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>
parse_numbers(Iterator first,Iterator last)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
main()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
91