icuSources/layout/IndicRearrangementProcessor.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2015 - 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 LEReferenceTo<MorphSubtableHeader> &morphSubtableHeader, LEErrorCode &success)
  22   : StateTableProcessor(morphSubtableHeader, success),
  23   indicRearrangementSubtableHeader(morphSubtableHeader, success),
  24   entryTable(stateTableHeader, success, (const IndicRearrangementStateEntry*)(&stateTableHeader->stHeader),
  25              entryTableOffset, LE_UNBOUNDED_ARRAY),
  26   int16Table(stateTableHeader, success, (const le_int16*)entryTable.getAlias(), 0, LE_UNBOUNDED_ARRAY)
  27
  28 {
  29 }
  30
  31 IndicRearrangementProcessor::~IndicRearrangementProcessor()
  32 {
  33 }
  34
  35 void IndicRearrangementProcessor::beginStateTable()
  36 {
  37     firstGlyph = 0;
  38     lastGlyph = 0;
  39 }
  40
  41 ByteOffset IndicRearrangementProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)
  42 {
  43   LEErrorCode success = LE_NO_ERROR; // todo- make a param?
  44   const IndicRearrangementStateEntry *entry = entryTable.getAlias(index,success);
  45     ByteOffset newState = SWAPW(entry->newStateOffset);
  46     IndicRearrangementFlags flags = (IndicRearrangementFlags) SWAPW(entry->flags);
  47
  48     if (flags & irfMarkFirst) {
  49         firstGlyph = (le_uint32)currGlyph;
  50     }
  51
  52     if (flags & irfMarkLast) {
  53         lastGlyph = (le_uint32)currGlyph;
  54     }
  55
  56     doRearrangementAction(glyphStorage, (IndicRearrangementVerb) (flags & irfVerbMask), success);
  57
  58     if (!(flags & irfDontAdvance)) {
  59         // XXX: Should handle reverse too...
  60         currGlyph += 1;
  61     }
  62
  63     return newState;
  64 }
  65
  66 void IndicRearrangementProcessor::endStateTable()
  67 {
  68 }
  69
  70 void IndicRearrangementProcessor::doRearrangementAction(LEGlyphStorage &glyphStorage, IndicRearrangementVerb verb, LEErrorCode &success) const
  71 {
  72     LEGlyphID a, b, c, d;
  73     le_int32 ia, ib, ic, id, ix, x;
  74
  75     if (LE_FAILURE(success)) return;
  76
  77     if (verb == irvNoAction) {
  78         return;
  79     }
  80     if (firstGlyph > lastGlyph) {
  81         success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
  82         return;
  83     }
  84
  85     switch(verb)
  86     {
  87     case irvxA:
  88         if (firstGlyph == lastGlyph) break;
  89         if (firstGlyph + 1 < firstGlyph) {
  90             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
  91         break;
  92         }
  93         a = glyphStorage[firstGlyph];
  94         ia = glyphStorage.getCharIndex(firstGlyph, success);
  95         x = firstGlyph + 1;
  96
  97         while (x <= lastGlyph) {
  98             glyphStorage[x - 1] = glyphStorage[x];
  99             ix = glyphStorage.getCharIndex(x, success);
 100             glyphStorage.setCharIndex(x - 1, ix, success);
 101             x += 1;
 102         }
 103
 104         glyphStorage[lastGlyph] = a;
 105         glyphStorage.setCharIndex(lastGlyph, ia, success);
 106         break;
 107
 108     case irvDx:
 109         if (firstGlyph == lastGlyph) break;
 110         if (lastGlyph - 1 > lastGlyph) {
 111             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 112             break;
 113         }
 114         d = glyphStorage[lastGlyph];
 115         id = glyphStorage.getCharIndex(lastGlyph, success);
 116         x = lastGlyph - 1;
 117
 118         while (x >= firstGlyph) {
 119             glyphStorage[x + 1] = glyphStorage[x];
 120             ix = glyphStorage.getCharIndex(x, success);
 121             glyphStorage.setCharIndex(x + 1, ix, success);
 122             x -= 1;
 123         }
 124
 125         glyphStorage[firstGlyph] = d;
 126         glyphStorage.setCharIndex(firstGlyph, id, success);
 127         break;
 128
 129     case irvDxA:
 130         a = glyphStorage[firstGlyph];
 131         ia = glyphStorage.getCharIndex(firstGlyph, success);
 132         id = glyphStorage.getCharIndex(lastGlyph,  success);
 133
 134         glyphStorage[firstGlyph] = glyphStorage[lastGlyph];
 135         glyphStorage[lastGlyph] = a;
 136
 137         glyphStorage.setCharIndex(firstGlyph, id, success);
 138         glyphStorage.setCharIndex(lastGlyph,  ia, success);
 139         break;
 140
 141     case irvxAB:
 142         if ((firstGlyph + 2 < firstGlyph) ||
 143             (lastGlyph - firstGlyph < 1)) { // difference == 1 is a no-op, < 1 is an error.
