| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.widget; |
| |
| import android.content.Context; |
| import android.text.Editable; |
| import android.text.Selection; |
| import android.text.Spanned; |
| import android.text.TextUtils; |
| import android.text.method.WordIterator; |
| import android.text.style.SpellCheckSpan; |
| import android.text.style.SuggestionSpan; |
| import android.util.Log; |
| import android.util.LruCache; |
| import android.view.textservice.SentenceSuggestionsInfo; |
| import android.view.textservice.SpellCheckerSession; |
| import android.view.textservice.SpellCheckerSession.SpellCheckerSessionListener; |
| import android.view.textservice.SuggestionsInfo; |
| import android.view.textservice.TextInfo; |
| import android.view.textservice.TextServicesManager; |
| |
| import com.android.internal.util.ArrayUtils; |
| import com.android.internal.util.GrowingArrayUtils; |
| |
| import java.text.BreakIterator; |
| import java.util.Locale; |
| |
| |
| /** |
| * Helper class for TextView. Bridge between the TextView and the Dictionary service. |
| * |
| * @hide |
| */ |
| public class SpellChecker implements SpellCheckerSessionListener { |
| private static final String TAG = SpellChecker.class.getSimpleName(); |
| private static final boolean DBG = false; |
| |
| // No more than this number of words will be parsed on each iteration to ensure a minimum |
| // lock of the UI thread |
| public static final int MAX_NUMBER_OF_WORDS = 50; |
| |
| // Rough estimate, such that the word iterator interval usually does not need to be shifted |
| public static final int AVERAGE_WORD_LENGTH = 7; |
| |
| // When parsing, use a character window of that size. Will be shifted if needed |
| public static final int WORD_ITERATOR_INTERVAL = AVERAGE_WORD_LENGTH * MAX_NUMBER_OF_WORDS; |
| |
| // Pause between each spell check to keep the UI smooth |
| private final static int SPELL_PAUSE_DURATION = 400; // milliseconds |
| |
| private static final int MIN_SENTENCE_LENGTH = 50; |
| |
| private static final int USE_SPAN_RANGE = -1; |
| |
| private final TextView mTextView; |
| |
| SpellCheckerSession mSpellCheckerSession; |
| // We assume that the sentence level spell check will always provide better results than words. |
| // Although word SC has a sequential option. |
| private boolean mIsSentenceSpellCheckSupported; |
| final int mCookie; |
| |
| // Paired arrays for the (id, spellCheckSpan) pair. A negative id means the associated |
| // SpellCheckSpan has been recycled and can be-reused. |
| // Contains null SpellCheckSpans after index mLength. |
| private int[] mIds; |
| private SpellCheckSpan[] mSpellCheckSpans; |
| // The mLength first elements of the above arrays have been initialized |
| private int mLength; |
| |
| // Parsers on chunk of text, cutting text into words that will be checked |
| private SpellParser[] mSpellParsers = new SpellParser[0]; |
| |
| private int mSpanSequenceCounter = 0; |
| |
| private Locale mCurrentLocale; |
| |
| // Shared by all SpellParsers. Cannot be shared with TextView since it may be used |
| // concurrently due to the asynchronous nature of onGetSuggestions. |
| private WordIterator mWordIterator; |
| |
| private TextServicesManager mTextServicesManager; |
| |
| private Runnable mSpellRunnable; |
| |
| private static final int SUGGESTION_SPAN_CACHE_SIZE = 10; |
