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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 | // A parser for arbitrary tuples. This example presents a parser | |
10 | // for an employee structure. | |
11 | // | |
12 | // [ JDG May 9, 2007 ] | |
13 | // | |
14 | /////////////////////////////////////////////////////////////////////////////// | |
15 | ||
16 | #include <boost/config/warning_disable.hpp> | |
17 | #include <boost/spirit/include/qi.hpp> | |
18 | #include <boost/spirit/include/phoenix_core.hpp> | |
19 | #include <boost/spirit/include/phoenix_operator.hpp> | |
20 | #include <boost/spirit/include/phoenix_object.hpp> | |
21 | #include <boost/fusion/include/adapt_struct.hpp> | |
22 | #include <boost/fusion/include/io.hpp> | |
23 | ||
24 | #include <iostream> | |
25 | #include <string> | |
26 | #include <complex> | |
27 | ||
28 | namespace client | |
29 | { | |
30 | namespace qi = boost::spirit::qi; | |
31 | namespace ascii = boost::spirit::ascii; | |
32 | ||
33 | /////////////////////////////////////////////////////////////////////////// | |
34 | // Our employee struct | |
35 | /////////////////////////////////////////////////////////////////////////// | |
36 | //[tutorial_employee_struct | |
37 | struct employee | |
38 | { | |
39 | int age; | |
40 | std::string surname; | |
41 | std::string forename; | |
42 | double salary; | |
43 | }; | |
44 | //] | |
45 | } | |
46 | ||
47 | // We need to tell fusion about our employee struct | |
48 | // to make it a first-class fusion citizen. This has to | |
49 | // be in global scope. | |
50 | ||
51 | //[tutorial_employee_adapt_struct | |
52 | BOOST_FUSION_ADAPT_STRUCT( | |
53 | client::employee, | |
54 | (int, age) | |
55 | (std::string, surname) | |
56 | (std::string, forename) | |
57 | (double, salary) | |
58 | ) | |
59 | //] | |
60 | ||
61 | namespace client | |
62 | { | |
63 | /////////////////////////////////////////////////////////////////////////////// | |
64 | // Our employee parser | |
65 | /////////////////////////////////////////////////////////////////////////////// | |
66 | //[tutorial_employee_parser | |
67 | template <typename Iterator> | |
68 | struct employee_parser : qi::grammar<Iterator, employee(), ascii::space_type> | |
69 | { | |
70 | employee_parser() : employee_parser::base_type(start) | |
71 | { | |
72 | using qi::int_; | |
73 | using qi::lit; | |
74 | using qi::double_; | |
75 | using qi::lexeme; | |
76 | using ascii::char_; | |
77 | ||
78 | quoted_string %= lexeme['"' >> +(char_ - '"') >> '"']; | |
79 | ||
80 | start %= | |
81 | lit("employee") | |
82 | >> '{' | |
83 | >> int_ >> ',' | |
84 | >> quoted_string >> ',' | |
85 | >> quoted_string >> ',' | |
86 | >> double_ | |
87 | >> '}' | |
88 | ; | |
89 | } | |
90 | ||
91 | qi::rule<Iterator, std::string(), ascii::space_type> quoted_string; | |
92 | qi::rule<Iterator, employee(), ascii::space_type> start; | |
93 | }; | |
94 | //] | |
95 | } | |
96 | ||
97 | //////////////////////////////////////////////////////////////////////////// | |
98 | // Main program | |
99 | //////////////////////////////////////////////////////////////////////////// | |
100 | int | |
101 | main() | |
102 | { | |
103 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
104 | std::cout << "\t\tAn employee parser for Spirit...\n\n"; | |
105 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
106 | ||
107 | std::cout | |
108 | << "Give me an employee of the form :" | |
109 | << "employee{age, \"surname\", \"forename\", salary } \n"; | |
110 | std::cout << "Type [q or Q] to quit\n\n"; | |
111 | ||
112 | using boost::spirit::ascii::space; | |
113 | typedef std::string::const_iterator iterator_type; | |
114 | typedef client::employee_parser<iterator_type> employee_parser; | |
115 | ||
116 | employee_parser g; // Our grammar | |
117 | std::string str; | |
118 | while (getline(std::cin, str)) | |
119 | { | |
120 | if (str.empty() || str[0] == 'q' || str[0] == 'Q') | |
121 | break; | |
122 | ||
123 | client::employee emp; | |
124 | std::string::const_iterator iter = str.begin(); | |
125 | std::string::const_iterator end = str.end(); | |
126 | bool r = phrase_parse(iter, end, g, space, emp); | |
127 | ||
128 | if (r && iter == end) | |
129 | { | |
130 | std::cout << boost::fusion::tuple_open('['); | |
131 | std::cout << boost::fusion::tuple_close(']'); | |
132 | std::cout << boost::fusion::tuple_delimiter(", "); | |
133 | ||
134 | std::cout << "-------------------------\n"; | |
135 | std::cout << "Parsing succeeded\n"; | |
136 | std::cout << "got: " << boost::fusion::as_vector(emp) << std::endl; | |
137 | std::cout << "\n-------------------------\n"; | |
138 | } | |
139 | else | |
140 | { | |
141 | std::cout << "-------------------------\n"; | |
142 | std::cout << "Parsing failed\n"; | |
143 | std::cout << "-------------------------\n"; | |
144 | } | |
145 | } | |
146 | ||
147 | std::cout << "Bye... :-) \n\n"; | |
148 | return 0; | |
149 | } | |
150 | ||
151 |