72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
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#ifndef BOOST_METAPARSE_V1_ONE_CHAR_HPP
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#define BOOST_METAPARSE_V1_ONE_CHAR_HPP
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// Copyright Abel Sinkovics (abel@sinkovics.hu) 2009 - 2011.
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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/error/unexpected_end_of_input.hpp>
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#include <boost/metaparse/v1/next_char.hpp>
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#include <boost/metaparse/v1/next_line.hpp>
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#include <boost/metaparse/v1/accept.hpp>
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#include <boost/metaparse/v1/reject.hpp>
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#include <boost/metaparse/v1/get_prev_char.hpp>
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#include <boost/mpl/empty.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/front.hpp>
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#include <boost/mpl/pop_front.hpp>
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#include <boost/mpl/bool.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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struct one_char
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{
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private:
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template <class C, class Pos>
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struct next_pos :
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boost::mpl::eval_if<
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boost::mpl::bool_<
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C::type::value == '\r'
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C::type::value == '\n'
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&& get_prev_char<Pos>::type::value != '\r'
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)
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>,
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next_line<Pos, C>,
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next_char<Pos, C>
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>
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{};
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template <class S, class NextPos>
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struct unchecked :
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accept<
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typename boost::mpl::front<S>::type,
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boost::mpl::pop_front<S>,
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NextPos
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>
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{};
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public:
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typedef one_char type;
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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 boost::mpl::empty<S>::type,
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reject<error::unexpected_end_of_input, Pos>,
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unchecked<S, next_pos<boost::mpl::front<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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}
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#endif
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