ceph/src/boost/libs/spirit/include/boost/spirit/home/x3/support/no_case.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_SUPPORT_NO_CASE_SEPT_24_2014_1125PM)
   8 #define BOOST_SPIRIT_X3_SUPPORT_NO_CASE_SEPT_24_2014_1125PM
   9
  10 #include <boost/spirit/home/x3/support/unused.hpp>
  11 #include <boost/spirit/home/x3/support/context.hpp>
  12 #include <boost/spirit/home/x3/char/char_class_tags.hpp>
  13
  14 namespace boost { namespace spirit { namespace x3
  15 {
  16     struct no_case_tag {};
  17
  18     template <typename Encoding>
  19     struct case_compare
  20     {
  21         template < template <typename> class basic_charset>
  22         typename Encoding::char_type
  23         in_set( typename Encoding::char_type const ch
  24               , basic_charset<typename Encoding::char_type> const &set)
  25         {
  26             return set.test(ch);
  27         }
  28
  29         int32_t operator()(
  30               typename Encoding::char_type const lc
  31             , typename Encoding::char_type const rc) const
  32         {
  33             return lc - rc;
  34         }
  35
  36
  37         template <typename CharClassTag>
  38         CharClassTag get_char_class_tag(CharClassTag tag) const
  39         {
  40             return tag;
  41         }
  42     };
  43
  44     template <typename Encoding>
  45     struct no_case_compare
  46     {
  47         template < template <typename> class basic_charset>
  48         typename Encoding::char_type
  49         in_set( typename Encoding::char_type const ch
  50               , basic_charset<typename Encoding::char_type> const &set)
  51         {
  52             return set.test(ch)
  53                 || set.test(Encoding::islower(ch) ? Encoding::toupper(ch) : Encoding::tolower(ch));
  54         }
  55
  56         int32_t operator()(
  57               typename Encoding::char_type const lc
  58             , typename Encoding::char_type const rc) const
  59         {
  60             return Encoding::islower(rc) ? Encoding::tolower(lc) - rc : Encoding::toupper(lc) - rc;
  61         }
  62
  63         template <typename CharClassTag>
  64         CharClassTag get_char_class_tag(CharClassTag tag) const
  65         {
  66             return tag;
  67         }
  68
  69         alpha_tag get_char_class_tag(lower_tag ) const
  70         {
  71             return {};
  72         }
  73
  74         alpha_tag get_char_class_tag(upper_tag ) const
  75         {
  76             return {};
  77         }
  78
  79     };
  80
  81     template <typename Encoding>
  82     case_compare<Encoding> get_case_compare_impl(unused_type const&)
  83     {
  84         return {};
  85     }
  86
  87     template <typename Encoding>
  88     no_case_compare<Encoding> get_case_compare_impl(no_case_tag const&)
  89     {
  90         return {};
  91     }
  92
  93     template <typename Encoding, typename Context>
  94     inline decltype(auto) get_case_compare(Context const& context)
  95     {
  96         return get_case_compare_impl<Encoding>(x3::get<no_case_tag>(context));
  97     }
  98     auto const no_case_compare_ = no_case_tag{};
  99
 100 }}}
 101
 102 #endif