ceph/src/boost/libs/spirit/example/support/utree/parse_sexpr.cpp

   1 /*==============================================================================
   2     Copyright (c) 2001-2011 Hartmut Kaiser
   3     Copyright (c) 2001-2011 Joel de Guzman
   4     Copyright (c) 2010-2011 Bryce Lelbach
   5
   6     Distributed under the Boost Software License, Version 1.0. (See accompanying
   7     file BOOST_LICENSE_1_0.rst or copy at http://www.boost.org/LICENSE_1_0.txt)
   8 ==============================================================================*/
   9
  10 #include <boost/spirit/include/support_istream_iterator.hpp>
  11 #include <boost/spirit/include/support_line_pos_iterator.hpp>
  12 #include <boost/spirit/include/qi_parse.hpp>
  13
  14 #include "sexpr_parser.hpp"
  15
  16 int
  17 main()
  18 {
  19     using boost::spirit::qi::phrase_parse;
  20
  21     std::cout << "/////////////////////////////////////////////////////////\n\n";
  22     std::cout << "sexpr parser...\n\n";
  23     std::cout << "/////////////////////////////////////////////////////////\n\n";
  24     std::cout << "Type an expression... or [q or Q] to quit\n\n";
  25
  26     typedef std::string::const_iterator iterator_type;
  27     typedef sexpr::parser<iterator_type> parser;
  28     typedef sexpr::whitespace<iterator_type> space;
  29
  30     parser p;
  31     space ws;
  32
  33     std::string str;
  34     while (std::getline(std::cin, str))
  35     {
  36         if (str.empty() || str[0] == 'q' || str[0] == 'Q')
  37             break;
  38
  39         std::string::const_iterator iter = str.begin();
  40         std::string::const_iterator end = str.end();
  41         bool r = phrase_parse(iter, end, p, ws);
  42
  43         if (r && iter == end)
  44         {
  45             std::cout << "-------------------------\n";
  46             std::cout << "Parsing succeeded\n";
  47             std::cout << "-------------------------\n";
  48         }
  49         else
  50         {
  51             std::string rest(iter, end);
  52             std::cout << "-------------------------\n";
  53             std::cout << "Parsing failed\n";
  54             std::cout << "stopped at: \": " << rest << "\"\n";
  55             std::cout << "-------------------------\n";
  56         }
  57     }
  58
  59     std::cout << "Bye... :-) \n\n";
  60     return 0;
  61 }
  62