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/*
* Copyright (C) 2014 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 com.android.inputmethod.latin.spellcheck;
import android.content.res.Resources;
import android.view.textservice.SentenceSuggestionsInfo;
import android.view.textservice.SuggestionsInfo;
import android.view.textservice.TextInfo;
import com.android.inputmethod.compat.TextInfoCompatUtils;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.settings.SpacingAndPunctuations;
import com.android.inputmethod.latin.utils.RunInLocale;
import java.util.ArrayList;
import java.util.Locale;
/**
* This code is mostly lifted directly from android.service.textservice.SpellCheckerService in
* the framework; maybe that should be protected instead, so that implementers don't have to
* rewrite everything for any small change.
*/
public class SentenceLevelAdapter {
private static class EmptySentenceSuggestionsInfosInitializationHolder {
public static final SentenceSuggestionsInfo[] EMPTY_SENTENCE_SUGGESTIONS_INFOS =
new SentenceSuggestionsInfo[]{};
}
private static final SuggestionsInfo EMPTY_SUGGESTIONS_INFO = new SuggestionsInfo(0, null);
public static SentenceSuggestionsInfo[] getEmptySentenceSuggestionsInfo() {
return EmptySentenceSuggestionsInfosInitializationHolder.EMPTY_SENTENCE_SUGGESTIONS_INFOS;
}
/**
* Container for split TextInfo parameters
*/
public static class SentenceWordItem {
public final TextInfo mTextInfo;
public final int mStart;
public final int mLength;
public SentenceWordItem(TextInfo ti, int start, int end) {
mTextInfo = ti;
mStart = start;
mLength = end - start;
}
}
/**
* Container for originally queried TextInfo and parameters
*/
public static class SentenceTextInfoParams {
final TextInfo mOriginalTextInfo;
final ArrayList<SentenceWordItem> mItems;
final int mSize;
public SentenceTextInfoParams(TextInfo ti, ArrayList<SentenceWordItem> items) {
mOriginalTextInfo = ti;
mItems = items;
mSize = items.size();
}
}
private static class WordIterator {
private final SpacingAndPunctuations mSpacingAndPunctuations;
public WordIterator(final Resources res, final Locale locale) {
final RunInLocale<SpacingAndPunctuations> job
= new RunInLocale<SpacingAndPunctuations>() {
@Override
protected SpacingAndPunctuations job(final Resources res) {
return new SpacingAndPunctuations(res);
}
};
mSpacingAndPunctuations = job.runInLocale(res, locale);
}
public int getEndOfWord(final CharSequence sequence, int index) {
final int length = sequence.length();
index = index < 0 ? 0 : Character.offsetByCodePoints(sequence, index, 1);
while (index < length) {
final int codePoint = Character.codePointAt(sequence, index);
if (mSpacingAndPunctuations.isWordSeparator(codePoint)) {
// If it's a period, we want to stop here only if it's followed by another
// word separator. In all other cases we stop here.
if (Constants.CODE_PERIOD == codePoint) {
final int indexOfNextCodePoint =
index + Character.charCount(Constants.CODE_PERIOD);
if (indexOfNextCodePoint < length
&& mSpacingAndPunctuations.isWordSeparator(
Character.codePointAt(sequence, indexOfNextCodePoint))) {
return index;
}
} else {
return index;
}
}
index += Character.charCount(codePoint);
}
return index;
}
public int getBeginningOfNextWord(final CharSequence sequence, int index) {
final int length = sequence.length();
if (index >= length) {
return -1;
}
index = index < 0 ? 0 : Character.offsetByCodePoints(sequence, index, 1);
while (index < length) {
final int codePoint = Character.codePointAt(sequence, index);
if (!mSpacingAndPunctuations.isWordSeparator(codePoint)) {
return index;
}
index += Character.charCount(codePoint);
}
return -1;
}
}
private final WordIterator mWordIterator;
public SentenceLevelAdapter(final Resources res, final Locale locale) {
mWordIterator = new WordIterator(res, locale);
}
public SentenceTextInfoParams getSplitWords(TextInfo originalTextInfo) {
final WordIterator wordIterator = mWordIterator;
final CharSequence originalText =
TextInfoCompatUtils.getCharSequenceOrString(originalTextInfo);
final int cookie = originalTextInfo.getCookie();
final int start = -1;
final int end = originalText.length();
final ArrayList<SentenceWordItem> wordItems = new ArrayList<SentenceWordItem>();
int wordStart = wordIterator.getBeginningOfNextWord(originalText, start);
int wordEnd = wordIterator.getEndOfWord(originalText, wordStart);
while (wordStart <= end && wordEnd != -1 && wordStart != -1) {
if (wordEnd >= start && wordEnd > wordStart) {
final TextInfo ti = TextInfoCompatUtils.newInstance(originalText, wordStart,
wordEnd, cookie, originalText.subSequence(wordStart, wordEnd).hashCode());
wordItems.add(new SentenceWordItem(ti, wordStart, wordEnd));
}
wordStart = wordIterator.getBeginningOfNextWord(originalText, wordEnd);
if (wordStart == -1) {
break;
}
wordEnd = wordIterator.getEndOfWord(originalText, wordStart);
}
return new SentenceTextInfoParams(originalTextInfo, wordItems);
}
public static SentenceSuggestionsInfo reconstructSuggestions(
SentenceTextInfoParams originalTextInfoParams, SuggestionsInfo[] results) {
if (results == null || results.length == 0) {
return null;
}
if (originalTextInfoParams == null) {
return null;
}
final int originalCookie = originalTextInfoParams.mOriginalTextInfo.getCookie();
final int originalSequence =
originalTextInfoParams.mOriginalTextInfo.getSequence();
final int querySize = originalTextInfoParams.mSize;
final int[] offsets = new int[querySize];
final int[] lengths = new int[querySize];
final SuggestionsInfo[] reconstructedSuggestions = new SuggestionsInfo[querySize];
for (int i = 0; i < querySize; ++i) {
final SentenceWordItem item = originalTextInfoParams.mItems.get(i);
SuggestionsInfo result = null;
for (int j = 0; j < results.length; ++j) {
final SuggestionsInfo cur = results[j];
if (cur != null && cur.getSequence() == item.mTextInfo.getSequence()) {
result = cur;
result.setCookieAndSequence(originalCookie, originalSequence);
break;
}
}
offsets[i] = item.mStart;
lengths[i] = item.mLength;
reconstructedSuggestions[i] = result != null ? result : EMPTY_SUGGESTIONS_INFO;
}
return new SentenceSuggestionsInfo(reconstructedSuggestions, offsets, lengths);
}
}
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