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