[857] | 1 | /*=============================================================================
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| 2 | Copyright (c) 2002-2003 Hartmut Kaiser
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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 | #ifndef BOOST_SPIRIT_REFACTORING_IPP
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| 10 | #define BOOST_SPIRIT_REFACTORING_IPP
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| 11 |
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| 12 | ///////////////////////////////////////////////////////////////////////////////
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| 13 | namespace boost { namespace spirit {
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| 14 |
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| 15 | ///////////////////////////////////////////////////////////////////////////////
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| 16 | //
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| 17 | // The struct 'self_nested_refactoring' is used to indicate, that the
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| 18 | // refactoring algorithm should be 'self-nested'.
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| 19 | //
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| 20 | // The struct 'non_nested_refactoring' is used to indicate, that no nesting
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| 21 | // of refactoring algorithms is reqired.
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| 22 | //
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| 23 | ///////////////////////////////////////////////////////////////////////////////
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| 24 |
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| 25 | struct non_nested_refactoring { typedef non_nested_refactoring embed_t; };
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| 26 | struct self_nested_refactoring { typedef self_nested_refactoring embed_t; };
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| 27 |
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| 28 | ///////////////////////////////////////////////////////////////////////////////
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| 29 | namespace impl {
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| 30 |
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| 31 | ///////////////////////////////////////////////////////////////////////////////
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| 32 | //
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| 33 | // Helper templates for refactoring parsers
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| 34 | //
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| 35 | ///////////////////////////////////////////////////////////////////////////////
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| 36 |
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| 37 | ///////////////////////////////////////////////////////////////////////////
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| 38 | //
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| 39 | // refactor the left unary operand of a binary parser
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| 40 | //
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| 41 | // The refactoring should be done only if the left operand is an
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| 42 | // unary_parser_category parser.
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| 43 | //
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| 44 | ///////////////////////////////////////////////////////////////////////////
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| 45 |
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| 46 | ///////////////////////////////////////////////////////////////////////////
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| 47 | template <typename CategoryT>
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| 48 | struct refactor_unary_nested {
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| 49 |
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| 50 | template <
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| 51 | typename ParserT, typename NestedT,
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| 52 | typename ScannerT, typename BinaryT
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| 53 | >
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| 54 | static typename parser_result<ParserT, ScannerT>::type
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| 55 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary,
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| 56 | NestedT const& /*nested_d*/)
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| 57 | {
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| 58 | return binary.parse(scan);
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| 59 | }
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| 60 | };
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| 61 |
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| 62 | template <>
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| 63 | struct refactor_unary_nested<unary_parser_category> {
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| 64 |
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| 65 | template <
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| 66 | typename ParserT, typename ScannerT, typename BinaryT,
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| 67 | typename NestedT
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| 68 | >
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| 69 | static typename parser_result<ParserT, ScannerT>::type
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| 70 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary,
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| 71 | NestedT const& nested_d)
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| 72 | {
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| 73 | typedef typename BinaryT::parser_generator_t op_t;
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| 74 | typedef
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| 75 | typename BinaryT::left_t::parser_generator_t
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| 76 | unary_t;
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| 77 |
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| 78 | return
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| 79 | unary_t::generate(
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| 80 | nested_d[
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| 81 | op_t::generate(binary.left().subject(), binary.right())
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| 82 | ]
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| 83 | ).parse(scan);
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| 84 | }
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| 85 | };
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| 86 |
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| 87 | ///////////////////////////////////////////////////////////////////////////
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| 88 | template <typename CategoryT>
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| 89 | struct refactor_unary_non_nested {
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| 90 |
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| 91 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 92 | static typename parser_result<ParserT, ScannerT>::type
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| 93 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary)
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| 94 | {
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| 95 | return binary.parse(scan);
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| 96 | }
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| 97 | };
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| 98 |
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| 99 | template <>
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| 100 | struct refactor_unary_non_nested<unary_parser_category> {
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| 101 |
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| 102 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 103 | static typename parser_result<ParserT, ScannerT>::type
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| 104 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary)
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| 105 | {
