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/*
* 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 com.android.inputmethod.latin.spellcheck;
import android.content.res.Resources;
import android.service.textservice.SpellCheckerService;
import android.service.textservice.SpellCheckerService.Session;
import android.util.Log;
import android.view.textservice.SuggestionsInfo;
import android.view.textservice.TextInfo;
import com.android.inputmethod.compat.ArraysCompatUtils;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.ProximityInfo;
import com.android.inputmethod.latin.Dictionary;
import com.android.inputmethod.latin.Dictionary.DataType;
import com.android.inputmethod.latin.Dictionary.WordCallback;
import com.android.inputmethod.latin.DictionaryFactory;
import com.android.inputmethod.latin.Utils;
import com.android.inputmethod.latin.WordComposer;
import java.util.Collections;
import java.util.List;
import java.util.LinkedList;
import java.util.Locale;
import java.util.Map;
import java.util.TreeMap;
/**
* Service for spell checking, using LatinIME's dictionaries and mechanisms.
*/
public class AndroidSpellCheckerService extends SpellCheckerService {
private static final String TAG = AndroidSpellCheckerService.class.getSimpleName();
private static final boolean DBG = true;
private final static String[] emptyArray = new String[0];
private final ProximityInfo mProximityInfo = ProximityInfo.getDummyProximityInfo();
private final Map<String, Dictionary> mDictionaries =
Collections.synchronizedMap(new TreeMap<String, Dictionary>());
@Override
public Session createSession() {
return new AndroidSpellCheckerSession();
}
private static class SuggestionsGatherer implements WordCallback {
private final int DEFAULT_SUGGESTION_LENGTH = 16;
private final String[] mSuggestions;
private final int[] mScores;
private final int mMaxLength;
private int mLength = 0;
SuggestionsGatherer(final int maxLength) {
mMaxLength = maxLength;
mSuggestions = new String[mMaxLength];
mScores = new int[mMaxLength];
}
@Override
synchronized public boolean addWord(char[] word, int wordOffset, int wordLength, int score,
int dicTypeId, DataType dataType) {
final int positionIndex = ArraysCompatUtils.binarySearch(mScores, 0, mLength, score);
// binarySearch returns the index if the element exists, and -<insertion index> - 1
// if it doesn't. See documentation for binarySearch.
final int insertIndex = positionIndex >= 0 ? positionIndex : -positionIndex - 1;
if (mLength < mMaxLength) {
final int copyLen = mLength - insertIndex;
++mLength;
System.arraycopy(mScores, insertIndex, mScores, insertIndex + 1, copyLen);
System.arraycopy(mSuggestions, insertIndex, mSuggestions, insertIndex + 1, copyLen);
} else {
if (insertIndex == 0) return true;
System.arraycopy(mScores, 1, mScores, 0, insertIndex);
System.arraycopy(mSuggestions, 1, mSuggestions, 0, insertIndex);
}
mScores[insertIndex] = score;
mSuggestions[insertIndex] = new String(word, wordOffset, wordLength);
return true;
}
public String[] getGatheredSuggestions() {
if (0 == mLength) return null;
final String[] results = new String[mLength];
for (int i = mLength - 1; i >= 0; --i) {
results[mLength - i - 1] = mSuggestions[i];
}
return results;
}
}
private Dictionary getDictionary(final String locale) {
Dictionary dictionary = mDictionaries.get(locale);
if (null == dictionary) {
final Resources resources = getResources();
final int fallbackResourceId = Utils.getMainDictionaryResourceId(resources);
final Locale localeObject = Utils.constructLocaleFromString(locale);
dictionary = DictionaryFactory.createDictionaryFromManager(this, localeObject,
fallbackResourceId);
mDictionaries.put(locale, dictionary);
}
return dictionary;
}
private class AndroidSpellCheckerSession extends Session {
@Override
public void onCreate() {
}
// Note : this must be reentrant
/**
* Gets a list of suggestions for a specific string. This returns a list of possible
* corrections for the text passed as an arguments. It may split or group words, and
* even perform grammatical analysis.
*/
@Override
public SuggestionsInfo onGetSuggestions(final TextInfo textInfo,
final int suggestionsLimit) {
final String locale = getLocale();
final Dictionary dictionary = getDictionary(locale);
final String text = textInfo.getText();
final SuggestionsGatherer suggestionsGatherer =
new SuggestionsGatherer(suggestionsLimit);
final WordComposer composer = new WordComposer();
final int length = text.length();
for (int i = 0; i < length; ++i) {
int character = text.codePointAt(i);
composer.add(character, new int[] { character },
WordComposer.NOT_A_COORDINATE, WordComposer.NOT_A_COORDINATE);
}
dictionary.getWords(composer, suggestionsGatherer, mProximityInfo);
final boolean isInDict = dictionary.isValidWord(text);
final String[] suggestions = suggestionsGatherer.getGatheredSuggestions();
final int flags =
(isInDict ? SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY : 0)
| (null != suggestions
? SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO : 0);
return new SuggestionsInfo(flags, suggestions);
}
}
}
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