dlls/usp10/indic.c

   1 /*
   2  * Implementation of Indic Syllables for the Uniscribe Script Processor
   3  *
   4  * Copyright 2011 CodeWeavers, Aric Stewart
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  */
  21 #include "config.h"
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winuser.h"
  29 #include "wingdi.h"
  30 #include "winnls.h"
  31 #include "usp10.h"
  32 #include "winternl.h"
  33
  34 #include "wine/debug.h"
  35 #include "usp10_internal.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(uniscribe);
  38
  39 static void debug_output_string(LPCWSTR str, int cChar, lexical_function f)
  40 {
  41     int i;
  42     if (TRACE_ON(uniscribe))
  43     {
  44         for (i = 0; i < cChar; i++)
  45         {
  46             switch (f(str[i]))
  47             {
  48                 case lex_Consonant: TRACE("C"); break;
  49                 case lex_Ra: TRACE("Ra"); break;
  50                 case lex_Vowel: TRACE("V"); break;
  51                 case lex_Nukta: TRACE("N"); break;
  52                 case lex_Halant: TRACE("H"); break;
  53                 case lex_ZWNJ: TRACE("Zwnj"); break;
  54                 case lex_ZWJ: TRACE("Zwj"); break;
  55                 case lex_Matra_post: TRACE("Mp");break;
  56                 case lex_Matra_above: TRACE("Ma");break;
  57                 case lex_Matra_below: TRACE("Mb");break;
  58                 case lex_Matra_pre: TRACE("Mm");break;
  59                 case lex_Modifier: TRACE("Sm"); break;
  60                 case lex_Vedic: TRACE("Vd"); break;
  61                 case lex_Anudatta: TRACE("A"); break;
  62                 case lex_Composed_Vowel: TRACE("t"); break;
  63                 default:
  64                     TRACE("X"); break;
  65             }
  66         }
  67         TRACE("\n");
  68     }
  69 }
  70
  71 static inline BOOL is_consonant( int type )
  72 {
  73     return (type == lex_Ra || type == lex_Consonant);
  74 }
  75
  76 static inline BOOL is_matra( int type )
  77 {
  78     return (type == lex_Matra_above || type == lex_Matra_below ||
  79             type == lex_Matra_pre || type == lex_Matra_post);
  80 }
  81
  82 static inline BOOL is_joiner( int type )
  83 {
  84     return (type == lex_ZWJ || type == lex_ZWNJ);
  85 }
  86
  87 static INT consonant_header(LPCWSTR input, INT cChar, INT start, INT next,
  88                             lexical_function lex)
  89 {
  90     if (!is_consonant( lex(input[next]) )) return -1;
  91     next++;
  92     if ((next < cChar) && lex(input[next]) == lex_Nukta)
  93             next++;
  94     if (lex(input[next])==lex_Halant)
  95     {
  96         next++;
  97         if((next < cChar) && is_joiner( lex(input[next]) ))
  98             next++;
  99         if ((next < cChar) && is_consonant( lex(input[next]) ))
 100             return next;
 101     }
 102     else if (is_joiner( lex(input[next]) ) && lex(input[next+1])==lex_Halant)
 103     {
 104         next+=2;
 105         if ((next < cChar) && is_consonant( lex(input[next]) ))
 106             return next;
 107     }
 108     return -1;
 109 }
 110
 111 static INT parse_consonant_syllable(LPCWSTR input, INT cChar, INT start,
 112                                     INT *main, INT next, lexical_function lex)
 113 {
 114     int check;
 115     int headers = 0;
 116     do
 117     {
 118         check = consonant_header(input,cChar,start,next,lex);
 119         if (check != -1)
 120         {
 121             next = check;
 122             headers++;
 123         }
 124     } while (check != -1);
 125     if (headers || is_consonant( lex(input[next]) ))
 126     {
 127         *main = next;
 128         next++;
 129     }
 130     else
 131         return -1;
 132     if ((next < cChar) && lex(input[next]) == lex_Nukta)
 133             next++;
 134     if ((next < cChar) && lex(input[next]) == lex_Anudatta)
 135             next++;
 136
 137     if ((next < cChar) && lex(input[next]) == lex_Halant)
 138     {
 139         next++;
 140         if((next < cChar) && is_joiner( lex(input[next]) ))
 141             next++;
 142     }
 143     else if (next < cChar)
 144     {
 145         while((next < cChar) && is_matra( lex(input[next]) ))
 146             next++;
 147         if ((next < cChar) && lex(input[next]) == lex_Nukta)
 148             next++;
 149         if ((next < cChar) && lex(input[next]) == lex_Halant)
