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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 | // A parser for arbitrary tuples. This example presents a parser | |
10 | // for an employee structure. | |
11 | // | |
12 | // [ JDG May 9, 2007 ] | |
13 | // [ JDG May 13, 2015 ] spirit X3 | |
14 | // | |
15 | /////////////////////////////////////////////////////////////////////////////// | |
16 | ||
7c673cae FG |
17 | #include <boost/spirit/home/x3.hpp> |
18 | #include <boost/fusion/include/adapt_struct.hpp> | |
19 | #include <boost/fusion/include/io.hpp> | |
20 | ||
21 | #include <iostream> | |
22 | #include <string> | |
7c673cae FG |
23 | |
24 | namespace client { namespace ast | |
25 | { | |
26 | /////////////////////////////////////////////////////////////////////////// | |
27 | // Our employee struct | |
28 | /////////////////////////////////////////////////////////////////////////// | |
29 | struct employee | |
30 | { | |
31 | int age; | |
7c673cae | 32 | std::string forename; |
92f5a8d4 | 33 | std::string surname; |
7c673cae FG |
34 | double salary; |
35 | }; | |
36 | ||
37 | using boost::fusion::operator<<; | |
38 | }} | |
39 | ||
40 | // We need to tell fusion about our employee struct | |
41 | // to make it a first-class fusion citizen. This has to | |
42 | // be in global scope. | |
43 | ||
44 | BOOST_FUSION_ADAPT_STRUCT(client::ast::employee, | |
92f5a8d4 | 45 | age, forename, surname, salary |
7c673cae FG |
46 | ) |
47 | ||
48 | namespace client | |
49 | { | |
50 | /////////////////////////////////////////////////////////////////////////////// | |
51 | // Our employee parser | |
52 | /////////////////////////////////////////////////////////////////////////////// | |
53 | namespace parser | |
54 | { | |
55 | namespace x3 = boost::spirit::x3; | |
56 | namespace ascii = boost::spirit::x3::ascii; | |
57 | ||
58 | using x3::int_; | |
59 | using x3::lit; | |
60 | using x3::double_; | |
61 | using x3::lexeme; | |
62 | using ascii::char_; | |
63 | ||
64 | x3::rule<class employee, ast::employee> const employee = "employee"; | |
65 | ||
66 | auto const quoted_string = lexeme['"' >> +(char_ - '"') >> '"']; | |
67 | ||
68 | auto const employee_def = | |
69 | lit("employee") | |
70 | >> '{' | |
71 | >> int_ >> ',' | |
72 | >> quoted_string >> ',' | |
73 | >> quoted_string >> ',' | |
74 | >> double_ | |
75 | >> '}' | |
76 | ; | |
77 | ||
78 | BOOST_SPIRIT_DEFINE(employee); | |
79 | } | |
80 | } | |
81 | ||
82 | //////////////////////////////////////////////////////////////////////////// | |
83 | // Main program | |
84 | //////////////////////////////////////////////////////////////////////////// | |
85 | int | |
86 | main() | |
87 | { | |
88 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
89 | std::cout << "\t\tAn employee parser for Spirit...\n\n"; | |
90 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
91 | ||
92 | std::cout | |
93 | << "Give me an employee of the form :" | |
92f5a8d4 | 94 | << "employee{age, \"forename\", \"surname\", salary } \n"; |
7c673cae FG |
95 | std::cout << "Type [q or Q] to quit\n\n"; |
96 | ||
97 | using boost::spirit::x3::ascii::space; | |
98 | typedef std::string::const_iterator iterator_type; | |
99 | using client::parser::employee; | |
100 | ||
101 | std::string str; | |
102 | while (getline(std::cin, str)) | |
103 | { | |
104 | if (str.empty() || str[0] == 'q' || str[0] == 'Q') | |
105 | break; | |
106 | ||
107 | client::ast::employee emp; | |
108 | iterator_type iter = str.begin(); | |
109 | iterator_type const end = str.end(); | |
110 | bool r = phrase_parse(iter, end, employee, space, emp); | |
111 | ||
112 | if (r && iter == end) | |
113 | { | |
114 | std::cout << boost::fusion::tuple_open('['); | |
115 | std::cout << boost::fusion::tuple_close(']'); | |
116 | std::cout << boost::fusion::tuple_delimiter(", "); | |
117 | ||
118 | std::cout << "-------------------------\n"; | |
119 | std::cout << "Parsing succeeded\n"; | |
120 | std::cout << "got: " << emp << std::endl; | |
121 | std::cout << "\n-------------------------\n"; | |
122 | } | |
123 | else | |
124 | { | |
125 | std::cout << "-------------------------\n"; | |
126 | std::cout << "Parsing failed\n"; | |
127 | std::cout << "-------------------------\n"; | |
128 | } | |
129 | } | |
130 | ||
131 | std::cout << "Bye... :-) \n\n"; | |
132 | return 0; | |
133 | } |