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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 | ||
7c673cae FG |
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 | ||
23 | namespace 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 | //[tutorial_karma_numlist3_complex | |
43 | // a simple complex number representation z = a + bi | |
44 | struct complex | |
45 | { | |
46 | complex (double a, double b = 0.0) : a(a), b(b) {} | |
47 | ||
48 | double a; | |
49 | double b; | |
50 | }; | |
51 | ||
52 | // the streaming operator for the type complex | |
53 | std::ostream& | |
54 | operator<< (std::ostream& os, complex const& z) | |
55 | { | |
56 | os << "{" << z.a << "," << z.b << "}"; | |
57 | return os; | |
58 | } | |
59 | //] | |
60 | ||
61 | /////////////////////////////////////////////////////////////////////////// | |
62 | // Our number list generator | |
63 | /////////////////////////////////////////////////////////////////////////// | |
64 | //[tutorial_karma_numlist3 | |
65 | template <typename OutputIterator, typename Container> | |
66 | bool generate_numbers(OutputIterator& sink, Container const& v) | |
67 | { | |
68 | using boost::spirit::karma::stream; | |
69 | using boost::spirit::karma::generate; | |
70 | using boost::spirit::karma::eol; | |
71 | ||
72 | bool r = generate( | |
73 | sink, // destination: output iterator | |
74 | stream % eol, // the generator | |
75 | v // the data to output | |
76 | ); | |
77 | return r; | |
78 | } | |
79 | //] | |
80 | } | |
81 | ||
82 | //////////////////////////////////////////////////////////////////////////// | |
83 | // Main program | |
84 | //////////////////////////////////////////////////////////////////////////// | |
85 | int | |
86 | main() | |
87 | { | |
88 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
89 | std::cout << "\tA comma separated list generator for Spirit...\n\n"; | |
90 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
91 | ||
92 | std::cout << "Give me a comma separated list of numbers.\n"; | |
93 | std::cout << "Type [q or Q] to quit\n\n"; | |
94 | ||
95 | std::string str; | |
96 | while (getline(std::cin, str)) | |
97 | { | |
98 | if (str.empty() || str[0] == 'q' || str[0] == 'Q') | |
99 | break; | |
100 | ||
101 | std::vector<double> v; // here we put the data gotten from input | |
102 | if (client::parse_numbers(str.begin(), str.end(), v)) | |
103 | { | |
104 | // ok, we got some numbers, fill a vector of client::complex | |
105 | // instances and print them back out | |
106 | std::vector<client::complex> vc; | |
107 | std::vector<double>::const_iterator end = v.end(); | |
108 | for (std::vector<double>::const_iterator it = v.begin(); | |
109 | it != end; ++it) | |
110 | { | |
111 | double real(*it); | |
112 | if (++it != end) | |
113 | vc.push_back(client::complex(real, *it)); | |
114 | else { | |
115 | vc.push_back(client::complex(real)); | |
116 | break; | |
117 | } | |
118 | } | |
119 | ||
120 | std::cout << "-------------------------\n"; | |
121 | ||
122 | std::string generated; | |
123 | std::back_insert_iterator<std::string> sink(generated); | |
124 | if (!client::generate_numbers(sink, vc)) | |
125 | { | |
126 | std::cout << "-------------------------\n"; | |
127 | std::cout << "Generating failed\n"; | |
128 | std::cout << "-------------------------\n"; | |
129 | } | |
130 | else | |
131 | { | |
132 | std::cout << "-------------------------\n"; | |
133 | std::cout << "Generated:\n" << generated << "\n"; | |
134 | std::cout << "-------------------------\n"; | |
135 | } | |
136 | } | |
137 | else | |
138 | { | |
139 | std::cout << "-------------------------\n"; | |
140 | std::cout << "Parsing failed\n"; | |
141 | std::cout << "-------------------------\n"; | |
142 | } | |
143 | } | |
144 | ||
145 | std::cout << "Bye... :-) \n\n"; | |
146 | return 0; | |
147 | } | |
148 | ||
149 |