SpellChecker.java revision 41347e9e8bff93f42ac11a88875ce67e64e5c88c
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.widget; 18 19import android.content.Context; 20import android.text.Editable; 21import android.text.Selection; 22import android.text.SpannableStringBuilder; 23import android.text.Spanned; 24import android.text.TextUtils; 25import android.text.method.WordIterator; 26import android.text.style.SpellCheckSpan; 27import android.text.style.SuggestionSpan; 28import android.util.Log; 29import android.util.LruCache; 30import android.view.textservice.SentenceSuggestionsInfo; 31import android.view.textservice.SpellCheckerSession; 32import android.view.textservice.SpellCheckerSession.SpellCheckerSessionListener; 33import android.view.textservice.SuggestionsInfo; 34import android.view.textservice.TextInfo; 35import android.view.textservice.TextServicesManager; 36 37import com.android.internal.util.ArrayUtils; 38 39import java.text.BreakIterator; 40import java.util.Locale; 41 42 43/** 44 * Helper class for TextView. Bridge between the TextView and the Dictionnary service. 45 * 46 * @hide 47 */ 48public class SpellChecker implements SpellCheckerSessionListener { 49 private static final String TAG = SpellChecker.class.getSimpleName(); 50 private static final boolean DBG = false; 51 52 // No more than this number of words will be parsed on each iteration to ensure a minimum 53 // lock of the UI thread 54 public static final int MAX_NUMBER_OF_WORDS = 50; 55 56 // Rough estimate, such that the word iterator interval usually does not need to be shifted 57 public static final int AVERAGE_WORD_LENGTH = 7; 58 59 // When parsing, use a character window of that size. Will be shifted if needed 60 public static final int WORD_ITERATOR_INTERVAL = AVERAGE_WORD_LENGTH * MAX_NUMBER_OF_WORDS; 61 62 // Pause between each spell check to keep the UI smooth 63 private final static int SPELL_PAUSE_DURATION = 400; // milliseconds 64 65 private static final int MIN_SENTENCE_LENGTH = 50; 66 67 private static final int USE_SPAN_RANGE = -1; 68 69 private final TextView mTextView; 70 71 SpellCheckerSession mSpellCheckerSession; 72 // We assume that the sentence level spell check will always provide better results than words. 73 // Although word SC has a sequential option. 74 private boolean mIsSentenceSpellCheckSupported; 75 final int mCookie; 76 77 // Paired arrays for the (id, spellCheckSpan) pair. A negative id means the associated 78 // SpellCheckSpan has been recycled and can be-reused. 79 // Contains null SpellCheckSpans after index mLength. 80 private int[] mIds; 81 private SpellCheckSpan[] mSpellCheckSpans; 82 // The mLength first elements of the above arrays have been initialized 83 private int mLength; 84 85 // Parsers on chunck of text, cutting text into words that will be checked 86 private SpellParser[] mSpellParsers = new SpellParser[0]; 87 88 private int mSpanSequenceCounter = 0; 89 90 private Locale mCurrentLocale; 91 92 // Shared by all SpellParsers. Cannot be shared with TextView since it may be used 93 // concurrently due to the asynchronous nature of onGetSuggestions. 