276 lines
8.0 KiB
C++
276 lines
8.0 KiB
C++
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// 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/proto/tags.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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