| private final LruCache<Long, SuggestionSpan> mSuggestionSpanCache = |
| new LruCache<Long, SuggestionSpan>(SUGGESTION_SPAN_CACHE_SIZE); |
| |
| public SpellChecker(TextView textView) { |
| mTextView = textView; |
| |
| // Arbitrary: these arrays will automatically double their sizes on demand |
| final int size = 1; |
| mIds = ArrayUtils.newUnpaddedIntArray(size); |
| mSpellCheckSpans = new SpellCheckSpan[mIds.length]; |
| |
| setLocale(mTextView.getSpellCheckerLocale()); |
| |
| mCookie = hashCode(); |
| } |
| |
| private void resetSession() { |
| closeSession(); |
| |
| mTextServicesManager = (TextServicesManager) mTextView.getContext(). |
| getSystemService(Context.TEXT_SERVICES_MANAGER_SERVICE); |
| if (!mTextServicesManager.isSpellCheckerEnabled() |
| || mCurrentLocale == null |
| || mTextServicesManager.getCurrentSpellCheckerSubtype(true) == null) { |
| mSpellCheckerSession = null; |
| } else { |
| mSpellCheckerSession = mTextServicesManager.newSpellCheckerSession( |
| null /* Bundle not currently used by the textServicesManager */, |
| mCurrentLocale, this, |
| false /* means any available languages from current spell checker */); |
| mIsSentenceSpellCheckSupported = true; |
| } |
| |
| // Restore SpellCheckSpans in pool |
| for (int i = 0; i < mLength; i++) { |
| mIds[i] = -1; |
| } |
| mLength = 0; |
| |
| // Remove existing misspelled SuggestionSpans |
| mTextView.removeMisspelledSpans((Editable) mTextView.getText()); |
| mSuggestionSpanCache.evictAll(); |
| } |
| |
| private void setLocale(Locale locale) { |
| mCurrentLocale = locale; |
| |
| resetSession(); |
| |
| if (locale != null) { |
| // Change SpellParsers' wordIterator locale |
| mWordIterator = new WordIterator(locale); |
| } |
| |
| // This class is the listener for locale change: warn other locale-aware objects |
| mTextView.onLocaleChanged(); |
| } |
| |
| /** |
| * @return true if a spell checker session has successfully been created. Returns false if not, |
| * for instance when spell checking has been disabled in settings. |
| */ |
| private boolean isSessionActive() { |
| return mSpellCheckerSession != null; |
| } |
| |
| public void closeSession() { |
| if (mSpellCheckerSession != null) { |
| mSpellCheckerSession.close(); |
| } |
| |
| final int length = mSpellParsers.length; |
| for (int i = 0; i < length; i++) { |
| mSpellParsers[i].stop(); |
| } |
| |
| if (mSpellRunnable != null) { |
| mTextView.removeCallbacks(mSpellRunnable); |
| } |
| } |
| |
| private int nextSpellCheckSpanIndex() { |
| for (int i = 0; i < mLength; i++) { |
| if (mIds[i] < 0) return i; |
| } |
| |
| mIds = GrowingArrayUtils.append(mIds, mLength, 0); |
| mSpellCheckSpans = GrowingArrayUtils.append( |
| mSpellCheckSpans, mLength, new SpellCheckSpan()); |
| mLength++; |
| return mLength - 1; |
| } |
| |
| private void addSpellCheckSpan(Editable editable, int start, int end) { |
| final int index = nextSpellCheckSpanIndex(); |
| SpellCheckSpan spellCheckSpan = mSpellCheckSpans[index]; |
| editable.setSpan(spellCheckSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| spellCheckSpan.setSpellCheckInProgress(false); |
| mIds[index] = mSpanSequenceCounter++; |
| } |
| |
| public void onSpellCheckSpanRemoved(SpellCheckSpan spellCheckSpan) { |
| // Recycle any removed SpellCheckSpan (from this code or during text edition) |
| for (int i = 0; i < mLength; i++) { |
