of bytes in the buffer pointed to by @a bytes.
+ * 
+ * @return the newly allocated buffer state object.
+ */
+YY_BUFFER_STATE yy_scan_bytes  (const char * yybytes, int  _yybytes_len )
+{
+	YY_BUFFER_STATE b;
+	char *buf;
+	yy_size_t n;
+	int i;
+    
+	/* Get memory for full buffer, including space for trailing EOB's. */
+	n = (yy_size_t) (_yybytes_len + 2);
+	buf = (char *) yyalloc( n  );
+	if ( ! buf )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" );
+
+	for ( i = 0; i < _yybytes_len; ++i )
+		buf[i] = yybytes[i];
+
+	buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR;
+
+	b = yy_scan_buffer( buf, n );
+	if ( ! b )
+		YY_FATAL_ERROR( "bad buffer in yy_scan_bytes()" );
+
+	/* It's okay to grow etc. this buffer, and we should throw it
+	 * away when we're done.
+	 */
+	b->yy_is_our_buffer = 1;
+
+	return b;
+}
+/* %endif */
+
+#ifndef YY_EXIT_FAILURE
+#define YY_EXIT_FAILURE 2
+#endif
+
+/* %if-c-only */
+static void yynoreturn yy_fatal_error (const char* msg )
+{
+			fprintf( stderr, "%s\n", msg );
+	exit( YY_EXIT_FAILURE );
+}
+/* %endif */
+/* %if-c++-only */
+/* %endif */
+
+/* Redefine yyless() so it works in section 3 code. */
+
+#undef yyless
+#define yyless(n) \
+	do \
+		{ \
+		/* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+		yytext[yyleng] = (yy_hold_char); \
+		(yy_c_buf_p) = yytext + yyless_macro_arg; \
+		(yy_hold_char) = *(yy_c_buf_p); \
+		*(yy_c_buf_p) = '\0'; \
+		yyleng = yyless_macro_arg; \
+		} \
+	while ( 0 )
+
+/* Accessor  methods (get/set functions) to struct members. */
+
+/* %if-c-only */
+/* %if-reentrant */
+/* %endif */
+
+/** Get the current line number.
+ * 
+ */
+int yyget_lineno  (void)
+{
+    
+    return yylineno;
+}
+
+/** Get the input stream.
+ * 
+ */
+FILE *yyget_in  (void)
+{
+        return yyin;
+}
+
+/** Get the output stream.
+ * 
+ */
+FILE *yyget_out  (void)
+{
+        return yyout;
+}
+
+/** Get the length of the current token.
+ * 
+ */
+int yyget_leng  (void)
+{
+        return yyleng;
+}
+
+/** Get the current token.
+ * 
+ */
+
+char *yyget_text  (void)
+{
+        return yytext;
+}
+
+/* %if-reentrant */
+/* %endif */
+
+/** Set the current line number.
+ * @param _line_number line number
+ * 
+ */
+void yyset_lineno (int  _line_number )
+{
+    
+    yylineno = _line_number;
+}
+
+/** Set the input stream. This does not discard the current
+ * input buffer.
+ * @param _in_str A readable stream.
+ * 
+ * @see yy_switch_to_buffer
+ */
+void yyset_in (FILE *  _in_str )
+{
+        yyin = _in_str ;
+}
+
+void yyset_out (FILE *  _out_str )
+{
+        yyout = _out_str ;
+}
+
+int yyget_debug  (void)
+{
+        return yy_flex_debug;
+}
+
+void yyset_debug (int  _bdebug )
+{
+        yy_flex_debug = _bdebug ;
+}
+
+/* %endif */
+
+/* %if-reentrant */
+/* %if-bison-bridge */
+/* %endif */
+/* %endif if-c-only */
+
+/* %if-c-only */
+static int yy_init_globals (void)
+{
+        /* Initialization is the same as for the non-reentrant scanner.
+     * This function is called from yylex_destroy(), so don't allocate here.
+     */
+
+    /* We do not touch yylineno unless the option is enabled. */
+    yylineno =  1;
+    
+    (yy_buffer_stack) = NULL;
+    (yy_buffer_stack_top) = 0;
+    (yy_buffer_stack_max) = 0;
+    (yy_c_buf_p) = NULL;
+    (yy_init) = 0;
+    (yy_start) = 0;
+
+/* Defined in main.c */
+#ifdef YY_STDINIT
+    yyin = stdin;
+    yyout = stdout;
+#else
+    yyin = NULL;
+    yyout = NULL;
+#endif
+
+    /* For future reference: Set errno on error, since we are called by
+     * yylex_init()
+     */
+    return 0;
+}
+/* %endif */
+
+/* %if-c-only SNIP! this currently causes conflicts with the c++ scanner */
+/* yylex_destroy is for both reentrant and non-reentrant scanners. */
+int yylex_destroy  (void)
+{
+    
+    /* Pop the buffer stack, destroying each element. */
+	while(YY_CURRENT_BUFFER){
+		yy_delete_buffer( YY_CURRENT_BUFFER  );
+		YY_CURRENT_BUFFER_LVALUE = NULL;
+		yypop_buffer_state();
+	}
+
+	/* Destroy the stack itself. */
+	yyfree((yy_buffer_stack) );
+	(yy_buffer_stack) = NULL;
+
+    /* Reset the globals. This is important in a non-reentrant scanner so the next time
+     * yylex() is called, initialization will occur. */
+    yy_init_globals( );
+
+/* %if-reentrant */
+/* %endif */
+    return 0;
+}
+/* %endif */
+
+/*
+ * Internal utility routines.
+ */
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char* s1, const char * s2, int n )
+{
+		
+	int i;
+	for ( i = 0; i < n; ++i )
+		s1[i] = s2[i];
+}
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (const char * s )
+{
+	int n;
+	for ( n = 0; s[n]; ++n )
+		;
+
+	return n;
+}
+#endif
+
+void *yyalloc (yy_size_t  size )
+{
+			return malloc(size);
+}
+
+void *yyrealloc  (void * ptr, yy_size_t  size )
+{
+		
+	/* The cast to (char *) in the following accommodates both
+	 * implementations that use char* generic pointers, and those
+	 * that use void* generic pointers.  It works with the latter
+	 * because both ANSI C and C++ allow castless assignment from
+	 * any pointer type to void*, and deal with argument conversions
+	 * as though doing an assignment.
+	 */
+	return realloc(ptr, size);
+}
+
+void yyfree (void * ptr )
+{
+			free( (char *) ptr );	/* see yyrealloc() for (char *) cast */
+}
+
+/* %if-tables-serialization definitions */
+/* %define-yytables   The name for this specific scanner's tables. */
+#define YYTABLES_NAME "yytables"
+/* %endif */
+
+/* %ok-for-header */
+
+#line 245 "lexer.ll"
+
+
+using namespace isc::eval;
+
+void
+EvalContext::scanStringBegin(ParserType type)
+{
+    start_token_flag = true;
+    start_token_value = type;
+
+    loc.initialize(&file_);
+    eval_flex_debug = trace_scanning_;
+    YY_BUFFER_STATE buffer;
+    buffer = eval_scan_bytes(string_.c_str(), string_.size());
+    if (!buffer) {
+        fatal("cannot scan string");
+        /* fatal() throws an exception so this can't be reached */
+    }
+}
+
+void
+EvalContext::scanStringEnd()
+{
+    eval_delete_buffer(YY_CURRENT_BUFFER);
+}
+
+namespace {
+/** To avoid unused function error */
+class Dummy {
+    /* cppcheck-suppress unusedPrivateFunction */
+    void dummy() { yy_fatal_error("Fix me: how to disable its definition?"); }
+};
+}
+#endif /* !__clang_analyzer__ */
+
diff --git a/src/lib/eval/lexer.ll b/src/lib/eval/lexer.ll
new file mode 100644
index 0000000..3c376c2
--- /dev/null
+++ b/src/lib/eval/lexer.ll
@@ -0,0 +1,277 @@
+/* Copyright (C) 2015-2022 Internet Systems Consortium, Inc. ("ISC")
+
+   This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+%{ /* -*- C++ -*- */
+
+/* Generated files do not make clang static analyser so happy */
+#ifndef __clang_analyzer__
+
+#include <cerrno>
+#include <climits>
+#include <cstdlib>
+#include <string>
+#include <eval/eval_context.h>
+#include <eval/parser.h>
+#include <asiolink/io_address.h>
+#include <boost/lexical_cast.hpp>
+
+/* Please avoid C++ style comments (// ... eol) as they break flex 2.6.2 */
+
+/* Work around an incompatibility in flex (at least versions
+   2.5.31 through 2.5.33): it generates code that does
+   not conform to C89.  See Debian bug 333231
+   <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
+# undef yywrap
+# define yywrap() 1
+
+/* The location of the current token. The lexer will keep updating it. This
+   variable will be useful for logging errors. */
+static isc::eval::location loc;
+
+namespace {
+    bool start_token_flag = false;
+    isc::eval::EvalContext::ParserType start_token_value;
+};
+
+/* To avoid the call to exit... oops! */
+#define YY_FATAL_ERROR(msg) isc::eval::EvalContext::fatal(msg)
+%}
+
+/* noyywrap disables automatic rewinding for the next file to parse. Since we
+   always parse only a single string, there's no need to do any wraps. And
+   using yywrap requires linking with -lfl, which provides the default yywrap
+   implementation that always returns 1 anyway. */
+%option noyywrap
+
+/* nounput simplifies the lexer, by removing support for putting a character
+   back into the input stream. We never use such capability anyway. */
+%option nounput
+
+/* batch means that we'll never use the generated lexer interactively. */
+%option batch
+
+/* Enables debug mode. To see the debug messages, one needs to also set
+   eval_flex_debug to 1, then the debug messages will be printed on stderr. */
+%option debug
+
+/* I have no idea what this option does, except it was specified in the bison
+   examples and Postgres folks added it to remove gcc 4.3 warnings. Let's
+   be on the safe side and keep it. */
+%option noinput
+
+/* This line tells flex to track the line numbers. It's not really that
+   useful for client classes, which typically are one-liners, but it may be
+   useful in more complex cases. */
+%option yylineno
+
+/* These are not token expressions yet, just convenience expressions that
+   can be used during actual token definitions. Note some can match
+   incorrect inputs (e.g., IP addresses) which must be checked. */
+int   \-?[0-9]+
+hex   [0-9a-fA-F]+
+blank [ \t]
+addr4 [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+
+addr6 [0-9a-fA-F]*\:[0-9a-fA-F]*\:[0-9a-fA-F:.]*
+
+%{
+/* This code run each time a pattern is matched. It updates the location
+   by moving it ahead by yyleng bytes. yyleng specifies the length of the
+   currently matched token. */
+#define YY_USER_ACTION  loc.columns(evalleng);
+%}
+
+%%
+
+%{
+    /* Code run each time evallex is called. */
+    loc.step();
+
+    if (start_token_flag) {
+        start_token_flag = false;
+        switch (start_token_value) {
+        case EvalContext::PARSER_BOOL:
+            return isc::eval::EvalParser::make_TOPLEVEL_BOOL(loc);
+        default:
+        case EvalContext::PARSER_STRING:
+            return isc::eval::EvalParser::make_TOPLEVEL_STRING(loc);
+        }
+    }
+
+%}
+
+{blank}+   {
+    /* Ok, we found a with space. Let's ignore it and update loc variable. */
+    loc.step();
+}
+
+[\n]+      {
+    /* Newline found. Let's update the location and continue. */
+    loc.lines(evalleng);
+    loc.step();
+}
+
+\'[^\'\n]*\' {
+    /* A string has been matched. It contains the actual string and single quotes.
+       We need to get those quotes out of the way and just use its content, e.g.
+       for 'foo' we should get foo */
+    std::string tmp(evaltext+1);
+    tmp.resize(tmp.size() - 1);
+
+    return isc::eval::EvalParser::make_STRING(tmp, loc);
+}
+
+0[xX]{hex} {
+    /* A hex string has been matched. It contains the '0x' or '0X' header
+       followed by at least one hexadecimal digit. */
+    return isc::eval::EvalParser::make_HEXSTRING(evaltext, loc);
+}
+
+{int} {
+    /* An integer was found. */
+    std::string tmp(evaltext);
+
+    try {
+        /* In substring we want to use negative values (e.g. -1).
+           In enterprise-id we need to use values up to 0xffffffff.
+           To cover both of those use cases, we need at least
+           int64_t. */
+        static_cast<void>(boost::lexical_cast<int64_t>(tmp));
+    } catch (const boost::bad_lexical_cast &) {
+        driver.error(loc, "Failed to convert " + tmp + " to an integer.");
+    }
+
+    /* The parser needs the string form as double conversion is no lossless */
+    return isc::eval::EvalParser::make_INTEGER(tmp, loc);
+}
+
+[A-Za-z]([-_A-Za-z0-9]*[A-Za-z0-9])?({blank}|\n)*/] {
+    /* This string specifies option name starting with a letter
+       and further containing letters, digits, hyphens and
+       underscores and finishing by letters or digits. */
+    /* Moved from a variable trailing context to C++ code as it was too slow */
+    std::string tmp(evaltext);
+    /* remove possible trailing blanks or newlines */
+    while (tmp.size() > 1) {
+        char last = tmp[tmp.size() - 1];
+        if ((last != ' ') && (last != '\t') && (last != '\n')) {
+            break;
+        }
+        if (last == '\n') {
+            /* Take embedded newlines into account */
+            /* Can make it more complex to handle spaces after the last
+               newline but currently keep it simple... */
+            loc.lines();
+            loc.step();
+        }
+        tmp.resize(tmp.size() - 1);
+    }
+    return isc::eval::EvalParser::make_OPTION_NAME(tmp, loc);
+}
+
+{addr4}|{addr6} {
+    /* IPv4 or IPv6 address */
+    std::string tmp(evaltext);
+
+    /* Some incorrect addresses can match so we have to check. */
+    try {
+        isc::asiolink::IOAddress ip(tmp);
+    } catch (...) {
+        driver.error(loc, "Failed to convert " + tmp + " to an IP address.");
+    }
+
+    return isc::eval::EvalParser::make_IP_ADDRESS(evaltext, loc);
+}
+
+"=="           return isc::eval::EvalParser::make_EQUAL(loc);
+"option"       return isc::eval::EvalParser::make_OPTION(loc);
+"relay4"       return isc::eval::EvalParser::make_RELAY4(loc);
+"relay6"       return isc::eval::EvalParser::make_RELAY6(loc);
+"peeraddr"     return isc::eval::EvalParser::make_PEERADDR(loc);
+"linkaddr"     return isc::eval::EvalParser::make_LINKADDR(loc);
+"text"         return isc::eval::EvalParser::make_TEXT(loc);
+"hex"          return isc::eval::EvalParser::make_HEX(loc);
+"exists"       return isc::eval::EvalParser::make_EXISTS(loc);
+"pkt"          return isc::eval::EvalParser::make_PKT(loc);
+"iface"        return isc::eval::EvalParser::make_IFACE(loc);
+"src"          return isc::eval::EvalParser::make_SRC(loc);
+"dst"          return isc::eval::EvalParser::make_DST(loc);
+"len"          return isc::eval::EvalParser::make_LEN(loc);
+"pkt4"         return isc::eval::EvalParser::make_PKT4(loc);
+"mac"          return isc::eval::EvalParser::make_CHADDR(loc);
+"hlen"         return isc::eval::EvalParser::make_HLEN(loc);
+"htype"        return isc::eval::EvalParser::make_HTYPE(loc);
+"ciaddr"       return isc::eval::EvalParser::make_CIADDR(loc);
+"giaddr"       return isc::eval::EvalParser::make_GIADDR(loc);
+"yiaddr"       return isc::eval::EvalParser::make_YIADDR(loc);
+"siaddr"       return isc::eval::EvalParser::make_SIADDR(loc);
+"pkt6"         return isc::eval::EvalParser::make_PKT6(loc);
+"msgtype"      return isc::eval::EvalParser::make_MSGTYPE(loc);
+"transid"      return isc::eval::EvalParser::make_TRANSID(loc);
+"vendor"       return isc::eval::EvalParser::make_VENDOR(loc);
+"vendor-class" return isc::eval::EvalParser::make_VENDOR_CLASS(loc);
+"data"         return isc::eval::EvalParser::make_DATA(loc);
+"enterprise"   return isc::eval::EvalParser::make_ENTERPRISE(loc);
+"substring"    return isc::eval::EvalParser::make_SUBSTRING(loc);
+"split"        return isc::eval::EvalParser::make_SPLIT(loc);
+"all"          return isc::eval::EvalParser::make_ALL(loc);
+"concat"       return isc::eval::EvalParser::make_CONCAT(loc);
+"ifelse"       return isc::eval::EvalParser::make_IFELSE(loc);
+"hexstring"    return isc::eval::EvalParser::make_TOHEXSTRING(loc);
+"addrtotext"   return isc::eval::EvalParser::make_ADDRTOTEXT(loc);
+"int8totext"   return isc::eval::EvalParser::make_INT8TOTEXT(loc);
+"int16totext"  return isc::eval::EvalParser::make_INT16TOTEXT(loc);
+"int32totext"  return isc::eval::EvalParser::make_INT32TOTEXT(loc);
+"uint8totext"  return isc::eval::EvalParser::make_UINT8TOTEXT(loc);
+"uint16totext" return isc::eval::EvalParser::make_UINT16TOTEXT(loc);
+"uint32totext" return isc::eval::EvalParser::make_UINT32TOTEXT(loc);
+"not"          return isc::eval::EvalParser::make_NOT(loc);
+"and"          return isc::eval::EvalParser::make_AND(loc);
+"or"           return isc::eval::EvalParser::make_OR(loc);
+"member"       return isc::eval::EvalParser::make_MEMBER(loc);
+"."            return isc::eval::EvalParser::make_DOT(loc);
+"("            return isc::eval::EvalParser::make_LPAREN(loc);
+")"            return isc::eval::EvalParser::make_RPAREN(loc);
+"["            return isc::eval::EvalParser::make_LBRACKET(loc);
+"]"            return isc::eval::EvalParser::make_RBRACKET(loc);
+","            return isc::eval::EvalParser::make_COMA(loc);
+"*"            return isc::eval::EvalParser::make_ANY(loc);
+"+"            return isc::eval::EvalParser::make_PLUS(loc);
+.          driver.error (loc, "Invalid character: " + std::string(evaltext));
+<<EOF>>    return isc::eval::EvalParser::make_END(loc);
+%%
+
+using namespace isc::eval;
+
+void
+EvalContext::scanStringBegin(ParserType type)
+{
+    start_token_flag = true;
+    start_token_value = type;
+
+    loc.initialize(&file_);
+    eval_flex_debug = trace_scanning_;
+    YY_BUFFER_STATE buffer;
+    buffer = eval_scan_bytes(string_.c_str(), string_.size());
+    if (!buffer) {
+        fatal("cannot scan string");
+        /* fatal() throws an exception so this can't be reached */
+    }
+}
+
+void
+EvalContext::scanStringEnd()
+{
+    eval_delete_buffer(YY_CURRENT_BUFFER);
+}
+
+namespace {
+/** To avoid unused function error */
+class Dummy {
+    /* cppcheck-suppress unusedPrivateFunction */
+    void dummy() { yy_fatal_error("Fix me: how to disable its definition?"); }
+};
+}
+#endif /* !__clang_analyzer__ */
diff --git a/src/lib/eval/location.hh b/src/lib/eval/location.hh
new file mode 100644
index 0000000..5bde479
--- /dev/null
+++ b/src/lib/eval/location.hh
@@ -0,0 +1,306 @@
+// A Bison parser, made by GNU Bison 3.8.2.
+
+// Locations for Bison parsers in C++
+
+// Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// As a special exception, you may create a larger work that contains
+// part or all of the Bison parser skeleton and distribute that work
+// under terms of your choice, so long as that work isn't itself a
+// parser generator using the skeleton or a modified version thereof
+// as a parser skeleton.  Alternatively, if you modify or redistribute
+// the parser skeleton itself, you may (at your option) remove this
+// special exception, which will cause the skeleton and the resulting
+// Bison output files to be licensed under the GNU General Public
+// License without this special exception.
+
+// This special exception was added by the Free Software Foundation in
+// version 2.2 of Bison.
+
+/**
+ ** \file location.hh
+ ** Define the isc::eval::location class.
+ */
+
+#ifndef YY_EVAL_LOCATION_HH_INCLUDED
+# define YY_EVAL_LOCATION_HH_INCLUDED
+
+# include <iostream>
+# include <string>
+
+# ifndef YY_NULLPTR
+#  if defined __cplusplus
+#   if 201103L <= __cplusplus
+#    define YY_NULLPTR nullptr
+#   else
+#    define YY_NULLPTR 0
+#   endif
+#  else
+#   define YY_NULLPTR ((void*)0)
+#  endif
+# endif
+
+#line 14 "parser.yy"
+namespace isc { namespace eval {
+#line 59 "location.hh"
+
+  /// A point in a source file.
+  class position
+  {
+  public:
+    /// Type for file name.
+    typedef const std::string filename_type;
+    /// Type for line and column numbers.
+    typedef int counter_type;
+
+    /// Construct a position.
+    explicit position (filename_type* f = YY_NULLPTR,
+                       counter_type l = 1,
+                       counter_type c = 1)
+      : filename (f)
+      , line (l)
+      , column (c)
+    {}
+
+
+    /// Initialization.
+    void initialize (filename_type* fn = YY_NULLPTR,
+                     counter_type l = 1,
+                     counter_type c = 1)
+    {
+      filename = fn;
+      line = l;
+      column = c;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+    /// (line related) Advance to the COUNT next lines.
+    void lines (counter_type count = 1)
+    {
+      if (count)
+        {
+          column = 1;
+          line = add_ (line, count, 1);
+        }
+    }
+
+    /// (column related) Advance to the COUNT next columns.
+    void columns (counter_type count = 1)
+    {
+      column = add_ (column, count, 1);
+    }
+    /** \} */
+
+    /// File name to which this position refers.
+    filename_type* filename;
+    /// Current line number.
+    counter_type line;
+    /// Current column number.
+    counter_type column;
+
+  private:
+    /// Compute max (min, lhs+rhs).
+    static counter_type add_ (counter_type lhs, counter_type rhs, counter_type min)
+    {
+      return lhs + rhs < min ? min : lhs + rhs;
+    }
+  };
+
+  /// Add \a width columns, in place.
+  inline position&
+  operator+= (position& res, position::counter_type width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns.
+  inline position
+  operator+ (position res, position::counter_type width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns, in place.
+  inline position&
+  operator-= (position& res, position::counter_type width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns.
+  inline position
+  operator- (position res, position::counter_type width)
+  {
+    return res -= width;
+  }
+
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param pos a reference to the position to redirect
+   */
+  template <typename YYChar>
+  std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
+  {
+    if (pos.filename)
+      ostr << *pos.filename << ':';
+    return ostr << pos.line << '.' << pos.column;
+  }
+
+  /// Two points in a source file.
+  class location
+  {
+  public:
+    /// Type for file name.
+    typedef position::filename_type filename_type;
+    /// Type for line and column numbers.
+    typedef position::counter_type counter_type;
+
+    /// Construct a location from \a b to \a e.
+    location (const position& b, const position& e)
+      : begin (b)
+      , end (e)
+    {}
+
+    /// Construct a 0-width location in \a p.
+    explicit location (const position& p = position ())
+      : begin (p)
+      , end (p)
+    {}
+
+    /// Construct a 0-width location in \a f, \a l, \a c.
+    explicit location (filename_type* f,
+                       counter_type l = 1,
+                       counter_type c = 1)
+      : begin (f, l, c)
+      , end (f, l, c)
+    {}
+
+
+    /// Initialization.
+    void initialize (filename_type* f = YY_NULLPTR,
+                     counter_type l = 1,
+                     counter_type c = 1)
+    {
+      begin.initialize (f, l, c);
+      end = begin;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+  public:
+    /// Reset initial location to final location.
+    void step ()
+    {
+      begin = end;
+    }
+
+    /// Extend the current location to the COUNT next columns.
+    void columns (counter_type count = 1)
+    {
+      end += count;
+    }
+
+    /// Extend the current location to the COUNT next lines.
+    void lines (counter_type count = 1)
+    {
+      end.lines (count);
+    }
+    /** \} */
+
+
+  public:
+    /// Beginning of the located region.
+    position begin;
+    /// End of the located region.
+    position end;
+  };
+
+  /// Join two locations, in place.
+  inline location&
+  operator+= (location& res, const location& end)
+  {
+    res.end = end.end;
+    return res;
+  }
+
+  /// Join two locations.
+  inline location
+  operator+ (location res, const location& end)
+  {
+    return res += end;
+  }
+
+  /// Add \a width columns to the end position, in place.
+  inline location&
+  operator+= (location& res, location::counter_type width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns to the end position.
+  inline location
+  operator+ (location res, location::counter_type width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns to the end position, in place.
+  inline location&
+  operator-= (location& res, location::counter_type width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns to the end position.
+  inline location
+  operator- (location res, location::counter_type width)
+  {
+    return res -= width;
+  }
+
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param loc a reference to the location to redirect
+   **
+   ** Avoid duplicate information.
+   */
+  template <typename YYChar>
+  std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
+  {
+    location::counter_type end_col
+      = 0 < loc.end.column ? loc.end.column - 1 : 0;
+    ostr << loc.begin;
+    if (loc.end.filename
+        && (!loc.begin.filename
+            || *loc.begin.filename != *loc.end.filename))
+      ostr << '-' << loc.end.filename << ':' << loc.end.line << '.' << end_col;
+    else if (loc.begin.line < loc.end.line)
+      ostr << '-' << loc.end.line << '.' << end_col;
+    else if (loc.begin.column < end_col)
+      ostr << '-' << end_col;
+    return ostr;
+  }
+
+#line 14 "parser.yy"
+} } // isc::eval
+#line 305 "location.hh"
+
+#endif // !YY_EVAL_LOCATION_HH_INCLUDED
diff --git a/src/lib/eval/parser.cc b/src/lib/eval/parser.cc
new file mode 100644
index 0000000..e73d694
--- /dev/null
+++ b/src/lib/eval/parser.cc
@@ -0,0 +1,2227 @@
+// A Bison parser, made by GNU Bison 3.8.2.
+
+// Skeleton implementation for Bison LALR(1) parsers in C++
+
+// Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// As a special exception, you may create a larger work that contains
+// part or all of the Bison parser skeleton and distribute that work
+// under terms of your choice, so long as that work isn't itself a
+// parser generator using the skeleton or a modified version thereof
+// as a parser skeleton.  Alternatively, if you modify or redistribute
+// the parser skeleton itself, you may (at your option) remove this
+// special exception, which will cause the skeleton and the resulting
+// Bison output files to be licensed under the GNU General Public
+// License without this special exception.
+
+// This special exception was added by the Free Software Foundation in
+// version 2.2 of Bison.
+
+// DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
+// especially those whose name start with YY_ or yy_.  They are
+// private implementation details that can be changed or removed.
+
+
+// Take the name prefix into account.
+#define yylex   evallex
+
+
+
+#include "parser.h"
+
+
+// Unqualified %code blocks.
+#line 33 "parser.yy"
+
+# include "eval_context.h"
+
+// Avoid warnings with the error counter.
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
+
+#line 57 "parser.cc"
+
+
+#ifndef YY_
+# if defined YYENABLE_NLS && YYENABLE_NLS
+#  if ENABLE_NLS
+#   include <libintl.h> // FIXME: INFRINGES ON USER NAME SPACE.
+#   define YY_(msgid) dgettext ("bison-runtime", msgid)
+#  endif
+# endif
+# ifndef YY_
+#  define YY_(msgid) msgid
+# endif
+#endif
+
+
+// Whether we are compiled with exception support.
+#ifndef YY_EXCEPTIONS
+# if defined __GNUC__ && !defined __EXCEPTIONS
+#  define YY_EXCEPTIONS 0
+# else
+#  define YY_EXCEPTIONS 1
+# endif
+#endif
+
+#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
+/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+# ifndef YYLLOC_DEFAULT
+#  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
+    do                                                                  \
+      if (N)                                                            \
+        {                                                               \
+          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
+          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
+        }                                                               \
+    while (false)
+# endif
+
+
+// Enable debugging if requested.
+#if EVALDEBUG
+
+// A pseudo ostream that takes yydebug_ into account.
+# define YYCDEBUG if (yydebug_) (*yycdebug_)
+
+# define YY_SYMBOL_PRINT(Title, Symbol)         \
+  do {                                          \
+    if (yydebug_)                               \
+    {                                           \
+      *yycdebug_ << Title << ' ';               \
+      yy_print_ (*yycdebug_, Symbol);           \
+      *yycdebug_ << '\n';                       \
+    }                                           \
+  } while (false)
+
+# define YY_REDUCE_PRINT(Rule)          \
+  do {                                  \
+    if (yydebug_)                       \
+      yy_reduce_print_ (Rule);          \
+  } while (false)
+
+# define YY_STACK_PRINT()               \
+  do {                                  \
+    if (yydebug_)                       \
+      yy_stack_print_ ();                \
+  } while (false)
+
+#else // !EVALDEBUG
+
+# define YYCDEBUG if (false) std::cerr
+# define YY_SYMBOL_PRINT(Title, Symbol)  YY_USE (Symbol)
+# define YY_REDUCE_PRINT(Rule)           static_cast<void> (0)
+# define YY_STACK_PRINT()                static_cast<void> (0)
+
+#endif // !EVALDEBUG
+
+#define yyerrok         (yyerrstatus_ = 0)
+#define yyclearin       (yyla.clear ())
+
+#define YYACCEPT        goto yyacceptlab
+#define YYABORT         goto yyabortlab
+#define YYERROR         goto yyerrorlab
+#define YYRECOVERING()  (!!yyerrstatus_)
+
+#line 14 "parser.yy"
+namespace isc { namespace eval {
+#line 150 "parser.cc"
+
+  /// Build a parser object.
+  EvalParser::EvalParser (EvalContext& ctx_yyarg)
+#if EVALDEBUG
+    : yydebug_ (false),
+      yycdebug_ (&std::cerr),
+#else
+    :
+#endif
+      ctx (ctx_yyarg)
+  {}
+
+  EvalParser::~EvalParser ()
+  {}
+
+  EvalParser::syntax_error::~syntax_error () YY_NOEXCEPT YY_NOTHROW
+  {}
+
+  /*---------.
+  | symbol.  |
+  `---------*/
+
+
+
+  // by_state.
+  EvalParser::by_state::by_state () YY_NOEXCEPT
+    : state (empty_state)
+  {}
+
+  EvalParser::by_state::by_state (const by_state& that) YY_NOEXCEPT
+    : state (that.state)
+  {}
+
+  void
+  EvalParser::by_state::clear () YY_NOEXCEPT
+  {
+    state = empty_state;
+  }
+
+  void
+  EvalParser::by_state::move (by_state& that)
+  {
+    state = that.state;
+    that.clear ();
+  }
+
+  EvalParser::by_state::by_state (state_type s) YY_NOEXCEPT
+    : state (s)
+  {}
+
+  EvalParser::symbol_kind_type
+  EvalParser::by_state::kind () const YY_NOEXCEPT
+  {
+    if (state == empty_state)
+      return symbol_kind::S_YYEMPTY;
+    else
+      return YY_CAST (symbol_kind_type, yystos_[+state]);
+  }
+
+  EvalParser::stack_symbol_type::stack_symbol_type ()
+  {}
+
+  EvalParser::stack_symbol_type::stack_symbol_type (YY_RVREF (stack_symbol_type) that)
+    : super_type (YY_MOVE (that.state), YY_MOVE (that.location))
+  {
+    switch (that.kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.YY_MOVE_OR_COPY< TokenOption::RepresentationType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.YY_MOVE_OR_COPY< TokenPkt4::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.YY_MOVE_OR_COPY< TokenPkt6::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.YY_MOVE_OR_COPY< TokenPkt::MetadataType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.YY_MOVE_OR_COPY< TokenRelay6Field::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.YY_MOVE_OR_COPY< int8_t > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.YY_MOVE_OR_COPY< std::string > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.YY_MOVE_OR_COPY< uint16_t > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.YY_MOVE_OR_COPY< uint32_t > (YY_MOVE (that.value));
+        break;
+
+      default:
+        break;
+    }
+
+#if 201103L <= YY_CPLUSPLUS
+    // that is emptied.
+    that.state = empty_state;
+#endif
+  }
+
+  EvalParser::stack_symbol_type::stack_symbol_type (state_type s, YY_MOVE_REF (symbol_type) that)
+    : super_type (s, YY_MOVE (that.location))
+  {
+    switch (that.kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.move< TokenOption::RepresentationType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.move< TokenPkt4::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.move< TokenPkt6::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.move< TokenPkt::MetadataType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.move< TokenRelay6Field::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.move< int8_t > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.move< std::string > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.move< uint16_t > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.move< uint32_t > (YY_MOVE (that.value));
+        break;
+
+      default:
+        break;
+    }
+
+    // that is emptied.
+    that.kind_ = symbol_kind::S_YYEMPTY;
+  }
+
+#if YY_CPLUSPLUS < 201103L
+  EvalParser::stack_symbol_type&
+  EvalParser::stack_symbol_type::operator= (const stack_symbol_type& that)
+  {
+    state = that.state;
+    switch (that.kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.copy< TokenOption::RepresentationType > (that.value);
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.copy< TokenPkt4::FieldType > (that.value);
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.copy< TokenPkt6::FieldType > (that.value);
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.copy< TokenPkt::MetadataType > (that.value);
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.copy< TokenRelay6Field::FieldType > (that.value);
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.copy< int8_t > (that.value);
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.copy< std::string > (that.value);
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.copy< uint16_t > (that.value);
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.copy< uint32_t > (that.value);
+        break;
+
+      default:
+        break;
+    }
+
+    location = that.location;
+    return *this;
+  }
+
+  EvalParser::stack_symbol_type&
+  EvalParser::stack_symbol_type::operator= (stack_symbol_type& that)
+  {
+    state = that.state;
+    switch (that.kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.move< TokenOption::RepresentationType > (that.value);
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.move< TokenPkt4::FieldType > (that.value);
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.move< TokenPkt6::FieldType > (that.value);
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.move< TokenPkt::MetadataType > (that.value);
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.move< TokenRelay6Field::FieldType > (that.value);
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.move< int8_t > (that.value);
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.move< std::string > (that.value);
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.move< uint16_t > (that.value);
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.move< uint32_t > (that.value);
+        break;
+
+      default:
+        break;
+    }
+
+    location = that.location;
+    // that is emptied.
+    that.state = empty_state;
+    return *this;
+  }
+#endif
+
+  template <typename Base>
+  void
+  EvalParser::yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const
+  {
+    if (yymsg)
+      YY_SYMBOL_PRINT (yymsg, yysym);
+  }
+
+#if EVALDEBUG
+  template <typename Base>
+  void
+  EvalParser::yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const
+  {
+    std::ostream& yyoutput = yyo;
+    YY_USE (yyoutput);
+    if (yysym.empty ())
+      yyo << "empty symbol";
+    else
+      {
+        symbol_kind_type yykind = yysym.kind ();
+        yyo << (yykind < YYNTOKENS ? "token" : "nterm")
+            << ' ' << yysym.name () << " ("
+            << yysym.location << ": ";
+        switch (yykind)
+    {
+      case symbol_kind::S_STRING: // "constant string"
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < std::string > (); }
+#line 469 "parser.cc"
+        break;
+
+      case symbol_kind::S_INTEGER: // "integer"
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < std::string > (); }
+#line 475 "parser.cc"
+        break;
+
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < std::string > (); }
+#line 481 "parser.cc"
+        break;
+
+      case symbol_kind::S_OPTION_NAME: // "option name"
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < std::string > (); }
+#line 487 "parser.cc"
+        break;
+
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < std::string > (); }
+#line 493 "parser.cc"
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < uint32_t > (); }
+#line 499 "parser.cc"
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < uint16_t > (); }
+#line 505 "parser.cc"
+        break;
+
+      case symbol_kind::S_sub_option_code: // sub_option_code
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < uint16_t > (); }
+#line 511 "parser.cc"
+        break;
+
+      case symbol_kind::S_option_repr_type: // option_repr_type
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < TokenOption::RepresentationType > (); }
+#line 517 "parser.cc"
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < int8_t > (); }
+#line 523 "parser.cc"
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < TokenPkt::MetadataType > (); }
+#line 529 "parser.cc"
+        break;
+
+      case symbol_kind::S_enterprise_id: // enterprise_id
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < uint32_t > (); }
+#line 535 "parser.cc"
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < TokenPkt4::FieldType > (); }
+#line 541 "parser.cc"
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < TokenPkt6::FieldType > (); }
+#line 547 "parser.cc"
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+#line 127 "parser.yy"
+                 { yyoutput << yysym.value.template as < TokenRelay6Field::FieldType > (); }
+#line 553 "parser.cc"
+        break;
+
+      default:
+        break;
+    }
+        yyo << ')';
+      }
+  }
+#endif
+
+  void
+  EvalParser::yypush_ (const char* m, YY_MOVE_REF (stack_symbol_type) sym)
+  {
+    if (m)
+      YY_SYMBOL_PRINT (m, sym);
+    yystack_.push (YY_MOVE (sym));
+  }
+
+  void
+  EvalParser::yypush_ (const char* m, state_type s, YY_MOVE_REF (symbol_type) sym)
+  {
+#if 201103L <= YY_CPLUSPLUS
+    yypush_ (m, stack_symbol_type (s, std::move (sym)));
+#else
+    stack_symbol_type ss (s, sym);
+    yypush_ (m, ss);
+#endif
+  }
+
+  void
+  EvalParser::yypop_ (int n) YY_NOEXCEPT
+  {
+    yystack_.pop (n);
+  }
+
+#if EVALDEBUG
+  std::ostream&
+  EvalParser::debug_stream () const
+  {
+    return *yycdebug_;
+  }
+
+  void
+  EvalParser::set_debug_stream (std::ostream& o)
+  {
+    yycdebug_ = &o;
+  }
+
+
+  EvalParser::debug_level_type
+  EvalParser::debug_level () const
+  {
+    return yydebug_;
+  }
+
+  void
+  EvalParser::set_debug_level (debug_level_type l)
+  {
+    yydebug_ = l;
+  }
+#endif // EVALDEBUG
+
+  EvalParser::state_type
+  EvalParser::yy_lr_goto_state_ (state_type yystate, int yysym)
+  {
+    int yyr = yypgoto_[yysym - YYNTOKENS] + yystate;
+    if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
+      return yytable_[yyr];
+    else
+      return yydefgoto_[yysym - YYNTOKENS];
+  }
+
+  bool
+  EvalParser::yy_pact_value_is_default_ (int yyvalue) YY_NOEXCEPT
+  {
+    return yyvalue == yypact_ninf_;
+  }
+
+  bool
+  EvalParser::yy_table_value_is_error_ (int yyvalue) YY_NOEXCEPT
+  {
+    return yyvalue == yytable_ninf_;
+  }
+
+  int
+  EvalParser::operator() ()
+  {
+    return parse ();
+  }
+
+  int
+  EvalParser::parse ()
+  {
+    int yyn;
+    /// Length of the RHS of the rule being reduced.
+    int yylen = 0;
+
+    // Error handling.
+    int yynerrs_ = 0;
+    int yyerrstatus_ = 0;
+
+    /// The lookahead symbol.
+    symbol_type yyla;
+
+    /// The locations where the error started and ended.
+    stack_symbol_type yyerror_range[3];
+
+    /// The return value of parse ().
+    int yyresult;
+
+#if YY_EXCEPTIONS
+    try
+#endif // YY_EXCEPTIONS
+      {
+    YYCDEBUG << "Starting parse\n";
+
+
+    /* Initialize the stack.  The initial state will be set in
+       yynewstate, since the latter expects the semantical and the
+       location values to have been already stored, initialize these
+       stacks with a primary value.  */
+    yystack_.clear ();
+    yypush_ (YY_NULLPTR, 0, YY_MOVE (yyla));
+
+  /*-----------------------------------------------.
+  | yynewstate -- push a new symbol on the stack.  |
+  `-----------------------------------------------*/
+  yynewstate:
+    YYCDEBUG << "Entering state " << int (yystack_[0].state) << '\n';
+    YY_STACK_PRINT ();
+
+    // Accept?
+    if (yystack_[0].state == yyfinal_)
+      YYACCEPT;
+
+    goto yybackup;
+
+
+  /*-----------.
+  | yybackup.  |
+  `-----------*/
+  yybackup:
+    // Try to take a decision without lookahead.
+    yyn = yypact_[+yystack_[0].state];
+    if (yy_pact_value_is_default_ (yyn))
+      goto yydefault;
+
+    // Read a lookahead token.
+    if (yyla.empty ())
+      {
+        YYCDEBUG << "Reading a token\n";
+#if YY_EXCEPTIONS
+        try
+#endif // YY_EXCEPTIONS
+          {
+            symbol_type yylookahead (yylex (ctx));
+            yyla.move (yylookahead);
+          }
+#if YY_EXCEPTIONS
+        catch (const syntax_error& yyexc)
+          {
+            YYCDEBUG << "Caught exception: " << yyexc.what() << '\n';
+            error (yyexc);
+            goto yyerrlab1;
+          }
+#endif // YY_EXCEPTIONS
+      }
+    YY_SYMBOL_PRINT ("Next token is", yyla);
+
+    if (yyla.kind () == symbol_kind::S_YYerror)
+    {
+      // The scanner already issued an error message, process directly
+      // to error recovery.  But do not keep the error token as
+      // lookahead, it is too special and may lead us to an endless
+      // loop in error recovery. */
+      yyla.kind_ = symbol_kind::S_YYUNDEF;
+      goto yyerrlab1;
+    }
+
+    /* If the proper action on seeing token YYLA.TYPE is to reduce or
+       to detect an error, take that action.  */
+    yyn += yyla.kind ();
+    if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.kind ())
+      {
+        goto yydefault;
+      }
+
+    // Reduce or error.
+    yyn = yytable_[yyn];
+    if (yyn <= 0)
+      {
+        if (yy_table_value_is_error_ (yyn))
+          goto yyerrlab;
+        yyn = -yyn;
+        goto yyreduce;
+      }
+
+    // Count tokens shifted since error; after three, turn off error status.
+    if (yyerrstatus_)
+      --yyerrstatus_;
+
+    // Shift the lookahead token.
+    yypush_ ("Shifting", state_type (yyn), YY_MOVE (yyla));
+    goto yynewstate;
+
+
+  /*-----------------------------------------------------------.
+  | yydefault -- do the default action for the current state.  |
+  `-----------------------------------------------------------*/
+  yydefault:
+    yyn = yydefact_[+yystack_[0].state];
+    if (yyn == 0)
+      goto yyerrlab;
+    goto yyreduce;
+
+
+  /*-----------------------------.
+  | yyreduce -- do a reduction.  |
+  `-----------------------------*/
+  yyreduce:
+    yylen = yyr2_[yyn];
+    {
+      stack_symbol_type yylhs;
+      yylhs.state = yy_lr_goto_state_ (yystack_[yylen].state, yyr1_[yyn]);
+      /* Variants are always initialized to an empty instance of the
+         correct type. The default '$$ = $1' action is NOT applied
+         when using variants.  */
+      switch (yyr1_[yyn])
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        yylhs.value.emplace< TokenOption::RepresentationType > ();
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        yylhs.value.emplace< TokenPkt4::FieldType > ();
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        yylhs.value.emplace< TokenPkt6::FieldType > ();
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        yylhs.value.emplace< TokenPkt::MetadataType > ();
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        yylhs.value.emplace< TokenRelay6Field::FieldType > ();
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        yylhs.value.emplace< int8_t > ();
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        yylhs.value.emplace< std::string > ();
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        yylhs.value.emplace< uint16_t > ();
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        yylhs.value.emplace< uint32_t > ();
+        break;
+
+      default:
+        break;
+    }
+
+
+      // Default location.
+      {
+        stack_type::slice range (yystack_, yylen);
+        YYLLOC_DEFAULT (yylhs.location, range, yylen);
+        yyerror_range[1].location = yylhs.location;
+      }
+
+      // Perform the reduction.
+      YY_REDUCE_PRINT (yyn);
+#if YY_EXCEPTIONS
+      try
+#endif // YY_EXCEPTIONS
+        {
+          switch (yyn)
+            {
+  case 6: // bool_expr: "not" bool_expr
+#line 147 "parser.yy"
+                {
+                    TokenPtr neg(new TokenNot());
+                    ctx.expression.push_back(neg);
+                }
+#line 851 "parser.cc"
+    break;
+
+  case 7: // bool_expr: bool_expr "and" bool_expr
+#line 152 "parser.yy"
+                {
+                    TokenPtr neg(new TokenAnd());
+                    ctx.expression.push_back(neg);
+                }
+#line 860 "parser.cc"
+    break;
+
+  case 8: // bool_expr: bool_expr "or" bool_expr
+#line 157 "parser.yy"
+                {
+                    TokenPtr neg(new TokenOr());
+                    ctx.expression.push_back(neg);
+                }
+#line 869 "parser.cc"
+    break;
+
+  case 9: // bool_expr: string_expr "==" string_expr
+#line 162 "parser.yy"
+                {
+                    TokenPtr eq(new TokenEqual());
+                    ctx.expression.push_back(eq);
+                }
+#line 878 "parser.cc"
+    break;
+
+  case 10: // bool_expr: "option" "[" option_code "]" "." "exists"
+#line 167 "parser.yy"
+                {
+                    TokenPtr opt(new TokenOption(yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
+                    ctx.expression.push_back(opt);
+                }
+#line 887 "parser.cc"
+    break;
+
+  case 11: // bool_expr: "option" "[" option_code "]" "." "option" "[" sub_option_code "]" "." "exists"
+#line 172 "parser.yy"
+                {
+                    TokenPtr opt(new TokenSubOption(yystack_[8].value.as < uint16_t > (), yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
+                    ctx.expression.push_back(opt);
+                }
+#line 896 "parser.cc"
+    break;
+
+  case 12: // bool_expr: "relay4" "[" sub_option_code "]" "." "exists"
+#line 177 "parser.yy"
+                {
+                   switch (ctx.getUniverse()) {
+                   case Option::V4:
+                   {
+                       TokenPtr opt(new TokenRelay4Option(yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
+                       ctx.expression.push_back(opt);
+                       break;
+                   }
+                   case Option::V6:
+                       // We will have relay6[123] for the DHCPv6.
+                       // In a very distant future we'll possibly be able
+                       // to mix both if we have DHCPv4-over-DHCPv6, so it
+                       // has some sense to make it explicit whether we
+                       // talk about DHCPv4 relay or DHCPv6 relay. However,
+                       // for the time being relay4 can be used in DHCPv4
+                       // only.
+                       error(yystack_[5].location, "relay4 can only be used in DHCPv4.");
+                   }
+                }
+#line 920 "parser.cc"
+    break;
+
+  case 13: // bool_expr: "relay6" "[" nest_level "]" "." "option" "[" sub_option_code "]" "." "exists"
+#line 197 "parser.yy"
+                {
+                    switch (ctx.getUniverse()) {
+                    case Option::V6:
+                    {
+                        TokenPtr opt(new TokenRelay6Option(yystack_[8].value.as < int8_t > (), yystack_[3].value.as < uint16_t > (), TokenOption::EXISTS));
+                        ctx.expression.push_back(opt);
+                        break;
+                    }
+                    case Option::V4:
+                        // For now we only use relay6 in DHCPv6.
+                        error(yystack_[10].location, "relay6 can only be used in DHCPv6.");
+                    }
+                }
+#line 938 "parser.cc"
+    break;
+
+  case 14: // bool_expr: "vendor-class" "[" enterprise_id "]" "." "exists"
+#line 211 "parser.yy"
+              {
+                  // Expression: vendor-class[1234].exists
+                  //
+                  // This token will find option 124 (DHCPv4) or 16 (DHCPv6),
+                  // and will check if enterprise-id equals specified value.
+                  TokenPtr exist(new TokenVendorClass(ctx.getUniverse(), yystack_[3].value.as < uint32_t > (), TokenOption::EXISTS));
+                  ctx.expression.push_back(exist);
+              }
+#line 951 "parser.cc"
+    break;
+
+  case 15: // bool_expr: "vendor" "[" enterprise_id "]" "." "exists"
+#line 220 "parser.yy"
+              {
+                  // Expression: vendor[1234].exists
+                  //
+                  // This token will find option 125 (DHCPv4) or 17 (DHCPv6),
+                  // and will check if enterprise-id equals specified value.
+                  TokenPtr exist(new TokenVendor(ctx.getUniverse(), yystack_[3].value.as < uint32_t > (), TokenOption::EXISTS));
+                  ctx.expression.push_back(exist);
+              }
+#line 964 "parser.cc"
+    break;
+
+  case 16: // bool_expr: "vendor" "[" enterprise_id "]" "." "option" "[" sub_option_code "]" "." "exists"
+#line 229 "parser.yy"
+              {
+                  // Expression vendor[1234].option[123].exists
+                  //
+                  // This token will check if specified vendor option
+                  // exists, has specified enterprise-id and if has
+                  // specified suboption.
+                  TokenPtr exist(new TokenVendor(ctx.getUniverse(), yystack_[8].value.as < uint32_t > (), TokenOption::EXISTS, yystack_[3].value.as < uint16_t > ()));
+                  ctx.expression.push_back(exist);
+               }
+#line 978 "parser.cc"
+    break;
+
+  case 17: // bool_expr: "member" "(" "constant string" ")"
+#line 239 "parser.yy"
+              {
+                  // Expression member('foo')
+                  //
+                  // This token will check if the packet is a member of
+                  // the specified client class.
+                  // To avoid loops at evaluation only already defined and
+                  // built-in classes are allowed.
+                  std::string cc = yystack_[1].value.as < std::string > ();
+                  if (!ctx.isClientClassDefined(cc)) {
+                      error(yystack_[1].location, "Not defined client class '" + cc + "'");
+                  }
+                  TokenPtr member(new TokenMember(cc));
+                  ctx.expression.push_back(member);
+              }
+#line 997 "parser.cc"
+    break;
+
+  case 18: // string_expr: "constant string"
+#line 256 "parser.yy"
+                  {
+                      TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
+                      ctx.expression.push_back(str);
+                  }
+#line 1006 "parser.cc"
+    break;
+
+  case 19: // string_expr: "constant hexstring"
+#line 261 "parser.yy"
+                  {
+                      TokenPtr hex(new TokenHexString(yystack_[0].value.as < std::string > ()));
+                      ctx.expression.push_back(hex);
+                  }
+#line 1015 "parser.cc"
+    break;
+
+  case 20: // string_expr: "ip address"
+#line 266 "parser.yy"
+                  {
+                      TokenPtr ip(new TokenIpAddress(yystack_[0].value.as < std::string > ()));
+                      ctx.expression.push_back(ip);
+                  }
+#line 1024 "parser.cc"
+    break;
+
+  case 21: // string_expr: "option" "[" option_code "]" "." option_repr_type
+#line 271 "parser.yy"
+                  {
+                      TokenPtr opt(new TokenOption(yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
+                      ctx.expression.push_back(opt);
+                  }
+#line 1033 "parser.cc"
+    break;
+
+  case 22: // string_expr: "option" "[" option_code "]" "." "option" "[" sub_option_code "]" "." option_repr_type
+#line 276 "parser.yy"
+                  {
+                      TokenPtr opt(new TokenSubOption(yystack_[8].value.as < uint16_t > (), yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
+                      ctx.expression.push_back(opt);
+                  }
+#line 1042 "parser.cc"
+    break;
+
+  case 23: // string_expr: "relay4" "[" sub_option_code "]" "." option_repr_type
+#line 281 "parser.yy"
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V4:
+                     {
+                         TokenPtr opt(new TokenRelay4Option(yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
+                         ctx.expression.push_back(opt);
+                         break;
+                     }
+                     case Option::V6:
+                         // We will have relay6[123] for the DHCPv6.
+                         // In a very distant future we'll possibly be able
+                         // to mix both if we have DHCPv4-over-DHCPv6, so it
+                         // has some sense to make it explicit whether we
+                         // talk about DHCPv4 relay or DHCPv6 relay. However,
+                         // for the time being relay4 can be used in DHCPv4
+                         // only.
+                         error(yystack_[5].location, "relay4 can only be used in DHCPv4.");
+                     }
+                  }
+#line 1066 "parser.cc"
+    break;
+
+  case 24: // string_expr: "relay6" "[" nest_level "]" "." "option" "[" sub_option_code "]" "." option_repr_type
+#line 302 "parser.yy"
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V6:
+                     {
+                         TokenPtr opt(new TokenRelay6Option(yystack_[8].value.as < int8_t > (), yystack_[3].value.as < uint16_t > (), yystack_[0].value.as < TokenOption::RepresentationType > ()));
+                         ctx.expression.push_back(opt);
+                         break;
+                     }
+                     case Option::V4:
+                         // For now we only use relay6 in DHCPv6.
+                         error(yystack_[10].location, "relay6 can only be used in DHCPv6.");
+                     }
+                  }
+#line 1084 "parser.cc"
+    break;
+
+  case 25: // string_expr: "pkt" "." pkt_metadata
+#line 317 "parser.yy"
+                  {
+                      TokenPtr pkt_metadata(new TokenPkt(yystack_[0].value.as < TokenPkt::MetadataType > ()));
+                      ctx.expression.push_back(pkt_metadata);
+                  }
+#line 1093 "parser.cc"
+    break;
+
+  case 26: // string_expr: "pkt4" "." pkt4_field
+#line 322 "parser.yy"
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V4:
+                     {
+                         TokenPtr pkt4_field(new TokenPkt4(yystack_[0].value.as < TokenPkt4::FieldType > ()));
+                         ctx.expression.push_back(pkt4_field);
+                         break;
+                     }
+                     case Option::V6:
+                         // For now we only use pkt4 in DHCPv4.
+                         error(yystack_[2].location, "pkt4 can only be used in DHCPv4.");
+                     }
+                  }
+#line 1111 "parser.cc"
+    break;
+
+  case 27: // string_expr: "pkt6" "." pkt6_field
+#line 336 "parser.yy"
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V6:
+                     {
+                         TokenPtr pkt6_field(new TokenPkt6(yystack_[0].value.as < TokenPkt6::FieldType > ()));
+                         ctx.expression.push_back(pkt6_field);
+                         break;
+                     }
+                     case Option::V4:
+                         // For now we only use pkt6 in DHCPv6.
+                         error(yystack_[2].location, "pkt6 can only be used in DHCPv6.");
+                     }
+                  }
+#line 1129 "parser.cc"
+    break;
+
+  case 28: // string_expr: "relay6" "[" nest_level "]" "." relay6_field
+#line 350 "parser.yy"
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V6:
+                     {
+                         TokenPtr relay6field(new TokenRelay6Field(yystack_[3].value.as < int8_t > (), yystack_[0].value.as < TokenRelay6Field::FieldType > ()));
+                         ctx.expression.push_back(relay6field);
+                         break;
+                     }
+                     case Option::V4:
+                         // For now we only use relay6 in DHCPv6.
