grammar_tests.cpp

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

/*=============================================================================
    Copyright (c) 2001-2003 Joel de Guzman
    Copyright (c) 2003 Hartmut Kaiser
    http://spirit.sourceforge.net/

    Use, modification and distribution is subject to 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)
=============================================================================*/
#include <iostream>
#include <cassert>

using namespace std;

//#define BOOST_SPIRIT_DEBUG
#define BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE
#include <boost/spirit/core.hpp>
#include <boost/spirit/utility/grammar_def.hpp>
using namespace boost::spirit;

///////////////////////////////////////////////////////////////////////////////
//  This feature is disabled on non compliant compilers (e.g. Borland 5.5.1
//  VC6 and VC7)
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && \
    !BOOST_WORKAROUND(__BORLANDC__, <= 0x551) && \
    !BOOST_WORKAROUND(__GNUC__, < 3)
# define BOOST_SPIRIT_USE_GRAMMARDEF
#endif

//////////////////////////////////////////////////////////////////////////////
//
//  Grammar tests
//
///////////////////////////////////////////////////////////////////////////////
struct num_list : public grammar<num_list>
{
    enum {
        default_rule = 0,
        num_rule = 1,
    };

    template <typename ScannerT>
    struct definition
#if defined(BOOST_SPIRIT_USE_GRAMMARDEF)
    :   public grammar_def<rule<ScannerT>, same>
#endif
    {
        definition(num_list const& /*self*/)
        {
            num = int_p;
            r = num >> *(',' >> num);

#if defined(BOOST_SPIRIT_USE_GRAMMARDEF)
            this->start_parsers(r, num);
#endif
            BOOST_SPIRIT_DEBUG_RULE(num);
            BOOST_SPIRIT_DEBUG_RULE(r);
        }

        rule<ScannerT> r, num;

#if !defined(BOOST_SPIRIT_USE_GRAMMARDEF)
        rule<ScannerT> const& start() const { return r; }
#endif
    };
};

struct num_list_ex : public grammar<num_list_ex>
{
    enum {
        default_rule = 0,
        num_rule = 1,
        integer_rule = 2
    };

    template <typename ScannerT>
    struct definition
#if defined(BOOST_SPIRIT_USE_GRAMMARDEF)
    :   public grammar_def<rule<ScannerT>, same, int_parser<int, 10, 1, -1> >
#endif
    {
        definition(num_list_ex const& /*self*/)
        {
            num = integer;
            r = num >> *(',' >> num);

#if defined(BOOST_SPIRIT_USE_GRAMMARDEF)
            this->start_parsers(r, num, integer);
#endif
            BOOST_SPIRIT_DEBUG_RULE(num);
            BOOST_SPIRIT_DEBUG_RULE(r);
        }

        rule<ScannerT> r, num;
        int_parser<int, 10, 1, -1> integer;

#if !defined(BOOST_SPIRIT_USE_GRAMMARDEF)
        rule<ScannerT> const& start() const { return r; }
#endif
    };
};

void
grammar_tests()
{
    num_list nlist;
    BOOST_SPIRIT_DEBUG_GRAMMAR(nlist);

    parse_info<char const*> pi;
    pi = parse("123, 456, 789", nlist, space_p);
    assert(pi.hit);
    assert(pi.full);

#if defined(BOOST_SPIRIT_USE_GRAMMARDEF)
    num_list_ex nlistex;
    BOOST_SPIRIT_DEBUG_GRAMMAR(nlistex);

    pi = parse("123, 456, 789", nlist.use_parser<num_list::default_rule>(),
        space_p);
    assert(pi.hit);
    assert(pi.full);

    pi = parse("123", nlist.use_parser<num_list::num_rule>(), space_p);
    assert(pi.hit);
    assert(pi.full);

    pi = parse("123, 456, 789", nlistex, space_p);
    assert(pi.hit);
    assert(pi.full);

    pi = parse("123, 456, 789",
        nlistex.use_parser<num_list_ex::default_rule>(), space_p);
    assert(pi.hit);
    assert(pi.full);

    pi = parse("123", nlistex.use_parser<num_list_ex::num_rule>(), space_p);
    assert(pi.hit);
    assert(pi.full);

    pi = parse("123", nlistex.use_parser<num_list_ex::integer_rule>(),
        space_p);
    assert(pi.hit);
    assert(pi.full);
#endif // defined(BOOST_SPIRIT_USE_GRAMMARDEF)
}

///////////////////////////////////////////////////////////////////////////////
//
//  Main
//
///////////////////////////////////////////////////////////////////////////////
int
main()
{
    grammar_tests();
    cout << "Tests concluded successfully\n";
    return 0;
}