Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 273 insertions, 0 deletions

diff --git a/src/boost/libs/spirit/example/x3/calc/calc4.cpp b/src/boost/libs/spirit/example/x3/calc/calc4.cpp
new file mode 100644
index 00000000..289e2cd9
--- /dev/null
+++ b/src/boost/libs/spirit/example/x3/calc/calc4.cpp
@@ -0,0 +1,273 @@
+/*=============================================================================
+    Copyright (c) 2001-2014 Joel de Guzman
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+///////////////////////////////////////////////////////////////////////////////
+//
+//  A Calculator example demonstrating generation of AST. The AST,
+//  once created, is traversed, 1) To print its contents and
+//  2) To evaluate the result.
+//
+//  [ JDG April 28, 2008 ]      For BoostCon 2008
+//  [ JDG February 18, 2011 ]   Pure attributes. No semantic actions.
+//  [ JDG January 9, 2013 ]     Spirit X3
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <boost/config/warning_disable.hpp>
+#include <boost/spirit/home/x3.hpp>
+#include <boost/spirit/home/x3/support/ast/variant.hpp>
+#include <boost/fusion/include/adapt_struct.hpp>
+
+#include <iostream>
+#include <string>
+#include <list>
+#include <numeric>
+
+namespace x3 = boost::spirit::x3;
+
+namespace client { namespace ast
+{
+    ///////////////////////////////////////////////////////////////////////////
+    //  The AST
+    ///////////////////////////////////////////////////////////////////////////
+    struct nil {};
+    struct signed_;
+    struct program;
+
+    struct operand : x3::variant<
+            nil
+          , unsigned int
+          , x3::forward_ast<signed_>
+          , x3::forward_ast<program>
+        >
+    {
+        using base_type::base_type;
+        using base_type::operator=;
+    };
+
+    struct signed_
+    {
+        char sign;
+        operand operand_;
+    };
+
+    struct operation
+    {
+        char operator_;
+        operand operand_;
+    };
+
+    struct program
+    {
+        operand first;
+        std::list<operation> rest;
+    };
+}}
+
+BOOST_FUSION_ADAPT_STRUCT(client::ast::signed_,
+    sign, operand_
+)
+
+BOOST_FUSION_ADAPT_STRUCT(client::ast::operation,
+    operator_, operand_
+)
+
+BOOST_FUSION_ADAPT_STRUCT(client::ast::program,
+    first, rest
+)
+
+namespace client { namespace ast
+{
+    ///////////////////////////////////////////////////////////////////////////
+    //  The AST Printer
+    ///////////////////////////////////////////////////////////////////////////
+    struct printer
+    {
+        typedef void result_type;
+
+        void operator()(nil) const {}
+        void operator()(unsigned int n) const { std::cout << n; }
+
+        void operator()(operation const& x) const
+        {
+            boost::apply_visitor(*this, x.operand_);
+            switch (x.operator_)
+            {
+                case '+': std::cout << " add"; break;
+                case '-': std::cout << " subt"; break;
+                case '*': std::cout << " mult"; break;
+                case '/': std::cout << " div"; break;
+            }
+        }
+
+        void operator()(signed_ const& x) const
+        {
+            boost::apply_visitor(*this, x.operand_);
+            switch (x.sign)
+            {
+                case '-': std::cout << " neg"; break;
+                case '+': std::cout << " pos"; break;
+            }
+        }
+
+        void operator()(program const& x) const
+        {
+            boost::apply_visitor(*this, x.first);
+            for (operation const& oper: x.rest)
+            {
+                std::cout << ' ';
+                (*this)(oper);
+            }
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    //  The AST evaluator
+    ///////////////////////////////////////////////////////////////////////////
+    struct eval
+    {
+        typedef int result_type;
+
+        int operator()(nil) const { BOOST_ASSERT(0); return 0; }
+        int operator()(unsigned int n) const { return n; }
+
+        int operator()(int lhs, operation const& x) const
+        {
+            int rhs = boost::apply_visitor(*this, x.operand_);