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| 106 | typedef typename BinaryT::parser_generator_t op_t;
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| 107 | typedef
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| 108 | typename BinaryT::left_t::parser_generator_t
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| 109 | unary_t;
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| 110 |
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| 111 | return unary_t::generate(
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| 112 | op_t::generate(binary.left().subject(), binary.right())
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| 113 | ).parse(scan);
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| 114 | }
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| 115 | };
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| 116 |
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| 117 | ///////////////////////////////////////////////////////////////////////////
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| 118 | template <typename NestedT>
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| 119 | struct refactor_unary_type {
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| 120 |
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| 121 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 122 | static typename parser_result<ParserT, ScannerT>::type
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| 123 | parse(ParserT const &p, ScannerT const& scan, BinaryT const& binary,
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| 124 | NestedT const& nested_d)
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| 125 | {
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| 126 | typedef
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| 127 | typename BinaryT::left_t::parser_category_t
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| 128 | parser_category_t;
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| 129 |
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| 130 | return refactor_unary_nested<parser_category_t>::
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| 131 | parse(p, scan, binary, nested_d);
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| 132 | }
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| 133 | };
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| 134 |
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| 135 | template <>
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| 136 | struct refactor_unary_type<non_nested_refactoring> {
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| 137 |
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| 138 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 139 | static typename parser_result<ParserT, ScannerT>::type
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| 140 | parse(ParserT const &p, ScannerT const& scan, BinaryT const& binary,
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| 141 | non_nested_refactoring const&)
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| 142 | {
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| 143 | typedef
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| 144 | typename BinaryT::left_t::parser_category_t
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| 145 | parser_category_t;
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| 146 |
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| 147 | return refactor_unary_non_nested<parser_category_t>::
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| 148 | parse(p, scan, binary);
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| 149 | }
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| 150 |
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| 151 | };
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| 152 |
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| 153 | template <>
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| 154 | struct refactor_unary_type<self_nested_refactoring> {
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| 155 |
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| 156 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 157 | static typename parser_result<ParserT, ScannerT>::type
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| 158 | parse(ParserT const &p, ScannerT const& scan, BinaryT const& binary,
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| 159 | self_nested_refactoring const &nested_tag)
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| 160 | {
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| 161 | typedef
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| 162 | typename BinaryT::left_t::parser_category_t
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| 163 | parser_category_t;
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| 164 | typedef typename ParserT::parser_generator_t parser_generator_t;
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| 165 |
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| 166 | parser_generator_t nested_d(nested_tag);
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| 167 | return refactor_unary_nested<parser_category_t>::
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| 168 | parse(p, scan, binary, nested_d);
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| 169 | }
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| 170 |
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| 171 | };
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| 172 |
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| 173 | ///////////////////////////////////////////////////////////////////////////
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| 174 | //
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| 175 | // refactor the action on the left operand of a binary parser
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| 176 | //
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| 177 | // The refactoring should be done only if the left operand is an
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| 178 | // action_parser_category parser.
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| 179 | //
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| 180 | ///////////////////////////////////////////////////////////////////////////
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| 181 |
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| 182 | ///////////////////////////////////////////////////////////////////////////
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| 183 | template <typename CategoryT>
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| 184 | struct refactor_action_nested {
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| 185 |
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| 186 | template <
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| 187 | typename ParserT, typename ScannerT, typename BinaryT,
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| 188 | typename NestedT
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| 189 | >
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| 190 | static typename parser_result<ParserT, ScannerT>::type
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| 191 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary,
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| 192 | NestedT const& nested_d)
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| 193 | {
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| 194 | return nested_d[binary].parse(scan);
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| 195 | }
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| 196 | };
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| 197 |
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| 198 | template <>
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| 199 | struct refactor_action_nested<action_parser_category> {
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| 200 |
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| 201 | template <
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| 202 | typename ParserT, typename ScannerT, typename BinaryT,
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| 203 | typename NestedT
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| 204 | >
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| 205 | static typename parser_result<ParserT, ScannerT>::type
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| 206 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary,
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| 207 | NestedT const& nested_d)
