icuSources/layout/IndicRearrangementProcessor.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "MorphTables.h"
   9 #include "StateTables.h"
  10 #include "MorphStateTables.h"
  11 #include "SubtableProcessor.h"
  12 #include "StateTableProcessor.h"
  13 #include "IndicRearrangementProcessor.h"
  14 #include "LEGlyphStorage.h"
  15 #include "LESwaps.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndicRearrangementProcessor)
  20
  21 IndicRearrangementProcessor::IndicRearrangementProcessor(const MorphSubtableHeader *morphSubtableHeader)
  22   : StateTableProcessor(morphSubtableHeader)
  23 {
  24     indicRearrangementSubtableHeader = (const IndicRearrangementSubtableHeader *) morphSubtableHeader;
  25     entryTable = (const IndicRearrangementStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);
  26 }
  27
  28 IndicRearrangementProcessor::~IndicRearrangementProcessor()
  29 {
  30 }
  31
  32 void IndicRearrangementProcessor::beginStateTable()
  33 {
  34     firstGlyph = 0;
  35     lastGlyph = 0;
  36 }
  37
  38 ByteOffset IndicRearrangementProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
  39 {
  40     const IndicRearrangementStateEntry *entry = &entryTable[index];
  41     ByteOffset newState = SWAPW(entry->newStateOffset);
  42     IndicRearrangementFlags flags = (IndicRearrangementFlags) SWAPW(entry->flags);
  43
  44     if (flags & irfMarkFirst) {
  45         firstGlyph = currGlyph;
  46     }
  47
  48     if (flags & irfMarkLast) {
  49         lastGlyph = currGlyph;
  50     }
  51
  52     doRearrangementAction(glyphStorage, (IndicRearrangementVerb) (flags & irfVerbMask));
  53
  54     if (!(flags & irfDontAdvance)) {
  55         // XXX: Should handle reverse too...
  56         currGlyph += 1;
  57     }
  58
  59     return newState;
  60 }
  61
  62 void IndicRearrangementProcessor::endStateTable()
  63 {
  64 }
  65
  66 void IndicRearrangementProcessor::doRearrangementAction(LEGlyphStorage &glyphStorage, IndicRearrangementVerb verb) const
  67 {
  68     LEGlyphID a, b, c, d;
  69     le_int32 ia, ib, ic, id, ix, x;
  70     LEErrorCode success = LE_NO_ERROR;
  71
  72     switch(verb)
  73     {
  74     case irvNoAction:
  75         break;
  76
  77     case irvxA:
  78         a = glyphStorage[firstGlyph];
  79         ia = glyphStorage.getCharIndex(firstGlyph, success);
  80         x = firstGlyph + 1;
  81
  82         while (x <= lastGlyph) {
  83             glyphStorage[x - 1] = glyphStorage[x];
  84             ix = glyphStorage.getCharIndex(x, success);
  85             glyphStorage.setCharIndex(x - 1, ix, success);
  86             x += 1;
  87         }
  88
  89         glyphStorage[lastGlyph] = a;
  90         glyphStorage.setCharIndex(lastGlyph, ia, success);
  91         break;
  92
  93     case irvDx:
  94         d = glyphStorage[lastGlyph];
  95         id = glyphStorage.getCharIndex(lastGlyph, success);
  96         x = lastGlyph - 1;
  97
  98         while (x >= firstGlyph) {
  99             glyphStorage[x + 1] = glyphStorage[x];
 100             ix = glyphStorage.getCharIndex(x, success);
 101             glyphStorage.setCharIndex(x + 1, ix, success);
 102             x -= 1;
 103         }
 104
 105         glyphStorage[firstGlyph] = d;
 106         glyphStorage.setCharIndex(firstGlyph, id, success);
 107         break;
 108
 109     case irvDxA:
 110         a = glyphStorage[firstGlyph];
 111         ia = glyphStorage.getCharIndex(firstGlyph, success);
 112         id = glyphStorage.getCharIndex(lastGlyph,  success);
 113
 114         glyphStorage[firstGlyph] = glyphStorage[lastGlyph];
 115         glyphStorage[lastGlyph] = a;
 116
 117         glyphStorage.setCharIndex(firstGlyph, id, success);
 118         glyphStorage.setCharIndex(lastGlyph,  ia, success);
 119         break;
 120
 121     case irvxAB:
 122         a = glyphStorage[firstGlyph];
 123         b = glyphStorage[firstGlyph + 1];
 124         ia = glyphStorage.getCharIndex(firstGlyph, success);
 125         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 126         x = firstGlyph + 2;
 127
 128         while (x <= lastGlyph) {
 129             glyphStorage[x - 2] = glyphStorage[x];
 130             ix = glyphStorage.getCharIndex(x, success);
 131             glyphStorage.setCharIndex(x - 2, ix, success);
 132             x += 1;
 133         }
 134
 135         glyphStorage[lastGlyph - 1] = a;
 136         glyphStorage[lastGlyph] = b;
 137
 138         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 139         glyphStorage.setCharIndex(lastGlyph, ib, success);
 140         break;
 141
 142     case irvxBA:
 143         a = glyphStorage[firstGlyph];
 144         b = glyphStorage[firstGlyph + 1];
 145         ia = glyphStorage.getCharIndex(firstGlyph, success);
 146         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 147         x = firstGlyph + 2;
 148
 149         while (x <= lastGlyph) {
