projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | #ifndef BOOST_METAPARSE_V1_KEYWORD_HPP |
| 2 | #define BOOST_METAPARSE_V1_KEYWORD_HPP | |
| 3 | ||
| 4 | // Copyright Abel Sinkovics (abel@sinkovics.hu) 2009 - 2010. | |
| 5 | // Distributed under the Boost Software License, Version 1.0. | |
| 6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
| 7 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 8 | ||
| 9 | #include <boost/metaparse/v1/impl/void_.hpp> | |
| 10 | #include <boost/metaparse/v1/lit.hpp> | |
| 11 | #include <boost/metaparse/v1/return_.hpp> | |
| 12 | #include <boost/metaparse/v1/is_error.hpp> | |
| 13 | #include <boost/metaparse/v1/get_remaining.hpp> | |
| 14 | #include <boost/metaparse/v1/get_position.hpp> | |
| 15 | ||
| 16 | #include <boost/mpl/if.hpp> | |
| 17 | #include <boost/mpl/eval_if.hpp> | |
| 18 | #include <boost/mpl/empty.hpp> | |
| 19 | #include <boost/mpl/pop_front.hpp> | |
| 20 | #include <boost/mpl/front.hpp> | |
| 21 | ||
| 22 | namespace boost | |
| 23 | { | |
| 24 | namespace metaparse | |
| 25 | { | |
| 26 | namespace v1 | |
| 27 | { | |
| 28 | // Does not consume/check anything after the keyword | |
| 29 | template <class Kw, class ResultType = impl::void_> | |
| 30 | struct keyword | |
| 31 | { | |
| 32 | private: | |
| 33 | struct nonempty | |
| 34 | { | |
| 35 | private: | |
| 36 | typedef lit<typename boost::mpl::front<Kw>::type> next_char_parser; | |
| 37 | ||
| 38 | typedef | |
| 39 | keyword<typename boost::mpl::pop_front<Kw>::type, ResultType> | |
| 40 | rest_parser; | |
| 41 | ||
| 42 | template <class S, class Pos> | |
| 43 | struct apply_unchecked : | |
| 44 | rest_parser::template apply< | |
| 45 | typename get_remaining< | |
| 46 | typename next_char_parser::template apply<S, Pos> | |
| 47 | >::type, | |
| 48 | typename get_position< | |
| 49 | typename next_char_parser::template apply<S, Pos> | |
| 50 | >::type | |
| 51 | > | |
| 52 | {}; | |
| 53 | public: | |
| 54 | template <class S, class Pos> | |
| 55 | struct apply : | |
| 56 | boost::mpl::eval_if< | |
| 57 | typename is_error< | |
| 58 | typename next_char_parser::template apply<S, Pos> | |
| 59 | >::type, | |
| 60 | typename next_char_parser::template apply<S, Pos>, | |
| 61 | apply_unchecked<S, Pos> | |
| 62 | > | |
| 63 | {}; | |
| 64 | }; | |
| 65 | public: | |
| 66 | typedef keyword type; | |
| 67 | ||
| 68 | template <class S, class Pos> | |
| 69 | struct apply : | |
| 70 | boost::mpl::if_< | |
| 71 | boost::mpl::empty<Kw>, | |
| 72 | return_<ResultType>, | |
| 73 | nonempty | |
| 74 | >::type::template apply<S, Pos> | |
| 75 | {}; | |
| 76 | }; | |
| 77 | } | |
| 78 | } | |
| 79 | } | |
| 80 | ||
| 81 | #endif | |
| 82 |