97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
|
// 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)
|
||
|
|
|
||
|
|
#ifndef BOOST_SPIRIT_LEX_LEXER_ACTION_HPP
|
||
|
|
#define BOOST_SPIRIT_LEX_LEXER_ACTION_HPP
|
||
|
|
|
||
|
|
#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;
|
||
|
|
|
||
|
|
// silence MSVC warning C4512: assignment operator could not be generated
|
||
|
|
BOOST_DELETED_FUNCTION(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
|