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/*=============================================================================
Copyright (c) 2001-2003 Joel de Guzman
http://spirit.sourceforge.net/
Use, modification and distribution is subject to 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_EXCEPTIONS_IPP
#define BOOST_SPIRIT_EXCEPTIONS_IPP
namespace boost { namespace spirit { namespace impl {
#ifdef __BORLANDC__
template <typename ParserT, typename ScannerT>
typename parser_result<ParserT, ScannerT>::type
fallback_parser_helper(ParserT const& subject, ScannerT const& scan);
#endif
template <typename RT, typename ParserT, typename ScannerT>
RT fallback_parser_parse(ParserT const& p, ScannerT const& scan)
{
typedef typename ScannerT::iterator_t iterator_t;
typedef typename RT::attr_t attr_t;
typedef error_status<attr_t> error_status_t;
typedef typename ParserT::error_descr_t error_descr_t;
iterator_t save = scan.first;
error_status_t hr(error_status_t::retry);
while (hr.result == error_status_t::retry)
{
try
{
#ifndef __BORLANDC__
return p.subject().parse(scan);
#else
return impl::fallback_parser_helper(p, scan);
#endif
}
catch (parser_error<error_descr_t, iterator_t>& error)
{
scan.first = save;
hr = p.handler(scan, error);
switch (hr.result)
{
case error_status_t::fail:
return scan.no_match();
case error_status_t::accept:
return scan.create_match
(std::size_t(hr.length), hr.value, save, scan.first);
case error_status_t::rethrow:
boost::throw_exception(error);
default:
continue;
}
}
}
return scan.no_match();
}
///////////////////////////////////////////////////////////////////////////
//
// Borland does not like calling the subject directly in the try block.
// Removing the #ifdef __BORLANDC__ code makes Borland complain that
// some variables and types cannot be found in the catch block. Weird!
//
///////////////////////////////////////////////////////////////////////////
#ifdef __BORLANDC__
template <typename ParserT, typename ScannerT>
typename parser_result<ParserT, ScannerT>::type
fallback_parser_helper(ParserT const& p, ScannerT const& scan)
{
return p.subject().parse(scan);
}
#endif
}}} // namespace boost::spirit::impl
///////////////////////////////////////////////////////////////////////////////
#endif