+                         error(yystack_[5].location, "relay6 can only be used in DHCPv6.");
+                     }
+                  }
+#line 1147 "parser.cc"
+    break;
+
+  case 29: // string_expr: "substring" "(" string_expr "," start_expr "," length_expr ")"
+#line 365 "parser.yy"
+                  {
+                      TokenPtr sub(new TokenSubstring());
+                      ctx.expression.push_back(sub);
+                  }
+#line 1156 "parser.cc"
+    break;
+
+  case 30: // string_expr: "split" "(" string_expr "," string_expr "," int_expr ")"
+#line 370 "parser.yy"
+                  {
+                      TokenPtr split(new TokenSplit());
+                      ctx.expression.push_back(split);
+                  }
+#line 1165 "parser.cc"
+    break;
+
+  case 31: // string_expr: "concat" "(" string_expr "," string_expr ")"
+#line 375 "parser.yy"
+                  {
+                      TokenPtr conc(new TokenConcat());
+                      ctx.expression.push_back(conc);
+                  }
+#line 1174 "parser.cc"
+    break;
+
+  case 32: // string_expr: string_expr "+" string_expr
+#line 380 "parser.yy"
+                  {
+                      TokenPtr conc(new TokenConcat());
+                      ctx.expression.push_back(conc);
+                  }
+#line 1183 "parser.cc"
+    break;
+
+  case 33: // string_expr: "ifelse" "(" bool_expr "," string_expr "," string_expr ")"
+#line 385 "parser.yy"
+                  {
+                      TokenPtr cond(new TokenIfElse());
+                      ctx.expression.push_back(cond);
+                  }
+#line 1192 "parser.cc"
+    break;
+
+  case 34: // string_expr: "hexstring" "(" string_expr "," string_expr ")"
+#line 390 "parser.yy"
+                  {
+                      TokenPtr tohex(new TokenToHexString());
+                      ctx.expression.push_back(tohex);
+                  }
+#line 1201 "parser.cc"
+    break;
+
+  case 35: // string_expr: "addrtotext" "(" string_expr ")"
+#line 395 "parser.yy"
+                  {
+                      TokenPtr addrtotext(new TokenIpAddressToText());
+                      ctx.expression.push_back(addrtotext);
+                  }
+#line 1210 "parser.cc"
+    break;
+
+  case 36: // string_expr: "int8totext" "(" string_expr ")"
+#line 400 "parser.yy"
+                  {
+                      TokenPtr int8totext(new TokenInt8ToText());
+                      ctx.expression.push_back(int8totext);
+                  }
+#line 1219 "parser.cc"
+    break;
+
+  case 37: // string_expr: "int16totext" "(" string_expr ")"
+#line 405 "parser.yy"
+                  {
+                      TokenPtr int16totext(new TokenInt16ToText());
+                      ctx.expression.push_back(int16totext);
+                  }
+#line 1228 "parser.cc"
+    break;
+
+  case 38: // string_expr: "int32totext" "(" string_expr ")"
+#line 410 "parser.yy"
+                  {
+                      TokenPtr int32totext(new TokenInt32ToText());
+                      ctx.expression.push_back(int32totext);
+                  }
+#line 1237 "parser.cc"
+    break;
+
+  case 39: // string_expr: "uint8totext" "(" string_expr ")"
+#line 415 "parser.yy"
+                  {
+                      TokenPtr uint8totext(new TokenUInt8ToText());
+                      ctx.expression.push_back(uint8totext);
+                  }
+#line 1246 "parser.cc"
+    break;
+
+  case 40: // string_expr: "uint16totext" "(" string_expr ")"
+#line 420 "parser.yy"
+                  {
+                      TokenPtr uint16totext(new TokenUInt16ToText());
+                      ctx.expression.push_back(uint16totext);
+                  }
+#line 1255 "parser.cc"
+    break;
+
+  case 41: // string_expr: "uint32totext" "(" string_expr ")"
+#line 425 "parser.yy"
+                  {
+                      TokenPtr uint32totext(new TokenUInt32ToText());
+                      ctx.expression.push_back(uint32totext);
+                  }
+#line 1264 "parser.cc"
+    break;
+
+  case 42: // string_expr: "vendor" "." "enterprise"
+#line 430 "parser.yy"
+                {
+                    // expression: vendor.enterprise
+                    //
+                    // This token will return enterprise-id number of
+                    // received vendor option.
+                    TokenPtr vendor(new TokenVendor(ctx.getUniverse(), 0, TokenVendor::ENTERPRISE_ID));
+                    ctx.expression.push_back(vendor);
+                }
+#line 1277 "parser.cc"
+    break;
+
+  case 43: // string_expr: "vendor-class" "." "enterprise"
+#line 439 "parser.yy"
+                {
+                    // expression: vendor-class.enterprise
+                    //
+                    // This token will return enterprise-id number of
+                    // received vendor class option.
+                    TokenPtr vendor(new TokenVendorClass(ctx.getUniverse(), 0,
+                                                         TokenVendor::ENTERPRISE_ID));
+                    ctx.expression.push_back(vendor);
+                }
+#line 1291 "parser.cc"
+    break;
+
+  case 44: // string_expr: "vendor" "[" enterprise_id "]" "." "option" "[" sub_option_code "]" "." option_repr_type
+#line 449 "parser.yy"
+                {
+                    // This token will search for vendor option with
+                    // specified enterprise-id.  If found, will search
+                    // for specified suboption and finally will return
+                    // its content.
+                    TokenPtr opt(new TokenVendor(ctx.getUniverse(), yystack_[8].value.as < uint32_t > (), yystack_[0].value.as < TokenOption::RepresentationType > (), yystack_[3].value.as < uint16_t > ()));
+                    ctx.expression.push_back(opt);
+                }
+#line 1304 "parser.cc"
+    break;
+
+  case 45: // string_expr: "vendor-class" "[" enterprise_id "]" "." "data"
+#line 458 "parser.yy"
+                {
+                    // expression: vendor-class[1234].data
+                    //
+                    // Vendor class option does not have suboptions,
+                    // but chunks of data (typically 1, but the option
+                    // structure allows multiple of them). If chunk
+                    // offset is not specified, we assume the first (0th)
+                    // is requested.
+                    TokenPtr vendor_class(new TokenVendorClass(ctx.getUniverse(), yystack_[3].value.as < uint32_t > (),
+                                                               TokenVendor::DATA, 0));
+                    ctx.expression.push_back(vendor_class);
+                }
+#line 1321 "parser.cc"
+    break;
+
+  case 46: // string_expr: "vendor-class" "[" enterprise_id "]" "." "data" "[" "integer" "]"
+#line 471 "parser.yy"
+                {
+                    // expression: vendor-class[1234].data[5]
+                    //
+                    // Vendor class option does not have suboptions,
+                    // but chunks of data (typically 1, but the option
+                    // structure allows multiple of them). This syntax
+                    // specifies which data chunk (tuple) we want.
+                    uint8_t index = ctx.convertUint8(yystack_[1].value.as < std::string > (), yystack_[1].location);
+                    TokenPtr vendor_class(new TokenVendorClass(ctx.getUniverse(), yystack_[6].value.as < uint32_t > (),
+                                                               TokenVendor::DATA, index));
+                    ctx.expression.push_back(vendor_class);
+                }
+#line 1338 "parser.cc"
+    break;
+
+  case 47: // string_expr: integer_expr
+#line 484 "parser.yy"
+                {
+                    TokenPtr integer(new TokenInteger(yystack_[0].value.as < uint32_t > ()));
+                    ctx.expression.push_back(integer);
+                }
+#line 1347 "parser.cc"
+    break;
+
+  case 49: // integer_expr: "integer"
+#line 492 "parser.yy"
+                 {
+                     yylhs.value.as < uint32_t > () = ctx.convertUint32(yystack_[0].value.as < std::string > (), yystack_[0].location);
+                 }
+#line 1355 "parser.cc"
+    break;
+
+  case 50: // option_code: "integer"
+#line 498 "parser.yy"
+                 {
+                     yylhs.value.as < uint16_t > () = ctx.convertOptionCode(yystack_[0].value.as < std::string > (), yystack_[0].location);
+                 }
+#line 1363 "parser.cc"
+    break;
+
+  case 51: // option_code: "option name"
+#line 502 "parser.yy"
+                 {
+                     yylhs.value.as < uint16_t > () = ctx.convertOptionName(yystack_[0].value.as < std::string > (), yystack_[0].location);
+                 }
+#line 1371 "parser.cc"
+    break;
+
+  case 52: // sub_option_code: "integer"
+#line 508 "parser.yy"
+                 {
+                     yylhs.value.as < uint16_t > () = ctx.convertOptionCode(yystack_[0].value.as < std::string > (), yystack_[0].location);
+                 }
+#line 1379 "parser.cc"
+    break;
+
+  case 53: // option_repr_type: "text"
+#line 514 "parser.yy"
+                      {
+                          yylhs.value.as < TokenOption::RepresentationType > () = TokenOption::TEXTUAL;
+                      }
+#line 1387 "parser.cc"
+    break;
+
+  case 54: // option_repr_type: "hex"
+#line 518 "parser.yy"
+                      {
+                          yylhs.value.as < TokenOption::RepresentationType > () = TokenOption::HEXADECIMAL;
+                      }
+#line 1395 "parser.cc"
+    break;
+
+  case 55: // nest_level: "integer"
+#line 524 "parser.yy"
+                 {
+                     yylhs.value.as < int8_t > () = ctx.convertNestLevelNumber(yystack_[0].value.as < std::string > (), yystack_[0].location);
+                 }
+#line 1403 "parser.cc"
+    break;
+
+  case 56: // pkt_metadata: "iface"
+#line 533 "parser.yy"
+                  {
+                      yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::IFACE;
+                  }
+#line 1411 "parser.cc"
+    break;
+
+  case 57: // pkt_metadata: "src"
+#line 537 "parser.yy"
+                  {
+                      yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::SRC;
+                  }
+#line 1419 "parser.cc"
+    break;
+
+  case 58: // pkt_metadata: "dst"
+#line 541 "parser.yy"
+                  {
+                      yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::DST;
+                  }
+#line 1427 "parser.cc"
+    break;
+
+  case 59: // pkt_metadata: "len"
+#line 545 "parser.yy"
+                  {
+                      yylhs.value.as < TokenPkt::MetadataType > () = TokenPkt::LEN;
+                  }
+#line 1435 "parser.cc"
+    break;
+
+  case 60: // enterprise_id: "integer"
+#line 551 "parser.yy"
+                   {
+                       yylhs.value.as < uint32_t > () = ctx.convertUint32(yystack_[0].value.as < std::string > (), yystack_[0].location);
+                   }
+#line 1443 "parser.cc"
+    break;
+
+  case 61: // enterprise_id: "*"
+#line 555 "parser.yy"
+                   {
+                       yylhs.value.as < uint32_t > () = 0;
+                   }
+#line 1451 "parser.cc"
+    break;
+
+  case 62: // pkt4_field: "mac"
+#line 561 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::CHADDR;
+                }
+#line 1459 "parser.cc"
+    break;
+
+  case 63: // pkt4_field: "hlen"
+#line 565 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::HLEN;
+                }
+#line 1467 "parser.cc"
+    break;
+
+  case 64: // pkt4_field: "htype"
+#line 569 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::HTYPE;
+                }
+#line 1475 "parser.cc"
+    break;
+
+  case 65: // pkt4_field: "ciaddr"
+#line 573 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::CIADDR;
+                }
+#line 1483 "parser.cc"
+    break;
+
+  case 66: // pkt4_field: "giaddr"
+#line 577 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::GIADDR;
+                }
+#line 1491 "parser.cc"
+    break;
+
+  case 67: // pkt4_field: "yiaddr"
+#line 581 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::YIADDR;
+                }
+#line 1499 "parser.cc"
+    break;
+
+  case 68: // pkt4_field: "siaddr"
+#line 585 "parser.yy"
+                {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::SIADDR;
+                }
+#line 1507 "parser.cc"
+    break;
+
+  case 69: // pkt4_field: "msgtype"
+#line 589 "parser.yy"
+                 {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::MSGTYPE;
+                 }
+#line 1515 "parser.cc"
+    break;
+
+  case 70: // pkt4_field: "transid"
+#line 593 "parser.yy"
+                 {
+                    yylhs.value.as < TokenPkt4::FieldType > () = TokenPkt4::TRANSID;
+                 }
+#line 1523 "parser.cc"
+    break;
+
+  case 71: // pkt6_field: "msgtype"
+#line 599 "parser.yy"
+                 {
+                     yylhs.value.as < TokenPkt6::FieldType > () = TokenPkt6::MSGTYPE;
+                 }
+#line 1531 "parser.cc"
+    break;
+
+  case 72: // pkt6_field: "transid"
+#line 603 "parser.yy"
+                 {
+                     yylhs.value.as < TokenPkt6::FieldType > () = TokenPkt6::TRANSID;
+                 }
+#line 1539 "parser.cc"
+    break;
+
+  case 73: // relay6_field: "peeraddr"
+#line 609 "parser.yy"
+                   {
+                       yylhs.value.as < TokenRelay6Field::FieldType > () = TokenRelay6Field::PEERADDR;
+                   }
+#line 1547 "parser.cc"
+    break;
+
+  case 74: // relay6_field: "linkaddr"
+#line 613 "parser.yy"
+                   {
+                       yylhs.value.as < TokenRelay6Field::FieldType > () = TokenRelay6Field::LINKADDR;
+                   }
+#line 1555 "parser.cc"
+    break;
+
+  case 75: // start_expr: "integer"
+#line 619 "parser.yy"
+                {
+                    TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
+                    ctx.expression.push_back(str);
+                }
+#line 1564 "parser.cc"
+    break;
+
+  case 76: // length_expr: "integer"
+#line 626 "parser.yy"
+                 {
+                     TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
+                     ctx.expression.push_back(str);
+                 }
+#line 1573 "parser.cc"
+    break;
+
+  case 77: // length_expr: "all"
+#line 631 "parser.yy"
+                 {
+                     TokenPtr str(new TokenString("all"));
+                     ctx.expression.push_back(str);
+                 }
+#line 1582 "parser.cc"
+    break;
+
+  case 78: // int_expr: "integer"
+#line 637 "parser.yy"
+                 {
+                     TokenPtr str(new TokenString(yystack_[0].value.as < std::string > ()));
+                     ctx.expression.push_back(str);
+                 }
+#line 1591 "parser.cc"
+    break;
+
+
+#line 1595 "parser.cc"
+
+            default:
+              break;
+            }
+        }
+#if YY_EXCEPTIONS
+      catch (const syntax_error& yyexc)
+        {
+          YYCDEBUG << "Caught exception: " << yyexc.what() << '\n';
+          error (yyexc);
+          YYERROR;
+        }
+#endif // YY_EXCEPTIONS
+      YY_SYMBOL_PRINT ("-> $$ =", yylhs);
+      yypop_ (yylen);
+      yylen = 0;
+
+      // Shift the result of the reduction.
+      yypush_ (YY_NULLPTR, YY_MOVE (yylhs));
+    }
+    goto yynewstate;
+
+
+  /*--------------------------------------.
+  | yyerrlab -- here on detecting error.  |
+  `--------------------------------------*/
+  yyerrlab:
+    // If not already recovering from an error, report this error.
+    if (!yyerrstatus_)
+      {
+        ++yynerrs_;
+        context yyctx (*this, yyla);
+        std::string msg = yysyntax_error_ (yyctx);
+        error (yyla.location, YY_MOVE (msg));
+      }
+
+
+    yyerror_range[1].location = yyla.location;
+    if (yyerrstatus_ == 3)
+      {
+        /* If just tried and failed to reuse lookahead token after an
+           error, discard it.  */
+
+        // Return failure if at end of input.
+        if (yyla.kind () == symbol_kind::S_YYEOF)
+          YYABORT;
+        else if (!yyla.empty ())
+          {
+            yy_destroy_ ("Error: discarding", yyla);
+            yyla.clear ();
+          }
+      }
+
+    // Else will try to reuse lookahead token after shifting the error token.
+    goto yyerrlab1;
+
+
+  /*---------------------------------------------------.
+  | yyerrorlab -- error raised explicitly by YYERROR.  |
+  `---------------------------------------------------*/
+  yyerrorlab:
+    /* Pacify compilers when the user code never invokes YYERROR and
+       the label yyerrorlab therefore never appears in user code.  */
+    if (false)
+      YYERROR;
+
+    /* Do not reclaim the symbols of the rule whose action triggered
+       this YYERROR.  */
+    yypop_ (yylen);
+    yylen = 0;
+    YY_STACK_PRINT ();
+    goto yyerrlab1;
+
+
+  /*-------------------------------------------------------------.
+  | yyerrlab1 -- common code for both syntax error and YYERROR.  |
+  `-------------------------------------------------------------*/
+  yyerrlab1:
+    yyerrstatus_ = 3;   // Each real token shifted decrements this.
+    // Pop stack until we find a state that shifts the error token.
+    for (;;)
+      {
+        yyn = yypact_[+yystack_[0].state];
+        if (!yy_pact_value_is_default_ (yyn))
+          {
+            yyn += symbol_kind::S_YYerror;
+            if (0 <= yyn && yyn <= yylast_
+                && yycheck_[yyn] == symbol_kind::S_YYerror)
+              {
+                yyn = yytable_[yyn];
+                if (0 < yyn)
+                  break;
+              }
+          }
+
+        // Pop the current state because it cannot handle the error token.
+        if (yystack_.size () == 1)
+          YYABORT;
+
+        yyerror_range[1].location = yystack_[0].location;
+        yy_destroy_ ("Error: popping", yystack_[0]);
+        yypop_ ();
+        YY_STACK_PRINT ();
+      }
+    {
+      stack_symbol_type error_token;
+
+      yyerror_range[2].location = yyla.location;
+      YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);
+
+      // Shift the error token.
+      error_token.state = state_type (yyn);
+      yypush_ ("Shifting", YY_MOVE (error_token));
+    }
+    goto yynewstate;
+
+
+  /*-------------------------------------.
+  | yyacceptlab -- YYACCEPT comes here.  |
+  `-------------------------------------*/
+  yyacceptlab:
+    yyresult = 0;
+    goto yyreturn;
+
+
+  /*-----------------------------------.
+  | yyabortlab -- YYABORT comes here.  |
+  `-----------------------------------*/
+  yyabortlab:
+    yyresult = 1;
+    goto yyreturn;
+
+
+  /*-----------------------------------------------------.
+  | yyreturn -- parsing is finished, return the result.  |
+  `-----------------------------------------------------*/
+  yyreturn:
+    if (!yyla.empty ())
+      yy_destroy_ ("Cleanup: discarding lookahead", yyla);
+
+    /* Do not reclaim the symbols of the rule whose action triggered
+       this YYABORT or YYACCEPT.  */
+    yypop_ (yylen);
+    YY_STACK_PRINT ();
+    while (1 < yystack_.size ())
+      {
+        yy_destroy_ ("Cleanup: popping", yystack_[0]);
+        yypop_ ();
+      }
+
+    return yyresult;
+  }
+#if YY_EXCEPTIONS
+    catch (...)
+      {
+        YYCDEBUG << "Exception caught: cleaning lookahead and stack\n";
+        // Do not try to display the values of the reclaimed symbols,
+        // as their printers might throw an exception.
+        if (!yyla.empty ())
+          yy_destroy_ (YY_NULLPTR, yyla);
+
+        while (1 < yystack_.size ())
+          {
+            yy_destroy_ (YY_NULLPTR, yystack_[0]);
+            yypop_ ();
+          }
+        throw;
+      }
+#endif // YY_EXCEPTIONS
+  }
+
+  void
+  EvalParser::error (const syntax_error& yyexc)
+  {
+    error (yyexc.location, yyexc.what ());
+  }
+
+  /* Return YYSTR after stripping away unnecessary quotes and
+     backslashes, so that it's suitable for yyerror.  The heuristic is
+     that double-quoting is unnecessary unless the string contains an
+     apostrophe, a comma, or backslash (other than backslash-backslash).
+     YYSTR is taken from yytname.  */
+  std::string
+  EvalParser::yytnamerr_ (const char *yystr)
+  {
+    if (*yystr == '"')
+      {
+        std::string yyr;
+        char const *yyp = yystr;
+
+        for (;;)
+          switch (*++yyp)
+            {
+            case '\'':
+            case ',':
+              goto do_not_strip_quotes;
+
+            case '\\':
+              if (*++yyp != '\\')
+                goto do_not_strip_quotes;
+              else
+                goto append;
+
+            append:
+            default:
+              yyr += *yyp;
+              break;
+
+            case '"':
+              return yyr;
+            }
+      do_not_strip_quotes: ;
+      }
+
+    return yystr;
+  }
+
+  std::string
+  EvalParser::symbol_name (symbol_kind_type yysymbol)
+  {
+    return yytnamerr_ (yytname_[yysymbol]);
+  }
+
+
+
+  // EvalParser::context.
+  EvalParser::context::context (const EvalParser& yyparser, const symbol_type& yyla)
+    : yyparser_ (yyparser)
+    , yyla_ (yyla)
+  {}
+
+  int
+  EvalParser::context::expected_tokens (symbol_kind_type yyarg[], int yyargn) const
+  {
+    // Actual number of expected tokens
+    int yycount = 0;
+
+    const int yyn = yypact_[+yyparser_.yystack_[0].state];
+    if (!yy_pact_value_is_default_ (yyn))
+      {
+        /* Start YYX at -YYN if negative to avoid negative indexes in
+           YYCHECK.  In other words, skip the first -YYN actions for
+           this state because they are default actions.  */
+        const int yyxbegin = yyn < 0 ? -yyn : 0;
+        // Stay within bounds of both yycheck and yytname.
+        const int yychecklim = yylast_ - yyn + 1;
+        const int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
+        for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
+          if (yycheck_[yyx + yyn] == yyx && yyx != symbol_kind::S_YYerror
+              && !yy_table_value_is_error_ (yytable_[yyx + yyn]))
+            {
+              if (!yyarg)
+                ++yycount;
+              else if (yycount == yyargn)
+                return 0;
+              else
+                yyarg[yycount++] = YY_CAST (symbol_kind_type, yyx);
+            }
+      }
+
+    if (yyarg && yycount == 0 && 0 < yyargn)
+      yyarg[0] = symbol_kind::S_YYEMPTY;
+    return yycount;
+  }
+
+
+
+
+
+
+  int
+  EvalParser::yy_syntax_error_arguments_ (const context& yyctx,
+                                                 symbol_kind_type yyarg[], int yyargn) const
+  {
+    /* There are many possibilities here to consider:
+       - If this state is a consistent state with a default action, then
+         the only way this function was invoked is if the default action
+         is an error action.  In that case, don't check for expected
+         tokens because there are none.
+       - The only way there can be no lookahead present (in yyla) is
+         if this state is a consistent state with a default action.
+         Thus, detecting the absence of a lookahead is sufficient to
+         determine that there is no unexpected or expected token to
+         report.  In that case, just report a simple "syntax error".
+       - Don't assume there isn't a lookahead just because this state is
+         a consistent state with a default action.  There might have
+         been a previous inconsistent state, consistent state with a
+         non-default action, or user semantic action that manipulated
+         yyla.  (However, yyla is currently not documented for users.)
+       - Of course, the expected token list depends on states to have
+         correct lookahead information, and it depends on the parser not
+         to perform extra reductions after fetching a lookahead from the
+         scanner and before detecting a syntax error.  Thus, state merging
+         (from LALR or IELR) and default reductions corrupt the expected
+         token list.  However, the list is correct for canonical LR with
+         one exception: it will still contain any token that will not be
+         accepted due to an error action in a later state.
+    */
+
+    if (!yyctx.lookahead ().empty ())
+      {
+        if (yyarg)
+          yyarg[0] = yyctx.token ();
+        int yyn = yyctx.expected_tokens (yyarg ? yyarg + 1 : yyarg, yyargn - 1);
+        return yyn + 1;
+      }
+    return 0;
+  }
+
+  // Generate an error message.
+  std::string
+  EvalParser::yysyntax_error_ (const context& yyctx) const
+  {
+    // Its maximum.
+    enum { YYARGS_MAX = 5 };
+    // Arguments of yyformat.
+    symbol_kind_type yyarg[YYARGS_MAX];
+    int yycount = yy_syntax_error_arguments_ (yyctx, yyarg, YYARGS_MAX);
+
+    char const* yyformat = YY_NULLPTR;
+    switch (yycount)
+      {
+#define YYCASE_(N, S)                         \
+        case N:                               \
+          yyformat = S;                       \
+        break
+      default: // Avoid compiler warnings.
+        YYCASE_ (0, YY_("syntax error"));
+        YYCASE_ (1, YY_("syntax error, unexpected %s"));
+        YYCASE_ (2, YY_("syntax error, unexpected %s, expecting %s"));
+        YYCASE_ (3, YY_("syntax error, unexpected %s, expecting %s or %s"));
+        YYCASE_ (4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
+        YYCASE_ (5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
+#undef YYCASE_
+      }
+
+    std::string yyres;
+    // Argument number.
+    std::ptrdiff_t yyi = 0;
+    for (char const* yyp = yyformat; *yyp; ++yyp)
+      if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
+        {
+          yyres += symbol_name (yyarg[yyi++]);
+          ++yyp;
+        }
+      else
+        yyres += *yyp;
+    return yyres;
+  }
+
+
+  const short EvalParser::yypact_ninf_ = -156;
+
+  const signed char EvalParser::yytable_ninf_ = -1;
+
+  const short
+  EvalParser::yypact_[] =
+  {
+      43,   109,   156,    20,   109,   109,    73,    94,    98,    90,
+      79,   111,   133,   142,   157,   168,   177,   180,   185,   189,
+     190,   192,   211,   219,   207,   112,   131,  -156,  -156,  -156,
+    -156,  -156,   135,    29,  -156,   156,   210,   212,   213,   161,
+     164,   187,  -156,   104,     0,  -156,   -34,   169,   170,   172,
+      82,    52,   156,   156,   156,   109,   156,   156,   156,   156,
+     156,   156,   156,   156,   113,   -39,   176,   -39,   178,   109,
+     109,   156,   156,     1,   -34,   169,   170,   -39,   -39,  -156,
+    -156,  -156,  -156,   217,  -156,   220,  -156,   221,   231,  -156,
+    -156,  -156,  -156,  -156,  -156,  -156,  -156,  -156,  -156,  -156,
+    -156,  -156,  -156,  -156,   147,   150,   173,    10,   174,     2,
+       3,     5,     6,     7,    14,    23,  -156,  -156,  -156,  -156,
+    -156,   222,  -156,   223,  -156,  -156,   234,   187,  -156,   225,
+     226,   227,   228,   229,   230,   232,   233,  -156,   186,   156,
+     156,   156,   156,  -156,  -156,  -156,  -156,  -156,  -156,  -156,
+     235,   236,   237,   238,   239,   240,   241,    16,     4,    78,
+    -156,   214,   181,    25,   184,    26,    11,    77,    80,   188,
+      81,   193,   250,   245,  -156,  -156,  -156,  -156,  -156,  -156,
+     246,  -156,  -156,  -156,   -17,   202,  -156,   156,  -156,  -156,
+     248,   249,  -156,   251,   252,   253,   169,   169,  -156,  -156,
+     261,  -156,   265,    28,   215,   169,   169,   169,   169,   254,
+     255,  -156,  -156,  -156,   256,   257,   258,   260,   262,   263,
+     264,  -156,   266,   267,   268,   269,    97,   106,   155,   188,
+     188,   188,  -156,  -156,  -156,  -156,  -156,  -156
+  };
+
+  const signed char
+  EvalParser::yydefact_[] =
+  {
+       0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,     0,    18,    49,    19,
+      20,     2,     4,     0,    47,     0,     0,     0,     0,     0,
+       0,     3,     1,     0,     0,     6,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,     0,     0,     0,     5,
+      48,    50,    51,     0,    52,     0,    55,     0,     0,    56,
+      57,    58,    59,    25,    62,    63,    64,    65,    66,    67,
+      68,    69,    70,    26,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,    71,    72,    27,    61,
+      60,     0,    43,     0,    42,     7,     8,     9,    32,     0,
+       0,     0,     0,     0,     0,     0,     0,    17,     0,     0,
+       0,     0,     0,    35,    36,    37,    38,    39,    40,    41,
+       0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
+      75,     0,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,    53,    54,    10,    21,    12,    23,
+       0,    73,    74,    28,     0,     0,    31,     0,    34,    14,
+      45,     0,    15,     0,     0,     0,     0,     0,    77,    76,
+       0,    78,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,    29,    30,    33,     0,     0,     0,     0,     0,     0,
+       0,    46,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,    11,    22,    13,    24,    16,    44
+  };
+
+  const short
+  EvalParser::yypgoto_[] =
+  {
+    -156,  -156,  -156,     8,    -2,  -156,   203,   -74,  -155,   206,
+    -156,   -29,  -156,  -156,  -156,  -156,  -156,  -156
+  };
+
+  const unsigned char
+  EvalParser::yydefgoto_[] =
+  {
+       0,     3,    31,    32,    33,    34,    83,    85,   177,    87,
+      93,   121,   103,   118,   183,   161,   200,   202
+  };
+
+  const unsigned char
+  EvalParser::yytable_[] =
+  {
+      41,   130,    44,   179,    80,    80,   143,   144,    71,   145,
+     146,   147,    43,    45,   179,   119,    69,    70,   148,   198,
+      42,   120,   174,   175,   178,   173,    81,   149,    82,   186,
+     188,   189,   213,    73,   174,   175,   176,    71,   123,    72,
+      72,    72,    72,   199,    72,    72,    72,   141,   132,   133,
+     104,   105,   106,    72,   108,   109,   110,   111,   112,   113,
+     114,   115,    72,   107,    72,    72,   190,    72,    72,   127,
+     128,   233,   235,   237,   233,   235,   237,   125,   126,    94,
+      95,    96,    97,    98,    99,   100,   191,   180,    46,   193,
+     194,   181,   182,    49,   181,   182,    50,   192,   174,   175,
+       1,     2,   101,   102,    89,    90,    91,    92,    79,    47,
+      69,    70,     4,    48,     5,   174,   175,   232,     6,     7,
+       8,     9,   209,   210,   174,   175,   234,    65,    51,    66,
+      10,   215,   216,   217,   218,    11,    52,   162,   163,   164,
+     165,    69,    70,    12,    13,    53,    67,    14,    68,    15,
+      16,    17,    18,    19,    20,    21,    22,    23,    24,    35,
+      54,    25,    26,   116,   117,    36,    37,    38,    27,    28,
+      29,    55,    30,   174,   175,   236,    77,    10,    66,    78,
+      56,    68,    11,    57,   138,   203,    72,   139,    58,    72,
+      12,    13,    59,    60,    14,    61,    15,    16,    17,    18,
+      19,    20,    21,    22,    23,    24,   174,   175,    39,    40,
+     140,   142,    72,    72,    62,    27,    28,    29,   185,    30,
+      72,   187,    63,    72,    64,    74,    72,    75,    76,    84,
+      86,    88,   122,   134,   124,   137,   135,   136,   150,   151,
+      69,   152,   153,   154,   155,   156,   160,   157,   190,   158,
+     159,   184,   166,   167,   168,   169,   170,   171,   172,   195,
+     196,   197,   201,   204,   205,   211,   206,   207,   208,   212,
+     219,   220,   221,   222,   223,   214,   224,   129,   225,     0,
+     226,   227,   131,   228,   229,   230,   231
+  };
+
+  const short
+  EvalParser::yycheck_[] =
+  {
+       2,    75,     4,   158,     4,     4,     4,     4,     8,     4,
+       4,     4,     4,     5,   169,    54,     6,     7,     4,    36,
+       0,    60,    18,    19,    20,     9,    60,     4,    62,     4,
+       4,    20,     4,    35,    18,    19,    20,     8,    67,    39,
+      39,    39,    39,    60,    39,    39,    39,    37,    77,    78,
+      52,    53,    54,    39,    56,    57,    58,    59,    60,    61,
+      62,    63,    39,    55,    39,    39,    55,    39,    39,    71,
+      72,   226,   227,   228,   229,   230,   231,    69,    70,    27,
+      28,    29,    30,    31,    32,    33,     9,     9,    15,     9,
+       9,    13,    14,     3,    13,    14,    17,    20,    18,    19,
+      57,    58,    50,    51,    22,    23,    24,    25,     4,    15,
+       6,     7,     3,    15,     5,    18,    19,    20,     9,    10,
+      11,    12,   196,   197,    18,    19,    20,    15,    17,    17,
+      21,   205,   206,   207,   208,    26,     3,   139,   140,   141,
+     142,     6,     7,    34,    35,     3,    15,    38,    17,    40,
+      41,    42,    43,    44,    45,    46,    47,    48,    49,     3,
+       3,    52,    53,    50,    51,     9,    10,    11,    59,    60,
+      61,     3,    63,    18,    19,    20,    15,    21,    17,    15,
+       3,    17,    26,     3,    37,   187,    39,    37,     3,    39,
+      34,    35,     3,     3,    38,     3,    40,    41,    42,    43,
+      44,    45,    46,    47,    48,    49,    18,    19,    52,    53,
+      37,    37,    39,    39,     3,    59,    60,    61,    37,    63,
+      39,    37,     3,    39,    17,    15,    39,    15,    15,    60,
+      60,    59,    56,    16,    56,     4,    16,    16,    16,    16,
+       6,    16,    16,    16,    16,    16,    60,    17,    55,    17,
+      17,    37,    17,    17,    17,    17,    17,    17,    17,     9,
+      15,    15,    60,    15,    15,     4,    15,    15,    15,     4,
+      16,    16,    16,    16,    16,    60,    16,    74,    16,    -1,
+      17,    17,    76,    17,    17,    17,    17
+  };
+
+  const signed char
+  EvalParser::yystos_[] =
+  {
+       0,    57,    58,    65,     3,     5,     9,    10,    11,    12,
+      21,    26,    34,    35,    38,    40,    41,    42,    43,    44,
+      45,    46,    47,    48,    49,    52,    53,    59,    60,    61,
+      63,    66,    67,    68,    69,     3,     9,    10,    11,    52,
+      53,    68,     0,    67,    68,    67,    15,    15,    15,     3,
+      17,    17,     3,     3,     3,     3,     3,     3,     3,     3,
+       3,     3,     3,     3,    17,    15,    17,    15,    17,     6,
+       7,     8,    39,    68,    15,    15,    15,    15,    15,     4,
+       4,    60,    62,    70,    60,    71,    60,    73,    59,    22,
+      23,    24,    25,    74,    27,    28,    29,    30,    31,    32,
+      33,    50,    51,    76,    68,    68,    68,    67,    68,    68,
+      68,    68,    68,    68,    68,    68,    50,    51,    77,    54,
+      60,    75,    56,    75,    56,    67,    67,    68,    68,    70,
+      71,    73,    75,    75,    16,    16,    16,     4,    37,    37,
+      37,    37,    37,     4,     4,     4,     4,     4,     4,     4,
+      16,    16,    16,    16,    16,    16,    16,    17,    17,    17,
+      60,    79,    68,    68,    68,    68,    17,    17,    17,    17,
+      17,    17,    17,     9,    18,    19,    20,    72,    20,    72,
+       9,    13,    14,    78,    37,    37,     4,    37,     4,    20,
+      55,     9,    20,     9,     9,     9,    15,    15,    36,    60,
+      80,    60,    81,    68,    15,    15,    15,    15,    15,    71,
+      71,     4,     4,     4,    60,    71,    71,    71,    71,    16,
+      16,    16,    16,    16,    16,    16,    17,    17,    17,    17,
+      17,    17,    20,    72,    20,    72,    20,    72
+  };
+
+  const signed char
+  EvalParser::yyr1_[] =
+  {
+       0,    64,    65,    65,    66,    67,    67,    67,    67,    67,
+      67,    67,    67,    67,    67,    67,    67,    67,    68,    68,
+      68,    68,    68,    68,    68,    68,    68,    68,    68,    68,
+      68,    68,    68,    68,    68,    68,    68,    68,    68,    68,
+      68,    68,    68,    68,    68,    68,    68,    68,    68,    69,
+      70,    70,    71,    72,    72,    73,    74,    74,    74,    74,
+      75,    75,    76,    76,    76,    76,    76,    76,    76,    76,
+      76,    77,    77,    78,    78,    79,    80,    80,    81
+  };
+
+  const signed char
+  EvalParser::yyr2_[] =
+  {
+       0,     2,     2,     2,     1,     3,     2,     3,     3,     3,
+       6,    11,     6,    11,     6,     6,    11,     4,     1,     1,
+       1,     6,    11,     6,    11,     3,     3,     3,     6,     8,
+       8,     6,     3,     8,     6,     4,     4,     4,     4,     4,
+       4,     4,     3,     3,    11,     6,     9,     1,     3,     1,
+       1,     1,     1,     1,     1,     1,     1,     1,     1,     1,
+       1,     1,     1,     1,     1,     1,     1,     1,     1,     1,
+       1,     1,     1,     1,     1,     1,     1,     1,     1
+  };
+
+
+#if EVALDEBUG || 1
+  // YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+  // First, the terminals, then, starting at \a YYNTOKENS, nonterminals.
+  const char*
+  const EvalParser::yytname_[] =
+  {
+  "\"end of file\"", "error", "\"invalid token\"", "\"(\"", "\")\"",
+  "\"not\"", "\"and\"", "\"or\"", "\"==\"", "\"option\"", "\"relay4\"",
+  "\"relay6\"", "\"member\"", "\"peeraddr\"", "\"linkaddr\"", "\"[\"",
+  "\"]\"", "\".\"", "\"text\"", "\"hex\"", "\"exists\"", "\"pkt\"",
+  "\"iface\"", "\"src\"", "\"dst\"", "\"len\"", "\"pkt4\"", "\"mac\"",
+  "\"hlen\"", "\"htype\"", "\"ciaddr\"", "\"giaddr\"", "\"yiaddr\"",
+  "\"siaddr\"", "\"substring\"", "\"split\"", "\"all\"", "\",\"",
+  "\"concat\"", "\"+\"", "\"ifelse\"", "\"hexstring\"", "\"addrtotext\"",
+  "\"int8totext\"", "\"int16totext\"", "\"int32totext\"",
+  "\"uint8totext\"", "\"uint16totext\"", "\"uint32totext\"", "\"pkt6\"",
+  "\"msgtype\"", "\"transid\"", "\"vendor-class\"", "\"vendor\"", "\"*\"",
+  "\"data\"", "\"enterprise\"", "\"top-level bool\"",
+  "\"top-level string\"", "\"constant string\"", "\"integer\"",
+  "\"constant hexstring\"", "\"option name\"", "\"ip address\"", "$accept",
+  "start", "expression", "bool_expr", "string_expr", "integer_expr",
+  "option_code", "sub_option_code", "option_repr_type", "nest_level",
+  "pkt_metadata", "enterprise_id", "pkt4_field", "pkt6_field",
+  "relay6_field", "start_expr", "length_expr", "int_expr", YY_NULLPTR
+  };
+#endif
+
+
+#if EVALDEBUG
+  const short
+  EvalParser::yyrline_[] =
+  {
+       0,   136,   136,   137,   142,   145,   146,   151,   156,   161,
+     166,   171,   176,   196,   210,   219,   228,   238,   255,   260,
+     265,   270,   275,   280,   301,   316,   321,   335,   349,   364,
+     369,   374,   379,   384,   389,   394,   399,   404,   409,   414,
+     419,   424,   429,   438,   448,   457,   470,   483,   488,   491,
+     497,   501,   507,   513,   517,   523,   532,   536,   540,   544,
+     550,   554,   560,   564,   568,   572,   576,   580,   584,   588,
+     592,   598,   602,   608,   612,   618,   625,   630,   636
+  };
+
+  void
+  EvalParser::yy_stack_print_ () const
+  {
+    *yycdebug_ << "Stack now";
+    for (stack_type::const_iterator
+           i = yystack_.begin (),
+           i_end = yystack_.end ();
+         i != i_end; ++i)
+      *yycdebug_ << ' ' << int (i->state);
+    *yycdebug_ << '\n';
+  }
+
+  void
+  EvalParser::yy_reduce_print_ (int yyrule) const
+  {
+    int yylno = yyrline_[yyrule];
+    int yynrhs = yyr2_[yyrule];
+    // Print the symbols being reduced, and their result.
+    *yycdebug_ << "Reducing stack by rule " << yyrule - 1
+               << " (line " << yylno << "):\n";
+    // The symbols being reduced.
+    for (int yyi = 0; yyi < yynrhs; yyi++)
+      YY_SYMBOL_PRINT ("   $" << yyi + 1 << " =",
+                       yystack_[(yynrhs) - (yyi + 1)]);
+  }
+#endif // EVALDEBUG
+
+
+#line 14 "parser.yy"
+} } // isc::eval
+#line 2219 "parser.cc"
+
+#line 643 "parser.yy"
+
+void
+isc::eval::EvalParser::error(const location_type& loc,
+                             const std::string& what)
+{
+    ctx.error(loc, what);
+}
diff --git a/src/lib/eval/parser.h b/src/lib/eval/parser.h
new file mode 100644
index 0000000..597cf62
--- /dev/null
+++ b/src/lib/eval/parser.h
@@ -0,0 +1,2677 @@
+// A Bison parser, made by GNU Bison 3.8.2.
+
+// Skeleton interface for Bison LALR(1) parsers in C++
+
+// Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// As a special exception, you may create a larger work that contains
+// part or all of the Bison parser skeleton and distribute that work
+// under terms of your choice, so long as that work isn't itself a
+// parser generator using the skeleton or a modified version thereof
+// as a parser skeleton.  Alternatively, if you modify or redistribute
+// the parser skeleton itself, you may (at your option) remove this
+// special exception, which will cause the skeleton and the resulting
+// Bison output files to be licensed under the GNU General Public
+// License without this special exception.
+
+// This special exception was added by the Free Software Foundation in
+// version 2.2 of Bison.
+
+
+/**
+ ** \file parser.h
+ ** Define the isc::eval::parser class.
+ */
+
+// C++ LALR(1) parser skeleton written by Akim Demaille.
+
+// DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
+// especially those whose name start with YY_ or yy_.  They are
+// private implementation details that can be changed or removed.
+
+#ifndef YY_EVAL_PARSER_H_INCLUDED
+# define YY_EVAL_PARSER_H_INCLUDED
+// "%code requires" blocks.
+#line 17 "parser.yy"
+
+#include <string>
+#include <eval/token.h>
+#include <eval/eval_context_decl.h>
+#include <dhcp/option.h>
+#include <boost/lexical_cast.hpp>
+
+using namespace isc::dhcp;
+using namespace isc::eval;
+
+#line 60 "parser.h"
+
+# include <cassert>
+# include <cstdlib> // std::abort
+# include <iostream>
+# include <stdexcept>
+# include <string>
+# include <vector>
+
+#if defined __cplusplus
+# define YY_CPLUSPLUS __cplusplus
+#else
+# define YY_CPLUSPLUS 199711L
+#endif
+
+// Support move semantics when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_MOVE           std::move
+# define YY_MOVE_OR_COPY   move
+# define YY_MOVE_REF(Type) Type&&
+# define YY_RVREF(Type)    Type&&
+# define YY_COPY(Type)     Type
+#else
+# define YY_MOVE
+# define YY_MOVE_OR_COPY   copy
+# define YY_MOVE_REF(Type) Type&
+# define YY_RVREF(Type)    const Type&
+# define YY_COPY(Type)     const Type&
+#endif
+
+// Support noexcept when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_NOEXCEPT noexcept
+# define YY_NOTHROW
+#else
+# define YY_NOEXCEPT
+# define YY_NOTHROW throw ()
+#endif
+
+// Support constexpr when possible.
+#if 201703 <= YY_CPLUSPLUS
+# define YY_CONSTEXPR constexpr
+#else
+# define YY_CONSTEXPR
+#endif
+# include "location.hh"
+#include <typeinfo>
+#ifndef EVAL_ASSERT
+# include <cassert>
+# define EVAL_ASSERT assert
+#endif
+
+
+#ifndef YY_ATTRIBUTE_PURE
+# if defined __GNUC__ && 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
+#  define YY_ATTRIBUTE_PURE __attribute__ ((__pure__))
+# else
+#  define YY_ATTRIBUTE_PURE
+# endif
+#endif
+
+#ifndef YY_ATTRIBUTE_UNUSED
+# if defined __GNUC__ && 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
+#  define YY_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+# else
+#  define YY_ATTRIBUTE_UNUSED
+# endif
+#endif
+
+/* Suppress unused-variable warnings by "using" E.  */
+#if ! defined lint || defined __GNUC__
+# define YY_USE(E) ((void) (E))
+#else
+# define YY_USE(E) /* empty */
+#endif
+
+/* Suppress an incorrect diagnostic about yylval being uninitialized.  */
+#if defined __GNUC__ && ! defined __ICC && 406 <= __GNUC__ * 100 + __GNUC_MINOR__
+# if __GNUC__ * 100 + __GNUC_MINOR__ < 407
+#  define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN                           \
+    _Pragma ("GCC diagnostic push")                                     \
+    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")
+# else
+#  define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN                           \
+    _Pragma ("GCC diagnostic push")                                     \
+    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")              \
+    _Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
+# endif
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END      \
+    _Pragma ("GCC diagnostic pop")
+#else
+# define YY_INITIAL_VALUE(Value) Value
+#endif
+#ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END
+#endif
+#ifndef YY_INITIAL_VALUE
+# define YY_INITIAL_VALUE(Value) /* Nothing. */
+#endif
+
+#if defined __cplusplus && defined __GNUC__ && ! defined __ICC && 6 <= __GNUC__
+# define YY_IGNORE_USELESS_CAST_BEGIN                          \
+    _Pragma ("GCC diagnostic push")                            \
+    _Pragma ("GCC diagnostic ignored \"-Wuseless-cast\"")
+# define YY_IGNORE_USELESS_CAST_END            \
+    _Pragma ("GCC diagnostic pop")
+#endif
+#ifndef YY_IGNORE_USELESS_CAST_BEGIN
+# define YY_IGNORE_USELESS_CAST_BEGIN
+# define YY_IGNORE_USELESS_CAST_END
+#endif
+
+# ifndef YY_CAST
+#  ifdef __cplusplus
+#   define YY_CAST(Type, Val) static_cast<Type> (Val)
+#   define YY_REINTERPRET_CAST(Type, Val) reinterpret_cast<Type> (Val)
+#  else
+#   define YY_CAST(Type, Val) ((Type) (Val))
+#   define YY_REINTERPRET_CAST(Type, Val) ((Type) (Val))
+#  endif
+# endif
+# ifndef YY_NULLPTR
+#  if defined __cplusplus
+#   if 201103L <= __cplusplus
+#    define YY_NULLPTR nullptr
+#   else
+#    define YY_NULLPTR 0
+#   endif
+#  else
+#   define YY_NULLPTR ((void*)0)
+#  endif
+# endif
+
+/* Debug traces.  */
+#ifndef EVALDEBUG
+# if defined YYDEBUG
+#if YYDEBUG
+#   define EVALDEBUG 1
+#  else
+#   define EVALDEBUG 0
+#  endif
+# else /* ! defined YYDEBUG */
+#  define EVALDEBUG 1
+# endif /* ! defined YYDEBUG */
+#endif  /* ! defined EVALDEBUG */
+
+#line 14 "parser.yy"
+namespace isc { namespace eval {
+#line 209 "parser.h"
+
+
+
+
+  /// A Bison parser.
+  class EvalParser
+  {
+  public:
+#ifdef EVALSTYPE
+# ifdef __GNUC__
+#  pragma GCC message "bison: do not #define EVALSTYPE in C++, use %define api.value.type"
+# endif
+    typedef EVALSTYPE value_type;
+#else
+  /// A buffer to store and retrieve objects.
+  ///
+  /// Sort of a variant, but does not keep track of the nature
+  /// of the stored data, since that knowledge is available
+  /// via the current parser state.
+  class value_type
+  {
+  public:
+    /// Type of *this.
+    typedef value_type self_type;
+
+    /// Empty construction.
+    value_type () YY_NOEXCEPT
+      : yyraw_ ()
+      , yytypeid_ (YY_NULLPTR)
+    {}
+
+    /// Construct and fill.
+    template <typename T>
+    value_type (YY_RVREF (T) t)
+      : yytypeid_ (&typeid (T))
+    {
+      EVAL_ASSERT (sizeof (T) <= size);
+      new (yyas_<T> ()) T (YY_MOVE (t));
+    }
+
+#if 201103L <= YY_CPLUSPLUS
+    /// Non copyable.
+    value_type (const self_type&) = delete;
+    /// Non copyable.
+    self_type& operator= (const self_type&) = delete;
+#endif
+
+    /// Destruction, allowed only if empty.
+    ~value_type () YY_NOEXCEPT
+    {
+      EVAL_ASSERT (!yytypeid_);
+    }
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Instantiate a \a T in here from \a t.
+    template <typename T, typename... U>
+    T&
+    emplace (U&&... u)
+    {
+      EVAL_ASSERT (!yytypeid_);
+      EVAL_ASSERT (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);
+      return *new (yyas_<T> ()) T (std::forward <U>(u)...);
+    }
+# else
+    /// Instantiate an empty \a T in here.
+    template <typename T>
+    T&
+    emplace ()
+    {
+      EVAL_ASSERT (!yytypeid_);
+      EVAL_ASSERT (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);
+      return *new (yyas_<T> ()) T ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    template <typename T>
+    T&
+    emplace (const T& t)
+    {
+      EVAL_ASSERT (!yytypeid_);
+      EVAL_ASSERT (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);
+      return *new (yyas_<T> ()) T (t);
+    }
+# endif
+
+    /// Instantiate an empty \a T in here.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build ()
+    {
+      return emplace<T> ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build (const T& t)
+    {
+      return emplace<T> (t);
+    }
+
+    /// Accessor to a built \a T.
+    template <typename T>
+    T&
+    as () YY_NOEXCEPT
+    {
+      EVAL_ASSERT (yytypeid_);
+      EVAL_ASSERT (*yytypeid_ == typeid (T));
+      EVAL_ASSERT (sizeof (T) <= size);
+      return *yyas_<T> ();
+    }
+
+    /// Const accessor to a built \a T (for %printer).
+    template <typename T>
+    const T&
+    as () const YY_NOEXCEPT
+    {
+      EVAL_ASSERT (yytypeid_);
+      EVAL_ASSERT (*yytypeid_ == typeid (T));
+      EVAL_ASSERT (sizeof (T) <= size);
+      return *yyas_<T> ();
+    }
+
+    /// Swap the content with \a that, of same type.
+    ///
+    /// Both variants must be built beforehand, because swapping the actual
+    /// data requires reading it (with as()), and this is not possible on
+    /// unconstructed variants: it would require some dynamic testing, which
+    /// should not be the variant's responsibility.
+    /// Swapping between built and (possibly) non-built is done with
+    /// self_type::move ().
+    template <typename T>
+    void
+    swap (self_type& that) YY_NOEXCEPT
+    {
+      EVAL_ASSERT (yytypeid_);
+      EVAL_ASSERT (*yytypeid_ == *that.yytypeid_);
+      std::swap (as<T> (), that.as<T> ());
+    }
+
+    /// Move the content of \a that to this.
+    ///
+    /// Destroys \a that.
+    template <typename T>
+    void
+    move (self_type& that)
+    {
+# if 201103L <= YY_CPLUSPLUS
+      emplace<T> (std::move (that.as<T> ()));
+# else
+      emplace<T> ();
+      swap<T> (that);
+# endif
+      that.destroy<T> ();
+    }
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Move the content of \a that to this.
+    template <typename T>
+    void
+    move (self_type&& that)
+    {
+      emplace<T> (std::move (that.as<T> ()));
+      that.destroy<T> ();
+    }
+#endif
+
+    /// Copy the content of \a that to this.
+    template <typename T>
+    void
+    copy (const self_type& that)
+    {
+      emplace<T> (that.as<T> ());
+    }
+
+    /// Destroy the stored \a T.
+    template <typename T>
+    void
+    destroy ()
+    {
+      as<T> ().~T ();
+      yytypeid_ = YY_NULLPTR;
+    }
+
+  private:
+#if YY_CPLUSPLUS < 201103L
+    /// Non copyable.
+    value_type (const self_type&);
+    /// Non copyable.
+    self_type& operator= (const self_type&);
+#endif
+
+    /// Accessor to raw memory as \a T.
+    template <typename T>
+    T*
+    yyas_ () YY_NOEXCEPT
+    {
+      void *yyp = yyraw_;
+      return static_cast<T*> (yyp);
+     }
+
+    /// Const accessor to raw memory as \a T.
+    template <typename T>
+    const T*
+    yyas_ () const YY_NOEXCEPT
+    {
+      const void *yyp = yyraw_;
+      return static_cast<const T*> (yyp);
+     }
+
+    /// An auxiliary type to compute the largest semantic type.
+    union union_type
+    {
+      // option_repr_type
+      char dummy1[sizeof (TokenOption::RepresentationType)];
+
+      // pkt4_field
+      char dummy2[sizeof (TokenPkt4::FieldType)];
+
+      // pkt6_field
+      char dummy3[sizeof (TokenPkt6::FieldType)];
+
+      // pkt_metadata
+      char dummy4[sizeof (TokenPkt::MetadataType)];
+
+      // relay6_field
+      char dummy5[sizeof (TokenRelay6Field::FieldType)];
+
+      // nest_level
+      char dummy6[sizeof (int8_t)];
+
+      // "constant string"
+      // "integer"
+      // "constant hexstring"
+      // "option name"
+      // "ip address"
+      char dummy7[sizeof (std::string)];
+
+      // option_code
+      // sub_option_code
+      char dummy8[sizeof (uint16_t)];
+
+      // integer_expr
+      // enterprise_id
+      char dummy9[sizeof (uint32_t)];
+    };
+
+    /// The size of the largest semantic type.
+    enum { size = sizeof (union_type) };
+
+    /// A buffer to store semantic values.
+    union
+    {
+      /// Strongest alignment constraints.
+      long double yyalign_me_;
+      /// A buffer large enough to store any of the semantic values.
+      char yyraw_[size];
+    };
+
+    /// Whether the content is built: if defined, the name of the stored type.
+    const std::type_info *yytypeid_;
+  };
+
+#endif
+    /// Backward compatibility (Bison 3.8).
+    typedef value_type semantic_type;
+
+    /// Symbol locations.
+    typedef location location_type;
+
+    /// Syntax errors thrown from user actions.
+    struct syntax_error : std::runtime_error
+    {
+      syntax_error (const location_type& l, const std::string& m)
+        : std::runtime_error (m)
+        , location (l)
+      {}
+
+      syntax_error (const syntax_error& s)
+        : std::runtime_error (s.what ())
+        , location (s.location)
+      {}
+
+      ~syntax_error () YY_NOEXCEPT YY_NOTHROW;
+
+      location_type location;
+    };
+
+    /// Token kinds.
+    struct token
+    {
+      enum token_kind_type
+      {
+        TOKEN_EVALEMPTY = -2,
+    TOKEN_END = 0,                 // "end of file"
+    TOKEN_EVALerror = 256,         // error
+    TOKEN_EVALUNDEF = 257,         // "invalid token"
+    TOKEN_LPAREN = 258,            // "("
+    TOKEN_RPAREN = 259,            // ")"
+    TOKEN_NOT = 260,               // "not"
+    TOKEN_AND = 261,               // "and"
+    TOKEN_OR = 262,                // "or"
+    TOKEN_EQUAL = 263,             // "=="
+    TOKEN_OPTION = 264,            // "option"
+    TOKEN_RELAY4 = 265,            // "relay4"
+    TOKEN_RELAY6 = 266,            // "relay6"
+    TOKEN_MEMBER = 267,            // "member"
+    TOKEN_PEERADDR = 268,          // "peeraddr"
+    TOKEN_LINKADDR = 269,          // "linkaddr"
+    TOKEN_LBRACKET = 270,          // "["
+    TOKEN_RBRACKET = 271,          // "]"
+    TOKEN_DOT = 272,               // "."
+    TOKEN_TEXT = 273,              // "text"
+    TOKEN_HEX = 274,               // "hex"
+    TOKEN_EXISTS = 275,            // "exists"
+    TOKEN_PKT = 276,               // "pkt"
+    TOKEN_IFACE = 277,             // "iface"
+    TOKEN_SRC = 278,               // "src"
+    TOKEN_DST = 279,               // "dst"
+    TOKEN_LEN = 280,               // "len"
+    TOKEN_PKT4 = 281,              // "pkt4"
+    TOKEN_CHADDR = 282,            // "mac"
+    TOKEN_HLEN = 283,              // "hlen"
+    TOKEN_HTYPE = 284,             // "htype"
+    TOKEN_CIADDR = 285,            // "ciaddr"
+    TOKEN_GIADDR = 286,            // "giaddr"
+    TOKEN_YIADDR = 287,            // "yiaddr"
+    TOKEN_SIADDR = 288,            // "siaddr"
+    TOKEN_SUBSTRING = 289,         // "substring"
+    TOKEN_SPLIT = 290,             // "split"
+    TOKEN_ALL = 291,               // "all"
+    TOKEN_COMA = 292,              // ","
+    TOKEN_CONCAT = 293,            // "concat"
+    TOKEN_PLUS = 294,              // "+"
+    TOKEN_IFELSE = 295,            // "ifelse"
+    TOKEN_TOHEXSTRING = 296,       // "hexstring"
+    TOKEN_ADDRTOTEXT = 297,        // "addrtotext"
+    TOKEN_INT8TOTEXT = 298,        // "int8totext"
+    TOKEN_INT16TOTEXT = 299,       // "int16totext"
+    TOKEN_INT32TOTEXT = 300,       // "int32totext"
+    TOKEN_UINT8TOTEXT = 301,       // "uint8totext"
+    TOKEN_UINT16TOTEXT = 302,      // "uint16totext"
+    TOKEN_UINT32TOTEXT = 303,      // "uint32totext"
+    TOKEN_PKT6 = 304,              // "pkt6"
+    TOKEN_MSGTYPE = 305,           // "msgtype"
+    TOKEN_TRANSID = 306,           // "transid"
+    TOKEN_VENDOR_CLASS = 307,      // "vendor-class"
+    TOKEN_VENDOR = 308,            // "vendor"
+    TOKEN_ANY = 309,               // "*"
+    TOKEN_DATA = 310,              // "data"
+    TOKEN_ENTERPRISE = 311,        // "enterprise"
+    TOKEN_TOPLEVEL_BOOL = 312,     // "top-level bool"
+    TOKEN_TOPLEVEL_STRING = 313,   // "top-level string"
+    TOKEN_STRING = 314,            // "constant string"
+    TOKEN_INTEGER = 315,           // "integer"
+    TOKEN_HEXSTRING = 316,         // "constant hexstring"
+    TOKEN_OPTION_NAME = 317,       // "option name"
+    TOKEN_IP_ADDRESS = 318         // "ip address"
+      };
+      /// Backward compatibility alias (Bison 3.6).
