/*
* 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 with an interior apostrophe.
// TODO: a better solution to this would be to make the word
// iterator locale-sensitive and include the apostrophe in
// languages that use it (such as English).
final boolean apostrophe = (selectionStart == end + 1 && editable.charAt(end) == '\'');
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 = !apostrophe && (selectionEnd <= start || selectionStart > end);
} else {
isEditing = !apostrophe && (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 <= end) {
// Update range span: start new spell check from last wordStart
setRangeSpan(editable, wordStart, end);
} else {
if (DBG && scheduleOtherSpellCheck) {
Log.w(TAG, "Trying to schedule spellcheck for invalid region, from "
+ wordStart + " to " + end);
}
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;
}
}
|