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| 208 | {
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| 209 | typedef typename BinaryT::parser_generator_t binary_gen_t;
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| 210 |
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| 211 | return (
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| 212 | nested_d[
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| 213 | binary_gen_t::generate(
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| 214 | binary.left().subject(),
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| 215 | binary.right()
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| 216 | )
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| 217 | ][binary.left().predicate()]
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| 218 | ).parse(scan);
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| 219 | }
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| 220 | };
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| 221 |
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| 222 | ///////////////////////////////////////////////////////////////////////////
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| 223 | template <typename CategoryT>
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| 224 | struct refactor_action_non_nested {
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| 225 |
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| 226 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 227 | static typename parser_result<ParserT, ScannerT>::type
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| 228 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary)
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| 229 | {
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| 230 | return binary.parse(scan);
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| 231 | }
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| 232 | };
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| 233 |
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| 234 | template <>
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| 235 | struct refactor_action_non_nested<action_parser_category> {
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| 236 |
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| 237 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 238 | static typename parser_result<ParserT, ScannerT>::type
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| 239 | parse(ParserT const &, ScannerT const& scan, BinaryT const& binary)
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| 240 | {
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| 241 | typedef typename BinaryT::parser_generator_t binary_gen_t;
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| 242 |
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| 243 | return (
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| 244 | binary_gen_t::generate(
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| 245 | binary.left().subject(),
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| 246 | binary.right()
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| 247 | )[binary.left().predicate()]
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| 248 | ).parse(scan);
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| 249 | }
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| 250 | };
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| 251 |
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| 252 | ///////////////////////////////////////////////////////////////////////////
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| 253 | template <typename NestedT>
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| 254 | struct refactor_action_type {
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| 255 |
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| 256 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 257 | static typename parser_result<ParserT, ScannerT>::type
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| 258 | parse(ParserT const &p, ScannerT const& scan, BinaryT const& binary,
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| 259 | NestedT const& nested_d)
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| 260 | {
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| 261 | typedef
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| 262 | typename BinaryT::left_t::parser_category_t
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| 263 | parser_category_t;
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| 264 |
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| 265 | return refactor_action_nested<parser_category_t>::
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| 266 | parse(p, scan, binary, nested_d);
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| 267 | }
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| 268 | };
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| 269 |
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| 270 | template <>
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| 271 | struct refactor_action_type<non_nested_refactoring> {
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| 272 |
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| 273 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 274 | static typename parser_result<ParserT, ScannerT>::type
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| 275 | parse(ParserT const &p, ScannerT const& scan, BinaryT const& binary,
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| 276 | non_nested_refactoring const&)
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| 277 | {
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| 278 | typedef
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| 279 | typename BinaryT::left_t::parser_category_t
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| 280 | parser_category_t;
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| 281 |
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| 282 | return refactor_action_non_nested<parser_category_t>::
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| 283 | parse(p, scan, binary);
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| 284 | }
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| 285 | };
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| 286 |
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| 287 | template <>
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| 288 | struct refactor_action_type<self_nested_refactoring> {
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| 289 |
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| 290 | template <typename ParserT, typename ScannerT, typename BinaryT>
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| 291 | static typename parser_result<ParserT, ScannerT>::type
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| 292 | parse(ParserT const &p, ScannerT const& scan, BinaryT const& binary,
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| 293 | self_nested_refactoring const &nested_tag)
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| 294 | {
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| 295 | typedef typename ParserT::parser_generator_t parser_generator_t;
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| 296 | typedef
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| 297 | typename BinaryT::left_t::parser_category_t
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| 298 | parser_category_t;
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| 299 |
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| 300 | parser_generator_t nested_d(nested_tag);
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| 301 | return refactor_action_nested<parser_category_t>::
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| 302 | parse(p, scan, binary, nested_d);
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| 303 | }
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| 304 | };
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| 305 |
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| 306 | ///////////////////////////////////////////////////////////////////////////
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| 307 | //
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| 308 | // refactor the action attached to a binary parser
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| 309 | //
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| 310 | // The refactoring should be done only if the given parser is an
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| 311 | // binary_parser_category parser.