94 private WordIterator mWordIterator; 95 96 private TextServicesManager mTextServicesManager; 97 98 private Runnable mSpellRunnable; 99 100 private static final int SUGGESTION_SPAN_CACHE_SIZE = 10; 101 private final LruCache<Long, SuggestionSpan> mSuggestionSpanCache = 102 new LruCache<Long, SuggestionSpan>(SUGGESTION_SPAN_CACHE_SIZE); 103 104 public SpellChecker(TextView textView) { 105 mTextView = textView; 106 107 // Arbitrary: these arrays will automatically double their sizes on demand 108 final int size = ArrayUtils.idealObjectArraySize(1); 109 mIds = new int[size]; 110 mSpellCheckSpans = new SpellCheckSpan[size]; 111 112 setLocale(mTextView.getTextServicesLocale()); 113 114 mCookie = hashCode(); 115 } 116 117 private void resetSession() { 118 closeSession(); 119 120 mTextServicesManager = (TextServicesManager) mTextView.getContext(). 121 getSystemService(Context.TEXT_SERVICES_MANAGER_SERVICE); 122 if (!mTextServicesManager.isSpellCheckerEnabled() 123 || mTextServicesManager.getCurrentSpellCheckerSubtype(true) == null) { 124 mSpellCheckerSession = null; 125 } else { 126 mSpellCheckerSession = mTextServicesManager.newSpellCheckerSession( 127 null /* Bundle not currently used by the textServicesManager */, 128 mCurrentLocale, this, 129 false /* means any available languages from current spell checker */); 130 mIsSentenceSpellCheckSupported = true; 131 } 132 133 // Restore SpellCheckSpans in pool 134 for (int i = 0; i < mLength; i++) { 135 // Resets id and progress to invalidate spell check span 136 mSpellCheckSpans[i].setSpellCheckInProgress(false); 137 mIds[i] = -1; 138 } 139 mLength = 0; 140 141 // Remove existing misspelled SuggestionSpans 142 mTextView.removeMisspelledSpans((Editable) mTextView.getText()); 143 mSuggestionSpanCache.evictAll(); 144 } 145 146 private void setLocale(Locale locale) { 147 mCurrentLocale = locale; 148 149 resetSession(); 150 151 // Change SpellParsers' wordIterator locale 152 mWordIterator = new WordIterator(locale); 153 154 // This class is the listener for locale change: warn other locale-aware objects 155 mTextView.onLocaleChanged(); 156 } 157 158 /** 159 * @return true if a spell checker session has successfully been created. Returns false if not, 160 * for instance when spell checking has been disabled in settings. 161 */ 162 private boolean isSessionActive() { 163 return mSpellCheckerSession != null; 164 } 165 166 public void closeSession() { 167 if (mSpellCheckerSession != null) { 168 mSpellCheckerSession.close(); 169 } 170 171 final int length = mSpellParsers.length; 172 for (int i = 0; i < length; i++) { 173 mSpellParsers[i].stop(); 174 } 175 176 if (mSpellRunnable != null) { 177 mTextView.removeCallbacks(mSpellRunnable); 178 } 179 } 180 181 private int nextSpellCheckSpanIndex() { 182 for (int i = 0; i < mLength; i++) { 183 if (mIds[i] < 0) return i; 184 } 185 186 if (mLength == mSpellCheckSpans.length) { 187 final int newSize = mLength * 2; 188 int[] newIds = new int[newSize]; 189 SpellCheckSpan[] newSpellCheckSpans = new SpellCheckSpan[newSize]; 190 System.arraycopy(mIds, 0, newIds, 0, mLength); 191 System.arraycopy(mSpellCheckSpans, 0, newSpellCheckSpans, 0, mLength); 192 mIds = newIds; 193 mSpellCheckSpans = newSpellCheckSpans; 194 } 195 196 mSpellCheckSpans[mLength] = new SpellCheckSpan(); 197 mLength++; 198 return mLength - 1; 199 } 200 201 private void addSpellCheckSpan(Editable editable, int start, int end) { 202 final int index = nextSpellCheckSpanIndex(); 203 editable.setSpan(mSpellCheckSpans[index], start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); 204 mIds[index] = mSpanSequenceCounter++; 205 } 206 207 public void removeSpellCheckSpan(SpellCheckSpan