83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
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#ifndef BOOST_METAPARSE_V1_KEYWORD_HPP
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#define BOOST_METAPARSE_V1_KEYWORD_HPP
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// Copyright Abel Sinkovics (abel@sinkovics.hu) 2009 - 2010.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/metaparse/v1/impl/void_.hpp>
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#include <boost/metaparse/v1/lit.hpp>
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#include <boost/metaparse/v1/return_.hpp>
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#include <boost/metaparse/v1/is_error.hpp>
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#include <boost/metaparse/v1/get_remaining.hpp>
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#include <boost/metaparse/v1/get_position.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/empty.hpp>
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#include <boost/mpl/pop_front.hpp>
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#include <boost/mpl/front.hpp>
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namespace boost
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{
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namespace metaparse
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{
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namespace v1
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{
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// Does not consume/check anything after the keyword
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template <class Kw, class ResultType = impl::void_>
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struct keyword
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{
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private:
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struct nonempty
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{
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private:
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typedef lit<typename boost::mpl::front<Kw>::type> next_char_parser;
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typedef
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keyword<typename boost::mpl::pop_front<Kw>::type, ResultType>
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rest_parser;
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template <class S, class Pos>
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struct apply_unchecked :
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rest_parser::template apply<
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typename get_remaining<
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typename next_char_parser::template apply<S, Pos>
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>::type,
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typename get_position<
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typename next_char_parser::template apply<S, Pos>
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>::type
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>
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{};
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public:
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template <class S, class Pos>
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struct apply :
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boost::mpl::eval_if<
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typename is_error<
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typename next_char_parser::template apply<S, Pos>
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>::type,
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typename next_char_parser::template apply<S, Pos>,
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apply_unchecked<S, Pos>
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>
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{};
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};
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public:
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typedef keyword type;
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template <class S, class Pos>
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struct apply :
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boost::mpl::if_<
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boost::mpl::empty<Kw>,
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return_<ResultType>,
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nonempty
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>::type::template apply<S, Pos>
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{};
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};
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}
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}
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}
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#endif
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