+      typedef token_kind_type yytokentype;
+    };
+
+    /// Token kind, as returned by yylex.
+    typedef token::token_kind_type token_kind_type;
+
+    /// Backward compatibility alias (Bison 3.6).
+    typedef token_kind_type token_type;
+
+    /// Symbol kinds.
+    struct symbol_kind
+    {
+      enum symbol_kind_type
+      {
+        YYNTOKENS = 64, ///< Number of tokens.
+        S_YYEMPTY = -2,
+        S_YYEOF = 0,                             // "end of file"
+        S_YYerror = 1,                           // error
+        S_YYUNDEF = 2,                           // "invalid token"
+        S_LPAREN = 3,                            // "("
+        S_RPAREN = 4,                            // ")"
+        S_NOT = 5,                               // "not"
+        S_AND = 6,                               // "and"
+        S_OR = 7,                                // "or"
+        S_EQUAL = 8,                             // "=="
+        S_OPTION = 9,                            // "option"
+        S_RELAY4 = 10,                           // "relay4"
+        S_RELAY6 = 11,                           // "relay6"
+        S_MEMBER = 12,                           // "member"
+        S_PEERADDR = 13,                         // "peeraddr"
+        S_LINKADDR = 14,                         // "linkaddr"
+        S_LBRACKET = 15,                         // "["
+        S_RBRACKET = 16,                         // "]"
+        S_DOT = 17,                              // "."
+        S_TEXT = 18,                             // "text"
+        S_HEX = 19,                              // "hex"
+        S_EXISTS = 20,                           // "exists"
+        S_PKT = 21,                              // "pkt"
+        S_IFACE = 22,                            // "iface"
+        S_SRC = 23,                              // "src"
+        S_DST = 24,                              // "dst"
+        S_LEN = 25,                              // "len"
+        S_PKT4 = 26,                             // "pkt4"
+        S_CHADDR = 27,                           // "mac"
+        S_HLEN = 28,                             // "hlen"
+        S_HTYPE = 29,                            // "htype"
+        S_CIADDR = 30,                           // "ciaddr"
+        S_GIADDR = 31,                           // "giaddr"
+        S_YIADDR = 32,                           // "yiaddr"
+        S_SIADDR = 33,                           // "siaddr"
+        S_SUBSTRING = 34,                        // "substring"
+        S_SPLIT = 35,                            // "split"
+        S_ALL = 36,                              // "all"
+        S_COMA = 37,                             // ","
+        S_CONCAT = 38,                           // "concat"
+        S_PLUS = 39,                             // "+"
+        S_IFELSE = 40,                           // "ifelse"
+        S_TOHEXSTRING = 41,                      // "hexstring"
+        S_ADDRTOTEXT = 42,                       // "addrtotext"
+        S_INT8TOTEXT = 43,                       // "int8totext"
+        S_INT16TOTEXT = 44,                      // "int16totext"
+        S_INT32TOTEXT = 45,                      // "int32totext"
+        S_UINT8TOTEXT = 46,                      // "uint8totext"
+        S_UINT16TOTEXT = 47,                     // "uint16totext"
+        S_UINT32TOTEXT = 48,                     // "uint32totext"
+        S_PKT6 = 49,                             // "pkt6"
+        S_MSGTYPE = 50,                          // "msgtype"
+        S_TRANSID = 51,                          // "transid"
+        S_VENDOR_CLASS = 52,                     // "vendor-class"
+        S_VENDOR = 53,                           // "vendor"
+        S_ANY = 54,                              // "*"
+        S_DATA = 55,                             // "data"
+        S_ENTERPRISE = 56,                       // "enterprise"
+        S_TOPLEVEL_BOOL = 57,                    // "top-level bool"
+        S_TOPLEVEL_STRING = 58,                  // "top-level string"
+        S_STRING = 59,                           // "constant string"
+        S_INTEGER = 60,                          // "integer"
+        S_HEXSTRING = 61,                        // "constant hexstring"
+        S_OPTION_NAME = 62,                      // "option name"
+        S_IP_ADDRESS = 63,                       // "ip address"
+        S_YYACCEPT = 64,                         // $accept
+        S_start = 65,                            // start
+        S_expression = 66,                       // expression
+        S_bool_expr = 67,                        // bool_expr
+        S_string_expr = 68,                      // string_expr
+        S_integer_expr = 69,                     // integer_expr
+        S_option_code = 70,                      // option_code
+        S_sub_option_code = 71,                  // sub_option_code
+        S_option_repr_type = 72,                 // option_repr_type
+        S_nest_level = 73,                       // nest_level
+        S_pkt_metadata = 74,                     // pkt_metadata
+        S_enterprise_id = 75,                    // enterprise_id
+        S_pkt4_field = 76,                       // pkt4_field
+        S_pkt6_field = 77,                       // pkt6_field
+        S_relay6_field = 78,                     // relay6_field
+        S_start_expr = 79,                       // start_expr
+        S_length_expr = 80,                      // length_expr
+        S_int_expr = 81                          // int_expr
+      };
+    };
+
+    /// (Internal) symbol kind.
+    typedef symbol_kind::symbol_kind_type symbol_kind_type;
+
+    /// The number of tokens.
+    static const symbol_kind_type YYNTOKENS = symbol_kind::YYNTOKENS;
+
+    /// A complete symbol.
+    ///
+    /// Expects its Base type to provide access to the symbol kind
+    /// via kind ().
+    ///
+    /// Provide access to semantic value and location.
+    template <typename Base>
+    struct basic_symbol : Base
+    {
+      /// Alias to Base.
+      typedef Base super_type;
+
+      /// Default constructor.
+      basic_symbol () YY_NOEXCEPT
+        : value ()
+        , location ()
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      basic_symbol (basic_symbol&& that)
+        : Base (std::move (that))
+        , value ()
+        , location (std::move (that.location))
+      {
+        switch (this->kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.move< TokenOption::RepresentationType > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.move< TokenPkt4::FieldType > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.move< TokenPkt6::FieldType > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.move< TokenPkt::MetadataType > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.move< TokenRelay6Field::FieldType > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.move< int8_t > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.move< std::string > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.move< uint16_t > (std::move (that.value));
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.move< uint32_t > (std::move (that.value));
+        break;
+
+      default:
+        break;
+    }
+
+      }
+#endif
+
+      /// Copy constructor.
+      basic_symbol (const basic_symbol& that);
+
+      /// Constructors for typed symbols.
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, location_type&& l)
+        : Base (t)
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const location_type& l)
+        : Base (t)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, TokenOption::RepresentationType&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const TokenOption::RepresentationType& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, TokenPkt4::FieldType&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const TokenPkt4::FieldType& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, TokenPkt6::FieldType&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const TokenPkt6::FieldType& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, TokenPkt::MetadataType&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const TokenPkt::MetadataType& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, TokenRelay6Field::FieldType&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const TokenRelay6Field::FieldType& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, int8_t&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const int8_t& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, std::string&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const std::string& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, uint16_t&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const uint16_t& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (typename Base::kind_type t, uint32_t&& v, location_type&& l)
+        : Base (t)
+        , value (std::move (v))
+        , location (std::move (l))
+      {}
+#else
+      basic_symbol (typename Base::kind_type t, const uint32_t& v, const location_type& l)
+        : Base (t)
+        , value (v)
+        , location (l)
+      {}
+#endif
+
+      /// Destroy the symbol.
+      ~basic_symbol ()
+      {
+        clear ();
+      }
+
+
+
+      /// Destroy contents, and record that is empty.
+      void clear () YY_NOEXCEPT
+      {
+        // User destructor.
+        symbol_kind_type yykind = this->kind ();
+        basic_symbol<Base>& yysym = *this;
+        (void) yysym;
+        switch (yykind)
+        {
+       default:
+          break;
+        }
+
+        // Value type destructor.
+switch (yykind)
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.template destroy< TokenOption::RepresentationType > ();
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.template destroy< TokenPkt4::FieldType > ();
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.template destroy< TokenPkt6::FieldType > ();
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.template destroy< TokenPkt::MetadataType > ();
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.template destroy< TokenRelay6Field::FieldType > ();
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.template destroy< int8_t > ();
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.template destroy< std::string > ();
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.template destroy< uint16_t > ();
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.template destroy< uint32_t > ();
+        break;
+
+      default:
+        break;
+    }
+
+        Base::clear ();
+      }
+
+      /// The user-facing name of this symbol.
+      std::string name () const YY_NOEXCEPT
+      {
+        return EvalParser::symbol_name (this->kind ());
+      }
+
+      /// Backward compatibility (Bison 3.6).
+      symbol_kind_type type_get () const YY_NOEXCEPT;
+
+      /// Whether empty.
+      bool empty () const YY_NOEXCEPT;
+
+      /// Destructive move, \a s is emptied into this.
+      void move (basic_symbol& s);
+
+      /// The semantic value.
+      value_type value;
+
+      /// The location.
+      location_type location;
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Assignment operator.
+      basic_symbol& operator= (const basic_symbol& that);
+#endif
+    };
+
+    /// Type access provider for token (enum) based symbols.
+    struct by_kind
+    {
+      /// The symbol kind as needed by the constructor.
+      typedef token_kind_type kind_type;
+
+      /// Default constructor.
+      by_kind () YY_NOEXCEPT;
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      by_kind (by_kind&& that) YY_NOEXCEPT;
+#endif
+
+      /// Copy constructor.
+      by_kind (const by_kind& that) YY_NOEXCEPT;
+
+      /// Constructor from (external) token numbers.
+      by_kind (kind_type t) YY_NOEXCEPT;
+
+
+
+      /// Record that this symbol is empty.
+      void clear () YY_NOEXCEPT;
+
+      /// Steal the symbol kind from \a that.
+      void move (by_kind& that);
+
+      /// The (internal) type number (corresponding to \a type).
+      /// \a empty when empty.
+      symbol_kind_type kind () const YY_NOEXCEPT;
+
+      /// Backward compatibility (Bison 3.6).
+      symbol_kind_type type_get () const YY_NOEXCEPT;
+
+      /// The symbol kind.
+      /// \a S_YYEMPTY when empty.
+      symbol_kind_type kind_;
+    };
+
+    /// Backward compatibility for a private implementation detail (Bison 3.6).
+    typedef by_kind by_type;
+
+    /// "External" symbols: returned by the scanner.
+    struct symbol_type : basic_symbol<by_kind>
+    {
+      /// Superclass.
+      typedef basic_symbol<by_kind> super_type;
+
+      /// Empty symbol.
+      symbol_type () YY_NOEXCEPT {}
+
+      /// Constructor for valueless symbols, and symbols from each type.
+#if 201103L <= YY_CPLUSPLUS
+      symbol_type (int tok, location_type l)
+        : super_type (token_kind_type (tok), std::move (l))
+#else
+      symbol_type (int tok, const location_type& l)
+        : super_type (token_kind_type (tok), l)
+#endif
+      {
+#if !defined _MSC_VER || defined __clang__
+        EVAL_ASSERT (tok == token::TOKEN_END
+                   || (token::TOKEN_EVALerror <= tok && tok <= token::TOKEN_TOPLEVEL_STRING));
+#endif
+      }
+#if 201103L <= YY_CPLUSPLUS
+      symbol_type (int tok, std::string v, location_type l)
+        : super_type (token_kind_type (tok), std::move (v), std::move (l))
+#else
+      symbol_type (int tok, const std::string& v, const location_type& l)
+        : super_type (token_kind_type (tok), v, l)
+#endif
+      {
+#if !defined _MSC_VER || defined __clang__
+        EVAL_ASSERT ((token::TOKEN_STRING <= tok && tok <= token::TOKEN_IP_ADDRESS));
+#endif
+      }
+    };
+
+    /// Build a parser object.
+    EvalParser (EvalContext& ctx_yyarg);
+    virtual ~EvalParser ();
+
+#if 201103L <= YY_CPLUSPLUS
+    /// Non copyable.
+    EvalParser (const EvalParser&) = delete;
+    /// Non copyable.
+    EvalParser& operator= (const EvalParser&) = delete;
+#endif
+
+    /// Parse.  An alias for parse ().
+    /// \returns  0 iff parsing succeeded.
+    int operator() ();
+
+    /// Parse.
+    /// \returns  0 iff parsing succeeded.
+    virtual int parse ();
+
+#if EVALDEBUG
+    /// The current debugging stream.
+    std::ostream& debug_stream () const YY_ATTRIBUTE_PURE;
+    /// Set the current debugging stream.
+    void set_debug_stream (std::ostream &);
+
+    /// Type for debugging levels.
+    typedef int debug_level_type;
+    /// The current debugging level.
+    debug_level_type debug_level () const YY_ATTRIBUTE_PURE;
+    /// Set the current debugging level.
+    void set_debug_level (debug_level_type l);
+#endif
+
+    /// Report a syntax error.
+    /// \param loc    where the syntax error is found.
+    /// \param msg    a description of the syntax error.
+    virtual void error (const location_type& loc, const std::string& msg);
+
+    /// Report a syntax error.
+    void error (const syntax_error& err);
+
+    /// The user-facing name of the symbol whose (internal) number is
+    /// YYSYMBOL.  No bounds checking.
+    static std::string symbol_name (symbol_kind_type yysymbol);
+
+    // Implementation of make_symbol for each token kind.
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_END (location_type l)
+      {
+        return symbol_type (token::TOKEN_END, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_END (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_END, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_EVALerror (location_type l)
+      {
+        return symbol_type (token::TOKEN_EVALerror, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_EVALerror (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_EVALerror, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_EVALUNDEF (location_type l)
+      {
+        return symbol_type (token::TOKEN_EVALUNDEF, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_EVALUNDEF (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_EVALUNDEF, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_LPAREN (location_type l)
+      {
+        return symbol_type (token::TOKEN_LPAREN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_LPAREN (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_LPAREN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_RPAREN (location_type l)
+      {
+        return symbol_type (token::TOKEN_RPAREN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_RPAREN (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_RPAREN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_NOT (location_type l)
+      {
+        return symbol_type (token::TOKEN_NOT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_NOT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_NOT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_AND (location_type l)
+      {
+        return symbol_type (token::TOKEN_AND, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_AND (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_AND, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_OR (location_type l)
+      {
+        return symbol_type (token::TOKEN_OR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_OR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_OR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_EQUAL (location_type l)
+      {
+        return symbol_type (token::TOKEN_EQUAL, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_EQUAL (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_EQUAL, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_OPTION (location_type l)
+      {
+        return symbol_type (token::TOKEN_OPTION, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_OPTION (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_OPTION, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_RELAY4 (location_type l)
+      {
+        return symbol_type (token::TOKEN_RELAY4, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_RELAY4 (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_RELAY4, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_RELAY6 (location_type l)
+      {
+        return symbol_type (token::TOKEN_RELAY6, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_RELAY6 (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_RELAY6, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_MEMBER (location_type l)
+      {
+        return symbol_type (token::TOKEN_MEMBER, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_MEMBER (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_MEMBER, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_PEERADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_PEERADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_PEERADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_PEERADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_LINKADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_LINKADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_LINKADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_LINKADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_LBRACKET (location_type l)
+      {
+        return symbol_type (token::TOKEN_LBRACKET, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_LBRACKET (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_LBRACKET, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_RBRACKET (location_type l)
+      {
+        return symbol_type (token::TOKEN_RBRACKET, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_RBRACKET (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_RBRACKET, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_DOT (location_type l)
+      {
+        return symbol_type (token::TOKEN_DOT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_DOT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_DOT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_TEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_TEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_HEX (location_type l)
+      {
+        return symbol_type (token::TOKEN_HEX, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_HEX (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_HEX, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_EXISTS (location_type l)
+      {
+        return symbol_type (token::TOKEN_EXISTS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_EXISTS (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_EXISTS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_PKT (location_type l)
+      {
+        return symbol_type (token::TOKEN_PKT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_PKT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_PKT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_IFACE (location_type l)
+      {
+        return symbol_type (token::TOKEN_IFACE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_IFACE (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_IFACE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_SRC (location_type l)
+      {
+        return symbol_type (token::TOKEN_SRC, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_SRC (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_SRC, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_DST (location_type l)
+      {
+        return symbol_type (token::TOKEN_DST, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_DST (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_DST, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_LEN (location_type l)
+      {
+        return symbol_type (token::TOKEN_LEN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_LEN (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_LEN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_PKT4 (location_type l)
+      {
+        return symbol_type (token::TOKEN_PKT4, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_PKT4 (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_PKT4, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_CHADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_CHADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_CHADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_CHADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_HLEN (location_type l)
+      {
+        return symbol_type (token::TOKEN_HLEN, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_HLEN (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_HLEN, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_HTYPE (location_type l)
+      {
+        return symbol_type (token::TOKEN_HTYPE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_HTYPE (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_HTYPE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_CIADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_CIADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_CIADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_CIADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_GIADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_GIADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_GIADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_GIADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_YIADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_YIADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_YIADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_YIADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_SIADDR (location_type l)
+      {
+        return symbol_type (token::TOKEN_SIADDR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_SIADDR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_SIADDR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_SUBSTRING (location_type l)
+      {
+        return symbol_type (token::TOKEN_SUBSTRING, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_SUBSTRING (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_SUBSTRING, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_SPLIT (location_type l)
+      {
+        return symbol_type (token::TOKEN_SPLIT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_SPLIT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_SPLIT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_ALL (location_type l)
+      {
+        return symbol_type (token::TOKEN_ALL, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_ALL (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_ALL, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_COMA (location_type l)
+      {
+        return symbol_type (token::TOKEN_COMA, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_COMA (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_COMA, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_CONCAT (location_type l)
+      {
+        return symbol_type (token::TOKEN_CONCAT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_CONCAT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_CONCAT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_PLUS (location_type l)
+      {
+        return symbol_type (token::TOKEN_PLUS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_PLUS (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_PLUS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_IFELSE (location_type l)
+      {
+        return symbol_type (token::TOKEN_IFELSE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_IFELSE (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_IFELSE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TOHEXSTRING (location_type l)
+      {
+        return symbol_type (token::TOKEN_TOHEXSTRING, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TOHEXSTRING (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_TOHEXSTRING, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_ADDRTOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_ADDRTOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_ADDRTOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_ADDRTOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_INT8TOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_INT8TOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_INT8TOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_INT8TOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_INT16TOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_INT16TOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_INT16TOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_INT16TOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_INT32TOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_INT32TOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_INT32TOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_INT32TOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_UINT8TOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_UINT8TOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_UINT8TOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_UINT8TOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_UINT16TOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_UINT16TOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_UINT16TOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_UINT16TOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_UINT32TOTEXT (location_type l)
+      {
+        return symbol_type (token::TOKEN_UINT32TOTEXT, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_UINT32TOTEXT (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_UINT32TOTEXT, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_PKT6 (location_type l)
+      {
+        return symbol_type (token::TOKEN_PKT6, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_PKT6 (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_PKT6, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_MSGTYPE (location_type l)
+      {
+        return symbol_type (token::TOKEN_MSGTYPE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_MSGTYPE (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_MSGTYPE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TRANSID (location_type l)
+      {
+        return symbol_type (token::TOKEN_TRANSID, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TRANSID (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_TRANSID, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_VENDOR_CLASS (location_type l)
+      {
+        return symbol_type (token::TOKEN_VENDOR_CLASS, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_VENDOR_CLASS (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_VENDOR_CLASS, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_VENDOR (location_type l)
+      {
+        return symbol_type (token::TOKEN_VENDOR, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_VENDOR (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_VENDOR, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_ANY (location_type l)
+      {
+        return symbol_type (token::TOKEN_ANY, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_ANY (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_ANY, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_DATA (location_type l)
+      {
+        return symbol_type (token::TOKEN_DATA, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_DATA (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_DATA, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_ENTERPRISE (location_type l)
+      {
+        return symbol_type (token::TOKEN_ENTERPRISE, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_ENTERPRISE (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_ENTERPRISE, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TOPLEVEL_BOOL (location_type l)
+      {
+        return symbol_type (token::TOKEN_TOPLEVEL_BOOL, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TOPLEVEL_BOOL (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_TOPLEVEL_BOOL, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_TOPLEVEL_STRING (location_type l)
+      {
+        return symbol_type (token::TOKEN_TOPLEVEL_STRING, std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_TOPLEVEL_STRING (const location_type& l)
+      {
+        return symbol_type (token::TOKEN_TOPLEVEL_STRING, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_STRING (std::string v, location_type l)
+      {
+        return symbol_type (token::TOKEN_STRING, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_STRING (const std::string& v, const location_type& l)
+      {
+        return symbol_type (token::TOKEN_STRING, v, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_INTEGER (std::string v, location_type l)
+      {
+        return symbol_type (token::TOKEN_INTEGER, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_INTEGER (const std::string& v, const location_type& l)
+      {
+        return symbol_type (token::TOKEN_INTEGER, v, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_HEXSTRING (std::string v, location_type l)
+      {
+        return symbol_type (token::TOKEN_HEXSTRING, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_HEXSTRING (const std::string& v, const location_type& l)
+      {
+        return symbol_type (token::TOKEN_HEXSTRING, v, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_OPTION_NAME (std::string v, location_type l)
+      {
+        return symbol_type (token::TOKEN_OPTION_NAME, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_OPTION_NAME (const std::string& v, const location_type& l)
+      {
+        return symbol_type (token::TOKEN_OPTION_NAME, v, l);
+      }
+#endif
+#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_IP_ADDRESS (std::string v, location_type l)
+      {
+        return symbol_type (token::TOKEN_IP_ADDRESS, std::move (v), std::move (l));
+      }
+#else
+      static
+      symbol_type
+      make_IP_ADDRESS (const std::string& v, const location_type& l)
+      {
+        return symbol_type (token::TOKEN_IP_ADDRESS, v, l);
+      }
+#endif
+
+
+    class context
+    {
+    public:
+      context (const EvalParser& yyparser, const symbol_type& yyla);
+      const symbol_type& lookahead () const YY_NOEXCEPT { return yyla_; }
+      symbol_kind_type token () const YY_NOEXCEPT { return yyla_.kind (); }
+      const location_type& location () const YY_NOEXCEPT { return yyla_.location; }
+
+      /// Put in YYARG at most YYARGN of the expected tokens, and return the
+      /// number of tokens stored in YYARG.  If YYARG is null, return the
+      /// number of expected tokens (guaranteed to be less than YYNTOKENS).
+      int expected_tokens (symbol_kind_type yyarg[], int yyargn) const;
+
+    private:
+      const EvalParser& yyparser_;
+      const symbol_type& yyla_;
+    };
+
+  private:
+#if YY_CPLUSPLUS < 201103L
+    /// Non copyable.
+    EvalParser (const EvalParser&);
+    /// Non copyable.
+    EvalParser& operator= (const EvalParser&);
+#endif
+
+
+    /// Stored state numbers (used for stacks).
+    typedef unsigned char state_type;
+
+    /// The arguments of the error message.
+    int yy_syntax_error_arguments_ (const context& yyctx,
+                                    symbol_kind_type yyarg[], int yyargn) const;
+
+    /// Generate an error message.
+    /// \param yyctx     the context in which the error occurred.
+    virtual std::string yysyntax_error_ (const context& yyctx) const;
+    /// Compute post-reduction state.
+    /// \param yystate   the current state
+    /// \param yysym     the nonterminal to push on the stack
+    static state_type yy_lr_goto_state_ (state_type yystate, int yysym);
+
+    /// Whether the given \c yypact_ value indicates a defaulted state.
+    /// \param yyvalue   the value to check
+    static bool yy_pact_value_is_default_ (int yyvalue) YY_NOEXCEPT;
+
+    /// Whether the given \c yytable_ value indicates a syntax error.
+    /// \param yyvalue   the value to check
+    static bool yy_table_value_is_error_ (int yyvalue) YY_NOEXCEPT;
+
+    static const short yypact_ninf_;
+    static const signed char yytable_ninf_;
+
+    /// Convert a scanner token kind \a t to a symbol kind.
+    /// In theory \a t should be a token_kind_type, but character literals
+    /// are valid, yet not members of the token_kind_type enum.
+    static symbol_kind_type yytranslate_ (int t) YY_NOEXCEPT;
+
+    /// Convert the symbol name \a n to a form suitable for a diagnostic.
+    static std::string yytnamerr_ (const char *yystr);
+
+    /// For a symbol, its name in clear.
+    static const char* const yytname_[];
+
+
+    // Tables.
+    // YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
+    // STATE-NUM.
+    static const short yypact_[];
+
+    // YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
+    // Performed when YYTABLE does not specify something else to do.  Zero
+    // means the default is an error.
+    static const signed char yydefact_[];
+
+    // YYPGOTO[NTERM-NUM].
+    static const short yypgoto_[];
+
+    // YYDEFGOTO[NTERM-NUM].
+    static const unsigned char yydefgoto_[];
+
+    // YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM.  If
+    // positive, shift that token.  If negative, reduce the rule whose
+    // number is the opposite.  If YYTABLE_NINF, syntax error.
+    static const unsigned char yytable_[];
+
+    static const short yycheck_[];
+
+    // YYSTOS[STATE-NUM] -- The symbol kind of the accessing symbol of
+    // state STATE-NUM.
+    static const signed char yystos_[];
+
+    // YYR1[RULE-NUM] -- Symbol kind of the left-hand side of rule RULE-NUM.
+    static const signed char yyr1_[];
+
+    // YYR2[RULE-NUM] -- Number of symbols on the right-hand side of rule RULE-NUM.
+    static const signed char yyr2_[];
+
+
+#if EVALDEBUG
+    // YYRLINE[YYN] -- Source line where rule number YYN was defined.
+    static const short yyrline_[];
+    /// Report on the debug stream that the rule \a r is going to be reduced.
+    virtual void yy_reduce_print_ (int r) const;
+    /// Print the state stack on the debug stream.
+    virtual void yy_stack_print_ () const;
+
+    /// Debugging level.
+    int yydebug_;
+    /// Debug stream.
+    std::ostream* yycdebug_;
+
+    /// \brief Display a symbol kind, value and location.
+    /// \param yyo    The output stream.
+    /// \param yysym  The symbol.
+    template <typename Base>
+    void yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const;
+#endif
+
+    /// \brief Reclaim the memory associated to a symbol.
+    /// \param yymsg     Why this token is reclaimed.
+    ///                  If null, print nothing.
+    /// \param yysym     The symbol.
+    template <typename Base>
+    void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;
+
+  private:
+    /// Type access provider for state based symbols.
+    struct by_state
+    {
+      /// Default constructor.
+      by_state () YY_NOEXCEPT;
+
+      /// The symbol kind as needed by the constructor.
+      typedef state_type kind_type;
+
+      /// Constructor.
+      by_state (kind_type s) YY_NOEXCEPT;
+
+      /// Copy constructor.
+      by_state (const by_state& that) YY_NOEXCEPT;
+
+      /// Record that this symbol is empty.
+      void clear () YY_NOEXCEPT;
+
+      /// Steal the symbol kind from \a that.
+      void move (by_state& that);
+
+      /// The symbol kind (corresponding to \a state).
+      /// \a symbol_kind::S_YYEMPTY when empty.
+      symbol_kind_type kind () const YY_NOEXCEPT;
+
+      /// The state number used to denote an empty symbol.
+      /// We use the initial state, as it does not have a value.
+      enum { empty_state = 0 };
+
+      /// The state.
+      /// \a empty when empty.
+      state_type state;
+    };
+
+    /// "Internal" symbol: element of the stack.
+    struct stack_symbol_type : basic_symbol<by_state>
+    {
+      /// Superclass.
+      typedef basic_symbol<by_state> super_type;
+      /// Construct an empty symbol.
+      stack_symbol_type ();
+      /// Move or copy construction.
+      stack_symbol_type (YY_RVREF (stack_symbol_type) that);
+      /// Steal the contents from \a sym to build this.
+      stack_symbol_type (state_type s, YY_MOVE_REF (symbol_type) sym);
+#if YY_CPLUSPLUS < 201103L
+      /// Assignment, needed by push_back by some old implementations.
+      /// Moves the contents of that.
+      stack_symbol_type& operator= (stack_symbol_type& that);
+
+      /// Assignment, needed by push_back by other implementations.
+      /// Needed by some other old implementations.
+      stack_symbol_type& operator= (const stack_symbol_type& that);
+#endif
+    };
+
+    /// A stack with random access from its top.
+    template <typename T, typename S = std::vector<T> >
+    class stack
+    {
+    public:
+      // Hide our reversed order.
+      typedef typename S::iterator iterator;
+      typedef typename S::const_iterator const_iterator;
+      typedef typename S::size_type size_type;
+      typedef typename std::ptrdiff_t index_type;
+
+      stack (size_type n = 200) YY_NOEXCEPT
+        : seq_ (n)
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Non copyable.
+      stack (const stack&) = delete;
+      /// Non copyable.
+      stack& operator= (const stack&) = delete;
+#endif
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      const T&
+      operator[] (index_type i) const
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      T&
+      operator[] (index_type i)
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Steal the contents of \a t.
+      ///
+      /// Close to move-semantics.
+      void
+      push (YY_MOVE_REF (T) t)
+      {
+        seq_.push_back (T ());
+        operator[] (0).move (t);
+      }
+
+      /// Pop elements from the stack.
+      void
+      pop (std::ptrdiff_t n = 1) YY_NOEXCEPT
+      {
+        for (; 0 < n; --n)
+          seq_.pop_back ();
+      }
+
+      /// Pop all elements from the stack.
+      void
+      clear () YY_NOEXCEPT
+      {
+        seq_.clear ();
+      }
+
+      /// Number of elements on the stack.
+      index_type
+      size () const YY_NOEXCEPT
+      {
+        return index_type (seq_.size ());
+      }
+
+      /// Iterator on top of the stack (going downwards).
+      const_iterator
+      begin () const YY_NOEXCEPT
+      {
+        return seq_.begin ();
+      }
+
+      /// Bottom of the stack.
+      const_iterator
+      end () const YY_NOEXCEPT
+      {
+        return seq_.end ();
+      }
+
+      /// Present a slice of the top of a stack.
+      class slice
+      {
+      public:
+        slice (const stack& stack, index_type range) YY_NOEXCEPT
+          : stack_ (stack)
+          , range_ (range)
+        {}
+
+        const T&
+        operator[] (index_type i) const
+        {
+          return stack_[range_ - i];
+        }
+
+      private:
+        const stack& stack_;
+        index_type range_;
+      };
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Non copyable.
+      stack (const stack&);
+      /// Non copyable.
+      stack& operator= (const stack&);
+#endif
+      /// The wrapped container.
+      S seq_;
+    };
+
+
+    /// Stack type.
+    typedef stack<stack_symbol_type> stack_type;
+
+    /// The stack.
+    stack_type yystack_;
+
+    /// Push a new state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param sym  the symbol
+    /// \warning the contents of \a s.value is stolen.
+    void yypush_ (const char* m, YY_MOVE_REF (stack_symbol_type) sym);
+
+    /// Push a new look ahead token on the state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param s    the state
+    /// \param sym  the symbol (for its value and location).
+    /// \warning the contents of \a sym.value is stolen.
+    void yypush_ (const char* m, state_type s, YY_MOVE_REF (symbol_type) sym);
+
+    /// Pop \a n symbols from the stack.
+    void yypop_ (int n = 1) YY_NOEXCEPT;
+
+    /// Constants.
+    enum
+    {
+      yylast_ = 286,     ///< Last index in yytable_.
+      yynnts_ = 18,  ///< Number of nonterminal symbols.
+      yyfinal_ = 42 ///< Termination state number.
+    };
+
+
+    // User arguments.
+    EvalContext& ctx;
+
+  };
+
+  inline
+  EvalParser::symbol_kind_type
+  EvalParser::yytranslate_ (int t) YY_NOEXCEPT
+  {
+    // YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to
+    // TOKEN-NUM as returned by yylex.
+    static
+    const signed char
+    translate_table[] =
+    {
+       0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
+       2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
+       5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
+      15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
+      25,    26,    27,    28,    29,    30,    31,    32,    33,    34,
+      35,    36,    37,    38,    39,    40,    41,    42,    43,    44,
+      45,    46,    47,    48,    49,    50,    51,    52,    53,    54,
+      55,    56,    57,    58,    59,    60,    61,    62,    63
+    };
+    // Last valid token kind.
+    const int code_max = 318;
+
+    if (t <= 0)
+      return symbol_kind::S_YYEOF;
+    else if (t <= code_max)
+      return static_cast <symbol_kind_type> (translate_table[t]);
+    else
+      return symbol_kind::S_YYUNDEF;
+  }
+
+  // basic_symbol.
+  template <typename Base>
+  EvalParser::basic_symbol<Base>::basic_symbol (const basic_symbol& that)
+    : Base (that)
+    , value ()
+    , location (that.location)
+  {
+    switch (this->kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.copy< TokenOption::RepresentationType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.copy< TokenPkt4::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.copy< TokenPkt6::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.copy< TokenPkt::MetadataType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.copy< TokenRelay6Field::FieldType > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.copy< int8_t > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.copy< std::string > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.copy< uint16_t > (YY_MOVE (that.value));
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.copy< uint32_t > (YY_MOVE (that.value));
+        break;
+
+      default:
+        break;
+    }
+
+  }
+
+
+
+
+  template <typename Base>
+  EvalParser::symbol_kind_type
+  EvalParser::basic_symbol<Base>::type_get () const YY_NOEXCEPT
+  {
+    return this->kind ();
+  }
+
+
+  template <typename Base>
+  bool
+  EvalParser::basic_symbol<Base>::empty () const YY_NOEXCEPT
+  {
+    return this->kind () == symbol_kind::S_YYEMPTY;
+  }
+
+  template <typename Base>
+  void
+  EvalParser::basic_symbol<Base>::move (basic_symbol& s)
+  {
+    super_type::move (s);
+    switch (this->kind ())
+    {
+      case symbol_kind::S_option_repr_type: // option_repr_type
+        value.move< TokenOption::RepresentationType > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_pkt4_field: // pkt4_field
+        value.move< TokenPkt4::FieldType > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_pkt6_field: // pkt6_field
+        value.move< TokenPkt6::FieldType > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_pkt_metadata: // pkt_metadata
+        value.move< TokenPkt::MetadataType > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_relay6_field: // relay6_field
+        value.move< TokenRelay6Field::FieldType > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_nest_level: // nest_level
+        value.move< int8_t > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_STRING: // "constant string"
+      case symbol_kind::S_INTEGER: // "integer"
+      case symbol_kind::S_HEXSTRING: // "constant hexstring"
+      case symbol_kind::S_OPTION_NAME: // "option name"
+      case symbol_kind::S_IP_ADDRESS: // "ip address"
+        value.move< std::string > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_option_code: // option_code
+      case symbol_kind::S_sub_option_code: // sub_option_code
+        value.move< uint16_t > (YY_MOVE (s.value));
+        break;
+
+      case symbol_kind::S_integer_expr: // integer_expr
+      case symbol_kind::S_enterprise_id: // enterprise_id
+        value.move< uint32_t > (YY_MOVE (s.value));
+        break;
+
+      default:
+        break;
+    }
+
+    location = YY_MOVE (s.location);
+  }
+
+  // by_kind.
+  inline
+  EvalParser::by_kind::by_kind () YY_NOEXCEPT
+    : kind_ (symbol_kind::S_YYEMPTY)
+  {}
+
+#if 201103L <= YY_CPLUSPLUS
+  inline
+  EvalParser::by_kind::by_kind (by_kind&& that) YY_NOEXCEPT
+    : kind_ (that.kind_)
+  {
+    that.clear ();
+  }
+#endif
+
+  inline
+  EvalParser::by_kind::by_kind (const by_kind& that) YY_NOEXCEPT
+    : kind_ (that.kind_)
+  {}
+
+  inline
+  EvalParser::by_kind::by_kind (token_kind_type t) YY_NOEXCEPT
+    : kind_ (yytranslate_ (t))
+  {}
+
+
+
+  inline
+  void
+  EvalParser::by_kind::clear () YY_NOEXCEPT
+  {
+    kind_ = symbol_kind::S_YYEMPTY;
+  }
+
+  inline
+  void
+  EvalParser::by_kind::move (by_kind& that)
+  {
+    kind_ = that.kind_;
+    that.clear ();
+  }
+
+  inline
+  EvalParser::symbol_kind_type
+  EvalParser::by_kind::kind () const YY_NOEXCEPT
+  {
+    return kind_;
+  }
+
+
+  inline
+  EvalParser::symbol_kind_type
+  EvalParser::by_kind::type_get () const YY_NOEXCEPT
+  {
+    return this->kind ();
+  }
+
+
+#line 14 "parser.yy"
+} } // isc::eval
+#line 2673 "parser.h"
+
+
+
+
+#endif // !YY_EVAL_PARSER_H_INCLUDED
diff --git a/src/lib/eval/parser.yy b/src/lib/eval/parser.yy
new file mode 100644
index 0000000..2015e83
--- /dev/null
+++ b/src/lib/eval/parser.yy
@@ -0,0 +1,649 @@
+/* Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+
+   This Source Code Form is subject to the terms of the Mozilla Public
+   License, v. 2.0. If a copy of the MPL was not distributed with this
+   file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+%skeleton "lalr1.cc" /* -*- C++ -*- */
+%require "3.3.0"
+%defines
+%define api.parser.class {EvalParser}
+%define api.prefix {eval}
+%define api.token.constructor
+%define api.value.type variant
+%define api.namespace {isc::eval}
+%define parse.assert
+%code requires
+{
+#include <string>
+#include <eval/token.h>
+#include <eval/eval_context_decl.h>
+#include <dhcp/option.h>
+#include <boost/lexical_cast.hpp>
+
+using namespace isc::dhcp;
+using namespace isc::eval;
+}
+// The parsing context.
+%param { EvalContext& ctx }
+%locations
+%define parse.trace
+%define parse.error verbose
+%code
+{
+# include "eval_context.h"
+
+// Avoid warnings with the error counter.
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
+}
+
+%define api.token.prefix {TOKEN_}
+// Tokens in an order which makes sense and related to the intended use.
+%token
+  END  0  "end of file"
+  LPAREN  "("
+  RPAREN  ")"
+  NOT "not"
+  AND "and"
+  OR "or"
+  EQUAL "=="
+  OPTION "option"
+  RELAY4 "relay4"
+  RELAY6 "relay6"
+  MEMBER "member"
+  PEERADDR "peeraddr"
+  LINKADDR "linkaddr"
+  LBRACKET "["
+  RBRACKET "]"
+  DOT "."
+  TEXT "text"
+  HEX "hex"
+  EXISTS "exists"
+  PKT "pkt"
+  IFACE "iface"
+  SRC "src"
+  DST "dst"
+  LEN "len"
+  PKT4 "pkt4"
+  CHADDR "mac"
+  HLEN "hlen"
+  HTYPE "htype"
+  CIADDR "ciaddr"
+  GIADDR "giaddr"
+  YIADDR "yiaddr"
+  SIADDR "siaddr"
+  SUBSTRING "substring"
+  SPLIT "split"
+  ALL "all"
+  COMA ","
+  CONCAT "concat"
+  PLUS "+"
+  IFELSE "ifelse"
+  TOHEXSTRING "hexstring"
+  ADDRTOTEXT "addrtotext"
+  INT8TOTEXT "int8totext"
+  INT16TOTEXT "int16totext"
+  INT32TOTEXT "int32totext"
+  UINT8TOTEXT "uint8totext"
+  UINT16TOTEXT "uint16totext"
+  UINT32TOTEXT "uint32totext"
+  PKT6 "pkt6"
+  MSGTYPE "msgtype"
+  TRANSID "transid"
+  VENDOR_CLASS "vendor-class"
+  VENDOR "vendor"
+  ANY "*"
+  DATA "data"
+  ENTERPRISE "enterprise"
+
+  TOPLEVEL_BOOL "top-level bool"
+  TOPLEVEL_STRING "top-level string"
+;
+
+%token <std::string> STRING "constant string"
+%token <std::string> INTEGER "integer"
+%token <std::string> HEXSTRING "constant hexstring"
+%token <std::string> OPTION_NAME "option name"
+%token <std::string> IP_ADDRESS "ip address"
+
+%type <uint16_t> option_code
+%type <uint16_t> sub_option_code
+%type <uint32_t> enterprise_id
+%type <uint32_t> integer_expr
+%type <TokenOption::RepresentationType> option_repr_type
+%type <TokenRelay6Field::FieldType> relay6_field
+%type <int8_t> nest_level
+%type <TokenPkt::MetadataType> pkt_metadata
+%type <TokenPkt4::FieldType> pkt4_field
+%type <TokenPkt6::FieldType> pkt6_field
+
+%left PLUS
+%left OR
+%left AND
+%precedence NOT
+
+%printer { yyoutput << $$; } <*>;
+
+%%
+
+// The whole grammar starts with a 'start' symbol...
+%start start;
+
+// ... that expects either TOPLEVEL_BOOL or TOPLEVEL_STRING. Depending on which
+// token appears first, it will determine what is allowed and what it not.
+start: TOPLEVEL_BOOL expression
+     | TOPLEVEL_STRING string_expr
+;
+
+// Expression can either be a single token or a (something == something) expression
+
+expression : bool_expr
+           ;
+
+bool_expr : "(" bool_expr ")"
+          | NOT bool_expr
+                {
+                    TokenPtr neg(new TokenNot());
+                    ctx.expression.push_back(neg);
+                }
+          | bool_expr AND bool_expr
+                {
+                    TokenPtr neg(new TokenAnd());
+                    ctx.expression.push_back(neg);
+                }
+          | bool_expr OR bool_expr
+                {
+                    TokenPtr neg(new TokenOr());
+                    ctx.expression.push_back(neg);
+                }
+          | string_expr EQUAL string_expr
+                {
+                    TokenPtr eq(new TokenEqual());
+                    ctx.expression.push_back(eq);
+                }
+          | OPTION "[" option_code "]" "." EXISTS
+                {
+                    TokenPtr opt(new TokenOption($3, TokenOption::EXISTS));
+                    ctx.expression.push_back(opt);
+                }
+          | OPTION "[" option_code "]" "." OPTION "[" sub_option_code "]" "." EXISTS
+                {
+                    TokenPtr opt(new TokenSubOption($3, $8, TokenOption::EXISTS));
+                    ctx.expression.push_back(opt);
+                }
+          | RELAY4 "[" sub_option_code "]" "." EXISTS
+                {
+                   switch (ctx.getUniverse()) {
+                   case Option::V4:
+                   {
+                       TokenPtr opt(new TokenRelay4Option($3, TokenOption::EXISTS));
+                       ctx.expression.push_back(opt);
+                       break;
+                   }
+                   case Option::V6:
+                       // We will have relay6[123] for the DHCPv6.
+                       // In a very distant future we'll possibly be able
+                       // to mix both if we have DHCPv4-over-DHCPv6, so it
+                       // has some sense to make it explicit whether we
+                       // talk about DHCPv4 relay or DHCPv6 relay. However,
+                       // for the time being relay4 can be used in DHCPv4
+                       // only.
+                       error(@1, "relay4 can only be used in DHCPv4.");
+                   }
+                }
+          | RELAY6 "[" nest_level "]" "." OPTION "[" sub_option_code "]" "." EXISTS
+                {
+                    switch (ctx.getUniverse()) {
+                    case Option::V6:
+                    {
+                        TokenPtr opt(new TokenRelay6Option($3, $8, TokenOption::EXISTS));
+                        ctx.expression.push_back(opt);
+                        break;
+                    }
+                    case Option::V4:
+                        // For now we only use relay6 in DHCPv6.
+                        error(@1, "relay6 can only be used in DHCPv6.");
+                    }
+                }
+          | VENDOR_CLASS "[" enterprise_id "]" "." EXISTS
+              {
+                  // Expression: vendor-class[1234].exists
+                  //
+                  // This token will find option 124 (DHCPv4) or 16 (DHCPv6),
+                  // and will check if enterprise-id equals specified value.
+                  TokenPtr exist(new TokenVendorClass(ctx.getUniverse(), $3, TokenOption::EXISTS));
+                  ctx.expression.push_back(exist);
+              }
+          | VENDOR "[" enterprise_id "]" "." EXISTS
+              {
+                  // Expression: vendor[1234].exists
+                  //
+                  // This token will find option 125 (DHCPv4) or 17 (DHCPv6),
+                  // and will check if enterprise-id equals specified value.
+                  TokenPtr exist(new TokenVendor(ctx.getUniverse(), $3, TokenOption::EXISTS));
+                  ctx.expression.push_back(exist);
+              }
+          | VENDOR "[" enterprise_id "]" "." OPTION "[" sub_option_code "]" "." EXISTS
+              {
+                  // Expression vendor[1234].option[123].exists
+                  //
+                  // This token will check if specified vendor option
+                  // exists, has specified enterprise-id and if has
+                  // specified suboption.
+                  TokenPtr exist(new TokenVendor(ctx.getUniverse(), $3, TokenOption::EXISTS, $8));
+                  ctx.expression.push_back(exist);
+               }
+          | MEMBER "(" STRING ")"
+              {
+                  // Expression member('foo')
+                  //
+                  // This token will check if the packet is a member of
+                  // the specified client class.
+                  // To avoid loops at evaluation only already defined and
+                  // built-in classes are allowed.
+                  std::string cc = $3;
+                  if (!ctx.isClientClassDefined(cc)) {
+                      error(@3, "Not defined client class '" + cc + "'");
+                  }
+                  TokenPtr member(new TokenMember(cc));
+                  ctx.expression.push_back(member);
+              }
+          ;
+
+string_expr : STRING
+                  {
+                      TokenPtr str(new TokenString($1));
+                      ctx.expression.push_back(str);
+                  }
+            | HEXSTRING
+                  {
+                      TokenPtr hex(new TokenHexString($1));
+                      ctx.expression.push_back(hex);
+                  }
+            | IP_ADDRESS
+                  {
+                      TokenPtr ip(new TokenIpAddress($1));
+                      ctx.expression.push_back(ip);
+                  }
+            | OPTION "[" option_code "]" "." option_repr_type
+                  {
+                      TokenPtr opt(new TokenOption($3, $6));
+                      ctx.expression.push_back(opt);
+                  }
+            | OPTION "[" option_code "]" "." OPTION "[" sub_option_code "]" "." option_repr_type
+                  {
+                      TokenPtr opt(new TokenSubOption($3, $8, $11));
+                      ctx.expression.push_back(opt);
+                  }
+            | RELAY4 "[" sub_option_code "]" "." option_repr_type
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V4:
+                     {
+                         TokenPtr opt(new TokenRelay4Option($3, $6));
+                         ctx.expression.push_back(opt);
+                         break;
+                     }
+                     case Option::V6:
+                         // We will have relay6[123] for the DHCPv6.
+                         // In a very distant future we'll possibly be able
+                         // to mix both if we have DHCPv4-over-DHCPv6, so it
+                         // has some sense to make it explicit whether we
+                         // talk about DHCPv4 relay or DHCPv6 relay. However,
+                         // for the time being relay4 can be used in DHCPv4
+                         // only.
+                         error(@1, "relay4 can only be used in DHCPv4.");
+                     }
+                  }
+
+            | RELAY6 "[" nest_level "]" "." OPTION "[" sub_option_code "]" "." option_repr_type
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V6:
+                     {
+                         TokenPtr opt(new TokenRelay6Option($3, $8, $11));
+                         ctx.expression.push_back(opt);
+                         break;
+                     }
+                     case Option::V4:
+                         // For now we only use relay6 in DHCPv6.
+                         error(@1, "relay6 can only be used in DHCPv6.");
+                     }
+                  }
+
+            | PKT "." pkt_metadata
+                  {
+                      TokenPtr pkt_metadata(new TokenPkt($3));
+                      ctx.expression.push_back(pkt_metadata);
+                  }
+            | PKT4 "." pkt4_field
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V4:
+                     {
+                         TokenPtr pkt4_field(new TokenPkt4($3));
+                         ctx.expression.push_back(pkt4_field);
+                         break;
+                     }
+                     case Option::V6:
+                         // For now we only use pkt4 in DHCPv4.
+                         error(@1, "pkt4 can only be used in DHCPv4.");
+                     }
+                  }
+            | PKT6 "." pkt6_field
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V6:
+                     {
+                         TokenPtr pkt6_field(new TokenPkt6($3));
+                         ctx.expression.push_back(pkt6_field);
+                         break;
+                     }
+                     case Option::V4:
+                         // For now we only use pkt6 in DHCPv6.
+                         error(@1, "pkt6 can only be used in DHCPv6.");
+                     }
+                  }
+            | RELAY6 "[" nest_level "]" "." relay6_field
+                  {
+                     switch (ctx.getUniverse()) {
+                     case Option::V6:
+                     {
+                         TokenPtr relay6field(new TokenRelay6Field($3, $6));
+                         ctx.expression.push_back(relay6field);
+                         break;
+                     }
+                     case Option::V4:
+                         // For now we only use relay6 in DHCPv6.
+                         error(@1, "relay6 can only be used in DHCPv6.");
+                     }
+                  }
+
+            | SUBSTRING "(" string_expr "," start_expr "," length_expr ")"
+                  {
+                      TokenPtr sub(new TokenSubstring());
+                      ctx.expression.push_back(sub);
+                  }
+            | SPLIT "(" string_expr "," string_expr "," int_expr ")"
+                  {
+                      TokenPtr split(new TokenSplit());
+                      ctx.expression.push_back(split);
+                  }
+            | CONCAT "(" string_expr "," string_expr ")"
+                  {
+                      TokenPtr conc(new TokenConcat());
+                      ctx.expression.push_back(conc);
+                  }
+            | string_expr PLUS string_expr
+                  {
+                      TokenPtr conc(new TokenConcat());
+                      ctx.expression.push_back(conc);
+                  }
+            | IFELSE "(" bool_expr "," string_expr "," string_expr ")"
+                  {
+                      TokenPtr cond(new TokenIfElse());
+                      ctx.expression.push_back(cond);
+                  }
+            | TOHEXSTRING "(" string_expr "," string_expr ")"
+                  {
+                      TokenPtr tohex(new TokenToHexString());
+                      ctx.expression.push_back(tohex);
+                  }
+            | ADDRTOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr addrtotext(new TokenIpAddressToText());
+                      ctx.expression.push_back(addrtotext);
+                  }
+            | INT8TOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr int8totext(new TokenInt8ToText());
+                      ctx.expression.push_back(int8totext);
+                  }
+            | INT16TOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr int16totext(new TokenInt16ToText());
+                      ctx.expression.push_back(int16totext);
+                  }
+            | INT32TOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr int32totext(new TokenInt32ToText());
+                      ctx.expression.push_back(int32totext);
+                  }
+            | UINT8TOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr uint8totext(new TokenUInt8ToText());
+                      ctx.expression.push_back(uint8totext);
+                  }
+            | UINT16TOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr uint16totext(new TokenUInt16ToText());
+                      ctx.expression.push_back(uint16totext);
+                  }
+            | UINT32TOTEXT "(" string_expr ")"
+                  {
+                      TokenPtr uint32totext(new TokenUInt32ToText());
+                      ctx.expression.push_back(uint32totext);
+                  }
+            | VENDOR "." ENTERPRISE
+                {
+                    // expression: vendor.enterprise
+                    //
+                    // This token will return enterprise-id number of
+                    // received vendor option.
+                    TokenPtr vendor(new TokenVendor(ctx.getUniverse(), 0, TokenVendor::ENTERPRISE_ID));
+                    ctx.expression.push_back(vendor);
+                }
+            | VENDOR_CLASS "." ENTERPRISE
+                {
+                    // expression: vendor-class.enterprise
+                    //
+                    // This token will return enterprise-id number of
+                    // received vendor class option.
+                    TokenPtr vendor(new TokenVendorClass(ctx.getUniverse(), 0,
+                                                         TokenVendor::ENTERPRISE_ID));
+                    ctx.expression.push_back(vendor);
+                }
+            | VENDOR "[" enterprise_id "]" "." OPTION "[" sub_option_code "]" "." option_repr_type
+                {
+                    // This token will search for vendor option with
+                    // specified enterprise-id.  If found, will search
+                    // for specified suboption and finally will return
+                    // its content.
+                    TokenPtr opt(new TokenVendor(ctx.getUniverse(), $3, $11, $8));
+                    ctx.expression.push_back(opt);
+                }
+            | VENDOR_CLASS "[" enterprise_id "]" "." DATA
+                {
+                    // expression: vendor-class[1234].data
+                    //
+                    // Vendor class option does not have suboptions,
+                    // but chunks of data (typically 1, but the option
+                    // structure allows multiple of them). If chunk
+                    // offset is not specified, we assume the first (0th)
+                    // is requested.
+                    TokenPtr vendor_class(new TokenVendorClass(ctx.getUniverse(), $3,
+                                                               TokenVendor::DATA, 0));
+                    ctx.expression.push_back(vendor_class);
+                }
+            | VENDOR_CLASS "[" enterprise_id "]" "." DATA "[" INTEGER "]"
+                {
+                    // expression: vendor-class[1234].data[5]
+                    //
+                    // Vendor class option does not have suboptions,
+                    // but chunks of data (typically 1, but the option
+                    // structure allows multiple of them). This syntax
+                    // specifies which data chunk (tuple) we want.
+                    uint8_t index = ctx.convertUint8($8, @8);
+                    TokenPtr vendor_class(new TokenVendorClass(ctx.getUniverse(), $3,
+                                                               TokenVendor::DATA, index));
+                    ctx.expression.push_back(vendor_class);
+                }
+            | integer_expr
+                {
+                    TokenPtr integer(new TokenInteger($1));
+                    ctx.expression.push_back(integer);
+                }
+            | "(" string_expr ")"
+            ;
+
+integer_expr : INTEGER
+                 {
+                     $$ = ctx.convertUint32($1, @1);
+                 }
+             ;
+
+option_code : INTEGER
+                 {
+                     $$ = ctx.convertOptionCode($1, @1);
+                 }
+            | OPTION_NAME
+                 {
+                     $$ = ctx.convertOptionName($1, @1);
+                 }
+            ;
+
+sub_option_code : INTEGER
+                 {
+                     $$ = ctx.convertOptionCode($1, @1);
+                 }
+                ;
+
+option_repr_type : TEXT
+                      {
+                          $$ = TokenOption::TEXTUAL;
+                      }
+                 | HEX
+                      {
+                          $$ = TokenOption::HEXADECIMAL;
+                      }
+                 ;
+
+nest_level : INTEGER
+                 {
+                     $$ = ctx.convertNestLevelNumber($1, @1);
+                 }
+                 // Eventually we may add strings to handle different
+                 // ways of choosing from which relay we want to extract
+                 // an option or field.
