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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 | ||
17 | #include <boost/config/warning_disable.hpp> | |
18 | #include <boost/spirit/home/x3.hpp> | |
19 | #include <boost/fusion/include/adapt_struct.hpp> | |
20 | #include <boost/fusion/include/io.hpp> | |
21 | ||
22 | #include <iostream> | |
23 | #include <string> | |
7c673cae FG |
24 | |
25 | namespace client { namespace ast | |
26 | { | |
27 | /////////////////////////////////////////////////////////////////////////// | |
28 | // Our employee struct | |
29 | /////////////////////////////////////////////////////////////////////////// | |
30 | struct employee | |
31 | { | |
32 | int age; | |
7c673cae | 33 | std::string forename; |
92f5a8d4 | 34 | std::string surname; |
7c673cae FG |
35 | double salary; |
36 | }; | |
37 | ||
38 | using boost::fusion::operator<<; | |
39 | }} | |
40 | ||
41 | // We need to tell fusion about our employee struct | |
42 | // to make it a first-class fusion citizen. This has to | |
43 | // be in global scope. | |
44 | ||
45 | BOOST_FUSION_ADAPT_STRUCT(client::ast::employee, | |
92f5a8d4 | 46 | age, forename, surname, salary |
7c673cae FG |
47 | ) |
48 | ||
49 | namespace client | |
50 | { | |
51 | /////////////////////////////////////////////////////////////////////////////// | |
52 | // Our employee parser | |
53 | /////////////////////////////////////////////////////////////////////////////// | |
54 | namespace parser | |
55 | { | |
56 | namespace x3 = boost::spirit::x3; | |
57 | namespace ascii = boost::spirit::x3::ascii; | |
58 | ||
59 | using x3::int_; | |
60 | using x3::lit; | |
61 | using x3::double_; | |
62 | using x3::lexeme; | |
63 | using ascii::char_; | |
64 | ||
65 | x3::rule<class employee, ast::employee> const employee = "employee"; | |
66 | ||
67 | auto const quoted_string = lexeme['"' >> +(char_ - '"') >> '"']; | |
68 | ||
69 | auto const employee_def = | |
70 | lit("employee") | |
71 | >> '{' | |
72 | >> int_ >> ',' | |
73 | >> quoted_string >> ',' | |
74 | >> quoted_string >> ',' | |
75 | >> double_ | |
76 | >> '}' | |
77 | ; | |
78 | ||
79 | BOOST_SPIRIT_DEFINE(employee); | |
80 | } | |
81 | } | |
82 | ||
83 | //////////////////////////////////////////////////////////////////////////// | |
84 | // Main program | |
85 | //////////////////////////////////////////////////////////////////////////// | |
86 | int | |
87 | main() | |
88 | { | |
89 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
90 | std::cout << "\t\tAn employee parser for Spirit...\n\n"; | |
91 | std::cout << "/////////////////////////////////////////////////////////\n\n"; | |
92 | ||
93 | std::cout | |
94 | << "Give me an employee of the form :" | |
92f5a8d4 | 95 | << "employee{age, \"forename\", \"surname\", salary } \n"; |
7c673cae FG |
96 | std::cout << "Type [q or Q] to quit\n\n"; |
97 | ||
98 | using boost::spirit::x3::ascii::space; | |
99 | typedef std::string::const_iterator iterator_type; | |
100 | using client::parser::employee; | |
101 | ||
102 | std::string str; | |
103 | while (getline(std::cin, str)) | |
104 | { | |
105 | if (str.empty() || str[0] == 'q' || str[0] == 'Q') | |
106 | break; | |
107 | ||
108 | client::ast::employee emp; | |
109 | iterator_type iter = str.begin(); | |
110 | iterator_type const end = str.end(); | |
111 | bool r = phrase_parse(iter, end, employee, space, emp); | |
112 | ||
113 | if (r && iter == end) | |
114 | { | |
115 | std::cout << boost::fusion::tuple_open('['); | |
116 | std::cout << boost::fusion::tuple_close(']'); | |
117 | std::cout << boost::fusion::tuple_delimiter(", "); | |
118 | ||
119 | std::cout << "-------------------------\n"; | |
120 | std::cout << "Parsing succeeded\n"; | |
121 | std::cout << "got: " << emp << std::endl; | |
122 | std::cout << "\n-------------------------\n"; | |
123 | } | |
124 | else | |
125 | { | |
126 | std::cout << "-------------------------\n"; | |
127 | std::cout << "Parsing failed\n"; | |
128 | std::cout << "-------------------------\n"; | |
129 | } | |
130 | } | |
131 | ||
132 | std::cout << "Bye... :-) \n\n"; | |
133 | return 0; | |
134 | } |