spellCheckSpan) { 208 for (int i = 0; i < mLength; i++) { 209 if (mSpellCheckSpans[i] == spellCheckSpan) { 210 // Resets id and progress to invalidate spell check span 211 mSpellCheckSpans[i].setSpellCheckInProgress(false); 212 mIds[i] = -1; 213 return; 214 } 215 } 216 } 217 218 public void onSelectionChanged() { 219 spellCheck(); 220 } 221 222 public void spellCheck(int start, int end) { 223 if (DBG) { 224 Log.d(TAG, "Start spell-checking: " + start + ", " + end); 225 } 226 final Locale locale = mTextView.getTextServicesLocale(); 227 final boolean isSessionActive = isSessionActive(); 228 if (mCurrentLocale == null || (!(mCurrentLocale.equals(locale)))) { 229 setLocale(locale); 230 // Re-check the entire text 231 start = 0; 232 end = mTextView.getText().length(); 233 } else { 234 final boolean spellCheckerActivated = mTextServicesManager.isSpellCheckerEnabled(); 235 if (isSessionActive != spellCheckerActivated) { 236 // Spell checker has been turned of or off since last spellCheck 237 resetSession(); 238 } 239 } 240 241 if (!isSessionActive) return; 242 243 // Find first available SpellParser from pool 244 final int length = mSpellParsers.length; 245 for (int i = 0; i < length; i++) { 246 final SpellParser spellParser = mSpellParsers[i]; 247 if (spellParser.isFinished()) { 248 spellParser.parse(start, end); 249 return; 250 } 251 } 252 253 if (DBG) { 254 Log.d(TAG, "new spell parser."); 255 } 256 // No available parser found in pool, create a new one 257 SpellParser[] newSpellParsers = new SpellParser[length + 1]; 258 System.arraycopy(mSpellParsers, 0, newSpellParsers, 0, length); 259 mSpellParsers = newSpellParsers; 260 261 SpellParser spellParser = new SpellParser(); 262 mSpellParsers[length] = spellParser; 263 spellParser.parse(start, end); 264 } 265 266 private void spellCheck() { 267 if (mSpellCheckerSession == null) return; 268 269 Editable editable = (Editable) mTextView.getText(); 270 final int selectionStart = Selection.getSelectionStart(editable); 271 final int selectionEnd = Selection.getSelectionEnd(editable); 272 273 TextInfo[] textInfos = new TextInfo[mLength]; 274 int textInfosCount = 0; 275 276 for (int i = 0; i < mLength; i++) { 277 final SpellCheckSpan spellCheckSpan = mSpellCheckSpans[i]; 278 if (mIds[i] < 0 || spellCheckSpan.isSpellCheckInProgress()) continue; 279 280 final int start = editable.getSpanStart(spellCheckSpan); 281 final int end = editable.getSpanEnd(spellCheckSpan); 282 283 // Do not check this word if the user is currently editing it 284 final boolean isEditing; 285 if (mIsSentenceSpellCheckSupported) { 286 // Allow the overlap of the cursor and the first boundary of the spell check span 287 // no to skip the spell check of the following word because the 288 // following word will never be spell-checked even if the user finishes composing 289 isEditing = selectionEnd <= start || selectionStart > end; 290 } else { 291 isEditing = selectionEnd < start || selectionStart > end; 292 } 293 if (start >= 0 && end > start && isEditing) { 294 final String word = (editable instanceof SpannableStringBuilder) ? 