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sequential_or.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\sequential_or.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_SEQUENTIAL_OR_HPP) #define BOOST_SPIRIT_SEQUENTIAL_OR_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 { /////////////////////////////////////////////////////////////////////////// // // sequential-or class // // Handles expressions of the form: // // a || b // // Equivalent to // // a | b | a >> b; // // where a and b are parsers. The expression returns a composite // parser that matches matches a or b in sequence. One (not both) of // the operands may be a literal char, wchar_t or a primitive string // char const*, wchar_t const*. // /////////////////////////////////////////////////////////////////////////// struct sequential_or_parser_gen; template <typename A, typename B> struct sequential_or : public binary<A, B, parser<sequential_or<A, B> > > { typedef sequential_or<A, B> self_t; typedef binary_parser_category parser_category_t; typedef sequential_or_parser_gen parser_generator_t; typedef binary<A, B, parser<self_t> > base_t; sequential_or(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; { // scope for save iterator_t save = scan.first; if (result_t ma = this->left().parse(scan)) { save = scan.first; if (result_t mb = this->right().parse(scan)) { // matched a b scan.concat_match(ma, mb); return ma; } else { // matched a scan.first = save; return ma; } } scan.first = save; } // matched b return this->right().parse(scan); } }; struct sequential_or_parser_gen { template <typename A, typename B> struct result { typedef sequential_or< typename as_parser<A>::type , typename as_parser<B>::type > type; }; template <typename A, typename B> static sequential_or< typename as_parser<A>::type , typename as_parser<B>::type > generate(A const& a, B const& b) { return sequential_or<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> sequential_or<A, B> operator||(parser<A> const& a, parser<B> const& b); template <typename A> sequential_or<A, chlit<char> > operator||(parser<A> const& a, char b); template <typename B> sequential_or<chlit<char>, B> operator||(char a, parser<B> const& b); template <typename A> sequential_or<A, strlit<char const*> > operator||(parser<A> const& a, char const* b); template <typename B> sequential_or<strlit<char const*>, B> operator||(char const* a, parser<B> const& b); template <typename A> sequential_or<A, chlit<wchar_t> > operator||(parser<A> const& a, wchar_t b); template <typename B> sequential_or<chlit<wchar_t>, B> operator||(wchar_t a, parser<B> const& b); template <typename A> sequential_or<A, strlit<wchar_t const*> > operator||(parser<A> const& a, wchar_t const* b); template <typename B> sequential_or<strlit<wchar_t const*>, B> operator||(wchar_t const* a, parser<B> const& b); }} // namespace boost::spirit #endif #include <boost/spirit/core/composite/impl/sequential_or.ipp>
sequential_or.hpp
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