| if (mSpellCheckSpans[i] == spellCheckSpan) { |
| mIds[i] = -1; |
| return; |
| } |
| } |
| } |
| |
| public void onSelectionChanged() { |
| spellCheck(); |
| } |
| |
| public void spellCheck(int start, int end) { |
| if (DBG) { |
| Log.d(TAG, "Start spell-checking: " + start + ", " + end); |
| } |
| final Locale locale = mTextView.getSpellCheckerLocale(); |
| final boolean isSessionActive = isSessionActive(); |
| if (locale == null || mCurrentLocale == null || (!(mCurrentLocale.equals(locale)))) { |
| setLocale(locale); |
| // Re-check the entire text |
| start = 0; |
| end = mTextView.getText().length(); |
| } else { |
| final boolean spellCheckerActivated = mTextServicesManager.isSpellCheckerEnabled(); |
| if (isSessionActive != spellCheckerActivated) { |
| // Spell checker has been turned of or off since last spellCheck |
| resetSession(); |
| } |
| } |
| |
| if (!isSessionActive) return; |
| |
| // Find first available SpellParser from pool |
| final int length = mSpellParsers.length; |
| for (int i = 0; i < length; i++) { |
| final SpellParser spellParser = mSpellParsers[i]; |
| if (spellParser.isFinished()) { |
| spellParser.parse(start, end); |
| return; |
| } |
| } |
| |
| if (DBG) { |
| Log.d(TAG, "new spell parser."); |
| } |
| // No available parser found in pool, create a new one |
| SpellParser[] newSpellParsers = new SpellParser[length + 1]; |
| System.arraycopy(mSpellParsers, 0, newSpellParsers, 0, length); |
| mSpellParsers = newSpellParsers; |
| |
| SpellParser spellParser = new SpellParser(); |
| mSpellParsers[length] = spellParser; |
| spellParser.parse(start, end); |
| } |
| |
| private void spellCheck() { |
| if (mSpellCheckerSession == null) return; |
| |
| Editable editable = (Editable) mTextView.getText(); |
| final int selectionStart = Selection.getSelectionStart(editable); |
| final int selectionEnd = Selection.getSelectionEnd(editable); |
| |
| TextInfo[] textInfos = new TextInfo[mLength]; |
| int textInfosCount = 0; |
| |
| for (int i = 0; i < mLength; i++) { |
| final SpellCheckSpan spellCheckSpan = mSpellCheckSpans[i]; |
| if (mIds[i] < 0 || spellCheckSpan.isSpellCheckInProgress()) continue; |
| |
| final int start = editable.getSpanStart(spellCheckSpan); |
| final int end = editable.getSpanEnd(spellCheckSpan); |
| |
| // Do not check this word if the user is currently editing it |
| final boolean isEditing; |
| |
| // Defer spell check when typing a word ending with a punctuation like an apostrophe |
| // which could end up being a mid-word punctuation. |
| if (selectionStart == end + 1 |
| && WordIterator.isMidWordPunctuation( |
| mCurrentLocale, Character.codePointBefore(editable, end + 1))) { |
| isEditing = false; |
| } else if (mIsSentenceSpellCheckSupported) { |
| // Allow the overlap of the cursor and the first boundary of the spell check span |
| // no to skip the spell check of the following word because the |
| // following word will never be spell-checked even if the user finishes composing |
| isEditing = selectionEnd <= start || selectionStart > end; |
| } else { |
| isEditing = selectionEnd < start || selectionStart > end; |
| } |
| if (start >= 0 && end > start && isEditing) { |
| spellCheckSpan.setSpellCheckInProgress(true); |
| final TextInfo textInfo = new TextInfo(editable, start, end, mCookie, mIds[i]); |
| textInfos[textInfosCount++] = textInfo; |
| if (DBG) { |
