ceph/src/boost/boost/spirit/home/x3/char/char_set.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2014 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_SPIRIT_X3_CHAR_SET_OCT_12_2014_1051AM)
   8 #define BOOST_SPIRIT_X3_CHAR_SET_OCT_12_2014_1051AM
   9
  10 #include <boost/spirit/home/x3/char/char_parser.hpp>
  11 #include <boost/spirit/home/x3/char/detail/cast_char.hpp>
  12 #include <boost/spirit/home/x3/support/traits/string_traits.hpp>
  13 #include <boost/spirit/home/x3/support/utility/utf8.hpp>
  14 #include <boost/spirit/home/x3/support/no_case.hpp>
  15 #include <boost/spirit/home/support/char_set/basic_chset.hpp>
  16
  17 #include <boost/type_traits/is_same.hpp>
  18
  19 namespace boost { namespace spirit { namespace x3
  20 {
  21     ///////////////////////////////////////////////////////////////////////////
  22     // Parser for a character range
  23     ///////////////////////////////////////////////////////////////////////////
  24     template <typename Encoding, typename Attribute = typename Encoding::char_type>
  25     struct char_range
  26       : char_parser< char_range<Encoding, Attribute> >
  27     {
  28
  29         typedef typename Encoding::char_type char_type;
  30         typedef Encoding encoding;
  31         typedef Attribute attribute_type;
  32         static bool const has_attribute =
  33             !is_same<unused_type, attribute_type>::value;
  34
  35
  36         constexpr char_range(char_type from_, char_type to_)
  37           : from(from_), to(to_) {}
  38
  39         template <typename Char, typename Context>
  40         bool test(Char ch_, Context const& context) const
  41         {
  42
  43             char_type ch = char_type(ch_);  // optimize for token based parsing
  44             return (get_case_compare<encoding>(context)(ch, from) >= 0)
  45                && (get_case_compare<encoding>(context)(ch , to) <= 0);
  46         }
  47
  48         char_type from, to;
  49     };
  50
  51
  52     ///////////////////////////////////////////////////////////////////////////
  53     // Parser for a character set
  54     ///////////////////////////////////////////////////////////////////////////
  55     template <typename Encoding, typename Attribute = typename Encoding::char_type>
  56     struct char_set : char_parser<char_set<Encoding, Attribute>>
  57     {
  58         typedef typename Encoding::char_type char_type;
  59         typedef Encoding encoding;
  60         typedef Attribute attribute_type;
  61         static bool const has_attribute =
  62             !is_same<unused_type, attribute_type>::value;
  63
  64         template <typename String>
  65         char_set(String const& str)
  66         {
  67             using spirit::x3::detail::cast_char;
  68
  69             auto* definition = traits::get_c_string(str);
  70             auto ch = *definition++;
  71             while (ch)
  72             {
  73                 auto next = *definition++;
  74                 if (next == '-')
  75                 {
  76                     next = *definition++;
  77                     if (next == 0)
  78                     {
  79                         chset.set(cast_char<char_type>(ch));
  80                         chset.set('-');
  81                         break;
  82                     }
  83                     chset.set(
  84                         cast_char<char_type>(ch),
  85                         cast_char<char_type>(next)
  86                     );
  87                 }
  88                 else
  89                 {
  90                     chset.set(cast_char<char_type>(ch));
  91                 }
  92                 ch = next;
  93             }
  94         }
  95
  96         template <typename Char, typename Context>
  97         bool test(Char ch_, Context const& context) const
  98         {
  99             return get_case_compare<encoding>(context).in_set(ch_, chset);
 100         }
 101
 102         support::detail::basic_chset<char_type> chset;
 103     };
 104
 105     template <typename Encoding, typename Attribute>
 106     struct get_info<char_set<Encoding, Attribute>>
 107     {
 108         typedef std::string result_type;
 109         std::string operator()(char_set<Encoding, Attribute> const& /* p */) const
 110         {
 111             return "char-set";
 112         }
 113     };
 114
 115     template <typename Encoding, typename Attribute>
 116     struct get_info<char_range<Encoding, Attribute>>
 117     {
 118         typedef std::string result_type;
 119         std::string operator()(char_range<Encoding, Attribute> const& p) const
 120         {
 121             return "char_range \"" + to_utf8(Encoding::toucs4(p.from)) + '-' + to_utf8(Encoding::toucs4(p.to))+ '"';
 122         }
 123     };
 124
 125 }}}
 126
 127 #endif