+           ;
+
+pkt_metadata : IFACE
+                  {
+                      $$ = TokenPkt::IFACE;
+                  }
+             | SRC
+                  {
+                      $$ = TokenPkt::SRC;
+                  }
+             | DST
+                  {
+                      $$ = TokenPkt::DST;
+                  }
+             | LEN
+                  {
+                      $$ = TokenPkt::LEN;
+                  }
+             ;
+
+enterprise_id : INTEGER
+                   {
+                       $$ = ctx.convertUint32($1, @1);
+                   }
+              | "*"
+                   {
+                       $$ = 0;
+                   }
+              ;
+
+pkt4_field : CHADDR
+                {
+                    $$ = TokenPkt4::CHADDR;
+                }
+           | HLEN
+                {
+                    $$ = TokenPkt4::HLEN;
+                }
+           | HTYPE
+                {
+                    $$ = TokenPkt4::HTYPE;
+                }
+           | CIADDR
+                {
+                    $$ = TokenPkt4::CIADDR;
+                }
+           | GIADDR
+                {
+                    $$ = TokenPkt4::GIADDR;
+                }
+           | YIADDR
+                {
+                    $$ = TokenPkt4::YIADDR;
+                }
+           | SIADDR
+                {
+                    $$ = TokenPkt4::SIADDR;
+                }
+           | MSGTYPE
+                 {
+                    $$ = TokenPkt4::MSGTYPE;
+                 }
+           | TRANSID
+                 {
+                    $$ = TokenPkt4::TRANSID;
+                 }
+           ;
+
+pkt6_field : MSGTYPE
+                 {
+                     $$ = TokenPkt6::MSGTYPE;
+                 }
+           | TRANSID
+                 {
+                     $$ = TokenPkt6::TRANSID;
+                 }
+           ;
+
+relay6_field : PEERADDR
+                   {
+                       $$ = TokenRelay6Field::PEERADDR;
+                   }
+             | LINKADDR
+                   {
+                       $$ = TokenRelay6Field::LINKADDR;
+                   }
+             ;
+
+start_expr : INTEGER
+                {
+                    TokenPtr str(new TokenString($1));
+                    ctx.expression.push_back(str);
+                }
+           ;
+
+length_expr : INTEGER
+                 {
+                     TokenPtr str(new TokenString($1));
+                     ctx.expression.push_back(str);
+                 }
+            | ALL
+                 {
+                     TokenPtr str(new TokenString("all"));
+                     ctx.expression.push_back(str);
+                 }
+            ;
+int_expr : INTEGER
+                 {
+                     TokenPtr str(new TokenString($1));
+                     ctx.expression.push_back(str);
+                 }
+            ;
+
+%%
+void
+isc::eval::EvalParser::error(const location_type& loc,
+                             const std::string& what)
+{
+    ctx.error(loc, what);
+}
diff --git a/src/lib/eval/tests/Makefile.am b/src/lib/eval/tests/Makefile.am
new file mode 100644
index 0000000..13ba097
--- /dev/null
+++ b/src/lib/eval/tests/Makefile.am
@@ -0,0 +1,46 @@
+SUBDIRS = .
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += -DLOGGING_SPEC_FILE=\"$(abs_top_srcdir)/src/lib/dhcpsrv/logging.spec\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+
+TESTS += libeval_unittests
+
+libeval_unittests_SOURCES  = boolean_unittest.cc
+libeval_unittests_SOURCES += context_unittest.cc
+libeval_unittests_SOURCES += dependency_unittest.cc
+libeval_unittests_SOURCES += evaluate_unittest.cc
+libeval_unittests_SOURCES += token_unittest.cc
+libeval_unittests_SOURCES += run_unittests.cc
+libeval_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+libeval_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+libeval_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
+libeval_unittests_LDADD  = $(top_builddir)/src/lib/eval/libkea-eval.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/testutils/libkea-testutils.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+libeval_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libeval_unittests_LDADD += $(CRYPTO_LIBS) $(LOG4CPLUS_LIBS)
+libeval_unittests_LDADD += $(BOOST_LIBS) $(GTEST_LDADD)
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/eval/tests/Makefile.in b/src/lib/eval/tests/Makefile.in
new file mode 100644
index 0000000..6aa01a2
--- /dev/null
+++ b/src/lib/eval/tests/Makefile.in
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(PROGRAMS)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libeval_unittests-boolean_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-context_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-dependency_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-evaluate_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-token_unittest.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
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+
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+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/libeval_unittests-boolean_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-context_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-dependency_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-evaluate_unittest.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/libeval_unittests-token_unittest.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
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+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/eval/tests/boolean_unittest.cc b/src/lib/eval/tests/boolean_unittest.cc
new file mode 100644
index 0000000..f620dae
--- /dev/null
+++ b/src/lib/eval/tests/boolean_unittest.cc
@@ -0,0 +1,64 @@
+// Copyright (C) 2016-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <eval/eval_context.h>
+#include <eval/evaluate.h>
+#include <eval/token.h>
+#include <dhcp/pkt4.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::dhcp;
+
+namespace {
+
+/// @brief Test fixture for testing booleans.
+class BooleanTest : public ::testing::Test {
+public:
+    void check(const string& expr, bool expected) {
+        EvalContext eval(Option::V4);
+        ASSERT_TRUE(eval.parseString(expr));
+        Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, 12345));
+        if (expected) {
+            EXPECT_TRUE(evaluateBool(eval.expression, *pkt4));
+        } else {
+            EXPECT_FALSE(evaluateBool(eval.expression, *pkt4));
+        }
+    }
+};
+
+// A group of tests
+TEST_F(BooleanTest, tests) {
+    // true and (false or false)
+    check("('a' == 'a') and (('a' == 'b') or ('b' == 'a'))", false);
+    // (true and false) or false
+    check("(('a' == 'a') and ('a' == 'b')) or ('b' == 'a')", false);
+    // not true
+    check("not ('a' == 'a')", false);
+    // not false
+    check("not ('a' == 'b')", true);
+    // true and true and true and false
+    check("('a' == 'a') and ('b' == 'b') and ('c' == 'c') and ('a' == 'c')",
+          false);
+    // false or false or false or true
+    check("('a' == 'b') or ('a' == 'c') or ('b' == 'c') or ('b' == 'b')",
+          true);
+    // true or false or false or false
+    check("('a' == 'a') or ('a' == 'b') or ('a' == 'c') or ('b' == 'c')",
+          true);
+    // not (true or false)
+    check("not (('a' == 'a') or ('a' == 'b'))", false);
+    // not (true and false)
+    check("not (('a' == 'a') and ('a' == 'b'))", true);
+    // (not true) and false
+    check("(not ('a' == 'a')) and ('a' == 'b')",false);
+}
+
+};
diff --git a/src/lib/eval/tests/context_unittest.cc b/src/lib/eval/tests/context_unittest.cc
new file mode 100644
index 0000000..26ef533
--- /dev/null
+++ b/src/lib/eval/tests/context_unittest.cc
@@ -0,0 +1,2118 @@
+// Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <eval/eval_context.h>
+#include <eval/token.h>
+#include <dhcp/option.h>
+#include <dhcp/pkt4.h>
+#include <asiolink/io_address.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::asiolink;
+using namespace isc::dhcp;
+
+namespace {
+
+/// @brief Test class for testing EvalContext aka class test parsing
+class EvalContextTest : public ::testing::Test {
+public:
+    /// @brief constructor to initialize members
+    EvalContextTest() : ::testing::Test(),
+    universe_(Option::V4), parsed_(false)
+    { }
+
+    /// @brief checks if the given token is a string with the expected value
+    void checkTokenString(const TokenPtr& token, const std::string& expected) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenString> str =
+            boost::dynamic_pointer_cast<TokenString>(token);
+        ASSERT_TRUE(str);
+
+        Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, 12345));
+        ValueStack values;
+
+        EXPECT_NO_THROW(token->evaluate(*pkt4, values));
+
+        ASSERT_EQ(1, values.size());
+
+        EXPECT_EQ(expected, values.top());
+    }
+
+    /// @brief checks if the given token is a hex string with the expected value
+    void checkTokenHexString(const TokenPtr& token,
+                             const std::string& expected) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenHexString> hex =
+            boost::dynamic_pointer_cast<TokenHexString>(token);
+        ASSERT_TRUE(hex);
+
+        Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, 12345));
+        ValueStack values;
+
+        EXPECT_NO_THROW(token->evaluate(*pkt4, values));
+
+        ASSERT_EQ(1, values.size());
+
+        EXPECT_EQ(expected, values.top());
+    }
+
+    /// @brief checks if the given token is an IP address with the expected value
+    void checkTokenIpAddress(const TokenPtr& token,
+                             const std::string& expected) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenIpAddress> ipaddr =
+            boost::dynamic_pointer_cast<TokenIpAddress>(token);
+        ASSERT_TRUE(ipaddr);
+
+        Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, 12345));
+        ValueStack values;
+
+        EXPECT_NO_THROW(token->evaluate(*pkt4, values));
+
+        ASSERT_EQ(1, values.size());
+        string value = values.top();
+
+        boost::scoped_ptr<IOAddress> exp_ip;
+        ASSERT_NO_THROW(exp_ip.reset(new IOAddress(expected)));
+        vector<uint8_t> exp_addr = exp_ip->toBytes();
+        ASSERT_EQ(exp_addr.size(), value.size());
+        EXPECT_EQ(0, memcmp(&exp_addr[0], &value[0], value.size()));
+    }
+
+    /// @brief checks if the given token is an equal operator
+    void checkTokenEq(const TokenPtr& token) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenEqual> eq =
+            boost::dynamic_pointer_cast<TokenEqual>(token);
+        EXPECT_TRUE(eq);
+    }
+
+    /// @brief Checks if the given token is integer with expected value
+    ///
+    /// @param token token to be inspected
+    /// @param exp_value expected integer value of the token
+    void checkTokenInteger(const TokenPtr& token, uint32_t exp_value) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenInteger> integer =
+            boost::dynamic_pointer_cast<TokenInteger>(token);
+        ASSERT_TRUE(integer);
+        EXPECT_EQ(exp_value, integer->getInteger());
+    }
+
+    /// @brief checks if the given token is an option with the expected code
+    /// and representation type
+    /// @param token token to be checked
+    /// @param expected_code expected option code
+    /// @param expected_repr expected representation (text, hex, exists)
+    void checkTokenOption(const TokenPtr& token,
+                          uint16_t expected_code,
+                          TokenOption::RepresentationType expected_repr) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenOption> opt =
+            boost::dynamic_pointer_cast<TokenOption>(token);
+        ASSERT_TRUE(opt);
+
+        EXPECT_EQ(expected_code, opt->getCode());
+        EXPECT_EQ(expected_repr, opt->getRepresentation());
+    }
+
+    /// @brief check if the given token is relay4 with the expected code
+    /// and representation type
+    /// @param token token to be checked
+    /// @param expected_code expected option code
+    /// @param expected_repr expected representation (text, hex, exists)
+    void checkTokenRelay4(const TokenPtr& token,
+                          uint16_t expected_code,
+                          TokenOption::RepresentationType expected_repr) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenRelay4Option> relay4 =
+            boost::dynamic_pointer_cast<TokenRelay4Option>(token);
+        EXPECT_TRUE(relay4);
+
+        if (relay4) {
+            EXPECT_EQ(expected_code, relay4->getCode());
+            EXPECT_EQ(expected_repr, relay4->getRepresentation());
+        }
+    }
+
+    /// @brief checks if the given token is a TokenRelay6Option with
+    /// the correct nesting level, option code and representation.
+    /// @param token token to be checked
+    /// @param expected_level expected nesting level
+    /// @param expected_code expected option code
+    /// @param expected_repr expected representation (text, hex, exists)
+    void checkTokenRelay6Option(const TokenPtr& token,
+                                int8_t expected_level,
+                                uint16_t expected_code,
+                                TokenOption::RepresentationType expected_repr) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenRelay6Option> opt =
+            boost::dynamic_pointer_cast<TokenRelay6Option>(token);
+        ASSERT_TRUE(opt);
+
+        EXPECT_EQ(expected_level, opt->getNest());
+        EXPECT_EQ(expected_code, opt->getCode());
+        EXPECT_EQ(expected_repr, opt->getRepresentation());
+    }
+
+    /// @brief This tests attempts to parse the expression then checks
+    /// if the number of tokens is correct and the TokenRelay6Option
+    /// is as expected.
+    ///
+    /// @param expr expression to be parsed
+    /// @param exp_level expected level to be parsed
+    /// @param exp_code expected option code to be parsed
+    /// @param exp_repr expected representation to be parsed
+    /// @param exp_tokens expected number of tokens
+    void testRelay6Option(const std::string& expr,
+                         int8_t exp_level,
+                         uint16_t exp_code,
+                         TokenOption::RepresentationType exp_repr,
+                         int exp_tokens) {
+        EvalContext eval(Option::V6);
+
+        // parse the expression
+        try {
+            parsed_ = eval.parseString(expr);
+        }
+        catch (const EvalParseError& ex) {
+            FAIL() <<"Exception thrown: " << ex.what();
+            return;
+        }
+
+        // Parsing should succeed and return a token.
+        EXPECT_TRUE(parsed_);
+
+        // There should be the expected number of tokens.
+        ASSERT_EQ(exp_tokens, eval.expression.size());
+
+        // checked that the first token is TokenRelay6Option and that
+        // is has the correct attributes
+        checkTokenRelay6Option(eval.expression.at(0), exp_level, exp_code, exp_repr);
+    }
+
+    /// @brief check if the given token is a Pkt of specified type
+    /// @param token token to be checked
+    /// @param type expected type of the Pkt metadata
+    void checkTokenPkt(const TokenPtr& token, TokenPkt::MetadataType type) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenPkt> pkt =
+            boost::dynamic_pointer_cast<TokenPkt>(token);
+        ASSERT_TRUE(pkt);
+
+        EXPECT_EQ(type, pkt->getType());
+    }
+
+    /// @brief Test that verifies access to the DHCP packet metadata.
+    ///
+    /// This test attempts to parse the expression, will check if the number
+    /// of tokens is exactly as expected and then will try to verify if the
+    /// first token represents the expected metadata in DHCP packet.
+    ///
+    /// @param expr expression to be parsed
+    /// @param exp_type expected metadata type to be parsed
+    /// @param exp_tokens expected number of tokens
+    void testPktMetadata(const std::string& expr,
+                         TokenPkt::MetadataType exp_type,
+                         int exp_tokens) {
+        EvalContext eval(Option::V6);
+
+        // Parse the expression.
+        try {
+            parsed_ = eval.parseString(expr);
+        }
+        catch (const EvalParseError& ex) {
+            FAIL() << "Exception thrown: " << ex.what();
+            return;
+        }
+
+        // Parsing should succeed and return a token.
+        EXPECT_TRUE(parsed_);
+
+        // There should be exactly the expected number of tokens.
+        ASSERT_EQ(exp_tokens, eval.expression.size());
+
+        // Check that the first token is TokenPkt instance and has correct type.
+        checkTokenPkt(eval.expression.at(0), exp_type);
+    }
+
+    /// @brief checks if the given token is Pkt4 of specified type
+    /// @param token token to be checked
+    /// @param type expected type of the Pkt4 field
+    void checkTokenPkt4(const TokenPtr& token, TokenPkt4::FieldType type) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenPkt4> pkt =
+            boost::dynamic_pointer_cast<TokenPkt4>(token);
+        ASSERT_TRUE(pkt);
+
+        EXPECT_EQ(type, pkt->getType());
+    }
+
+    /// @brief Test that verifies access to the DHCPv4 packet fields.
+    ///
+    /// This test attempts to parse the expression, will check if the number
+    /// of tokens is exactly as expected and then will try to verify if the
+    /// first token represents the expected field in DHCPv4 packet.
+    ///
+    /// @param expr expression to be parsed
+    /// @param exp_type expected field type to be parsed
+    /// @param exp_tokens expected number of tokens
+    void testPkt4Field(const std::string& expr,
+                       TokenPkt4::FieldType exp_type,
+                       int exp_tokens) {
+        EvalContext eval(Option::V4);
+
+        // Parse the expression.
+        try {
+            parsed_ = eval.parseString(expr);
+        }
+        catch (const EvalParseError& ex) {
+            FAIL() << "Exception thrown: " << ex.what();
+            return;
+        }
+
+        // Parsing should succeed and return a token.
+        EXPECT_TRUE(parsed_);
+
+        // There should be exactly the expected number of tokens.
+        ASSERT_EQ(exp_tokens, eval.expression.size());
+
+        // Check that the first token is TokenPkt4 instance and has correct type.
+        checkTokenPkt4(eval.expression.at(0), exp_type);
+    }
+
+    /// @brief checks if the given token is Pkt6 of specified type
+    /// @param token token to be checked
+    /// @param exp_type expected type of the Pkt6 field
+    void checkTokenPkt6(const TokenPtr& token,
+                        TokenPkt6::FieldType exp_type) {
+        ASSERT_TRUE(token);
+
+        boost::shared_ptr<TokenPkt6> pkt =
+            boost::dynamic_pointer_cast<TokenPkt6>(token);
+
+        ASSERT_TRUE(pkt);
+
+        EXPECT_EQ(exp_type, pkt->getType());
+    }
+
+    /// @brief Test that verifies access to the DHCPv6 packet fields.
+    ///
+    /// This test attempts to parse the expression, will check if the number
+    /// of tokens is exactly as planned and then will try to verify if the
+    /// first token represents expected the field in DHCPv6 packet.
+    ///
+    /// @param expr expression to be parsed
+    /// @param exp_type expected field type to be parsed
+    /// @param exp_tokens expected number of tokens
+    void testPkt6Field(const std::string& expr,
+                       TokenPkt6::FieldType exp_type,
+                       int exp_tokens) {
+        EvalContext eval(Option::V6);
+
+        // Parse the expression.
+        try {
+            parsed_ = eval.parseString(expr);
+        }
+        catch (const EvalParseError& ex) {
+            FAIL() << "Exception thrown: " << ex.what();
+            return;
+        }
+
+        // Parsing should succeed and return a token.
+        EXPECT_TRUE(parsed_);
+
+        // There should be the requested number of tokens
+        ASSERT_EQ(exp_tokens, eval.expression.size());
+
+        // Check that the first token is TokenPkt6 instance and has correct type.
+        checkTokenPkt6(eval.expression.at(0), exp_type);
+    }
+
+    /// @brief checks if the given token is a TokenRelay with the
+    /// correct nesting level and field type.
+    /// @param token token to be checked
+    /// @param expected_level expected nesting level
+    /// @param expected_code expected option code
+    /// @param expected_repr expected representation (text, hex, exists)
+    void checkTokenRelay6Field(const TokenPtr& token,
+                               int8_t expected_level,
+                               TokenRelay6Field::FieldType expected_type) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenRelay6Field> opt =
+            boost::dynamic_pointer_cast<TokenRelay6Field>(token);
+        ASSERT_TRUE(opt);
+
+        EXPECT_EQ(expected_level, opt->getNest());
+        EXPECT_EQ(expected_type, opt->getType());
+    }
+
+    /// @brief This tests attempts to parse the expression then checks
+    /// if the number of tokens is correct and the TokenRelay6Field is as
+    /// expected.
+    ///
+    /// @param expr expression to be parsed
+    /// @param exp_level expected level to be parsed
+    /// @param exp_type expected field type to be parsed
+    /// @param exp_tokens expected number of tokens
+    void testRelay6Field(const std::string& expr,
+                         int8_t exp_level,
+                         TokenRelay6Field::FieldType exp_type,
+                         int exp_tokens) {
+        EvalContext eval(Option::V6);
+
+        // parse the expression
+        try {
+            parsed_ = eval.parseString(expr);
+        }
+        catch (const EvalParseError& ex) {
+            FAIL() <<"Exception thrown: " << ex.what();
+            return;
+        }
+
+        // Parsing should succeed and return a token.
+        EXPECT_TRUE(parsed_);
+
+        // There should be the expected number of tokens.
+        ASSERT_EQ(exp_tokens, eval.expression.size());
+
+        // checked that the first token is TokenRelay6Field and that
+        // is has the correct attributes
+        checkTokenRelay6Field(eval.expression.at(0), exp_level, exp_type);
+    }
+
+    /// @brief checks if the given token is a TokenMember with the
+    /// correct client class name.
+    /// @param token token to be checked
+    /// @param expected_client_class expected client class name
+    void checkTokenMember(const TokenPtr& token,
+                          const std::string& expected_client_class) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenMember> member =
+            boost::dynamic_pointer_cast<TokenMember>(token);
+        ASSERT_TRUE(member);
+
+        EXPECT_EQ(expected_client_class, member->getClientClass());
+    }
+
+    /// @brief This tests attempts to parse the expression then checks
+    /// if the number of tokens is correct and the TokenMember is as
+    /// expected.
+    ///
+    /// @param expr expression to be parsed
+    /// @param check_defined closure checking if the client class is defined
+    /// @param exp_client_class expected client class name to be parsed
+    /// @param exp_tokens expected number of tokens
+    void testMember(const std::string& expr,
+                    EvalContext::CheckDefined check_defined,
+                    const std::string& exp_client_class,
+                    int exp_tokens) {
+        EvalContext eval(Option::V6, check_defined);
+
+        // parse the expression
+        try {
+            parsed_ = eval.parseString(expr);
+        }
+        catch (const EvalParseError& ex) {
+            FAIL() <<"Exception thrown: " << ex.what();
+            return;
+        }
+
+        // Parsing should succeed and return a token.
+        EXPECT_TRUE(parsed_);
+
+        // There should be the expected number of tokens.
+        ASSERT_EQ(exp_tokens, eval.expression.size());
+
+        // checked that the first token is TokenRelay6Field and that
+        // is has the correct attributes
+        checkTokenMember(eval.expression.at(0), exp_client_class);
+    }
+
+    /// @brief checks if the given token is a substring operator
+    void checkTokenSubstring(const TokenPtr& token) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenSubstring> sub =
+            boost::dynamic_pointer_cast<TokenSubstring>(token);
+        EXPECT_TRUE(sub);
+    }
+
+    /// @brief checks if the given token is a concat operator
+    void checkTokenConcat(const TokenPtr& token) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenConcat> conc =
+            boost::dynamic_pointer_cast<TokenConcat>(token);
+        EXPECT_TRUE(conc);
+    }
+
+    /// @brief checks if the given token is an ifelse operator
+    void checkTokenIfElse(const TokenPtr& token) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenIfElse> alt =
+            boost::dynamic_pointer_cast<TokenIfElse>(token);
+        EXPECT_TRUE(alt);
+    }
+
+    /// @brief checks if the given token is a hexstring operator
+    void checkTokenToHexString(const TokenPtr& token) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenToHexString> tohex =
+            boost::dynamic_pointer_cast<TokenToHexString>(token);
+        EXPECT_TRUE(tohex);
+    }
+
+    /// @brief checks if the given token is an addrtotext operator
+    void checkTokenIpAddressToText(const TokenPtr& token,
+                                   const std::string& expected) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenIpAddressToText> addrtotext =
+            boost::dynamic_pointer_cast<TokenIpAddressToText>(token);
+        EXPECT_TRUE(addrtotext);
+
+        Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, 12345));
+        ValueStack values;
+
+        std::vector<uint8_t> bytes = IOAddress(expected).toBytes();
+        values.push(std::string(bytes.begin(), bytes.end()));
+
+        EXPECT_NO_THROW(token->evaluate(*pkt4, values));
+
+        ASSERT_EQ(1, values.size());
+        string value = values.top();
+
+        EXPECT_EQ(value, expected);
+    }
+
+    /// @brief checks if the given token is a inttotext operator
+    template <typename IntegerType, typename TokenIntegerType>
+    void checkTokenIntToText(const TokenPtr& token,
+                             const std::string& expected) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenIntegerType> inttotext =
+            boost::dynamic_pointer_cast<TokenIntegerType>(token);
+        EXPECT_TRUE(inttotext);
+
+        Pkt4Ptr pkt4(new Pkt4(DHCPDISCOVER, 12345));
+        ValueStack values;
+
+        IntegerType n;
+
+        try {
+            if (is_signed<IntegerType>()) {
+                n = static_cast<IntegerType>(boost::lexical_cast<int32_t>(expected));
+            } else {
+                n = static_cast<IntegerType>(boost::lexical_cast<uint32_t>(expected));
+            }
+        } catch (const boost::bad_lexical_cast& e) {
+            FAIL() << "invalid value " << expected << ", error: " << e.what();
+        }
+
+        values.push(std::string(const_cast<const char*>(reinterpret_cast<char*>(&n)), sizeof(IntegerType)));
+
+        EXPECT_NO_THROW(token->evaluate(*pkt4, values));
+
+        ASSERT_EQ(1, values.size());
+        string value = values.top();
+
+        EXPECT_EQ(value, expected);
+    }
+
+    /// @brief checks if the given expression raises the expected message
+    /// when it is parsed.
+    void checkError(const string& expr, const string& msg) {
+        EvalContext eval(universe_);
+        parsed_ = false;
+        try {
+            parsed_ = eval.parseString(expr);
+            FAIL() << "Expected EvalParseError but nothing was raised";
+        }
+        catch (const EvalParseError& ex) {
+            EXPECT_EQ(msg, ex.what());
+            EXPECT_FALSE(parsed_);
+        }
+        catch (...) {
+            FAIL() << "Expected EvalParseError but something else was raised";
+        }
+    }
+
+    /// @brief sets the universe
+    /// @note the default universe is DHCPv4
+    void setUniverse(const Option::Universe& universe) {
+        universe_ = universe;
+    }
+
+    /// @brief Checks if the given token is TokenVendor and has expected characteristics
+    /// @param token token to be checked
+    /// @param exp_vendor_id expected vendor-id (aka enterprise number)
+    /// @param exp_repr expected representation (either 'exists' or 'hex')
+    /// @param exp_option_code expected option code (ignored if 0)
+    void checkTokenVendor(const TokenPtr& token, uint32_t exp_vendor_id,
+                          uint16_t exp_option_code,
+                          TokenOption::RepresentationType exp_repr) {
+        ASSERT_TRUE(token);
+
+        boost::shared_ptr<TokenVendor> vendor =
+            boost::dynamic_pointer_cast<TokenVendor>(token);
+
+        ASSERT_TRUE(vendor);
+
+        EXPECT_EQ(exp_vendor_id, vendor->getVendorId());
+        EXPECT_EQ(exp_repr, vendor->getRepresentation());
+        EXPECT_EQ(exp_option_code, vendor->getCode());
+    }
+
+    /// @brief Tests if specified token vendor expression can be parsed
+    ///
+    /// This test assumes the first token will be token vendor. Any additional
+    /// tokens are ignored. Tests expressions:
+    /// vendor[1234].option[234].hex
+    /// vendor[1234].option[234].exists
+    ///
+    /// @param expr expression to be parsed
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id expected vendor-id (aka enterprise number)
+    /// @param option_code expected option code (ignored if 0)
+    /// @param expected_repr expected representation (either 'exists' or 'hex')
+    void testVendor(const std::string& expr, Option::Universe u,
+                    uint32_t vendor_id, uint16_t option_code,
+                    TokenOption::RepresentationType expected_repr) {
+        EvalContext eval(u);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString(expr));
+        EXPECT_TRUE(parsed_);
+
+        // We need at least one token, we will evaluate the first one.
+        ASSERT_FALSE(eval.expression.empty());
+
+        checkTokenVendor(eval.expression.at(0), vendor_id, option_code, expected_repr);
+    }
+
+    /// @brief Checks if token is really a TokenVendor, that the vendor_id was
+    /// stored properly and that it has expected representation
+    ///
+    /// This test is able to handle expressions similar to:
+    /// vendor[4491].option[1].hex
+    /// vendor[4491].option[1].exists
+    /// vendor[4491].exists
+    /// vendor[*].exists
+    ///
+    /// @param expr expression to be parsed
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id expected vendor-id (aka enterprise number)
+    /// @param expected_repr expected representation (either 'exists' or 'hex')
+    void testVendor(const std::string& expr, Option::Universe u,
+                    uint32_t vendor_id,
+                    TokenOption::RepresentationType expected_repr) {
+        testVendor(expr, u, vendor_id, 0, expected_repr);
+    }
+
+    /// @brief Tests if the expression parses into token vendor that returns enterprise-id
+    ///
+    /// This test is able to handle expressions similar to:
+    /// vendor.enterprise
+    ///
+    /// @param expr expression to be parsed
+    /// @param u universe (V4 or V6)
+    void testVendorEnterprise(const std::string& expr,
+                              Option::Universe u) {
+        EvalContext eval(u);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString(expr));
+        EXPECT_TRUE(parsed_);
+
+        ASSERT_FALSE(eval.expression.empty());
+
+        boost::shared_ptr<TokenVendor> vendor =
+            boost::dynamic_pointer_cast<TokenVendor>(eval.expression.at(0));
+
+        ASSERT_TRUE(vendor);
+        EXPECT_EQ(TokenVendor::ENTERPRISE_ID, vendor->getField());
+    }
+
+    /// @brief This test checks if vendor-class token is correct
+    ///
+    /// This test checks if EXISTS representation is set correctly.
+    /// It covers cases like:
+    /// - vendor-class[4491].exists
+    /// - vendor-class[*].exists
+    ///
+    /// @param expr expression to be parsed
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id expected vendor-id (aka enterprise number)
+    void testVendorClass(const std::string& expr,
+                         Option::Universe u, uint32_t vendor_id) {
+        EvalContext eval(u);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString(expr));
+        EXPECT_TRUE(parsed_);
+
+        ASSERT_EQ(1, eval.expression.size());
+        checkTokenVendorClass(eval.expression.at(0), vendor_id, 0, TokenOption::EXISTS,
+                              TokenVendor::EXISTS);
+    }
+
+    /// @brief Tests if specified token vendor class expression can be parsed
+    ///
+    /// This test assumes the first token will be token vendor-class.
+    /// Any additional tokens are ignored. Tests expressions:
+    /// - vendor-class[4491].exists
+    /// - vendor-class[*].exists
+    /// - vendor-class[4491].data
+    /// - vendor-class[4491].data[3]
+    ///
+    /// @param expr expression to be parsed
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id expected vendor-id (aka enterprise number)
+    /// @param index expected data index
+    void testVendorClass(const std::string& expr, Option::Universe u,
+                         uint32_t vendor_id, uint16_t index) {
+        EvalContext eval(u);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString(expr));
+        EXPECT_TRUE(parsed_);
+
+        // Make sure there's at least one token
+        ASSERT_FALSE(eval.expression.empty());
+
+        // The first token should be TokenVendorClass, let's take a closer look.
+        checkTokenVendorClass(eval.expression.at(0), vendor_id, index,
+                              TokenOption::HEXADECIMAL, TokenVendor::DATA);
+
+    }
+
+    /// @brief Tests if the expression parses into vendor class token that
+    ///        returns enterprise-id.
+    ///
+    /// This test is able to handle expressions similar to:
+    /// - vendor-class.enterprise
+    ///
+    /// @param expr expression to be parsed
+    /// @param u universe (V4 or V6)
+    void testVendorClassEnterprise(const std::string& expr,
+                                   Option::Universe u) {
+        EvalContext eval(u);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString(expr));
+        EXPECT_TRUE(parsed_);
+
+        // Make sure there's at least one token
+        ASSERT_FALSE(eval.expression.empty());
+
+        // The first token should be TokenVendorClass, let's take a closer look.
+        checkTokenVendorClass(eval.expression.at(0), 0, 0, TokenOption::HEXADECIMAL,
+                              TokenVendor::ENTERPRISE_ID);
+    }
+
+    /// @brief Checks if the given token is TokenVendorClass and has expected characteristics
+    ///
+    /// @param token token to be checked
+    /// @param vendor_id expected vendor-id (aka enterprise number)
+    /// @param index expected index (used for data field only)
+    /// @param repr expected representation (either 'exists' or 'hex')
+    /// @param field expected field (none, enterprise or data)
+    void checkTokenVendorClass(const TokenPtr& token, uint32_t vendor_id,
+                               uint16_t index, TokenOption::RepresentationType repr,
+                               TokenVendor::FieldType field) {
+        ASSERT_TRUE(token);
+
+        boost::shared_ptr<TokenVendorClass> vendor =
+            boost::dynamic_pointer_cast<TokenVendorClass>(token);
+
+        ASSERT_TRUE(vendor);
+
+        EXPECT_EQ(vendor_id, vendor->getVendorId());
+        EXPECT_EQ(index, vendor->getDataIndex());
+        EXPECT_EQ(repr, vendor->getRepresentation());
+        EXPECT_EQ(field, vendor->getField());
+    }
+
+    /// @brief checks if the given token is a sub-option with the expected
+    /// parent option and sub-option codes and representation type
+    /// @param token token to be checked
+    /// @param expected_code expected option code
+    /// @param expected_sub_code expected sub-option code
+    /// @param expected_repr expected representation (text, hex, exists)
+    void checkTokenSubOption(const TokenPtr& token,
+                             uint16_t expected_code,
+                             uint16_t expected_sub_code,
+                             TokenOption::RepresentationType expected_repr) {
+        ASSERT_TRUE(token);
+        boost::shared_ptr<TokenSubOption> sub =
+            boost::dynamic_pointer_cast<TokenSubOption>(token);
+        ASSERT_TRUE(sub);
+
+        EXPECT_EQ(expected_code, sub->getCode());
+        EXPECT_EQ(expected_sub_code, sub->getSubCode());
+        EXPECT_EQ(expected_repr, sub->getRepresentation());
+    }
+
+    Option::Universe universe_; ///< Universe (V4 or V6)
+    bool parsed_; ///< Parsing status
+
+};
+
+// Test the error method without location
+TEST_F(EvalContextTest, error) {
+
+    EvalContext eval(Option::V4);
+
+    EXPECT_THROW(eval.error("an error"), EvalParseError);
+}
+
+// Test the fatal method
+TEST_F(EvalContextTest, fatal) {
+
+    EvalContext eval(Option::V4);
+
+    EXPECT_THROW(eval.fatal("a fatal error"), isc::Unexpected);
+}
+
+// Test the convertOptionCode method with an illegal input
+TEST_F(EvalContextTest, badOptionCode) {
+
+    EvalContext eval(Option::V4);
+
+    // the option code must be a number
+    EXPECT_THROW(eval.convertOptionCode("bad", location(position())),
+                 EvalParseError);
+}
+
+// Test the convertNestLevelNumber method with an illegal input
+TEST_F(EvalContextTest, badNestLevelNumber) {
+
+    EvalContext eval(Option::V4);
+
+    // the nest level number must be a number
+    EXPECT_THROW(eval.convertNestLevelNumber("bad", location(position())),
+                 EvalParseError);
+}
+
+// Test the parsing of a basic expression
+TEST_F(EvalContextTest, basic) {
+
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[123].text == 'MSFT'"));
+    EXPECT_TRUE(parsed_);
+}
+
+// Test the parsing of a string terminal
+TEST_F(EvalContextTest, string) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("'foo' == 'bar'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp1  = eval.expression.at(0);
+    TokenPtr tmp2  = eval.expression.at(1);
+
+    checkTokenString(tmp1, "foo");
+    checkTokenString(tmp2, "bar");
+}
+
+// Test the parsing of a basic expression using integers
+TEST_F(EvalContextTest, integer) {
+
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("substring(option[123].text, 0, 2) == '42'"));
+    EXPECT_TRUE(parsed_);
+}
+
+// Test the parsing of a hexstring terminal
+TEST_F(EvalContextTest, hexstring) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("0x666f6f == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenHexString(tmp, "foo");
+}
+
+// Test the parsing of a hexstring terminal with an odd number of
+// hexadecimal digits
+TEST_F(EvalContextTest, oddHexstring) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("0X7 == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenHexString(tmp, "\a");
+}
+
+// Test the parsing of an IPv4 address
+TEST_F(EvalContextTest, ipaddress4) {
+    EvalContext eval(Option::V6);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("10.0.0.1 == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenIpAddress(tmp, "10.0.0.1");
+}
+
+// Test the parsing of an IPv6 address
+TEST_F(EvalContextTest, ipaddress6) {
+    EvalContext eval(Option::V6);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("2001:db8::1 == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenIpAddress(tmp, "2001:db8::1");
+}
+
+// Test the parsing of an IPv4 compatible IPv6 address
+TEST_F(EvalContextTest, ipaddress46) {
+    EvalContext eval(Option::V6);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("::10.0.0.1 == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenIpAddress(tmp, "::10.0.0.1");
+}
+
+// Test the parsing of the unspecified IPv6 address
+TEST_F(EvalContextTest, ipaddress6unspec) {
+    EvalContext eval(Option::V6);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString(":: == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenIpAddress(tmp, "::");
+}
+
+// Test the parsing of an IPv6 prefix
+TEST_F(EvalContextTest, ipaddress6prefix) {
+    EvalContext eval(Option::V6);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("2001:db8:: == 'foo'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+
+    checkTokenIpAddress(tmp, "2001:db8::");
+}
+
+// Test the parsing of an equal expression
+TEST_F(EvalContextTest, equal) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("'foo' == 'bar'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+
+    checkTokenString(tmp1, "foo");
+    checkTokenString(tmp2, "bar");
+    checkTokenEq(tmp3);
+}
+
+// Test the parsing of an option terminal
+TEST_F(EvalContextTest, option) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[123].text == 'foo'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenOption(eval.expression.at(0), 123, TokenOption::TEXTUAL);
+}
+
+// Test parsing of an option identified by name.
+TEST_F(EvalContextTest, optionWithName) {
+    EvalContext eval(Option::V4);
+
+    // Option 'host-name' is a standard DHCPv4 option defined in the libdhcp++.
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[host-name].text == 'foo'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenOption(eval.expression.at(0), 12, TokenOption::TEXTUAL);
+}
+
+// Test parsing of an option existence
+TEST_F(EvalContextTest, optionExists) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[100].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(1, eval.expression.size());
+    checkTokenOption(eval.expression.at(0), 100, TokenOption::EXISTS);
+}
+
+// Test checking that whitespace can surround option name.
+TEST_F(EvalContextTest, optionWithNameAndWhitespace) {
+    EvalContext eval(Option::V4);
+
+    // Option 'host-name' is a standard DHCPv4 option defined in the libdhcp++.
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[  host-name  ].text == 'foo'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenOption(eval.expression.at(0), 12, TokenOption::TEXTUAL);
+}
+
+// Test checking that newlines can surround option name.
+TEST_F(EvalContextTest, optionWithNameAndNewline) {
+    EvalContext eval(Option::V4);
+
+    // Option 'host-name' is a standard DHCPv4 option defined in the libdhcp++.
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("option[\n host-name \n ].text == \n'foo'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenOption(eval.expression.at(0), 12, TokenOption::TEXTUAL);
+}
+
+// Test parsing of an option represented as hexadecimal string.
+TEST_F(EvalContextTest, optionHex) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[123].hex == 0x666F6F"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenOption(eval.expression.at(0), 123, TokenOption::HEXADECIMAL);
+}
+
+// This test checks that the relay4[code].hex can be used in expressions.
+TEST_F(EvalContextTest, relay4Option) {
+
+    EvalContext eval(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+                    eval.parseString("relay4[13].hex == 'thirteen'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+
+    checkTokenRelay4(tmp1, 13, TokenOption::HEXADECIMAL);
+    checkTokenString(tmp2, "thirteen");
+    checkTokenEq(tmp3);
+}
+
+// This test check the relay4[code].exists is supported.
+TEST_F(EvalContextTest, relay4Exists) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("relay4[13].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(1, eval.expression.size());
+    checkTokenRelay4(eval.expression.at(0), 13, TokenOption::EXISTS);
+}
+
+// Verify that relay4[13] is not usable in v6
+// There will be a separate relay accessor for v6.
+TEST_F(EvalContextTest, relay4Error) {
+    universe_ = Option::V6;
+
+    checkError("relay4[13].hex == 'thirteen'",
+               "<string>:1.1-6: relay4 can only be used in DHCPv4.");
+}
+
+// Test the parsing of a relay6 option
+TEST_F(EvalContextTest, relay6Option) {
+    EvalContext eval(Option::V6);
+
+    testRelay6Option("relay6[0].option[123].text == 'foo'",
+                     0, 123, TokenOption::TEXTUAL, 3);
+}
+
+// Test the parsing of existence for a relay6 option
+TEST_F(EvalContextTest, relay6OptionExists) {
+    EvalContext eval(Option::V6);
+
+    testRelay6Option("relay6[1].option[75].exists",
+                     1, 75, TokenOption::EXISTS, 1);
+}
+
+// Test the parsing of hex for a relay6 option
+TEST_F(EvalContextTest, relay6OptionHex) {
+    EvalContext eval(Option::V6);
+
+    testRelay6Option("relay6[2].option[85].hex == 'foo'",
+                     2, 85, TokenOption::HEXADECIMAL, 3);
+}
+
+// Test the parsing of a relay6 option in reverse order
+TEST_F(EvalContextTest, relay6OptionReverse) {
+    EvalContext eval(Option::V6);
+
+    testRelay6Option("relay6[-1].option[123].text == 'foo'",
+                     -1, 123, TokenOption::TEXTUAL, 3);
+}
+
+// Test the nest level of a relay6 option should be in [-32..32[
+TEST_F(EvalContextTest, relay6OptionLimits) {
+    EvalContext eval(Option::V6);
+
+    // max nest level is hop count limit minus one so 31
+    testRelay6Option("relay6[31].option[123].text == 'foo'",
+                     31, 123, TokenOption::TEXTUAL, 3);
+
+    universe_ = Option::V6;
+
+    checkError("relay6[32].option[123].text == 'foo'",
+               "<string>:1.8-9: Nest level has invalid value in 32. "
+               "Allowed range: -32..31");
+
+    // min nest level is minus hop count limit
+    testRelay6Option("relay6[-32].option[123].text == 'foo'",
+                     -32, 123, TokenOption::TEXTUAL, 3);
+
+    checkError("relay6[-33].option[123].text == 'foo'",
+               "<string>:1.8-10: Nest level has invalid value in -33. Allowed range: -32..31");
+}
+
+// Verify that relay6[13].option is not usable in v4
+TEST_F(EvalContextTest, relay6OptionError) {
+    universe_ = Option::V4;
+
+    // nest_level is reduced first so raises the error
+    // (if we'd like to get a relay6 error we have to insert an
+    //  intermediate action to check the universe)
+    checkError("relay6[0].option[123].text == 'foo'",
+               "<string>:1.8: Nest level invalid for DHCPv4 packets");
+}
+
+// Tests whether iface metadata in DHCP can be accessed.
+TEST_F(EvalContextTest, pktMetadataIface) {
+    testPktMetadata("pkt.iface == 'eth0'", TokenPkt::IFACE, 3);
+}
+
+// Tests whether src metadata in DHCP can be accessed.
+TEST_F(EvalContextTest, pktMetadataSrc) {
+    testPktMetadata("pkt.src == fe80::1", TokenPkt::SRC, 3);
+}
+
+// Tests whether dst metadata in DHCP can be accessed.
+TEST_F(EvalContextTest, pktMetadataDst) {
+    testPktMetadata("pkt.dst == fe80::2", TokenPkt::DST, 3);
+}
+
+// Tests whether len metadata in DHCP can be accessed.
+TEST_F(EvalContextTest, pktMetadataLen) {
+    testPktMetadata("pkt.len == 0x00000100", TokenPkt::LEN, 3);
+}
+
+// Tests whether chaddr field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldChaddr) {
+    testPkt4Field("pkt4.mac == 0x000102030405", TokenPkt4::CHADDR, 3);
+}
+
+// Tests whether chaddr field in DHCPv4 can be accessed and converted.
+TEST_F(EvalContextTest, pkt4FieldChaddrHexa) {
+    testPkt4Field("hexstring(pkt4.mac, ':') == '00:01:02:03:04:05'",
+                  TokenPkt4::CHADDR, 5);
+}
+
+// Tests whether hlen field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldHlen) {
+    testPkt4Field("pkt4.hlen == 0x6", TokenPkt4::HLEN, 3);
+}
+
+// Tests whether htype field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldHtype) {
+    testPkt4Field("pkt4.htype == 0x1", TokenPkt4::HTYPE, 3);
+}
+
+// Tests whether ciaddr field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldCiaddr) {
+    testPkt4Field("pkt4.ciaddr == 192.0.2.1", TokenPkt4::CIADDR, 3);
+}
+
+// Tests whether giaddr field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldGiaddr) {
+    testPkt4Field("pkt4.giaddr == 192.0.2.1", TokenPkt4::GIADDR, 3);
+}
+
+// Tests whether yiaddr field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldYiaddr) {
+    testPkt4Field("pkt4.yiaddr == 192.0.2.1", TokenPkt4::YIADDR, 3);
+}
+
+// Tests whether siaddr field in DHCPv4 can be accessed.
+TEST_F(EvalContextTest, pkt4FieldSiaddr) {
+    testPkt4Field("pkt4.siaddr == 192.0.2.1", TokenPkt4::SIADDR, 3);
+}
+
+// Tests whether message type field in DHCPv6 can be accessed.
+TEST_F(EvalContextTest, pkt6FieldMsgtype) {
+    testPkt6Field("pkt6.msgtype == 1", TokenPkt6::MSGTYPE, 3);
+}
+
+// Tests whether transaction id field in DHCPv6 can be accessed.
+TEST_F(EvalContextTest, pkt6FieldTransid) {
+    testPkt6Field("pkt6.transid == 1", TokenPkt6::TRANSID, 3);
+}
+
+// Tests if the linkaddr field in a Relay6 encapsulation can be accessed.
+TEST_F(EvalContextTest, relay6FieldLinkAddr) {
+    testRelay6Field("relay6[0].linkaddr == ::",
+                    0, TokenRelay6Field::LINKADDR, 3);
+}
+
+// Tests if the peeraddr field in a Relay6 encapsulation can be accessed.
+TEST_F(EvalContextTest, relay6FieldPeerAddr) {
+    testRelay6Field("relay6[1].peeraddr == ::",
+                    1, TokenRelay6Field::PEERADDR, 3);
+}
+
+// Verify that relay6[0].<field> is not usable in v4
+TEST_F(EvalContextTest, relay6FieldError) {
+    universe_ = Option::V4;
+
+    // nest_level is reduced first so raises the error
+    // (if we'd like to get a relay6 error we have to insert an
+    //  intermediate action to check the universe)
+    checkError("relay6[0].linkaddr == ::",
+               "<string>:1.8: Nest level invalid for DHCPv4 packets");
+}
+
+// Tests parsing of member with defined class
+TEST_F(EvalContextTest, member) {
+    auto check_defined = [](const ClientClass& cc) { return (cc == "foo"); };
+    testMember("member('foo')", check_defined, "foo", 1);
+}
+
+// Test parsing of member with not defined class
+TEST_F(EvalContextTest, memberError) {
+    auto check_defined = [](const ClientClass& cc) { return (cc == "foo"); };
+    EvalContext eval(Option::V6, check_defined);
+    parsed_ = false;
+    try {
+        parsed_ = eval.parseString("member('bar')");
+        FAIL() << "Expected EvalParseError but nothing was raised";
+    }
+    catch (const EvalParseError& ex) {
+        EXPECT_EQ("<string>:1.8-12: Not defined client class 'bar'",
+                  std::string(ex.what()));
+        EXPECT_FALSE(parsed_);
+    }
+    catch (...) {
+        FAIL() << "Expected EvalParseError but something else was raised";
+    }
+}
+
+// Test parsing of logical operators
+TEST_F(EvalContextTest, logicalOps) {
+    // option.exists
+    EvalContext eval0(Option::V4);
+    EXPECT_NO_THROW(parsed_ = eval0.parseString("option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(1, eval0.expression.size());
+    TokenPtr token = eval0.expression.at(0);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenOption> opt =
+        boost::dynamic_pointer_cast<TokenOption>(token);
+    EXPECT_TRUE(opt);
+
+    // not
+    EvalContext evaln(Option::V4);
+    EXPECT_NO_THROW(parsed_ = evaln.parseString("not option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(2, evaln.expression.size());
+    token = evaln.expression.at(1);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenNot> tnot =
+        boost::dynamic_pointer_cast<TokenNot>(token);
+    EXPECT_TRUE(tnot);
+
+    // and
+    EvalContext evala(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+        evala.parseString("option[123].exists and option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, evala.expression.size());
+    token = evala.expression.at(2);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenAnd> tand =
+        boost::dynamic_pointer_cast<TokenAnd>(token);
+    EXPECT_TRUE(tand);
+
+    // or
+    EvalContext evalo(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+        evalo.parseString("option[123].exists or option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, evalo.expression.size());
+    token = evalo.expression.at(2);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenOr> tor =
+        boost::dynamic_pointer_cast<TokenOr>(token);
+    EXPECT_TRUE(tor);
+}
+
+// Test parsing of logical operators with precedence
+TEST_F(EvalContextTest, logicalPrecedence) {
+    // not precedence > and precedence
+    EvalContext evalna(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+        evalna.parseString("not option[123].exists and option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(4, evalna.expression.size());
+    TokenPtr token = evalna.expression.at(3);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenAnd> tand =
+        boost::dynamic_pointer_cast<TokenAnd>(token);
+    EXPECT_TRUE(tand);
+
+    // and precedence > or precedence
+    EvalContext evaloa(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+        evaloa.parseString("option[123].exists or option[123].exists "
+                         "and option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(5, evaloa.expression.size());
+    token = evaloa.expression.at(4);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenOr> tor =
+        boost::dynamic_pointer_cast<TokenOr>(token);
+    EXPECT_TRUE(tor);
+}
+
+// Test parsing of logical operators with parentheses (same than
+// with precedence but using parentheses to overwrite precedence)
+TEST_F(EvalContextTest, logicalParentheses) {
+    // not precedence > and precedence
+    EvalContext evalna(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+        evalna.parseString("not (option[123].exists and option[123].exists)"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(4, evalna.expression.size());
+    TokenPtr token = evalna.expression.at(3);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenNot> tnot =
+        boost::dynamic_pointer_cast<TokenNot>(token);
+    EXPECT_TRUE(tnot);
+
+    // and precedence > or precedence
+    EvalContext evaloa(Option::V4);
+    EXPECT_NO_THROW(parsed_ =
+        evaloa.parseString("(option[123].exists or option[123].exists) "
+                         "and option[123].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(5, evaloa.expression.size());
+    token = evaloa.expression.at(4);
+    ASSERT_TRUE(token);
+    boost::shared_ptr<TokenAnd> tand =
+        boost::dynamic_pointer_cast<TokenAnd>(token);
+    EXPECT_TRUE(tand);
+}
+
+// Test the parsing of a substring expression
+TEST_F(EvalContextTest, substring) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("substring('foobar',2,all) == 'obar'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(6, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenString(tmp1, "foobar");
+    checkTokenString(tmp2, "2");
+    checkTokenString(tmp3, "all");
+    checkTokenSubstring(tmp4);
+}
+
+// Test the parsing of a concat expression
+TEST_F(EvalContextTest, concat) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("concat('foo','bar') == 'foobar'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(5, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+
+    checkTokenString(tmp1, "foo");
+    checkTokenString(tmp2, "bar");
+    checkTokenConcat(tmp3);
+}
+
+// Test the parsing of a plus expression
+TEST_F(EvalContextTest, plus) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("'foo' + 'bar' == 'foobar'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(5, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+
+    checkTokenString(tmp1, "foo");
+    checkTokenString(tmp2, "bar");
+    checkTokenConcat(tmp3);
+}
+
+// Test the parsing of plus expressions
+TEST_F(EvalContextTest, assocPlus) {
+    EvalContext eval(Option::V4);
+
+    // Operator '+' is (left) associative
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("'a' + 'b' + 'c' == 'abc'"));
+
+    ASSERT_EQ(7, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+    TokenPtr tmp5 = eval.expression.at(4);
+
+    checkTokenString(tmp1, "a");
+    checkTokenString(tmp2, "b");
+    checkTokenConcat(tmp3);
+    checkTokenString(tmp4, "c");
+    checkTokenConcat(tmp5);
+}
+
+// Test the parsing of plus expressions with enforced associativity
+TEST_F(EvalContextTest, assocRightPlus) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("'a' + ('b' + 'c') == 'abc'"));
+
+    ASSERT_EQ(7, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+    TokenPtr tmp5 = eval.expression.at(4);
+
+    checkTokenString(tmp1, "a");
+    checkTokenString(tmp2, "b");
+    checkTokenString(tmp3, "c");
+    checkTokenConcat(tmp4);
+    checkTokenConcat(tmp5);
+}
+
+// Test the parsing of an ifelse expression
+TEST_F(EvalContextTest, ifElse) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("ifelse('foo' == 'bar', 'us', 'them') == 'you'"));
+
+    ASSERT_EQ(8, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(2);
+    TokenPtr tmp2 = eval.expression.at(3);
+    TokenPtr tmp3 = eval.expression.at(4);
+    TokenPtr tmp4 = eval.expression.at(5);
+
+    checkTokenEq(tmp1);
+    checkTokenString(tmp2, "us");
+    checkTokenString(tmp3, "them");
+    checkTokenIfElse(tmp4);
+}
+
+// Test the parsing of a plus operator and ifelse expression
+TEST_F(EvalContextTest, plusIfElse) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("'foo' + ifelse('a' == 'a', 'bar', '') == 'foobar'"));
+
+    ASSERT_EQ(10, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+    TokenPtr tmp5 = eval.expression.at(4);
+    TokenPtr tmp6 = eval.expression.at(5);
+    TokenPtr tmp7 = eval.expression.at(6);
+    TokenPtr tmp8 = eval.expression.at(7);
+
+    checkTokenString(tmp1, "foo");
+    checkTokenString(tmp2, "a");
+    checkTokenString(tmp3, "a");
+    checkTokenEq(tmp4);
+    checkTokenString(tmp5, "bar");
+    checkTokenString(tmp6, "");
+    checkTokenIfElse(tmp7);
+    checkTokenConcat(tmp8);
+}
+
+// Test the parsing of a hexstring expression
+TEST_F(EvalContextTest, toHexString) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ =
+        eval.parseString("hexstring(0x666f,'-') == '66-6f'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(5, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+
+    checkTokenHexString(tmp1, "fo");
+    checkTokenString(tmp2, "-");
+    checkTokenToHexString(tmp3);
+}
+
+// Test the parsing of an addrtotext expression
+TEST_F(EvalContextTest, addressToText) {
+    {
+        EvalContext eval(Option::V4);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString("addrtotext(10.0.0.1) == '10.0.0.1'"));
+        EXPECT_TRUE(parsed_);
+
+        ASSERT_EQ(4, eval.expression.size());
+
+        TokenPtr tmp1 = eval.expression.at(0);
+        TokenPtr tmp2 = eval.expression.at(1);
+        TokenPtr tmp3 = eval.expression.at(2);
+        TokenPtr tmp4 = eval.expression.at(3);
+
+        checkTokenIpAddress(tmp1, "10.0.0.1");
+        checkTokenIpAddressToText(tmp2, "10.0.0.1");
+        checkTokenString(tmp3, "10.0.0.1");
+        checkTokenEq(tmp4);
+    }
+
+    {
+        EvalContext eval(Option::V4);
+
+        EXPECT_NO_THROW(parsed_ = eval.parseString("addrtotext(2001:db8::1) == '2001:db8::1'"));
+        EXPECT_TRUE(parsed_);
+
+        ASSERT_EQ(4, eval.expression.size());
+
+        TokenPtr tmp1 = eval.expression.at(0);
+        TokenPtr tmp2 = eval.expression.at(1);
+        TokenPtr tmp3 = eval.expression.at(2);
+        TokenPtr tmp4 = eval.expression.at(3);
+
+        checkTokenIpAddress(tmp1, "2001:db8::1");
+        checkTokenIpAddressToText(tmp2, "2001:db8::1");
+        checkTokenString(tmp3, "2001:db8::1");
+        checkTokenEq(tmp4);
+    }
+}
+
+// Test the parsing of a int8_t expression
+TEST_F(EvalContextTest, int8ToText) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("int8totext(255) == '-1'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(4, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenInteger(tmp1, 255);
+    checkTokenIntToText<int8_t, TokenInt8ToText>(tmp2, "-1");
+    checkTokenString(tmp3, "-1");
+    checkTokenEq(tmp4);
+}
+
+// Test the parsing of a int16_t expression
+TEST_F(EvalContextTest, int16ToText) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("int16totext(65535) == '-1'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(4, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenInteger(tmp1, 65535);
+    checkTokenIntToText<int16_t, TokenInt16ToText>(tmp2, "-1");
+    checkTokenString(tmp3, "-1");
+    checkTokenEq(tmp4);
+}
+
+// Test the parsing of a int32_t expression
+TEST_F(EvalContextTest, int32ToText) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("int32totext(4294967295) == '-1'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(4, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenInteger(tmp1, 4294967295);
+    checkTokenIntToText<int32_t, TokenInt32ToText>(tmp2, "-1");
+    checkTokenString(tmp3, "-1");
+    checkTokenEq(tmp4);
+}
+
+// Test the parsing of a uint8_t expression
+TEST_F(EvalContextTest, uint8ToText) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("uint8totext(255) == '255'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(4, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenInteger(tmp1, 255);
+    checkTokenIntToText<uint8_t, TokenUInt8ToText>(tmp2, "255");
+    checkTokenString(tmp3, "255");
+    checkTokenEq(tmp4);
+}
+
+// Test the parsing of a uint16_t expression
+TEST_F(EvalContextTest, uint16ToText) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("uint16totext(65535) == '65535'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(4, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenInteger(tmp1, 65535);
+    checkTokenIntToText<uint16_t, TokenUInt16ToText>(tmp2, "65535");
+    checkTokenString(tmp3, "65535");
+    checkTokenEq(tmp4);
+}
+
+// Test the parsing of a uint32_t expression
+TEST_F(EvalContextTest, uint32ToText) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("uint32totext(4294967295) == '4294967295'"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(4, eval.expression.size());
+
+    TokenPtr tmp1 = eval.expression.at(0);
+    TokenPtr tmp2 = eval.expression.at(1);
+    TokenPtr tmp3 = eval.expression.at(2);
+    TokenPtr tmp4 = eval.expression.at(3);
+
+    checkTokenInteger(tmp1, 4294967295);
+    checkTokenIntToText<uint32_t, TokenUInt32ToText>(tmp2, "4294967295");
+    checkTokenString(tmp3, "4294967295");
+    checkTokenEq(tmp4);
+}
+
+//
+// Test some scanner error cases
+TEST_F(EvalContextTest, scanErrors) {
+    checkError("'", "<string>:1.1: Invalid character: '");
+    checkError("'\''", "<string>:1.3: Invalid character: '");
+    checkError("'\n'", "<string>:1.1: Invalid character: '");
+    checkError("0x123h", "<string>:1.6: Invalid character: h");
+    checkError(":1", "<string>:1.1: Invalid character: :");
+    checkError("=", "<string>:1.1: Invalid character: =");
+
+    // Typo should be handled as well.
