#ifndef BOOST_METAPARSE_V1_ONE_CHAR_HPP #define BOOST_METAPARSE_V1_ONE_CHAR_HPP // Copyright Abel Sinkovics (abel@sinkovics.hu) 2009 - 2011. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #include <boost/metaparse/v1/error/unexpected_end_of_input.hpp> #include <boost/metaparse/v1/next_char.hpp> #include <boost/metaparse/v1/next_line.hpp> #include <boost/metaparse/v1/accept.hpp> #include <boost/metaparse/v1/reject.hpp> #include <boost/metaparse/v1/get_prev_char.hpp> #include <boost/mpl/empty.hpp> #include <boost/mpl/eval_if.hpp> #include <boost/mpl/front.hpp> #include <boost/mpl/pop_front.hpp> #include <boost/mpl/bool.hpp> namespace boost { namespace metaparse { namespace v1 { struct one_char { private: template <class C, class Pos> struct next_pos : boost::mpl::eval_if< boost::mpl::bool_< C::type::value == '\r' || ( C::type::value == '\n' && get_prev_char<Pos>::type::value != '\r' ) >, next_line<Pos, C>, next_char<Pos, C> > {}; template <class S, class NextPos> struct unchecked : accept< typename boost::mpl::front<S>::type, boost::mpl::pop_front<S>, NextPos > {}; public: typedef one_char type; template <class S, class Pos> struct apply : boost::mpl::eval_if< typename boost::mpl::empty<S>::type, reject<error::unexpected_end_of_input, Pos>, unchecked<S, next_pos<boost::mpl::front<S>, Pos> > > {}; }; } } } #endif