 150             next++;
 151     }
 152     if ((next < cChar) && lex(input[next]) == lex_Modifier)
 153             next++;
 154     if ((next < cChar) && lex(input[next]) == lex_Vedic)
 155             next++;
 156     return next;
 157 }
 158
 159 static INT parse_vowel_syllable(LPCWSTR input, INT cChar, INT start,
 160                                     INT next, lexical_function lex)
 161 {
 162     if ((next < cChar) && lex(input[next]) == lex_Nukta)
 163         next++;
 164     if ((next < cChar) && is_joiner( lex(input[next]) ) && lex(input[next+1])==lex_Halant && is_consonant( lex(input[next+2]) ))
 165         next+=3;
 166     else if ((next < cChar) && lex(input[next])==lex_Halant && is_consonant( lex(input[next+1]) ))
 167         next+=2;
 168     else if ((next < cChar) && lex(input[next])==lex_ZWJ && is_consonant( lex(input[next+1]) ))
 169         next+=2;
 170
 171     if (is_matra( lex(input[next]) ))
 172     {
 173         while((next < cChar) && is_matra( lex(input[next]) ))
 174             next++;
 175         if ((next < cChar) && lex(input[next]) == lex_Nukta)
 176             next++;
 177         if ((next < cChar) && lex(input[next]) == lex_Halant)
 178             next++;
 179     }
 180
 181     if ((next < cChar) && lex(input[next]) == lex_Modifier)
 182         next++;
 183     if ((next < cChar) && lex(input[next]) == lex_Vedic)
 184         next++;
 185     return next;
 186 }
 187
 188 static INT Indic_process_next_syllable( LPCWSTR input, INT cChar, INT start, INT* main, INT next, lexical_function lex )
 189 {
 190     if (lex(input[next])==lex_Vowel)
 191     {
 192         *main = next;
 193         return parse_vowel_syllable(input, cChar, start, next+1, lex);
 194     }
 195     else if ((cChar > next+3) && lex(input[next]) == lex_Ra && lex(input[next+1]) == lex_Halant && lex(input[next+2]) == lex_Vowel)
 196     {
 197         *main = next+2;
 198         return parse_vowel_syllable(input, cChar, start, next+3, lex);
 199     }
 200
 201     else if (start == next && lex(input[next])==lex_NBSP)
 202     {
 203         *main = next;
 204         return parse_vowel_syllable(input, cChar, start, next+1, lex);
 205     }
 206     else if (start == next && (cChar > next+3) && lex(input[next]) == lex_Ra && lex(input[next+1]) == lex_Halant && lex(input[next+2]) == lex_NBSP)
 207     {
 208         *main = next+2;
 209         return parse_vowel_syllable(input, cChar, start, next+3, lex);
 210     }
 211
 212     return parse_consonant_syllable(input, cChar, start, main, next, lex);
 213 }
 214
 215 void Indic_ReorderCharacters( LPWSTR input, int cChar, lexical_function lex, reorder_function reorder_f)
 216 {
 217     int index = 0;
 218     int next = 0;
 219     int center = 0;
 220
 221     if (!lex || ! reorder_f)
 222     {
 223         ERR("Failure to have required functions\n");
 224         return;
 225     }
 226
 227     debug_output_string(input, cChar, lex);
 228     while (next != -1)
 229     {
 230         while((next < cChar) && lex(input[next]) == lex_Generic)
 231             next++;
 232         index = next;
 233         next = Indic_process_next_syllable(input, cChar, 0, &center, index, lex);
 234         if (next != -1)
 235         {
 236             reorder_f(input, index, center, next-1, lex);
 237             index = next;
 238         }
 239         else if (index < cChar)
 240         {
 241             int i;
 242             TRACE("Processing failed at %i\n",index);
 243             for (i = index; i < cChar; i++)
 244                 if (lex(input[i])==lex_Generic)
 245                 {
 246                     TRACE("Restart processing at %i\n",i);
 247                     next = i;
 248                     index = i;
 249                     break;
 250                 }
 251         }
 252     }
 253     TRACE("Processed %i of %i characters\n",index,cChar);
 254 }
 255
 256 int Indic_FindBaseConsonant(LPWSTR input, INT start, INT main, INT end, lexical_function lex)
 257 {
 258     int i;
 259     /* try to find a base consonant */
 260     if (!is_consonant( lex(input[main]) ))
 261     {
 262         for (i = end; i >= start; i--)
 263             if (is_consonant( lex(input[i]) ))
 264             {
 265                 main = i;
 266                 break;
 267             }
 268     }
 269     return main;
 270 }