+    checkError("subtring", "<string>:1.1: Invalid character: s");
+    checkError("foo", "<string>:1.1: Invalid character: f");
+    checkError(" bar", "<string>:1.2: Invalid character: b");
+    checkError("relay[12].hex == 'foo'", "<string>:1.1: Invalid character: r");
+    checkError("pkt4.ziaddr", "<string>:1.6: Invalid character: z");
+    checkError("members('foo'", "<string>:1.7: Invalid character: s");
+}
+
+// Tests some scanner/parser error cases
+TEST_F(EvalContextTest, scanParseErrors) {
+    checkError("", "<string>:1.1: syntax error, unexpected end of file");
+    checkError(" ", "<string>:1.2: syntax error, unexpected end of file");
+    checkError("0x", "<string>:1.2: Invalid character: x");
+    checkError("0abc",
+               "<string>:1.2: Invalid character: a");
+
+    // This one is a little bid odd. This is a truncated address, so it's not
+    // recognized as an address. Instead, the first token (10) is recognized as
+    // an integer. The only thing we can do with integers right now is to
+    // apply equality or concat operators, so the only possible next token
+    // are == and +. There's a dot instead, so an error is reported.
+    checkError("10.0.1", "<string>:1.3: syntax error, unexpected ., "
+               "expecting == or +");
+
+    checkError("10.256.0.1",
+               "<string>:1.1-10: Failed to convert 10.256.0.1 to "
+               "an IP address.");
+    checkError(":::",
+               "<string>:1.1-3: Failed to convert ::: to an IP address.");
+    checkError("===", "<string>:1.1-2: syntax error, unexpected ==");
+    checkError("option[-1].text",
+               "<string>:1.8-9: Option code has invalid "
+               "value in -1. Allowed range: 0..255");
+    checkError("option[256].text",
+               "<string>:1.8-10: Option code has invalid "
+               "value in 256. Allowed range: 0..255");
+    setUniverse(Option::V6);
+    checkError("option[65536].text",
+               "<string>:1.8-12: Option code has invalid "
+               "value in 65536. Allowed range: 0..65535");
+    setUniverse(Option::V4);
+    checkError("option[12345678901234567890].text",
+               "<string>:1.8-27: Failed to convert 12345678901234567890 "
+               "to an integer.");
+    checkError("option[123]",
+               "<string>:1.12: syntax error, unexpected end of file,"
+               " expecting .");
+    checkError("option[123].text < 'foo'", "<string>:1.18: Invalid"
+               " character: <");
+    checkError("option[-ab].text", "<string>:1.8: Invalid character: -");
+    checkError("option[0ab].text",
+               "<string>:1.9-10: syntax error, unexpected option name, "
+               "expecting ]");
+    checkError("option[ab_].hex", "<string>:1.8: Invalid character: a");
+    checkError("option[\nhost-name\n].hex =\n= 'foo'",
+               "<string>:3.7: Invalid character: =");
+    checkError("substring('foo',12345678901234567890,1)",
+               "<string>:1.17-36: Failed to convert 12345678901234567890 "
+               "to an integer.");
+}
+
+// Tests some parser error cases
+TEST_F(EvalContextTest, parseErrors) {
+    checkError("'foo''bar'",
+               "<string>:1.6-10: syntax error, unexpected constant string, "
+               "expecting == or +");
+    checkError("'foo' (",
+               "<string>:1.7: syntax error, unexpected (, expecting == or +");
+    checkError("== 'ab'", "<string>:1.1-2: syntax error, unexpected ==");
+    checkError("'foo' ==",
+               "<string>:1.9: syntax error, unexpected end of file");
+    checkError("('foo' == 'bar'",
+               "<string>:1.16: syntax error, unexpected end of file, "
+               "expecting ) or and or or");
+    checkError("('foo' == 'bar') ''",
+               "<string>:1.18-19: syntax error, unexpected constant string, "
+               "expecting end of file");
+    checkError("not",
+               "<string>:1.4: syntax error, unexpected end of file");
+    checkError("not 'foo'",
+               "<string>:1.10: syntax error, unexpected end of file, "
+               "expecting == or +");
+    checkError("not()",
+               "<string>:1.5: syntax error, unexpected )");
+    checkError("(not('foo' 'bar')",
+               "<string>:1.12-16: syntax error, unexpected constant string, "
+               "expecting ) or == or +");
+    checkError("and",
+               "<string>:1.1-3: syntax error, unexpected and");
+    checkError("'foo' and",
+               "<string>:1.7-9: syntax error, unexpected and, "
+               "expecting == or +");
+    checkError("'foo' == 'bar' and",
+               "<string>:1.19: syntax error, unexpected end of file");
+    checkError("'foo' == 'bar' and ''",
+               "<string>:1.22: syntax error, unexpected end of file, "
+               "expecting == or +");
+    checkError("or",
+               "<string>:1.1-2: syntax error, unexpected or");
+    checkError("'foo' or",
+               "<string>:1.7-8: syntax error, unexpected or, "
+               "expecting == or +");
+    checkError("'foo' == 'bar' or",
+               "<string>:1.18: syntax error, unexpected end of file");
+    checkError("'foo' == 'bar' or ''",
+               "<string>:1.21: syntax error, unexpected end of file, "
+               "expecting == or +");
+    checkError("option 'ab'",
+               "<string>:1.8-11: syntax error, unexpected "
+               "constant string, expecting [");
+    checkError("option(10) == 'ab'",
+               "<string>:1.7: syntax error, "
+               "unexpected (, expecting [");
+    checkError("option['ab'].text == 'foo'",
+               "<string>:1.8-11: syntax error, "
+               "unexpected constant string, "
+               "expecting integer or option name");
+    checkError("option[ab].text == 'foo'",
+               "<string>:1.8-9: option 'ab' is not defined");
+    checkError("option[0xa].text == 'ab'",
+               "<string>:1.8-10: syntax error, "
+               "unexpected constant hexstring, "
+               "expecting integer or option name");
+    checkError("option[10].bin", "<string>:1.12: Invalid character: b");
+    checkError("option[boot-size].bin", "<string>:1.19: Invalid character: b");
+    checkError("option[10].exists == 'foo'",
+               "<string>:1.19-20: syntax error, unexpected ==, "
+               "expecting end of file");
+    checkError("substring('foobar') == 'f'",
+               "<string>:1.19: syntax error, unexpected ), "
+               "expecting \",\" or +");
+    checkError("substring('foobar',3) == 'bar'",
+               "<string>:1.21: syntax error, unexpected ), expecting \",\"");
+    checkError("substring('foobar','3',3) == 'bar'",
+               "<string>:1.20-22: syntax error, unexpected constant string, "
+               "expecting integer");
+    checkError("substring('foobar',1,a) == 'foo'",
+               "<string>:1.22: Invalid character: a");
+    string long_text = "substring('foobar',1,65535) == ";
+    for (int i = 0; i < (1 << 16); ++i) {
+        long_text += "0";
+    }
+    long_text += "'";
+    checkError(long_text,
+               "<string>:1.65568: Invalid character: '");
+    checkError("concat('foobar') == 'f'",
+               "<string>:1.16: syntax error, unexpected ), "
+               "expecting \",\" or +");
+    checkError("concat('foo','bar','') == 'foobar'",
+               "<string>:1.19: syntax error, unexpected \",\", "
+               "expecting ) or +");
+    checkError("ifelse('foo'=='bar','foo')",
+               "<string>:1.26: syntax error, unexpected ), "
+               "expecting \",\" or +");
+    checkError("ifelse('foo'=='bar','foo','bar','')",
+               "<string>:1.32: syntax error, unexpected \",\", "
+               "expecting ) or +");
+    checkError("+ 'a' = 'a'", "<string>:1.1: syntax error, unexpected +");
+    checkError("'a' + == 'a'", "<string>:1.7-8: syntax error, unexpected ==");
+    checkError("'a' ++ 'b' == 'ab'",
+               "<string>:1.6: syntax error, unexpected +");
+    checkError("addrtotext(10.0.0.1, 10.0.0.2)",
+               "<string>:1.20: syntax error, unexpected \",\", expecting ) or +");
+    checkError("addrtotext('cafebabecafebabe')",
+               "<string>:1.31: syntax error, unexpected end of file, expecting == or +");
+    checkError("addrtotext('')",
+               "<string>:1.15: syntax error, unexpected end of file, expecting == or +");
+    checkError("int8totext('01', '01')",
+               "<string>:1.16: syntax error, unexpected \",\", expecting ) or +");
+    checkError("int8totext('0123')",
+               "<string>:1.19: syntax error, unexpected end of file, expecting == or +");
+    checkError("int8totext('')",
+               "<string>:1.15: syntax error, unexpected end of file, expecting == or +");
+    checkError("int16totext('0123', '0123')",
+               "<string>:1.19: syntax error, unexpected \",\", expecting ) or +");
+    checkError("int16totext('01')",
+               "<string>:1.18: syntax error, unexpected end of file, expecting == or +");
+    checkError("int16totext('')",
+               "<string>:1.16: syntax error, unexpected end of file, expecting == or +");
+    checkError("int32totext('01234567', '01234567')",
+               "<string>:1.23: syntax error, unexpected \",\", expecting ) or +");
+    checkError("int32totext('01')",
+               "<string>:1.18: syntax error, unexpected end of file, expecting == or +");
+    checkError("int32totext('')",
+               "<string>:1.16: syntax error, unexpected end of file, expecting == or +");
+    checkError("uint8totext('01', '01')",
+               "<string>:1.17: syntax error, unexpected \",\", expecting ) or +");
+    checkError("uint8totext('0123')",
+               "<string>:1.20: syntax error, unexpected end of file, expecting == or +");
+    checkError("uint8totext('')",
+               "<string>:1.16: syntax error, unexpected end of file, expecting == or +");
+    checkError("uint16totext('0123', '0123')",
+               "<string>:1.20: syntax error, unexpected \",\", expecting ) or +");
+    checkError("uint16totext('01')",
+               "<string>:1.19: syntax error, unexpected end of file, expecting == or +");
+    checkError("uint16totext('')",
+               "<string>:1.17: syntax error, unexpected end of file, expecting == or +");
+    checkError("uint32totext('01234567', '01234567')",
+               "<string>:1.24: syntax error, unexpected \",\", expecting ) or +");
+    checkError("uint32totext('01')",
+               "<string>:1.19: syntax error, unexpected end of file, expecting == or +");
+    checkError("uint32totext('')",
+               "<string>:1.17: syntax error, unexpected end of file, expecting == or +");
+}
+
+// Tests some type error cases
+TEST_F(EvalContextTest, typeErrors) {
+    checkError("'foobar'",
+               "<string>:1.9: syntax error, unexpected end of file, "
+               "expecting == or +");
+    checkError("substring('foobar',all,1) == 'foo'",
+               "<string>:1.20-22: syntax error, unexpected all, "
+               "expecting integer");
+    checkError("substring('foobar',0x32,1) == 'foo'",
+               "<string>:1.20-23: syntax error, unexpected constant "
+               "hexstring, expecting integer");
+
+    // With the #4483 addition, all integers are treated as 4 byte strings,
+    // so those checks no longer makes sense. Commenting it out.
+    // checkError("concat('foo',3) == 'foo3'",
+    //            "<string>:1.14: syntax error, unexpected integer");
+    // checkError("concat(3,'foo') == '3foo'",
+    //           "<string>:1.8: syntax error, unexpected integer");
+    checkError("('foo' == 'bar') == 'false'",
+               "<string>:1.18-19: syntax error, unexpected ==, "
+               "expecting end of file");
+    checkError("not 'true'",
+               "<string>:1.11: syntax error, unexpected end of file, "
+               "expecting == or +");
+    checkError("'true' and 'false'",
+               "<string>:1.8-10: syntax error, unexpected and, "
+               "expecting == or +");
+    checkError("'true' or 'false'",
+               "<string>:1.8-9: syntax error, unexpected or, "
+               "expecting == or +");
+
+    // Ifelse requires a boolean condition and string branches.
+    checkError("ifelse('foobar','foo','bar')",
+               "<string>:1.16: syntax error, unexpected \",\", "
+               "expecting == or +");
+    checkError("ifelse('foo'=='bar','foo'=='foo','bar')",
+               "<string>:1.26-27: syntax error, unexpected ==, "
+               "expecting \",\" or +");
+    checkError("ifelse('foo'=='bar','foo','bar'=='bar')",
+               "<string>:1.32-33: syntax error, unexpected ==, "
+               "expecting ) or +");
+
+    // Member uses quotes around the client class name.
+    checkError("member(foo)", "<string>:1.8: Invalid character: f");
+
+    // sub-option by name is not supported.
+    checkError("option[123].option[host-name].exists",
+               "<string>:1.20-28: syntax error, unexpected option name, "
+               "expecting integer");
+
+    // Addrtotext requires string storing the binary representation of the address.
+    checkError("addrtotext('192.100.1.1')",
+               "<string>:1.26: syntax error, unexpected end of file, expecting == or +");
+
+    // Int8totext requires string storing the binary representation of the 8 bit integer.
+    checkError("int8totext('0123')",
+               "<string>:1.19: syntax error, unexpected end of file, expecting == or +");
+
+    // Int16totext requires string storing the binary representation of the 16 bit integer.
+    checkError("int16totext('01')",
+               "<string>:1.18: syntax error, unexpected end of file, expecting == or +");
+
+    // Int32totext requires string storing the binary representation of the 32 bit integer.
+    checkError("int32totext('01')",
+               "<string>:1.18: syntax error, unexpected end of file, expecting == or +");
+
+    // Uint8totext requires string storing the binary representation of the 8 bit unsigned integer.
+    checkError("uint8totext('0123')",
+               "<string>:1.20: syntax error, unexpected end of file, expecting == or +");
+
+    // Uint16totext requires string storing the binary representation of the 16 bit unsigned integer.
+    checkError("uint16totext('01')",
+               "<string>:1.19: syntax error, unexpected end of file, expecting == or +");
+
+    // Uint32totext requires string storing the binary representation of the 32 bit unsigned integer.
+    checkError("uint32totext('01')",
+               "<string>:1.19: syntax error, unexpected end of file, expecting == or +");
+}
+
+TEST_F(EvalContextTest, vendor4SpecificVendorExists) {
+    testVendor("vendor[4491].exists", Option::V4, 4491, TokenOption::EXISTS);
+}
+
+TEST_F(EvalContextTest, vendor6SpecificVendorExists) {
+    testVendor("vendor[4491].exists", Option::V6, 4491, TokenOption::EXISTS);
+}
+
+TEST_F(EvalContextTest, vendor4AnyVendorExists) {
+    testVendor("vendor[*].exists", Option::V4, 0, TokenOption::EXISTS);
+}
+
+TEST_F(EvalContextTest, vendor6AnyVendorExists) {
+    testVendor("vendor[*].exists", Option::V6, 0, TokenOption::EXISTS);
+}
+
+TEST_F(EvalContextTest, vendor4enterprise) {
+    testVendorEnterprise("vendor.enterprise == 0x1234", Option::V4);
+}
+
+TEST_F(EvalContextTest, vendor6enterprise) {
+    testVendorEnterprise("vendor.enterprise == 0x1234", Option::V6);
+}
+
+TEST_F(EvalContextTest, vendor4SuboptionExists) {
+    testVendor("vendor[4491].option[1].exists", Option::V4, 4491, 1, TokenOption::EXISTS);
+}
+
+TEST_F(EvalContextTest, vendor6SuboptionExists) {
+    testVendor("vendor[4491].option[1].exists", Option::V6, 4491, 1, TokenOption::EXISTS);
+}
+
+TEST_F(EvalContextTest, vendor4SuboptionHex) {
+    testVendor("vendor[4491].option[1].hex == 0x1234", Option::V4, 4491, 1,
+               TokenOption::HEXADECIMAL);
+}
+
+TEST_F(EvalContextTest, vendor6SuboptionHex) {
+    testVendor("vendor[4491].option[1].hex == 0x1234", Option::V6, 4491, 1,
+               TokenOption::HEXADECIMAL);
+}
+
+TEST_F(EvalContextTest, vendorClass4SpecificVendorExists) {
+    testVendorClass("vendor-class[4491].exists", Option::V4, 4491);
+}
+
+TEST_F(EvalContextTest, vendorClass6SpecificVendorExists) {
+    testVendorClass("vendor-class[4491].exists", Option::V6, 4491);
+}
+
+TEST_F(EvalContextTest, vendorClass4AnyVendorExists) {
+    testVendorClass("vendor-class[*].exists", Option::V4, 0);
+}
+
+TEST_F(EvalContextTest, vendorClass6AnyVendorExists) {
+    testVendorClass("vendor-class[*].exists", Option::V6, 0);
+}
+
+TEST_F(EvalContextTest, vendorClass4enterprise) {
+    testVendorClassEnterprise("vendor-class.enterprise == 0x1234", Option::V4);
+}
+
+TEST_F(EvalContextTest, vendorClass6enterprise) {
+    testVendorClassEnterprise("vendor-class.enterprise == 0x1234", Option::V6);
+}
+
+TEST_F(EvalContextTest, vendorClass4SpecificVendorData) {
+    testVendorClass("vendor-class[4491].data == 0x1234", Option::V4, 4491, 0);
+}
+
+TEST_F(EvalContextTest, vendorClass6SpecificVendorData) {
+    testVendorClass("vendor-class[4491].data == 0x1234", Option::V6, 4491, 0);
+}
+
+TEST_F(EvalContextTest, vendorClass4AnyVendorData) {
+    testVendorClass("vendor-class[*].data == 0x1234", Option::V4, 0, 0);
+}
+
+TEST_F(EvalContextTest, vendorClass6AnyVendorData) {
+    testVendorClass("vendor-class[*].data == 0x1234", Option::V6, 0, 0);
+}
+
+TEST_F(EvalContextTest, vendorClass4DataIndex) {
+    testVendorClass("vendor-class[4491].data[3] == 0x1234", Option::V4, 4491, 3);
+}
+
+TEST_F(EvalContextTest, vendorClass6DataIndex) {
+    testVendorClass("vendor-class[4491].data[3] == 0x1234", Option::V6, 4491, 3);
+}
+
+// Test the parsing of a sub-option with parent by code.
+TEST_F(EvalContextTest, subOptionWithCode) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[123].option[234].text == 'foo'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenSubOption(eval.expression.at(0), 123, 234, TokenOption::TEXTUAL);
+}
+
+// Test the parsing of a sub-option with parent by name.
+TEST_F(EvalContextTest, subOptionWithName) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[host-name].option[123].text == 'foo'"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenSubOption(eval.expression.at(0), 12, 123, TokenOption::TEXTUAL);
+}
+
+// Test the parsing of a sub-option existence
+TEST_F(EvalContextTest, subOptionExists) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[100].option[200].exists"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(1, eval.expression.size());
+    checkTokenSubOption(eval.expression.at(0), 100, 200, TokenOption::EXISTS);
+}
+
+// Test parsing of a sub-option represented as hexadecimal string.
+TEST_F(EvalContextTest, subOptionHex) {
+    EvalContext eval(Option::V4);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("option[123].option[234].hex == 0x666F6F"));
+    EXPECT_TRUE(parsed_);
+    ASSERT_EQ(3, eval.expression.size());
+    checkTokenSubOption(eval.expression.at(0), 123, 234, TokenOption::HEXADECIMAL);
+}
+
+// Checks if integer expressions can be parsed and checked for equality.
+TEST_F(EvalContextTest, integer1) {
+
+    EvalContext eval(Option::V6);
+
+    EXPECT_NO_THROW(parsed_ = eval.parseString("1 == 2"));
+    EXPECT_TRUE(parsed_);
+
+    ASSERT_EQ(3, eval.expression.size());
+
+    TokenPtr tmp = eval.expression.at(0);
+    ASSERT_TRUE(tmp);
+    checkTokenInteger(tmp, 1);
+    tmp = eval.expression.at(1);
+
+    ASSERT_TRUE(tmp);
+    checkTokenInteger(tmp, 2);
+}
+
+}
diff --git a/src/lib/eval/tests/dependency_unittest.cc b/src/lib/eval/tests/dependency_unittest.cc
new file mode 100644
index 0000000..19f9121
--- /dev/null
+++ b/src/lib/eval/tests/dependency_unittest.cc
@@ -0,0 +1,103 @@
+// Copyright (C) 2018,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <eval/dependency.h>
+#include <eval/eval_context.h>
+#include <eval/token.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option_string.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::dhcp;
+
+namespace {
+
+/// @brief Test fixture for testing dependency.
+///
+/// This class provides several convenience objects to be used during testing
+/// of the dependency of classification expressions.
+class DependencyTest : public ::testing::Test {
+public:
+    /// @brief Constructor
+    DependencyTest() : result_(true) {
+    }
+
+    /// @brief Destructor
+    ///
+    /// Reset expression and result.
+    ~DependencyTest() {
+        e_.reset();
+        result_ = false;
+    }
+
+    ExpressionPtr e_; ///< An expression
+
+    bool result_; ///< A decision
+};
+
+// This checks the null expression: it should return false.
+TEST_F(DependencyTest, nullExpr) {
+    TokenPtr token;
+    ASSERT_NO_THROW(result_ = dependOnClass(token, "foobar"));
+    EXPECT_FALSE(result_);
+    ASSERT_NO_THROW(result_ = dependOnClass(e_, "foobar"));
+    EXPECT_FALSE(result_);
+}
+
+// This checks the empty expression: it should return false.
+TEST_F(DependencyTest, emptyExpr) {
+    e_.reset(new Expression());
+    ASSERT_NO_THROW(result_ = dependOnClass(e_, "foobar"));
+    EXPECT_FALSE(result_);
+}
+
+// This checks the { "true" } expression: it should return false.
+TEST_F(DependencyTest, trueExpr) {
+    TokenPtr ttrue;
+    ASSERT_NO_THROW(ttrue.reset(new TokenString("true")));
+    ASSERT_NO_THROW(result_ = dependOnClass(ttrue, "foobar"));
+    EXPECT_FALSE(result_);
+    e_.reset(new Expression());
+    e_->push_back(ttrue);
+    ASSERT_NO_THROW(result_ = dependOnClass(e_, "foobar"));
+    EXPECT_FALSE(result_);
+}
+
+// This checks the { member('not-matching') } expression:
+// it should return false.
+TEST_F(DependencyTest, notMatching) {
+    TokenPtr notmatching;
+    ASSERT_NO_THROW(notmatching.reset(new TokenMember("not-matching")));
+    ASSERT_NO_THROW(result_ = dependOnClass(notmatching, "foobar"));
+    EXPECT_FALSE(result_);
+    e_.reset(new Expression());
+    e_->push_back(notmatching);
+    ASSERT_NO_THROW(result_ = dependOnClass(e_, "foobar"));
+    EXPECT_FALSE(result_);
+}
+
+// This checks the { member('foobar') } expression: it should return true.
+TEST_F(DependencyTest, matching) {
+    TokenPtr matching;
+    ASSERT_NO_THROW(matching.reset(new TokenMember("foobar")));
+    ASSERT_NO_THROW(result_ = dependOnClass(matching, "foobar"));
+    EXPECT_TRUE(result_);
+    e_.reset(new Expression());
+    e_->push_back(matching);
+    result_ = false;
+    ASSERT_NO_THROW(result_ = dependOnClass(e_, "foobar"));
+    EXPECT_TRUE(result_);
+}
+
+};
diff --git a/src/lib/eval/tests/evaluate_unittest.cc b/src/lib/eval/tests/evaluate_unittest.cc
new file mode 100644
index 0000000..37c4f83
--- /dev/null
+++ b/src/lib/eval/tests/evaluate_unittest.cc
@@ -0,0 +1,515 @@
+// Copyright (C) 2015-2018,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <eval/evaluate.h>
+#include <eval/eval_context.h>
+#include <eval/token.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option_string.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::dhcp;
+
+namespace {
+
+/// @brief Test fixture for testing evaluation.
+///
+/// This class provides several convenience objects to be used during testing
+/// of the evaluation of classification expressions.
+class EvaluateTest : public ::testing::Test {
+public:
+
+    /// @brief Initializes Pkt4,Pkt6 and options that can be useful for
+    ///        evaluation tests.
+    EvaluateTest() {
+        e_.clear();
+
+        result_ = false;
+
+        pkt4_.reset(new Pkt4(DHCPDISCOVER, 12345));
+        pkt6_.reset(new Pkt6(DHCPV6_SOLICIT, 12345));
+
+        // Add options with easily identifiable strings in them
+        option_str4_.reset(new OptionString(Option::V4, 100, "hundred4"));
+        option_str6_.reset(new OptionString(Option::V6, 100, "hundred6"));
+
+        pkt4_->addOption(option_str4_);
+        pkt6_->addOption(option_str6_);
+    }
+
+    Expression e_; ///< An expression
+
+    bool result_; ///< A decision
+
+    Pkt4Ptr pkt4_; ///< A stub DHCPv4 packet
+    Pkt6Ptr pkt6_; ///< A stub DHCPv6 packet
+
+    OptionPtr option_str4_; ///< A string option for DHCPv4
+    OptionPtr option_str6_; ///< A string option for DHCPv6
+
+    /// @todo: Add more option types here
+};
+
+// This checks the empty expression: it should raise EvalBadStack
+// when evaluated with a Pkt4. (The actual packet is not used)
+TEST_F(EvaluateTest, empty4) {
+    ASSERT_THROW(evaluateBool(e_, *pkt4_), EvalBadStack);
+}
+
+// This checks the empty expression: it should raise EvalBadStack
+// when evaluated with a Pkt6. (The actual packet is not used)
+TEST_F(EvaluateTest, empty6) {
+    ASSERT_THROW(evaluateBool(e_, *pkt6_), EvalBadStack);
+}
+
+// This checks the { "false" } expression: it should return false
+// when evaluated with a Pkt4. (The actual packet is not used)
+TEST_F(EvaluateTest, false4) {
+    TokenPtr tfalse;
+    ASSERT_NO_THROW(tfalse.reset(new TokenString("false")));
+    e_.push_back(tfalse);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_FALSE(result_);
+}
+
+// This checks the { "false" } expression: it should return false
+// when evaluated with a Pkt6. (The actual packet is not used)
+TEST_F(EvaluateTest, false6) {
+    TokenPtr tfalse;
+    ASSERT_NO_THROW(tfalse.reset(new TokenString("false")));
+    e_.push_back(tfalse);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_FALSE(result_);
+}
+
+// This checks the { "true" } expression: it should return true
+// when evaluated with a Pkt4. (The actual packet is not used)
+TEST_F(EvaluateTest, true4) {
+    TokenPtr ttrue;
+    ASSERT_NO_THROW(ttrue.reset(new TokenString("true")));
+    e_.push_back(ttrue);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_TRUE(result_);
+}
+
+// This checks the { "true" } expression: it should return true
+// when evaluated with a Pkt6. (The actual packet is not used)
+TEST_F(EvaluateTest, true6) {
+    TokenPtr ttrue;
+    ASSERT_NO_THROW(ttrue.reset(new TokenString("true")));
+    e_.push_back(ttrue);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_TRUE(result_);
+}
+
+// This checks the evaluation must lead to "false" or "true"
+// with a Pkt4. (The actual packet is not used)
+TEST_F(EvaluateTest, bad4) {
+    TokenPtr bad;
+    ASSERT_NO_THROW(bad.reset(new TokenString("bad")));
+    e_.push_back(bad);
+    ASSERT_THROW(evaluateBool(e_, *pkt4_), EvalTypeError);
+}
+
+// This checks the evaluation must lead to "false" or "true"
+// with a Pkt6. (The actual packet is not used)
+TEST_F(EvaluateTest, bad6) {
+    TokenPtr bad;
+    ASSERT_NO_THROW(bad.reset(new TokenString("bad")));
+    e_.push_back(bad);
+    ASSERT_THROW(evaluateBool(e_, *pkt6_), EvalTypeError);
+}
+
+// This checks the evaluation must leave only one value on the stack
+// with a Pkt4. (The actual packet is not used)
+TEST_F(EvaluateTest, two4) {
+    TokenPtr ttrue;
+    ASSERT_NO_THROW(ttrue.reset(new TokenString("true")));
+    e_.push_back(ttrue);
+    e_.push_back(ttrue);
+    ASSERT_THROW(evaluateBool(e_, *pkt4_), EvalBadStack);
+}
+
+// This checks the evaluation must leave only one value on the stack
+// with a Pkt6. (The actual packet is not used)
+TEST_F(EvaluateTest, two6) {
+    TokenPtr ttrue;
+    ASSERT_NO_THROW(ttrue.reset(new TokenString("true")));
+    e_.push_back(ttrue);
+    e_.push_back(ttrue);
+    ASSERT_THROW(evaluateBool(e_, *pkt6_), EvalBadStack);
+}
+
+// A more complex test evaluated with a Pkt4. (The actual packet is not used)
+TEST_F(EvaluateTest, compare4) {
+    TokenPtr tfoo;
+    TokenPtr tbar;
+    TokenPtr tequal;
+
+    ASSERT_NO_THROW(tfoo.reset(new TokenString("foo")));
+    e_.push_back(tfoo);
+    ASSERT_NO_THROW(tbar.reset(new TokenString("bar")));
+    e_.push_back(tbar);
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+    e_.push_back(tequal);
+
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_FALSE(result_);
+}
+
+// A more complex test evaluated with a Pkt6. (The actual packet is not used)
+TEST_F(EvaluateTest, compare6) {
+    TokenPtr tfoo;
+    TokenPtr tbar;
+    TokenPtr tequal;
+
+    ASSERT_NO_THROW(tfoo.reset(new TokenString("foo")));
+    e_.push_back(tfoo);
+    ASSERT_NO_THROW(tbar.reset(new TokenString("bar")));
+    e_.push_back(tbar);
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+    e_.push_back(tequal);
+
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_FALSE(result_);
+}
+
+// A test using option existence
+TEST_F(EvaluateTest, exists) {
+    TokenPtr toption;
+
+    ASSERT_NO_THROW(toption.reset(new TokenOption(100, TokenOption::EXISTS)));
+    e_.push_back(toption);
+
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_TRUE(result_);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_TRUE(result_);
+}
+
+// A test using option non-existence
+TEST_F(EvaluateTest, dontExists) {
+    TokenPtr toption;
+
+    ASSERT_NO_THROW(toption.reset(new TokenOption(101, TokenOption::EXISTS)));
+    e_.push_back(toption);
+
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_FALSE(result_);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_FALSE(result_);
+}
+
+// A test using packets.
+TEST_F(EvaluateTest, packet) {
+    TokenPtr toption;
+    TokenPtr tstring;
+    TokenPtr tequal;
+
+    ASSERT_NO_THROW(toption.reset(new TokenOption(100, TokenOption::TEXTUAL)));
+    e_.push_back(toption);
+    ASSERT_NO_THROW(tstring.reset(new TokenString("hundred4")));
+    e_.push_back(tstring);
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+    e_.push_back(tequal);
+
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_TRUE(result_);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_FALSE(result_);
+}
+
+// A test which compares option value represented in hexadecimal format.
+TEST_F(EvaluateTest, optionHex) {
+    TokenPtr toption;
+    TokenPtr tstring;
+    TokenPtr tequal;
+
+    ASSERT_NO_THROW(toption.reset(new TokenOption(100, TokenOption::HEXADECIMAL)));
+    e_.push_back(toption);
+    ASSERT_NO_THROW(tstring.reset(new TokenString("hundred4")));
+    e_.push_back(tstring);
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+    e_.push_back(tequal);
+
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_TRUE(result_);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_FALSE(result_);
+}
+
+// A test using substring on an option.
+TEST_F(EvaluateTest, complex) {
+    TokenPtr toption;
+    TokenPtr tstart;
+    TokenPtr tlength;
+    TokenPtr tsubstring;
+    TokenPtr tstring;
+    TokenPtr tequal;
+
+    // Get the option, i.e., "hundred[46]"
+    ASSERT_NO_THROW(toption.reset(new TokenOption(100, TokenOption::TEXTUAL)));
+    e_.push_back(toption);
+
+    // Get substring("hundred[46]", 0, 7), i.e., "hundred"
+    ASSERT_NO_THROW(tstart.reset(new TokenString("0")));
+    e_.push_back(tstart);
+    ASSERT_NO_THROW(tlength.reset(new TokenString("7")));
+    e_.push_back(tlength);
+    ASSERT_NO_THROW(tsubstring.reset(new TokenSubstring()));
+    e_.push_back(tsubstring);
+
+    // Compare with "hundred"
+    ASSERT_NO_THROW(tstring.reset(new TokenString("hundred")));
+    e_.push_back(tstring);
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+    e_.push_back(tequal);
+
+    // Should return true for v4 and v6 packets
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt4_));
+    EXPECT_TRUE(result_);
+    ASSERT_NO_THROW(result_ = evaluateBool(e_, *pkt6_));
+    EXPECT_TRUE(result_);
+}
+
+/// @brief Generic class for parsing expressions and evaluating them.
+///
+/// The main purpose of this class is to provide a generic interface to the
+/// eval library, so everything (expression parsing and then evaluation for
+/// given packets) can be done in one simple call.
+///
+/// These tests may be somewhat redundant to other more specialized tests, but
+/// the idea here is to mass produce tests that are trivial to write.
+class ExpressionsTest : public EvaluateTest {
+public:
+
+    /// @brief Checks if expression can be parsed and evaluated to bool
+    ///
+    /// There are skeleton packets created in pkt4_ and pkt6_. Make sure you
+    /// tweak them as needed before calling this method.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param expr expression to be parsed
+    /// @param exp_result expected result (true or false)
+    void testExpression(const Option::Universe& u, const std::string& expr,
+                        const bool exp_result) {
+
+        EvalContext eval(u);
+        bool result = false;
+        bool parsed = false;
+
+        EXPECT_NO_THROW(parsed = eval.parseString(expr))
+            << " while parsing expression " << expr;
+        EXPECT_TRUE(parsed) << " for expression " << expr;
+
+        switch (u) {
+        case Option::V4:
+            ASSERT_NO_THROW(result = evaluateBool(eval.expression, *pkt4_))
+                << " for expression " << expr;
+            break;
+        case Option::V6:
+            ASSERT_NO_THROW(result = evaluateBool(eval.expression, *pkt6_))
+                << " for expression " << expr;
+            break;
+        }
+
+        EXPECT_EQ(exp_result, result) << " for expression " << expr;
+    }
+
+    /// @brief Checks if expression can be parsed and evaluated to string
+    ///
+    /// There are skeleton packets created in pkt4_ and pkt6_. Make sure you
+    /// tweak them as needed before calling this method.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param expr expression to be parsed
+    /// @param exp_result expected result (string)
+    void testExpressionString(const Option::Universe& u, const std::string& expr,
+                              const std::string& exp_result) {
+
+        EvalContext eval(u);
+        string result;
+        bool parsed = false;
+
+        EXPECT_NO_THROW(parsed = eval.parseString(expr, EvalContext::PARSER_STRING))
+            << " while parsing expression " << expr;
+        EXPECT_TRUE(parsed) << " for expression " << expr;
+
+        switch (u) {
+        case Option::V4:
+            ASSERT_NO_THROW(result = evaluateString(eval.expression, *pkt4_))
+                << " for expression " << expr;
+            break;
+        case Option::V6:
+            ASSERT_NO_THROW(result = evaluateString(eval.expression, *pkt6_))
+                << " for expression " << expr;
+            break;
+        }
+
+        EXPECT_EQ(exp_result, result) << " for expression " << expr;
+    }
+
+    /// @brief Checks that specified expression throws expected exception.
+    ///
+    /// @tparam ex exception type expected to be thrown
+    /// @param expr expression to be evaluated
+    template<typename ex>
+    void testExpressionNegative(const std::string& expr,
+                                const Option::Universe& u = Option::V4,
+                                EvalContext::ParserType type = EvalContext::PARSER_BOOL) {
+        EvalContext eval(u);
+
+        EXPECT_THROW(eval.parseString(expr, type), ex) << "while parsing expression "
+                                                 << expr;
+    }
+};
+
+// This is a quick way to check if certain expressions are valid or not and
+// whether the whole expression makes sense. This particular test checks if
+// integers can be used properly in expressions. There are many places where
+// integers are used. This particular test checks if pkt6.msgtype returns
+// something that can be compared with integers.
+//
+// For basic things we can take advantage of the skeleton packets created in
+// EvaluateTest constructors: The packet type is DISCOVER in DHCPv4 and
+// SOLICIT in DHCPv6. There is one option added with code 100 and content
+// being either "hundred4" or "hundred6" depending on the universe.
+
+// Tests if pkt6.msgtype returns something that can be compared with integers.
+TEST_F(ExpressionsTest, expressionsInteger1) {
+    testExpression(Option::V6, "pkt6.msgtype == 1", true);
+    testExpression(Option::V6, "pkt6.msgtype == 2", false);
+
+    testExpression(Option::V6, "pkt6.msgtype == 0x00000001", true);
+    testExpression(Option::V6, "pkt6.msgtype == 0x00000002", false);
+}
+
+// Tests if pkt6.transid returns something that can be compared with integers.
+TEST_F(ExpressionsTest, expressionsInteger2) {
+    testExpression(Option::V6, "pkt6.transid == 0", false);
+    testExpression(Option::V6, "pkt6.transid == 12345", true);
+    testExpression(Option::V6, "pkt6.transid == 12346", false);
+}
+
+// Tests if pkt4.transid returns something that can be compared with integers.
+TEST_F(ExpressionsTest, expressionsInteger3) {
+    testExpression(Option::V4, "pkt4.transid == 0", false);
+    testExpression(Option::V4, "pkt4.transid == 12345", true);
+    testExpression(Option::V4, "pkt4.transid == 12346", false);
+}
+
+// Tests if integers can be compared with integers.
+TEST_F(ExpressionsTest, expressionsInteger4) {
+    testExpression(Option::V6, "0 == 0", true);
+    testExpression(Option::V6, "2 == 3", false);
+}
+
+// Tests if pkt4.hlen and pkt4.htype return values that can be compared with integers.
+TEST_F(ExpressionsTest, expressionsPkt4Hlen) {
+
+    // By default there's no hardware set up. The default Pkt4 constructor
+    // creates HWAddr(), which has hlen=0 and htype set to HTYPE_ETHER.
+    testExpression(Option::V4, "pkt4.hlen == 0", true);
+    testExpression(Option::V4, "pkt4.htype == 1", true);
+
+    // Ok, let's initialize the hardware address to something plausible.
+    const size_t hwaddr_len = 6;
+    const uint16_t expected_htype = 123;
+    std::vector<uint8_t> hw(hwaddr_len,0);
+    for (int i = 0; i < hwaddr_len; i++) {
+        hw[i] = i + 1;
+    }
+    pkt4_->setHWAddr(expected_htype, hwaddr_len, hw);
+
+    testExpression(Option::V4, "pkt4.hlen == 0", false);
+    testExpression(Option::V4, "pkt4.hlen == 5", false);
+    testExpression(Option::V4, "pkt4.hlen == 6", true);
+    testExpression(Option::V4, "pkt4.hlen == 7", false);
+
+    testExpression(Option::V4, "pkt4.htype == 0", false);
+    testExpression(Option::V4, "pkt4.htype == 122", false);
+    testExpression(Option::V4, "pkt4.htype == 123", true);
+    testExpression(Option::V4, "pkt4.htype == 124", false);
+
+    testExpression(Option::V4, "pkt4.mac == 0x010203040506", true);
+}
+
+// Test if expressions message type can be detected in Pkt4.
+// It also doubles as a check for integer comparison here.
+TEST_F(ExpressionsTest, expressionsPkt4type) {
+
+    // We can inspect the option content directly, but
+    // it requires knowledge of the option type and its format.
+    testExpression(Option::V4, "option[53].hex == 0x0", false);
+    testExpression(Option::V4, "option[53].hex == 0x1", true);
+    testExpression(Option::V4, "option[53].hex == 0x2", false);
+
+    // It's easier to simply use the pkt4.msgtype
+    testExpression(Option::V4, "pkt4.msgtype == 0", false);
+    testExpression(Option::V4, "pkt4.msgtype == 1", true);
+    testExpression(Option::V4, "pkt4.msgtype == 2", false);
+}
+
+// This tests if inappropriate values (negative, too large) are
+// rejected, but extreme values still allowed for uint32_t are ok.
+TEST_F(ExpressionsTest, invalidIntegers) {
+
+    // These are the extreme uint32_t values that still should be accepted.
+    testExpression(Option::V4, "4294967295 == 0", false);
+
+    // Negative integers should be rejected.
+    testExpressionNegative<EvalParseError>("4294967295 == -1");
+
+    // Oops, one too much.
+    testExpressionNegative<EvalParseError>("4294967296 == 0");
+}
+
+// Tests whether expressions can be evaluated to a string.
+TEST_F(ExpressionsTest, evaluateString) {
+
+    // Check that content of the options is returned properly.
+    testExpressionString(Option::V4, "option[100].hex", "hundred4");
+    testExpressionString(Option::V6, "option[100].hex", "hundred6");
+
+    // Check that content of non-existing option returns empty string.
+    testExpressionString(Option::V4, "option[200].hex", "");
+    testExpressionString(Option::V6, "option[200].hex", "");
+
+    testExpressionNegative<EvalParseError>("pkt4.msgtype == 1", Option::V4,
+                                           EvalContext::PARSER_STRING);
+    testExpressionNegative<EvalParseError>("pkt6.msgtype == 1", Option::V6,
+                                           EvalContext::PARSER_STRING);
+
+    // Check that ifelse works as expecting (it was added explicitly for
+    // the string evaluation).
+    testExpressionString(Option::V4,
+                         "ifelse(option[100].exists,'foo','bar')", "foo");
+    testExpressionString(Option::V4,
+                         "ifelse(option[200].exists,'foo','bar')", "bar");
+
+    // Check that ifelse can be chained.
+    testExpressionString(Option::V4,
+                         "ifelse(option[200].exists,option[200].hex,"
+                                 "ifelse(option[100].exists,"
+                                         "option[100].hex,'none?'))",
+                         "hundred4");
+
+    // Check that hexstring works as expecting.
+    testExpressionString(Option::V4, "hexstring(0x1234,':')", "12:34");
+    testExpressionString(Option::V4, "hexstring(0x56789a,'-')", "56-78-9a");
+    testExpressionString(Option::V4, "hexstring(0xbcde,'')", "bcde");
+    testExpressionString(Option::V4, "hexstring(0xf01234,'..')", "f0..12..34");
+}
+
+};
diff --git a/src/lib/eval/tests/run_unittests.cc b/src/lib/eval/tests/run_unittests.cc
new file mode 100644
index 0000000..08f04d1
--- /dev/null
+++ b/src/lib/eval/tests/run_unittests.cc
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/lib/eval/tests/token_unittest.cc b/src/lib/eval/tests/token_unittest.cc
new file mode 100644
index 0000000..bc70927
--- /dev/null
+++ b/src/lib/eval/tests/token_unittest.cc
@@ -0,0 +1,3487 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <fstream>
+#include <eval/token.h>
+#include <eval/eval_context.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option_string.h>
+#include <dhcp/option_vendor.h>
+#include <dhcp/option_vendor_class.h>
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+#include <log/logger_support.h>
+#include <testutils/log_utils.h>
+
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/constants.hpp>
+#include <boost/algorithm/string/split.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <arpa/inet.h>
+
+using namespace std;
+using namespace isc::dhcp;
+using namespace isc::asiolink;
+using namespace isc::log;
+using namespace isc::dhcp::test;
+
+namespace {
+
+/// @brief Test fixture for testing Tokens.
+///
+/// This class provides several convenience objects to be used during testing
+/// of the Token family of classes.
+
+class TokenTest : public LogContentTest {
+public:
+
+    /// @brief Initializes Pkt4, Pkt6 and options that can be useful for
+    ///        evaluation tests.
+    TokenTest() {
+        pkt4_.reset(new Pkt4(DHCPDISCOVER, 12345));
+        pkt6_.reset(new Pkt6(DHCPV6_SOLICIT, 12345));
+
+        // Add options with easily identifiable strings in them
+        option_str4_.reset(new OptionString(Option::V4, 100, "hundred4"));
+        option_str6_.reset(new OptionString(Option::V6, 100, "hundred6"));
+
+        pkt4_->addOption(option_str4_);
+        pkt6_->addOption(option_str6_);
+
+        // Change this to true if you need extra information about logging
+        // checks to be printed.
+        logCheckVerbose(false);
+    }
+
+    /// @brief Inserts RAI option with several suboptions
+    ///
+    /// The structure inserted is:
+    ///  - RAI (option 82)
+    ///      - option 1 (containing string "one")
+    ///      - option 13 (containing string "thirteen")
+    void insertRelay4Option() {
+
+        // RAI (Relay Agent Information) option
+        OptionPtr rai(new Option(Option::V4, DHO_DHCP_AGENT_OPTIONS));
+        OptionPtr sub1(new OptionString(Option::V4, 1, "one"));
+        OptionPtr sub13(new OptionString(Option::V4, 13, "thirteen"));
+
+        rai->addOption(sub1);
+        rai->addOption(sub13);
+        pkt4_->addOption(rai);
+    }
+
+    /// @brief Adds relay encapsulations with some suboptions
+    ///
+    /// This will add 2 relay encapsulations all will have
+    /// msg_type of RELAY_FORW
+    /// Relay 0 (closest to server) will have
+    /// linkaddr = peeraddr = 0, hop-count = 1
+    /// option 100 "hundred.zero", option 101 "hundredone.zero"
+    /// Relay 1 (closest to client) will have
+    /// linkaddr 1::1= peeraddr = 1::2, hop-count = 0
+    /// option 100 "hundred.one", option 102 "hundredtwo.one"
+    void addRelay6Encapsulations() {
+        // First relay
+        Pkt6::RelayInfo relay0;
+        relay0.msg_type_ = DHCPV6_RELAY_FORW;
+        relay0.hop_count_ = 1;
+        relay0.linkaddr_ = isc::asiolink::IOAddress("::");
+        relay0.peeraddr_ = isc::asiolink::IOAddress("::");
+        OptionPtr optRelay01(new OptionString(Option::V6, 100,
+                                              "hundred.zero"));
+        OptionPtr optRelay02(new OptionString(Option::V6, 101,
+                                              "hundredone.zero"));
+
+        relay0.options_.insert(make_pair(optRelay01->getType(), optRelay01));
+        relay0.options_.insert(make_pair(optRelay02->getType(), optRelay02));
+
+        pkt6_->addRelayInfo(relay0);
+        // Second relay
+        Pkt6::RelayInfo relay1;
+        relay1.msg_type_ = DHCPV6_RELAY_FORW;
+        relay1.hop_count_ = 0;
+        relay1.linkaddr_ = isc::asiolink::IOAddress("1::1");
+        relay1.peeraddr_ = isc::asiolink::IOAddress("1::2");
+        OptionPtr optRelay11(new OptionString(Option::V6, 100,
+                                              "hundred.one"));
+        OptionPtr optRelay12(new OptionString(Option::V6, 102,
+                                              "hundredtwo.one"));
+
+        relay1.options_.insert(make_pair(optRelay11->getType(), optRelay11));
+        relay1.options_.insert(make_pair(optRelay12->getType(), optRelay12));
+        pkt6_->addRelayInfo(relay1);
+    }
+
+    /// @brief Verify that the relay6 option evaluations work properly
+    ///
+    /// Given the nesting level and option code extract the option
+    /// and compare it to the expected string.
+    ///
+    /// @param test_level The nesting level
+    /// @param test_code The code of the option to extract
+    /// @param result_addr The expected result of the address as a string
+    void verifyRelay6Option(const int8_t test_level,
+                            const uint16_t test_code,
+                            const TokenOption::RepresentationType& test_rep,
+                            const std::string& result_string) {
+        // Create the token
+        ASSERT_NO_THROW(t_.reset(new TokenRelay6Option(test_level,
+                                                       test_code,
+                                                       test_rep)));
+
+        // We should be able to evaluate it
+        EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+
+        // We should have one value on the stack
+        ASSERT_EQ(1, values_.size());
+
+        // And it should match the expected result
+        // Invalid nesting levels result in a 0 length string
+        EXPECT_EQ(result_string, values_.top());
+
+        // Then we clear the stack
+        clearStack();
+    }
+
+    /// @brief Verify that the relay6 field evaluations work properly
+    ///
+    /// Given the nesting level, the field to extract and the expected
+    /// address create a token and evaluate it then compare the addresses
+    ///
+    /// @param test_level The nesting level
+    /// @param test_field The type of the field to extract
+    /// @param result_addr The expected result of the address as a string
+    void verifyRelay6Eval(const int8_t test_level,
+                          const TokenRelay6Field::FieldType test_field,
+                          const int result_len,
+                          const uint8_t result_addr[]) {
+        // Create the token
+        ASSERT_NO_THROW(t_.reset(new TokenRelay6Field(test_level, test_field)));
+
+        // We should be able to evaluate it
+        EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+
+        // We should have one value on the stack
+        ASSERT_EQ(1, values_.size());
+
+        // And it should match the expected result
+        // Invalid nesting levels result in a 0 length string
+        EXPECT_EQ(result_len, values_.top().size());
+        if (result_len != 0) {
+            EXPECT_EQ(0, memcmp(result_addr, &values_.top()[0], result_len));
+        }
+
+        // Then we clear the stack
+        clearStack();
+    }
+
+    /// @brief Convenience function. Removes token and values stacks.
+    /// @param token specifies if the convenience token should be removed or not
+    void clearStack(bool token = true) {
+        while (!values_.empty()) {
+            values_.pop();
+        }
+        if (token) {
+            t_.reset();
+        }
+    }
+
+    /// @brief Aux. function that stores integer values as 4 byte string.
+    ///
+    /// @param value integer value to be stored
+    /// @return 4 byte long string with encoded value.
+    string encode(uint32_t value) {
+        return EvalContext::fromUint32(value);
+    }
+
+    TokenPtr t_; ///< Just a convenience pointer
+
+    ValueStack values_; ///< evaluated values will be stored here
+
+    Pkt4Ptr pkt4_; ///< A stub DHCPv4 packet
+    Pkt6Ptr pkt6_; ///< A stub DHCPv6 packet
+
+    OptionPtr option_str4_; ///< A string option for DHCPv4
+    OptionPtr option_str6_; ///< A string option for DHCPv6
+
+    OptionVendorPtr vendor_; ///< Vendor option used during tests
+    OptionVendorClassPtr vendor_class_; ///< Vendor class option used during tests
+
+    /// @brief Verify that the substring eval works properly
+    ///
+    /// This function takes the parameters and sets up the value
+    /// stack then executes the eval and checks the results.
+    ///
+    /// @param test_string The string to operate on
+    /// @param test_start The position to start when getting a substring
+    /// @param test_length The length of the substring to get
+    /// @param result_string The expected result of the eval
+    /// @param should_throw The eval will throw
+    void verifySubstringEval(const std::string& test_string,
+                             const std::string& test_start,
+                             const std::string& test_length,
+                             const std::string& result_string,
+                             bool should_throw = false) {
+
+        // create the token
+        ASSERT_NO_THROW(t_.reset(new TokenSubstring()));
+
+        // push values on stack
+        values_.push(test_string);
+        values_.push(test_start);
+        values_.push(test_length);
+
+        // evaluate the token
+        if (should_throw) {
+            EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+            ASSERT_EQ(0, values_.size());
+        } else {
+            EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+            // verify results
+            ASSERT_EQ(1, values_.size());
+            EXPECT_EQ(result_string, values_.top());
+
+            // remove result
+            values_.pop();
+        }
+    }
+
+    /// @brief Verify that the split eval works properly
+    ///
+    /// This function takes the parameters and sets up the value
+    /// stack then executes the eval and checks the results.
+    ///
+    /// @param test_string The string to operate on
+    /// @param test_delimiters The string of delimiter characters to split upon
+    /// @param test_field The field number of the desired field
+    /// @param result_string The expected result of the eval
+    /// @param should_throw The eval will throw
+    void verifySplitEval(const std::string& test_string,
+                         const std::string& test_delimiters,
+                         const std::string& test_field,
+                         const std::string& result_string,
+                         bool should_throw = false) {
+        // create the token
+        ASSERT_NO_THROW(t_.reset(new TokenSplit()));
+
+        // push values on stack
+        values_.push(test_string);
+        values_.push(test_delimiters);
+        values_.push(test_field);
+
+        // evaluate the token
+        if (should_throw) {
+            EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+            ASSERT_EQ(0, values_.size());
+        } else {
+            EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+            // verify results
+            ASSERT_EQ(1, values_.size());
+            EXPECT_EQ(result_string, values_.top());
+
+            // remove result
+            values_.pop();
+        }
+    }
+
+    /// @brief Creates vendor-option with specified value and adds it to packet
+    ///
+    /// This method creates specified vendor option, removes any existing
+    /// vendor options and adds the new one to v4 or v6 packet.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id specifies enterprise-id value.
+    void setVendorOption(Option::Universe u, uint32_t vendor_id) {
+        vendor_.reset(new OptionVendor(u, vendor_id));
+        switch (u) {
+        case Option::V4:
+            pkt4_->delOption(DHO_VIVSO_SUBOPTIONS);
+            pkt4_->addOption(vendor_);
+            break;
+        case Option::V6:
+            pkt6_->delOption(D6O_VENDOR_OPTS);
+            pkt6_->addOption(vendor_);
+            break;
+        }
+    }
+
+    /// @brief Creates vendor-class option with specified values and adds it to packet
+    ///
+    /// This method creates specified vendor-class option, removes any existing
+    /// vendor class options and adds the new one to v4 or v6 packet.
+    /// It also creates data tuples with greek alphabet names.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id specifies enterprise-id value.
+    /// @param tuples_size number of data tuples to create.
+    void setVendorClassOption(Option::Universe u, uint32_t vendor_id,
+                              size_t tuples_size = 0) {
+        // Create the option first.
+        vendor_class_.reset(new OptionVendorClass(u, vendor_id));
+
+        // Now let's add specified number of data tuples
+        OpaqueDataTuple::LengthFieldType len = (u == Option::V4?OpaqueDataTuple::LENGTH_1_BYTE:
+                                                OpaqueDataTuple::LENGTH_2_BYTES);
+        const char* content[] = { "alpha", "beta", "delta", "gamma", "epsilon",
+                                  "zeta", "eta", "theta", "iota", "kappa" };
+        const size_t nb_content = sizeof(content) / sizeof(char*);
+        ASSERT_TRUE(tuples_size < nb_content);
+        for (size_t i = 0; i < tuples_size; ++i) {
+            OpaqueDataTuple tuple(len);
+            tuple.assign(string(content[i]));
+            if (u == Option::V4 && i == 0) {
+                // vendor-class for v4 has a peculiar quirk. The first tuple is being
+                // added, even if there's no data at all.