295 ((SpannableStringBuilder) editable).substring(start, end) : 296 editable.subSequence(start, end).toString(); 297 spellCheckSpan.setSpellCheckInProgress(true); 298 textInfos[textInfosCount++] = new TextInfo(word, mCookie, mIds[i]); 299 if (DBG) { 300 Log.d(TAG, "create TextInfo: (" + i + "/" + mLength + ")" + word 301 + ", cookie = " + mCookie + ", seq = " 302 + mIds[i] + ", sel start = " + selectionStart + ", sel end = " 303 + selectionEnd + ", start = " + start + ", end = " + end); 304 } 305 } 306 } 307 308 if (textInfosCount > 0) { 309 if (textInfosCount < textInfos.length) { 310 TextInfo[] textInfosCopy = new TextInfo[textInfosCount]; 311 System.arraycopy(textInfos, 0, textInfosCopy, 0, textInfosCount); 312 textInfos = textInfosCopy; 313 } 314 315 if (mIsSentenceSpellCheckSupported) { 316 mSpellCheckerSession.getSentenceSuggestions( 317 textInfos, SuggestionSpan.SUGGESTIONS_MAX_SIZE); 318 } else { 319 mSpellCheckerSession.getSuggestions(textInfos, SuggestionSpan.SUGGESTIONS_MAX_SIZE, 320 false /* TODO Set sequentialWords to true for initial spell check */); 321 } 322 } 323 } 324 325 private SpellCheckSpan onGetSuggestionsInternal( 326 SuggestionsInfo suggestionsInfo, int offset, int length) { 327 if (suggestionsInfo == null || suggestionsInfo.getCookie() != mCookie) { 328 return null; 329 } 330 final Editable editable = (Editable) mTextView.getText(); 331 final int sequenceNumber = suggestionsInfo.getSequence(); 332 for (int k = 0; k < mLength; ++k) { 333 if (sequenceNumber == mIds[k]) { 334 final int attributes = suggestionsInfo.getSuggestionsAttributes(); 335 final boolean isInDictionary = 336 ((attributes & SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY) > 0); 337 final boolean looksLikeTypo = 338 ((attributes & SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO) > 0); 339 340 final SpellCheckSpan spellCheckSpan = mSpellCheckSpans[k]; 341 //TODO: we need to change that rule for results from a sentence-level spell 342 // checker that will probably be in dictionary. 343 if (!isInDictionary && looksLikeTypo) { 344 createMisspelledSuggestionSpan( 345 editable, suggestionsInfo, spellCheckSpan, offset, length); 346 } 347 return spellCheckSpan; 348 } 349 } 350 return null; 351 } 352 353 @Override 354 public void onGetSuggestions(SuggestionsInfo[] results) { 355 final Editable editable = (Editable) mTextView.getText(); 356 for (int i = 0; i < results.length; ++i) { 357 final SpellCheckSpan spellCheckSpan = 358 onGetSuggestionsInternal(results[i], USE_SPAN_RANGE, USE_SPAN_RANGE); 359 if (spellCheckSpan != null) { 360 editable.removeSpan(spellCheckSpan); 361 } 362 } 363 scheduleNewSpellCheck(); 364 } 365 366 @Override 367 public void onGetSentenceSuggestions(SentenceSuggestionsInfo[] results) { 368 final Editable editable = (Editable) mTextView.getText(); 369 370 for (int i = 0; i < results.length; ++i) { 371 final SentenceSuggestionsInfo ssi = results[i]; 372 if (ssi == null) { 373 continue; 374 } 375 SpellCheckSpan spellCheckSpan = null; 376 for (int j = 0; j < ssi.getSuggestionsCount(); ++j) { 377 final SuggestionsInfo suggestionsInfo = ssi.getSuggestionsInfoAt(j); 378 if (suggestionsInfo == null) { 379 continue; 380 } 381 final int offset = ssi.getOffsetAt(j); 382 final int length = ssi.getLengthAt(j); 383 final SpellCheckSpan scs = onGetSuggestionsInternal( 384 suggestionsInfo, offset, length); 385 if (spellCheckSpan == null && scs != null) { 386 // the spellCheckSpan is shared by all the "SuggestionsInfo"s in the same 387 // SentenceSuggestionsInfo 388 spellCheckSpan = scs; 389 } 390 } 391 if (spellCheckSpan != null) { 392 editable.removeSpan(spellCheckSpan); 393 } 394 } 395 scheduleNewSpellCheck(); 