ceph/src/boost/libs/spirit/classic/example/techniques/no_rules/no_rule2.cpp

   1 /*=============================================================================
   2     Copyright (c) 2002-2003 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
  10 // *** See the section "Look Ma' No Rules" in
  11 // *** chapter "Techniques" of the Spirit documentation
  12 // *** for information regarding this snippet
  13
  14 #include <iostream>
  15 #include <boost/spirit/include/classic_core.hpp>
  16 #include <boost/assert.hpp>
  17
  18 using namespace BOOST_SPIRIT_CLASSIC_NS;
  19
  20 struct skip_grammar : grammar<skip_grammar>
  21 {
  22     template <typename ScannerT>
  23     struct definition
  24     {
  25         definition(skip_grammar const& /*self*/)
  26         : skip
  27             (       space_p
  28                 |   "//" >> *(anychar_p - '\n') >> '\n'
  29                 |   "/*" >> *(anychar_p - "*/") >> "*/"
  30             )
  31         {
  32         }
  33
  34         typedef
  35            alternative<alternative<space_parser, sequence<sequence<
  36            strlit<const char*>, kleene_star<difference<anychar_parser,
  37            chlit<char> > > >, chlit<char> > >, sequence<sequence<
  38            strlit<const char*>, kleene_star<difference<anychar_parser,
  39            strlit<const char*> > > >, strlit<const char*> > >
  40         skip_t;
  41         skip_t skip;
  42
  43         skip_t const&
  44         start() const { return skip; }
  45     };
  46 };
  47
  48 int
  49 main()
  50 {
  51     skip_grammar g;
  52     bool success = parse(
  53         "/*this is a comment*/\n//this is a c++ comment\n\n",
  54         *g).full;
  55     BOOST_ASSERT(success);
  56     std::cout << "SUCCESS!!!\n";
  57     return 0;
  58 }