lib/Unicode.hh

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 // Unicode.hh for Blackbox - an X11 Window manager
   3 // Copyright (c) 2001 - 2005 Sean 'Shaleh' Perry <shaleh@debian.org>
   4 // Copyright (c) 1997 - 2000, 2002 - 2005
   5 //         Bradley T Hughes <bhughes at trolltech.com>
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining a
   8 // copy of this software and associated documentation files (the "Software"),
   9 // to deal in the Software without restriction, including without limitation
  10 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11 // and/or sell copies of the Software, and to permit persons to whom the
  12 // Software is furnished to do so, subject to the following conditions:
  13 //
  14 // The above copyright notice and this permission notice shall be included in
  15 // all copies or substantial portions of the Software.
  16 //
  17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23 // DEALINGS IN THE SOFTWARE.
  24
  25 #ifndef __Unicode_hh
  26 #define __Unicode_hh
  27
  28 #include <string>
  29
  30 namespace bt
  31 {
  32   /*
  33    * Returns true if the system supports Unicode conversions.
  34    */
  35   bool hasUnicode();
  36
  37   /*
  38    * Unicode character type.
  39    */
  40   typedef unsigned int Uchar;
  41
  42   /*
  43    * Unicode string type.
  44    */
  45   typedef std::basic_string<Uchar> ustring;
  46
  47   /*
  48    * Converts multibyte locale-encoded string to wide-char Unicode
  49    * string (aka UTF-32).
  50    */
  51   ustring toUnicode(const std::string &string);
  52
  53   /*
  54    * Converts wide-char Unicode string (aka UTF-32) to multibyte
  55    * locale-encoded string.
  56    */
  57   std::string toLocale(const ustring &string);
  58
  59   /*
  60    * Converts UTF-32 to UTF-8.
  61    */
  62   std::string toUtf8(const ustring &utf32);
  63
  64   /*
  65    * Convert UTF-8 to UTF-32.
  66    */
  67   ustring toUtf32(const std::string &utf8);
  68
  69 } // namespace bt
  70
  71 /*
  72  * Workaround incomplete std::char_traits<> implementation in come
  73  * versions of the GNU C++ compiler.
  74  */
  75 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  76 #  if __GNUC__ == 3
  77 namespace std {
  78
  79   template<>
  80   struct char_traits<bt::Uchar>
  81   {
  82     typedef bt::Uchar    char_type;
  83     typedef unsigned int int_type;
  84     typedef streampos    pos_type;
  85     typedef streamoff    off_type;
  86     typedef mbstate_t    state_type;
  87
  88     static void
  89     assign(bt::Uchar &c1, const bt::Uchar &c2)
  90     { c1 = c2; }
  91
  92     static bool
  93     eq(const bt::Uchar &c1, const bt::Uchar &c2)
  94     { return c1 == c2; }
  95
  96     static bool
  97     lt(const bt::Uchar &c1, const bt::Uchar &c2)
  98     { return c1 < c2; }
  99
 100     static int
 101     compare(const bt::Uchar *s1, const bt::Uchar *s2, size_t n) {
 102       for (size_t x = 0; x < n; ++x) {
 103         if (lt(s1[x], s2[x]))
 104           return -1;
 105         if (lt(s2[x], s1[x]))
 106           return 1;
 107       }
 108       return 0;
 109     }
 110
 111     static size_t
 112     length(const bt::Uchar *s)
 113     {
 114       size_t x = 0;
 115       while (!eq(s[x], bt::Uchar()))
 116         ++x;
 117       return x;
 118     }
 119
 120     static const bt::Uchar *
 121     find(const bt::Uchar *s, std::size_t n, const bt::Uchar &c)
 122     {
 123       for (std::size_t x = 0; x < n; ++x)
 124         if (eq(s[x], c))
 125           return s + x;
 126       return 0;
 127     }
 128
 129     static bt::Uchar *
 130     move(bt::Uchar *d, const bt::Uchar *s, std::size_t n) {
 131       return (static_cast<bt::Uchar *>
 132               (std::memmove(d, s, n  *sizeof(bt::Uchar ))));
 133     }
 134
 135     static bt::Uchar *
 136     copy(bt::Uchar *d, const bt::Uchar *s, std::size_t n) {
 137       std::copy(s, s + n, d);
 138       return d;
 139     }
 140
 141     static bt::Uchar *
 142     assign(bt::Uchar *s, std::size_t n, bt::Uchar c) {
 143       std::fill_n(s, n, c);
 144       return s;
 145     }
 146
 147     static bt::Uchar
 148     to_char_type(const unsigned int &c)
 149     { return c; }
 150
 151     static unsigned int
 152     to_int_type(const bt::Uchar &c)
 153     { return c; }
 154
 155     static bool
 156     eq_int_type(const unsigned int &c1, const unsigned int &c2)
 157     { return c1 == c2; }
 158
 159     static int_type
 160     eof()
 161     { return static_cast<unsigned int>(EOF); }
 162
 163     static unsigned int
 164     not_eof(const unsigned int &c)
 165     { return (c == eof()) ? 0 : c; }
 166
 167   };
 168
 169 } // namespace std
 170 #  endif // __GNUC__ == 3
 171 #endif // __GNUC__ && !__INTEL_COMPILER
 172
 173 #endif // __Unicode_hh