| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2001-2003 Joel de Guzman |
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| 3 | http://spirit.sourceforge.net/ |
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| 4 | |
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| 5 | Use, modification and distribution is subject to the Boost Software |
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| 6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 7 | http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | =============================================================================*/ |
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| 9 | #ifndef BOOST_SPIRIT_EXCEPTIONS_IPP |
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| 10 | #define BOOST_SPIRIT_EXCEPTIONS_IPP |
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| 11 | |
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| 12 | namespace boost { namespace spirit { |
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| 13 | |
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| 14 | BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN |
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| 15 | |
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| 16 | namespace impl { |
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| 17 | |
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| 18 | #ifdef __BORLANDC__ |
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| 19 | template <typename ParserT, typename ScannerT> |
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| 20 | typename parser_result<ParserT, ScannerT>::type |
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| 21 | fallback_parser_helper(ParserT const& subject, ScannerT const& scan); |
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| 22 | #endif |
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| 23 | |
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| 24 | template <typename RT, typename ParserT, typename ScannerT> |
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| 25 | RT fallback_parser_parse(ParserT const& p, ScannerT const& scan) |
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| 26 | { |
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| 27 | typedef typename ScannerT::iterator_t iterator_t; |
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| 28 | typedef typename RT::attr_t attr_t; |
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| 29 | typedef error_status<attr_t> error_status_t; |
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| 30 | typedef typename ParserT::error_descr_t error_descr_t; |
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| 31 | |
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| 32 | iterator_t save = scan.first; |
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| 33 | error_status_t hr(error_status_t::retry); |
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| 34 | |
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| 35 | while (hr.result == error_status_t::retry) |
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| 36 | { |
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| 37 | try |
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| 38 | { |
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| 39 | #ifndef __BORLANDC__ |
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| 40 | return p.subject().parse(scan); |
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| 41 | #else |
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| 42 | return impl::fallback_parser_helper(p, scan); |
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| 43 | #endif |
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| 44 | } |
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| 45 | |
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| 46 | catch (parser_error<error_descr_t, iterator_t>& error) |
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| 47 | { |
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| 48 | scan.first = save; |
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| 49 | hr = p.handler(scan, error); |
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| 50 | switch (hr.result) |
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| 51 | { |
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| 52 | case error_status_t::fail: |
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| 53 | return scan.no_match(); |
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| 54 | case error_status_t::accept: |
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| 55 | return scan.create_match |
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| 56 | (std::size_t(hr.length), hr.value, save, scan.first); |
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| 57 | case error_status_t::rethrow: |
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| 58 | boost::throw_exception(error); |
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| 59 | default: |
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| 60 | continue; |
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| 61 | } |
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| 62 | } |
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| 63 | } |
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| 64 | return scan.no_match(); |
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| 65 | } |
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| 66 | |
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| 67 | /////////////////////////////////////////////////////////////////////////// |
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| 68 | // |
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| 69 | // Borland does not like calling the subject directly in the try block. |
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| 70 | // Removing the #ifdef __BORLANDC__ code makes Borland complain that |
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| 71 | // some variables and types cannot be found in the catch block. Weird! |
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| 72 | // |
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| 73 | /////////////////////////////////////////////////////////////////////////// |
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| 74 | #ifdef __BORLANDC__ |
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| 75 | |
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| 76 | template <typename ParserT, typename ScannerT> |
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| 77 | typename parser_result<ParserT, ScannerT>::type |
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| 78 | fallback_parser_helper(ParserT const& p, ScannerT const& scan) |
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| 79 | { |
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| 80 | return p.subject().parse(scan); |
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| 81 | } |
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| 82 | |
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| 83 | #endif |
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| 84 | |
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| 85 | } |
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| 86 | |
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| 87 | BOOST_SPIRIT_CLASSIC_NAMESPACE_END |
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| 88 | |
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| 89 | }} // namespace boost::spirit::impl |
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| 90 | |
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| 91 | /////////////////////////////////////////////////////////////////////////////// |
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| 92 | #endif |
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| 93 | |
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| 94 | |
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