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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_SKIP_JANUARY_26_2008_0422PM)
#define SPIRIT_SKIP_JANUARY_26_2008_0422PM
#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/auxiliary/lazy.hpp>
#include <boost/spirit/home/qi/operator/kleene.hpp>
#include <boost/spirit/home/qi/directive/lexeme.hpp>
#include <boost/spirit/home/qi/skip_over.hpp>
#include <boost/spirit/home/qi/detail/unused_skipper.hpp>
#include <boost/spirit/home/support/container.hpp>
#include <boost/spirit/home/support/common_terminals.hpp>
#include <boost/spirit/home/qi/detail/attributes.hpp>
#include <boost/spirit/home/support/info.hpp>
#include <boost/spirit/home/support/has_semantic_action.hpp>
#include <boost/spirit/home/support/handles_container.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/fusion/include/vector.hpp>
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Enablers
///////////////////////////////////////////////////////////////////////////
template <>
struct use_directive<qi::domain, tag::skip> // enables skip[p]
: mpl::true_ {};
template <typename T>
struct use_directive<qi::domain
, terminal_ex<tag::skip // enables skip(s)[p]
, fusion::vector1<T> >
> : boost::spirit::traits::matches<qi::domain, T> {};
template <> // enables *lazy* skip(s)[p]
struct use_lazy_directive<
qi::domain
, tag::skip
, 1 // arity
> : mpl::true_ {};
}}
namespace boost { namespace spirit { namespace qi
{
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
using spirit::skip;
#endif
using spirit::skip_type;
template <typename Subject>
struct reskip_parser : unary_parser<reskip_parser<Subject> >
{
typedef Subject subject_type;
template <typename Context, typename Iterator>
struct attribute
{
typedef typename
traits::attribute_of<Subject, Context, Iterator>::type
type;
};
reskip_parser(Subject const& subject)
: subject(subject) {}
template <typename Iterator, typename Context
, typename Skipper, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context& context, Skipper const& u // --> The skipper is reintroduced
, Attribute& attr) const
{
return subject.parse(first, last, context
, detail::get_skipper(u), attr);
}
template <typename Context>
info what(Context& context) const
{
return info("skip", subject.what(context));
}
Subject subject;
};
template <typename Subject, typename Skipper>
struct skip_parser : unary_parser<skip_parser<Subject, Skipper> >
{
typedef Subject subject_type;
typedef Skipper skipper_type;
template <typename Context, typename Iterator>
struct attribute
{
typedef typename
traits::attribute_of<Subject, Context, Iterator>::type
type;
};
skip_parser(Subject const& subject, Skipper const& skipper)
: subject(subject), skipper(skipper) {}
template <typename Iterator, typename Context
, typename Skipper_, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context& context, Skipper_ const& //skipper --> bypass the supplied skipper
, Attribute& attr) const
{
return subject.parse(first, last, context, skipper, attr);
}
template <typename Context>
info what(Context& context) const
{
return info("skip", subject.what(context));
}
Subject subject;
Skipper skipper;
};
///////////////////////////////////////////////////////////////////////////
// Parser generators: make_xxx function (objects)
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename Modifiers>
struct make_directive<tag::skip, Subject, Modifiers>
{
typedef reskip_parser<Subject> result_type;
result_type operator()(unused_type, Subject const& subject, unused_type) const
{
return result_type(subject);
}
};
template <typename Skipper, typename Subject, typename Modifiers>
struct make_directive<
terminal_ex<tag::skip, fusion::vector1<Skipper> >, Subject, Modifiers>
{
typedef typename
result_of::compile<qi::domain, Skipper, Modifiers>::type
skipper_type;
typedef skip_parser<Subject, skipper_type> result_type;
template <typename Terminal>
result_type operator()(Terminal const& term, Subject const& subject
, Modifiers const& modifiers) const
{
return result_type(subject
, compile<qi::domain>(fusion::at_c<0>(term.args), modifiers));
}
};
}}}
namespace boost { namespace spirit { namespace traits
{
///////////////////////////////////////////////////////////////////////////
template <typename Subject>
struct has_semantic_action<qi::reskip_parser<Subject> >
: unary_has_semantic_action<Subject> {};
template <typename Subject, typename Skipper>
struct has_semantic_action<qi::skip_parser<Subject, Skipper> >
: unary_has_semantic_action<Subject> {};
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename Attribute, typename Context
, typename Iterator>
struct handles_container<qi::reskip_parser<Subject>, Attribute
, Context, Iterator>
: unary_handles_container<Subject, Attribute, Context, Iterator> {};
template <typename Subject, typename Skipper, typename Attribute
, typename Context, typename Iterator>
struct handles_container<qi::skip_parser<Subject, Skipper>, Attribute
, Context, Iterator>
: unary_handles_container<Subject, Attribute, Context, Iterator> {};
}}}
#endif
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