| Log.d(TAG, "create TextInfo: (" + i + "/" + mLength + ") text = " |
| + textInfo.getSequence() + ", cookie = " + mCookie + ", seq = " |
| + mIds[i] + ", sel start = " + selectionStart + ", sel end = " |
| + selectionEnd + ", start = " + start + ", end = " + end); |
| } |
| } |
| } |
| |
| if (textInfosCount > 0) { |
| if (textInfosCount < textInfos.length) { |
| TextInfo[] textInfosCopy = new TextInfo[textInfosCount]; |
| System.arraycopy(textInfos, 0, textInfosCopy, 0, textInfosCount); |
| textInfos = textInfosCopy; |
| } |
| |
| if (mIsSentenceSpellCheckSupported) { |
| mSpellCheckerSession.getSentenceSuggestions( |
| textInfos, SuggestionSpan.SUGGESTIONS_MAX_SIZE); |
| } else { |
| mSpellCheckerSession.getSuggestions(textInfos, SuggestionSpan.SUGGESTIONS_MAX_SIZE, |
| false /* TODO Set sequentialWords to true for initial spell check */); |
| } |
| } |
| } |
| |
| private SpellCheckSpan onGetSuggestionsInternal( |
| SuggestionsInfo suggestionsInfo, int offset, int length) { |
| if (suggestionsInfo == null || suggestionsInfo.getCookie() != mCookie) { |
| return null; |
| } |
| final Editable editable = (Editable) mTextView.getText(); |
| final int sequenceNumber = suggestionsInfo.getSequence(); |
| for (int k = 0; k < mLength; ++k) { |
| if (sequenceNumber == mIds[k]) { |
| final int attributes = suggestionsInfo.getSuggestionsAttributes(); |
| final boolean isInDictionary = |
| ((attributes & SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY) > 0); |
| final boolean looksLikeTypo = |
| ((attributes & SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO) > 0); |
| |
| final SpellCheckSpan spellCheckSpan = mSpellCheckSpans[k]; |
| //TODO: we need to change that rule for results from a sentence-level spell |
| // checker that will probably be in dictionary. |
| if (!isInDictionary && looksLikeTypo) { |
| createMisspelledSuggestionSpan( |
| editable, suggestionsInfo, spellCheckSpan, offset, length); |
| } else { |
| // Valid word -- isInDictionary || !looksLikeTypo |
| if (mIsSentenceSpellCheckSupported) { |
| // Allow the spell checker to remove existing misspelled span by |
| // overwriting the span over the same place |
| final int spellCheckSpanStart = editable.getSpanStart(spellCheckSpan); |
| final int spellCheckSpanEnd = editable.getSpanEnd(spellCheckSpan); |
| final int start; |
| final int end; |
| if (offset != USE_SPAN_RANGE && length != USE_SPAN_RANGE) { |
| start = spellCheckSpanStart + offset; |
| end = start + length; |
| } else { |
| start = spellCheckSpanStart; |
| end = spellCheckSpanEnd; |
| } |
| if (spellCheckSpanStart >= 0 && spellCheckSpanEnd > spellCheckSpanStart |
| && end > start) { |
| final Long key = Long.valueOf(TextUtils.packRangeInLong(start, end)); |
| final SuggestionSpan tempSuggestionSpan = mSuggestionSpanCache.get(key); |
| if (tempSuggestionSpan != null) { |
| if (DBG) { |
| Log.i(TAG, "Remove existing misspelled span. " |
| + editable.subSequence(start, end)); |
| } |
| editable.removeSpan(tempSuggestionSpan); |
| mSuggestionSpanCache.remove(key); |
| } |
| } |
| } |
| } |
| return spellCheckSpan; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public void onGetSuggestions(SuggestionsInfo[] results) { |
| final Editable editable = (Editable) mTextView.getText(); |
| for (int i = 0; i < results.length; ++i) { |
| final SpellCheckSpan spellCheckSpan = |
