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104 lines
3.2 KiB
104 lines
3.2 KiB
// 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/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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