+            switch (x.operator_)
+            {
+                case '+': return lhs + rhs;
+                case '-': return lhs - rhs;
+                case '*': return lhs * rhs;
+                case '/': return lhs / rhs;
+            }
+            BOOST_ASSERT(0);
+            return 0;
+        }
+
+        int operator()(signed_ const& x) const
+        {
+            int rhs = boost::apply_visitor(*this, x.operand_);
+            switch (x.sign)
+            {
+                case '-': return -rhs;
+                case '+': return +rhs;
+            }
+            BOOST_ASSERT(0);
+            return 0;
+        }
+
+        int operator()(program const& x) const
+        {
+            return std::accumulate(
+                x.rest.begin(), x.rest.end()
+              , boost::apply_visitor(*this, x.first)
+              , *this);
+        }
+    };
+}}
+
+namespace client
+{
+    ///////////////////////////////////////////////////////////////////////////////
+    //  The calculator grammar
+    ///////////////////////////////////////////////////////////////////////////////
+    namespace calculator_grammar
+    {
+        using x3::uint_;
+        using x3::char_;
+
+        x3::rule<class expression, ast::program> const expression("expression");
+        x3::rule<class term, ast::program> const term("term");
+        x3::rule<class factor, ast::operand> const factor("factor");
+
+        auto const expression_def =
+            term
+            >> *(   (char_('+') >> term)
+                |   (char_('-') >> term)
+                )
+            ;
+
+        auto const term_def =
+            factor
+            >> *(   (char_('*') >> factor)
+                |   (char_('/') >> factor)
+                )
+            ;
+
+        auto const factor_def =
+                uint_
+            |   '(' >> expression >> ')'
+            |   (char_('-') >> factor)
+            |   (char_('+') >> factor)
+            ;
+
+        BOOST_SPIRIT_DEFINE(
+            expression
+          , term
+          , factor
+        );
+
+        auto calculator = expression;
+    }
+
+    using calculator_grammar::calculator;
+
+}
+
+///////////////////////////////////////////////////////////////////////////////
+//  Main program
+///////////////////////////////////////////////////////////////////////////////
+int
+main()
+{
+    std::cout << "/////////////////////////////////////////////////////////\n\n";
+    std::cout << "Expression parser...\n\n";
+    std::cout << "/////////////////////////////////////////////////////////\n\n";
+    std::cout << "Type an expression...or [q or Q] to quit\n\n";
+
+    typedef std::string::const_iterator iterator_type;
+    typedef client::ast::program ast_program;
+    typedef client::ast::printer ast_print;
+    typedef client::ast::eval ast_eval;
+
+    std::string str;
+    while (std::getline(std::cin, str))
+    {
+        if (str.empty() || str[0] == 'q' || str[0] == 'Q')
+            break;
+
+        auto& calc = client::calculator;    // Our grammar
+        ast_program program;                // Our program (AST)
+        ast_print print;                    // Prints the program
+        ast_eval eval;                      // Evaluates the program
+
+        iterator_type iter = str.begin();
+        iterator_type end = str.end();
+        boost::spirit::x3::ascii::space_type space;
+        bool r = phrase_parse(iter, end, calc, space, program);
+
+        if (r && iter == end)
+        {
+            std::cout << "-------------------------\n";
+            std::cout << "Parsing succeeded\n";
+            print(program);
+            std::cout << "\nResult: " << eval(program) << std::endl;
+            std::cout << "-------------------------\n";
+        }
+        else
+        {
+            std::string rest(iter, end);
+            std::cout << "-------------------------\n";
+            std::cout << "Parsing failed\n";
+            std::cout << "stopped at: \"" << rest << "\"\n";
+            std::cout << "-------------------------\n";
+        }
+    }
+
+    std::cout << "Bye... :-) \n\n";
+    return 0;
+}