| onGetSuggestionsInternal(results[i], USE_SPAN_RANGE, USE_SPAN_RANGE); |
| if (spellCheckSpan != null) { |
| // onSpellCheckSpanRemoved will recycle this span in the pool |
| editable.removeSpan(spellCheckSpan); |
| } |
| } |
| scheduleNewSpellCheck(); |
| } |
| |
| @Override |
| public void onGetSentenceSuggestions(SentenceSuggestionsInfo[] results) { |
| final Editable editable = (Editable) mTextView.getText(); |
| |
| for (int i = 0; i < results.length; ++i) { |
| final SentenceSuggestionsInfo ssi = results[i]; |
| if (ssi == null) { |
| continue; |
| } |
| SpellCheckSpan spellCheckSpan = null; |
| for (int j = 0; j < ssi.getSuggestionsCount(); ++j) { |
| final SuggestionsInfo suggestionsInfo = ssi.getSuggestionsInfoAt(j); |
| if (suggestionsInfo == null) { |
| continue; |
| } |
| final int offset = ssi.getOffsetAt(j); |
| final int length = ssi.getLengthAt(j); |
| final SpellCheckSpan scs = onGetSuggestionsInternal( |
| suggestionsInfo, offset, length); |
| if (spellCheckSpan == null && scs != null) { |
| // the spellCheckSpan is shared by all the "SuggestionsInfo"s in the same |
| // SentenceSuggestionsInfo. Removal is deferred after this loop. |
| spellCheckSpan = scs; |
| } |
| } |
| if (spellCheckSpan != null) { |
| // onSpellCheckSpanRemoved will recycle this span in the pool |
| editable.removeSpan(spellCheckSpan); |
| } |
| } |
| scheduleNewSpellCheck(); |
| } |
| |
| private void scheduleNewSpellCheck() { |
| if (DBG) { |
| Log.i(TAG, "schedule new spell check."); |
| } |
| if (mSpellRunnable == null) { |
| mSpellRunnable = new Runnable() { |
| @Override |
| public void run() { |
| final int length = mSpellParsers.length; |
| for (int i = 0; i < length; i++) { |
| final SpellParser spellParser = mSpellParsers[i]; |
| if (!spellParser.isFinished()) { |
| spellParser.parse(); |
| break; // run one spell parser at a time to bound running time |
| } |
| } |
| } |
| }; |
| } else { |
| mTextView.removeCallbacks(mSpellRunnable); |
| } |
| |
| mTextView.postDelayed(mSpellRunnable, SPELL_PAUSE_DURATION); |
| } |
| |
| private void createMisspelledSuggestionSpan(Editable editable, SuggestionsInfo suggestionsInfo, |
| SpellCheckSpan spellCheckSpan, int offset, int length) { |
| final int spellCheckSpanStart = editable.getSpanStart(spellCheckSpan); |
| final int spellCheckSpanEnd = editable.getSpanEnd(spellCheckSpan); |
| if (spellCheckSpanStart < 0 || spellCheckSpanEnd <= spellCheckSpanStart) |
| return; // span was removed in the meantime |
| |
| final int start; |
| final int end; |
| if (offset != USE_SPAN_RANGE && length != USE_SPAN_RANGE) { |
| start = spellCheckSpanStart + offset; |
| end = start + length; |
| } else { |
| start = spellCheckSpanStart; |
| end = spellCheckSpanEnd; |
| } |
| |
| final int suggestionsCount = suggestionsInfo.getSuggestionsCount(); |
| String[] suggestions; |
| if (suggestionsCount > 0) { |
| suggestions = new String[suggestionsCount]; |
| for (int i = 0; i < suggestionsCount; i++) { |
| suggestions[i] = suggestionsInfo.getSuggestionAt(i); |
| } |
| } else { |
| suggestions = ArrayUtils.emptyArray(String.class); |
| } |
| |
| SuggestionSpan suggestionSpan = new SuggestionSpan(mTextView.getContext(), suggestions, |
| SuggestionSpan.FLAG_EASY_CORRECT | SuggestionSpan.FLAG_MISSPELLED); |
| // TODO: Remove mIsSentenceSpellCheckSupported by extracting an interface |
| // to share the logic of word level spell checker and sentence level spell checker |
