Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(BOOST_SPIRIT_ATTR_JUL_23_2008_0956AM)
Chris@16: #define BOOST_SPIRIT_ATTR_JUL_23_2008_0956AM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/spirit/home/qi/domain.hpp>
Chris@16: #include <boost/spirit/home/qi/parser.hpp>
Chris@16: #include <boost/spirit/home/qi/detail/assign_to.hpp>
Chris@16: #include <boost/spirit/home/qi/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/support/common_terminals.hpp>
Chris@16: #include <boost/spirit/home/support/handles_container.hpp>
Chris@16: #include <boost/type_traits/add_reference.hpp>
Chris@16: #include <boost/type_traits/add_const.hpp>
Chris@16: #include <boost/type_traits/remove_const.hpp>
Chris@16: 
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Enablers
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename A0>       // enables attr()
Chris@16:     struct use_terminal<
Chris@16:             qi::domain, terminal_ex<tag::attr, fusion::vector1<A0> > >
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     template <>                  // enables *lazy* attr()
Chris@16:     struct use_lazy_terminal<qi::domain, tag::attr, 1>
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace qi
Chris@16: {
Chris@16: #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
Chris@16:     using spirit::attr;
Chris@16: #endif
Chris@16:     using spirit::attr_type;
Chris@16: 
Chris@16:     template <typename Value>
Chris@16:     struct attr_parser : primitive_parser<attr_parser<Value> >
Chris@16:     {
Chris@16:         template <typename Context, typename Iterator>
Chris@16:         struct attribute : remove_const<Value> {};
Chris@16: 
Chris@16:         attr_parser(typename add_reference<Value>::type value)
Chris@16:           : value_(value) {}
Chris@16: 
Chris@16:         template <typename Iterator, typename Context
Chris@16:           , typename Skipper, typename Attribute>
Chris@16:         bool parse(Iterator& /*first*/, Iterator const& /*last*/
Chris@16:           , Context& /*context*/, Skipper const& /*skipper*/
Chris@16:           , Attribute& attr_) const
Chris@16:         {
Chris@16:             spirit::traits::assign_to(value_, attr_);
Chris@16:             return true;        // never consume any input, succeed always
Chris@16:         }
Chris@16: 
Chris@16:         template <typename Context>
Chris@16:         info what(Context& /*context*/) const
Chris@16:         {
Chris@16:             return info("attr");
Chris@16:         }
Chris@16: 
Chris@16:         Value value_;
Chris@16: 
Chris@16:     private:
Chris@16:         // silence MSVC warning C4512: assignment operator could not be generated
Chris@16:         attr_parser& operator= (attr_parser const&);
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     // Parser generators: make_xxx function (objects)
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename Modifiers, typename A0>
Chris@16:     struct make_primitive<
Chris@16:         terminal_ex<tag::attr, fusion::vector1<A0> >
Chris@16:       , Modifiers>
Chris@16:     {
Chris@16:         typedef typename add_const<A0>::type const_value;
Chris@16:         typedef attr_parser<const_value> result_type;
Chris@16: 
Chris@16:         template <typename Terminal>
Chris@16:         result_type operator()(Terminal const& term, unused_type) const
Chris@16:         {
Chris@16:             return result_type(fusion::at_c<0>(term.args));
Chris@16:         }
Chris@16:     };
Chris@16: }}}
Chris@16: 
Chris@16: namespace boost { namespace spirit { namespace traits
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////
Chris@16:     template <typename T, typename Attr, typename Context, typename Iterator>
Chris@16:     struct handles_container<qi::attr_parser<T>, Attr, Context, Iterator>
Chris@16:       : traits::is_container<Attr> {}; 
Chris@16: }}}
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: