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/*=============================================================================
Copyright (c) 1998-2003 Joel de Guzman
Copyright (c) 2001 Daniel Nuffer
Copyright (c) 2002 Hartmut Kaiser
http://spirit.sourceforge.net/
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(BOOST_SPIRIT_KLEENE_STAR_HPP)
#define BOOST_SPIRIT_KLEENE_STAR_HPP
#include <boost/spirit/home/classic/namespace.hpp>
#include <boost/spirit/home/classic/core/parser.hpp>
#include <boost/spirit/home/classic/core/primitives/primitives.hpp>
#include <boost/spirit/home/classic/core/composite/composite.hpp>
#include <boost/spirit/home/classic/meta/as_parser.hpp>
namespace boost { namespace spirit {
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////
//
// kleene_star class
//
// Handles expressions of the form:
//
// *a
//
// where a is a parser. The expression returns a composite
// parser that matches its subject zero (0) or more times.
//
///////////////////////////////////////////////////////////////////////////
struct kleene_star_parser_gen;
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(push)
#pragma warning(disable:4512) //assignment operator could not be generated
#endif
template <typename S>
struct kleene_star
: public unary<S, parser<kleene_star<S> > >
{
typedef kleene_star<S> self_t;
typedef unary_parser_category parser_category_t;
typedef kleene_star_parser_gen parser_generator_t;
typedef unary<S, parser<self_t> > base_t;
kleene_star(S const& a)
: base_t(a) {}
template <typename ScannerT>
typename parser_result<self_t, ScannerT>::type
parse(ScannerT const& scan) const
{
typedef typename parser_result<self_t, ScannerT>::type result_t;
typedef typename ScannerT::iterator_t iterator_t;
result_t hit = scan.empty_match();
for (;;)
{
iterator_t save = scan.first;
if (result_t next = this->subject().parse(scan))
{
scan.concat_match(hit, next);
}
else
{
scan.first = save;
return hit;
}
}
}
};
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(pop)
#endif
struct kleene_star_parser_gen
{
template <typename S>
struct result
{
typedef kleene_star<S> type;
};
template <typename S>
static kleene_star<S>
generate(parser<S> const& a)
{
return kleene_star<S>(a.derived());
}
};
//////////////////////////////////
template <typename S>
kleene_star<S>
operator*(parser<S> const& a);
BOOST_SPIRIT_CLASSIC_NAMESPACE_END
}} // namespace BOOST_SPIRIT_CLASSIC_NS
#endif
#include <boost/spirit/home/classic/core/composite/impl/kleene_star.ipp>
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