[857] | 1 | /*=============================================================================
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| 2 | Copyright (c) 2002-2003 Joel de Guzman
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| 3 | Copyright (c) 2002-2003 Hartmut Kaiser
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| 4 | Copyright (c) 2003 Martin Wille
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| 5 | http://spirit.sourceforge.net/
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| 6 |
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| 7 | Use, modification and distribution is subject to the Boost Software
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| 8 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 9 | http://www.boost.org/LICENSE_1_0.txt)
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| 10 | =============================================================================*/
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| 11 | #if !defined(BOOST_SPIRIT_PARSER_TRAITS_IPP)
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| 12 | #define BOOST_SPIRIT_PARSER_TRAITS_IPP
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| 13 |
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| 14 | #include <boost/spirit/core/composite/operators.hpp>
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| 15 |
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| 16 | ///////////////////////////////////////////////////////////////////////////////
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| 17 | namespace boost { namespace spirit {
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| 18 |
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| 19 | namespace impl
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| 20 | {
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| 21 |
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| 22 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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| 23 |
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| 24 | ///////////////////////////////////////////////////////////////////////////
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| 25 | //
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| 26 | // from spirit 1.1 (copyright (c) 2001 Bruce Florman)
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| 27 | // various workarounds to support compile time decisions without partial
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| 28 | // template specialization whether a given type is an instance of a
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| 29 | // concrete parser type.
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| 30 | //
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| 31 | ///////////////////////////////////////////////////////////////////////////
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| 32 |
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| 33 | ///////////////////////////////////////////////////////////////////////////
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| 34 | template <typename T>
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| 35 | struct parser_type_traits
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| 36 | {
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| 37 | // Determine at compile time (without partial specialization)
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| 38 | // whether a given type is an instance of the alternative<A,B>
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| 39 |
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| 40 | static T t();
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| 41 |
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| 42 | typedef struct { char dummy[1]; } size1_t;
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| 43 | typedef struct { char dummy[2]; } size2_t;
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| 44 | typedef struct { char dummy[3]; } size3_t;
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| 45 | typedef struct { char dummy[4]; } size4_t;
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| 46 | typedef struct { char dummy[5]; } size5_t;
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| 47 | typedef struct { char dummy[6]; } size6_t;
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| 48 | typedef struct { char dummy[7]; } size7_t;
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| 49 | typedef struct { char dummy[8]; } size8_t;
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| 50 | typedef struct { char dummy[9]; } size9_t;
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| 51 | typedef struct { char dummy[10]; } size10_t;
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| 52 |
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| 53 | // the following functions need no implementation
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| 54 | template <typename A, typename B>
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| 55 | static size1_t test_(alternative<A, B> const&);
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| 56 | template <typename A, typename B>
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| 57 | static size2_t test_(sequence<A, B> const&);
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| 58 | template <typename A, typename B>
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| 59 | static size3_t test_(sequential_or<A, B> const&);
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| 60 | template <typename A, typename B>
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| 61 | static size4_t test_(intersection<A, B> const&);
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| 62 | template <typename A, typename B>
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| 63 | static size5_t test_(difference<A, B> const&);
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| 64 | template <typename A, typename B>
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| 65 | static size6_t test_(exclusive_or<A, B> const&);
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| 66 | template <typename S>
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| 67 | static size7_t test_(optional<S> const&);
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| 68 | template <typename S>
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| 69 | static size8_t test_(kleene_star<S> const&);
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| 70 | template <typename S>
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| 71 | static size9_t test_(positive<S> const&);
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| 72 |
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| 73 | static size10_t test_(...);
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| 74 |
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| 75 | BOOST_STATIC_CONSTANT(bool,
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| 76 | is_alternative = (sizeof(size1_t) == sizeof(test_(t()))) );
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| 77 | BOOST_STATIC_CONSTANT(bool,
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| 78 | is_sequence = (sizeof(size2_t) == sizeof(test_(t()))) );
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| 79 | BOOST_STATIC_CONSTANT(bool,
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| 80 | is_sequential_or = (sizeof(size3_t) == sizeof(test_(t()))) );
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| 81 | BOOST_STATIC_CONSTANT(bool,
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| 82 | is_intersection = (sizeof(size4_t) == sizeof(test_(t()))) );
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| 83 | BOOST_STATIC_CONSTANT(bool,
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| 84 | is_difference = (sizeof(size5_t) == sizeof(test_(t()))) );
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| 85 | BOOST_STATIC_CONSTANT(bool,
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| 86 | is_exclusive_or = (sizeof(size6_t) == sizeof(test_(t()))) );
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| 87 | BOOST_STATIC_CONSTANT(bool,
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| 88 | is_optional = (sizeof(size7_t) == sizeof(test_(t()))) );
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| 89 | BOOST_STATIC_CONSTANT(bool,
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| 90 | is_kleene_star = (sizeof(size8_t) == sizeof(test_(t()))) );
