1/*=============================================================================
2 Copyright (c) 2002-2010 Hartmut Kaiser
3 Copyright (c) 2002-2010 Joel de Guzman
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7=============================================================================*/
8///////////////////////////////////////////////////////////////////////////////
9//
10// This sample demonstrates a generator for a comma separated list of numbers.
11// No actions. It is based on the example qi/num_lists.cpp for reading in
12// some numbers to generate.
13//
14///////////////////////////////////////////////////////////////////////////////
15
16#include <boost/spirit/include/qi.hpp>
17#include <boost/spirit/include/karma.hpp>
18
19#include <iostream>
20#include <string>
21#include <vector>
22
23namespace client
24{
25 ///////////////////////////////////////////////////////////////////////////
26 // Our number list parser, please see the example qi/numlist1.cpp for
27 // more information
28 ///////////////////////////////////////////////////////////////////////////
29 template <typename Iterator>
30 bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
31 {
32 using boost::spirit::qi::double_;
33 using boost::spirit::qi::phrase_parse;
34 using boost::spirit::ascii::space;
35
36 bool r = phrase_parse(first, last, double_ % ',', space, v);
37 if (first != last)
38 return false;
39 return r;
40 }
41
42 ///////////////////////////////////////////////////////////////////////////
43 // Our number list generator
44 ///////////////////////////////////////////////////////////////////////////
45 //[tutorial_karma_numlist2
46 template <typename OutputIterator, typename Container>
47 bool generate_numbers(OutputIterator& sink, Container const& v)
48 {
49 using boost::spirit::karma::double_;
50 using boost::spirit::karma::generate_delimited;
51 using boost::spirit::ascii::space;
52
53 bool r = generate_delimited(
54 sink, // destination: output iterator
55 double_ % ',', // the generator
56 space, // the delimiter-generator
57 v // the data to output
58 );
59 return r;
60 }
61 //]
62}
63
64////////////////////////////////////////////////////////////////////////////
65// Main program
66////////////////////////////////////////////////////////////////////////////
67int
68main()
69{
70 std::cout << "/////////////////////////////////////////////////////////\n\n";
71 std::cout << "\t\tA comma separated list generator 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 << "Type [q or Q] to quit\n\n";
76
77 std::string str;
78 while (getline(is&: std::cin, str&: str))
79 {
80 if (str.empty() || str[0] == 'q' || str[0] == 'Q')
81 break;
82
83 std::vector<double> v; // here we put the data to generate
84 if (client::parse_numbers(first: str.begin(), last: str.end(), v))
85 {
86 // ok, we got some numbers, now print them back out
87 std::cout << "-------------------------\n";
88
89 std::string generated;
90 std::back_insert_iterator<std::string> sink(generated);
91 if (!client::generate_numbers(sink, v))
92 {
93 std::cout << "-------------------------\n";
94 std::cout << "Generating failed\n";
95 std::cout << "-------------------------\n";
96 }
97 else
98 {
99 std::cout << "-------------------------\n";
100 std::cout << "Generated: " << generated << "\n";
101 std::cout << "-------------------------\n";
102 }
103 }
104 else
105 {
106 std::cout << "-------------------------\n";
107 std::cout << "Parsing failed\n";
108 std::cout << "-------------------------\n";
109 }
110 }
111
112 std::cout << "Bye... :-) \n\n";
113 return 0;
114}
115
116
117

source code of boost/libs/spirit/example/karma/num_list2.cpp