| /*============================================================================= |
| Copyright (c) 2001-2007 Joel de Guzman |
| |
| Distributed under 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_CHAR_PARSER_APR_16_2006_0906AM) |
| #define BOOST_SPIRIT_CHAR_PARSER_APR_16_2006_0906AM |
| |
| #include <string> |
| #include <boost/spirit/home/qi/skip.hpp> |
| #include <boost/spirit/home/qi/detail/assign_to.hpp> |
| #include <boost/spirit/home/support/unused.hpp> |
| #include <boost/fusion/include/at.hpp> |
| |
| #include <boost/detail/iterator.hpp> // for boost::detail::iterator_traits |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| template <typename Derived, typename Char = unused_type> |
| struct char_parser |
| { |
| typedef Char char_type; |
| |
| // if Char is unused_type, Derived must supply its own attribute metafunction |
| template <typename Component, typename Context, typename Iterator> |
| struct attribute |
| { |
| typedef Char type; |
| }; |
| |
| template < |
| typename Component |
| , typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| static bool parse( |
| Component const& component |
| , Iterator& first, Iterator const& last |
| , Context& context, Skipper const& skipper |
| , Attribute& attr) |
| { |
| qi::skip(first, last, skipper); |
| |
| if (first != last && Derived::test(component, *first, context)) |
| { |
| qi::detail::assign_to(*first, attr); |
| ++first; |
| return true; |
| } |
| return false; |
| } |
| |
| // char_parser subclasses are required to |
| // implement test: |
| |
| template <typename Component, typename CharParam, typename Context> |
| bool test(Component const& component, CharParam ch, Context& context); |
| }; |
| |
| template <typename Positive> |
| struct negated_char_parser : |
| char_parser< |
| negated_char_parser<Positive>, typename Positive::director::char_type |
| > |
| { |
| template <typename Component, typename CharParam, typename Context> |
| static bool test(Component const& component, CharParam ch, Context& context) |
| { |
| return !Positive::director::test( |
| fusion::at_c<0>(component.elements), ch, context); |
| } |
| |
| template <typename Component, typename Context> |
| static std::string what(Component const& component, Context const& ctx) |
| { |
| return std::string("not ") |
| + Positive::director::what(fusion::at_c<0>(component.elements), ctx); |
| } |
| }; |
| }}} |
| |
| #endif |