| /*============================================================================= |
| Copyright (c) 2001-2010 Hartmut Kaiser |
| Copyright (c) 2001-2010 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_ATTR_JUL_23_2008_0956AM) |
| #define BOOST_SPIRIT_ATTR_JUL_23_2008_0956AM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/mpl/bool.hpp> |
| #include <boost/spirit/home/qi/domain.hpp> |
| #include <boost/spirit/home/qi/parser.hpp> |
| #include <boost/spirit/home/qi/detail/assign_to.hpp> |
| #include <boost/spirit/home/qi/meta_compiler.hpp> |
| #include <boost/spirit/home/support/common_terminals.hpp> |
| #include <boost/type_traits/add_reference.hpp> |
| #include <boost/type_traits/add_const.hpp> |
| #include <boost/type_traits/remove_const.hpp> |
| |
| namespace boost { namespace spirit |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Enablers |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename A0> // enables attr() |
| struct use_terminal< |
| qi::domain, terminal_ex<tag::attr, fusion::vector1<A0> > > |
| : mpl::true_ {}; |
| |
| template <> // enables *lazy* attr() |
| struct use_lazy_terminal<qi::domain, tag::attr, 1> |
| : mpl::true_ {}; |
| |
| }} |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| using spirit::attr; |
| |
| template <typename Value> |
| struct attr_parser : primitive_parser<attr_parser<Value> > |
| { |
| template <typename Context, typename Iterator> |
| struct attribute : remove_const<Value> {}; |
| |
| attr_parser(typename add_reference<Value>::type value) |
| : value_(value) {} |
| |
| template <typename Iterator, typename Context |
| , typename Skipper, typename Attribute> |
| bool parse(Iterator& /*first*/, Iterator const& /*last*/ |
| , Context& /*context*/, Skipper const& /*skipper*/ |
| , Attribute& attr) const |
| { |
| spirit::traits::assign_to(value_, attr); |
| return true; // never consume any input, succeed always |
| } |
| |
| template <typename Context> |
| info what(Context& /*context*/) const |
| { |
| return info("attr"); |
| } |
| |
| Value value_; |
| |
| private: |
| // silence MSVC warning C4512: assignment operator could not be generated |
| attr_parser& operator= (attr_parser const&); |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Parser generators: make_xxx function (objects) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Modifiers, typename A0> |
| struct make_primitive< |
| terminal_ex<tag::attr, fusion::vector1<A0> > |
| , Modifiers> |
| { |
| typedef typename add_const<A0>::type const_value; |
| typedef attr_parser<const_value> result_type; |
| |
| template <typename Terminal> |
| result_type operator()(Terminal const& term, unused_type) const |
| { |
| return result_type(fusion::at_c<0>(term.args)); |
| } |
| }; |
| }}} |
| |
| #endif |
| |
| |