+                vendor_class_->setTuple(0, tuple);
+            } else {
+                vendor_class_->addTuple(tuple);
+            }
+        }
+
+        switch (u) {
+        case Option::V4:
+            pkt4_->delOption(DHO_VIVCO_SUBOPTIONS);
+            pkt4_->addOption(vendor_class_);
+            break;
+        case Option::V6:
+            pkt6_->delOption(D6O_VENDOR_CLASS);
+            pkt6_->addOption(vendor_class_);
+            break;
+        }
+    }
+
+    /// @brief Auxiliary function that evaluates tokens and checks result
+    ///
+    /// Depending on the universe, either pkt4_ or pkt6_ are supposed to have
+    /// all the necessary values and options set. The result is checked
+    /// on the values_ stack.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param expected_result text representation of the expected outcome
+    void evaluate(Option::Universe u, std::string expected_result) {
+        switch (u) {
+        case Option::V4:
+            EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+            break;
+        case Option::V6:
+            EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+            break;
+        default:
+            ADD_FAILURE() << "Invalid universe specified.";
+        }
+        ASSERT_EQ(1, values_.size());
+        EXPECT_EQ(expected_result, values_.top());
+    }
+
+    /// @brief Tests if vendor token behaves properly.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param token_vendor_id enterprise-id used in the token
+    /// @param option_vendor_id enterprise-id used in option (0 means don't
+    ///        create the option)
+    /// @param expected_result text representation of the expected outcome
+    void testVendorExists(Option::Universe u, uint32_t token_vendor_id,
+                          uint32_t option_vendor_id,
+                          const std::string& expected_result) {
+        // Let's clear any old values, so we can run multiple cases in each test
+        clearStack();
+
+        // Create the token
+        ASSERT_NO_THROW(t_.reset(new TokenVendor(u, token_vendor_id,
+                                                 TokenOption::EXISTS)));
+
+        // If specified option is non-zero, create it.
+        if (option_vendor_id) {
+            setVendorOption(u, option_vendor_id);
+        }
+
+        evaluate(u, expected_result);
+    }
+
+    /// @brief Tests if vendor token properly returns enterprise-id.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param option_vendor_id enterprise-id used in option (0 means don't
+    ///        create the option)
+    /// @param expected_result text representation of the expected outcome
+    void testVendorEnterprise(Option::Universe u, uint32_t option_vendor_id,
+                              const std::string& expected_result) {
+        // Let's clear any old values, so we can run multiple cases in each test
+        clearStack();
+
+        ASSERT_NO_THROW(t_.reset(new TokenVendor(u, 0, TokenVendor::ENTERPRISE_ID)));
+        if (option_vendor_id) {
+            setVendorOption(u, option_vendor_id);
+        }
+
+        evaluate(u, expected_result);
+    }
+
+    /// @brief Tests if vendor class token properly returns enterprise-id.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param option_vendor_id enterprise-id used in option (0 means don't
+    ///        create the option)
+    /// @param expected_result text representation of the expected outcome
+    void testVendorClassEnterprise(Option::Universe u, uint32_t option_vendor_id,
+                                   const std::string& expected_result) {
+        // Let's clear any old values, so we can run multiple cases in each test
+        clearStack();
+
+        ASSERT_NO_THROW(t_.reset(new TokenVendorClass(u, 0, TokenVendor::ENTERPRISE_ID)));
+        if (option_vendor_id) {
+            setVendorClassOption(u, option_vendor_id);
+        }
+
+        evaluate(u, expected_result);
+    }
+
+    /// @brief Tests if vendor class token can report existence properly.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param token_vendor_id enterprise-id used in the token
+    /// @param option_vendor_id enterprise-id used in option (0 means don't
+    ///        create the option)
+    /// @param expected_result text representation of the expected outcome
+    void testVendorClassExists(Option::Universe u, uint32_t token_vendor_id,
+                               uint32_t option_vendor_id,
+                               const std::string& expected_result) {
+        // Let's clear any old values, so we can run multiple cases in each test
+        clearStack();
+
+        ASSERT_NO_THROW(t_.reset(new TokenVendorClass(u, token_vendor_id,
+                                                      TokenOption::EXISTS)));
+
+        if (option_vendor_id) {
+            setVendorClassOption(u, option_vendor_id);
+        }
+
+        evaluate(u, expected_result);
+    }
+
+    /// @brief Tests if vendor token can handle sub-options properly.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param token_vendor_id enterprise-id used in the token
+    /// @param token_option_code option code in the token
+    /// @param option_vendor_id enterprise-id used in option (0 means don't
+    ///        create the option)
+    /// @param option_code sub-option code (0 means don't create suboption)
+    /// @param repr representation (TokenOption::EXISTS or HEXADECIMAL)
+    /// @param expected_result text representation of the expected outcome
+    void testVendorSuboption(Option::Universe u,
+                             uint32_t token_vendor_id, uint16_t token_option_code,
+                             uint32_t option_vendor_id, uint16_t option_code,
+                             TokenOption::RepresentationType repr,
+                             const std::string& expected) {
+        // Let's clear any old values, so we can run multiple cases in each test
+        clearStack();
+
+        ASSERT_NO_THROW(t_.reset(new TokenVendor(u, token_vendor_id, repr,
+                                                 token_option_code)));
+        if (option_vendor_id) {
+            setVendorOption(u, option_vendor_id);
+            if (option_code) {
+                ASSERT_TRUE(vendor_);
+                OptionPtr subopt(new OptionString(u, option_code, "alpha"));
+                vendor_->addOption(subopt);
+            }
+        }
+
+        evaluate(u, expected);
+    }
+
+    /// @brief Tests if vendor class token can handle data chunks properly.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param token_vendor_id enterprise-id used in the token
+    /// @param token_index data index used in the token
+    /// @param option_vendor_id enterprise-id used in option (0 means don't
+    ///        create the option)
+    /// @param data_tuples number of data tuples in the option
+    /// @param expected_result text representation of the expected outcome
+    void testVendorClassData(Option::Universe u,
+                             uint32_t token_vendor_id, uint16_t token_index,
+                             uint32_t option_vendor_id, uint16_t data_tuples,
+                             const std::string& expected) {
+        // Let's clear any old values, so we can run multiple cases in each test
+        clearStack();
+
+        ASSERT_NO_THROW(t_.reset(new TokenVendorClass(u, token_vendor_id,
+                                                      TokenVendor::DATA, token_index)));
+        if (option_vendor_id) {
+            setVendorClassOption(u, option_vendor_id, data_tuples);
+        }
+
+        evaluate(u, expected);
+    }
+
+    /// @brief Tests if TokenInteger evaluates to the proper value
+    ///
+    /// @param expected expected string representation on stack after evaluation
+    /// @param value integer value passed to constructor
+    void testInteger(const std::string& expected, uint32_t value) {
+
+        clearStack();
+
+        ASSERT_NO_THROW(t_.reset(new TokenInteger(value)));
+
+        // The universe (v4 or v6) shouldn't have any impact on this,
+        // but let's check it anyway.
+        evaluate(Option::V4, expected);
+
+        clearStack(false);
+        evaluate(Option::V6, expected);
+
+        clearStack(true);
+    }
+};
+
+// This tests the toBool() conversions
+TEST_F(TokenTest, toBool) {
+
+    ASSERT_NO_THROW(Token::toBool("true"));
+    EXPECT_TRUE(Token::toBool("true"));
+    ASSERT_NO_THROW(Token::toBool("false"));
+    EXPECT_FALSE(Token::toBool("false"));
+
+    // Token::toBool() is case-sensitive
+    EXPECT_THROW(Token::toBool("True"), EvalTypeError);
+    EXPECT_THROW(Token::toBool("TRUE"), EvalTypeError);
+
+    // Proposed aliases
+    EXPECT_THROW(Token::toBool("1"), EvalTypeError);
+    EXPECT_THROW(Token::toBool("0"), EvalTypeError);
+    EXPECT_THROW(Token::toBool(""), EvalTypeError);
+}
+
+// This simple test checks that a TokenString, representing a constant string,
+// can be used in Pkt4 evaluation. (The actual packet is not used)
+TEST_F(TokenTest, string4) {
+
+    // Store constant string "foo" in the TokenString object.
+    ASSERT_NO_THROW(t_.reset(new TokenString("foo")));
+
+    // Make sure that the token can be evaluated without exceptions.
+    ASSERT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("foo", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_STRING Pushing text string 'foo'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This simple test checks that a TokenString, representing a constant string,
+// can be used in Pkt6 evaluation. (The actual packet is not used)
+TEST_F(TokenTest, string6) {
+
+    // Store constant string "foo" in the TokenString object.
+    ASSERT_NO_THROW(t_.reset(new TokenString("foo")));
+
+    // Make sure that the token can be evaluated without exceptions.
+    ASSERT_NO_THROW(t_->evaluate(*pkt6_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("foo", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_STRING Pushing text string 'foo'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This simple test checks that a TokenHexString, representing a constant
+// string coded in hexadecimal, can be used in Pkt4 evaluation.
+// (The actual packet is not used)
+TEST_F(TokenTest, hexstring4) {
+    TokenPtr empty;
+    TokenPtr bad;
+    TokenPtr nodigit;
+    TokenPtr baddigit;
+    TokenPtr bell;
+    TokenPtr foo;
+    TokenPtr cookie;
+
+    // Store constant empty hexstring "" ("") in the TokenHexString object.
+    ASSERT_NO_THROW(empty.reset(new TokenHexString("")));
+    // Store bad encoded hexstring "0abc" ("").
+    ASSERT_NO_THROW(bad.reset(new TokenHexString("0abc")));
+    // Store hexstring with no digits "0x" ("").
+    ASSERT_NO_THROW(nodigit.reset(new TokenHexString("0x")));
+    // Store hexstring with a bad hexdigit "0xxabc" ("").
+    ASSERT_NO_THROW(baddigit.reset(new TokenHexString("0xxabc")));
+    // Store hexstring with an odd number of hexdigits "0x7" ("\a").
+    ASSERT_NO_THROW(bell.reset(new TokenHexString("0x7")));
+    // Store constant hexstring "0x666f6f" ("foo").
+    ASSERT_NO_THROW(foo.reset(new TokenHexString("0x666f6f")));
+    // Store constant hexstring "0x63825363" (DHCP_OPTIONS_COOKIE).
+    ASSERT_NO_THROW(cookie.reset(new TokenHexString("0x63825363")));
+
+    // Make sure that tokens can be evaluated without exceptions,
+    // and verify the debug output
+    ASSERT_NO_THROW(empty->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(bad->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(nodigit->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(baddigit->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(bell->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(foo->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(cookie->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(7, values_.size());
+    uint32_t expected = htonl(DHCP_OPTIONS_COOKIE);
+    EXPECT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(&expected, &values_.top()[0], 4));
+    values_.pop();
+    EXPECT_EQ("foo", values_.top());
+    values_.pop();
+    EXPECT_EQ("\a", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x07");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x666F6F");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x63825363");
+    EXPECT_TRUE(checkFile());
+}
+
+// This simple test checks that a TokenHexString, representing a constant
+// string coded in hexadecimal, can be used in Pkt6 evaluation.
+// (The actual packet is not used)
+TEST_F(TokenTest, hexstring6) {
+    TokenPtr empty;
+    TokenPtr bad;
+    TokenPtr nodigit;
+    TokenPtr baddigit;
+    TokenPtr bell;
+    TokenPtr foo;
+    TokenPtr cookie;
+
+    // Store constant empty hexstring "" ("") in the TokenHexString object.
+    ASSERT_NO_THROW(empty.reset(new TokenHexString("")));
+    // Store bad encoded hexstring "0abc" ("").
+    ASSERT_NO_THROW(bad.reset(new TokenHexString("0abc")));
+    // Store hexstring with no digits "0x" ("").
+    ASSERT_NO_THROW(nodigit.reset(new TokenHexString("0x")));
+    // Store hexstring with a bad hexdigit "0xxabc" ("").
+    ASSERT_NO_THROW(baddigit.reset(new TokenHexString("0xxabc")));
+    // Store hexstring with an odd number of hexdigits "0x7" ("\a").
+    ASSERT_NO_THROW(bell.reset(new TokenHexString("0x7")));
+    // Store constant hexstring "0x666f6f" ("foo").
+    ASSERT_NO_THROW(foo.reset(new TokenHexString("0x666f6f")));
+    // Store constant hexstring "0x63825363" (DHCP_OPTIONS_COOKIE).
+    ASSERT_NO_THROW(cookie.reset(new TokenHexString("0x63825363")));
+
+    // Make sure that tokens can be evaluated without exceptions.
+    ASSERT_NO_THROW(empty->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(bad->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(nodigit->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(baddigit->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(bell->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(foo->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(cookie->evaluate(*pkt6_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(7, values_.size());
+    uint32_t expected = htonl(DHCP_OPTIONS_COOKIE);
+    EXPECT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(&expected, &values_.top()[0], 4));
+    values_.pop();
+    EXPECT_EQ("foo", values_.top());
+    values_.pop();
+    EXPECT_EQ("\a", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x07");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x666F6F");
+    addString("EVAL_DEBUG_HEXSTRING Pushing hex string 0x63825363");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that a TokenIpAddress, representing an IP address as
+// a constant string, can be used in Pkt4/Pkt6 evaluation.
+// (The actual packet is not used)
+TEST_F(TokenTest, ipaddress) {
+    TokenPtr bad4;
+    TokenPtr bad6;
+    TokenPtr ip4;
+    TokenPtr ip6;
+
+    // Bad IP addresses
+    ASSERT_NO_THROW(bad4.reset(new TokenIpAddress("10.0.0.0.1")));
+    ASSERT_NO_THROW(bad6.reset(new TokenIpAddress(":::")));
+
+    // IP addresses
+    ASSERT_NO_THROW(ip4.reset(new TokenIpAddress("10.0.0.1")));
+    ASSERT_NO_THROW(ip6.reset(new TokenIpAddress("2001:db8::1")));
+
+    // Make sure that tokens can be evaluated without exceptions.
+    ASSERT_NO_THROW(ip4->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(ip6->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(bad4->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(bad6->evaluate(*pkt6_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(4, values_.size());
+
+    // Check bad addresses (they pushed '' on the value stack)
+    EXPECT_EQ(0, values_.top().size());
+    values_.pop();
+    EXPECT_EQ(0, values_.top().size());
+    values_.pop();
+
+    // Check IPv6 address
+    uint8_t expected6[] = { 0x20, 1, 0xd, 0xb8, 0, 0, 0, 0,
+                            0, 0, 0, 0, 0, 0, 0, 1 };
+    EXPECT_EQ(16, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected6, &values_.top()[0], 16));
+    values_.pop();
+
+    // Check IPv4 address
+    uint8_t expected4[] = { 10, 0, 0, 1 };
+    EXPECT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected4, &values_.top()[0], 4));
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_IPADDRESS Pushing IPAddress 0x0A000001");
+    addString("EVAL_DEBUG_IPADDRESS Pushing IPAddress "
+              "0x20010DB8000000000000000000000001");
+    addString("EVAL_DEBUG_IPADDRESS Pushing IPAddress 0x");
+    addString("EVAL_DEBUG_IPADDRESS Pushing IPAddress 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that a TokenIpAddressToText, representing an IP address as
+// a string, can be used in Pkt4/Pkt6 evaluation.
+// (The actual packet is not used)
+TEST_F(TokenTest, addressToText) {
+    TokenPtr address((new TokenIpAddressToText()));
+    std::vector<uint8_t> bytes;
+
+    std::string value = "10.0.0.1";
+    values_.push(value);
+
+    // Invalid data size fails.
+    EXPECT_THROW(address->evaluate(*pkt4_, values_), EvalTypeError);
+
+    bytes = IOAddress(value).toBytes();
+    values_.push(std::string(bytes.begin(), bytes.end()));
+
+    EXPECT_NO_THROW(address->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(1, values_.size());
+
+    value = "2001:db8::1";
+    bytes = IOAddress(value).toBytes();
+    values_.push(std::string(bytes.begin(), bytes.end()));
+
+    EXPECT_NO_THROW(address->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(2, values_.size());
+
+    values_.push(std::string());
+    EXPECT_NO_THROW(address->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(3, values_.size());
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check IPv6 address
+    EXPECT_EQ(11, values_.top().size());
+    EXPECT_EQ("2001:db8::1", values_.top());
+    values_.pop();
+
+    // Check IPv4 address
+    EXPECT_EQ(8, values_.top().size());
+    EXPECT_EQ("10.0.0.1", values_.top());
+    values_.pop();
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_IPADDRESSTOTEXT Pushing IPAddress 10.0.0.1");
+    addString("EVAL_DEBUG_IPADDRESSTOTEXT Pushing IPAddress 2001:db8::1");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that a TokenIntToText, representing an integer as a string,
+// can be used in Pkt4/Pkt6 evaluation.
+// (The actual packet is not used)
+TEST_F(TokenTest, integerToText) {
+    TokenPtr int8token((new TokenInt8ToText()));
+    TokenPtr int16token((new TokenInt16ToText()));
+    TokenPtr int32token((new TokenInt32ToText()));
+    TokenPtr uint8token((new TokenUInt8ToText()));
+    TokenPtr uint16token((new TokenUInt16ToText()));
+    TokenPtr uint32token((new TokenUInt32ToText()));
+
+    std::vector<uint8_t> bytes;
+    std::string value = "0123456789";
+
+    // Invalid data size fails.
+    values_.push(value);
+    EXPECT_THROW(int8token->evaluate(*pkt4_, values_), EvalTypeError);
+    values_.push(value);
+    EXPECT_THROW(int16token->evaluate(*pkt4_, values_), EvalTypeError);
+    values_.push(value);
+    EXPECT_THROW(int32token->evaluate(*pkt4_, values_), EvalTypeError);
+    values_.push(value);
+    EXPECT_THROW(uint8token->evaluate(*pkt4_, values_), EvalTypeError);
+    values_.push(value);
+    EXPECT_THROW(uint16token->evaluate(*pkt4_, values_), EvalTypeError);
+    values_.push(value);
+    EXPECT_THROW(uint32token->evaluate(*pkt4_, values_), EvalTypeError);
+
+    uint64_t data = -1;
+
+    values_.push(std::string(const_cast<const char *>(reinterpret_cast<char*>(&data)), sizeof(int8_t)));
+
+    EXPECT_NO_THROW(int8token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(1, values_.size());
+
+    int16_t i16 = 0;
+    memcpy(&i16, &data, sizeof(int16_t));
+    values_.push(std::string(const_cast<const char *>(reinterpret_cast<char*>(&i16)), sizeof(int16_t)));
+
+    EXPECT_NO_THROW(int16token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(2, values_.size());
+
+    int32_t i32 = 0;
+    memcpy(&i32, &data, sizeof(int32_t));
+    values_.push(std::string(const_cast<const char *>(reinterpret_cast<char*>(&i32)), sizeof(int32_t)));
+
+    EXPECT_NO_THROW(int32token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(3, values_.size());
+
+    values_.push(std::string(const_cast<const char *>(reinterpret_cast<char*>(&data)), sizeof(uint8_t)));
+
+    EXPECT_NO_THROW(uint8token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(4, values_.size());
+
+    uint16_t ui16 = 0;
+    memcpy(&ui16, &data, sizeof(uint16_t));
+    values_.push(std::string(const_cast<const char *>(reinterpret_cast<char*>(&ui16)), sizeof(uint16_t)));
+
+    EXPECT_NO_THROW(uint16token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(5, values_.size());
+
+    uint32_t ui32 = 0;
+    memcpy(&ui32, &data, sizeof(uint32_t));
+    values_.push(std::string(const_cast<const char *>(reinterpret_cast<char*>(&ui32)), sizeof(uint32_t)));
+
+    EXPECT_NO_THROW(uint32token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(6, values_.size());
+
+    value = "";
+
+    values_.push(value);
+    EXPECT_NO_THROW(int8token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(7, values_.size());
+
+    values_.push(value);
+    EXPECT_NO_THROW(int16token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(8, values_.size());
+
+    values_.push(value);
+    EXPECT_NO_THROW(int32token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(9, values_.size());
+
+    values_.push(value);
+    EXPECT_NO_THROW(uint8token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(10, values_.size());
+
+    values_.push(value);
+    EXPECT_NO_THROW(uint16token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(11, values_.size());
+
+    values_.push(value);
+    EXPECT_NO_THROW(uint32token->evaluate(*pkt4_, values_));
+
+    // Check that the evaluation put its value on the values stack.
+    ASSERT_EQ(12, values_.size());
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check empty data
+    EXPECT_EQ(0, values_.top().size());
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Check uint32
+    EXPECT_EQ(10, values_.top().size());
+    EXPECT_EQ("4294967295", values_.top());
+    values_.pop();
+
+    // Check uint16
+    EXPECT_EQ(5, values_.top().size());
+    EXPECT_EQ("65535", values_.top());
+    values_.pop();
+
+    // Check uint8
+    EXPECT_EQ(3, values_.top().size());
+    EXPECT_EQ("255", values_.top());
+    values_.pop();
+
+    // Check int32
+    EXPECT_EQ(2, values_.top().size());
+    EXPECT_EQ("-1", values_.top());
+    values_.pop();
+
+    // Check int16
+    EXPECT_EQ(2, values_.top().size());
+    EXPECT_EQ("-1", values_.top());
+    values_.pop();
+
+    // Check int8
+    EXPECT_EQ(2, values_.top().size());
+    EXPECT_EQ("-1", values_.top());
+    values_.pop();
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_INT8TOTEXT Pushing Int8 -1");
+    addString("EVAL_DEBUG_INT16TOTEXT Pushing Int16 -1");
+    addString("EVAL_DEBUG_INT32TOTEXT Pushing Int32 -1");
+    addString("EVAL_DEBUG_UINT8TOTEXT Pushing UInt8 255");
+    addString("EVAL_DEBUG_UINT16TOTEXT Pushing UInt16 65535");
+    addString("EVAL_DEBUG_UINT32TOTEXT Pushing UInt32 4294967295");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an option value is able to extract
+// the option from an IPv4 packet and properly store the option's value.
+TEST_F(TokenTest, optionString4) {
+    TokenPtr found;
+    TokenPtr not_found;
+
+    // The packets we use have option 100 with a string in them.
+    ASSERT_NO_THROW(found.reset(new TokenOption(100, TokenOption::TEXTUAL)));
+    ASSERT_NO_THROW(not_found.reset(new TokenOption(101, TokenOption::TEXTUAL)));
+
+    // This should evaluate to the content of the option 100 (i.e. "hundred4")
+    ASSERT_NO_THROW(found->evaluate(*pkt4_, values_));
+
+    // This should evaluate to "" as there is no option 101.
+    ASSERT_NO_THROW(not_found->evaluate(*pkt4_, values_));
+
+    // There should be 2 values evaluated.
+    ASSERT_EQ(2, values_.size());
+
+    // This is a stack, so the pop order is inversed. We should get the empty
+    // string first.
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Then the content of the option 100.
+    EXPECT_EQ("hundred4", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'hundred4'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing option value is able to extract
+// the option from an IPv4 packet and properly store its value in a
+// hexadecimal format.
+TEST_F(TokenTest, optionHexString4) {
+    TokenPtr found;
+    TokenPtr not_found;
+
+    // The packets we use have option 100 with a string in them.
+    ASSERT_NO_THROW(found.reset(new TokenOption(100, TokenOption::HEXADECIMAL)));
+    ASSERT_NO_THROW(not_found.reset(new TokenOption(101, TokenOption::HEXADECIMAL)));
+
+    // This should evaluate to the content of the option 100 (i.e. "hundred4")
+    ASSERT_NO_THROW(found->evaluate(*pkt4_, values_));
+
+    // This should evaluate to "" as there is no option 101.
+    ASSERT_NO_THROW(not_found->evaluate(*pkt4_, values_));
+
+    // There should be 2 values evaluated.
+    ASSERT_EQ(2, values_.size());
+
+    // This is a stack, so the pop order is inversed. We should get the empty
+    // string first.
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Then the content of the option 100.
+    EXPECT_EQ("hundred4", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 0x68756E6472656434");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an option value is able to check
+// the existence of the option from an IPv4 packet.
+TEST_F(TokenTest, optionExistsString4) {
+    TokenPtr found;
+    TokenPtr not_found;
+
+    // The packets we use have option 100 with a string in them.
+    ASSERT_NO_THROW(found.reset(new TokenOption(100, TokenOption::EXISTS)));
+    ASSERT_NO_THROW(not_found.reset(new TokenOption(101, TokenOption::EXISTS)));
+
+    ASSERT_NO_THROW(found->evaluate(*pkt4_, values_));
+    ASSERT_NO_THROW(not_found->evaluate(*pkt4_, values_));
+
+    // There should be 2 values evaluated.
+    ASSERT_EQ(2, values_.size());
+
+    // This is a stack, so the pop order is inversed.
+    EXPECT_EQ("false", values_.top());
+    values_.pop();
+    EXPECT_EQ("true", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'true'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an option value is able to extract
+// the option from an IPv6 packet and properly store the option's value.
+TEST_F(TokenTest, optionString6) {
+    TokenPtr found;
+    TokenPtr not_found;
+
+    // The packets we use have option 100 with a string in them.
+    ASSERT_NO_THROW(found.reset(new TokenOption(100, TokenOption::TEXTUAL)));
+    ASSERT_NO_THROW(not_found.reset(new TokenOption(101, TokenOption::TEXTUAL)));
+
+    // This should evaluate to the content of the option 100 (i.e. "hundred6")
+    ASSERT_NO_THROW(found->evaluate(*pkt6_, values_));
+
+    // This should evaluate to "" as there is no option 101.
+    ASSERT_NO_THROW(not_found->evaluate(*pkt6_, values_));
+
+    // There should be 2 values evaluated.
+    ASSERT_EQ(2, values_.size());
+
+    // This is a stack, so the pop order is inversed. We should get the empty
+    // string first.
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Then the content of the option 100.
+    EXPECT_EQ("hundred6", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'hundred6'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an option value is able to extract
+// the option from an IPv6 packet and properly store its value in hexadecimal
+// format.
+TEST_F(TokenTest, optionHexString6) {
+    TokenPtr found;
+    TokenPtr not_found;
+
+    // The packets we use have option 100 with a string in them.
+    ASSERT_NO_THROW(found.reset(new TokenOption(100, TokenOption::HEXADECIMAL)));
+    ASSERT_NO_THROW(not_found.reset(new TokenOption(101, TokenOption::HEXADECIMAL)));
+
+    // This should evaluate to the content of the option 100 (i.e. "hundred6")
+    ASSERT_NO_THROW(found->evaluate(*pkt6_, values_));
+
+    // This should evaluate to "" as there is no option 101.
+    ASSERT_NO_THROW(not_found->evaluate(*pkt6_, values_));
+
+    // There should be 2 values evaluated.
+    ASSERT_EQ(2, values_.size());
+
+    // This is a stack, so the pop order is inversed. We should get the empty
+    // string first.
+    EXPECT_EQ("", values_.top());
+    values_.pop();
+
+    // Then the content of the option 100.
+    EXPECT_EQ("hundred6", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 0x68756E6472656436");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an option value is able to check
+// the existence of the option from an IPv6 packet.
+TEST_F(TokenTest, optionExistsString6) {
+    TokenPtr found;
+    TokenPtr not_found;
+
+    // The packets we use have option 100 with a string in them.
+    ASSERT_NO_THROW(found.reset(new TokenOption(100, TokenOption::EXISTS)));
+    ASSERT_NO_THROW(not_found.reset(new TokenOption(101, TokenOption::EXISTS)));
+
+    ASSERT_NO_THROW(found->evaluate(*pkt6_, values_));
+    ASSERT_NO_THROW(not_found->evaluate(*pkt6_, values_));
+
+    // There should be 2 values evaluated.
+    ASSERT_EQ(2, values_.size());
+
+    // This is a stack, so the pop order is inversed.
+    EXPECT_EQ("false", values_.top());
+    values_.pop();
+    EXPECT_EQ("true", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'true'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that the existing relay4 option can be found.
+TEST_F(TokenTest, relay4Option) {
+
+    // Insert relay option with sub-options 1 and 13
+    insertRelay4Option();
+
+    // Creating the token should be safe.
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(13, TokenOption::TEXTUAL)));
+
+    // We should be able to evaluate it.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have one value on the stack
+    ASSERT_EQ(1, values_.size());
+
+    // The option should be found and relay4[13] should evaluate to the
+    // content of that sub-option, i.e. "thirteen"
+    EXPECT_EQ("thirteen", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 13 with value 'thirteen'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that the code properly handles cases when
+// there is a RAI option, but there's no requested sub-option.
+TEST_F(TokenTest, relay4OptionNoSuboption) {
+
+    // Insert relay option with sub-options 1 and 13
+    insertRelay4Option();
+
+    // Creating the token should be safe.
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(15, TokenOption::TEXTUAL)));
+
+    // We should be able to evaluate it.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have one value on the stack
+    ASSERT_EQ(1, values_.size());
+
+    // The option should NOT be found (there is no sub-option 15),
+    // so the expression should evaluate to ""
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 15 with value ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that the code properly handles cases when
+// there's no RAI option at all.
+TEST_F(TokenTest, relay4OptionNoRai) {
+
+    // We didn't call insertRelay4Option(), so there's no RAI option.
+
+    // Creating the token should be safe.
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(13, TokenOption::TEXTUAL)));
+
+    // We should be able to evaluate it.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have one value on the stack
+    ASSERT_EQ(1, values_.size());
+
+    // The option should NOT be found (there is no sub-option 13),
+    // so the expression should evaluate to ""
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 13 with value ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that only the RAI is searched for the requested
+// sub-option.
+TEST_F(TokenTest, relay4RAIOnly) {
+
+    // Insert relay option with sub-options 1 and 13
+    insertRelay4Option();
+
+    // Add options 13 and 70 to the packet.
+    OptionPtr opt13(new OptionString(Option::V4, 13, "THIRTEEN"));
+    OptionPtr opt70(new OptionString(Option::V4, 70, "SEVENTY"));
+    pkt4_->addOption(opt13);
+    pkt4_->addOption(opt70);
+
+    // The situation is as follows:
+    // Packet:
+    //  - option 13 (containing "THIRTEEN")
+    //  - option 82 (rai)
+    //      - option 1 (containing "one")
+    //      - option 13 (containing "thirteen")
+
+    // Let's try to get option 13. It should get the one from RAI
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(13, TokenOption::TEXTUAL)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("thirteen", values_.top());
+
+    // Try to get option 1. It should get the one from RAI
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(1, TokenOption::TEXTUAL)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("one", values_.top());
+
+    // Try to get option 70. It should fail, as there's no such
+    // sub option in RAI.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(70, TokenOption::TEXTUAL)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("", values_.top());
+
+    // Try to check option 1. It should return "true"
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(1, TokenOption::EXISTS)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // Try to check option 70. It should return "false"
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenRelay4Option(70, TokenOption::EXISTS)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 13 with value 'thirteen'");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 'one'");
+    addString("EVAL_DEBUG_OPTION Pushing option 70 with value ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 'true'");
+    addString("EVAL_DEBUG_OPTION Pushing option 70 with value 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if we can properly extract an option
+// from relay encapsulations.  Our packet has two relay
+// encapsulations.  Both include a common option with the
+// original message (option 100) and both include their
+// own option (101 and 102).  We attempt to extract the
+// options and compare them to expected values.  We also
+// try to extract an option from an encapsulation
+// that doesn't exist (level 2), this should result in an empty
+// string.
+TEST_F(TokenTest, relay6Option) {
+    // We start by adding a set of relay encapsulations to the
+    // basic v6 packet.
+    addRelay6Encapsulations();
+
+    // Then we work our way through the set of choices
+    // Level 0 both options it has and the check that
+    // the checking for an option it doesn't have results
+    // in an empty string.
+    verifyRelay6Option(0, 100, TokenOption::TEXTUAL, "hundred.zero");
+    verifyRelay6Option(0, 100, TokenOption::EXISTS, "true");
+    verifyRelay6Option(0, 101, TokenOption::TEXTUAL, "hundredone.zero");
+    verifyRelay6Option(0, 102, TokenOption::TEXTUAL, "");
+    verifyRelay6Option(0, 102, TokenOption::EXISTS, "false");
+
+    // Level 1, again both options it has and the one for level 0
+    verifyRelay6Option(1, 100, TokenOption::TEXTUAL, "hundred.one");
+    verifyRelay6Option(1, 101, TokenOption::TEXTUAL, "");
+    verifyRelay6Option(1, 102, TokenOption::TEXTUAL, "hundredtwo.one");
+
+    // Level 2, no encapsulation so no options
+    verifyRelay6Option(2, 100, TokenOption::TEXTUAL, "");
+
+    // Level -1, the same as level 1
+    verifyRelay6Option(-1, 100, TokenOption::TEXTUAL, "hundred.one");
+    verifyRelay6Option(-1, 101, TokenOption::TEXTUAL, "");
+    verifyRelay6Option(-1, 102, TokenOption::TEXTUAL, "hundredtwo.one");
+
+    // Level -2, the same as level 0
+    verifyRelay6Option(-2, 100, TokenOption::TEXTUAL, "hundred.zero");
+    verifyRelay6Option(-2, 100, TokenOption::EXISTS, "true");
+    verifyRelay6Option(-2, 101, TokenOption::TEXTUAL, "hundredone.zero");
+    verifyRelay6Option(-2, 102, TokenOption::TEXTUAL, "");
+    verifyRelay6Option(-2, 102, TokenOption::EXISTS, "false");
+
+    // Level -3, no encapsulation so no options
+    verifyRelay6Option(-3, 100, TokenOption::TEXTUAL, "");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'hundred.zero'");
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'true'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value 'hundredone.zero'");
+    addString("EVAL_DEBUG_OPTION Pushing option 102 with value ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 102 with value 'false'");
+
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'hundred.one'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 102 with value 'hundredtwo.one'");
+
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value ''");
+
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'hundred.one'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 102 with value 'hundredtwo.one'");
+
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'hundred.zero'");
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value 'true'");
+    addString("EVAL_DEBUG_OPTION Pushing option 101 with value 'hundredone.zero'");
+    addString("EVAL_DEBUG_OPTION Pushing option 102 with value ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 102 with value 'false'");
+
+    addString("EVAL_DEBUG_OPTION Pushing option 100 with value ''");
+
+    EXPECT_TRUE(checkFile());
+}
+
+// Verifies that relay6 option requires DHCPv6
+TEST_F(TokenTest, relay6OptionError) {
+    // Create a relay6 option token
+    ASSERT_NO_THROW(t_.reset(new TokenRelay6Option(0, 13, TokenOption::TEXTUAL)));
+
+    // A DHCPv6 packet is required
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+}
+
+// Verifies that DHCPv4 packet metadata can be extracted.
+TEST_F(TokenTest, pkt4MetaData) {
+    pkt4_->setIface("eth0");
+    pkt4_->setLocalAddr(IOAddress("10.0.0.1"));
+    pkt4_->setRemoteAddr(IOAddress("10.0.0.2"));
+
+    // Check interface (expect eth0)
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::IFACE)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ("eth0", values_.top());
+
+    // Check source (expect 10.0.0.2)
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::SRC)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    vector<uint8_t> a2 = IOAddress("10.0.0.2").toBytes();
+    ASSERT_EQ(a2.size(), values_.top().size());
+    EXPECT_EQ(0, memcmp(&a2[0], &values_.top()[0], a2.size()));
+
+    // Check destination (expect 10.0.0.1)
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::DST)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    vector<uint8_t> a1 = IOAddress("10.0.0.1").toBytes();
+    ASSERT_EQ(a1.size(), values_.top().size());
+    EXPECT_EQ(0, memcmp(&a1[0], &values_.top()[0], a1.size()));
+
+    // Check length (expect 249)
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::LEN)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    uint32_t length = htonl(static_cast<uint32_t>(pkt4_->len()));
+    ASSERT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(&length, &values_.top()[0], 4));
+
+    // Unknown metadata type fails
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::MetadataType(100))));
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data iface with value eth0");
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data src with value 0x0A000002");
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data dst with value 0x0A000001");
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data len with value 0x000000F9");
+    EXPECT_TRUE(checkFile());
+}
+
+// Verifies that DHCPv6 packet metadata can be extracted.
+TEST_F(TokenTest, pkt6MetaData) {
+    pkt6_->setIface("eth0");
+    pkt6_->setLocalAddr(IOAddress("ff02::1:2"));
+    pkt6_->setRemoteAddr(IOAddress("fe80::1234"));
+
+    // Check interface (expect eth0)
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::IFACE)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ("eth0", values_.top());
+
+    // Check source (expect fe80::1234)
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::SRC)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ(16, values_.top().size());
+    EXPECT_EQ(0xfe, static_cast<uint8_t>(values_.top()[0]));
+    EXPECT_EQ(0x80, static_cast<uint8_t>(values_.top()[1]));
+    for (unsigned i = 2; i < 14; ++i) {
+        EXPECT_EQ(0, values_.top()[i]);
+    }
+    EXPECT_EQ(0x12, values_.top()[14]);
+    EXPECT_EQ(0x34, values_.top()[15]);
+
+    // Check destination (expect ff02::1:2)
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::DST)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+    ASSERT_EQ(1, values_.size());
+    vector<uint8_t> ma = IOAddress("ff02::1:2").toBytes();
+    ASSERT_EQ(ma.size(), values_.top().size());
+    EXPECT_EQ(0, memcmp(&ma[0], &values_.top()[0], ma.size()));
+
+    // Check length (expect 16)
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::LEN)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+    ASSERT_EQ(1, values_.size());
+    uint32_t length = htonl(static_cast<uint32_t>(pkt6_->len()));
+    ASSERT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(&length, &values_.top()[0], 4));
+
+    // Unknown meta data type fails
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt(TokenPkt::MetadataType(100))));
+    EXPECT_THROW(t_->evaluate(*pkt6_, values_), EvalTypeError);
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data iface with value eth0");
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data src with value "
+              "0xFE800000000000000000000000001234");
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data dst with value "
+              "0xFF020000000000000000000000010002");
+    addString("EVAL_DEBUG_PKT Pushing PKT meta data len with value 0x00000010");
+    EXPECT_TRUE(checkFile());
+}
+
+// Verifies if the DHCPv4 packet fields can be extracted.
+TEST_F(TokenTest, pkt4Fields) {
+    pkt4_->setGiaddr(IOAddress("192.0.2.1"));
+    pkt4_->setCiaddr(IOAddress("192.0.2.2"));
+    pkt4_->setYiaddr(IOAddress("192.0.2.3"));
+    pkt4_->setSiaddr(IOAddress("192.0.2.4"));
+
+    // We're setting hardware address to uncommon (7 bytes rather than 6 and
+    // hardware type 123) HW address. We'll use it in hlen and htype checks.
+    HWAddrPtr hw(new HWAddr(HWAddr::fromText("01:02:03:04:05:06:07", 123)));
+    pkt4_->setHWAddr(hw);
+
+    // Check hardware address field.
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::CHADDR)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    uint8_t expected_hw[] = { 1, 2, 3, 4, 5, 6, 7 };
+    ASSERT_EQ(7, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected_hw, &values_.top()[0], 7));
+
+    // Check hlen value field.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::HLEN)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ(4, values_.top().size());
+    uint32_t expected_hlen = htonl(7);
+    EXPECT_EQ(0, memcmp(&expected_hlen, &values_.top()[0], 4));
+
+    // Check htype value.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::HTYPE)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ(4, values_.top().size());
+    uint32_t expected_htype = htonl(123);
+    EXPECT_EQ(0, memcmp(&expected_htype, &values_.top()[0], 4));
+
+    // Check giaddr value.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::GIADDR)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    uint8_t expected_addr[] = { 192, 0, 2, 1 };
+    ASSERT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected_addr, &values_.top()[0], 4));
+
+    // Check ciaddr value.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::CIADDR)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    expected_addr[3] = 2;
+    ASSERT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected_addr, &values_.top()[0], 4));
+
+    // Check yiaddr value.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::YIADDR)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    expected_addr[3] = 3;
+    ASSERT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected_addr, &values_.top()[0], 4));
+
+    // Check siaddr value.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::SIADDR)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    expected_addr[3] = 4;
+    ASSERT_EQ(4, values_.top().size());
+    EXPECT_EQ(0, memcmp(expected_addr, &values_.top()[0], 4));
+
+    // Check msgtype.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::MSGTYPE)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ(4, values_.top().size());
+    string exp_msgtype = encode(DHCPDISCOVER);
+    EXPECT_EQ(0, memcmp(&exp_msgtype[0], &values_.top()[0], 4));
+
+    // Check transaction-id
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::TRANSID)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    ASSERT_EQ(4, values_.top().size());
+    string exp_transid = encode(12345);
+    EXPECT_EQ(0, memcmp(&exp_transid[0], &values_.top()[0], 4));
+
+    // Check a DHCPv6 packet throws.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(TokenPkt4::HLEN)));
+    EXPECT_THROW(t_->evaluate(*pkt6_, values_), EvalTypeError);
+
+    // Unknown field fails
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt4(static_cast<TokenPkt4::FieldType>(100))));
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field mac with value 0x01020304050607");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field hlen with value 0x00000007");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field htype with value 0x0000007B");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field giaddr with value 0xC0000201");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field ciaddr with value 0xC0000202");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field yiaddr with value 0xC0000203");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field siaddr with value 0xC0000204");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field msgtype with value 0x00000001");
+    addString("EVAL_DEBUG_PKT4 Pushing PKT4 field transid with value 0x00003039");
+    EXPECT_TRUE(checkFile());
+}
+
+// Verifies if the DHCPv6 packet fields can be extracted.
+TEST_F(TokenTest, pkt6Fields) {
+    // The default test creates a v6 DHCPV6_SOLICIT packet with a
+    // transaction id of 12345.
+
+    // Check the message type
+    ASSERT_NO_THROW(t_.reset(new TokenPkt6(TokenPkt6::MSGTYPE)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+    ASSERT_EQ(1, values_.size());
+    uint32_t expected = htonl(1);
+    EXPECT_EQ(0, memcmp(&expected, &values_.top()[0], 4));
+
+    // Check the transaction id field
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt6(TokenPkt6::TRANSID)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt6_, values_));
+    ASSERT_EQ(1, values_.size());
+    expected = htonl(12345);
+    EXPECT_EQ(0, memcmp(&expected, &values_.top()[0], 4));
+
+    // Check that working with a v4 packet generates an error
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt6(TokenPkt6::TRANSID)));
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // Unknown field fails
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenPkt6(static_cast<TokenPkt6::FieldType>(100))));
+    EXPECT_THROW(t_->evaluate(*pkt6_, values_), EvalTypeError);
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_PKT6 Pushing PKT6 field msgtype with value 0x00000001");
+    addString("EVAL_DEBUG_PKT6 Pushing PKT6 field transid with value 0x00003039");
+
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if we can properly extract the link and peer
+// address fields from relay encapsulations.  Our packet has
+// two relay encapsulations.  We attempt to extract the two
+// fields from both of the encapsulations and compare them.
+// We also try to extract one of the fields from an encapsulation
+// that doesn't exist (level 2), this should result in an empty
+// string.
+TEST_F(TokenTest, relay6Field) {
+    // Values for the address results
+    uint8_t zeroaddr[] = { 0, 0, 0, 0, 0, 0, 0, 0,
+                           0, 0, 0, 0, 0, 0, 0, 0 };
+    uint8_t linkaddr[] = { 0, 1, 0, 0, 0, 0, 0, 0,
+                           0, 0, 0, 0, 0, 0, 0, 1 };
+    uint8_t peeraddr[] = { 0, 1, 0, 0, 0, 0, 0, 0,
+                           0, 0, 0, 0, 0, 0, 0, 2 };
+
+    // We start by adding a set of relay encapsulations to the
+    // basic v6 packet.
+    addRelay6Encapsulations();
+
+    // Then we work our way through the set of choices
+    // Level 0 both link and peer address should be 0::0
+    verifyRelay6Eval(0, TokenRelay6Field::LINKADDR, 16, zeroaddr);
+    verifyRelay6Eval(0, TokenRelay6Field::PEERADDR, 16, zeroaddr);
+
+    // Level 1 link and peer should have different non-zero addresses
+    verifyRelay6Eval(1, TokenRelay6Field::LINKADDR, 16, linkaddr);
+    verifyRelay6Eval(1, TokenRelay6Field::PEERADDR, 16, peeraddr);
+
+    // Level 2 has no encapsulation so the address should be zero length
+    verifyRelay6Eval(2, TokenRelay6Field::LINKADDR, 0, zeroaddr);
+
+    // Level -1 is the same as level 1
+    verifyRelay6Eval(-1, TokenRelay6Field::LINKADDR, 16, linkaddr);
+    verifyRelay6Eval(-1, TokenRelay6Field::PEERADDR, 16, peeraddr);
+
+    // Level -2 is the same as level 0
+    verifyRelay6Eval(-2, TokenRelay6Field::LINKADDR, 16, zeroaddr);
+    verifyRelay6Eval(-2, TokenRelay6Field::PEERADDR, 16, zeroaddr);
+
+    // Level -3 has no encapsulation so the address should be zero length
+    verifyRelay6Eval(-3, TokenRelay6Field::LINKADDR, 0, zeroaddr);
+
+    // Lets check that the layout of the address returned by the
+    // token matches that of the TokenIpAddress
+    TokenPtr trelay;
+    TokenPtr taddr;
+    TokenPtr tequal;
+    ASSERT_NO_THROW(trelay.reset(new TokenRelay6Field(1, TokenRelay6Field::LINKADDR)));
+    ASSERT_NO_THROW(taddr.reset(new TokenIpAddress("1::1")));
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+
+    EXPECT_NO_THROW(trelay->evaluate(*pkt6_, values_));
+    EXPECT_NO_THROW(taddr->evaluate(*pkt6_, values_));
+    EXPECT_NO_THROW(tequal->evaluate(*pkt6_, values_));
+
+    // We should have a single value on the stack and it should be "true"
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // be tidy
+    clearStack();
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field linkaddr nest 0 "
+              "with value 0x00000000000000000000000000000000");
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field peeraddr nest 0 "
+              "with value 0x00000000000000000000000000000000");
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field linkaddr nest 1 "
+              "with value 0x00010000000000000000000000000001");
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field peeraddr nest 1 "
+              "with value 0x00010000000000000000000000000002");
+    addString("EVAL_DEBUG_RELAY6_RANGE Pushing PKT6 relay field linkaddr "
+              "nest 2 with value 0x");
+
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field linkaddr nest -1 "
+              "with value 0x00010000000000000000000000000001");
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field peeraddr nest -1 "
+              "with value 0x00010000000000000000000000000002");
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field linkaddr nest -2 "
+              "with value 0x00000000000000000000000000000000");
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field peeraddr nest -2 "
+              "with value 0x00000000000000000000000000000000");
+    addString("EVAL_DEBUG_RELAY6_RANGE Pushing PKT6 relay field linkaddr "
+              "nest -3 with value 0x");
+
+    addString("EVAL_DEBUG_RELAY6 Pushing PKT6 relay field linkaddr nest 1 "
+              "with value 0x00010000000000000000000000000001");
+    addString("EVAL_DEBUG_IPADDRESS Pushing IPAddress "
+              "0x00010000000000000000000000000001");
+    addString("EVAL_DEBUG_EQUAL Popping 0x00010000000000000000000000000001 "
+              "and 0x00010000000000000000000000000001 pushing result 'true'");
+
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks some error cases for a relay6 field token
+TEST_F(TokenTest, relay6FieldError) {
+    // Create a valid relay6 field token
+    ASSERT_NO_THROW(t_.reset(new TokenRelay6Field(0, TokenRelay6Field::LINKADDR)));
+
+    // a DHCPv6 packet is required
+    ASSERT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // No test for unknown field as it is not (yet) checked?!
+}
+
+// This test checks if a token representing an == operator is able to
+// compare two values (with incorrectly built stack).
+TEST_F(TokenTest, optionEqualInvalid) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenEqual()));
+
+    // CASE 1: There's not enough values on the stack. == is an operator that
+    // takes two parameters. There are 0 on the stack.
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // CASE 2: One value is still not enough.
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+}
+
+// This test checks if a token representing an == operator is able to
+// compare two different values.
+TEST_F(TokenTest, optionEqualFalse) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenEqual()));
+
+    values_.push("foo");
+    values_.push("bar");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be a single value that represents
+    // result of "foo" == "bar" comparison.
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_EQUAL Popping 0x626172 and 0x666F6F "
+              "pushing result 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an == operator is able to
+// compare two identical values.
+TEST_F(TokenTest, optionEqualTrue) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenEqual()));
+
+    values_.push("foo");
+    values_.push("foo");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be a single value that represents
+    // result of "foo" == "foo" comparison.
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_EQUAL Popping 0x666F6F and 0x666F6F "
+              "pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing a substring request
+// throws an exception if there aren't enough values on the stack.
+// The stack from the top is: length, start, string.
+// The actual packet is not used.
+TEST_F(TokenTest, substringNotEnoughValues) {
+    ASSERT_NO_THROW(t_.reset(new TokenSubstring()));
+
+    // Substring requires three values on the stack, try
+    // with 0, 1 and 2 all should throw an exception
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    values_.push("");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    values_.push("0");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // Three should work
+    values_.push("0");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // As we had an empty string to start with we should have an empty
+    // one after the evaluate
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING_EMPTY Popping length 0, start 0, "
+              "string 0x pushing result 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test getting the whole string in different ways
+TEST_F(TokenTest, substringWholeString) {
+    // Get the whole string
+    verifySubstringEval("foobar", "0", "6", "foobar");
+
+    // Get the whole string with "all"
+    verifySubstringEval("foobar", "0", "all", "foobar");
+
+    // Get the whole string with an extra long number
+    verifySubstringEval("foobar", "0", "123456", "foobar");
+
+    // Get the whole string counting from the back
+    verifySubstringEval("foobar", "-6", "all", "foobar");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING Popping length 6, start 0, "
+              "string 0x666F6F626172 pushing result 0x666F6F626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length all, start 0, "
+              "string 0x666F6F626172 pushing result 0x666F6F626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 123456, start 0, "
+              "string 0x666F6F626172 pushing result 0x666F6F626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length all, start -6, "
+              "string 0x666F6F626172 pushing result 0x666F6F626172");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test getting a suffix, in this case the last 3 characters
+TEST_F(TokenTest, substringTrailer) {
+    verifySubstringEval("foobar", "3", "3", "bar");
+    verifySubstringEval("foobar", "3", "all", "bar");
+    verifySubstringEval("foobar", "-3", "all", "bar");
+    verifySubstringEval("foobar", "-3", "123", "bar");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING Popping length 3, start 3, "
+              "string 0x666F6F626172 pushing result 0x626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length all, start 3, "
+              "string 0x666F6F626172 pushing result 0x626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length all, start -3, "
+              "string 0x666F6F626172 pushing result 0x626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 123, start -3, "
+              "string 0x666F6F626172 pushing result 0x626172");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test getting the middle of the string in different ways
+TEST_F(TokenTest, substringMiddle) {
+    verifySubstringEval("foobar", "1", "4", "ooba");
+    verifySubstringEval("foobar", "-5", "4", "ooba");
+    verifySubstringEval("foobar", "-1", "-4", "ooba");
+    verifySubstringEval("foobar", "5", "-4", "ooba");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start 1, "
+              "string 0x666F6F626172 pushing result 0x6F6F6261");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start -5, "
+              "string 0x666F6F626172 pushing result 0x6F6F6261");
+    addString("EVAL_DEBUG_SUBSTRING Popping length -4, start -1, "
+              "string 0x666F6F626172 pushing result 0x6F6F6261");
+    addString("EVAL_DEBUG_SUBSTRING Popping length -4, start 5, "
+              "string 0x666F6F626172 pushing result 0x6F6F6261");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test getting the last letter in different ways
+TEST_F(TokenTest, substringLastLetter) {
+    verifySubstringEval("foobar", "5", "all", "r");
+    verifySubstringEval("foobar", "5", "1", "r");
+    verifySubstringEval("foobar", "5", "5", "r");
+    verifySubstringEval("foobar", "-1", "all", "r");
+    verifySubstringEval("foobar", "-1", "1", "r");
+    verifySubstringEval("foobar", "-1", "5", "r");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING Popping length all, start 5, "
+              "string 0x666F6F626172 pushing result 0x72");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 1, start 5, "
+              "string 0x666F6F626172 pushing result 0x72");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 5, start 5, "
+              "string 0x666F6F626172 pushing result 0x72");
+    addString("EVAL_DEBUG_SUBSTRING Popping length all, start -1, "
+              "string 0x666F6F626172 pushing result 0x72");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 1, start -1, "
+              "string 0x666F6F626172 pushing result 0x72");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 5, start -1, "
+              "string 0x666F6F626172 pushing result 0x72");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test we get only what is available if we ask for a longer string
+TEST_F(TokenTest, substringLength) {
+    // Test off the front
+    verifySubstringEval("foobar", "0", "-4", "");
+    verifySubstringEval("foobar", "1", "-4", "f");
+    verifySubstringEval("foobar", "2", "-4", "fo");
+    verifySubstringEval("foobar", "3", "-4", "foo");
+
+    // and the back
+    verifySubstringEval("foobar", "3", "4", "bar");
+    verifySubstringEval("foobar", "4", "4", "ar");
+    verifySubstringEval("foobar", "5", "4", "r");
+    verifySubstringEval("foobar", "6", "4", "");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING Popping length -4, start 0, "
+              "string 0x666F6F626172 pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING Popping length -4, start 1, "
+              "string 0x666F6F626172 pushing result 0x66");
+    addString("EVAL_DEBUG_SUBSTRING Popping length -4, start 2, "
+              "string 0x666F6F626172 pushing result 0x666F");
+    addString("EVAL_DEBUG_SUBSTRING Popping length -4, start 3, "
+              "string 0x666F6F626172 pushing result 0x666F6F");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start 3, "
+              "string 0x666F6F626172 pushing result 0x626172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start 4, "
+              "string 0x666F6F626172 pushing result 0x6172");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start 5, "
+              "string 0x666F6F626172 pushing result 0x72");
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length 4, start 6, "
+              "string 0x666F6F626172 pushing result 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test that we get nothing if the starting position is out of the string
+TEST_F(TokenTest, substringStartingPosition) {
+    // Off the front
+    verifySubstringEval("foobar", "-7", "1", "");
+    verifySubstringEval("foobar", "-7", "-11", "");
+    verifySubstringEval("foobar", "-7", "all", "");
+
+    // and the back
+    verifySubstringEval("foobar", "6", "1", "");
+    verifySubstringEval("foobar", "6", "-11", "");
+    verifySubstringEval("foobar", "6", "all", "");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length 1, start -7, "
+              "string 0x666F6F626172 pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length -11, start -7, "
+              "string 0x666F6F626172 pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length all, start -7, "
+              "string 0x666F6F626172 pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length 1, start 6, "
+              "string 0x666F6F626172 pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length -11, start 6, "
+              "string 0x666F6F626172 pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING_RANGE Popping length all, start 6, "
+              "string 0x666F6F626172 pushing result 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// Check what happens if we use strings that aren't numbers for start or length
+// We should return the empty string
+TEST_F(TokenTest, substringBadParams) {
+    verifySubstringEval("foobar", "0ick", "all", "", true);
+    verifySubstringEval("foobar", "ick0", "all", "", true);
+    verifySubstringEval("foobar", "ick", "all", "", true);
+    verifySubstringEval("foobar", "0", "ick", "", true);
+    verifySubstringEval("foobar", "0", "0ick", "", true);
+    verifySubstringEval("foobar", "0", "ick0", "", true);
+    verifySubstringEval("foobar", "0", "allaboard", "", true);
+
+    // These should result in a throw which should generate it's own
+    // log entry
+}
+
+// lastly check that we don't get anything if the string is empty or
+// we don't ask for any characters from it.
+TEST_F(TokenTest, substringReturnEmpty) {
+    verifySubstringEval("", "0", "all", "");
+    verifySubstringEval("foobar", "0", "0", "");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING_EMPTY Popping length all, start 0, "
+              "string 0x pushing result 0x");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 0, start 0, "
+              "string 0x666F6F626172 pushing result 0x");
+    EXPECT_TRUE(checkFile());
+}
+
+// Check if we can use the substring and equal tokens together
+// We put the result on the stack first then the substring values
+// then evaluate the substring which should leave the original
+// result on the bottom with the substring result on next.
