ceph/src/boost/libs/spirit/example/qi/num_list1.cpp

   1 /*=============================================================================
   2     Copyright (c) 2002-2010 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7 ///////////////////////////////////////////////////////////////////////////////
   8 //
   9 //  This sample demontrates a parser for a comma separated list of numbers.
  10 //  No actions.
  11 //
  12 //  [ JDG May 10, 2002 ]    spirit1
  13 //  [ JDG March 24, 2007 ]  spirit2
  14 //
  15 ///////////////////////////////////////////////////////////////////////////////
  16
  17 #include <boost/config/warning_disable.hpp>
  18 #include <boost/spirit/include/qi.hpp>
  19
  20 #include <iostream>
  21 #include <string>
  22 #include <vector>
  23
  24 namespace client
  25 {
  26     namespace qi = boost::spirit::qi;
  27     namespace ascii = boost::spirit::ascii;
  28
  29     ///////////////////////////////////////////////////////////////////////////
  30     //  Our number list parser
  31     ///////////////////////////////////////////////////////////////////////////
  32     //[tutorial_numlist1
  33     template <typename Iterator>
  34     bool parse_numbers(Iterator first, Iterator last)
  35     {
  36         using qi::double_;
  37         using qi::phrase_parse;
  38         using ascii::space;
  39
  40         bool r = phrase_parse(
  41             first,                          /*< start iterator >*/
  42             last,                           /*< end iterator >*/
  43             double_ >> *(',' >> double_),   /*< the parser >*/
  44             space                           /*< the skip-parser >*/
  45         );
  46         if (first != last) // fail if we did not get a full match
  47             return false;
  48         return r;
  49     }
  50     //]
  51 }
  52
  53 ////////////////////////////////////////////////////////////////////////////
  54 //  Main program
  55 ////////////////////////////////////////////////////////////////////////////
  56 int
  57 main()
  58 {
  59     std::cout << "/////////////////////////////////////////////////////////\n\n";
  60     std::cout << "\t\tA comma separated list parser for Spirit...\n\n";
  61     std::cout << "/////////////////////////////////////////////////////////\n\n";
  62
  63     std::cout << "Give me a comma separated list of numbers.\n";
  64     std::cout << "Type [q or Q] to quit\n\n";
  65
  66     std::string str;
  67     while (getline(std::cin, str))
  68     {
  69         if (str.empty() || str[0] == 'q' || str[0] == 'Q')
  70             break;
  71
  72         if (client::parse_numbers(str.begin(), str.end()))
  73         {
  74             std::cout << "-------------------------\n";
  75             std::cout << "Parsing succeeded\n";
  76             std::cout << str << " Parses OK: " << std::endl;
  77         }
  78         else
  79         {
  80             std::cout << "-------------------------\n";
  81             std::cout << "Parsing failed\n";
  82             std::cout << "-------------------------\n";
  83         }
  84     }
  85
  86     std::cout << "Bye... :-) \n\n";
  87     return 0;
  88 }
  89
  90