ceph/src/boost/libs/spirit/classic/test/mix_and_match_trees.cpp

   1 //
   2 //  Copyright (c) 2006 Joao Abecasis
   3 //
   4 //  Distributed under the Boost Software License, Version 1.0. (See
   5 //  accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8
   9 ////////////////////////////////////////////////////////////////////////////////
  10 //
  11 //  As reported by Jascha Wetzel, in
  12 //  http://article.gmane.org/gmane.comp.parsers.spirit.general/9013, the
  13 //  directives gen_ast_node_d and gen_pt_node_d were not working for lack of
  14 //  appropriate conversion constructors in the underlying tree match policies.
  15 //
  16 ////////////////////////////////////////////////////////////////////////////////
  17
  18 #include <boost/spirit/include/classic_core.hpp>
  19 #include <boost/spirit/include/classic_ast.hpp>
  20 #include <boost/spirit/include/classic_parse_tree.hpp>
  21
  22 using namespace BOOST_SPIRIT_CLASSIC_NS;
  23
  24 struct my_grammar : grammar<my_grammar>
  25 {
  26     template <class Scanner>
  27     struct definition
  28     {
  29         typedef
  30             scanner<
  31                 typename Scanner::iterator_t,
  32                 scanner_policies<
  33                     typename Scanner::iteration_policy_t,
  34                     ast_match_policy<
  35                         typename Scanner::match_policy_t::iterator_t,
  36                         typename Scanner::match_policy_t::factory_t
  37                     >,
  38                     typename Scanner::action_policy_t
  39                 >
  40             > ast_scanner;
  41
  42         typedef
  43             scanner<
  44                 typename Scanner::iterator_t,
  45                 scanner_policies<
  46                     typename Scanner::iteration_policy_t,
  47                     pt_match_policy<
  48                         typename Scanner::match_policy_t::iterator_t,
  49                         typename Scanner::match_policy_t::factory_t
  50                     >,
  51                     typename Scanner::action_policy_t
  52                 >
  53             > pt_scanner;
  54
  55         typedef rule<ast_scanner> ast_rule;
  56         typedef rule<pt_scanner> pt_rule;
  57         typedef rule<Scanner> rule_;
  58
  59         definition(my_grammar const & /* self */)
  60         {
  61             start_ = gen_ast_node_d[ ast_rule_ ];
  62             start_ = gen_pt_node_d[ pt_rule_ ];
  63         }
  64
  65         rule_ const & start() const
  66         {
  67             return start_;
  68         }
  69
  70         rule_ start_;
  71         ast_rule ast_rule_;
  72         pt_rule pt_rule_;
  73     };
  74 };
  75
  76 int main()
  77 {
  78     const char * begin = NULL, * end = NULL;
  79
  80     pt_parse(begin, end, my_grammar());
  81     ast_parse(begin, end, my_grammar());
  82 }