| if (mIsSentenceSpellCheckSupported) { |
| final Long key = Long.valueOf(TextUtils.packRangeInLong(start, end)); |
| final SuggestionSpan tempSuggestionSpan = mSuggestionSpanCache.get(key); |
| if (tempSuggestionSpan != null) { |
| if (DBG) { |
| Log.i(TAG, "Cached span on the same position is cleard. " |
| + editable.subSequence(start, end)); |
| } |
| editable.removeSpan(tempSuggestionSpan); |
| } |
| mSuggestionSpanCache.put(key, suggestionSpan); |
| } |
| editable.setSpan(suggestionSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| |
| mTextView.invalidateRegion(start, end, false /* No cursor involved */); |
| } |
| |
| private class SpellParser { |
| private Object mRange = new Object(); |
| |
| public void parse(int start, int end) { |
| final int max = mTextView.length(); |
| final int parseEnd; |
| if (end > max) { |
| Log.w(TAG, "Parse invalid region, from " + start + " to " + end); |
| parseEnd = max; |
| } else { |
| parseEnd = end; |
| } |
| if (parseEnd > start) { |
| setRangeSpan((Editable) mTextView.getText(), start, parseEnd); |
| parse(); |
| } |
| } |
| |
| public boolean isFinished() { |
| return ((Editable) mTextView.getText()).getSpanStart(mRange) < 0; |
| } |
| |
| public void stop() { |
| removeRangeSpan((Editable) mTextView.getText()); |
| } |
| |
| private void setRangeSpan(Editable editable, int start, int end) { |
| if (DBG) { |
| Log.d(TAG, "set next range span: " + start + ", " + end); |
| } |
| editable.setSpan(mRange, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| } |
| |
| private void removeRangeSpan(Editable editable) { |
| if (DBG) { |
| Log.d(TAG, "Remove range span." + editable.getSpanStart(editable) |
| + editable.getSpanEnd(editable)); |
| } |
| editable.removeSpan(mRange); |
| } |
| |
| public void parse() { |
| Editable editable = (Editable) mTextView.getText(); |
| // Iterate over the newly added text and schedule new SpellCheckSpans |
| final int start; |
| if (mIsSentenceSpellCheckSupported) { |
| // TODO: Find the start position of the sentence. |
| // Set span with the context |
| start = Math.max( |
| 0, editable.getSpanStart(mRange) - MIN_SENTENCE_LENGTH); |
| } else { |
| start = editable.getSpanStart(mRange); |
| } |
| |
| final int end = editable.getSpanEnd(mRange); |
| |
| int wordIteratorWindowEnd = Math.min(end, start + WORD_ITERATOR_INTERVAL); |
| mWordIterator.setCharSequence(editable, start, wordIteratorWindowEnd); |
| |
| // Move back to the beginning of the current word, if any |
| int wordStart = mWordIterator.preceding(start); |
| int wordEnd; |
| if (wordStart == BreakIterator.DONE) { |
| wordEnd = mWordIterator.following(start); |
| if (wordEnd != BreakIterator.DONE) { |
| wordStart = mWordIterator.getBeginning(wordEnd); |
| } |
| } else { |
| wordEnd = mWordIterator.getEnd(wordStart); |
| } |
| if (wordEnd == BreakIterator.DONE) { |
| if (DBG) { |
| Log.i(TAG, "No more spell check."); |
| } |
| removeRangeSpan(editable); |
| return; |
| } |
| |
| // We need to expand by one character because we want to include the spans that |
| // end/start at position start/end respectively. |
| SpellCheckSpan[] spellCheckSpans = editable.getSpans(start - 1, end + 1, |
| SpellCheckSpan.class); |
| SuggestionSpan[] suggestionSpans = editable.getSpans(start - 1, end + 1, |
| SuggestionSpan.class); |
| |
| int wordCount = 0; |