 144             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 145             break;
 146         }
 147         a = glyphStorage[firstGlyph];
 148         b = glyphStorage[firstGlyph + 1];
 149         ia = glyphStorage.getCharIndex(firstGlyph, success);
 150         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 151         x = firstGlyph + 2;
 152
 153         while (x <= lastGlyph) {
 154             glyphStorage[x - 2] = glyphStorage[x];
 155             ix = glyphStorage.getCharIndex(x, success);
 156             glyphStorage.setCharIndex(x - 2, ix, success);
 157             x += 1;
 158         }
 159
 160         glyphStorage[lastGlyph - 1] = a;
 161         glyphStorage[lastGlyph] = b;
 162
 163         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 164         glyphStorage.setCharIndex(lastGlyph, ib, success);
 165         break;
 166
 167     case irvxBA:
 168         if ((firstGlyph + 2 < firstGlyph) ||
 169             (lastGlyph - firstGlyph < 1)) {
 170             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 171             break;
 172         }
 173         a = glyphStorage[firstGlyph];
 174         b = glyphStorage[firstGlyph + 1];
 175         ia = glyphStorage.getCharIndex(firstGlyph, success);
 176         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 177         x = firstGlyph + 2;
 178
 179         while (x <= lastGlyph) {
 180             glyphStorage[x - 2] = glyphStorage[x];
 181             ix = glyphStorage.getCharIndex(x, success);
 182             glyphStorage.setCharIndex(x - 2, ix, success);
 183             x += 1;
 184         }
 185
 186         glyphStorage[lastGlyph - 1] = b;
 187         glyphStorage[lastGlyph] = a;
 188
 189         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 190         glyphStorage.setCharIndex(lastGlyph, ia, success);
 191         break;
 192
 193     case irvCDx:
 194         if ((lastGlyph - 2 > lastGlyph) ||
 195             (lastGlyph - firstGlyph < 1)) {
 196             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 197             break;
 198         }
 199         c = glyphStorage[lastGlyph - 1];
 200         d = glyphStorage[lastGlyph];
 201         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 202         id = glyphStorage.getCharIndex(lastGlyph, success);
 203         x = lastGlyph - 2;
 204
 205         while (x >= firstGlyph) {
 206             glyphStorage[x + 2] = glyphStorage[x];
 207             ix = glyphStorage.getCharIndex(x, success);
 208             glyphStorage.setCharIndex(x + 2, ix, success);
 209             x -= 1;
 210         }
 211
 212         glyphStorage[firstGlyph] = c;
 213         glyphStorage[firstGlyph + 1] = d;
 214
 215         glyphStorage.setCharIndex(firstGlyph, ic, success);
 216         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 217         break;
 218
 219     case irvDCx:
 220         if ((lastGlyph - 2 > lastGlyph) ||
 221             (lastGlyph - firstGlyph < 1)) {
 222             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 223             break;
 224         }
 225         c = glyphStorage[lastGlyph - 1];
 226         d = glyphStorage[lastGlyph];
 227         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 228         id = glyphStorage.getCharIndex(lastGlyph, success);
 229         x = lastGlyph - 2;
 230
 231         while (x >= firstGlyph) {
 232             glyphStorage[x + 2] = glyphStorage[x];
 233             ix = glyphStorage.getCharIndex(x, success);
 234             glyphStorage.setCharIndex(x + 2, ix, success);
 235             x -= 1;
 236         }
 237
 238         glyphStorage[firstGlyph] = d;
 239         glyphStorage[firstGlyph + 1] = c;
 240
 241         glyphStorage.setCharIndex(firstGlyph, id, success);
 242         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 243         break;
 244
 245     case irvCDxA:
 246         if ((lastGlyph - 2 > lastGlyph) ||
 247             (lastGlyph - firstGlyph < 2)) {
 248             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 249             break;
 250         }
 251         a = glyphStorage[firstGlyph];
 252         c = glyphStorage[lastGlyph - 1];
 253         d = glyphStorage[lastGlyph];
 254         ia = glyphStorage.getCharIndex(firstGlyph, success);
