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alternative.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\alternative.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_ALTERNATIVE_HPP) #define BOOST_SPIRIT_ALTERNATIVE_HPP #include
#include
#include
#include
namespace boost { namespace spirit { /////////////////////////////////////////////////////////////////////////// // // alternative class // // Handles expressions of the form: // // a | b // // where a and b are parsers. The expression returns a composite // parser that matches a or b. One (not both) of the operands may // be a literal char, wchar_t or a primitive string char const*, // wchar_t const*. // // The expression is short circuit evaluated. b is never touched // when a is returns a successful match. // /////////////////////////////////////////////////////////////////////////// struct alternative_parser_gen; template
struct alternative : public binary
> > { typedef alternative
self_t; typedef binary_parser_category parser_category_t; typedef alternative_parser_gen parser_generator_t; typedef binary
> base_t; alternative(A const& a, B const& b) : base_t(a, b) {} template
typename parser_result
::type parse(ScannerT const& scan) const { typedef typename parser_result
::type result_t; typedef typename ScannerT::iterator_t iterator_t; { // scope for save iterator_t save = scan.first; if (result_t hit = this->left().parse(scan)) return hit; scan.first = save; } return this->right().parse(scan); } }; struct alternative_parser_gen { template
struct result { typedef alternative< typename as_parser
::type , typename as_parser
::type > type; }; template
static alternative< typename as_parser
::type , typename as_parser
::type > generate(A const& a, B const& b) { return alternative
::type, BOOST_DEDUCED_TYPENAME as_parser
::type> (as_parser
::convert(a), as_parser
::convert(b)); } }; template
alternative
operator|(parser
const& a, parser
const& b); template
alternative
> operator|(parser
const& a, char b); template
alternative
, B> operator|(char a, parser
const& b); template
alternative
> operator|(parser
const& a, char const* b); template
alternative
, B> operator|(char const* a, parser
const& b); template
alternative
> operator|(parser
const& a, wchar_t b); template
alternative
, B> operator|(wchar_t a, parser
const& b); template
alternative
> operator|(parser
const& a, wchar_t const* b); template
alternative
, B> operator|(wchar_t const* a, parser
const& b); }} // namespace boost::spirit #endif #include
alternative.hpp
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