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// Copyright (c) 2001-2011 Hartmut Kaiser
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#if !defined(SPIRIT_LEX_ACTION_NOV_18_2007_0743PM)
#define SPIRIT_LEX_ACTION_NOV_18_2007_0743PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/lex/meta_compiler.hpp>
#include <boost/spirit/home/lex/lexer_type.hpp>
#include <boost/spirit/home/lex/argument.hpp>
#include <boost/spirit/home/lex/lexer/support_functions.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/is_same.hpp>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit { namespace lex
{
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename Action>
struct action : unary_lexer<action<Subject, Action> >
{
action(Subject const& subject, Action f)
: subject(subject), f(f) {}
template <typename LexerDef, typename String>
void collect(LexerDef& lexdef, String const& state
, String const& targetstate) const
{
// collect the token definition information for the token_def
// this action is attached to
subject.collect(lexdef, state, targetstate);
}
template <typename LexerDef>
void add_actions(LexerDef& lexdef) const
{
// call to add all actions attached further down the hierarchy
subject.add_actions(lexdef);
// retrieve the id of the associated token_def and register the
// given semantic action with the lexer instance
lexdef.add_action(subject.unique_id(), subject.state(), f);
}
Subject subject;
Action f;
private:
// silence MSVC warning C4512: assignment operator could not be generated
action& operator= (action const&);
};
}}}
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Karma action meta-compiler
template <>
struct make_component<lex::domain, tag::action>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename
remove_const<typename Elements::car_type>::type
subject_type;
typedef typename
remove_const<typename Elements::cdr_type::car_type>::type
action_type;
typedef lex::action<subject_type, action_type> type;
};
template <typename Elements>
typename result<make_component(Elements, unused_type)>::type
operator()(Elements const& elements, unused_type) const
{
typename result<make_component(Elements, unused_type)>::type
result(elements.car, elements.cdr.car);
return result;
}
};
}}
#endif
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