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| 312 | //
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| 313 | ///////////////////////////////////////////////////////////////////////////
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| 314 |
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| 315 | ///////////////////////////////////////////////////////////////////////////
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| 316 | template <typename CategoryT>
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| 317 | struct attach_action_nested {
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| 318 |
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| 319 | template <
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| 320 | typename ParserT, typename ScannerT, typename ActionT,
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| 321 | typename NestedT
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| 322 | >
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| 323 | static typename parser_result<ParserT, ScannerT>::type
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| 324 | parse(ParserT const &, ScannerT const& scan, ActionT const &action,
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| 325 | NestedT const& nested_d)
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| 326 | {
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| 327 | return action.parse(scan);
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| 328 | }
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| 329 | };
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| 330 |
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| 331 | template <>
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| 332 | struct attach_action_nested<binary_parser_category> {
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| 333 |
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| 334 | template <
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| 335 | typename ParserT, typename ScannerT, typename ActionT,
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| 336 | typename NestedT
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| 337 | >
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| 338 | static typename parser_result<ParserT, ScannerT>::type
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| 339 | parse(ParserT const &, ScannerT const& scan, ActionT const &action,
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| 340 | NestedT const& nested_d)
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| 341 | {
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| 342 | typedef
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| 343 | typename ActionT::subject_t::parser_generator_t
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| 344 | binary_gen_t;
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| 345 |
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| 346 | return (
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| 347 | binary_gen_t::generate(
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| 348 | nested_d[action.subject().left()[action.predicate()]],
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| 349 | nested_d[action.subject().right()[action.predicate()]]
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| 350 | )
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| 351 | ).parse(scan);
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| 352 | }
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| 353 | };
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| 354 |
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| 355 | ///////////////////////////////////////////////////////////////////////////
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| 356 | template <typename CategoryT>
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| 357 | struct attach_action_non_nested {
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| 358 |
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| 359 | template <typename ParserT, typename ScannerT, typename ActionT>
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| 360 | static typename parser_result<ParserT, ScannerT>::type
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| 361 | parse(ParserT const &, ScannerT const& scan, ActionT const &action)
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| 362 | {
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| 363 | return action.parse(scan);
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| 364 | }
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| 365 | };
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| 366 |
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| 367 | template <>
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| 368 | struct attach_action_non_nested<binary_parser_category> {
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| 369 |
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| 370 | template <typename ParserT, typename ScannerT, typename ActionT>
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| 371 | static typename parser_result<ParserT, ScannerT>::type
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| 372 | parse(ParserT const &, ScannerT const& scan, ActionT const &action)
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| 373 | {
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| 374 | typedef
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| 375 | typename ActionT::subject_t::parser_generator_t
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| 376 | binary_gen_t;
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| 377 |
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| 378 | return (
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| 379 | binary_gen_t::generate(
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| 380 | action.subject().left()[action.predicate()],
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| 381 | action.subject().right()[action.predicate()]
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| 382 | )
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| 383 | ).parse(scan);
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| 384 | }
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| 385 | };
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| 386 |
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| 387 | ///////////////////////////////////////////////////////////////////////////
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| 388 | template <typename NestedT>
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| 389 | struct attach_action_type {
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| 390 |
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| 391 | template <typename ParserT, typename ScannerT, typename ActionT>
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| 392 | static typename parser_result<ParserT, ScannerT>::type
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| 393 | parse(ParserT const &p, ScannerT const& scan, ActionT const& action,
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| 394 | NestedT const& nested_d)
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| 395 | {
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| 396 | typedef
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| 397 | typename ActionT::subject_t::parser_category_t
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| 398 | parser_category_t;
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| 399 |
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| 400 | return attach_action_nested<parser_category_t>::
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| 401 | parse(p, scan, action, nested_d);
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| 402 | }
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| 403 | };
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| 404 |
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| 405 | template <>
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| 406 | struct attach_action_type<non_nested_refactoring> {
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| 407 |
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| 408 | template <typename ParserT, typename ScannerT, typename ActionT>
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| 409 | static typename parser_result<ParserT, ScannerT>::type
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| 410 | parse(ParserT const &p, ScannerT const& scan, ActionT const &action,
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| 411 | non_nested_refactoring const&)
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| 412 | {
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| 413 | typedef
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| 414 | typename ActionT::subject_t::parser_category_t
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| 415 | parser_category_t;
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| 416 |
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| 417 | return attach_action_non_nested<parser_category_t>::
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| 418 | parse(p, scan, action);
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| 419 | }
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| 420 | };
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| 421 |
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| 422 | template <>
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| 423 | struct attach_action_type<self_nested_refactoring> {
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| 424 |
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| 425 | template <typename ParserT, typename ScannerT, typename ActionT>
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| 426 | static typename parser_result<ParserT, ScannerT>::type
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| 427 | parse(ParserT const &p, ScannerT const& scan, ActionT const &action,
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| 428 | self_nested_refactoring const& nested_tag)
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| 429 | {
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| 430 | typedef typename ParserT::parser_generator_t parser_generator_t;
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| 431 | typedef
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| 432 | typename ActionT::subject_t::parser_category_t
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| 433 | parser_category_t;
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| 434 |
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| 435 | parser_generator_t nested_d(nested_tag);
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| 436 | return attach_action_nested<parser_category_t>::
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| 437 | parse(p, scan, action, nested_d);
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| 438 | }
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| 439 | };
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| 440 |
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| 441 | } // namespace impl
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| 442 |
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| 443 | ///////////////////////////////////////////////////////////////////////////////
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| 444 | }} // namespace boost::spirit
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| 445 |
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| 446 | #endif
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| 447 |
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