// 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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#ifndef BOOST_SPIRIT_LEX_LEXER_ACTION_HPP
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#define BOOST_SPIRIT_LEX_LEXER_ACTION_HPP
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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/lex/meta_compiler.hpp>
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#include <boost/spirit/home/lex/lexer_type.hpp>
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#include <boost/spirit/home/lex/argument.hpp>
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#include <boost/spirit/home/lex/lexer/support_functions.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/is_same.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit { namespace lex
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{
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///////////////////////////////////////////////////////////////////////////
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template <typename Subject, typename Action>
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struct action : unary_lexer<action<Subject, Action> >
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{
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action(Subject const& subject, Action f)
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: subject(subject), f(f) {}
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template <typename LexerDef, typename String>
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void collect(LexerDef& lexdef, String const& state
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, String const& targetstate) const
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{
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// collect the token definition information for the token_def
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// this action is attached to
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subject.collect(lexdef, state, targetstate);
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}
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template <typename LexerDef>
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void add_actions(LexerDef& lexdef) const
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{
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// call to add all actions attached further down the hierarchy
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subject.add_actions(lexdef);
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// retrieve the id of the associated token_def and register the
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// given semantic action with the lexer instance
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lexdef.add_action(subject.unique_id(), subject.state(), f);
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}
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Subject subject;
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Action f;
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// silence MSVC warning C4512: assignment operator could not be generated
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BOOST_DELETED_FUNCTION(action& operator= (action const&))
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};
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}}}
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// Karma action meta-compiler
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template <>
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struct make_component<lex::domain, tag::action>
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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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remove_const<typename Elements::car_type>::type
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subject_type;
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typedef typename
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remove_const<typename Elements::cdr_type::car_type>::type
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action_type;
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typedef lex::action<subject_type, action_type> type;
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};
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template <typename Elements>
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typename result<make_component(Elements, unused_type)>::type
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operator()(Elements const& elements, unused_type) const
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{
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typename result<make_component(Elements, unused_type)>::type
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result(elements.car, elements.cdr.car);
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return result;
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}
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};
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}}
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#endif
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