| boolean scheduleOtherSpellCheck = false; |
| |
| if (mIsSentenceSpellCheckSupported) { |
| if (wordIteratorWindowEnd < end) { |
| if (DBG) { |
| Log.i(TAG, "schedule other spell check."); |
| } |
| // Several batches needed on that region. Cut after last previous word |
| scheduleOtherSpellCheck = true; |
| } |
| int spellCheckEnd = mWordIterator.preceding(wordIteratorWindowEnd); |
| boolean correct = spellCheckEnd != BreakIterator.DONE; |
| if (correct) { |
| spellCheckEnd = mWordIterator.getEnd(spellCheckEnd); |
| correct = spellCheckEnd != BreakIterator.DONE; |
| } |
| if (!correct) { |
| if (DBG) { |
| Log.i(TAG, "Incorrect range span."); |
| } |
| removeRangeSpan(editable); |
| return; |
| } |
| do { |
| // TODO: Find the start position of the sentence. |
| int spellCheckStart = wordStart; |
| boolean createSpellCheckSpan = true; |
| // Cancel or merge overlapped spell check spans |
| for (int i = 0; i < mLength; ++i) { |
| final SpellCheckSpan spellCheckSpan = mSpellCheckSpans[i]; |
| if (mIds[i] < 0 || spellCheckSpan.isSpellCheckInProgress()) { |
| continue; |
| } |
| final int spanStart = editable.getSpanStart(spellCheckSpan); |
| final int spanEnd = editable.getSpanEnd(spellCheckSpan); |
| if (spanEnd < spellCheckStart || spellCheckEnd < spanStart) { |
| // No need to merge |
| continue; |
| } |
| if (spanStart <= spellCheckStart && spellCheckEnd <= spanEnd) { |
| // There is a completely overlapped spell check span |
| // skip this span |
| createSpellCheckSpan = false; |
| if (DBG) { |
| Log.i(TAG, "The range is overrapped. Skip spell check."); |
| } |
| break; |
| } |
| // This spellCheckSpan is replaced by the one we are creating |
| editable.removeSpan(spellCheckSpan); |
| spellCheckStart = Math.min(spanStart, spellCheckStart); |
| spellCheckEnd = Math.max(spanEnd, spellCheckEnd); |
| } |
| |
| if (DBG) { |
| Log.d(TAG, "addSpellCheckSpan: " |
| + ", End = " + spellCheckEnd + ", Start = " + spellCheckStart |
| + ", next = " + scheduleOtherSpellCheck + "\n" |
| + editable.subSequence(spellCheckStart, spellCheckEnd)); |
| } |
| |
| // Stop spell checking when there are no characters in the range. |
| if (spellCheckEnd < start) { |
| break; |
| } |
| if (spellCheckEnd <= spellCheckStart) { |
| Log.w(TAG, "Trying to spellcheck invalid region, from " |
| + start + " to " + end); |
| break; |
| } |
| if (createSpellCheckSpan) { |
| addSpellCheckSpan(editable, spellCheckStart, spellCheckEnd); |
| } |
| } while (false); |
| wordStart = spellCheckEnd; |
| } else { |
| while (wordStart <= end) { |
| if (wordEnd >= start && wordEnd > wordStart) { |
| if (wordCount >= MAX_NUMBER_OF_WORDS) { |
| scheduleOtherSpellCheck = true; |
| break; |
| } |
| // A new word has been created across the interval boundaries with this |
| // edit. The previous spans (that ended on start / started on end) are |
| // not valid anymore and must be removed. |
| if (wordStart < start && wordEnd > start) { |
| removeSpansAt(editable, start, spellCheckSpans); |
| removeSpansAt(editable, start, suggestionSpans); |
| } |
| |
| if (wordStart < end && wordEnd > end) { |
| removeSpansAt(editable, end, spellCheckSpans); |
| removeSpansAt(editable, end, suggestionSpans); |
| } |
| |
| // Do not create new boundary spans if they already exist |
| boolean createSpellCheckSpan = true; |
| if (wordEnd == start) { |
| for (int i = 0; i < spellCheckSpans.length; i++) { |
