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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