primitives.ipp

著名的Parser库Spirit在VC6上的Port

/*=============================================================================
    Parser primitives

    Spirit V1.2
    Copyright (c) 2001, Joel de Guzman

    This software is provided 'as-is', without any express or implied
    warranty. In no event will the copyright holder be held liable for
    any damages arising from the use of this software.

    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute
    it freely, subject to the following restrictions:

    1.  The origin of this software must not be misrepresented; you must
        not claim that you wrote the original software. If you use this
        software in a product, an acknowledgment in the product documentation
        would be appreciated but is not required.

    2.  Altered source versions must be plainly marked as such, and must
        not be misrepresented as being the original software.

    3.  This notice may not be removed or altered from any source
        distribution.

    Acknowledgements:

        Special thanks to Dan Nuffer, John (EBo) David, Chris Uzdavinis,
        and Doug Gregor. These people are most instrumental in steering
        Spirit in the right direction.

        Special thanks also to people who have contributed to the code base
        and sample code, ported Spirit to various platforms and compilers,
        gave suggestions, reported and provided bug fixes. Alexander
        Hirner, Andy Elvey, Bogdan Kushnir, Brett Calcott, Bruce Florman,
        Changzhe Han, Colin McPhail, Hakki Dogusan, Jan Bares, Joseph
        Smith, Martijn W. van der Lee, Raghavendra Satish, Remi Delcos, Tom
        Spilman, Vladimir Prus, W. Scott Dillman, David A. Greene, Bob
        Bailey, Hartmut Kaiser.

        Finally special thanks also to people who gave feedback and
        valuable comments, particularly members of Spirit's Source Forge
        mailing list and boost.org.

    URL: http://spirit.sourceforge.net/

=============================================================================*/
#ifndef SPIRIT_PRIMITIVES_IPP
#define SPIRIT_PRIMITIVES_IPP

///////////////////////////////////////////////////////////////////////////////

#include <cassert>
#include <cctype>
#if __GNUC__ > 2 || defined(__MWERKS__)
    #include <cwctype>
#endif
#include <string>

#include "boost/spirit/primitives.hpp"
#include "boost/spirit/iterators.hpp"

///////////////////////////////////////////////////////////////////////////////
namespace spirit {

///////////////////////////////////////////////////////////////////////////////
//
//  char_action class implementation
//
///////////////////////////////////////////////////////////////////////////////
template <typename ParserT, typename ActionT>
inline char_action<ParserT, ActionT>::char_action(
    ParserT const&  subject,
    ActionT const&   actor_)
:
    unary<ParserT>(subject),
    actor(actor_) {}

//////////////////////////////////
template <typename ParserT, typename ActionT>
template <typename IteratorT>
inline match
char_action<ParserT, ActionT>::
    parse(IteratorT& first, IteratorT const& last) const
{
    if (first != last)
    {
        typedef impl::strip_scanner<IteratorT> strip_scanner;
        typename strip_scanner::iterator_type
            begin = strip_scanner::get(first);

        if (match hit = this->subject().parse(first, last))
        {
            actor(*begin);
            return hit;
        }
    }
    return match();
}

//////////////////////////////////
template <typename ParserT, typename ActionT>
template <typename IteratorT, typename MatchTraitsT>
inline typename MatchTraitsT::match_t
char_action<ParserT, ActionT>::ast_parse(IteratorT& first, 
        IteratorT const& last, MatchTraitsT const& mt) const
{
    if (first != last)
    {
        typedef impl::strip_scanner<IteratorT> strip_scanner;
        typename strip_scanner::iterator_type
            begin = strip_scanner::get(first);

        if (typename MatchTraitsT::match_t hit = 
                this->subject().ast_parse(first, last, mt))
        {
            actor(*begin);
            return hit;
        }
    }
    return MatchTraitsT::no_match;
}

