/*=============================================================================
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Copyright (c) 2002-2003 Joel de Guzman
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Copyright (c) 2002-2003 Hartmut Kaiser
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Copyright (c) 2003 Martin Wille
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http://spirit.sourceforge.net/
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined(BOOST_SPIRIT_PARSER_TRAITS_HPP)
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#define BOOST_SPIRIT_PARSER_TRAITS_HPP
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#include <boost/type_traits/is_base_and_derived.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core/parser.hpp>
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#include <boost/spirit/home/classic/meta/impl/parser_traits.ipp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////////
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//
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// Parser traits templates
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//
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// Used to determine the type and several other characteristics of a given
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// parser type.
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//
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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//
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// The is_parser traits template can be used to tell wether a given
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// class is a parser.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct is_parser
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{
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BOOST_STATIC_CONSTANT(bool, value =
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(::boost::is_base_and_derived<parser<T>, T>::value));
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// [JDG 2/3/03] simplified implementation by
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// using boost::is_base_and_derived
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The is_unary_composite traits template can be used to tell if a given
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// parser is a unary parser as for instance kleene_star or optional.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename UnaryT>
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struct is_unary_composite {
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BOOST_STATIC_CONSTANT(bool, value = (::boost::is_convertible<
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typename UnaryT::parser_category_t, unary_parser_category>::value));
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The is_acction_parser traits template can be used to tell if a given
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// parser is a action parser, i.e. it is a composite consisting of a
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// auxiliary parser and an attached semantic action.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename ActionT>
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struct is_action_parser {
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BOOST_STATIC_CONSTANT(bool, value = (::boost::is_convertible<
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typename ActionT::parser_category_t, action_parser_category>::value));
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The is_binary_composite traits template can be used to tell if a given
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// parser is a binary parser as for instance sequence or difference.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename BinaryT>
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struct is_binary_composite {
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BOOST_STATIC_CONSTANT(bool, value = (::boost::is_convertible<
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typename BinaryT::parser_category_t, binary_parser_category>::value));
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The is_composite_parser traits template can be used to tell if a given
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// parser is a unary or a binary parser composite type.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename CompositeT>
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struct is_composite_parser {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::is_unary_composite<CompositeT>::value ||
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::BOOST_SPIRIT_CLASSIC_NS::is_binary_composite<CompositeT>::value));
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};
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///////////////////////////////////////////////////////////////////////////////
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template <typename ParserT>
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struct is_alternative {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_alternative));
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};
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template <typename ParserT>
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struct is_sequence {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_sequence));
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};
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template <typename ParserT>
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struct is_sequential_or {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_sequential_or));
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};
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template <typename ParserT>
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struct is_intersection {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_intersection));
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};
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template <typename ParserT>
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struct is_difference {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_difference));
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};
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template <typename ParserT>
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struct is_exclusive_or {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_exclusive_or));
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};
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template <typename ParserT>
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struct is_optional {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_optional));
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};
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template <typename ParserT>
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struct is_kleene_star {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_kleene_star));
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};
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template <typename ParserT>
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struct is_positive {
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BOOST_STATIC_CONSTANT(bool, value = (
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::BOOST_SPIRIT_CLASSIC_NS::impl::parser_type_traits<ParserT>::is_positive));
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// Parser extraction templates
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//
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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//
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// The unary_subject template can be used to return the type of the
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// parser used as the subject of an unary parser.
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// If the parser under inspection is not an unary type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename UnaryT>
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struct unary_subject {
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BOOST_STATIC_ASSERT(BOOST_SPIRIT_CLASSIC_NS::is_unary_composite<UnaryT>::value);
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typedef typename UnaryT::subject_t type;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The get_unary_subject template function returns the parser object, which
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// is used as the subject of an unary parser.
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// If the parser under inspection is not an unary type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename UnaryT>
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inline typename unary_subject<UnaryT>::type const &
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get_unary_subject(UnaryT const &unary_)
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{
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_unary_composite<UnaryT>::value);
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return unary_.subject();
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// The binary_left_subject and binary_right_subject templates can be used to
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// return the types of the parsers used as the left and right subject of an
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// binary parser.
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// If the parser under inspection is not a binary type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename BinaryT>
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struct binary_left_subject {
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_binary_composite<BinaryT>::value);
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typedef typename BinaryT::left_t type;
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};
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template <typename BinaryT>
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struct binary_right_subject {
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_binary_composite<BinaryT>::value);
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typedef typename BinaryT::right_t type;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The get_binary_left_subject and get_binary_right_subject template functions
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// return the parser object, which is used as the left or right subject of a
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// binary parser.
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// If the parser under inspection is not a binary type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename BinaryT>
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inline typename binary_left_subject<BinaryT>::type const &
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get_binary_left_subject(BinaryT const &binary_)
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{
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_binary_composite<BinaryT>::value);
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return binary_.left();
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}
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template <typename BinaryT>
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inline typename binary_right_subject<BinaryT>::type const &
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get_binary_right_subject(BinaryT const &binary_)
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{
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_binary_composite<BinaryT>::value);
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return binary_.right();
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// The action_subject template can be used to return the type of the
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// parser used as the subject of an action parser.
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// If the parser under inspection is not an action type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename ActionT>
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struct action_subject {
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_action_parser<ActionT>::value);
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typedef typename ActionT::subject_t type;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The get_action_subject template function returns the parser object, which
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// is used as the subject of an action parser.
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// If the parser under inspection is not an action type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename ActionT>
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inline typename action_subject<ActionT>::type const &
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get_action_subject(ActionT const &action_)
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{
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_action_parser<ActionT>::value);
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return action_.subject();
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// The semantic_action template can be used to return the type of the
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// attached semantic action of an action parser.
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// If the parser under inspection is not an action type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename ActionT>
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struct semantic_action {
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_action_parser<ActionT>::value);
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typedef typename ActionT::predicate_t type;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// The get_semantic_action template function returns the attached semantic
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// action of an action parser.
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// If the parser under inspection is not an action type parser the compilation
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// will fail.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename ActionT>
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inline typename semantic_action<ActionT>::type const &
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get_semantic_action(ActionT const &action_)
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{
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BOOST_STATIC_ASSERT(::BOOST_SPIRIT_CLASSIC_NS::is_action_parser<ActionT>::value);
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return action_.predicate();
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}
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///////////////////////////////////////////////////////////////////////////////
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif // !defined(BOOST_SPIRIT_PARSER_TRAITS_HPP)
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