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 namespace phoenix = boost::phoenix;
32
33 ///////////////////////////////////////////////////////////////////////////////
34 // Our number list compiler
35 ///////////////////////////////////////////////////////////////////////////////
36 //[tutorial_numlist3
37 template <typename Iterator>
parse_numbers(Iterator first,Iterator last,std::vector<double> & v)38 bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
39 {
40 using qi::double_;
41 using qi::phrase_parse;
42 using qi::_1;
43 using ascii::space;
44 using phoenix::push_back;
45
46 bool r = phrase_parse(first, last,
47
48 // Begin grammar
49 (
50 double_[push_back(phoenix::ref(v), _1)] % ','
51 )
52 ,
53 // End grammar
54
55 space);
56
57 if (first != last) // fail if we did not get a full match
58 return false;
59 return r;
60 }
61 //]
62 }
63
64 ////////////////////////////////////////////////////////////////////////////
65 // Main program
66 ////////////////////////////////////////////////////////////////////////////
67 int
main()68 main()
69 {
70 std::cout << "/////////////////////////////////////////////////////////\n\n";
71 std::cout << "\t\tA comma separated list parser for Spirit...\n\n";
72 std::cout << "/////////////////////////////////////////////////////////\n\n";
73
74 std::cout << "Give me a comma separated list of numbers.\n";
75 std::cout << "The numbers will be inserted in a vector of numbers\n";
76 std::cout << "Type [q or Q] to quit\n\n";
77
78 std::string str;
79 while (getline(std::cin, str))
80 {
81 if (str.empty() || str[0] == 'q' || str[0] == 'Q')
82 break;
83
84 std::vector<double> v;
85 if (client::parse_numbers(str.begin(), str.end(), v))
86 {
87 std::cout << "-------------------------\n";
88 std::cout << "Parsing succeeded\n";
89 std::cout << str << " Parses OK: " << std::endl;
90
91 for (std::vector<double>::size_type i = 0; i < v.size(); ++i)
92 std::cout << i << ": " << v[i] << std::endl;
93
94 std::cout << "\n-------------------------\n";
95 }
96 else
97 {
98 std::cout << "-------------------------\n";
99 std::cout << "Parsing failed\n";
100 std::cout << "-------------------------\n";
101 }
102 }
103
104 std::cout << "Bye... :-) \n\n";
105 return 0;
106 }
107
108
109