+// Evaluating the equals should produce true for the first
+// and false for the second.
+// throws an exception if there aren't enough values on the stack.
+// The stack from the top is: length, start, string.
+// The actual packet is not used.
+TEST_F(TokenTest, substringEquals) {
+    TokenPtr tequal;
+
+    ASSERT_NO_THROW(t_.reset(new TokenSubstring()));
+    ASSERT_NO_THROW(tequal.reset(new TokenEqual()));
+
+    // The final expected value
+    values_.push("ooba");
+
+    // The substring values
+    values_.push("foobar");
+    values_.push("1");
+    values_.push("4");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have two values on the stack
+    ASSERT_EQ(2, values_.size());
+
+    // next the equals eval
+    EXPECT_NO_THROW(tequal->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // get rid of the result
+    values_.pop();
+
+    // and try it again but with a bad final value
+    // The final expected value
+    values_.push("foob");
+
+    // The substring values
+    values_.push("foobar");
+    values_.push("1");
+    values_.push("4");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have two values on the stack
+    ASSERT_EQ(2, values_.size());
+
+    // next the equals eval
+    EXPECT_NO_THROW(tequal->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start 1, "
+              "string 0x666F6F626172 pushing result 0x6F6F6261");
+    addString("EVAL_DEBUG_EQUAL Popping 0x6F6F6261 and 0x6F6F6261 "
+              "pushing result 'true'");
+    addString("EVAL_DEBUG_SUBSTRING Popping length 4, start 1, "
+              "string 0x666F6F626172 pushing result 0x6F6F6261");
+    addString("EVAL_DEBUG_EQUAL Popping 0x6F6F6261 and 0x666F6F62 "
+              "pushing result 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing a concat request
+// throws an exception if there aren't enough values on the stack.
+// The actual packet is not used.
+TEST_F(TokenTest, concat) {
+    ASSERT_NO_THROW(t_.reset(new TokenConcat()));
+
+    // Concat requires two values on the stack, try
+    // with 0 and 1 both should throw an exception
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // Two should work
+    values_.push("bar");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // Check the result
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("foobar", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_CONCAT Popping 0x626172 and 0x666F6F "
+              "pushing 0x666F6F626172");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing a hexstring request
+// throws an exception if there aren't enough values on the stack.
+// The actual packet is not used.
+TEST_F(TokenTest, tohexstring) {
+    ASSERT_NO_THROW(t_.reset(new TokenToHexString()));
+
+    // Hexstring requires two values on the stack, try
+    // with 0 and 1 both should throw an exception
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // Two should work
+    values_.push("-");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // Check the result
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("66-6f-6f", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_TOHEXSTRING Popping binary value 0x666F6F and "
+              "separator -, pushing result 66-6f-6f");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an ifelse is able
+// to select the branch following the condition.
+TEST_F(TokenTest, ifElse) {
+    ASSERT_NO_THROW(t_.reset(new TokenIfElse()));
+
+    // Ifelse requires three values on the stack, try
+    // with 0, 1 and 2 all should throw an exception
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    values_.push("bar");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // The condition must be a boolean
+    values_.push("bar");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // Check if what it returns
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenIfElse()));
+    values_.push("true");
+    values_.push("foo");
+    values_.push("bar");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("foo", values_.top());
+
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenIfElse()));
+    values_.push("false");
+    values_.push("foo");
+    values_.push("bar");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("bar", values_.top());
+}
+
+// This test checks if a token representing a not is able to
+// negate a boolean value (with incorrectly built stack).
+TEST_F(TokenTest, operatorNotInvalid) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenNot()));
+
+    // CASE 1: The stack is empty.
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // CASE 2: The top value is not a boolean
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+}
+
+// This test checks if a token representing a not operator is able to
+// negate a boolean value.
+TEST_F(TokenTest, operatorNot) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenNot()));
+
+    values_.push("true");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be the negation of the value.
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Double negation is identity.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_NOT Popping 'true' pushing 'false'");
+    addString("EVAL_DEBUG_NOT Popping 'false' pushing 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an and is able to
+// conjugate two values (with incorrectly built stack).
+TEST_F(TokenTest, operatorAndInvalid) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenAnd()));
+
+    // CASE 1: There's not enough values on the stack. and is an operator that
+    // takes two parameters. There are 0 on the stack.
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // CASE 2: One value is still not enough.
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // CASE 3: The two values must be logical
+    values_.push("true");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // Swap the 2 values
+    values_.push("true");
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+}
+
+// This test checks if a token representing an and operator is able to
+// conjugate false with another logical
+TEST_F(TokenTest, operatorAndFalse) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenAnd()));
+
+    values_.push("true");
+    values_.push("false");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be a single "false" value
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // After true and false, check false and true
+    values_.push("true");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // And false and false
+    values_.push("false");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_AND Popping 'false' and 'true' pushing 'false'");
+    addString("EVAL_DEBUG_AND Popping 'true' and 'false' pushing 'false'");
+    addString("EVAL_DEBUG_AND Popping 'false' and 'false' pushing 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an and is able to
+// conjugate two true values.
+TEST_F(TokenTest, operatorAndTrue) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenAnd()));
+
+    values_.push("true");
+    values_.push("true");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be a single "true" value
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_AND Popping 'true' and 'true' pushing 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an or is able to
+// combine two values (with incorrectly built stack).
+TEST_F(TokenTest, operatorOrInvalid) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenOr()));
+
+    // CASE 1: There's not enough values on the stack. or is an operator that
+    // takes two parameters. There are 0 on the stack.
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // CASE 2: One value is still not enough.
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalBadStack);
+
+    // CASE 3: The two values must be logical
+    values_.push("true");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+
+    // Swap the 2 values
+    values_.push("true");
+    values_.push("foo");
+    EXPECT_THROW(t_->evaluate(*pkt4_, values_), EvalTypeError);
+}
+
+// This test checks if a token representing an or is able to
+// conjugate two false values.
+TEST_F(TokenTest, operatorOrFalse) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenOr()));
+
+    values_.push("false");
+    values_.push("false");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be a single "false" value
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OR Popping 'false' and 'false' pushing 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks if a token representing an == operator is able to
+// conjugate true with another logical
+TEST_F(TokenTest, operatorOrTrue) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenOr()));
+
+    values_.push("false");
+    values_.push("true");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // After evaluation there should be a single "true" value
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // After false or true, checks true or false
+    values_.push("false");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // And true or true
+    values_.push("true");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_OR Popping 'true' and 'false' pushing 'true'");
+    addString("EVAL_DEBUG_OR Popping 'false' and 'true' pushing 'true'");
+    addString("EVAL_DEBUG_OR Popping 'true' and 'true' pushing 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies client class membership
+TEST_F(TokenTest, member) {
+
+    ASSERT_NO_THROW(t_.reset(new TokenMember("foo")));
+
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // the packet has no classes so false was left on the stack
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+    values_.pop();
+
+    // Add bar and retry
+    pkt4_->addClass("bar");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // the packet has a class but it is not foo
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+    values_.pop();
+
+    // Add foo and retry
+    pkt4_->addClass("foo");
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // Now the packet is in the foo class
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+}
+
+// This test verifies if expression vendor[4491].exists works properly in DHCPv4.
+TEST_F(TokenTest, vendor4SpecificVendorExists) {
+    // Case 1: no option, should evaluate to false
+    testVendorExists(Option::V4, 4491, 0, "false");
+
+    // Case 2: option present, but uses different enterprise-id, should fail
+    testVendorExists(Option::V4, 4491, 1234, "false");
+
+    // Case 3: option present and has matching enterprise-id, should succeed
+    testVendorExists(Option::V4, 4491, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 125 missing, "
+              "pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies if expression vendor[4491].exists works properly in DHCPv6.
+TEST_F(TokenTest, vendor6SpecificVendorExists) {
+    // Case 1: no option, should evaluate to false
+    testVendorExists(Option::V6, 4491, 0, "false");
+
+    // Case 2: option present, but uses different enterprise-id, should fail
+    testVendorExists(Option::V6, 4491, 1234, "false");
+
+    // Case 3: option present and has matching enterprise-id, should succeed
+    testVendorExists(Option::V6, 4491, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 17 missing, "
+              "pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+/// Test if expression vendor[*].exists works properly for DHCPv4.
+TEST_F(TokenTest, vendor4AnyVendorExists) {
+    // Case 1: no option, should evaluate to false
+    testVendorExists(Option::V4, 0, 0, "false");
+
+    // Case 2: option present with vendor-id 1234, should succeed
+    testVendorExists(Option::V4, 0, 1234, "true");
+
+    // Case 3: option present with vendor-id 4491, should succeed
+    testVendorExists(Option::V4, 0, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 125 missing, "
+              "pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id 1234 "
+              "found, pushing result 'true'");
+    addString("EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test if expression vendor[*].exists works properly for DHCPv6.
+TEST_F(TokenTest, vendor6AnyVendorExists) {
+    // Case 1: no option, should evaluate to false
+    testVendorExists(Option::V6, 0, 0, "false");
+
+    // Case 2: option present with vendor-id 1234, should succeed
+    testVendorExists(Option::V6, 0, 1234, "true");
+
+    // Case 3: option present with vendor-id 4491, should succeed
+    testVendorExists(Option::V6, 0, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 17 missing, "
+              "pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id 1234 "
+              "found, pushing result 'true'");
+    addString("EVAL_DEBUG_VENDOR_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test if expression vendor[*].enterprise works properly for DHCPv4.
+TEST_F(TokenTest, vendor4enterprise) {
+    // Case 1: No option present, should return empty string
+    testVendorEnterprise(Option::V4, 0, "");
+
+    // Case 2: Option with vendor-id 1234, should return "1234"
+    testVendorEnterprise(Option::V4, 1234, encode(1234));
+
+    // Case 3: Option with vendor-id set to maximum value, should still
+    // be able to handle it
+    testVendorEnterprise(Option::V4, 4294967295, encode(4294967295));
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 125 missing, pushing"
+              " result ''");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID Pushing enterprise-id 1234 as "
+              "result 0x000004D2");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID Pushing enterprise-id 4294967295"
+              " as result 0xFFFFFFFF");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test if expression vendor[*].enterprise works properly for DHCPv6.
+TEST_F(TokenTest, vendor6enterprise) {
+    // Case 1: No option present, should return empty string
+    testVendorEnterprise(Option::V6, 0, "");
+
+    // Case 2: Option with vendor-id 1234, should return "1234"
+    testVendorEnterprise(Option::V6, 1234, encode(1234));
+
+    // Case 3: Option with vendor-id set to maximum value, should still
+    // be able to handle it
+    testVendorEnterprise(Option::V6, 4294967295, encode(4294967295));
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 17 missing, pushing"
+              " result ''");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID Pushing enterprise-id 1234 as "
+              "result 0x000004D2");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID Pushing enterprise-id 4294967295 "
+              "as result 0xFFFFFFFF");
+    EXPECT_TRUE(checkFile());
+}
+
+// This one tests "vendor[4491].option[1].exists" expression. There are so many
+// wonderful ways in which this could fail: the option could not be there,
+// it could have different enterprise-id, may not have suboption 1. Or may
+// have the suboption with valid type, but enterprise may be different.
+TEST_F(TokenTest, vendor4SuboptionExists) {
+    // Case 1: expression vendor[4491].option[1].exists, no option present
+    testVendorSuboption(Option::V4, 4491, 1, 0, 0, TokenOption::EXISTS, "false");
+
+    // Case 2: expression vendor[4491].option[1].exists, option with vendor-id = 1234,
+    // no suboptions, expected result "false"
+    testVendorSuboption(Option::V4, 4491, 1, 1234, 0, TokenOption::EXISTS, "false");
+
+    // Case 3: expression vendor[4491].option[1].exists, option with vendor-id = 1234,
+    // suboption 1, expected result "false"
+    testVendorSuboption(Option::V4, 4491, 1, 1234, 1, TokenOption::EXISTS, "false");
+
+    // Case 4: expression vendor[4491].option[1].exists, option with vendor-id = 4491,
+    // suboption 2, expected result "false"
+    testVendorSuboption(Option::V4, 4491, 1, 4491, 2, TokenOption::EXISTS, "false");
+
+    // Case 5: expression vendor[4491].option[1].exists, option with vendor-id = 4491,
+    // suboption 1, expected result "true"
+    testVendorSuboption(Option::V4, 4491, 1, 4491, 1, TokenOption::EXISTS, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 125 missing, pushing "
+              "result 'false'");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 'false'");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This is similar to the previous one, but tests vendor[4491].option[1].exists
+// for DHCPv6.
+TEST_F(TokenTest, vendor6SuboptionExists) {
+    // Case 1: expression vendor[4491].option[1].exists, no option present
+    testVendorSuboption(Option::V6, 4491, 1, 0, 0, TokenOption::EXISTS, "false");
+
+    // Case 2: expression vendor[4491].option[1].exists, option with vendor-id = 1234,
+    // no suboptions, expected result "false"
+    testVendorSuboption(Option::V6, 4491, 1, 1234, 0, TokenOption::EXISTS, "false");
+
+    // Case 3: expression vendor[4491].option[1].exists, option with vendor-id = 1234,
+    // suboption 1, expected result "false"
+    testVendorSuboption(Option::V6, 4491, 1, 1234, 1, TokenOption::EXISTS, "false");
+
+    // Case 4: expression vendor[4491].option[1].exists, option with vendor-id = 4491,
+    // suboption 2, expected result "false"
+    testVendorSuboption(Option::V6, 4491, 1, 4491, 2, TokenOption::EXISTS, "false");
+
+    // Case 5: expression vendor[4491].option[1].exists, option with vendor-id = 4491,
+    // suboption 1, expected result "true"
+    testVendorSuboption(Option::V6, 4491, 1, 4491, 1, TokenOption::EXISTS, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 17 missing, pushing "
+              "result 'false'");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 'false'");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies if vendor[4491].option[1].hex expression properly returns
+// value of said sub-option or empty string if desired option is not present.
+// This test is for DHCPv4.
+TEST_F(TokenTest, vendor4SuboptionHex) {
+    // Case 1: no option present, should return empty string
+    testVendorSuboption(Option::V4, 4491, 1, 0, 0, TokenOption::HEXADECIMAL, "");
+
+    // Case 2: option with vendor-id = 1234, no suboptions, expected result ""
+    testVendorSuboption(Option::V4, 4491, 1, 1234, 0, TokenOption::HEXADECIMAL, "");
+
+    // Case 3: option with vendor-id = 1234, suboption 1, expected result ""
+    testVendorSuboption(Option::V4, 4491, 1, 1234, 1, TokenOption::HEXADECIMAL, "");
+
+    // Case 4: option with vendor-id = 4491, suboption 2, expected result ""
+    testVendorSuboption(Option::V4, 4491, 1, 4491, 2, TokenOption::HEXADECIMAL, "");
+
+    // Case 5: option with vendor-id = 4491, suboption 1, expected result content
+    // of the option
+    testVendorSuboption(Option::V4, 4491, 1, 4491, 1, TokenOption::HEXADECIMAL, "alpha");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 125 missing, pushing "
+              "result ''");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 0x");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 0x616C706861");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies if vendor[4491].option[1].hex expression properly returns
+// value of said sub-option or empty string if desired option is not present.
+// This test is for DHCPv4.
+TEST_F(TokenTest, vendor6SuboptionHex) {
+    // Case 1: no option present, should return empty string
+    testVendorSuboption(Option::V6, 4491, 1, 0, 0, TokenOption::HEXADECIMAL, "");
+
+    // Case 2: option with vendor-id = 1234, no suboptions, expected result ""
+    testVendorSuboption(Option::V6, 4491, 1, 1234, 0, TokenOption::HEXADECIMAL, "");
+
+    // Case 3: option with vendor-id = 1234, suboption 1, expected result ""
+    testVendorSuboption(Option::V6, 4491, 1, 1234, 1, TokenOption::HEXADECIMAL, "");
+
+    // Case 4: option with vendor-id = 4491, suboption 2, expected result ""
+    testVendorSuboption(Option::V6, 4491, 1, 4491, 2, TokenOption::HEXADECIMAL, "");
+
+    // Case 5: option with vendor-id = 4491, suboption 1, expected result content
+    // of the option
+    testVendorSuboption(Option::V6, 4491, 1, 4491, 1, TokenOption::HEXADECIMAL, "alpha");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_NO_OPTION Option with code 17 missing, pushing "
+              "result ''");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH Was looking for 4491, "
+              "option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 0x");
+    addString("EVAL_DEBUG_OPTION Pushing option 1 with value 0x616C706861");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that "vendor-class[4491].exists" expression can be used
+// in DHCPv4.
+TEST_F(TokenTest, vendorClass4SpecificVendorExists) {
+    // Case 1: no option present, should fail
+    testVendorClassExists(Option::V4, 4491, 0, "false");
+
+    // Case 2: option exists, but has different vendor-id (1234), should fail
+    testVendorClassExists(Option::V4, 4491, 1234, "false");
+
+    // Case 3: option exists and has matching vendor-id, should succeed
+    testVendorClassExists(Option::V4, 4491, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 124 missing, "
+              "pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that "vendor-class[4491].exists" expression can be used
+// in DHCPv6.
+TEST_F(TokenTest, vendorClass6SpecificVendorExists) {
+    // Case 1: no option present, should fail
+    testVendorClassExists(Option::V6, 4491, 0, "false");
+
+    // Case 2: option exists, but has different vendor-id (1234), should fail
+    testVendorClassExists(Option::V6, 4491, 1234, "false");
+
+    // Case 3: option exists and has matching vendor-id, should succeed
+    testVendorClassExists(Option::V6, 4491, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 16 missing, pushing "
+              "result 'false'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that "vendor-class[*].exists" can be used in DHCPv4
+// and it matches a vendor class option with any vendor-id.
+TEST_F(TokenTest, vendorClass4AnyVendorExists) {
+    // Case 1: no option present, should fail
+    testVendorClassExists(Option::V4, 0, 0, "false");
+
+    // Case 2: option exists, should succeed, regardless of the vendor-id
+    testVendorClassExists(Option::V4, 0, 1234, "true");
+
+    // Case 3: option exists, should succeed, regardless of the vendor-id
+    testVendorClassExists(Option::V4, 0, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 124 missing, "
+              "pushing result 'false'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id 1234 "
+              "found, pushing result 'true'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that "vendor-class[*].exists" can be used in DHCPv6
+// and it matches a vendor class option with any vendor-id.
+TEST_F(TokenTest, vendorClass6AnyVendorExists) {
+    // Case 1: no option present, should fail
+    testVendorClassExists(Option::V6, 0, 0, "false");
+
+    // Case 2: option exists, should succeed, regardless of the vendor-id
+    testVendorClassExists(Option::V6, 0, 1234, "true");
+
+    // Case 3: option exists, should succeed, regardless of the vendor-id
+    testVendorClassExists(Option::V6, 0, 4491, "true");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 16 missing, pushing "
+              "result 'false'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id 1234 "
+              "found, pushing result 'true'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_EXISTS Option with enterprise-id 4491 "
+              "found, pushing result 'true'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test if expression "vendor-class.enterprise" works properly for DHCPv4.
+TEST_F(TokenTest, vendorClass4enterprise) {
+    // Case 1: No option present, should return empty string
+    testVendorClassEnterprise(Option::V4, 0, "");
+
+    // Case 2: Option with vendor-id 1234, should return "1234"
+    testVendorClassEnterprise(Option::V4, 1234, encode(1234));
+
+    // Case 3: Option with vendor-id set to maximum value, should still
+    // be able to handle it
+    testVendorClassEnterprise(Option::V4, 4294967295, encode(4294967295));
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 124 missing, pushing "
+              "result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID Pushing enterprise-id "
+              "1234 as result 0x000004D2");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID Pushing enterprise-id "
+              "4294967295 as result 0xFFFFFFFF");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test if expression "vendor-class.enterprise" works properly for DHCPv6.
+TEST_F(TokenTest, vendorClass6enterprise) {
+    // Case 1: No option present, should return empty string
+    testVendorClassEnterprise(Option::V6, 0, "");
+
+    // Case 2: Option with vendor-id 1234, should return "1234"
+    testVendorClassEnterprise(Option::V6, 1234, encode(1234));
+
+    // Case 3: Option with vendor-id set to maximum value, should still
+    // be able to handle it.
+    testVendorClassEnterprise(Option::V6, 4294967295, encode(4294967295));
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 16 missing, pushing "
+              "result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID Pushing enterprise-id "
+              "1234 as result 0x000004D2");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID Pushing enterprise-id "
+              "4294967295 as result 0xFFFFFFFF");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test that expression "vendor-class[4491].data" is able to retrieve content
+// of the first tuple of the vendor-class option in DHCPv4.
+TEST_F(TokenTest, vendorClass4SpecificVendorData) {
+    // Case 1: Expression looks for vendor-id 4491, data[0], there is no
+    // vendor-class option at all, expected result is empty string.
+    testVendorClassData(Option::V4, 4491, 0, 0, 0, "");
+
+    // Case 2: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 1234 and no data, expected result is empty string.
+    testVendorClassData(Option::V4, 4491, 0, 1234, 0, "");
+
+    // Case 3: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 4491 and no data, expected result is empty string.
+    // Note that vendor option in v4 always have at least one data chunk, even though
+    // it may be empty. The OptionVendor code was told to not create any special
+    // tuples, but it creates one empty on its own. So the code finds that one
+    // tuple and extracts its content (an empty string).
+    testVendorClassData(Option::V4, 4491, 0, 4491, 0, "");
+
+    // Case 4: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 1234 and 1 data tuple, expected result is empty string
+    testVendorClassData(Option::V4, 4491, 0, 1234, 1, "");
+
+    // Case 5: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 4491 and 1 data tuple, expected result is
+    // content of that data ("alpha")
+    testVendorClassData(Option::V4, 4491, 0, 4491, 1, "alpha");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 124 missing, "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in vendor "
+              "class found, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in vendor "
+              "class found, pushing result 'alpha'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test that expression "vendor-class[4491].data" is able to retrieve content
+// of the first tuple of the vendor-class option in DHCPv6.
+TEST_F(TokenTest, vendorClass6SpecificVendorData) {
+    // Case 1: Expression looks for vendor-id 4491, data[0], there is no
+    // vendor-class option at all, expected result is empty string.
+    testVendorClassData(Option::V6, 4491, 0, 0, 0, "");
+
+    // Case 2: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 1234 and no data, expected result is empty string.
+    testVendorClassData(Option::V6, 4491, 0, 1234, 0, "");
+
+    // Case 3: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 4491 and no data, expected result is empty string
+    testVendorClassData(Option::V6, 4491, 0, 4491, 0, "");
+
+    // Case 4: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 1234 and 1 data tuple, expected result is empty string
+    testVendorClassData(Option::V6, 4491, 0, 1234, 1, "");
+
+    // Case 5: Expression looks for vendor-id 4491, data[0], there is
+    // vendor-class with vendor-id 4491 and 1 data tuple, expected result is
+    // content of that data ("alpha")
+    testVendorClassData(Option::V6, 4491, 0, 4491, 1, "alpha");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 16 missing, "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 0, "
+              "but option with enterprise-id 4491 has only 0 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in vendor "
+              "class found, pushing result 'alpha'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test that expression "vendor-class[*].data" is able to retrieve content
+// of the first tuple of the vendor-class option in DHCPv4.
+TEST_F(TokenTest, vendorClass4AnyVendorData) {
+    // Case 1: Expression looks for any vendor-id (0), data[0], there is no
+    // vendor-class option at all, expected result is empty string.
+    testVendorClassData(Option::V4, 0, 0, 0, 0, "");
+
+    // Case 2: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 1234 and no data (one empty tuple), expected
+    // result is empty string.
+    testVendorClassData(Option::V4, 0, 0, 1234, 0, "");
+
+    // Case 3: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 4491 and no data (one empty tuple), expected
+    // result is empty string.
+    testVendorClassData(Option::V4, 0, 0, 4491, 0, "");
+
+    // Case 4: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 1234 and 1 data tuple, expected result is
+    // content of that data ("alpha")
+    testVendorClassData(Option::V4, 0, 0, 1234, 1, "alpha");
+
+    // Case 5: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 4491 and 1 data tuple, expected result is
+    // content of that data ("alpha")
+    testVendorClassData(Option::V4, 0, 0, 4491, 1, "alpha");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 124 missing, "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in "
+              "vendor class found, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in "
+              "vendor class found, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in "
+              "vendor class found, pushing result 'alpha'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in "
+              "vendor class found, pushing result 'alpha'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Test that expression "vendor-class[*].data" is able to retrieve content
+// of the first tuple of the vendor-class option in DHCPv6.
+TEST_F(TokenTest, vendorClass6AnyVendorData) {
+    // Case 1: Expression looks for any vendor-id (0), data[0], there is no
+    // vendor-class option at all, expected result is empty string.
+    testVendorClassData(Option::V6, 0, 0, 0, 0, "");
+
+    // Case 2: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 1234 and no data, expected result is empty string.
+    testVendorClassData(Option::V6, 0, 0, 1234, 0, "");
+
+    // Case 3: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 4491 and no data, expected result is empty string
+    testVendorClassData(Option::V6, 0, 0, 4491, 0, "");
+
+    // Case 4: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 1234 and 1 data tuple, expected result is
+    // content of that data ("alpha")
+    testVendorClassData(Option::V6, 0, 0, 1234, 1, "alpha");
+
+    // Case 5: Expression looks for any vendor-id (0), data[0], there is
+    // vendor-class with vendor-id 4491 and 1 data tuple, expected result is
+    // content of that data ("alpha")
+    testVendorClassData(Option::V6, 0, 0, 4491, 1, "alpha");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 16 missing, "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 0, "
+              "but option with enterprise-id 1234 has only 0 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 0, "
+              "but option with enterprise-id 4491 has only 0 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in vendor "
+              "class found, pushing result 'alpha'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 0 (out of 1 received) in vendor "
+              "class found, pushing result 'alpha'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies if expression vendor-class[4491].data[3] is able to access
+// the tuple specified by index. This is a DHCPv4 test.
+TEST_F(TokenTest, vendorClass4DataIndex) {
+    // Case 1: Expression looks for vendor-id 4491, data[3], there is no
+    // vendor-class option at all, expected result is empty string.
+    testVendorClassData(Option::V4, 4491, 3, 0, 0, "");
+
+    // Case 2: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 1234 and no data, expected result is empty string.
+    testVendorClassData(Option::V4, 4491, 3, 1234, 0, "");
+
+    // Case 3: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 4491 and no data, expected result is empty string
+    testVendorClassData(Option::V4, 4491, 3, 4491, 0, "");
+
+    // Case 4: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 1234 and 1 data tuple, expected result is empty string.
+    testVendorClassData(Option::V4, 4491, 3, 1234, 1, "");
+
+    // Case 5: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 4491, but has only 3 data tuples, expected
+    // result is empty string.
+    testVendorClassData(Option::V4, 4491, 3, 4491, 3, "");
+
+    // Case 6: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 4491 and 5 data tuples, expected result is
+    // content of that tuple ("gamma")
+    testVendorClassData(Option::V4, 4491, 3, 4491, 5, "gamma");
+
+    // Case 6: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 1234 and 5 data tuples, expected result is
+    // empty string, because vendor-id does not match.
+    testVendorClassData(Option::V4, 4491, 3, 1234, 5, "");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 124 missing, "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 3, "
+              "but option with enterprise-id 4491 has only 1 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 3, "
+              "but option with enterprise-id 4491 has only 3 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 3 (out of 5 received) in vendor "
+              "class found, pushing result 'gamma'");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies if expression vendor-class[4491].data[3] is able to access
+// the tuple specified by index. This is a DHCPv6 test.
+TEST_F(TokenTest, vendorClass6DataIndex) {
+    // Case 1: Expression looks for vendor-id 4491, data[3], there is no
+    // vendor-class option at all, expected result is empty string.
+    testVendorClassData(Option::V6, 4491, 3, 0, 0, "");
+
+    // Case 2: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 1234 and no data, expected result is empty string.
+    testVendorClassData(Option::V6, 4491, 3, 1234, 0, "");
+
+    // Case 3: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 4491 and no data, expected result is empty string
+    testVendorClassData(Option::V6, 4491, 3, 4491, 0, "");
+
+    // Case 4: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 1234 and 5 data tuples, expected result is empty string.
+    testVendorClassData(Option::V6, 4491, 3, 1234, 5, "");
+
+    // Case 5: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 4491, but has only 3 data tuples, expected
+    // result is empty string.
+    testVendorClassData(Option::V6, 4491, 3, 4491, 3, "");
+
+    // Case 6: Expression looks for vendor-id 4491, data[3], there is
+    // vendor-class with vendor-id 4491 and 5 data tuples, expected result is
+    // content of that tuple ("gamma")
+    testVendorClassData(Option::V6, 4491, 3, 4491, 5, "gamma");
+
+    // Check if the logged messages are correct.
+    addString("EVAL_DEBUG_VENDOR_CLASS_NO_OPTION Option with code 16 missing, "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 3, "
+              "but option with enterprise-id 4491 has only 0 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH Was looking for "
+              "4491, option had 1234, pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND Requested data index 3, "
+              "but option with enterprise-id 4491 has only 3 data tuple(s), "
+              "pushing result ''");
+    addString("EVAL_DEBUG_VENDOR_CLASS_DATA Data 3 (out of 5 received) in vendor"
+              " class found, pushing result 'gamma'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that the existing RAI -sunoption can be found.
+TEST_F(TokenTest, subOption) {
+
+    // Insert relay option with sub-options 1 and 13
+    insertRelay4Option();
+
+    // Creating the token should be safe.
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                13, TokenOption::TEXTUAL)));
+
+    // We should be able to evaluate it.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have one value on the stack
+    ASSERT_EQ(1, values_.size());
+
+    // The option should be found and option[82].option[13] should evaluate
+    // to thecontent of that sub-option, i.e. "thirteen"
+    EXPECT_EQ("thirteen", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 13 with value 'thirteen'");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that the code properly handles cases when
+// there is a RAI option, but there's no requested sub-option.
+TEST_F(TokenTest, subOptionNoSubOption) {
+
+    // Insert relay option with sub-options 1 and 13
+    insertRelay4Option();
+
+
+    // Creating the token should be safe.
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                15, TokenOption::TEXTUAL)));
+
+    // We should be able to evaluate it.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have one value on the stack
+    ASSERT_EQ(1, values_.size());
+
+    // The option should NOT be found (there is no sub-option 15),
+    // so the expression should evaluate to ""
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 15 with value ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that the code properly handles cases when
+// there's no RAI option at all.
+TEST_F(TokenTest, subOptionNoOption) {
+
+    // We didn't call insertRelay4Option(), so there's no RAI option.
+
+    // Creating the token should be safe.
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                13, TokenOption::TEXTUAL)));
+
+    // We should be able to evaluate it.
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+
+    // we should have one value on the stack
+    ASSERT_EQ(1, values_.size());
+
+    // The option should NOT be found (there is no option 82),
+    // so the expression should evaluate to ""
+    EXPECT_EQ("", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUB_OPTION_NO_OPTION Requested option 82 "
+              "sub-option 13, but the parent option is not present, "
+              "pushing result ''");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test checks that only the requested parent is searched for
+// the requested sub-option.
+TEST_F(TokenTest, subOptionOptionOnly) {
+
+    // Insert relay option with sub-options 1 and 13
+    insertRelay4Option();
+
+    // Add options 13 and 70 to the packet.
+    OptionPtr opt13(new OptionString(Option::V4, 13, "THIRTEEN"));
+    OptionPtr opt70(new OptionString(Option::V4, 70, "SEVENTY"));
+    pkt4_->addOption(opt13);
+    pkt4_->addOption(opt70);
+
+    // The situation is as follows:
+    // Packet:
+    //  - option 13 (containing "THIRTEEN")
+    //  - option 82 (rai)
+    //      - option 1 (containing "one")
+    //      - option 13 (containing "thirteen")
+
+    // Let's try to get option 13. It should get the one from RAI
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                13, TokenOption::TEXTUAL)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("thirteen", values_.top());
+
+    // Try to get option 1. It should get the one from RAI
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                1, TokenOption::TEXTUAL)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("one", values_.top());
+
+    // Try to get option 70. It should fail, as there's no such
+    // sub option in RAI.
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                70, TokenOption::TEXTUAL)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("", values_.top());
+
+    // Try to check option 1. It should return "true"
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                1, TokenOption::EXISTS)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("true", values_.top());
+
+    // Try to check option 70. It should return "false"
+    clearStack();
+    ASSERT_NO_THROW(t_.reset(new TokenSubOption(DHO_DHCP_AGENT_OPTIONS,
+                                                70, TokenOption::EXISTS)));
+    EXPECT_NO_THROW(t_->evaluate(*pkt4_, values_));
+    ASSERT_EQ(1, values_.size());
+    EXPECT_EQ("false", values_.top());
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 13 with value 'thirteen'");
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 1 with value 'one'");
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 70 with value ''");
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 1 with value 'true'");
+    addString("EVAL_DEBUG_SUB_OPTION Pushing option 82 "
+              "sub-option 70 with value 'false'");
+    EXPECT_TRUE(checkFile());
+}
+
+// Checks if various values can be represented as integer tokens
+TEST_F(TokenTest, integer) {
+    testInteger(encode(0), 0);
+    testInteger(encode(6), 6);
+    testInteger(encode(255), 255);
+    testInteger(encode(256), 256);
+    testInteger(encode(1410), 1410);
+    testInteger(encode(4294967295), 4294967295);
+}
+
+// Verify TokenSplit::eval, single delimiter.
+TEST_F(TokenTest, split) {
+    // Get the whole string
+    std::string input(".two.three..five.");
+    std::string delims(".");
+
+    // Empty input string should yield empty result.
+    verifySplitEval("", delims, "1", "");
+
+    // Empty delimiters string should yield original string result.
+    verifySplitEval(input, "", "1", input);
+
+    // Field number less than one should yield empty result.
+    verifySplitEval(input, delims, "0", "");
+
+    // Now get each field in succession.
+    verifySplitEval(input, delims, "1", "");
+    verifySplitEval(input, delims, "2", "two");
+    verifySplitEval(input, delims, "3", "three");
+    verifySplitEval(input, delims, "4", "");
+    verifySplitEval(input, delims, "5", "five");
+    verifySplitEval(input, delims, "6", "");
+
+    // Too large of a field should yield empty result.
+    verifySplitEval(input, delims, "7", "");
+
+    // A string without delimiters returns as field 1.
+    verifySplitEval("just_one", delims, "1", "just_one");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+    addString("EVAL_DEBUG_SPLIT_EMPTY Popping field 1, delimiters .,"
+              " string , pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT_DELIM_EMPTY Popping field 1, delimiters ,"
+              " string .two.three..five., pushing result 0x2E74776F2E74687265652E2E666976652E");
+    addString("EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE Popping field 0, delimiters .,"
+              " string .two.three..five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 1, delimiters .,"
+              " string .two.three..five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 2, delimiters .,"
+              " string .two.three..five., pushing result 0x74776F");
+    addString("EVAL_DEBUG_SPLIT Popping field 3, delimiters .,"
+              " string .two.three..five., pushing result 0x7468726565");
+    addString("EVAL_DEBUG_SPLIT Popping field 4, delimiters .,"
+              " string .two.three..five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 5, delimiters .,"
+              " string .two.three..five., pushing result 0x66697665");
+    addString("EVAL_DEBUG_SPLIT Popping field 6, delimiters .,"
+              " string .two.three..five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE Popping field 7, delimiters .,"
+              " string .two.three..five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 1, delimiters .,"
+              " string just_one, pushing result 0x6A7573745F6F6E65");
+    EXPECT_TRUE(checkFile());
+}
+
+// Verify TokenSplit::eval with more than one delimiter.
+TEST_F(TokenTest, splitMultipleDelims) {
+    // Get the whole string
+    std::string input(".two:three.:five.");
+    std::string delims(".:");
+
+    // Empty input string should yield empty result.
+    verifySplitEval("", delims, "1", "");
+
+    // Too small of a field should yield empty result.
+    verifySplitEval(input, delims, "0", "");
+
+    // Now get each field in succession.
+    verifySplitEval(input, delims, "1", "");
+    verifySplitEval(input, delims, "2", "two");
+    verifySplitEval(input, delims, "3", "three");
+    verifySplitEval(input, delims, "4", "");
+    verifySplitEval(input, delims, "5", "five");
+    verifySplitEval(input, delims, "6", "");
+
+    // Too large of a field should yield empty result.
+    verifySplitEval(input, delims, "7", "");
+
+    // A string without delimiters returns as field 1.
+    verifySplitEval("just_one", delims, "1", "just_one");
+
+    // Check that the debug output was correct.  Add the strings
+    // to the test vector in the class and then call checkFile
+    // for comparison
+
+    addString("EVAL_DEBUG_SPLIT_EMPTY Popping field 1, delimiters .:,"
+              " string , pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE Popping field 0, delimiters .:,"
+              " string .two:three.:five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 1, delimiters .:,"
+              " string .two:three.:five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 2, delimiters .:,"
+              " string .two:three.:five., pushing result 0x74776F");
+    addString("EVAL_DEBUG_SPLIT Popping field 3, delimiters .:,"
+              " string .two:three.:five., pushing result 0x7468726565");
+    addString("EVAL_DEBUG_SPLIT Popping field 4, delimiters .:,"
+              " string .two:three.:five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 5, delimiters .:,"
+              " string .two:three.:five., pushing result 0x66697665");
+    addString("EVAL_DEBUG_SPLIT Popping field 6, delimiters .:,"
+              " string .two:three.:five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE Popping field 7, delimiters .:,"
+              " string .two:three.:five., pushing result 0x");
+    addString("EVAL_DEBUG_SPLIT Popping field 1, delimiters .:,"
+              " string just_one, pushing result 0x6A7573745F6F6E65");
+    EXPECT_TRUE(checkFile());
+}
+
+};
diff --git a/src/lib/eval/token.cc b/src/lib/eval/token.cc
new file mode 100644
index 0000000..017f22d
--- /dev/null
+++ b/src/lib/eval/token.cc
@@ -0,0 +1,1319 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <eval/token.h>
+#include <eval/eval_log.h>
+#include <eval/eval_context.h>
+#include <util/encode/hex.h>
+#include <util/io_utilities.h>
+#include <asiolink/io_address.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <boost/lexical_cast.hpp>
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option_vendor.h>
+#include <dhcp/option_vendor_class.h>
+
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/split.hpp>
+
+#include <cstring>
+#include <string>
+#include <iomanip>
+#include <sstream>
+
+using namespace isc::asiolink;
+using namespace isc::dhcp;
+using namespace isc::util;
+using namespace std;
+
+using isc::util::encode::toHex;
+
+void
+TokenString::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    // Literals only push, nothing to pop
+    values.push(value_);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_STRING)
+        .arg('\'' + value_ + '\'');
+}
+
+TokenHexString::TokenHexString(const string& str) : value_("") {
+    // Check string starts "0x" or "0x" and has at least one additional character.
+    if ((str.size() < 3) ||
+        (str[0] != '0') ||
+        ((str[1] != 'x') && (str[1] != 'X'))) {
+        return;
+    }
+    string digits = str.substr(2);
+
+    // Transform string of hexadecimal digits into binary format
+    vector<uint8_t> binary;
+    try {
+        // The decodeHex function expects that the string contains an
+        // even number of digits. If we don't meet this requirement,
+        // we have to insert a leading 0.
+        if ((digits.length() % 2) != 0) {
+            digits = digits.insert(0, "0");
+        }
+        util::encode::decodeHex(digits, binary);
+    } catch (...) {
+        return;
+    }
+
+    // Convert to a string (note that binary.size() cannot be 0)
+    value_.resize(binary.size());
+    memmove(&value_[0], &binary[0], binary.size());
+}
+
+void
+TokenHexString::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    // Literals only push, nothing to pop
+    values.push(value_);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_HEXSTRING)
+        .arg(toHex(value_));
+}
+
+TokenIpAddress::TokenIpAddress(const string& addr) : value_("") {
+    // Transform IP address into binary format
+    vector<uint8_t> binary;
+    try {
+        asiolink::IOAddress ip(addr);
+        binary = ip.toBytes();
+    } catch (...) {
+        return;
+    }
+
+    // Convert to a string (note that binary.size() is 4 or 16, so not 0)
+    value_.resize(binary.size());
+    memmove(&value_[0], &binary[0], binary.size());
+}
+
+void
+TokenIpAddress::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    // Literals only push, nothing to pop
+    values.push(value_);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_IPADDRESS)
+        .arg(toHex(value_));
+}
+
+void
+TokenIpAddressToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if ((size != V4ADDRESS_LEN) && (size != V6ADDRESS_LEN)) {
+        isc_throw(EvalTypeError, "Can not convert to valid address.");
+    }
+
+    std::vector<uint8_t> binary(op.begin(), op.end());
+
+    if (size == V4ADDRESS_LEN) {
+        op = asiolink::IOAddress::fromBytes(AF_INET, binary.data()).toText();
+    } else {
+        op = asiolink::IOAddress::fromBytes(AF_INET6, binary.data()).toText();
+    }
+
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_IPADDRESSTOTEXT)
+        .arg(op);
+}
+
+void
+TokenInt8ToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if (size != sizeof(int8_t)) {
+        isc_throw(EvalTypeError, "Can not convert to valid int8.");
+    }
+
+    stringstream tmp;
+    tmp << static_cast<int32_t>(*(reinterpret_cast<const int8_t*>(op.data())));
+    op = tmp.str();
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_INT8TOTEXT)
+        .arg(op);
+}
+
+void
+TokenInt16ToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if (size != sizeof(int16_t)) {
+        isc_throw(EvalTypeError, "Can not convert to valid int16.");
+    }
+
+    stringstream tmp;
+    int16_t value = static_cast<int16_t>(readUint16(const_cast<const char*>(op.data()), size));
+    tmp << value;
+    op = tmp.str();
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_INT16TOTEXT)
+        .arg(op);
+}
+
+void
+TokenInt32ToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if (size != sizeof(int32_t)) {
+        isc_throw(EvalTypeError, "Can not convert to valid int32.");
+    }
+
+    stringstream tmp;
+    int32_t value = static_cast<int32_t>(readUint32(const_cast<const char*>(op.data()), size));
+    tmp << value;
+    op = tmp.str();
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_INT32TOTEXT)
+        .arg(op);
+}
+
+void
+TokenUInt8ToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if (size != sizeof(uint8_t)) {
+        isc_throw(EvalTypeError, "Can not convert to valid uint8.");
+    }
+
+    stringstream tmp;
+    tmp << static_cast<uint32_t>(*(reinterpret_cast<const uint8_t*>(op.data())));
+    op = tmp.str();
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_UINT8TOTEXT)
+        .arg(op);
+}
+
+void
+TokenUInt16ToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if (size != sizeof(uint16_t)) {
+        isc_throw(EvalTypeError, "Can not convert to valid uint16.");
+    }
+
+    stringstream tmp;
+    uint16_t value = readUint16(const_cast<const char*>(op.data()), size);
+    tmp << value;
+    op = tmp.str();
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_UINT16TOTEXT)
+        .arg(op);
+}
+
+void
+TokenUInt32ToText::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    size_t size = op.size();
+
+    if (!size) {
+        return;
+    }
+
+    values.pop();
+
+    if (size != sizeof(uint32_t)) {
+        isc_throw(EvalTypeError, "Can not convert to valid uint32.");
+    }
+
+    stringstream tmp;
+    uint32_t value = readUint32(const_cast<const char*>(op.data()), size);
+    tmp << value;
+    op = tmp.str();
+    values.push(op);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_UINT32TOTEXT)
+        .arg(op);
+}
+
+OptionPtr
+TokenOption::getOption(Pkt& pkt) {
+    return (pkt.getOption(option_code_));
+}
+
+void
+TokenOption::evaluate(Pkt& pkt, ValueStack& values) {
+    OptionPtr opt = getOption(pkt);
+    std::string opt_str;
+    if (opt) {
+        if (representation_type_ == TEXTUAL) {
+            opt_str = opt->toString();
+        } else if (representation_type_ == HEXADECIMAL) {
+            std::vector<uint8_t> binary = opt->toBinary();
+            opt_str.resize(binary.size());
+            if (!binary.empty()) {
+                memmove(&opt_str[0], &binary[0], binary.size());
+            }
+        } else {
+            opt_str = "true";
+        }
+    } else if (representation_type_ == EXISTS) {
+        opt_str = "false";
+    }
+
+    // Push value of the option or empty string if there was no such option
+    // in the packet.
+    values.push(opt_str);
+
+    // Log what we pushed, both exists and textual are simple text
+    // and can be output directly.  We also include the code number
+    // of the requested option.
+    if (representation_type_ == HEXADECIMAL) {
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_OPTION)
+            .arg(option_code_)
+            .arg(toHex(opt_str));
+    } else {
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_OPTION)
+            .arg(option_code_)
+            .arg('\'' + opt_str + '\'');
+    }
+}
+
+std::string
+TokenOption::pushFailure(ValueStack& values) {
+    std::string txt;
+    if (representation_type_ == EXISTS) {
+        txt = "false";
+    }
+    values.push(txt);
+    return (txt);
+}
+
+TokenRelay4Option::TokenRelay4Option(const uint16_t option_code,
+                                     const RepresentationType& rep_type)
+    : TokenOption(option_code, rep_type) {
+}
+
+OptionPtr TokenRelay4Option::getOption(Pkt& pkt) {
+    // Check if there is Relay Agent Option.
+    OptionPtr rai = pkt.getOption(DHO_DHCP_AGENT_OPTIONS);
+    if (!rai) {
+        return (OptionPtr());
+    }
+
+    // If there is, try to return its suboption
+    return (rai->getOption(option_code_));
+}
+
+OptionPtr TokenRelay6Option::getOption(Pkt& pkt) {
+    try {
+        // Check if it's a Pkt6.  If it's not the dynamic_cast will
+        // throw std::bad_cast.
+        Pkt6& pkt6 = dynamic_cast<Pkt6&>(pkt);
+
+        try {
+            // Now that we have the right type of packet we can
+            // get the option and return it.
+            if (nest_level_ >= 0) {
+                uint8_t nesting_level = static_cast<uint8_t>(nest_level_);
+                return(pkt6.getRelayOption(option_code_, nesting_level));
+            } else {
+                int nesting_level = pkt6.relay_info_.size() + nest_level_;
+                if (nesting_level < 0) {
+                    return (OptionPtr());
+                }
+                return(pkt6.getRelayOption(option_code_,
+                                           static_cast<uint8_t>(nesting_level)));
+            }
+        }
+        catch (const isc::OutOfRange&) {
+            // The only exception we expect is OutOfRange if the nest
+            // level is out of range of the encapsulations, for example
+            // if nest_level_ is 4 and there are only 2 encapsulations.
+            // We return a NULL in that case.
+           return (OptionPtr());
+        }
+
+    } catch (const std::bad_cast&) {
+        isc_throw(EvalTypeError, "Specified packet is not Pkt6");
+    }
+
+}
+
+void
+TokenPkt::evaluate(Pkt& pkt, ValueStack& values) {
+    string value;
+    vector<uint8_t> binary;
+    string type_str;
+    bool is_binary = true;
+    bool print_hex = true;
+    switch (type_) {
+    case IFACE:
+        is_binary = false;
+        print_hex = false;
+        value = pkt.getIface();
+        type_str = "iface";
+        break;
+    case SRC:
+        binary = pkt.getRemoteAddr().toBytes();
+        type_str = "src";
+        break;
+    case DST:
+        binary = pkt.getLocalAddr().toBytes();
+        type_str = "dst";
+        break;
+    case LEN:
+        // len() returns a size_t but in fact it can't be very large
+        // (with UDP transport it fits in 16 bits)
+        // the len() method is not const because of DHCPv6 relays.
+        // We assume here it has no bad side effects...
+        value = EvalContext::fromUint32(static_cast<uint32_t>(const_cast<Pkt&>(pkt).len()));
+        is_binary = false;
+        type_str = "len";
+        break;
+
+    default:
+        isc_throw(EvalTypeError, "Bad meta data specified: " << static_cast<int>(type_));
+    }
+
+    if (is_binary) {
+        value.resize(binary.size());
+        if (!binary.empty()) {
+            memmove(&value[0], &binary[0], binary.size());
+        }
+    }
+    values.push(value);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_PKT)
+        .arg(type_str)
+        .arg(print_hex ? toHex(value) : value);
+}
+
+void
+TokenPkt4::evaluate(Pkt& pkt, ValueStack& values) {
+    vector<uint8_t> binary;
+    string value;
+    string type_str;
+    try {
+        // Check if it's a Pkt4. If it's not, the dynamic_cast will throw
+        // std::bad_cast (failed dynamic_cast returns NULL for pointers and
+        // throws for references).
+        const Pkt4& pkt4 = dynamic_cast<const Pkt4&>(pkt);
+
+        switch (type_) {
+        case CHADDR: {
+            HWAddrPtr hwaddr = pkt4.getHWAddr();
+            if (!hwaddr) {
+                // This should never happen. Every Pkt4 should always have
+                // a hardware address.
+                isc_throw(EvalTypeError,
+                          "Packet does not have hardware address");
+            }
+            binary = hwaddr->hwaddr_;
+            type_str = "mac";
+            break;
+        }
+        case GIADDR:
+            binary = pkt4.getGiaddr().toBytes();
+            type_str = "giaddr";
+            break;
+        case CIADDR:
+            binary = pkt4.getCiaddr().toBytes();
+            type_str = "ciaddr";
+            break;
+        case YIADDR:
+            binary = pkt4.getYiaddr().toBytes();
+            type_str = "yiaddr";
+            break;
+        case SIADDR:
+            binary = pkt4.getSiaddr().toBytes();
+            type_str = "siaddr";
+            break;
+        case HLEN:
+            // Pad the uint8_t field to 4 bytes.
+            value = EvalContext::fromUint32(pkt4.getHlen());
+            type_str = "hlen";
+            break;
+        case HTYPE:
+            // Pad the uint8_t field to 4 bytes.
+            value = EvalContext::fromUint32(pkt4.getHtype());
+            type_str = "htype";
+            break;
+        case MSGTYPE:
+            value = EvalContext::fromUint32(pkt4.getType());
+            type_str = "msgtype";
+            break;
+        case TRANSID:
+            value = EvalContext::fromUint32(pkt4.getTransid());
+            type_str = "transid";
+            break;
+        default:
+            isc_throw(EvalTypeError, "Bad field specified: " << static_cast<int>(type_));
+        }
+
+    } catch (const std::bad_cast&) {
+        isc_throw(EvalTypeError, "Specified packet is not a Pkt4");
+    }
+
+    if (!binary.empty()) {
+        value.resize(binary.size());
+        memmove(&value[0], &binary[0], binary.size());
+    }
+    values.push(value);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_PKT4)
+        .arg(type_str)
+        .arg(toHex(value));
+}
+
+void
+TokenPkt6::evaluate(Pkt& pkt, ValueStack& values) {
+    string value;
+    string type_str;
+    try {
+      // Check if it's a Pkt6.  If it's not the dynamic_cast will throw
+      // std::bad_cast (failed dynamic_cast returns NULL for pointers and
+      // throws for references).
+      const Pkt6& pkt6 = dynamic_cast<const Pkt6&>(pkt);
+
+      switch (type_) {
+      case MSGTYPE: {
+          // msg type is an uint8_t integer.  We want a 4 byte string so 0 pad.
+          value = EvalContext::fromUint32(pkt6.getType());
+          type_str = "msgtype";
+          break;
+      }
+      case TRANSID: {
+          // transaction id is an uint32_t integer.  We want a 4 byte string so copy
+          value = EvalContext::fromUint32(pkt6.getTransid());
+          type_str = "transid";
+          break;
+      }
+      default:
+          isc_throw(EvalTypeError, "Bad field specified: " << static_cast<int>(type_));
+      }
+
+    } catch (const std::bad_cast&) {
+        isc_throw(EvalTypeError, "Specified packet is not Pkt6");
+    }
+
+    values.push(value);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_PKT6)
+        .arg(type_str)
+        .arg(toHex(value));
+}
+
+void
+TokenRelay6Field::evaluate(Pkt& pkt, ValueStack& values) {
+    vector<uint8_t> binary;
+    string type_str;
+    try {
+        // Check if it's a Pkt6.  If it's not the dynamic_cast will
+        // throw std::bad_cast.
+        const Pkt6& pkt6 = dynamic_cast<const Pkt6&>(pkt);
+        uint8_t relay_level;
+
+        try {
+            if (nest_level_ >= 0) {
+                relay_level = static_cast<uint8_t>(nest_level_);
+            } else {
+                int nesting_level = pkt6.relay_info_.size() + nest_level_;
+                if (nesting_level < 0) {
+                    // Don't throw OutOfRange here
+                    nesting_level = 32;
+                }
+                relay_level = static_cast<uint8_t>(nesting_level);
+            }
+            switch (type_) {
+            // Now that we have the right type of packet we can
+            // get the option and return it.
+            case LINKADDR:
+                type_str = "linkaddr";
+                binary = pkt6.getRelay6LinkAddress(relay_level).toBytes();
+                break;
+            case PEERADDR:
+                type_str = "peeraddr";
+                binary = pkt6.getRelay6PeerAddress(relay_level).toBytes();
+                break;
+            }
+        } catch (const isc::OutOfRange&) {
+            // The only exception we expect is OutOfRange if the nest
+            // level is invalid.  We push "" in that case.
+            values.push("");
+            // Log what we pushed
+            LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_RELAY6_RANGE)
+              .arg(type_str)
+              .arg(int(nest_level_))
+              .arg("0x");
+            return;
+        }
+    } catch (const std::bad_cast&) {
+        isc_throw(EvalTypeError, "Specified packet is not Pkt6");
+    }
+
+    string value;
+    value.resize(binary.size());
+    if (!binary.empty()) {
+        memmove(&value[0], &binary[0], binary.size());
+    }
+    values.push(value);
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_RELAY6)
+        .arg(type_str)
+        .arg(int(nest_level_))
+        .arg(toHex(value));
+}
+
+void
+TokenEqual::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 2) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "2 values for == operator, got " << values.size());
+    }
+
+    string op1 = values.top();
+    values.pop();
+    string op2 = values.top();
+    values.pop(); // Dammit, std::stack interface is awkward.
+
+    if (op1 == op2)
+        values.push("true");
+    else
+        values.push("false");
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_EQUAL)
+        .arg(toHex(op1))
+        .arg(toHex(op2))
+        .arg('\'' + values.top() + '\'');
+}
+
+void
+TokenSubstring::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 3) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "3 values for substring operator, got " << values.size());
+    }
+
+    string len_str = values.top();
+    values.pop();
+    string start_str = values.top();
+    values.pop();
+    string string_str = values.top();
+    values.pop();
+
+    // If we have no string to start with we push an empty string and leave
+    if (string_str.empty()) {
+        values.push("");
+
+        // Log what we popped and pushed
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SUBSTRING_EMPTY)
+            .arg(len_str)
+            .arg(start_str)
+            .arg("0x")
+            .arg("0x");
+        return;
+    }
+
+    // Convert the starting position and length from strings to numbers
+    // the length may also be "all" in which case simply make it the
+    // length of the string.
+    // If we have a problem push an empty string and leave
+    int start_pos;
+    int length;
+    try {
+        start_pos = boost::lexical_cast<int>(start_str);
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(EvalTypeError, "the parameter '" << start_str
+                  << "' for the starting position of the substring "
+                  << "couldn't be converted to an integer.");
+    }
+    try {
+        if (len_str == "all") {
+            length = string_str.length();
+        } else {
+            length = boost::lexical_cast<int>(len_str);
+        }
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(EvalTypeError, "the parameter '" << len_str
+                  << "' for the length of the substring "
+                  << "couldn't be converted to an integer.");
+    }
+
+    const int string_length = string_str.length();
+    // If the starting position is outside of the string push an
+    // empty string and leave
+    if ((start_pos < -string_length) || (start_pos >= string_length)) {
+        values.push("");
+
+        // Log what we popped and pushed
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SUBSTRING_RANGE)
+            .arg(len_str)
+            .arg(start_str)
+            .arg(toHex(string_str))
+            .arg("0x");
+        return;
+    }
+
+    // Adjust the values to be something for substr.  We first figure out
+    // the starting position, then update it and the length to get the
+    // characters before or after it depending on the sign of length
+    if (start_pos < 0) {
+        start_pos = string_length + start_pos;
+    }
+
+    if (length < 0) {
+        length = -length;
+        if (length <=  start_pos){
+            start_pos -= length;
+        } else {
+            length = start_pos;
+            start_pos = 0;
+        }
+    }
+
+    // and finally get the substring
+    values.push(string_str.substr(start_pos, length));
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SUBSTRING)
+        .arg(len_str)
+        .arg(start_str)
+        .arg(toHex(string_str))
+        .arg(toHex(values.top()));
+}
+
+void
+TokenSplit::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 3) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "3 values for split operator, got " << values.size());
+    }
+
+    // Pop the parameters.
