| 1 | // |
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| 2 | // Copyright (c) 2006 João Abecasis |
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| 3 | // |
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 5 | // accompanying file LICENSE_1_0.txt or copy at |
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| 6 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | // |
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| 8 | |
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| 9 | //////////////////////////////////////////////////////////////////////////////// |
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| 10 | // |
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| 11 | // As reported by Jascha Wetzel, in |
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| 12 | // http://article.gmane.org/gmane.comp.parsers.spirit.general/9013, the |
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| 13 | // directives gen_ast_node_d and gen_pt_node_d were not working for lack of |
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| 14 | // appropriate conversion constructors in the underlying tree match policies. |
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| 15 | // |
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| 16 | //////////////////////////////////////////////////////////////////////////////// |
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| 17 | |
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| 18 | #include <boost/spirit/core.hpp> |
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| 19 | #include <boost/spirit/tree/ast.hpp> |
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| 20 | #include <boost/spirit/tree/parse_tree.hpp> |
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| 21 | |
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| 22 | using namespace boost::spirit; |
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| 23 | |
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| 24 | struct my_grammar : grammar<my_grammar> |
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| 25 | { |
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| 26 | template <class Scanner> |
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| 27 | struct definition |
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| 28 | { |
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| 29 | typedef |
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| 30 | scanner< |
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| 31 | typename Scanner::iterator_t, |
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| 32 | scanner_policies< |
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| 33 | typename Scanner::iteration_policy_t, |
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| 34 | ast_match_policy< |
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| 35 | typename Scanner::match_policy_t::iterator_t, |
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| 36 | typename Scanner::match_policy_t::factory_t |
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| 37 | >, |
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| 38 | typename Scanner::action_policy_t |
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| 39 | > |
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| 40 | > ast_scanner; |
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| 41 | |
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| 42 | typedef |
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| 43 | scanner< |
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| 44 | typename Scanner::iterator_t, |
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| 45 | scanner_policies< |
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| 46 | typename Scanner::iteration_policy_t, |
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| 47 | pt_match_policy< |
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| 48 | typename Scanner::match_policy_t::iterator_t, |
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| 49 | typename Scanner::match_policy_t::factory_t |
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| 50 | >, |
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| 51 | typename Scanner::action_policy_t |
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| 52 | > |
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| 53 | > pt_scanner; |
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| 54 | |
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| 55 | typedef rule<ast_scanner> ast_rule; |
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| 56 | typedef rule<pt_scanner> pt_rule; |
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| 57 | typedef rule<Scanner> rule_; |
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| 58 | |
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| 59 | definition(my_grammar const & /* self */) |
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| 60 | { |
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| 61 | start_ = gen_ast_node_d[ ast_rule_ ]; |
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| 62 | start_ = gen_pt_node_d[ pt_rule_ ]; |
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| 63 | } |
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| 64 | |
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| 65 | rule_ const & start() const |
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| 66 | { |
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| 67 | return start_; |
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| 68 | } |
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| 69 | |
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| 70 | rule_ start_; |
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| 71 | ast_rule ast_rule_; |
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| 72 | pt_rule pt_rule_; |
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| 73 | }; |
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| 74 | }; |
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| 75 | |
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| 76 | int main() |
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| 77 | { |
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| 78 | const char * begin, * end; |
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| 79 | |
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| 80 | pt_parse(begin, end, my_grammar()); |
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| 81 | ast_parse(begin, end, my_grammar()); |
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| 82 | } |
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