88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
/*=============================================================================
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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_PARSER_BINDER_DECEMBER_05_2008_0516_PM)
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#define BOOST_SPIRIT_PARSER_BINDER_DECEMBER_05_2008_0516_PM
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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/fusion/include/at.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/spirit/home/support/has_semantic_action.hpp>
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namespace boost { namespace spirit { namespace qi { namespace detail
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{
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// parser_binder for plain rules
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template <typename Parser, typename Auto>
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struct parser_binder
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{
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parser_binder(Parser const& p_)
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: p(p_) {}
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template <typename Iterator, typename Skipper, typename Context>
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bool call(Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper, mpl::true_) const
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{
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// If DeducedAuto is false (semantic actions is present), the
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// component's attribute is unused.
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return p.parse(first, last, context, skipper, unused);
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}
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template <typename Iterator, typename Skipper, typename Context>
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bool call(Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper, mpl::false_) const
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{
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// If DeducedAuto is true (no semantic action), we pass the rule's
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// attribute on to the component.
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return p.parse(first, last, context, skipper
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, fusion::at_c<0>(context.attributes));
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}
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template <typename Iterator, typename Skipper, typename Context>
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bool operator()(
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Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper) const
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{
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// If Auto is false, we need to deduce whether to apply auto rule
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typedef typename traits::has_semantic_action<Parser>::type auto_rule;
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return call(first, last, context, skipper, auto_rule());
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}
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Parser p;
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};
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// parser_binder for auto rules
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template <typename Parser>
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struct parser_binder<Parser, mpl::true_>
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{
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parser_binder(Parser const& p_)
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: p(p_) {}
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template <typename Iterator, typename Skipper, typename Context>
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bool operator()(
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Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper) const
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{
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// If Auto is true, we pass the rule's attribute on to the component.
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return p.parse(first, last, context, skipper
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, fusion::at_c<0>(context.attributes));
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}
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Parser p;
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};
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template <typename Auto, typename Parser>
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inline parser_binder<Parser, Auto>
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bind_parser(Parser const& p)
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{
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return parser_binder<Parser, Auto>(p);
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}
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}}}}
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#endif
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