src/encoding.h

   1 // -*- C++ -*-
   2 /* This file is part of
   3  * ======================================================
   4  *
   5  *           LyX, The Document Processor
   6  *
   7  *           Copyright 1995 Matthias Ettrich
   8  *           Copyright 1995-2000 The LyX Team.
   9  *
  10  * ====================================================== */
  11
  12 #ifndef ENCODING_H
  13 #define ENCODING_H
  14
  15 #ifdef __GNUG__
  16 #pragma interface
  17 #endif
  18
  19 #include "LString.h"
  20 #include "lyxrc.h"
  21
  22 typedef unsigned short int Uchar;
  23
  24 class Encoding {
  25 public:
  26         ///
  27         enum Letter_Form {
  28                 FORM_ISOLATED,
  29                 FORM_FINAL,
  30                 FORM_INITIAL,
  31                 FORM_MEDIAL
  32         };
  33         ///
  34         Encoding(string const & l, Uchar const * e)
  35                 : LatexName_(l) , encoding_table(e) {}
  36         ///
  37         string const & LatexName() const {
  38                 return LatexName_;
  39         }
  40         ///
  41         Uchar ucs(unsigned char c) const {
  42                 return encoding_table[c];
  43         }
  44         ///
  45         static
  46         bool IsComposeChar_hebrew(unsigned char c);
  47         ///
  48         static
  49         bool IsComposeChar_arabic(unsigned char c);
  50         ///
  51         static
  52         bool is_arabic(unsigned char c);
  53         ///
  54         static
  55         unsigned char TransformChar(unsigned char c, Letter_Form form);
  56 private:
  57         ///
  58         string LatexName_;
  59         ///
  60         Uchar const * encoding_table;
  61 };
  62
  63
  64 extern Encoding iso8859_1;
  65 extern Encoding iso8859_2;
  66 extern Encoding iso8859_3;
  67 extern Encoding iso8859_4;
  68 extern Encoding iso8859_6;
  69 extern Encoding iso8859_7;
  70 extern Encoding iso8859_9;
  71 extern Encoding cp1255;
  72 extern Encoding koi8;
  73 extern Encoding symbol_encoding;
  74
  75 inline
  76 bool Encoding::IsComposeChar_hebrew(unsigned char c)
  77 {
  78         return c <= 0xd2 && c >= 0xc0 &&
  79                 c != 0xce && c != 0xd0;
  80 }
  81
  82
  83 inline
  84 bool Encoding::IsComposeChar_arabic(unsigned char c)
  85 {
  86         return c >= 0xeb && c <= 0xf2;
  87 }
  88
  89
  90 extern unsigned char arabic_table[][2];
  91 extern unsigned char arabic_table2[][4];
  92 unsigned char const arabic_start = 0xc1;
  93
  94
  95 inline
  96 bool Encoding::is_arabic(unsigned char c)
  97 {
  98         return c >= arabic_start && arabic_table[c-arabic_start][0];
  99 }
 100
 101
 102 inline
 103 unsigned char Encoding::TransformChar(unsigned char c, Encoding::Letter_Form form)
 104 {
 105         if (!is_arabic(c))
 106                 return c;
 107
 108         if (lyxrc.font_norm == "iso10646-1")
 109                 return arabic_table2[c-arabic_start][form];
 110         else
 111                 return arabic_table[c-arabic_start][form >> 1];
 112 }
 113
 114
 115 #endif