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_3;
  63 extern Encoding iso8859_4;
  64 extern Encoding iso8859_6;
  65 extern Encoding iso8859_7;
  66 extern Encoding iso8859_9;
  67 extern Encoding cp1255;
  68 extern Encoding koi8;
  69 extern Encoding symbol_encoding;
  70
  71 inline
  72 bool Encoding::IsComposeChar_hebrew(unsigned char c)
  73 {
  74         return c <= 0xd2 && c >= 0xc0 &&
  75                 c != 0xce && c != 0xd0;
  76 }
  77
  78
  79 inline
  80 bool Encoding::IsComposeChar_arabic(unsigned char c)
  81 {
  82         return c >= 0xeb && c <= 0xf2;
  83 }
  84
  85
  86 extern unsigned char arabic_table[][2];
  87 extern unsigned char arabic_table2[][4];
  88 unsigned char const arabic_start = 0xc1;
  89
  90
  91 inline
  92 bool Encoding::is_arabic(unsigned char c)
  93 {
  94         return c >= arabic_start && arabic_table[c-arabic_start][0];
  95 }
  96
  97
  98 inline
  99 unsigned char Encoding::TransformChar(unsigned char c, Encoding::Letter_Form form)
 100 {
 101         if (!is_arabic(c))
 102                 return c;
 103
 104         if (lyxrc.font_norm == "iso10646-1")
 105                 return arabic_table2[c-arabic_start][form];
 106         else
 107                 return arabic_table[c-arabic_start][form >> 1];
 108 }
 109
 110
 111 #endif