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 #include "LString.h"
  16 #include "lyxrc.h"
  17
  18 typedef unsigned short int Uchar;
  19
  20 class Encoding {
  21 public:
  22         ///
  23         enum Letter_Form {
  24                 FORM_ISOLATED,
  25                 FORM_FINAL,
  26                 FORM_INITIAL,
  27                 FORM_MEDIAL
  28         };
  29         ///
  30         Encoding(string const & l, Uchar const * e)
  31                 : LatexName_(l) , encoding_table(e) {}
  32         ///
  33         string const & LatexName() const {
  34                 return LatexName_;
  35         }
  36         ///
  37         Uchar ucs(unsigned char c) const {
  38                 return encoding_table[c];
  39         }
  40         ///
  41         static
  42         bool IsComposeChar_hebrew(unsigned char c);
  43         ///
  44         static
  45         bool IsComposeChar_arabic(unsigned char c);
  46         ///
  47         static
  48         bool is_arabic(unsigned char c);
  49         ///
  50         static
  51         unsigned char TransformChar(unsigned char c, Letter_Form form);
  52 private:
  53         ///
  54         string LatexName_;
  55         ///
  56         Uchar const * encoding_table;
  57 };
  58
  59
  60 extern Encoding iso8859_1;
  61 extern Encoding iso8859_2;
  62 extern Encoding iso8859_4;
  63 extern Encoding iso8859_6;
  64 extern Encoding iso8859_7;
  65 extern Encoding cp1255;
  66 extern Encoding koi8;
  67
  68
  69 inline
  70 bool Encoding::IsComposeChar_hebrew(unsigned char c)
  71 {
  72         return c <= 0xd2 && c >= 0xc0 &&
  73                 c != 0xce && c != 0xd0;
  74 }
  75
  76
  77 inline
  78 bool Encoding::IsComposeChar_arabic(unsigned char c)
  79 {
  80         return c >= 0xeb && c <= 0xf2;
  81 }
  82
  83
  84 extern unsigned char arabic_table[][2];
  85 extern unsigned char arabic_table2[][4];
  86 unsigned char const arabic_start = 0xc1;
  87
  88
  89 inline
  90 bool Encoding::is_arabic(unsigned char c)
  91 {
  92         return c >= arabic_start && arabic_table[c-arabic_start][0];
  93 }
  94
  95
  96 inline
  97 unsigned char Encoding::TransformChar(unsigned char c, Encoding::Letter_Form form)
  98 {
  99         if (!is_arabic(c))
 100                 return c;
 101
 102         if (lyxrc.font_norm == "iso10646-1")
 103                 return arabic_table2[c-arabic_start][form];
 104         else
 105                 return arabic_table[c-arabic_start][form >> 1];
 106 }
 107
 108
 109 #endif