110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Hartmut Kaiser
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Copyright (c) 2001-2011 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_ATTR_JUL_23_2008_0956AM)
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#define BOOST_SPIRIT_ATTR_JUL_23_2008_0956AM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/mpl/bool.hpp>
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/qi/parser.hpp>
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#include <boost/spirit/home/qi/detail/assign_to.hpp>
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#include <boost/spirit/home/qi/meta_compiler.hpp>
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#include <boost/spirit/home/support/common_terminals.hpp>
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#include <boost/spirit/home/support/handles_container.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/type_traits/remove_const.hpp>
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// Enablers
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///////////////////////////////////////////////////////////////////////////
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template <typename A0> // enables attr()
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struct use_terminal<
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qi::domain, terminal_ex<tag::attr, fusion::vector1<A0> > >
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: mpl::true_ {};
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template <> // enables *lazy* attr()
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struct use_lazy_terminal<qi::domain, tag::attr, 1>
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: mpl::true_ {};
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}}
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namespace boost { namespace spirit { namespace qi
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{
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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
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using spirit::attr;
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#endif
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using spirit::attr_type;
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template <typename Value>
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struct attr_parser : primitive_parser<attr_parser<Value> >
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{
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template <typename Context, typename Iterator>
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struct attribute : remove_const<Value> {};
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attr_parser(typename add_reference<Value>::type value)
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: value_(value) {}
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template <typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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bool parse(Iterator& /*first*/, Iterator const& /*last*/
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, Context& /*context*/, Skipper const& /*skipper*/
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, Attribute& attr_) const
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{
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spirit::traits::assign_to(value_, attr_);
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return true; // never consume any input, succeed always
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}
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template <typename Context>
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info what(Context& /*context*/) const
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{
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return info("attr");
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}
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Value value_;
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// silence MSVC warning C4512: assignment operator could not be generated
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BOOST_DELETED_FUNCTION(attr_parser& operator= (attr_parser const&))
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};
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///////////////////////////////////////////////////////////////////////////
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// Parser generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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template <typename Modifiers, typename A0>
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struct make_primitive<
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terminal_ex<tag::attr, fusion::vector1<A0> >
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, Modifiers>
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{
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typedef typename add_const<A0>::type const_value;
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typedef attr_parser<const_value> result_type;
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template <typename Terminal>
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result_type operator()(Terminal const& term, unused_type) const
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{
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return result_type(fusion::at_c<0>(term.args));
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}
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};
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}}}
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namespace boost { namespace spirit { namespace traits
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{
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename Attr, typename Context, typename Iterator>
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struct handles_container<qi::attr_parser<T>, Attr, Context, Iterator>
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: traits::is_container<Attr> {};
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}}}
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#endif
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