 255         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 256         id = glyphStorage.getCharIndex(lastGlyph, success);
 257         x = lastGlyph - 2;
 258
 259         while (x > firstGlyph) {
 260             glyphStorage[x + 1] = glyphStorage[x];
 261             ix = glyphStorage.getCharIndex(x, success);
 262             glyphStorage.setCharIndex(x + 1, ix, success);
 263             x -= 1;
 264         }
 265
 266         glyphStorage[firstGlyph] = c;
 267         glyphStorage[firstGlyph + 1] = d;
 268         glyphStorage[lastGlyph] = a;
 269
 270         glyphStorage.setCharIndex(firstGlyph, ic, success);
 271         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 272         glyphStorage.setCharIndex(lastGlyph, ia, success);
 273         break;
 274
 275     case irvDCxA:
 276         if ((lastGlyph - 2 > lastGlyph) ||
 277             (lastGlyph - firstGlyph < 2)) {
 278             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 279             break;
 280         }
 281         a = glyphStorage[firstGlyph];
 282         c = glyphStorage[lastGlyph - 1];
 283         d = glyphStorage[lastGlyph];
 284         ia = glyphStorage.getCharIndex(firstGlyph, success);
 285         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 286         id = glyphStorage.getCharIndex(lastGlyph, success);
 287         x = lastGlyph - 2;
 288
 289         while (x > firstGlyph) {
 290             glyphStorage[x + 1] = glyphStorage[x];
 291             ix = glyphStorage.getCharIndex(x, success);
 292             glyphStorage.setCharIndex(x + 1, ix, success);
 293             x -= 1;
 294         }
 295
 296         glyphStorage[firstGlyph] = d;
 297         glyphStorage[firstGlyph + 1] = c;
 298         glyphStorage[lastGlyph] = a;
 299
 300         glyphStorage.setCharIndex(firstGlyph, id, success);
 301         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 302         glyphStorage.setCharIndex(lastGlyph, ia, success);
 303         break;
 304
 305     case irvDxAB:
 306         if ((firstGlyph + 2 < firstGlyph) ||
 307             (lastGlyph - firstGlyph < 2)) {
 308             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 309             break;
 310         }
 311         a = glyphStorage[firstGlyph];
 312         b = glyphStorage[firstGlyph + 1];
 313         d = glyphStorage[lastGlyph];
 314         ia = glyphStorage.getCharIndex(firstGlyph, success);
 315         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 316         id = glyphStorage.getCharIndex(lastGlyph, success);
 317         x = firstGlyph + 2;
 318
 319         while (x < lastGlyph) {
 320             glyphStorage[x - 2] = glyphStorage[x];
 321             ix = glyphStorage.getCharIndex(x, success);
 322             glyphStorage.setCharIndex(x - 2, ix, success);
 323             x += 1;
 324         }
 325
 326         glyphStorage[firstGlyph] = d;
 327         glyphStorage[lastGlyph - 1] = a;
 328         glyphStorage[lastGlyph] = b;
 329
 330         glyphStorage.setCharIndex(firstGlyph, id, success);
 331         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 332         glyphStorage.setCharIndex(lastGlyph, ib, success);
 333         break;
 334
 335     case irvDxBA:
 336         if ((firstGlyph + 2 < firstGlyph) ||
 337             (lastGlyph - firstGlyph < 2)) {
 338             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 339             break;
 340         }
 341         a = glyphStorage[firstGlyph];
 342         b = glyphStorage[firstGlyph + 1];
 343         d = glyphStorage[lastGlyph];
 344         ia = glyphStorage.getCharIndex(firstGlyph, success);
 345         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 346         id = glyphStorage.getCharIndex(lastGlyph, success);
 347         x = firstGlyph + 2;
 348
 349         while (x < lastGlyph) {
 350             glyphStorage[x - 2] = glyphStorage[x];
 351             ix = glyphStorage.getCharIndex(x, success);
 352             glyphStorage.setCharIndex(x - 2, ix, success);
 353             x += 1;
 354         }
 355
 356         glyphStorage[firstGlyph] = d;
 357         glyphStorage[lastGlyph - 1] = b;
 358         glyphStorage[lastGlyph] = a;
 359
 360         glyphStorage.setCharIndex(firstGlyph, id, success);
 361         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 362         glyphStorage.setCharIndex(lastGlyph, ia, success);
 363         break;
 364
