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Diffstat (limited to 'boost/metaparse/v1/one_char.hpp')
| -rw-r--r-- | boost/metaparse/v1/one_char.hpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/boost/metaparse/v1/one_char.hpp b/boost/metaparse/v1/one_char.hpp new file mode 100644 index 0000000000..0b129b2702 --- /dev/null +++ b/boost/metaparse/v1/one_char.hpp @@ -0,0 +1,71 @@ +#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 + |