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110 lines
3.7 KiB
110 lines
3.7 KiB
/*============================================================================= |
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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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private: |
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// silence MSVC warning C4512: assignment operator could not be generated |
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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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