 150             glyphStorage[x - 2] = glyphStorage[x];
 151             ix = glyphStorage.getCharIndex(x, success);
 152             glyphStorage.setCharIndex(x - 2, ix, success);
 153             x += 1;
 154         }
 155
 156         glyphStorage[lastGlyph - 1] = b;
 157         glyphStorage[lastGlyph] = a;
 158
 159         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 160         glyphStorage.setCharIndex(lastGlyph, ia, success);
 161         break;
 162
 163     case irvCDx:
 164         c = glyphStorage[lastGlyph - 1];
 165         d = glyphStorage[lastGlyph];
 166         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 167         id = glyphStorage.getCharIndex(lastGlyph, success);
 168         x = lastGlyph - 2;
 169
 170         while (x >= firstGlyph) {
 171             glyphStorage[x + 2] = glyphStorage[x];
 172             ix = glyphStorage.getCharIndex(x, success);
 173             glyphStorage.setCharIndex(x + 2, ix, success);
 174             x -= 1;
 175         }
 176
 177         glyphStorage[firstGlyph] = c;
 178         glyphStorage[firstGlyph + 1] = d;
 179
 180         glyphStorage.setCharIndex(firstGlyph, ic, success);
 181         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 182         break;
 183
 184     case irvDCx:
 185         c = glyphStorage[lastGlyph - 1];
 186         d = glyphStorage[lastGlyph];
 187         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 188         id = glyphStorage.getCharIndex(lastGlyph, success);
 189         x = lastGlyph - 2;
 190
 191         while (x >= firstGlyph) {
 192             glyphStorage[x + 2] = glyphStorage[x];
 193             ix = glyphStorage.getCharIndex(x, success);
 194             glyphStorage.setCharIndex(x + 2, ix, success);
 195             x -= 1;
 196         }
 197
 198         glyphStorage[firstGlyph] = d;
 199         glyphStorage[firstGlyph + 1] = c;
 200
 201         glyphStorage.setCharIndex(firstGlyph, id, success);
 202         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 203         break;
 204
 205     case irvCDxA:
 206         a = glyphStorage[firstGlyph];
 207         c = glyphStorage[lastGlyph - 1];
 208         d = glyphStorage[lastGlyph];
 209         ia = glyphStorage.getCharIndex(firstGlyph, success);
 210         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 211         id = glyphStorage.getCharIndex(lastGlyph, success);
 212         x = lastGlyph - 2;
 213
 214         while (x > firstGlyph) {
 215             glyphStorage[x + 1] = glyphStorage[x];
 216             ix = glyphStorage.getCharIndex(x, success);
 217             glyphStorage.setCharIndex(x + 1, ix, success);
 218             x -= 1;
 219         }
 220
 221         glyphStorage[firstGlyph] = c;
 222         glyphStorage[firstGlyph + 1] = d;
 223         glyphStorage[lastGlyph] = a;
 224
 225         glyphStorage.setCharIndex(firstGlyph, ic, success);
 226         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 227         glyphStorage.setCharIndex(lastGlyph, ia, success);
 228         break;
 229
 230     case irvDCxA:
 231         a = glyphStorage[firstGlyph];
 232         c = glyphStorage[lastGlyph - 1];
 233         d = glyphStorage[lastGlyph];
 234         ia = glyphStorage.getCharIndex(firstGlyph, success);
 235         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 236         id = glyphStorage.getCharIndex(lastGlyph, success);
 237         x = lastGlyph - 2;
 238
 239         while (x > firstGlyph) {
 240             glyphStorage[x + 1] = glyphStorage[x];
 241             ix = glyphStorage.getCharIndex(x, success);
 242             glyphStorage.setCharIndex(x + 1, ix, success);
 243             x -= 1;
 244         }
 245
 246         glyphStorage[firstGlyph] = d;
 247         glyphStorage[firstGlyph + 1] = c;
 248         glyphStorage[lastGlyph] = a;
 249
 250         glyphStorage.setCharIndex(firstGlyph, id, success);
 251         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 252         glyphStorage.setCharIndex(lastGlyph, ia, success);
 253         break;
 254
 255     case irvDxAB:
 256         a = glyphStorage[firstGlyph];
 257         b = glyphStorage[firstGlyph + 1];
 258         d = glyphStorage[lastGlyph];
 259         ia = glyphStorage.getCharIndex(firstGlyph, success);
 260         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 261         id = glyphStorage.getCharIndex(lastGlyph, success);
 262         x = firstGlyph + 2;
 263
 264         while (x < lastGlyph) {
 265             glyphStorage[x - 2] = glyphStorage[x];
 266             ix = glyphStorage.getCharIndex(x, success);
 267             glyphStorage.setCharIndex(x - 2, ix, success);
 268             x += 1;
 269         }
 270
 271         glyphStorage[firstGlyph] = d;
 272         glyphStorage[lastGlyph - 1] = a;
 273         glyphStorage[lastGlyph] = b;
 274
 275         glyphStorage.setCharIndex(firstGlyph, id, success);
