ceph/src/boost/boost/spirit/home/classic/error_handling/impl/exceptions.ipp

   1 /*=============================================================================
   2     Copyright (c) 2001-2003 Joel de Guzman
   3     http://spirit.sourceforge.net/
   4
   5     Use, modification and distribution is subject to the Boost Software
   6     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7     http://www.boost.org/LICENSE_1_0.txt)
   8 =============================================================================*/
   9 #ifndef BOOST_SPIRIT_EXCEPTIONS_IPP
  10 #define BOOST_SPIRIT_EXCEPTIONS_IPP
  11
  12 namespace boost { namespace spirit {
  13
  14 BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
  15
  16 namespace impl {
  17
  18 #ifdef __BORLANDC__
  19     template <typename ParserT, typename ScannerT>
  20     typename parser_result<ParserT, ScannerT>::type
  21     fallback_parser_helper(ParserT const& subject, ScannerT const& scan);
  22 #endif
  23
  24     template <typename RT, typename ParserT, typename ScannerT>
  25     RT fallback_parser_parse(ParserT const& p, ScannerT const& scan)
  26     {
  27         typedef typename ScannerT::iterator_t iterator_t;
  28         typedef typename RT::attr_t attr_t;
  29         typedef error_status<attr_t> error_status_t;
  30         typedef typename ParserT::error_descr_t error_descr_t;
  31
  32         iterator_t save = scan.first;
  33         error_status_t hr(error_status_t::retry);
  34
  35         while (hr.result == error_status_t::retry)
  36         {
  37             try
  38             {
  39             #ifndef __BORLANDC__
  40                 return p.subject().parse(scan);
  41             #else
  42                 return impl::fallback_parser_helper(p, scan);
  43             #endif
  44             }
  45
  46             catch (parser_error<error_descr_t, iterator_t>& error)
  47             {
  48                 scan.first = save;
  49                 hr = p.handler(scan, error);
  50                 switch (hr.result)
  51                 {
  52                     case error_status_t::fail:
  53                         return scan.no_match();
  54                     case error_status_t::accept:
  55                         return scan.create_match
  56                             (std::size_t(hr.length), hr.value, save, scan.first);
  57                     case error_status_t::rethrow:
  58                          boost::throw_exception(error);
  59                     default:
  60                         continue;
  61                 }
  62             }
  63         }
  64         return scan.no_match();
  65     }
  66
  67 ///////////////////////////////////////////////////////////////////////////
  68 //
  69 //  Borland does not like calling the subject directly in the try block.
  70 //  Removing the #ifdef __BORLANDC__ code makes Borland complain that
  71 //  some variables and types cannot be found in the catch block. Weird!
  72 //
  73 ///////////////////////////////////////////////////////////////////////////
  74 #ifdef __BORLANDC__
  75
  76     template <typename ParserT, typename ScannerT>
  77     typename parser_result<ParserT, ScannerT>::type
  78     fallback_parser_helper(ParserT const& p, ScannerT const& scan)
  79     {
  80         return p.subject().parse(scan);
  81     }
  82
  83 #endif
  84
  85 }
  86
  87 BOOST_SPIRIT_CLASSIC_NAMESPACE_END
  88
  89 }} // namespace boost::spirit::impl
  90
  91 ///////////////////////////////////////////////////////////////////////////////
  92 #endif
  93