83 lines
2.8 KiB
C++
Executable File
83 lines
2.8 KiB
C++
Executable File
/*=============================================================================
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Copyright (c) 2001-2007 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_SPIRIT_CHAR_PARSER_APR_16_2006_0906AM)
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#define BOOST_SPIRIT_CHAR_PARSER_APR_16_2006_0906AM
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#include <string>
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#include <boost/spirit/home/qi/skip.hpp>
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#include <boost/spirit/home/qi/detail/assign_to.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/fusion/include/at.hpp>
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#include <boost/detail/iterator.hpp> // for boost::detail::iterator_traits
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namespace boost { namespace spirit { namespace qi
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{
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template <typename Derived, typename Char = unused_type>
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struct char_parser
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{
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typedef Char char_type;
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// if Char is unused_type, Derived must supply its own attribute metafunction
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template <typename Component, typename Context, typename Iterator>
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struct attribute
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{
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typedef Char type;
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};
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template <
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typename Component
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, typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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static bool parse(
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Component const& component
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, Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper
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, Attribute& attr)
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{
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qi::skip(first, last, skipper);
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if (first != last && Derived::test(component, *first, context))
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{
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qi::detail::assign_to(*first, attr);
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++first;
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return true;
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}
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return false;
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}
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// char_parser subclasses are required to
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// implement test:
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template <typename Component, typename CharParam, typename Context>
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bool test(Component const& component, CharParam ch, Context& context);
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};
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template <typename Positive>
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struct negated_char_parser :
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char_parser<
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negated_char_parser<Positive>, typename Positive::director::char_type
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>
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{
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template <typename Component, typename CharParam, typename Context>
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static bool test(Component const& component, CharParam ch, Context& context)
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{
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return !Positive::director::test(
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fusion::at_c<0>(component.elements), ch, context);
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}
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template <typename Component, typename Context>
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static std::string what(Component const& component, Context const& ctx)
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{
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return std::string("not ")
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+ Positive::director::what(fusion::at_c<0>(component.elements), ctx);
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}
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};
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}}}
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#endif
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