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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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_ACTION_JANUARY_07_2007_1128AM)
#define SPIRIT_ACTION_JANUARY_07_2007_1128AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/qi/meta_compiler.hpp>
#include <boost/spirit/home/qi/parser.hpp>
#include <boost/spirit/home/qi/detail/attributes.hpp>
#include <boost/spirit/home/support/argument.hpp>
#include <boost/spirit/home/support/context.hpp>
#include <boost/spirit/home/support/unused.hpp>
#include <boost/spirit/home/support/info.hpp>
#include <boost/spirit/home/support/action_dispatch.hpp>
#include <boost/spirit/home/support/handles_container.hpp>
#include <boost/mpl/bool.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 qi
{
BOOST_PP_REPEAT(SPIRIT_ARGUMENTS_LIMIT, SPIRIT_USING_ARGUMENT, _)
template <typename Subject, typename Action>
struct action : unary_parser<action<Subject, Action> >
{
typedef Subject subject_type;
typedef Action action_type;
template <typename Context, typename Iterator>
struct attribute
: traits::attribute_of<Subject, Context, Iterator>
{};
action(Subject const& subject, Action f)
: subject(subject), f(f) {}
#ifndef BOOST_SPIRIT_ACTIONS_ALLOW_ATTR_COMPAT
template <typename Iterator, typename Context
, typename Skipper, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context& context, Skipper const& skipper
, Attribute& attr_) const
{
typedef typename attribute<Context, Iterator>::type attr_type;
typedef traits::make_attribute<attr_type, Attribute> make_attribute;
// create an attribute if one is not supplied
typedef traits::transform_attribute<
typename make_attribute::type, attr_type, domain> transform;
typename make_attribute::type made_attr = make_attribute::call(attr_);
typename transform::type attr = transform::pre(made_attr);
Iterator save = first;
if (subject.parse(first, last, context, skipper, attr))
{
// call the function, passing the attribute, the context.
// The client can return false to fail parsing.
if (traits::action_dispatch<Subject>()(f, attr, context))
{
// Do up-stream transformation, this integrates the results
// back into the original attribute value, if appropriate.
traits::post_transform(attr_, attr);
return true;
}
// reset iterators if semantic action failed the match
// retrospectively
first = save;
}
return false;
}
#else
template <typename Iterator, typename Context
, typename Skipper, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context& context, Skipper const& skipper
, Attribute& attr) const
{
Iterator save = first;
if (subject.parse(first, last, context, skipper, attr)) // Use the attribute as-is
{
// call the function, passing the attribute, the context.
// The client can return false to fail parsing.
if (traits::action_dispatch<Subject>()(f, attr, context))
return true;
// reset iterators if semantic action failed the match
// retrospectively
first = save;
}
return false;
}
template <typename Iterator, typename Context
, typename Skipper>
bool parse(Iterator& first, Iterator const& last
, Context& context, Skipper const& skipper
, unused_type) const
{
typedef typename attribute<Context, Iterator>::type attr_type;
typedef traits::make_attribute<attr_type, unused_type> make_attribute;
// synthesize the attribute since one is not supplied
typedef traits::transform_attribute<
typename make_attribute::type, attr_type, domain> transform;
typename make_attribute::type made_attr = make_attribute::call(unused_type());
typename transform::type attr = transform::pre(made_attr);
Iterator save = first;
if (subject.parse(first, last, context, skipper, attr))
{
// call the function, passing the attribute, the context.
// The client can return false to fail parsing.
if (traits::action_dispatch<Subject>()(f, attr, context))
return true;
// reset iterators if semantic action failed the match
// retrospectively
first = save;
}
return false;
}
#endif
template <typename Context>
info what(Context& context) const
{
// the action is transparent (does not add any info)
return subject.what(context);
}
Subject subject;
Action f;
private:
// silence MSVC warning C4512: assignment operator could not be generated
action& operator= (action const&);
};
}}}
namespace boost { namespace spirit
{
// Qi action meta-compiler
template <>
struct make_component<qi::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 qi::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;
}
};
}}
namespace boost { namespace spirit { namespace traits
{
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename Action>
struct has_semantic_action<qi::action<Subject, Action> >
: mpl::true_ {};
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename Action, typename Attribute
, typename Context, typename Iterator>
struct handles_container<qi::action<Subject, Action>, Attribute
, Context, Iterator>
: unary_handles_container<Subject, Attribute, Context, Iterator> {};
}}}
#endif
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