ceph/src/boost/libs/spirit/example/qi/num_list4.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 //  The numbers are inserted in a vector using phoenix.
  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 #include <boost/spirit/include/phoenix_core.hpp>
  20 #include <boost/spirit/include/phoenix_operator.hpp>
  21 #include <boost/spirit/include/phoenix_stl.hpp>
  22
  23 #include <iostream>
  24 #include <string>
  25 #include <vector>
  26
  27 namespace client
  28 {
  29     namespace qi = boost::spirit::qi;
  30     namespace ascii = boost::spirit::ascii;
  31
  32     ///////////////////////////////////////////////////////////////////////////
  33     //  Our number list compiler
  34     ///////////////////////////////////////////////////////////////////////////
  35     //[tutorial_numlist4
  36     template <typename Iterator>
  37     bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
  38     {
  39         using qi::double_;
  40         using qi::phrase_parse;
  41         using qi::_1;
  42         using ascii::space;
  43
  44         bool r = phrase_parse(first, last,
  45
  46             //  Begin grammar
  47             (
  48                 double_ % ','
  49             )
  50             ,
  51             //  End grammar
  52
  53             space, v);
  54
  55         if (first != last) // fail if we did not get a full match
  56             return false;
  57         return r;
  58     }
  59     //]
  60 }
  61
  62 ////////////////////////////////////////////////////////////////////////////
  63 //  Main program
  64 ////////////////////////////////////////////////////////////////////////////
  65 int
  66 main()
  67 {
  68     std::cout << "/////////////////////////////////////////////////////////\n\n";
  69     std::cout << "\t\tA comma separated list parser for Spirit...\n\n";
  70     std::cout << "/////////////////////////////////////////////////////////\n\n";
  71
  72     std::cout << "Give me a comma separated list of numbers.\n";
  73     std::cout << "The numbers will be inserted in a vector of numbers\n";
  74     std::cout << "Type [q or Q] to quit\n\n";
  75
  76     std::string str;
  77     while (getline(std::cin, str))
  78     {
  79         if (str.empty() || str[0] == 'q' || str[0] == 'Q')
  80             break;
  81
  82         std::vector<double> v;
  83         if (client::parse_numbers(str.begin(), str.end(), v))
  84         {
  85             std::cout << "-------------------------\n";
  86             std::cout << "Parsing succeeded\n";
  87             std::cout << str << " Parses OK: " << std::endl;
  88
  89             for (std::vector<double>::size_type i = 0; i < v.size(); ++i)
  90                 std::cout << i << ": " << v[i] << std::endl;
  91
  92             std::cout << "\n-------------------------\n";
  93         }
  94         else
  95         {
  96             std::cout << "-------------------------\n";
  97             std::cout << "Parsing failed\n";
  98             std::cout << "-------------------------\n";
  99         }
 100     }
 101
 102     std::cout << "Bye... :-) \n\n";
 103     return 0;
 104 }
 105
 106