///////////////////////////////////////////////////////////////////////////////
//
//  char_parser class implementation
//
///////////////////////////////////////////////////////////////////////////////
template <typename DerivedT>
template <typename ActionT>
inline char_action<DerivedT, ActionT>
char_parser<DerivedT>::operator[](ActionT const& actor) const
{
    return char_action<DerivedT, ActionT>(this->derived(), actor);
}

//////////////////////////////////
template <typename DerivedT>
template <typename IteratorT>
inline match
char_parser<DerivedT>::parse(IteratorT& first, IteratorT const& last) const
{
    if (first != last)
        if (this->derived().test(*first))
        {
            ++first;
            return match(1);
        }
    return match();
}

//////////////////////////////////
template <typename DerivedT>
template <typename IteratorT, typename MatchTraitsT>
inline typename MatchTraitsT::match_t
char_parser<DerivedT>::ast_parse(IteratorT& first, IteratorT const& last, 
        MatchTraitsT const& /*mt*/) const
{
    if (first != last)
        if (this->derived().test(*first))
        {
            IteratorT s(first);
            ++first;
            return MatchTraitsT::create_match(1, s, first);
        }
    return MatchTraitsT::no_match;
}

///////////////////////////////////////////////////////////////////////////////
//
//  chlit class implementation
//
///////////////////////////////////////////////////////////////////////////////
template <typename CharT>
inline chlit<CharT>::chlit(CharT ch_)
:   ch(ch_) {}

//////////////////////////////////
template <typename CharT>
template <typename T>
inline bool
chlit<CharT>::test(T ch_) const
{
    return T(ch) == ch_;
}

///////////////////////////////////////////////////////////////////////////////
//
//  range class implementation
//
///////////////////////////////////////////////////////////////////////////////
template <typename CharAT, typename CharBT>
inline range<CharAT, CharBT>::range(CharAT first_, CharBT last_)
:   first(first_), last(last_)
{
    assert(first <= last);
}

//////////////////////////////////
template <typename CharAT, typename CharBT>
template <typename T>
inline bool
range<CharAT, CharBT>::test(T ch) const
{
    return (CharAT(ch) >= first) && (CharBT(ch) <= last);
}

///////////////////////////////////////////////////////////////////////////////
//
//  cstring class implementation
//
///////////////////////////////////////////////////////////////////////////////
template <typename CharT>
inline cstring<CharT>::cstring(const_iterator str, unsigned len)
:   first(str), last(str + len) {}

//////////////////////////////////
template <typename CharT>
inline cstring<CharT>::cstring(const_iterator str)
:   first(str)
{
    while (*str)
        str++;
    last = str;
}

//////////////////////////////////
template <typename CharT>
inline typename cstring<CharT>::const_iterator
cstring<CharT>::begin() const
{
    return first;
}

//////////////////////////////////
template <typename CharT>
inline typename cstring<CharT>::const_iterator
cstring<CharT>::end() const
{
    return last;
}

//////////////////////////////////
template <typename CharT>
inline std::size_t
cstring<CharT>::length() const
{
    return last-first;
}

///////////////////////////////////////////////////////////////////////////////
//
//  strlit class implementation
//
///////////////////////////////////////////////////////////////////////////////
template <typename StringT>
inline strlit<StringT>::strlit(StringT str_)
:   str(str_) {}

//////////////////////////////////
template <typename StringT>
inline strlit<StringT>::strlit(raw_string_type str_)
:   str(str_) {}

//////////////////////////////////
template <typename StringT>
template <typename IteratorT>
inline match
strlit<StringT>::parse(IteratorT& first, IteratorT const& last) const
{
    typedef typename impl::strip_scanner<IteratorT>
        ::iterator_type plain_iter;
    plain_iter  i1 = impl::strip_scanner<IteratorT>::get(first);
    plain_iter  i2 = impl::strip_scanner<IteratorT>::get(last);

    actual_type s = str;
    raw_string_type strEnd = s.end();

    for (raw_string_type strFirst = s.begin();
        strFirst != strEnd; ++strFirst, ++i1)
        if ((i1 == i2) || (*strFirst != *i1))
            return match();
    first = i1;
    return match(s.length());
}