1 files changed, 204 insertions, 0 deletions
diff --git a/src/bin/agent/parser_context.cc b/src/bin/agent/parser_context.cc
new file mode 100644
index 0000000..7c18e03
--- /dev/null
+++ b/src/bin/agent/parser_context.cc
@@ -0,0 +1,204 @@
+// Copyright (C) 2017-2021 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 <agent/parser_context.h>
+#include <agent/agent_parser.h>
+#include <agent/ca_log.h>
+#include <exceptions/exceptions.h>
+#include <cc/dhcp_config_error.h>
+#include <cc/data.h>
+#include <fstream>
+#include <sstream>
+#include <limits>
+
+namespace isc {
+namespace agent {
+
+ParserContext::ParserContext()
+  : sfile_(0), ctx_(NO_KEYWORDS), trace_scanning_(false), trace_parsing_(false)
+{
+}
+
+ParserContext::~ParserContext()
+{
+}
+
+isc::data::ElementPtr
+ParserContext::parseString(const std::string& str, ParserType parser_type)
+{
+    scanStringBegin(str, parser_type);
+    return (parseCommon());
+}
+
+isc::data::ElementPtr
+ParserContext::parseFile(const std::string& filename, ParserType parser_type) {
+    FILE* f = fopen(filename.c_str(), "r");
+    if (!f) {
+        isc_throw(ParseError, "Unable to open file " << filename);
+    }
+    scanFileBegin(f, filename, parser_type);
+    return (parseCommon());
+}
+
+isc::data::ElementPtr
+ParserContext::parseCommon() {
+    isc::agent::AgentParser parser(*this);
+    // Uncomment this to get detailed parser logs.
+    // trace_parsing_ = true;
+    parser.set_debug_level(trace_parsing_);
+    try {
+        int res = parser.parse();
+        if (res != 0) {
+            isc_throw(ParseError, "Parser abort");
+        }
+        scanEnd();
+    }
+    catch (...) {
+        scanEnd();
+        throw;
+    }
+    if (stack_.size() == 1) {
+        return (stack_[0]);
+    } else {
+        isc_throw(ParseError, "Expected exactly one terminal Element expected, found "
+                  << stack_.size());
+    }
+}
+
+void
+ParserContext::error(const isc::agent::location& loc,
+                     const std::string& what,
+                     size_t pos)
+{
+    if (pos == 0) {
+        isc_throw(ParseError, loc << ": " << what);
+    } else {
+        isc_throw(ParseError, loc << " (near " << pos << "): " << what);
+    }
+}
+
+void
+ParserContext::error(const std::string& what)
+{
+    isc_throw(ParseError, what);
+}
+
+void
+ParserContext::fatal(const std::string& what)
+{
+    isc_throw(ParseError, what);
+}
+
+isc::data::Element::Position
+ParserContext::loc2pos(isc::agent::location& loc)
+{
+    const std::string& file = *loc.begin.filename;
+    const uint32_t line = loc.begin.line;
+    const uint32_t pos = loc.begin.column;
+    return (isc::data::Element::Position(file, line, pos));
+}
+
+void
+ParserContext::require(const std::string& name,
+                       isc::data::Element::Position open_loc,
+                       isc::data::Element::Position close_loc)
+{
+    ConstElementPtr value = stack_.back()->get(name);
+    if (!value) {
+        isc_throw(ParseError,
+                  "missing parameter '" << name << "' ("
+                  << stack_.back()->getPosition() << ") ["
+                  << contextName() << " map between "
+                  << open_loc << " and " << close_loc << "]");
+    }
+}
+
+void
+ParserContext::unique(const std::string& name,
+                      isc::data::Element::Position loc)
+{
+    ConstElementPtr value = stack_.back()->get(name);
+    if (value) {
+        if (ctx_ != NO_KEYWORDS) {
+            isc_throw(ParseError, loc << ": duplicate " << name
+                      << " entries in " << contextName()
+                      << " map (previous at " << value->getPosition() << ")");
+        } else {
+            isc_throw(ParseError, loc << ": duplicate " << name
+                      << " entries in JSON"
+                      << " map (previous at " << value->getPosition() << ")");
+        }
+    }
+}
+
+void
+ParserContext::enter(const LexerContext& ctx)
+{
+    cstack_.push_back(ctx_);
+    ctx_ = ctx;
+}
+
+void
+ParserContext::leave()
+{
+    if (cstack_.empty()) {
+        fatal("unbalanced syntactic context");
+    }
+    ctx_ = cstack_.back();
+    cstack_.pop_back();
+}
+
+const std::string
+ParserContext::contextName()
+{
+    switch (ctx_) {
+    case NO_KEYWORDS:
+        return ("__no keywords__");
+    case CONFIG:
+        return ("toplevel");
+    case AGENT:
+        return ("Control-agent");
+    case AUTHENTICATION:
+        return ("authentication");
+    case AUTH_TYPE:
+        return ("auth-type");
+    case CLIENTS:
+        return ("clients");
+    case CONTROL_SOCKETS:
+        return ("control-sockets");
+    case SERVER:
+        return ("xxx-server");
+    case SOCKET_TYPE:
+        return ("socket-type");
+    case HOOKS_LIBRARIES:
+        return ("hooks-libraries");
+    case LOGGERS:
+        return ("loggers");
+    case OUTPUT_OPTIONS:
+        return ("output-options");
+    default:
+        return ("__unknown__");
+    }
+}
+
+void
+ParserContext::warning(const isc::agent::location& loc,
+                       const std::string& what) {
+    std::ostringstream msg;
+    msg << loc << ": " << what;
+    LOG_WARN(agent_logger, CTRL_AGENT_CONFIG_SYNTAX_WARNING)
+        .arg(msg.str());
+}
+
+void
+ParserContext::warnAboutExtraCommas(const isc::agent::location& loc) {
+    warning(loc, "Extraneous comma. A piece of configuration may have been omitted.");
+}
+
+} // end of isc::eval namespace
+} // end of isc namespace