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1 | /*============================================================================= |
2 | Copyright (c) 2004 Martin Wille | |
3 | http://spirit.sourceforge.net/ | |
4 | ||
5 | Use, modification and distribution is subject to the Boost Software | |
6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
7 | http://www.boost.org/LICENSE_1_0.txt) | |
8 | =============================================================================*/ | |
9 | #include <boost/spirit/include/classic_core.hpp> | |
10 | #include <boost/spirit/include/classic_dynamic.hpp> | |
11 | #include <boost/spirit/include/classic_ast.hpp> | |
1e59de90 TL |
12 | |
13 | #include <boost/core/lightweight_test.hpp> | |
7c673cae | 14 | #include <iostream> |
7c673cae FG |
15 | |
16 | using namespace BOOST_SPIRIT_CLASSIC_NS; | |
17 | int the_var_to_be_tested = 0; | |
18 | ||
19 | namespace local | |
20 | { | |
21 | template <typename T> | |
22 | struct var_wrapper : public ::boost::reference_wrapper<T> | |
23 | { | |
24 | typedef ::boost::reference_wrapper<T> parent; | |
25 | ||
26 | explicit inline var_wrapper(T& t) : parent(t) {} | |
27 | ||
28 | inline T& operator()() const { return parent::get(); } | |
29 | }; | |
30 | ||
31 | template <typename T> | |
32 | inline var_wrapper<T> | |
33 | var(T& t) | |
34 | { | |
35 | return var_wrapper<T>(t); | |
36 | } | |
37 | } | |
38 | ||
39 | struct test_grammar : public grammar <test_grammar> | |
40 | { | |
41 | template <typename ScannerT> | |
42 | ||
43 | struct definition | |
44 | { | |
45 | rule <ScannerT, parser_tag <0> > test; | |
46 | ||
11fdf7f2 | 47 | definition(const test_grammar& /*self*/) |
7c673cae FG |
48 | { |
49 | test | |
50 | = if_p(local::var(the_var_to_be_tested)) | |
51 | [ | |
52 | real_p | |
53 | ]; | |
54 | ||
55 | } | |
56 | const rule <ScannerT, parser_tag<0> >& start() const {return test;} | |
57 | }; | |
58 | }; | |
59 | ||
60 | int main() | |
61 | { | |
62 | test_grammar gram; | |
63 | tree_parse_info <const char*> result; | |
64 | ||
65 | //predictably fails | |
66 | the_var_to_be_tested = 0; | |
67 | result = ast_parse("1.50", gram, space_p); | |
68 | std::cout << "Testing if_p against: " << the_var_to_be_tested << std::endl; | |
69 | std::cout << "success: " << result.full << std::endl; | |
70 | BOOST_TEST(!result.full); | |
71 | ||
72 | //predicatably succeeds | |
73 | the_var_to_be_tested = 1; | |
74 | result = ast_parse("1.50", gram, space_p); | |
75 | std::cout << "Testing if_p against: " << the_var_to_be_tested << std::endl; | |
76 | std::cout << "success: " << result.full << std::endl; | |
77 | BOOST_TEST(result.full); | |
78 | ||
79 | //should succeed | |
80 | the_var_to_be_tested = 2; | |
81 | result = ast_parse("1.50", gram, space_p); | |
82 | std::cout << "Testing if_p against: " << the_var_to_be_tested << std::endl; | |
83 | std::cout << "success: " << result.full << std::endl; | |
84 | BOOST_TEST(result.full); | |
85 | ||
86 | return boost::report_errors(); | |
87 | } | |
88 |