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difference.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\spirit\core\composite\difference.hpp
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/*============================================================================= Copyright (c) 1998-2003 Joel de Guzman Copyright (c) 2001 Daniel Nuffer Copyright (c) 2002 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) =============================================================================*/ #if !defined(BOOST_SPIRIT_DIFFERENCE_HPP) #define BOOST_SPIRIT_DIFFERENCE_HPP #include <boost/spirit/core/parser.hpp> #include <boost/spirit/core/primitives/primitives.hpp> #include <boost/spirit/core/composite/composite.hpp> #include <boost/spirit/meta/as_parser.hpp> namespace boost { namespace spirit { /////////////////////////////////////////////////////////////////////////// // // difference: a - b; Matches a but not b // // Handles expressions of the form: // // a - b // // where a and b are parsers. The expression returns a composite // parser that matches a but not b. One (not both) of the operands // may be a literal char, wchar_t or a primitive string char const*, // wchar_t const*. // /////////////////////////////////////////////////////////////////////////// struct difference_parser_gen; template <typename A, typename B> struct difference : public binary<A, B, parser<difference<A, B> > > { typedef difference<A, B> self_t; typedef binary_parser_category parser_category_t; typedef difference_parser_gen parser_generator_t; typedef binary<A, B, parser<self_t> > base_t; difference(A const& a, B const& b) : base_t(a, b) {} template <typename ScannerT> typename parser_result<self_t, ScannerT>::type parse(ScannerT const& scan) const { typedef typename parser_result<self_t, ScannerT>::type result_t; typedef typename ScannerT::iterator_t iterator_t; iterator_t save = scan.first; if (result_t hl = this->left().parse(scan)) { std::swap(save, scan.first); result_t hr = this->right().parse(scan); if (!hr || (hr.length() < hl.length())) { scan.first = save; return hl; } } return scan.no_match(); } }; struct difference_parser_gen { template <typename A, typename B> struct result { typedef difference< typename as_parser<A>::type , typename as_parser<B>::type > type; }; template <typename A, typename B> static difference< typename as_parser<A>::type , typename as_parser<B>::type > generate(A const& a, B const& b) { return difference<BOOST_DEDUCED_TYPENAME as_parser<A>::type, BOOST_DEDUCED_TYPENAME as_parser<B>::type> (as_parser<A>::convert(a), as_parser<B>::convert(b)); } }; template <typename A, typename B> difference<A, B> operator-(parser<A> const& a, parser<B> const& b); template <typename A> difference<A, chlit<char> > operator-(parser<A> const& a, char b); template <typename B> difference<chlit<char>, B> operator-(char a, parser<B> const& b); template <typename A> difference<A, strlit<char const*> > operator-(parser<A> const& a, char const* b); template <typename B> difference<strlit<char const*>, B> operator-(char const* a, parser<B> const& b); template <typename A> difference<A, chlit<wchar_t> > operator-(parser<A> const& a, wchar_t b); template <typename B> difference<chlit<wchar_t>, B> operator-(wchar_t a, parser<B> const& b); template <typename A> difference<A, strlit<wchar_t const*> > operator-(parser<A> const& a, wchar_t const* b); template <typename B> difference<strlit<wchar_t const*>, B> operator-(wchar_t const* a, parser<B> const& b); }} // namespace boost::spirit #endif #include <boost/spirit/core/composite/impl/difference.ipp>
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