 365     case irvCDxAB:
 366         if (lastGlyph - firstGlyph < 3) {
 367             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 368             break;
 369         }
 370         a = glyphStorage[firstGlyph];
 371         b = glyphStorage[firstGlyph + 1];
 372
 373         glyphStorage[firstGlyph] = glyphStorage[lastGlyph - 1];
 374         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph];
 375
 376         glyphStorage[lastGlyph - 1] = a;
 377         glyphStorage[lastGlyph] = b;
 378
 379         ia = glyphStorage.getCharIndex(firstGlyph, success);
 380         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 381         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 382         id = glyphStorage.getCharIndex(lastGlyph, success);
 383
 384         glyphStorage.setCharIndex(firstGlyph, ic, success);
 385         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 386
 387         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 388         glyphStorage.setCharIndex(lastGlyph, ib, success);
 389         break;
 390
 391     case irvCDxBA:
 392         if (lastGlyph - firstGlyph < 3) {
 393             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 394             break;
 395         }
 396         a = glyphStorage[firstGlyph];
 397         b = glyphStorage[firstGlyph + 1];
 398
 399         glyphStorage[firstGlyph] = glyphStorage[lastGlyph - 1];
 400         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph];
 401
 402         glyphStorage[lastGlyph - 1] = b;
 403         glyphStorage[lastGlyph] = a;
 404
 405         ia = glyphStorage.getCharIndex(firstGlyph, success);
 406         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 407         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 408         id = glyphStorage.getCharIndex(lastGlyph, success);
 409
 410         glyphStorage.setCharIndex(firstGlyph, ic, success);
 411         glyphStorage.setCharIndex(firstGlyph + 1, id, success);
 412
 413         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 414         glyphStorage.setCharIndex(lastGlyph, ia, success);
 415         break;
 416
 417     case irvDCxAB:
 418         if (lastGlyph - firstGlyph < 3) {
 419             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 420             break;
 421         }
 422         a = glyphStorage[firstGlyph];
 423         b = glyphStorage[firstGlyph + 1];
 424
 425         glyphStorage[firstGlyph] = glyphStorage[lastGlyph];
 426         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph - 1];
 427
 428         glyphStorage[lastGlyph - 1] = a;
 429         glyphStorage[lastGlyph] = b;
 430
 431         ia = glyphStorage.getCharIndex(firstGlyph, success);
 432         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 433         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 434         id = glyphStorage.getCharIndex(lastGlyph, success);
 435
 436         glyphStorage.setCharIndex(firstGlyph, id, success);
 437         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 438
 439         glyphStorage.setCharIndex(lastGlyph - 1, ia, success);
 440         glyphStorage.setCharIndex(lastGlyph, ib, success);
 441         break;
 442
 443     case irvDCxBA:
 444         if (lastGlyph - firstGlyph < 3) {
 445             success = LE_INDEX_OUT_OF_BOUNDS_ERROR;
 446             break;
 447         }
 448         a = glyphStorage[firstGlyph];
 449         b = glyphStorage[firstGlyph + 1];
 450
 451         glyphStorage[firstGlyph] = glyphStorage[lastGlyph];
 452         glyphStorage[firstGlyph + 1] = glyphStorage[lastGlyph - 1];
 453
 454         glyphStorage[lastGlyph - 1] = b;
 455         glyphStorage[lastGlyph] = a;
 456
 457         ia = glyphStorage.getCharIndex(firstGlyph, success);
 458         ib = glyphStorage.getCharIndex(firstGlyph + 1, success);
 459         ic = glyphStorage.getCharIndex(lastGlyph - 1, success);
 460         id = glyphStorage.getCharIndex(lastGlyph, success);
 461
 462         glyphStorage.setCharIndex(firstGlyph, id, success);
 463         glyphStorage.setCharIndex(firstGlyph + 1, ic, success);
 464
 465         glyphStorage.setCharIndex(lastGlyph - 1, ib, success);
 466         glyphStorage.setCharIndex(lastGlyph, ia, success);
 467         break;
 468
 469     default:
 470         break;
 471     }
 472 }
 473
 474 U_NAMESPACE_END