boost/xpressive/detail/static/grammar.hpp
/////////////////////////////////////////////////////////////////////////////// // grammar.hpp // // Copyright 2008 Eric Niebler. 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) #ifndef BOOST_XPRESSIVE_DETAIL_STATIC_GRAMMAR_HPP_EAN_11_12_2006 #define BOOST_XPRESSIVE_DETAIL_STATIC_GRAMMAR_HPP_EAN_11_12_2006 // MS compatible compilers support #pragma once #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif #include <boost/mpl/if.hpp> #include <boost/mpl/bool.hpp> #include <boost/mpl/assert.hpp> #include <boost/proto/core.hpp> #include <boost/xpressive/detail/static/is_pure.hpp> #include <boost/xpressive/detail/static/transforms/as_matcher.hpp> #include <boost/xpressive/detail/static/transforms/as_alternate.hpp> #include <boost/xpressive/detail/static/transforms/as_sequence.hpp> #include <boost/xpressive/detail/static/transforms/as_quantifier.hpp> #include <boost/xpressive/detail/static/transforms/as_marker.hpp> #include <boost/xpressive/detail/static/transforms/as_set.hpp> #include <boost/xpressive/detail/static/transforms/as_independent.hpp> #include <boost/xpressive/detail/static/transforms/as_modifier.hpp> #include <boost/xpressive/detail/static/transforms/as_inverse.hpp> #include <boost/xpressive/detail/static/transforms/as_action.hpp> #include <boost/xpressive/detail/detail_fwd.hpp> #define BOOST_XPRESSIVE_CHECK_REGEX(Expr, Char)\ BOOST_MPL_ASSERT\ ((\ typename boost::mpl::if_c<\ boost::xpressive::is_valid_regex<Expr, Char>::value\ , boost::mpl::true_\ , boost::xpressive::INVALID_REGULAR_EXPRESSION\ >::type\ )); ////////////////////////////////////////////////////////////////////////// //**********************************************************************// //* << NOTE! >> *// //* *// //* Whenever you change this grammar, you MUST also make corresponding *// //* changes to width_of.hpp and is_pure.hpp. *// //* *// //**********************************************************************// ////////////////////////////////////////////////////////////////////////// namespace boost { namespace xpressive { template<typename Char> struct Grammar; template<typename Char> struct ActionableGrammar; namespace grammar_detail { /////////////////////////////////////////////////////////////////////////// // CharLiteral template<typename Char> struct CharLiteral; /////////////////////////////////////////////////////////////////////////// // ListSet template<typename Char> struct ListSet; /////////////////////////////////////////////////////////////////////////// // as_repeat template<typename Char, typename Gram, typename Greedy> struct as_repeat : if_< make<detail::use_simple_repeat<_child, Char> > , as_simple_quantifier<Gram, Greedy> , as_default_quantifier<Greedy> > {}; /////////////////////////////////////////////////////////////////////////// // NonGreedyRepeatCases template<typename Gram> struct NonGreedyRepeatCases { template<typename Tag, typename Dummy = void> struct case_ : not_<_> {}; template<typename Dummy> struct case_<tag::dereference, Dummy> : dereference<Gram> {}; template<typename Dummy> struct case_<tag::unary_plus, Dummy> : unary_plus<Gram> {}; template<typename Dummy> struct case_<tag::logical_not, Dummy> : logical_not<Gram> {}; template<uint_t Min, uint_t Max, typename Dummy> struct case_<detail::generic_quant_tag<Min, Max>, Dummy> : unary_expr<detail::generic_quant_tag<Min, Max>, Gram> {}; }; /////////////////////////////////////////////////////////////////////////// // InvertibleCases template<typename Char, typename Gram> struct InvertibleCases { template<typename Tag, typename Dummy = void> struct case_ : not_<_> {}; template<typename Dummy> struct case_<tag::comma, Dummy> : when<ListSet<Char>, as_list_set_matcher<Char> > {}; template<typename Dummy> struct case_<tag::assign, Dummy> : when<ListSet<Char>, as_list_set_matcher<Char> > {}; template<typename Dummy> struct case_<tag::subscript, Dummy> : when<subscript<detail::set_initializer_type, Gram>, call<as_set_matcher<Gram>(_right)> > {}; template<typename Dummy> struct case_<detail::lookahead_tag, Dummy> : when< unary_expr<detail::lookahead_tag, Gram> , as_lookahead<Gram> > {}; template<typename Dummy> struct case_<detail::lookbehind_tag, Dummy> : when< unary_expr<detail::lookbehind_tag, Gram> , as_lookbehind<Gram> > {}; template<typename Dummy> struct case_<tag::terminal, Dummy> : when< or_< CharLiteral<Char> , terminal<detail::posix_charset_placeholder> , terminal<detail::range_placeholder<_> > , terminal<detail::logical_newline_placeholder> , terminal<detail::assert_word_placeholder<detail::word_boundary<mpl::true_> > > > , as_matcher > {}; }; /////////////////////////////////////////////////////////////////////////// // Cases template<typename Char, typename Gram> struct Cases { template<typename Tag, typename Dummy = void> struct case_ : not_<_> {}; template<typename Dummy> struct case_<tag::terminal, Dummy> : when< _ , in_sequence<as_matcher> > {}; template<typename Dummy> struct case_<tag::shift_right, Dummy> : when< shift_right<Gram, Gram> , reverse_fold<_, _state, Gram> > {}; template<typename Dummy> struct case_<tag::bitwise_or, Dummy> : when< bitwise_or<Gram, Gram> , in_sequence< as_alternate_matcher< reverse_fold_tree<_, make<fusion::nil>, in_alternate_list<Gram> > > > > {}; template<typename Dummy, typename Greedy> struct case_<optional_tag<Greedy> , Dummy> : when< unary_expr<optional_tag<Greedy>, Gram> , in_sequence<call<as_optional<Gram, Greedy>(_child)> > > {}; template<typename Dummy> struct case_<tag::dereference, Dummy> : when< dereference<Gram> , call<Gram(as_repeat<Char, Gram, mpl::true_>)> > {}; template<typename Dummy> struct case_<tag::unary_plus, Dummy> : when< unary_plus<Gram> , call<Gram(as_repeat<Char, Gram, mpl::true_>)> > {}; template<typename Dummy> struct case_<tag::logical_not, Dummy> : when< logical_not<Gram> , call<Gram(as_repeat<Char, Gram, mpl::true_>)> > {}; template<uint_t Min, uint_t Max, typename Dummy> struct case_<detail::generic_quant_tag<Min, Max>, Dummy> : when< unary_expr<detail::generic_quant_tag<Min, Max>, Gram> , call<Gram(as_repeat<Char, Gram, mpl::true_>)> > {}; template<typename Dummy> struct case_<tag::negate, Dummy> : when< negate<switch_<NonGreedyRepeatCases<Gram> > > , call<Gram(call<as_repeat<Char, Gram, mpl::false_>(_child)>)> > {}; template<typename Dummy> struct case_<tag::complement, Dummy> : when< complement<switch_<InvertibleCases<Char, Gram> > > , in_sequence<call<as_inverse(call<switch_<InvertibleCases<Char, Gram> >(_child)>)> > > {}; template<typename Dummy> struct case_<detail::modifier_tag, Dummy> : when<binary_expr<detail::modifier_tag, _, Gram>, as_modifier<Gram> > {}; template<typename Dummy> struct case_<detail::lookahead_tag, Dummy> : when< unary_expr<detail::lookahead_tag, Gram> , in_sequence<as_lookahead<Gram> > > {}; template<typename Dummy> struct case_<detail::lookbehind_tag, Dummy> : when< unary_expr<detail::lookbehind_tag, Gram> , in_sequence<as_lookbehind<Gram> > > {}; template<typename Dummy> struct case_<detail::keeper_tag, Dummy> : when< unary_expr<detail::keeper_tag, Gram> , in_sequence<as_keeper<Gram> > > {}; template<typename Dummy> struct case_<tag::comma, Dummy> : when<ListSet<Char>, in_sequence<as_list_set_matcher<Char> > > {}; template<typename Dummy> struct case_<tag::assign, Dummy> : or_< when<assign<detail::basic_mark_tag, Gram>, call<Gram(as_marker)> > , when<ListSet<Char>, in_sequence<as_list_set_matcher<Char> > > > {}; template<typename Dummy> struct case_<tag::subscript, Dummy> : or_< when<subscript<detail::set_initializer_type, Gram>, in_sequence<call<as_set_matcher<Gram>(_right)> > > , when<subscript<ActionableGrammar<Char>, _>, call<ActionableGrammar<Char>(as_action)> > > {}; }; /////////////////////////////////////////////////////////////////////////// // ActionableCases template<typename Char, typename Gram> struct ActionableCases { template<typename Tag, typename Dummy = void> struct case_ : Cases<Char, Gram>::template case_<Tag> {}; // Only in sub-expressions with actions attached do we allow attribute assignements template<typename Dummy> struct case_<proto::tag::assign, Dummy> : or_< typename Cases<Char, Gram>::template case_<proto::tag::assign> , when<proto::assign<terminal<detail::attribute_placeholder<_> >, _>, in_sequence<as_attr_matcher> > > {}; }; } // namespace detail /////////////////////////////////////////////////////////////////////////// // Grammar template<typename Char> struct Grammar : proto::switch_<grammar_detail::Cases<Char, Grammar<Char> > > {}; template<typename Char> struct ActionableGrammar : proto::switch_<grammar_detail::ActionableCases<Char, ActionableGrammar<Char> > > {}; /////////////////////////////////////////////////////////////////////////// // INVALID_REGULAR_EXPRESSION struct INVALID_REGULAR_EXPRESSION : mpl::false_ {}; /////////////////////////////////////////////////////////////////////////// // is_valid_regex template<typename Expr, typename Char> struct is_valid_regex : proto::matches<Expr, Grammar<Char> > {}; }} // namespace boost::xpressive #endif