utility/impl/regex.ipp

0001 /*=============================================================================
0002     Copyright (c) 2002-2003 Hartmut Kaiser
0003     http://spirit.sourceforge.net/
0004
0005     Use, modification and distribution is subject to the Boost Software
0006     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0007     http://www.boost.org/LICENSE_1_0.txt)
0008 =============================================================================*/
0009 #ifndef BOOST_SPIRIT_REGEX_IPP
0010 #define BOOST_SPIRIT_REGEX_IPP
0011
0012 ///////////////////////////////////////////////////////////////////////////////
0013 #include <boost/spirit/home/classic/core/primitives/impl/primitives.ipp>
0014
0015 ///////////////////////////////////////////////////////////////////////////////
0016 namespace boost { namespace spirit {
0017
0018 BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
0019
0020 namespace impl {
0021
0022 ///////////////////////////////////////////////////////////////////////////////
0023 //
0024 inline const char* rx_prefix(char) { return "\\A"; }
0025 inline const wchar_t* rx_prefix(wchar_t) { return L"\\A"; }
0026
0027 ///////////////////////////////////////////////////////////////////////////////
0028 //
0029 //  rx_parser class
0030 //
0031 ///////////////////////////////////////////////////////////////////////////////
0032 template <typename CharT = char>
0033 class rx_parser : public parser<rx_parser<CharT> > {
0034
0035 public:
0036     typedef std::basic_string<CharT> string_t;
0037     typedef rx_parser<CharT> self_t;
0038
0039     rx_parser(CharT const *first, CharT const *last)
0040     {
0041         rxstr = string_t(rx_prefix(CharT())) + string_t(first, last);
0042     }
0043
0044     rx_parser(CharT const *first)
0045     {
0046         rxstr = string_t(rx_prefix(CharT())) +
0047             string_t(first, impl::get_last(first));
0048     }
0049
0050     template <typename ScannerT>
0051     typename parser_result<self_t, ScannerT>::type
0052     parse(ScannerT const& scan) const
0053     {
0054         boost::match_results<typename ScannerT::iterator_t> what;
0055         boost::regex_search(scan.first, scan.last, what, rxstr,
0056             boost::match_default);
0057
0058         if (!what[0].matched)
0059             return scan.no_match();
0060
0061         scan.first = what[0].second;
0062         return scan.create_match(what[0].length(), nil_t(),
0063             what[0].first, scan.first);
0064     }
0065
0066 private:
0067 #if BOOST_VERSION >= 013300
0068     boost::basic_regex<CharT> rxstr;       // regular expression to match
0069 #else
0070     boost::reg_expression<CharT> rxstr;    // regular expression to match
0071 #endif
0072 };
0073
0074 }   // namespace impl
0075
0076 ///////////////////////////////////////////////////////////////////////////////
0077 BOOST_SPIRIT_CLASSIC_NAMESPACE_END
0078
0079 }} // namespace boost::spirit
0080
0081 #endif // BOOST_SPIRIT_REGEX_IPP