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/*=============================================================================
Copyright (c) 2001-2014 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_LEXEME_MARCH_24_2007_0802AM)
#define SPIRIT_LEXEME_MARCH_24_2007_0802AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/x3/support/context.hpp>
#include <boost/spirit/home/x3/support/unused.hpp>
#include <boost/spirit/home/x3/core/skip_over.hpp>
#include <boost/spirit/home/x3/core/parser.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/utility/enable_if.hpp>
namespace boost { namespace spirit { namespace x3
{
template <typename Subject>
struct lexeme_directive : unary_parser<Subject, lexeme_directive<Subject>>
{
typedef unary_parser<Subject, lexeme_directive<Subject> > base_type;
static bool const is_pass_through_unary = true;
static bool const handles_container = Subject::handles_container;
lexeme_directive(Subject const& subject)
: base_type(subject) {}
template <typename Iterator, typename Context
, typename RContext, typename Attribute>
typename enable_if<has_skipper<Context>, bool>::type
parse(Iterator& first, Iterator const& last
, Context const& context, RContext& rcontext, Attribute& attr) const
{
x3::skip_over(first, last, context);
auto const& skipper = x3::get<skipper_tag>(context);
typedef unused_skipper<
typename remove_reference<decltype(skipper)>::type>
unused_skipper_type;
unused_skipper_type unused_skipper(skipper);
return this->subject.parse(
first, last
, make_context<skipper_tag>(unused_skipper, context)
, rcontext
, attr);
}
template <typename Iterator, typename Context
, typename RContext, typename Attribute>
typename disable_if<has_skipper<Context>, bool>::type
parse(Iterator& first, Iterator const& last
, Context const& context, RContext& rcontext, Attribute& attr) const
{
// no need to pre-skip if skipper is unused
//- x3::skip_over(first, last, context);
return this->subject.parse(
first, last
, context
, rcontext
, attr);
}
};
struct lexeme_gen
{
template <typename Subject>
lexeme_directive<typename extension::as_parser<Subject>::value_type>
operator[](Subject const& subject) const
{
return {as_parser(subject)};
}
};
lexeme_gen const lexeme = lexeme_gen();
}}}
#endif
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