[29] | 1 | /*============================================================================= |
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| 2 | Copyright (c) 2004 Angus Leeming |
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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 | |
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| 10 | /////////////////////////////////////////////////////////////////////////////// |
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| 11 | // |
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| 12 | // The switch_p parser was broken sometime during the boost 1.32 development |
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| 13 | // cycle. This little program tests it, the for_p parser and the limit_d |
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| 14 | // directive. |
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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/dynamic/for.hpp> |
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| 20 | #include <boost/spirit/dynamic/switch.hpp> |
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| 21 | #include <boost/spirit/iterator/position_iterator.hpp> |
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| 22 | #include <boost/spirit/utility/confix.hpp> |
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| 23 | |
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| 24 | #include <boost/spirit/phoenix.hpp> |
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| 25 | |
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| 26 | #include <iostream> |
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| 27 | #include <string> |
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| 28 | |
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| 29 | namespace spirit = boost::spirit; |
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| 30 | |
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| 31 | typedef unsigned int uint; |
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| 32 | |
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| 33 | struct switch_grammar : public spirit::grammar<switch_grammar> { |
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| 34 | template <typename ScannerT> |
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| 35 | struct definition { |
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| 36 | definition(switch_grammar const & self); |
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| 37 | |
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| 38 | typedef spirit::rule<ScannerT> rule_t; |
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| 39 | rule_t const & start() const { return expression; } |
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| 40 | |
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| 41 | private: |
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| 42 | rule_t expression; |
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| 43 | uint index; |
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| 44 | uint nnodes; |
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| 45 | }; |
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| 46 | }; |
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| 47 | |
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| 48 | |
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| 49 | template <typename ScannerT> |
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| 50 | switch_grammar::definition<ScannerT>::definition(switch_grammar const & self) |
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| 51 | { |
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| 52 | using boost::cref; |
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| 53 | |
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| 54 | using phoenix::arg1; |
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| 55 | using phoenix::var; |
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| 56 | |
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| 57 | using spirit::case_p; |
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| 58 | using spirit::for_p; |
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| 59 | using spirit::limit_d; |
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| 60 | using spirit::str_p; |
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| 61 | using spirit::switch_p; |
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| 62 | using spirit::uint_p; |
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| 63 | |
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| 64 | expression = |
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| 65 | str_p("NNODES") >> |
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| 66 | uint_p[var(nnodes) = arg1] >> |
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| 67 | |
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| 68 | for_p(var(index) = 1, |
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| 69 | var(index) <= var(nnodes), |
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| 70 | var(index)++) |
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| 71 | [ |
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| 72 | limit_d(cref(index), cref(index))[uint_p] >> |
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| 73 | |
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| 74 | switch_p[ |
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| 75 | case_p<'s'>(uint_p), |
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| 76 | case_p<'d'>(uint_p), |
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| 77 | case_p<'n'>(uint_p) |
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| 78 | ] |
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| 79 | ]; |
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| 80 | } |
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| 81 | |
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| 82 | |
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| 83 | int main() |
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| 84 | { |
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| 85 | std::string const data("NNODES 3\n" |
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| 86 | "1 s 1\n" |
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| 87 | "2 d 2\n" |
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| 88 | "3 n 3"); // JDG 10-18-2005 removed trailing \n to |
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| 89 | // avoid post skip problems |
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| 90 | |
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| 91 | typedef spirit::position_iterator<std::string::const_iterator> |
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| 92 | iterator_t; |
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| 93 | |
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| 94 | spirit::parse_info<iterator_t> const info = |
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| 95 | parse(iterator_t(data.begin(), data.end(), "switch test"), |
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| 96 | iterator_t(), |
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| 97 | switch_grammar(), |
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| 98 | spirit::space_p); |
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| 99 | |
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| 100 | if (!info.full) { |
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| 101 | spirit::file_position const fp = info.stop.get_position(); |
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| 102 | std::cerr << "Parsing failed at line " << fp.line |
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| 103 | << ", column " << fp.column << ".\n"; |
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| 104 | } |
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| 105 | |
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| 106 | return info.full ? 0 : 1; |
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| 107 | } |
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