396 } 397 398 private void scheduleNewSpellCheck() { 399 if (DBG) { 400 Log.i(TAG, "schedule new spell check."); 401 } 402 if (mSpellRunnable == null) { 403 mSpellRunnable = new Runnable() { 404 @Override 405 public void run() { 406 final int length = mSpellParsers.length; 407 for (int i = 0; i < length; i++) { 408 final SpellParser spellParser = mSpellParsers[i]; 409 if (!spellParser.isFinished()) { 410 spellParser.parse(); 411 break; // run one spell parser at a time to bound running time 412 } 413 } 414 } 415 }; 416 } else { 417 mTextView.removeCallbacks(mSpellRunnable); 418 } 419 420 mTextView.postDelayed(mSpellRunnable, SPELL_PAUSE_DURATION); 421 } 422 423 private void createMisspelledSuggestionSpan(Editable editable, SuggestionsInfo suggestionsInfo, 424 SpellCheckSpan spellCheckSpan, int offset, int length) { 425 final int spellCheckSpanStart = editable.getSpanStart(spellCheckSpan); 426 final int spellCheckSpanEnd = editable.getSpanEnd(spellCheckSpan); 427 if (spellCheckSpanStart < 0 || spellCheckSpanEnd <= spellCheckSpanStart) 428 return; // span was removed in the meantime 429 430 final int start; 431 final int end; 432 if (offset != USE_SPAN_RANGE && length != USE_SPAN_RANGE) { 433 start = spellCheckSpanStart + offset; 434 end = start + length; 435 } else { 436 start = spellCheckSpanStart; 437 end = spellCheckSpanEnd; 438 } 439 440 final int suggestionsCount = suggestionsInfo.getSuggestionsCount(); 441 String[] suggestions; 442 if (suggestionsCount > 0) { 443 suggestions = new String[suggestionsCount]; 444 for (int i = 0; i < suggestionsCount; i++) { 445 suggestions[i] = suggestionsInfo.getSuggestionAt(i); 446 } 447 } else { 448 suggestions = ArrayUtils.emptyArray(String.class); 449 } 450 451 SuggestionSpan suggestionSpan = new SuggestionSpan(mTextView.getContext(), suggestions, 452 SuggestionSpan.FLAG_EASY_CORRECT | SuggestionSpan.FLAG_MISSPELLED); 453 // TODO: Remove mIsSentenceSpellCheckSupported by extracting an interface 454 // to share the logic of word level spell checker and sentence level spell checker 455 if (mIsSentenceSpellCheckSupported) { 456 final Long key = Long.valueOf(TextUtils.packRangeInLong(start, end)); 457 final SuggestionSpan tempSuggestionSpan = mSuggestionSpanCache.get(key); 458 if (tempSuggestionSpan != null) { 459 if (DBG) { 460 Log.i(TAG, "Cached span on the same position is cleard. " 461 + editable.subSequence(start, end)); 462 } 463 editable.removeSpan(tempSuggestionSpan); 464 } 465 mSuggestionSpanCache.put(key, suggestionSpan); 466 } 467 editable.setSpan(suggestionSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); 468 469 mTextView.invalidateRegion(start, end, false /* No cursor involved */); 470 } 471 472 private class SpellParser { 473 private Object mRange = new Object(); 474 475 public void parse(int start, int end) { 476 if (end > start) { 477 setRangeSpan((Editable) mTextView.getText(), start, end); 478 parse(); 479 } 480 } 481 482 public boolean isFinished() { 483 return ((Editable) mTextView.getText()).getSpanStart(mRange) < 0; 484 } 485 486 public void stop() { 487 removeRangeSpan((Editable) mTextView.getText()); 488 } 489 490 private void setRangeSpan(Editable editable, int start, int end) { 491 if (DBG) { 492 Log.d(TAG, "set next range span: " + start + ", " + end); 493 } 494 editable.setSpan(mRange, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); 495 } 496 497 private void removeRangeSpan(Editable editable) { 498 if (DBG) { 499 Log.d(TAG, "Remove range span." + editable.getSpanStart(editable) 500 + editable.getSpanEnd(editable)); 501 } 502 editable.removeSpan(mRange); 503 } 504 505 public void parse() { 506 Editable editable = (Editable) mTextView.getText(); 507 // Iterate over the newly added text and schedule new SpellCheckSpans 508 final int start; 509 if (mIsSentenceSpellCheckSupported) { 510 // TODO: Find the start position of the sentence. 