Add spell checking core methods.

-keep class com.android.inputmethod.latin.Utils {

  boolean equalsIgnoreCase(...);

}

-keep class com.android.inputmethod.latin.spellcheck.SpellChecker {

  *;

}

/*

 * 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.Context;

import android.content.res.Resources;

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.Arrays;

import java.util.LinkedList;

import java.util.List;

import java.util.Locale;

/**

 * Implements spell checking methods.

 */

public class SpellChecker {

    public final Dictionary mDictionary;

    public SpellChecker(final Context context, final Locale locale) {

        final Resources resources = context.getResources();

        final int fallbackResourceId = Utils.getMainDictionaryResourceId(resources);

        mDictionary = DictionaryFactory.createDictionaryFromManager(context, locale,

                fallbackResourceId);

    }

    // Note : this must be reentrant

    /**

     * Finds out whether a word is in the dictionary or not.

     *

     * @param text the sequence containing the word to check for.

     * @param start the index of the first character of the word in text.

     * @param end the index of the next-to-last character in text.

     * @return true if the word is in the dictionary, false otherwise.

     */

    public boolean isCorrect(final CharSequence text, final int start, final int end) {

        return mDictionary.isValidWord(text.subSequence(start, end));

    }

    private static class SuggestionsGatherer implements WordCallback {

        private final int DEFAULT_SUGGESTION_LENGTH = 16;

        private final List<String> mSuggestions = new LinkedList<String>();

        private int[] mScores = new int[DEFAULT_SUGGESTION_LENGTH];

        private int mLength = 0;

        synchronized public boolean addWord(char[] word, int wordOffset, int wordLength, int score,

                int dicTypeId, DataType dataType) {

            if (mLength >= mScores.length) {

                final int newLength = mScores.length * 2;

                mScores = new int[newLength];

            }

            final int positionIndex = Arrays.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 insertionIndex = positionIndex >= 0 ? positionIndex : -positionIndex - 1;

            System.arraycopy(mScores, insertionIndex, mScores, insertionIndex + 1,

                    mLength - insertionIndex);

            mLength += 1;

            mScores[insertionIndex] = score;

            mSuggestions.add(insertionIndex, new String(word, wordOffset, wordLength));

            return true;

        }

        public List<String> getGatheredSuggestions() {

            return mSuggestions;

        }

    }

    // 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.

     *

     * @param text the sequence containing the word to check for.

     * @param start the index of the first character of the word in text.

     * @param end the index of the next-to-last character in text.

     * @return a list of possible suggestions to replace the text.

     */

    public List<String> getSuggestions(final CharSequence text, final int start, final int end) {

        final SuggestionsGatherer suggestionsGatherer = new SuggestionsGatherer();

        final WordComposer composer = new WordComposer();

        for (int i = start; i < end; ++i) {

            int character = text.charAt(i);

            composer.add(character, new int[] { character },

                    WordComposer.NOT_A_COORDINATE, WordComposer.NOT_A_COORDINATE);

        }

        mDictionary.getWords(composer, suggestionsGatherer);

        return suggestionsGatherer.getGatheredSuggestions();

    }

}