[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_LISTS_IPP
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| 10 | #define BOOST_SPIRIT_LISTS_IPP
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| 11 |
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| 12 | ///////////////////////////////////////////////////////////////////////////////
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| 13 | #include <boost/spirit/meta/refactoring.hpp>
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| 14 |
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| 15 | ///////////////////////////////////////////////////////////////////////////////
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| 16 | namespace boost { namespace spirit {
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| 17 |
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| 18 | ///////////////////////////////////////////////////////////////////////////////
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| 19 | //
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| 20 | // list_parser_type class implementation
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| 21 | //
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| 22 | ///////////////////////////////////////////////////////////////////////////////
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| 23 | struct no_list_endtoken { typedef no_list_endtoken embed_t; };
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| 24 |
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| 25 | namespace impl {
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| 26 |
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| 27 | ///////////////////////////////////////////////////////////////////////////////
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| 28 | //
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| 29 | // Refactor the original list item parser
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| 30 | //
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| 31 | ///////////////////////////////////////////////////////////////////////////////
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| 32 |
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| 33 | // match list with 'extended' syntax
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| 34 | template <typename EndT>
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| 35 | struct select_list_parse_refactor {
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| 36 |
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| 37 | template <
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| 38 | typename ParserT, typename ScannerT,
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| 39 | typename ItemT, typename DelimT
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| 40 | >
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| 41 | static typename parser_result<ParserT, ScannerT>::type
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| 42 | parse(ScannerT const& scan, ParserT const& /*p*/,
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| 43 | ItemT const &item, DelimT const &delim, EndT const &end)
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| 44 | {
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| 45 | typedef refactor_action_gen<refactor_unary_gen<> > refactor_t;
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| 46 | const refactor_t refactor_item_d = refactor_t(refactor_unary_d);
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| 47 |
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| 48 | return (
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| 49 | refactor_item_d[item - (end | delim)]
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| 50 | >> *(delim >> refactor_item_d[item - (end | delim)])
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| 51 | >> !(delim >> end)
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| 52 | ).parse(scan);
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| 53 | }
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| 54 | };
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| 55 |
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| 56 | // match list with 'normal' syntax (without an 'end' parser)
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| 57 | template <>
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| 58 | struct select_list_parse_refactor<no_list_endtoken> {
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| 59 |
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| 60 | template <
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| 61 | typename ParserT, typename ScannerT,
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| 62 | typename ItemT, typename DelimT
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| 63 | >
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| 64 | static typename parser_result<ParserT, ScannerT>::type
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| 65 | parse(ScannerT const& scan, ParserT const& /*p*/,
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| 66 | ItemT const &item, DelimT const &delim, no_list_endtoken const&)
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| 67 | {
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| 68 | typedef refactor_action_gen<refactor_unary_gen<> > refactor_t;
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| 69 | const refactor_t refactor_item_d = refactor_t(refactor_unary_d);
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| 70 |
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| 71 | return (
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| 72 | refactor_item_d[item - delim]
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| 73 | >> *(delim >> refactor_item_d[item - delim])
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| 74 | ).parse(scan);
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| 75 | }
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| 76 | };
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| 77 |
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| 78 | ///////////////////////////////////////////////////////////////////////////////
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| 79 | //
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| 80 | // Do not refactor the original list item parser.
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| 81 | //
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| 82 | ///////////////////////////////////////////////////////////////////////////////
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| 83 |
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| 84 | // match list with 'extended' syntax
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| 85 | template <typename EndT>
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| 86 | struct select_list_parse_no_refactor {
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| 87 |
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| 88 | template <
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| 89 | typename ParserT, typename ScannerT,
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| 90 | typename ItemT, typename DelimT
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| 91 | >
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| 92 | static typename parser_result<ParserT, ScannerT>::type
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| 93 | parse(ScannerT const& scan, ParserT const& /*p*/,
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| 94 | ItemT const &item, DelimT const &delim, EndT const &end)
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| 95 | {
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| 96 | return (
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| 97 | (item - (end | delim))
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| 98 | >> *(delim >> (item - (end | delim)))
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| 99 | >> !(delim >> end)
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| 100 | ).parse(scan);
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| 101 | }
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| 102 | };
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| 103 |
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| 104 | // match list with 'normal' syntax (without an 'end' parser)
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| 105 | template <>
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| 106 | struct select_list_parse_no_refactor<no_list_endtoken> {
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| 107 |
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| 108 | template <
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| 109 | typename ParserT, typename ScannerT,
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| 110 | typename ItemT, typename DelimT
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| 111 | >
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| 112 | static typename parser_result<ParserT, ScannerT>::type
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| 113 | parse(ScannerT const& scan, ParserT const& /*p*/,
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| 114 | ItemT const &item, DelimT const &delim, no_list_endtoken const&)
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| 115 | {
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| 116 | return (
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| 117 | (item - delim)
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| 118 | >> *(delim >> (item - delim))
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| 119 | ).parse(scan);
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| 120 | }
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| 121 | };
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| 122 |
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| 123 | // the refactoring is handled by the refactoring parsers, so here there
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| 124 | // is no need to pay attention to these issues.
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| 125 |
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| 126 | template <typename CategoryT>
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| 127 | struct list_parser_type {
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| 128 |
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| 129 | template <
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| 130 | typename ParserT, typename ScannerT,
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| 131 | typename ItemT, typename DelimT, typename EndT
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| 132 | >
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| 133 | static typename parser_result<ParserT, ScannerT>::type
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| 134 | parse(ScannerT const& scan, ParserT const& p,
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| 135 | ItemT const &item, DelimT const &delim, EndT const &end)
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| 136 | {
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| 137 | return select_list_parse_refactor<EndT>::
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| 138 | parse(scan, p, item, delim, end);
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| 139 | }
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| 140 | };
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| 141 |
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| 142 | template <>
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| 143 | struct list_parser_type<plain_parser_category> {
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| 144 |
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| 145 | template <
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| 146 | typename ParserT, typename ScannerT,
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| 147 | typename ItemT, typename DelimT, typename EndT
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| 148 | >
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| 149 | static typename parser_result<ParserT, ScannerT>::type
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| 150 | parse(ScannerT const& scan, ParserT const& p,
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| 151 | ItemT const &item, DelimT const &delim, EndT const &end)
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| 152 | {
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| 153 | return select_list_parse_no_refactor<EndT>::
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| 154 | parse(scan, p, item, delim, end);
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| 155 | }
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| 156 | };
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| 157 |
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| 158 | } // namespace impl
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| 159 |
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| 160 | ///////////////////////////////////////////////////////////////////////////////
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| 161 | }} // namespace boost::spirit
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| 162 |
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| 163 | #endif
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| 164 |
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