106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
// Copyright (c) 2001-2011 Hartmut Kaiser
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// Copyright (c) 2001-2011 Joel de Guzman
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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_LEX_META_COMPILER_APR_20_2009_0756PM)
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#define BOOST_SPIRIT_LEX_META_COMPILER_APR_20_2009_0756PM
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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/support/meta_compiler.hpp>
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#include <boost/spirit/home/lex/domain.hpp>
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#include <boost/spirit/home/lex/lexer_type.hpp>
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#include <boost/proto/tags.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace spirit
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{
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template <typename T>
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struct use_terminal<lex::domain, T
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, typename enable_if<traits::is_lexer<T> >::type> // enables lexers
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: mpl::true_ {};
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namespace lex
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{
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template <typename T, typename Modifiers, typename Enable = void>
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struct make_primitive // by default, return it as-is
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{
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typedef T result_type;
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template <typename T_>
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T_& operator()(T_& val, unused_type) const
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{
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return val;
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}
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template <typename T_>
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T_ const& operator()(T_ const& val, unused_type) const
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{
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return val;
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}
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};
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template <typename Tag, typename Elements
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, typename Modifiers, typename Enable = void>
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struct make_composite;
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}
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// Lex primitive meta-compiler
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template <>
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struct make_component<lex::domain, proto::tag::terminal>
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{
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template <typename Sig>
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struct result;
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template <typename This, typename Elements, typename Modifiers>
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struct result<This(Elements, Modifiers)>
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{
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typedef typename lex::make_primitive<
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typename remove_const<typename Elements::car_type>::type,
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typename remove_reference<Modifiers>::type>::result_type
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type;
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};
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template <typename Elements, typename Modifiers>
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typename result<make_component(Elements, Modifiers)>::type
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operator()(Elements const& elements, Modifiers const& modifiers) const
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{
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typedef typename remove_const<typename Elements::car_type>::type term;
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return lex::make_primitive<term, Modifiers>()(elements.car, modifiers);
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}
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};
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// Lex composite meta-compiler
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template <typename Tag>
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struct make_component<lex::domain, Tag>
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{
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template <typename Sig>
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struct result;
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template <typename This, typename Elements, typename Modifiers>
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struct result<This(Elements, Modifiers)>
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{
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typedef typename
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lex::make_composite<Tag, Elements
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, typename remove_reference<Modifiers>::type>::result_type
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type;
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};
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template <typename Elements, typename Modifiers>
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typename result<make_component(Elements, Modifiers)>::type
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operator()(Elements const& elements, Modifiers const& modifiers) const
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{
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return lex::make_composite<Tag, Elements, Modifiers>()(
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elements, modifiers);
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}
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};
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}}
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#endif
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