511 // Set span with the context 512 start = Math.max( 513 0, editable.getSpanStart(mRange) - MIN_SENTENCE_LENGTH); 514 } else { 515 start = editable.getSpanStart(mRange); 516 } 517 518 final int end = editable.getSpanEnd(mRange); 519 520 int wordIteratorWindowEnd = Math.min(end, start + WORD_ITERATOR_INTERVAL); 521 mWordIterator.setCharSequence(editable, start, wordIteratorWindowEnd); 522 523 // Move back to the beginning of the current word, if any 524 int wordStart = mWordIterator.preceding(start); 525 int wordEnd; 526 if (wordStart == BreakIterator.DONE) { 527 wordEnd = mWordIterator.following(start); 528 if (wordEnd != BreakIterator.DONE) { 529 wordStart = mWordIterator.getBeginning(wordEnd); 530 } 531 } else { 532 wordEnd = mWordIterator.getEnd(wordStart); 533 } 534 if (wordEnd == BreakIterator.DONE) { 535 if (DBG) { 536 Log.i(TAG, "No more spell check."); 537 } 538 removeRangeSpan(editable); 539 return; 540 } 541 542 // We need to expand by one character because we want to include the spans that 543 // end/start at position start/end respectively. 544 SpellCheckSpan[] spellCheckSpans = editable.getSpans(start - 1, end + 1, 545 SpellCheckSpan.class); 546 SuggestionSpan[] suggestionSpans = editable.getSpans(start - 1, end + 1, 547 SuggestionSpan.class); 548 549 int wordCount = 0; 550 boolean scheduleOtherSpellCheck = false; 551 552 if (mIsSentenceSpellCheckSupported) { 553 if (wordIteratorWindowEnd < end) { 554 if (DBG) { 555 Log.i(TAG, "schedule other spell check."); 556 } 557 // Several batches needed on that region. Cut after last previous word 558 scheduleOtherSpellCheck = true; 559 } 560 int spellCheckEnd = mWordIterator.preceding(wordIteratorWindowEnd); 561 boolean correct = spellCheckEnd != BreakIterator.DONE; 562 if (correct) { 563 spellCheckEnd = mWordIterator.getEnd(spellCheckEnd); 564 correct = spellCheckEnd != BreakIterator.DONE; 565 } 566 if (!correct) { 567 if (DBG) { 568 Log.i(TAG, "Incorrect range span."); 569 } 570 removeRangeSpan(editable); 571 return; 572 } 573 do { 574 // TODO: Find the start position of the sentence. 575 int spellCheckStart = wordStart; 576 boolean createSpellCheckSpan = true; 577 // Cancel or merge overlapped spell check spans 578 for (int i = 0; i < mLength; ++i) { 579 final SpellCheckSpan spellCheckSpan = mSpellCheckSpans[i]; 580 if (mIds[i] < 0 || spellCheckSpan.isSpellCheckInProgress()) { 581 continue; 582 } 583 final int spanStart = editable.getSpanStart(spellCheckSpan); 584 final int spanEnd = editable.getSpanEnd(spellCheckSpan); 585 if (spanEnd < spellCheckStart || spellCheckEnd < spanStart) { 586 // No need to merge 587 continue; 588 } 589 if (spanStart <= spellCheckStart && spellCheckEnd <= spanEnd) { 590 // There is a completely overlapped spell check span 591 // skip this span 592 createSpellCheckSpan = false; 593 if (DBG) { 594 Log.i(TAG, "The range is overrapped. Skip spell check."); 595 } 596 break; 597 } 598 removeSpellCheckSpan(spellCheckSpan); 599 spellCheckStart = Math.min(spanStart, spellCheckStart); 600 spellCheckEnd = Math.max(spanEnd, spellCheckEnd); 601 } 602 603 if (DBG) { 604 Log.d(TAG, "addSpellCheckSpan: " 605 + ", End = " + spellCheckEnd + ", Start = " + spellCheckStart 606 + ", next = " + scheduleOtherSpellCheck + "\n" 607 + editable.subSequence(spellCheckStart, spellCheckEnd)); 608 } 609 610 // Stop spell checking when there are no characters in the range. 