+    string field_str = values.top();
+    values.pop();
+    string delim_str = values.top();
+    values.pop();
+    string string_str = values.top();
+    values.pop();
+
+    // If we have no string to start with we push an empty string and leave
+    if (string_str.empty()) {
+        values.push("");
+
+        // Log what we popped and pushed
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SPLIT_EMPTY)
+            .arg(field_str)
+            .arg(delim_str)
+            .arg(string_str)
+            .arg("0x");
+        return;
+    }
+
+    // Convert the field position from string to number
+    // If we have a problem push an empty string and leave
+    int field;
+    try {
+        field = boost::lexical_cast<int>(field_str);
+    } catch (const boost::bad_lexical_cast&) {
+        isc_throw(EvalTypeError, "the parameter '" << field_str
+                  << "' for the field field for split "
+                  << "couldn't be converted to an integer.");
+    }
+
+    // If we have no delimiter to start with we push the input string and leave
+    if (delim_str.empty()) {
+        values.push(string_str);
+
+        // Log what we popped and pushed
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SPLIT_DELIM_EMPTY)
+            .arg(field_str)
+            .arg(delim_str)
+            .arg(string_str)
+            .arg(toHex(values.top()));
+        return;
+    }
+
+    // Split the string into fields.
+    std::vector<std::string> fields;
+    boost::split(fields, string_str, boost::is_any_of(delim_str),
+                 boost::algorithm::token_compress_off);
+
+    // Range check the field.
+    if (field < 1 || field > fields.size()) {
+        // Push an empty string if field is out of range.
+        values.push("");
+
+        // Log what we popped and pushed
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SPLIT_FIELD_OUT_OF_RANGE)
+            .arg(field_str)
+            .arg(delim_str)
+            .arg(string_str)
+            .arg("0x");
+        return;
+    }
+
+    // Push the desired field.
+    values.push(fields[field - 1]);
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_SPLIT)
+            .arg(field_str)
+            .arg(delim_str)
+            .arg(string_str)
+            .arg(toHex(values.top()));
+}
+
+void
+TokenConcat::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 2) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "2 values for concat, got " << values.size());
+    }
+
+    string op1 = values.top();
+    values.pop();
+    string op2 = values.top();
+    values.pop(); // Dammit, std::stack interface is awkward.
+
+    // The top of the stack was evaluated last so this is the right order
+    values.push(op2 + op1);
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_CONCAT)
+        .arg(toHex(op1))
+        .arg(toHex(op2))
+        .arg(toHex(values.top()));
+}
+
+void
+TokenIfElse::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 3) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "3 values for ifelse, got " << values.size());
+    }
+
+    string iffalse = values.top();
+    values.pop();
+    string iftrue = values.top();
+    values.pop();
+    string cond = values.top();
+    values.pop();
+    bool val = toBool(cond);
+
+    if (val) {
+        values.push(iftrue);
+    } else {
+        values.push(iffalse);
+    }
+
+    // Log what we popped and pushed
+    if (val) {
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_IFELSE_TRUE)
+            .arg('\'' + cond + '\'')
+            .arg(toHex(iffalse))
+            .arg(toHex(iftrue));
+    } else {
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_IFELSE_FALSE)
+            .arg('\'' +cond + '\'')
+            .arg(toHex(iftrue))
+            .arg(toHex(iffalse));
+    }
+}
+
+void
+TokenToHexString::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 2) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "2 values for hexstring, got " << values.size());
+    }
+
+    string separator = values.top();
+    values.pop();
+    string binary = values.top();
+    values.pop();
+
+    bool first = true;
+    stringstream tmp;
+    tmp << hex;
+    for (size_t i = 0; i < binary.size(); ++i) {
+        if (!first) {
+            tmp << separator;
+        } else {
+            first = false;
+        }
+        tmp << setw(2) << setfill('0')
+            << (static_cast<unsigned>(binary[i]) & 0xff);
+    }
+    values.push(tmp.str());
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_TOHEXSTRING)
+        .arg(toHex(binary))
+        .arg(separator)
+        .arg(tmp.str());
+}
+
+void
+TokenNot::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() == 0) {
+        isc_throw(EvalBadStack, "Incorrect empty stack.");
+    }
+
+    string op = values.top();
+    values.pop();
+    bool val = toBool(op);
+
+    if (!val) {
+        values.push("true");
+    } else {
+        values.push("false");
+    }
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_NOT)
+        .arg('\'' + op + '\'')
+        .arg('\'' + values.top() + '\'');
+}
+
+void
+TokenAnd::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 2) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "2 values for and operator, got " << values.size());
+    }
+
+    string op1 = values.top();
+    values.pop();
+    bool val1 = toBool(op1);
+    string op2 = values.top();
+    values.pop(); // Dammit, std::stack interface is awkward.
+    bool val2 = toBool(op2);
+
+    if (val1 && val2) {
+        values.push("true");
+    } else {
+        values.push("false");
+    }
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_AND)
+        .arg('\'' + op1 + '\'')
+        .arg('\'' + op2 + '\'')
+        .arg('\'' + values.top() + '\'');
+}
+
+void
+TokenOr::evaluate(Pkt& /*pkt*/, ValueStack& values) {
+    if (values.size() < 2) {
+        isc_throw(EvalBadStack, "Incorrect stack order. Expected at least "
+                  "2 values for or operator, got " << values.size());
+    }
+
+    string op1 = values.top();
+    values.pop();
+    bool val1 = toBool(op1);
+    string op2 = values.top();
+    values.pop(); // Dammit, std::stack interface is awkward.
+    bool val2 = toBool(op2);
+
+    if (val1 || val2) {
+        values.push("true");
+    } else {
+        values.push("false");
+    }
+
+    // Log what we popped and pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_OR)
+        .arg('\'' + op1 + '\'')
+        .arg('\'' + op2 + '\'')
+        .arg('\'' + values.top() + '\'');
+}
+
+void
+TokenMember::evaluate(Pkt& pkt, ValueStack& values) {
+    if (pkt.inClass(client_class_)) {
+        values.push("true");
+    } else {
+        values.push("false");
+    }
+
+    // Log what we pushed
+    LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_MEMBER)
+        .arg(client_class_)
+        .arg('\'' + values.top() + '\'');
+}
+
+TokenVendor::TokenVendor(Option::Universe u, uint32_t vendor_id, RepresentationType repr,
+                         uint16_t option_code)
+    : TokenOption(option_code, repr), universe_(u), vendor_id_(vendor_id),
+      field_(option_code ? SUBOPTION : EXISTS) {
+}
+
+TokenVendor::TokenVendor(Option::Universe u, uint32_t vendor_id, FieldType field)
+    : TokenOption(0, TokenOption::HEXADECIMAL), universe_(u), vendor_id_(vendor_id),
+      field_(field) {
+    if (field_ == EXISTS) {
+        representation_type_ = TokenOption::EXISTS;
+    }
+}
+
+uint32_t TokenVendor::getVendorId() const {
+    return (vendor_id_);
+}
+
+TokenVendor::FieldType TokenVendor::getField() const {
+    return (field_);
+}
+
+void TokenVendor::evaluate(Pkt& pkt, ValueStack& values) {
+    // Get the option first.
+    uint16_t code = 0;
+    switch (universe_) {
+    case Option::V4:
+        code = DHO_VIVSO_SUBOPTIONS;
+        break;
+    case Option::V6:
+        code = D6O_VENDOR_OPTS;
+        break;
+    }
+
+    OptionPtr opt = pkt.getOption(code);
+    OptionVendorPtr vendor = boost::dynamic_pointer_cast<OptionVendor>(opt);
+    if (!vendor) {
+        // There's no vendor option, give up.
+        std::string txt = pushFailure(values);
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_NO_OPTION)
+            .arg(code)
+            .arg(txt);
+        return;
+    }
+
+    if (vendor_id_ && (vendor_id_ != vendor->getVendorId())) {
+        // There is vendor option, but it has other vendor-id value
+        // than we're looking for. (0 means accept any vendor-id)
+        std::string txt = pushFailure(values);
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_ENTERPRISE_ID_MISMATCH)
+            .arg(vendor_id_)
+            .arg(vendor->getVendorId())
+            .arg(txt);
+        return;
+    }
+
+    switch (field_) {
+    case ENTERPRISE_ID:
+    {
+        // Extract enterprise-id
+        string txt(sizeof(uint32_t), 0);
+        uint32_t value = htonl(vendor->getVendorId());
+        memcpy(&txt[0], &value, sizeof(uint32_t));
+        values.push(txt);
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_ENTERPRISE_ID)
+            .arg(vendor->getVendorId())
+            .arg(util::encode::encodeHex(std::vector<uint8_t>(txt.begin(),
+                                                              txt.end())));
+        return;
+    }
+    case SUBOPTION:
+        /// This is vendor[X].option[Y].exists, let's try to
+        /// extract the option
+        TokenOption::evaluate(pkt, values);
+        return;
+    case EXISTS:
+        // We already passed all the checks: the option is there and has specified
+        // enterprise-id.
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_EXISTS)
+            .arg(vendor->getVendorId())
+            .arg("true");
+        values.push("true");
+        return;
+    case DATA:
+        // This is for vendor-class option, we can skip it here.
+        isc_throw(EvalTypeError, "Field None is not valid for vendor-class");
+        return;
+    }
+}
+
+OptionPtr TokenVendor::getOption(Pkt& pkt) {
+   uint16_t code = 0;
+    switch (universe_) {
+    case Option::V4:
+        code = DHO_VIVSO_SUBOPTIONS;
+        break;
+    case Option::V6:
+        code = D6O_VENDOR_OPTS;
+        break;
+    }
+
+    OptionPtr opt = pkt.getOption(code);
+    if (!opt) {
+        // If vendor option is not found, return NULL
+        return (opt);
+    }
+
+    // If vendor option is found, try to return its
+    // encapsulated option.
+    return (opt->getOption(option_code_));
+}
+
+TokenVendorClass::TokenVendorClass(Option::Universe u, uint32_t vendor_id,
+                                   RepresentationType repr)
+    : TokenVendor(u, vendor_id, repr, 0), index_(0) {
+}
+
+TokenVendorClass::TokenVendorClass(Option::Universe u, uint32_t vendor_id,
+                                   FieldType field, uint16_t index)
+    : TokenVendor(u, vendor_id, TokenOption::HEXADECIMAL, 0), index_(index) {
+    field_ = field;
+}
+
+uint16_t TokenVendorClass::getDataIndex() const {
+    return (index_);
+}
+
+void TokenVendorClass::evaluate(Pkt& pkt, ValueStack& values) {
+    // Get the option first.
+    uint16_t code = 0;
+    switch (universe_) {
+    case Option::V4:
+        code = DHO_VIVCO_SUBOPTIONS;
+        break;
+    case Option::V6:
+        code = D6O_VENDOR_CLASS;
+        break;
+    }
+
+    OptionPtr opt = pkt.getOption(code);
+    OptionVendorClassPtr vendor = boost::dynamic_pointer_cast<OptionVendorClass>(opt);
+    if (!vendor) {
+        // There's no vendor class option, give up.
+        std::string txt = pushFailure(values);
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_CLASS_NO_OPTION)
+            .arg(code)
+            .arg(txt);
+        return;
+    }
+
+    if (vendor_id_ && (vendor_id_ != vendor->getVendorId())) {
+        // There is vendor option, but it has other vendor-id value
+        // than we're looking for. (0 means accept any vendor-id)
+        std::string txt = pushFailure(values);
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID_MISMATCH)
+            .arg(vendor_id_)
+            .arg(vendor->getVendorId())
+            .arg(txt);
+        return;
+    }
+
+    switch (field_) {
+    case ENTERPRISE_ID:
+    {
+        // Extract enterprise-id
+        string txt(sizeof(uint32_t), 0);
+        uint32_t value = htonl(vendor->getVendorId());
+        memcpy(&txt[0], &value, sizeof(uint32_t));
+        values.push(txt);
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_CLASS_ENTERPRISE_ID)
+            .arg(vendor->getVendorId())
+            .arg(util::encode::encodeHex(std::vector<uint8_t>(txt.begin(),
+                                                              txt.end())));
+        return;
+    }
+    case SUBOPTION:
+        // Extract sub-options
+        isc_throw(EvalTypeError, "Field None is not valid for vendor-class");
+        return;
+    case EXISTS:
+        // We already passed all the checks: the option is there and has specified
+        // enterprise-id.
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_CLASS_EXISTS)
+            .arg(vendor->getVendorId())
+            .arg("true");
+        values.push("true");
+        return;
+    case DATA:
+    {
+        size_t max = vendor->getTuplesNum();
+        if (index_ + 1 > max) {
+            // The index specified is out of bounds, e.g. there are only
+            // 2 tuples and index specified is 5.
+            LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_CLASS_DATA_NOT_FOUND)
+                .arg(index_)
+                .arg(vendor->getVendorId())
+                .arg(max)
+                .arg("");
+            values.push("");
+            return;
+        }
+
+        OpaqueDataTuple tuple = vendor->getTuple(index_);
+        OpaqueDataTuple::Buffer buf = tuple.getData();
+        string txt(buf.begin(), buf.end());
+
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, EVAL_DEBUG_VENDOR_CLASS_DATA)
+            .arg(index_)
+            .arg(max)
+            .arg(txt);
+
+        values.push(txt);
+        return;
+    }
+    default:
+        isc_throw(EvalTypeError, "Invalid field specified." << field_);
+    }
+}
+
+TokenInteger::TokenInteger(const uint32_t value)
+    : TokenString(EvalContext::fromUint32(value)), int_value_(value) {
+}
+
+OptionPtr
+TokenSubOption::getSubOption(const OptionPtr& parent) {
+    if (!parent) {
+        return (OptionPtr());
+    }
+    return (parent->getOption(sub_option_code_));
+}
+
+void
+TokenSubOption::evaluate(Pkt& pkt, ValueStack& values) {
+    OptionPtr parent = getOption(pkt);
+    std::string txt;
+    isc::log::MessageID msgid = EVAL_DEBUG_SUB_OPTION;
+    if (!parent) {
+        // There's no parent option, notify that.
+        msgid = EVAL_DEBUG_SUB_OPTION_NO_OPTION;
+        if (representation_type_ == EXISTS) {
+            txt = "false";
+        }
+    } else {
+        OptionPtr sub = getSubOption(parent);
+        if (!sub) {
+            // Failed to find the sub-option
+            if (representation_type_ == EXISTS) {
+                txt = "false";
+            }
+        } else {
+            if (representation_type_ == TEXTUAL) {
+                txt = sub->toString();
+            } else if (representation_type_ == HEXADECIMAL) {
+                std::vector<uint8_t> binary = sub->toBinary();
+                txt.resize(binary.size());
+                if (!binary.empty()) {
+                    memmove(&txt[0], &binary[0], binary.size());
+                }
+            } else {
+                txt = "true";
+            }
+        }
+    }
+
+    // Push value of the sub-option or empty string if there was no
+    // such parent option in the packet or sub-option in the parent.
+    values.push(txt);
+
+    // Log what we pushed, both exists and textual are simple text
+    // and can be output directly.  We also include the code numbers
+    // of the requested parent option and sub-option.
+    if (representation_type_ == HEXADECIMAL) {
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, msgid)
+            .arg(option_code_)
+            .arg(sub_option_code_)
+            .arg(toHex(txt));
+    } else {
+        LOG_DEBUG(eval_logger, EVAL_DBG_STACK, msgid)
+            .arg(option_code_)
+            .arg(sub_option_code_)
+            .arg('\'' + txt + '\'');
+    }
+}
diff --git a/src/lib/eval/token.h b/src/lib/eval/token.h
new file mode 100644
index 0000000..83833af
--- /dev/null
+++ b/src/lib/eval/token.h
@@ -0,0 +1,1300 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef TOKEN_H
+#define TOKEN_H
+
+#include <exceptions/exceptions.h>
+#include <dhcp/pkt.h>
+#include <stack>
+
+namespace isc {
+namespace dhcp {
+
+class Token;
+
+/// @brief Pointer to a single Token
+typedef boost::shared_ptr<Token> TokenPtr;
+
+/// This is a structure that holds an expression converted to RPN
+///
+/// For example expression: option[123].text == 'foo' will be converted to:
+/// [0] = option[123].text (TokenOption object)
+/// [1] = 'foo' (TokenString object)
+/// [2] = == operator (TokenEqual object)
+typedef std::vector<TokenPtr> Expression;
+
+typedef boost::shared_ptr<Expression> ExpressionPtr;
+
+/// Evaluated values are stored as a stack of strings
+typedef std::stack<std::string> ValueStack;
+
+/// @brief EvalBadStack is thrown when more or less parameters are on the
+///        stack than expected.
+class EvalBadStack : public Exception {
+public:
+    EvalBadStack(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief EvalTypeError is thrown when a value on the stack has a content
+///        with an unexpected type.
+class EvalTypeError : public Exception {
+public:
+    EvalTypeError(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+
+/// @brief Base class for all tokens
+///
+/// It provides an interface for all tokens and storage for string representation
+/// (all tokens evaluate to string).
+///
+/// This class represents a single token. Examples of a token are:
+/// - "foo" (a constant string)
+/// - option[123].text (a token that extracts textual value of option 123)
+/// - == (an operator that compares two other tokens)
+/// - substring(a,b,c) (an operator that takes three arguments: a string,
+///   first character and length)
+class Token {
+public:
+
+    /// @brief This is a generic method for evaluating a packet.
+    ///
+    /// We need to pass the packet being evaluated and possibly previously
+    /// evaluated values. Specific implementations may ignore the packet altogether
+    /// and just put their own value on the stack (constant tokens), look at the
+    /// packet and put some data extracted from it on the stack (option tokens),
+    /// or pop arguments from the stack and put back the result (operators).
+    ///
+    /// The parameters passed will be:
+    ///
+    /// @param pkt - packet being classified
+    /// @param values - stack of values with previously evaluated tokens
+    virtual void evaluate(Pkt& pkt, ValueStack& values) = 0;
+
+    /// @brief Virtual destructor
+    virtual ~Token() {}
+
+    /// @brief Coverts a (string) value to a boolean
+    ///
+    /// Only "true" and "false" are expected.
+    ///
+    /// @param value the (string) value
+    /// @return the boolean represented by the value
+    /// @throw EvalTypeError when the value is not either "true" or "false".
+    static inline bool toBool(std::string value) {
+        if (value == "true") {
+            return (true);
+        } else if (value == "false") {
+            return (false);
+        } else {
+            isc_throw(EvalTypeError, "Incorrect boolean. Expected exactly "
+                      "\"false\" or \"true\", got \"" << value << "\"");
+        }
+    }
+};
+
+/// The order where Token subtypes are declared should be:
+///  - literal terminals
+///  - option & co
+///  - pkt field & co
+///  - ==
+///  - substring & co
+///  - not, and, or
+
+/// @brief Token representing a constant string
+///
+/// This token holds value of a constant string, e.g. it represents
+/// "MSFT" in expression option[vendor-class].text == "MSFT"
+class TokenString : public Token {
+public:
+    /// Value is set during token construction.
+    ///
+    /// @param str constant string to be represented.
+    TokenString(const std::string& str)
+        : value_(str){
+    }
+
+    /// @brief Token evaluation (puts value of the constant string on the stack)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented string will be pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+protected:
+    std::string value_; ///< Constant value
+};
+
+/// @brief Token representing a constant string in hexadecimal format
+///
+/// This token holds value of a constant string giving in an hexadecimal
+/// format, for instance 0x666f6f is "foo"
+class TokenHexString : public Token {
+public:
+    /// Value is set during token construction.
+    ///
+    /// @param str constant string to be represented
+    /// (must be "0x" or "0X" followed by a string of hexadecimal digits
+    /// or decoding will fail)
+    TokenHexString(const std::string& str);
+
+    /// @brief Token evaluation (puts value of the constant string on
+    /// the stack after decoding or an empty string if decoding fails
+    /// (note it should not if the parser is correct)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented string will be pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+protected:
+    std::string value_; ///< Constant value
+};
+
+/// @brief Token representing an unsigned 32 bit integer
+///
+/// For performance reasons, the constant integer value is converted to a string
+/// just once (in the constructor). Afterwards, this effectively works as a constant
+/// 4 byte long string. Hence this class is derived from TokenString and
+/// does not even need its own evaluate() method.
+class TokenInteger : public TokenString {
+public:
+    /// @brief Integer value set during construction.
+    ///
+    /// The value is converted to string and stored in value_ provided by the
+    /// base class.
+    ///
+    /// @param value integer value to be stored.
+    TokenInteger(const uint32_t value);
+
+    /// @brief Returns integer value
+    ///
+    /// Used in tests only.
+    ///
+    /// @return integer value
+    uint32_t getInteger() const {
+        return (int_value_);
+    }
+
+protected:
+    uint32_t int_value_; ///< value as integer (stored for testing only)
+};
+
+/// @brief Token representing an IP address as a constant string
+///
+/// This token holds the value of an IP address as a constant string,
+/// for instance 10.0.0.1 is 0x10000001
+class TokenIpAddress : public Token {
+public:
+    /// Value is set during token construction.
+    ///
+    /// @param addr IP address to be represented as a constant string
+    TokenIpAddress(const std::string& addr);
+
+    /// @brief Token evaluation (puts value of the constant string on
+    /// the stack after decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented IP address will be pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+protected:
+    ///< Constant value (empty string if the IP address cannot be converted)
+    std::string value_;
+};
+
+/// @brief Token representing an IP address as a string
+///
+/// This token holds the value of an IP address as a string, for instance
+/// 10.0.0.1 is '10.0.0.1'
+class TokenIpAddressToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenIpAddressToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented IP address as a string will be pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token representing an 8 bit integer as a string
+///
+/// This token holds the value of an 8 bit integer as a string, for instance
+/// 0xff is '-1'
+class TokenInt8ToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenInt8ToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented 8 bit integer as a string will be pushed
+    /// here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token representing a 16 bit integer as a string
+///
+/// This token holds the value of a 16 bit integer as a string, for instance
+/// 0xffff is '-1'
+class TokenInt16ToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenInt16ToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented 16 bit integer as a string will be pushed
+    /// here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token representing a 32 bit integer as a string
+///
+/// This token holds the value of a 32 bit integer as a string, for instance
+/// 0xffffffff is '-1'
+class TokenInt32ToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenInt32ToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented 32 bit integer as a string will be pushed
+    /// here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token representing an 8 bit unsigned integer as a string
+///
+/// This token holds the value of an 8 bit unsigned integer as a string, for
+/// instance 0xff is '255'
+class TokenUInt8ToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenUInt8ToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented 8 bit unsigned integer as a string will be
+    /// pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token representing a 16 bit unsigned integer as a string
+///
+/// This token holds the value of a 16 bit unsigned integer as a string, for
+/// instance 0xffff is '65535'
+class TokenUInt16ToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenUInt16ToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented 16 bit unsigned integer as a string will be
+    /// pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token representing a 32 bit unsigned integer as a string
+///
+/// This token holds the value of a 32 bit unsigned integer as a string, for
+/// instance 0xffffffff is '4294967295'
+class TokenUInt32ToText : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenUInt32ToText() {}
+
+    /// @brief Token evaluation (puts value of the string on the stack after
+    /// decoding)
+    ///
+    /// @param pkt (ignored)
+    /// @param values (represented 32 bit unsigned integer as a string will be
+    /// pushed here)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents a value of an option
+///
+/// This represents a reference to a given option, e.g. in the expression
+/// option[vendor-class].text == "MSFT", it represents
+/// option[vendor-class].text
+///
+/// During the evaluation it tries to extract the value of the specified
+/// option. If the option is not found, an empty string ("") is returned
+/// (or "false" when the representation is EXISTS).
+class TokenOption : public Token {
+public:
+
+    /// @brief Token representation type.
+    ///
+    /// There are many possible ways in which option can be presented.
+    /// Currently the textual, hexadecimal and exists representations are
+    /// supported. The type of representation is specified in the
+    /// constructor and it affects the value generated by the
+    /// @c TokenOption::evaluate function.
+    enum RepresentationType {
+        TEXTUAL,
+        HEXADECIMAL,
+        EXISTS
+    };
+
+    /// @brief Constructor that takes an option code as a parameter
+    ///
+    /// Note: There is no constructor that takes option_name, as it would
+    /// introduce complex dependency of the libkea-eval on libdhcpsrv.
+    ///
+    /// @param option_code code of the option to be represented.
+    /// @param rep_type Token representation type.
+    TokenOption(const uint16_t option_code, const RepresentationType& rep_type)
+        : option_code_(option_code), representation_type_(rep_type) {}
+
+    /// @brief Evaluates the values of the option
+    ///
+    /// This token represents a value of the option, so this method attempts
+    /// to extract the option from the packet and put its value on the stack.
+    /// If the option is not there, an empty string ("") is put on the stack.
+    ///
+    /// @param pkt specified option will be extracted from this packet (if present)
+    /// @param values value of the option will be pushed here (or "")
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns option-code
+    ///
+    /// This method is used in testing to determine if the parser had
+    /// instantiated TokenOption with correct parameters.
+    ///
+    /// @return option-code of the option this token expects to extract.
+    uint16_t getCode() const {
+        return (option_code_);
+    }
+
+    /// @brief Returns representation-type
+    ///
+    /// This method is used in testing to determine if the parser had
+    /// instantiated TokenOption with correct parameters.
+    ///
+    /// @return representation-type of the option this token expects to use.
+    RepresentationType getRepresentation() const {
+        return (representation_type_);
+    }
+
+protected:
+    /// @brief Attempts to retrieve an option
+    ///
+    /// For this class it simply attempts to retrieve the option from the packet,
+    /// but there may be derived classes that would attempt to extract it from
+    /// other places (e.g. relay option, or as a suboption of other specific option).
+    ///
+    ///
+    /// @param pkt the option will be retrieved from here
+    /// @return option instance (or NULL if not found)
+    virtual OptionPtr getOption(Pkt& pkt);
+
+    /// @brief Auxiliary method that puts string representing a failure
+    ///
+    /// Depending on the representation type, this is either "" or "false".
+    ///
+    /// @param values a string representing failure will be pushed here.
+    /// @return value pushed
+    virtual std::string pushFailure(ValueStack& values);
+
+    uint16_t option_code_; ///< Code of the option to be extracted
+    RepresentationType representation_type_; ///< Representation type.
+};
+
+/// @brief Represents a sub-option inserted by the DHCPv4 relay.
+///
+/// DHCPv4 relays insert sub-options in option 82. This token attempts to extract
+/// such sub-options. Note in DHCPv6 it is radically different (possibly
+/// many encapsulation levels), thus there are separate classes for v4 and v6.
+///
+/// This token can represent the following expressions:
+/// relay[13].text - Textual representation of sub-option 13 in RAI (option 82)
+/// relay[13].hex  - Binary representation of sub-option 13 in RAI (option 82)
+/// relay[vendor-class].text - Text representation of sub-option X in RAI (option 82)
+/// relay[vendor-class].hex - Binary representation of sub-option X in RAI (option 82)
+class TokenRelay4Option : public TokenOption {
+public:
+
+    /// @brief Constructor for extracting sub-option from RAI (option 82)
+    ///
+    /// @param option_code code of the requested sub-option
+    /// @param rep_type code representation (currently .hex and .text are supported)
+    TokenRelay4Option(const uint16_t option_code,
+                      const RepresentationType& rep_type);
+
+protected:
+    /// @brief Attempts to obtain specified sub-option of option 82 from the packet
+    /// @param pkt DHCPv4 packet (that hopefully contains option 82)
+    /// @return found sub-option from option 82
+    virtual OptionPtr getOption(Pkt& pkt);
+};
+
+/// @brief Token that represents a value of an option within a DHCPv6 relay
+/// encapsulation
+///
+/// This represents a reference to a given option similar to TokenOption
+/// but from within the information from a relay.  In the expression
+/// relay6[nest-level].option[option-code], nest-level indicates which
+/// of the relays to examine and option-code which option to extract.
+///
+/// During the evaluation it tries to extract the value of the specified
+/// option from the requested relay block.  If the relay block doesn't
+/// exist or the option is not found an empty string ("") is returned
+/// (or "false" when the representation is EXISTS).
+///
+/// The nesting level can go from 0 (closest to the server) to 31,
+/// or from -1 (closest to the client) to -32
+class TokenRelay6Option : public TokenOption {
+public:
+    /// @brief Constructor that takes a nesting level and an option
+    /// code as parameters.
+    ///
+    /// @param nest_level the nesting for which relay to examine.
+    /// @param option_code code of the option.
+    /// @param rep_type Token representation type.
+    TokenRelay6Option(const int8_t nest_level, const uint16_t option_code,
+                      const RepresentationType& rep_type)
+        : TokenOption(option_code, rep_type), nest_level_(nest_level) {}
+
+    /// @brief Returns nest-level
+    ///
+    /// This method is used in testing to determine if the parser has
+    /// instantiated TokenRelay6Option with correct parameters.
+    ///
+    /// @return nest-level of the relay block this token expects to use
+    /// for extraction.
+    int8_t getNest() const {
+        return (nest_level_);
+    }
+
+protected:
+    /// @brief Attempts to obtain specified option from the specified relay block
+    /// @param pkt DHCPv6 packet that hopefully contains the proper relay block
+    /// @return option instance if available
+    virtual OptionPtr getOption(Pkt& pkt);
+
+    int8_t nest_level_; ///< nesting level of the relay block to use
+};
+
+/// @brief Token that represents meta data of a DHCP packet.
+///
+/// For example in the expression pkt.iface == 'eth0'
+/// this token represents the pkt.iface expression.
+///
+/// Currently supported meta datas are:
+/// - iface (incoming/outgoinginterface name)
+/// - src   (source IP address, 4 or 16 octets)
+/// - dst   (destination IP address, 4 or 16 octets)
+/// - len   (length field in the UDP header, padded to 4 octets)
+class TokenPkt : public Token {
+public:
+
+    /// @brief enum value that determines the field.
+    enum MetadataType {
+        IFACE, ///< interface name (string)
+        SRC,   ///< source (IP address)
+        DST,   ///< destination (IP address)
+        LEN    ///< length (4 octets)
+    };
+
+    /// @brief Constructor (does nothing)
+    TokenPkt(const MetadataType type)
+        : type_(type) {}
+
+    /// @brief Gets a value from the specified packet.
+    ///
+    /// Evaluation uses metadata available in the packet. It does not
+    /// require any values to be present on the stack.
+    ///
+    /// @param pkt - metadata will be extracted from here
+    /// @param values - stack of values (1 result will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns metadata type
+    ///
+    /// This method is used only in tests.
+    /// @return type of the metadata.
+    MetadataType getType() {
+        return (type_);
+    }
+
+private:
+    /// @brief Specifies metadata of the DHCP packet
+    MetadataType type_;
+};
+
+/// @brief Token that represents fields of a DHCPv4 packet.
+///
+/// For example in the expression pkt4.chaddr == 0x0102030405
+/// this token represents the pkt4.chaddr expression.
+///
+/// Currently supported fields are:
+/// - chaddr (client hardware address, hlen [0..16] octets)
+/// - giaddr (relay agent IP address, 4 octets)
+/// - ciaddr (client IP address, 4 octets)
+/// - yiaddr ('your' (client) IP address, 4 octets)
+/// - siaddr (next server IP address, 4 octets)
+/// - hlen   (hardware address length, padded to 4 octets)
+/// - htype  (hardware address type, padded to 4 octets)
+class TokenPkt4 : public Token {
+public:
+
+    /// @brief enum value that determines the field.
+    enum FieldType {
+        CHADDR, ///< chaddr field (up to 16 bytes link-layer address)
+        GIADDR, ///< giaddr (IPv4 address)
+        CIADDR, ///< ciaddr (IPv4 address)
+        YIADDR, ///< yiaddr (IPv4 address)
+        SIADDR, ///< siaddr (IPv4 address)
+        HLEN,   ///< hlen (hardware address length)
+        HTYPE,  ///< htype (hardware address type)
+        MSGTYPE, ///< message type (not really a field, content of option 53)
+        TRANSID, ///< transaction-id (xid)
+    };
+
+    /// @brief Constructor (does nothing)
+    TokenPkt4(const FieldType type)
+        : type_(type) {}
+
+    /// @brief Gets a value from the specified packet.
+    ///
+    /// Evaluation uses fields available in the packet. It does not require
+    /// any values to be present on the stack.
+    ///
+    /// @throw EvalTypeError when called for DHCPv6 packet
+    ///
+    /// @param pkt - fields will be extracted from here
+    /// @param values - stack of values (1 result will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns field type
+    ///
+    /// This method is used only in tests.
+    /// @return type of the field.
+    FieldType getType() {
+        return (type_);
+    }
+
+private:
+    /// @brief Specifies field of the DHCPv4 packet
+    FieldType type_;
+};
+
+/// @brief Token that represents fields of DHCPv6 packet.
+///
+/// For example in the expression pkt6.msgtype == 1
+/// this token represents the message type of the DHCPv6 packet.
+/// The integer values are placed on the value stack as 4 byte
+/// strings.
+///
+/// Currently supported fields are:
+/// - msgtype
+/// - transid
+class TokenPkt6 : public Token {
+public:
+    /// @brief enum value that determines the field.
+    enum FieldType {
+        MSGTYPE, ///< msg type
+        TRANSID  ///< transaction id (integer but manipulated as a string)
+    };
+
+    /// @brief Constructor (does nothing)
+    TokenPkt6(const FieldType type)
+        : type_(type) {}
+
+    /// @brief Gets a value of the specified packet.
+    ///
+    /// The evaluation uses fields that are available in the packet.  It does not
+    /// require any values to be present on the stack.
+    ///
+    /// @throw EvalTypeError when called for a DHCPv4 packet
+    ///
+    /// @param pkt - packet from which to extract the fields
+    /// @param values - stack of values, 1 result will be pushed
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns field type
+    ///
+    /// This method is used only in tests.
+    /// @return type of the field.
+    FieldType getType() {
+        return (type_);
+    }
+
+private:
+    /// @brief Specifies field of the DHCPv6 packet to get
+    FieldType type_;
+};
+
+/// @brief Token that represents a value of a field within a DHCPv6 relay
+/// encapsulation
+///
+/// This represents a reference to a field with a given DHCPv6 relay encapsulation.
+/// In the expression relay6[nest-level].field-name, nest-level indicates which of
+/// the relays to examine and field-name which of the fields to extract.
+///
+/// During the evaluation it tries to extract the value of the specified
+/// field from the requested relay block.  If the relay block doesn't exist
+/// an empty string ("") is returned.  If the relay block does exist the field
+/// is always returned as a 16 byte IPv6 address.  As the relay may not have
+/// set the field it may be 0s.
+///
+/// The nesting level can go from 0 (closest to the server) to 31,
+/// or from -1 (closest to the client) to -32
+class TokenRelay6Field : public Token {
+public:
+
+    /// @brief enum value that determines the field.
+    enum FieldType {
+        PEERADDR, ///< Peer address field (IPv6 address)
+        LINKADDR  ///< Link address field (IPv6 address)
+    };
+
+    /// @brief Constructor that takes a nesting level and field type
+    /// as parameters.
+    ///
+    /// @param nest_level the nesting level for which relay to examine.
+    /// @param type which field to extract.
+    TokenRelay6Field(const int8_t nest_level, const FieldType type)
+        : nest_level_(nest_level), type_(type) {}
+
+    /// @brief Extracts the specified field from the requested relay
+    ///
+    /// Evaluation uses fields available in the packet.  It does not require
+    /// any values to be present on the stack.
+    ///
+    /// @param pkt fields will be extracted from here
+    /// @param values - stack of values (1 result will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns nest-level
+    ///
+    /// This method is used in testing to determine if the parser has
+    /// instantiated TokenRelay6Field with correct parameters.
+    ///
+    /// @return nest-level of the relay block this token expects to use
+    /// for extraction.
+    int8_t getNest() const {
+        return (nest_level_);
+    }
+
+    /// @brief Returns field type
+    ///
+    /// This method is used only in testing to determine if the parser has
+    /// instantiated TokenRelay6Field with correct parameters.
+    ///
+    /// @return type of the field.
+    FieldType getType() {
+        return (type_);
+    }
+
+protected:
+    /// @brief Specifies field of the DHCPv6 relay option to get
+    int8_t nest_level_; ///< nesting level of the relay block to use
+    FieldType type_; ///< field to get
+};
+
+/// @brief Token that represents equality operator (compares two other tokens)
+///
+/// For example in the expression option[vendor-class].text == "MSFT"
+/// this token represents the equal (==) sign.
+class TokenEqual : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenEqual() {}
+
+    /// @brief Compare two values.
+    ///
+    /// Evaluation does not use packet information, but rather consumes the last
+    /// two parameters. It does a simple string comparison and sets the value to
+    /// either "true" or "false". It requires at least two parameters to be
+    /// present on stack.
+    ///
+    /// @throw EvalBadStack if there are less than 2 values on stack
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (2 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents the substring operator (returns a portion
+/// of the supplied string)
+///
+/// This token represents substring(str, start, len)  An operator that takes three
+/// arguments: a string, the first character and the length.
+class TokenSubstring : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenSubstring() {}
+
+    /// @brief Extract a substring from a string
+    ///
+    /// Evaluation does not use packet information.  It requires at least
+    /// three values to be present on the stack.  It will consume the top
+    /// three values on the stack as parameters and push the resulting substring
+    /// onto the stack.  From the top it expects the values on the stack as:
+    /// -  len
+    /// -  start
+    /// -  str
+    ///
+    /// str is the string to extract a substring from.  If it is empty, an empty
+    /// string is pushed onto the value stack.
+    ///
+    /// start is the position from which the code starts extracting the substring.
+    /// 0 is the first character and a negative number starts from the end, with
+    /// -1 being the last character.  If the starting point is outside of the
+    /// original string an empty string is pushed onto the value stack.
+    ///
+    /// length is the number of characters from the string to extract.
+    /// "all" means all remaining characters from start to the end of string.
+    /// A negative number means to go from start towards the beginning of
+    /// the string, but doesn't include start.
+    /// If length is longer than the remaining portion of string
+    /// then the entire remaining portion is placed on the value stack.
+    ///
+    /// The following examples all use the base string "foobar", the first number
+    /// is the starting position and the second is the length.  Note that
+    /// a negative length only selects which characters to extract it does not
+    /// indicate an attempt to reverse the string.
+    /// -  0, all => "foobar"
+    /// -  0,  6  => "foobar"
+    /// -  0,  4  => "foob"
+    /// -  2, all => "obar"
+    /// -  2,  6  => "obar"
+    /// - -1, all => "r"
+    /// - -1, -4  => "ooba"
+    ///
+    /// @throw EvalBadStack if there are less than 3 values on stack
+    /// @throw EvalTypeError if start is not a number or length a number or
+    ///        the special value "all".
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (3 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+class TokenSplit : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenSplit() {}
+
+    /// @brief Extract a field from a delimited string
+    ///
+    /// Evaluation does not use packet information.  It requires at least
+    /// three values to be present on the stack.  It will consume the top
+    /// three values on the stack as parameters and push the resulting substring
+    /// onto the stack.  From the top it expects the values on the stack as:
+    /// -  field
+    /// -  delims
+    /// -  str
+    ///
+    /// str is the string to split.  If it is empty, an empty
+    /// string is pushed onto the value stack.
+    /// delims is string of character delimiters by which to split str. If it is
+    /// empty the entire value of str will be pushed on onto the value stack.
+    /// field is the field number (starting at 1) of the desired field.  If it is
+    /// out of range an empty string is pushed on the value stack.
+    ///
+    /// The following examples all use the base string "one.two..four" and shows
+    /// the value returned for a given field:
+    /// ```
+    /// field => value
+    /// --------------
+    /// -  0  => ""
+    /// -  1  => "one"
+    /// -  2  => "two"
+    /// -  3  => ""
+    /// -  4  => "four"
+    /// -  5  => ""
+    /// ```
+    ///
+    /// @throw EvalBadStack if there are less than 3 values on stack
+    /// @throw EvalTypeError if field is not a number
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (3 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents concat operator (concatenates two other tokens)
+///
+/// For example in the sub-expression "concat('foo','bar')" the result
+/// of the evaluation is "foobar"
+/// For user convenience the "'foo' + 'bar'" alternative does the same.
+class TokenConcat : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenConcat() {}
+
+    /// @brief Concatenate two values.
+    ///
+    /// Evaluation does not use packet information, but rather consumes the last
+    /// two parameters. It does a simple string concatenation. It requires
+    /// at least two parameters to be present on stack.
+    ///
+    /// @throw EvalBadStack if there are less than 2 values on stack
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (2 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents an alternative
+///
+/// For example in the sub-expression "ifelse(cond, iftrue, iffalse)"
+/// the boolean "cond" expression is evaluated, if it is true then
+/// the "iftrue" value is returned else the "iffalse" value is returned.
+/// Please note that "iftrue" and "iffalse" must be plain string (vs. boolean)
+/// expressions and they are always evaluated. If you want a similar
+/// operator on boolean expressions it can be built from "and", "or" and
+/// "not" boolean operators.
+class TokenIfElse : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenIfElse() { }
+
+    /// @brief Alternative.
+    ///
+    /// Evaluation does not use packet information, but rather consumes the
+    /// last three results. It does a simple string comparison on the
+    /// condition (third value on the stack) which is required to be
+    /// either "true" or "false", and leaves the second and first
+    /// value if the condition is "true" or "false".
+    ///
+    /// @throw EvalBadStack if there are less than 3 values on stack
+    /// @throw EvalTypeError if the third value (the condition) is not
+    ///        either "true" or "false"
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (two items are removed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that converts to hexadecimal string
+///
+/// For example in the sub-expression "hexstring(pkt4.mac, ':')"
+/// the binary MAC address is converted to its usual hexadecimal
+/// representation as a list of (6) pairs of hexadecimal digits
+/// separated by colons (':').
+/// Please note the token is named TokenToHexString when the syntax
+/// use the hexstring name without a leading "to".
+class TokenToHexString : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenToHexString() { }
+
+    /// @brief Convert a binary value to its hexadecimal string representation
+    ///
+    /// Evaluation does not use packet information. It requires at least
+    /// two values to be present on the stack. It will consume the top
+    /// two values on the stack as parameters and push the resulting
+    /// hexadecimal string onto the stack.
+    /// From the top it expects the values on the stack as:
+    /// - separator
+    /// - binary
+    ///
+    /// binary is the binary value (note it can be any value, i.e.
+    /// it is not checked to really be not printable).
+    /// separator is literal for instance '-' or ':'. The empty separator
+    /// means no separator.
+    ///
+    /// The following example use a binary MAC address 06:ce:8f:55:b3:33:
+    /// - mac, '-' => "06-ce-8f-55-b3-33"
+    ///
+    /// @throw EvalBadStack if there are less than 2 values on stack
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (2 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents logical negation operator
+///
+/// For example in the expression "not(option[vendor-class].text == 'MSF')"
+/// this token represents the leading "not"
+class TokenNot : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenNot() {}
+
+    /// @brief Logical negation.
+    ///
+    /// Evaluation does not use packet information, but rather consumes the last
+    /// result. It does a simple string comparison and sets the value to
+    /// either "true" or "false". It requires at least one value to be
+    /// present on stack and to be either "true" or "false".
+    ///
+    /// @throw EvalBadStack if there are less than 1 value on stack
+    /// @throw EvalTypeError if the top value on the stack is not either
+    ///        "true" or "false"
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (logical top value negated)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents logical and operator
+///
+/// For example "option[10].exists and option[11].exists"
+class TokenAnd : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenAnd() {}
+
+    /// @brief Logical and.
+    ///
+    /// Evaluation does not use packet information, but rather consumes the last
+    /// two parameters. It returns "true" if and only if both are "true".
+    /// It requires at least two logical (i.e., "true" or "false') values
+    /// present on stack.
+    ///
+    /// @throw EvalBadStack if there are less than 2 values on stack
+    /// @throw EvalTypeError if one of the 2 values on stack is not
+    ///        "true" or "false"
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (2 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents logical or operator
+///
+/// For example "option[10].exists or option[11].exists"
+class TokenOr : public Token {
+public:
+    /// @brief Constructor (does nothing)
+    TokenOr() {}
+
+    /// @brief Logical or.
+    ///
+    /// Evaluation does not use packet information, but rather consumes the last
+    /// two parameters. It returns "false" if and only if both are "false".
+    /// It requires at least two logical (i.e., "true" or "false') values
+    /// present on stack.
+    ///
+    /// @throw EvalBadStack if there are less than 2 values on stack
+    /// @throw EvalTypeError if one of the 2 values on stack is not
+    ///        "true" or "false"
+    ///
+    /// @param pkt (unused)
+    /// @param values - stack of values (2 arguments will be popped, 1 result
+    ///        will be pushed)
+    void evaluate(Pkt& pkt, ValueStack& values);
+};
+
+/// @brief Token that represents client class membership
+///
+/// For example "not member('foo')" is the complement of class foo
+class TokenMember : public Token {
+public:
+    /// @brief Constructor
+    ///
+    /// @param client_class client class name
+    TokenMember(const std::string& client_class)
+        : client_class_(client_class){
+    }
+
+    /// @brief Token evaluation (check if client_class_ was added to
+    /// packet client classes)
+    ///
+    /// @param pkt the class name will be check from this packet's client classes
+    /// @param values true (if found) or false (if not found) will be pushed here
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns client class name
+    ///
+    /// This method is used in testing to determine if the parser had
+    /// instantiated TokenMember with correct parameters.
+    ///
+    /// @return client class name the token expects to check membership.
+    const ClientClass& getClientClass() const {
+        return (client_class_);
+    }
+
+protected:
+    /// @brief The client class name
+    ClientClass client_class_;
+};
+
+/// @brief Token that represents vendor options in DHCPv4 and DHCPv6.
+///
+/// It covers vendor independent vendor information option (125, DHCPv4)
+/// and vendor option (17, DHCPv6). Since both of those options may have
+/// suboptions, this class is derived from TokenOption and leverages its
+/// ability to operate on sub-options. It also adds additional capabilities.
+/// In particular, it allows retrieving enterprise-id.
+///
+/// It can represent the following expressions:
+/// vendor[4491].exists - if vendor option with enterprise-id = 4491 exists
+/// vendor[*].exists - if any vendor option exists
+/// vendor.enterprise - returns enterprise-id from vendor option
+/// vendor[4491].option[1].exists - check if suboption 1 exists for vendor 4491
+/// vendor[4491].option[1].hex - return content of suboption 1 for vendor 4491
+class TokenVendor : public TokenOption {
+public:
+
+    /// @brief Specifies a field of the vendor option
+    enum FieldType {
+        SUBOPTION,     ///< If this token fetches a suboption, not a field.
+        ENTERPRISE_ID, ///< enterprise-id field (vendor-info, vendor-class)
+        EXISTS,        ///< vendor[123].exists
+        DATA           ///< data chunk, used in derived vendor-class only
+    };
+
+    /// @brief Constructor used for accessing a field
+    ///
+    /// @param u universe (either V4 or V6)
+    /// @param vendor_id specifies enterprise-id (0 means any)
+    /// @param field specifies which field should be returned
+    TokenVendor(Option::Universe u, uint32_t vendor_id, FieldType field);
+
+
+    /// @brief Constructor used for accessing an option
+    ///
+    /// This constructor is used for accessing suboptions. In general
+    /// option_code is mandatory, except when repr is EXISTS. For
+    /// option_code = 0 and repr = EXISTS, the token will return true
+    /// if the whole option exists, not suboptions.
+    ///
+    /// @param u universe (either V4 or V6)
+    /// @param vendor_id specifies enterprise-id (0 means any)
+    /// @param repr representation type (hex or exists)
+    /// @param option_code sub-option code
+    TokenVendor(Option::Universe u, uint32_t vendor_id, RepresentationType repr,
+                uint16_t option_code = 0);
+
+    /// @brief Returns enterprise-id
+    ///
+    /// Used in tests only.
+    ///
+    /// @return enterprise-id
+    uint32_t getVendorId() const;
+
+    /// @brief Returns field.
+    ///
+    /// Used in tests only.
+    ///
+    /// @return field type.
+    FieldType getField() const;
+
+    /// @brief This is a method for evaluating a packet.
+    ///
+    /// Depending on the value of vendor_id, field type, representation and
+    /// option code, it will attempt to return specified characteristic of the
+    /// vendor option
+    ///
+    /// If vendor-id is specified, check only option with that particular
+    /// enterprise-id. If vendor-id is 0, check any vendor option, regardless
+    /// of its enterprise-id value.
+    ///
+    /// If FieldType is NONE, get specified suboption represented by option_code
+    /// and represent it as specified by repr.
+    ///
+    /// If FieldType is ENTERPRISE_ID, return value of the enterprise-id field
+    /// or "" if there's no vendor option.
+    ///
+    /// @throw EvalTypeError for any other FieldType values.
+    ///
+    /// The parameters passed are:
+    ///
+    /// @param pkt - vendor options will be searched for here.
+    /// @param values - the evaluated value will be pushed here.
+    virtual void evaluate(Pkt& pkt, ValueStack& values);
+
+protected:
+    /// @brief Attempts to get a suboption.
+    ///
+    /// This method overrides behavior of TokenOption method. It attempts to retrieve
+    /// the sub-option of the vendor option. Using derived method allows usage of
+    /// TokenOption routines.
+    ///
+    /// @param pkt vendor option will be searched here.
+    /// @return suboption of the vendor option (if exists)
+    virtual OptionPtr getOption(Pkt& pkt);
+
+    /// @brief Universe (V4 or V6)
+    ///
+    /// We need to remember it, because depending on the universe, the code needs
+    /// to retrieve either option 125 (DHCPv4) or 17 (DHCPv6).
+    Option::Universe universe_;
+
+    /// @brief Enterprise-id value
+    ///
+    /// Yeah, I know it technically should be called enterprise-id, but that's
+    /// too long and everyone calls it vendor-id.
+    uint32_t vendor_id_;
+
+    /// @brief Specifies which field should be accessed.
+    FieldType field_;
+};
+
+/// @brief Token that represents vendor class options in DHCPv4 and DHCPv6.
+///
+/// It covers vendor independent vendor information option (124, DHCPv4)
+/// and vendor option (16, DHCPv6). Contrary to vendor options, vendor class
+/// options don't have suboptions, but have data chunks (tuples) instead.
+/// Therefore they're not referenced by option codes, but by indexes.
+/// The first data chunk is data[0], the second is data[1] etc.
+///
+/// This class is derived from OptionVendor to take advantage of the
+/// enterprise handling field and field type.
+///
+/// It can represent the following expressions:
+/// vendor-class[4491].exists
+/// vendor-class[*].exists
+/// vendor-class[*].enterprise
+/// vendor-class[4491].data - content of the opaque-data of the first tuple
+/// vendor-class[4491].data[3] - content of the opaque-data of the 4th tuple
+class TokenVendorClass : public TokenVendor {
+public:
+
+    /// @brief This constructor is used to access fields.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id value of enterprise-id field (0 means any)
+    /// @param repr representation type (EXISTS or HEX)
+    TokenVendorClass(Option::Universe u, uint32_t vendor_id, RepresentationType repr);
+
+    /// @brief This constructor is used to access data chunks.
+    ///
+    /// @param u universe (V4 or V6)
+    /// @param vendor_id value of enterprise-id field (0 means any)
+    /// @param field type of the field (usually DATA or ENTERPRISE)
+    /// @param index specifies which data chunk to retrieve
+    TokenVendorClass(Option::Universe u, uint32_t vendor_id, FieldType field,
+                     uint16_t index = 0);
+
+    /// @brief Returns data index.
+    ///
+    /// Used in testing.
+    /// @return data index (specifies which data chunk to retrieve)
+    uint16_t getDataIndex() const;
+
+protected:
+
+    /// @brief This is a method for evaluating a packet.
+    ///
+    /// Depending on the value of vendor_id, field type, representation and
+    /// option code, it will attempt to return specified characteristic of the
+    /// vendor option
+    ///
+    /// If vendor-id is specified, check only option with that particular
+    /// enterprise-id. If vendor-id is 0, check any vendor option, regardless
+    /// of its enterprise-id value.
+    ///
+    /// If FieldType is ENTERPRISE_ID, return value of the enterprise-id field
+    /// or "" if there's no vendor option.
+    ///
+    /// If FieldType is DATA, get specified data chunk represented by index_.
+    ///
+    /// If FieldType is EXISTS, return true if vendor-id matches.
+    ///
+    /// @throw EvalTypeError for any other FieldType values.
+    ///
+    /// The parameters passed are:
+    ///
+    /// @param pkt - vendor options will be searched for here.
+    /// @param values - the evaluated value will be pushed here.
+    void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Data chunk index.
+    uint16_t index_;
+};
+
+/// @brief Token that represents sub-options in DHCPv4 and DHCPv6.
+///
+/// It covers any options which encapsulate sub-options, for instance
+/// dhcp-agent-options (82, DHCPv4) or rsoo (66, DHCPv6).
+/// This class is derived from TokenOption and leverages its ability
+/// to operate on sub-options. It also adds additional capabilities.
+///
+/// Note: @c TokenSubOption virtually derives @c TokenOption because both
+/// classes are inherited together in more complex classes in other parts of
+/// the code. This makes the base class @c TokenOption to exist only once in
+/// such complex classes.
+///
+/// It can represent the following expressions:
+/// option[149].exists - check if option 149 exists
+/// option[149].option[1].exists - check if suboption 1 exists in the option 149
+/// option[149].option[1].hex - return content of suboption 1 for option 149
+class TokenSubOption : public virtual TokenOption {
+public:
+
+    /// @note Does not define its own representation type:
+    /// simply use the @c TokenOption::RepresentationType
+
+    /// @brief Constructor that takes an option and sub-option codes as parameter
+    ///
+    /// Note: There is no constructor that takes names.
+    ///
+    /// @param option_code code of the parent option.
+    /// @param sub_option_code code of the sub-option to be represented.
+    /// @param rep_type Token representation type.
+    TokenSubOption(const uint16_t option_code,
+                   const uint16_t sub_option_code,
+                   const RepresentationType& rep_type)
+        : TokenOption(option_code, rep_type), sub_option_code_(sub_option_code) {}
+
+    /// @brief This is a method for evaluating a packet.
+    ///
+    /// This token represents a value of the sub-option, so this method
+    /// attempts to extract the parent option from the packet and when
+    /// it succeeds to extract the sub-option from the option and
+    /// its value on the stack.
+    /// If the parent option or the sub-option is not there, an empty
+    /// string ("") is put on the stack.
+    ///
+    /// @param pkt specified parent option will be extracted from this packet
+    /// @param values value of the sub-option will be pushed here (or "")
+    virtual void evaluate(Pkt& pkt, ValueStack& values);
+
+    /// @brief Returns sub-option-code
+    ///
+    /// This method is used in testing to determine if the parser had
+    /// instantiated TokenSubOption with correct parameters.
+    ///
+    /// @return option-code of the sub-option this token expects to extract.
+    uint16_t getSubCode() const {
+        return (sub_option_code_);
+    }
+
+protected:
+    /// @brief Attempts to retrieve a sub-option.
+    ///
+    /// @param parent the sub-option will be retrieved from here
+    /// @return sub-option instance (or NULL if not found)
+    virtual OptionPtr getSubOption(const OptionPtr& parent);
+
+    uint16_t sub_option_code_; ///< Code of the sub-option to be extracted
+};
+
+} // end of isc::dhcp namespace
+} // end of isc namespace
+
+#endif
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 12:15:43 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-13 12:15:43 +0000
commit	f5f56e1a1c4d9e9496fcb9d81131066a964ccd23 (patch)
tree	49e44c6f87febed37efb953ab5485aa49f6481a7 /src/lib/eval
parent	Initial commit. (diff)
download	isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.tar.xz isc-kea-f5f56e1a1c4d9e9496fcb9d81131066a964ccd23.zip