1 /*=============================================================================
2 Copyright (c) 2002-2015 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 // This time, the numbers are automatically collected into the attribute by
11 // the parser itself using the full power of attribute grammars.
12 //
13 // [ JDG May 10, 2002 ] spirit1
14 // [ JDG March 24, 2007 ] spirit2
15 // [ JDG May 12, 2015 ] spirit X3
16 //
17 ///////////////////////////////////////////////////////////////////////////////
18
19 #include <boost/config/warning_disable.hpp>
20 #include <boost/spirit/home/x3.hpp>
21
22 #include <iostream>
23 #include <string>
24 #include <vector>
25
26 namespace client
27 {
28 namespace x3 = boost::spirit::x3;
29 namespace ascii = boost::spirit::x3::ascii;
30
31 ///////////////////////////////////////////////////////////////////////////
32 // Our number list compiler
33 ///////////////////////////////////////////////////////////////////////////
34 //[tutorial_numlist4
35 template <typename Iterator>
parse_numbers(Iterator first,Iterator last,std::vector<double> & v)36 bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
37 {
38 using x3::double_;
39 using x3::phrase_parse;
40 using x3::_attr;
41 using ascii::space;
42
43 bool r = phrase_parse(first, last,
44
45 // Begin grammar
46 (
47 double_ % ','
48 )
49 ,
50 // End grammar
51
52 space, v);
53
54 if (first != last) // fail if we did not get a full match
55 return false;
56 return r;
57 }
58 //]
59 }
60
61 ////////////////////////////////////////////////////////////////////////////
62 // Main program
63 ////////////////////////////////////////////////////////////////////////////
64 int
main()65 main()
66 {
67 std::cout << "/////////////////////////////////////////////////////////\n\n";
68 std::cout << "\t\tA comma separated list parser for Spirit...\n\n";
69 std::cout << "/////////////////////////////////////////////////////////\n\n";
70
71 std::cout << "Give me a comma separated list of numbers.\n";
72 std::cout << "The numbers will be inserted in a vector of numbers\n";
73 std::cout << "Type [q or Q] to quit\n\n";
74
75 std::string str;
76 while (getline(std::cin, str))
77 {
78 if (str.empty() || str[0] == 'q' || str[0] == 'Q')
79 break;
80
81 std::vector<double> v;
82 if (client::parse_numbers(str.begin(), str.end(), v))
83 {
84 std::cout << "-------------------------\n";
85 std::cout << "Parsing succeeded\n";
86 std::cout << str << " Parses OK: " << std::endl;
87
88 for (std::vector<double>::size_type i = 0; i < v.size(); ++i)
89 std::cout << i << ": " << v[i] << std::endl;
90
91 std::cout << "\n-------------------------\n";
92 }
93 else
94 {
95 std::cout << "-------------------------\n";
96 std::cout << "Parsing failed\n";
97 std::cout << "-------------------------\n";
98 }
99 }
100
101 std::cout << "Bye... :-) \n\n";
102 return 0;
103 }
104