611 if (spellCheckEnd < start) { 612 break; 613 } 614 if (createSpellCheckSpan) { 615 addSpellCheckSpan(editable, spellCheckStart, spellCheckEnd); 616 } 617 } while (false); 618 wordStart = spellCheckEnd; 619 } else { 620 while (wordStart <= end) { 621 if (wordEnd >= start && wordEnd > wordStart) { 622 if (wordCount >= MAX_NUMBER_OF_WORDS) { 623 scheduleOtherSpellCheck = true; 624 break; 625 } 626 // A new word has been created across the interval boundaries with this 627 // edit. The previous spans (that ended on start / started on end) are 628 // not valid anymore and must be removed. 629 if (wordStart < start && wordEnd > start) { 630 removeSpansAt(editable, start, spellCheckSpans); 631 removeSpansAt(editable, start, suggestionSpans); 632 } 633 634 if (wordStart < end && wordEnd > end) { 635 removeSpansAt(editable, end, spellCheckSpans); 636 removeSpansAt(editable, end, suggestionSpans); 637 } 638 639 // Do not create new boundary spans if they already exist 640 boolean createSpellCheckSpan = true; 641 if (wordEnd == start) { 642 for (int i = 0; i < spellCheckSpans.length; i++) { 643 final int spanEnd = editable.getSpanEnd(spellCheckSpans[i]); 644 if (spanEnd == start) { 645 createSpellCheckSpan = false; 646 break; 647 } 648 } 649 } 650 651 if (wordStart == end) { 652 for (int i = 0; i < spellCheckSpans.length; i++) { 653 final int spanStart = editable.getSpanStart(spellCheckSpans[i]); 654 if (spanStart == end) { 655 createSpellCheckSpan = false; 656 break; 657 } 658 } 659 } 660 661 if (createSpellCheckSpan) { 662 addSpellCheckSpan(editable, wordStart, wordEnd); 663 } 664 wordCount++; 665 } 666 667 // iterate word by word 668 int originalWordEnd = wordEnd; 669 wordEnd = mWordIterator.following(wordEnd); 670 if ((wordIteratorWindowEnd < end) && 671 (wordEnd == BreakIterator.DONE || wordEnd >= wordIteratorWindowEnd)) { 672 wordIteratorWindowEnd = 673 Math.min(end, originalWordEnd + WORD_ITERATOR_INTERVAL); 674 mWordIterator.setCharSequence( 675 editable, originalWordEnd, wordIteratorWindowEnd); 676 wordEnd = mWordIterator.following(originalWordEnd); 677 } 678 if (wordEnd == BreakIterator.DONE) break; 679 wordStart = mWordIterator.getBeginning(wordEnd); 680 if (wordStart == BreakIterator.DONE) { 681 break; 682 } 683 } 684 } 685 686 if (scheduleOtherSpellCheck) { 687 // Update range span: start new spell check from last wordStart 688 setRangeSpan(editable, wordStart, end); 689 } else { 690 removeRangeSpan(editable); 691 } 692 693 spellCheck(); 694 } 695 696 private <T> void removeSpansAt(Editable editable, int offset, T[] spans) { 697 final int length = spans.length; 698 for (int i = 0; i < length; i++) { 699 final T span = spans[i]; 700 final int start = editable.getSpanStart(span); 701 if (start > offset) continue; 702 final int end = editable.getSpanEnd(span); 703 if (end < offset) continue; 704 editable.removeSpan(span); 705 } 706 } 707 } 708} 709