| final int spanEnd = editable.getSpanEnd(spellCheckSpans[i]); |
| if (spanEnd == start) { |
| createSpellCheckSpan = false; |
| break; |
| } |
| } |
| } |
| |
| if (wordStart == end) { |
| for (int i = 0; i < spellCheckSpans.length; i++) { |
| final int spanStart = editable.getSpanStart(spellCheckSpans[i]); |
| if (spanStart == end) { |
| createSpellCheckSpan = false; |
| break; |
| } |
| } |
| } |
| |
| if (createSpellCheckSpan) { |
| addSpellCheckSpan(editable, wordStart, wordEnd); |
| } |
| wordCount++; |
| } |
| |
| // iterate word by word |
| int originalWordEnd = wordEnd; |
| wordEnd = mWordIterator.following(wordEnd); |
| if ((wordIteratorWindowEnd < end) && |
| (wordEnd == BreakIterator.DONE || wordEnd >= wordIteratorWindowEnd)) { |
| wordIteratorWindowEnd = |
| Math.min(end, originalWordEnd + WORD_ITERATOR_INTERVAL); |
| mWordIterator.setCharSequence( |
| editable, originalWordEnd, wordIteratorWindowEnd); |
| wordEnd = mWordIterator.following(originalWordEnd); |
| } |
| if (wordEnd == BreakIterator.DONE) break; |
| wordStart = mWordIterator.getBeginning(wordEnd); |
| if (wordStart == BreakIterator.DONE) { |
| break; |
| } |
| } |
| } |
| |
| if (scheduleOtherSpellCheck && wordStart != BreakIterator.DONE && wordStart <= end) { |
| // Update range span: start new spell check from last wordStart |
| setRangeSpan(editable, wordStart, end); |
| } else { |
| removeRangeSpan(editable); |
| } |
| |
| spellCheck(); |
| } |
| |
| private <T> void removeSpansAt(Editable editable, int offset, T[] spans) { |
| final int length = spans.length; |
| for (int i = 0; i < length; i++) { |
| final T span = spans[i]; |
| final int start = editable.getSpanStart(span); |
| if (start > offset) continue; |
| final int end = editable.getSpanEnd(span); |
| if (end < offset) continue; |
| editable.removeSpan(span); |
| } |
| } |
| } |
| |
| public static boolean haveWordBoundariesChanged(final Editable editable, final int start, |
| final int end, final int spanStart, final int spanEnd) { |
| final boolean haveWordBoundariesChanged; |
| if (spanEnd != start && spanStart != end) { |
| haveWordBoundariesChanged = true; |
| if (DBG) { |
| Log.d(TAG, "(1) Text inside the span has been modified. Remove."); |
| } |
| } else if (spanEnd == start && start < editable.length()) { |
| final int codePoint = Character.codePointAt(editable, start); |
| haveWordBoundariesChanged = Character.isLetterOrDigit(codePoint); |
| if (DBG) { |
| Log.d(TAG, "(2) Characters have been appended to the spanned text. " |
| + (haveWordBoundariesChanged ? "Remove.<" : "Keep. <") + (char)(codePoint) |
| + ">, " + editable + ", " + editable.subSequence(spanStart, spanEnd) + ", " |
| + start); |
| } |
| } else if (spanStart == end && end > 0) { |
| final int codePoint = Character.codePointBefore(editable, end); |
| haveWordBoundariesChanged = Character.isLetterOrDigit(codePoint); |
| if (DBG) { |
| Log.d(TAG, "(3) Characters have been prepended to the spanned text. " |
| + (haveWordBoundariesChanged ? "Remove.<" : "Keep.<") + (char)(codePoint) |
| + ">, " + editable + ", " + editable.subSequence(spanStart, spanEnd) + ", " |
| + end); |
| } |
| } else { |
| if (DBG) { |
| Log.d(TAG, "(4) Characters adjacent to the spanned text were deleted. Keep."); |
| } |
| haveWordBoundariesChanged = false; |
| } |
| return haveWordBoundariesChanged; |
| } |
| } |
