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274 lines
7.9 KiB
274 lines
7.9 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
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// |
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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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#if !defined(BOOST_SPIRIT_QI_META_CREATE_NOV_21_2009_0432PM) |
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#define BOOST_SPIRIT_QI_META_CREATE_NOV_21_2009_0432PM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/qi/domain.hpp> |
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#include <boost/spirit/home/support/common_terminals.hpp> |
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#include <boost/spirit/home/support/auto/meta_create.hpp> |
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#include <boost/utility/enable_if.hpp> |
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#include <boost/variant.hpp> |
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#include <boost/optional.hpp> |
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#include <boost/config.hpp> |
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#include <boost/mpl/and.hpp> |
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#include <boost/mpl/not.hpp> |
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#include <boost/mpl/fold.hpp> |
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#include <boost/mpl/vector.hpp> |
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#include <boost/mpl/push_back.hpp> |
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#include <boost/type_traits/is_same.hpp> |
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#include <boost/fusion/include/as_vector.hpp> |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace qi |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// compatible STL containers |
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template <typename Container> |
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struct meta_create_container |
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{ |
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typedef make_unary_proto_expr< |
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typename Container::value_type |
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, proto::tag::dereference, qi::domain |
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> make_proto_expr; |
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typedef typename make_proto_expr::type type; |
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static type call() |
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{ |
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return make_proto_expr::call(); |
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} |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// Fusion sequences |
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template <typename Sequence> |
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struct meta_create_sequence |
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{ |
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// create a mpl sequence from the given fusion sequence |
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typedef typename mpl::fold< |
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typename fusion::result_of::as_vector<Sequence>::type |
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, mpl::vector<>, mpl::push_back<mpl::_, mpl::_> |
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>::type sequence_type; |
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typedef make_nary_proto_expr< |
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sequence_type, proto::tag::shift_right, qi::domain |
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> make_proto_expr; |
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typedef typename make_proto_expr::type type; |
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static type call() |
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{ |
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return make_proto_expr::call(); |
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} |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// the default is to use the standard streaming operator unless it's a |
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// STL container or a fusion sequence |
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// The default implementation will be chosen if no predefined mapping of |
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// the data type T to a Qi component is defined. |
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struct no_auto_mapping_exists {}; |
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template <typename T, typename Enable = void> |
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struct meta_create_impl : mpl::identity<no_auto_mapping_exists> {}; |
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template <typename T> |
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struct meta_create_impl<T |
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, typename enable_if<mpl::and_< |
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traits::is_container<T>, mpl::not_<traits::is_string<T> > > |
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>::type> |
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: meta_create_container<T> {}; |
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template <typename T> |
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struct meta_create_impl<T, typename enable_if< |
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spirit::detail::is_fusion_sequence_but_not_proto_expr<T> |
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>::type> |
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: meta_create_sequence<T> {}; |
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template <typename T, typename Enable = void> |
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struct meta_create : meta_create_impl<T> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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// optional |
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template <typename T> |
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struct meta_create<boost::optional<T> > |
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{ |
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typedef make_unary_proto_expr< |
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T, proto::tag::negate, qi::domain |
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> make_proto_expr; |
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typedef typename make_proto_expr::type type; |
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static type call() |
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{ |
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return make_proto_expr::call(); |
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} |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// alternatives |
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)> |
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struct meta_create<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> > |
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{ |
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typedef make_nary_proto_expr< |
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typename boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types |
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, proto::tag::bitwise_or, qi::domain |
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> make_proto_expr; |
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typedef typename make_proto_expr::type type; |
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static type call() |
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{ |
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return make_proto_expr::call(); |
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} |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// predefined specializations for primitive components |
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// character generator |
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template <> |
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struct meta_create<char> |
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{ |
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typedef spirit::standard::char_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<signed char> |
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{ |
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typedef spirit::standard::char_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<wchar_t> |
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{ |
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typedef spirit::standard_wide::char_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<unsigned char> |
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{ |
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typedef spirit::standard::char_type type; |
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static type call() { return type(); } |
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}; |
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// boolean generator |
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template <> |
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struct meta_create<bool> |
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{ |
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typedef spirit::bool_type type; |
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static type call() { return type(); } |
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}; |
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// integral generators |
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template <> |
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struct meta_create<int> |
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{ |
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typedef spirit::int_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<short> |
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{ |
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typedef spirit::short_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<long> |
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{ |
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typedef spirit::long_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<unsigned int> |
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{ |
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typedef spirit::uint_type type; |
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static type call() { return type(); } |
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}; |
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#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) |
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template <> |
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struct meta_create<unsigned short> |
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{ |
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typedef spirit::ushort_type type; |
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static type call() { return type(); } |
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}; |
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#endif |
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template <> |
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struct meta_create<unsigned long> |
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{ |
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typedef spirit::ulong_type type; |
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static type call() { return type(); } |
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}; |
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#ifdef BOOST_HAS_LONG_LONG |
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template <> |
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struct meta_create<boost::long_long_type> |
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{ |
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typedef spirit::long_long_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<boost::ulong_long_type> |
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{ |
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typedef spirit::ulong_long_type type; |
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static type call() { return type(); } |
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}; |
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#endif |
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// floating point generators |
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template <> |
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struct meta_create<float> |
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{ |
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typedef spirit::float_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<double> |
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{ |
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typedef spirit::double_type type; |
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static type call() { return type(); } |
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}; |
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template <> |
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struct meta_create<long double> |
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{ |
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typedef spirit::long_double_type type; |
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static type call() { return type(); } |
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}; |
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}}} |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// main customization point for create_parser |
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template <typename T, typename Enable = void> |
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struct create_parser : qi::meta_create<T> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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// dispatch this to the Qi related specializations |
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template <typename T> |
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struct meta_create<qi::domain, T> |
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: create_parser<typename spirit::detail::remove_const_ref<T>::type> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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// Check whether a valid mapping exits for the given data type to a Qi |
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// component |
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template <typename T> |
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struct meta_create_exists<qi::domain, T> |
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: mpl::not_<is_same< |
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qi::no_auto_mapping_exists |
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, typename meta_create<qi::domain, T>::type |
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> > {}; |
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}}} |
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#endif
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