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| 91 | BOOST_STATIC_CONSTANT(bool,
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| 92 | is_positive = (sizeof(size9_t) == sizeof(test_(t()))) );
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| 93 | };
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| 94 |
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| 95 | #else
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| 96 |
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| 97 | ///////////////////////////////////////////////////////////////////////////
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| 98 | struct parser_type_traits_base {
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| 99 |
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| 100 | BOOST_STATIC_CONSTANT(bool, is_alternative = false);
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| 101 | BOOST_STATIC_CONSTANT(bool, is_sequence = false);
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| 102 | BOOST_STATIC_CONSTANT(bool, is_sequential_or = false);
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| 103 | BOOST_STATIC_CONSTANT(bool, is_intersection = false);
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| 104 | BOOST_STATIC_CONSTANT(bool, is_difference = false);
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| 105 | BOOST_STATIC_CONSTANT(bool, is_exclusive_or = false);
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| 106 | BOOST_STATIC_CONSTANT(bool, is_optional = false);
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| 107 | BOOST_STATIC_CONSTANT(bool, is_kleene_star = false);
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| 108 | BOOST_STATIC_CONSTANT(bool, is_positive = false);
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| 109 | };
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| 110 |
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| 111 | template <typename ParserT>
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| 112 | struct parser_type_traits : public parser_type_traits_base {
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| 113 |
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| 114 | // no definition here, fallback for all not explicitly mentioned parser
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| 115 | // types
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| 116 | };
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| 117 |
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| 118 | template <typename A, typename B>
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| 119 | struct parser_type_traits<alternative<A, B> >
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| 120 | : public parser_type_traits_base {
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| 121 |
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| 122 | BOOST_STATIC_CONSTANT(bool, is_alternative = true);
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| 123 | };
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| 124 |
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| 125 | template <typename A, typename B>
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| 126 | struct parser_type_traits<sequence<A, B> >
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| 127 | : public parser_type_traits_base {
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| 128 |
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| 129 | BOOST_STATIC_CONSTANT(bool, is_sequence = true);
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| 130 | };
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| 131 |
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| 132 | template <typename A, typename B>
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| 133 | struct parser_type_traits<sequential_or<A, B> >
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| 134 | : public parser_type_traits_base {
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| 135 |
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| 136 | BOOST_STATIC_CONSTANT(bool, is_sequential_or = true);
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| 137 | };
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| 138 |
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| 139 | template <typename A, typename B>
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| 140 | struct parser_type_traits<intersection<A, B> >
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| 141 | : public parser_type_traits_base {
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| 142 |
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| 143 | BOOST_STATIC_CONSTANT(bool, is_intersection = true);
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| 144 | };
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| 145 |
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| 146 | template <typename A, typename B>
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| 147 | struct parser_type_traits<difference<A, B> >
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| 148 | : public parser_type_traits_base {
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| 149 |
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| 150 | BOOST_STATIC_CONSTANT(bool, is_difference = true);
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| 151 | };
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| 152 |
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| 153 | template <typename A, typename B>
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| 154 | struct parser_type_traits<exclusive_or<A, B> >
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| 155 | : public parser_type_traits_base {
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| 156 |
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| 157 | BOOST_STATIC_CONSTANT(bool, is_exclusive_or = true);
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| 158 | };
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| 159 |
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| 160 | template <typename S>
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| 161 | struct parser_type_traits<optional<S> >
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| 162 | : public parser_type_traits_base {
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| 163 |
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| 164 | BOOST_STATIC_CONSTANT(bool, is_optional = true);
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| 165 | };
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| 166 |
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| 167 | template <typename S>
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| 168 | struct parser_type_traits<kleene_star<S> >
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| 169 | : public parser_type_traits_base {
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| 170 |
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| 171 | BOOST_STATIC_CONSTANT(bool, is_kleene_star = true);
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| 172 | };
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| 173 |
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| 174 | template <typename S>
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| 175 | struct parser_type_traits<positive<S> >
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| 176 | : public parser_type_traits_base {
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| 177 |
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| 178 | BOOST_STATIC_CONSTANT(bool, is_positive = true);
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| 179 | };
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| 180 |
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| 181 | #endif // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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| 182 | } // namespace impl
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| 183 |
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| 184 | ///////////////////////////////////////////////////////////////////////////////
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| 185 | }} // namespace boost::spirit
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| 186 |
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| 187 | #endif // !defined(BOOST_SPIRIT_PARSER_TRAITS_IPP)
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