 276         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 277         glyphStorage.setCharIndex(lastGlyph, ib, success);
 278         break;
 279
 280     case irvDxBA:
 281         a = glyphStorage[firstGlyph];
 282         b = glyphStorage[firstGlyph + 1];
 283         d = glyphStorage[lastGlyph];
 284         ia = glyphStorage.getCharIndex(firstGlyph, success);
 285         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 286         id = glyphStorage.getCharIndex(lastGlyph, success);
 287         x = firstGlyph + 2;
 288
 289         while (x < lastGlyph) {
 290             glyphStorage[x - 2] = glyphStorage[x];
 291             ix = glyphStorage.getCharIndex(x, success);
 292             glyphStorage.setCharIndex(x - 2, ix, success);
 293             x += 1;
 294         }
 295
 296         glyphStorage[firstGlyph] = d;
 297         glyphStorage[lastGlyph - 1] = b;
 298         glyphStorage[lastGlyph] = a;
 299
 300         glyphStorage.setCharIndex(firstGlyph, id, success);
 301         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 302         glyphStorage.setCharIndex(lastGlyph, ia, success);
 303         break;
 304
 305     case irvCDxAB:
 306         a = glyphStorage[firstGlyph];
 307         b = glyphStorage[firstGlyph + 1];
 308
 309         glyphStorage[firstGlyph] = glyphStorage[lastGlyph - 1];
 310         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph];
 311
 312         glyphStorage[lastGlyph - 1] = a;
 313         glyphStorage[lastGlyph] = b;
 314
 315         ia = glyphStorage.getCharIndex(firstGlyph, success);
 316         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 317         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 318         id = glyphStorage.getCharIndex(lastGlyph, success);
 319
 320         glyphStorage.setCharIndex(firstGlyph, ic, success);
 321         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 322
 323         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 324         glyphStorage.setCharIndex(lastGlyph, ib, success);
 325         break;
 326
 327     case irvCDxBA:
 328         a = glyphStorage[firstGlyph];
 329         b = glyphStorage[firstGlyph + 1];
 330
 331         glyphStorage[firstGlyph] = glyphStorage[lastGlyph - 1];
 332         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph];
 333
 334         glyphStorage[lastGlyph - 1] = b;
 335         glyphStorage[lastGlyph] = a;
 336
 337         ia = glyphStorage.getCharIndex(firstGlyph, success);
 338         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 339         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 340         id = glyphStorage.getCharIndex(lastGlyph, success);
 341
 342         glyphStorage.setCharIndex(firstGlyph, ic, success);
 343         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 344
 345         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 346         glyphStorage.setCharIndex(lastGlyph, ia, success);
 347         break;
 348
 349     case irvDCxAB:
 350         a = glyphStorage[firstGlyph];
 351         b = glyphStorage[firstGlyph + 1];
 352
 353         glyphStorage[firstGlyph] = glyphStorage[lastGlyph];
 354         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph - 1];
 355
 356         glyphStorage[lastGlyph - 1] = a;
 357         glyphStorage[lastGlyph] = b;
 358
 359         ia = glyphStorage.getCharIndex(firstGlyph, success);
 360         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 361         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 362         id = glyphStorage.getCharIndex(lastGlyph, success);
 363
 364         glyphStorage.setCharIndex(firstGlyph, id, success);
 365         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 366
 367         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 368         glyphStorage.setCharIndex(lastGlyph, ib, success);
 369         break;
 370
 371     case irvDCxBA:
 372         a = glyphStorage[firstGlyph];
 373         b = glyphStorage[firstGlyph + 1];
 374
 375         glyphStorage[firstGlyph] = glyphStorage[lastGlyph];
 376         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph - 1];
 377
 378         glyphStorage[lastGlyph - 1] = b;
 379         glyphStorage[lastGlyph] = a;
 380
 381         ia = glyphStorage.getCharIndex(firstGlyph, success);
 382         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 383         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 384         id = glyphStorage.getCharIndex(lastGlyph, success);
 385
 386         glyphStorage.setCharIndex(firstGlyph, id, success);
 387         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 388
 389         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 390         glyphStorage.setCharIndex(lastGlyph, ia, success);
 391         break;
 392
 393     default:
 394         break;
 395     }
 396 }
 397
 398 U_NAMESPACE_END