1 files changed, 244 insertions, 0 deletions
diff --git a/java/src/org/kelar/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java b/java/src/org/kelar/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
new file mode 100644
index 000000000..fb53b92d7
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
@@ -0,0 +1,244 @@
+/*
+ * 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 org.kelar.inputmethod.latin.spellcheck;
+
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.service.textservice.SpellCheckerService;
+import android.text.InputType;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputMethodSubtype;
+import android.view.textservice.SuggestionsInfo;
+
+import org.kelar.inputmethod.keyboard.Keyboard;
+import org.kelar.inputmethod.keyboard.KeyboardId;
+import org.kelar.inputmethod.keyboard.KeyboardLayoutSet;
+import org.kelar.inputmethod.latin.DictionaryFacilitator;
+import org.kelar.inputmethod.latin.DictionaryFacilitatorLruCache;
+import org.kelar.inputmethod.latin.NgramContext;
+import org.kelar.inputmethod.latin.R;
+import org.kelar.inputmethod.latin.RichInputMethodSubtype;
+import org.kelar.inputmethod.latin.SuggestedWords;
+import org.kelar.inputmethod.latin.common.ComposedData;
+import org.kelar.inputmethod.latin.settings.SettingsValuesForSuggestion;
+import org.kelar.inputmethod.latin.utils.AdditionalSubtypeUtils;
+import org.kelar.inputmethod.latin.utils.ScriptUtils;
+import org.kelar.inputmethod.latin.utils.SuggestionResults;
+
+import java.util.Locale;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.Semaphore;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Service for spell checking, using LatinIME's dictionaries and mechanisms.
+ */
+public final class AndroidSpellCheckerService extends SpellCheckerService
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private static final String TAG = AndroidSpellCheckerService.class.getSimpleName();
+    private static final boolean DEBUG = false;
+
+    public static final String PREF_USE_CONTACTS_KEY = "pref_spellcheck_use_contacts";
+
+    private static final int SPELLCHECKER_DUMMY_KEYBOARD_WIDTH = 480;
+    private static final int SPELLCHECKER_DUMMY_KEYBOARD_HEIGHT = 301;
+
+    private static final String DICTIONARY_NAME_PREFIX = "spellcheck_";
+
+    private static final String[] EMPTY_STRING_ARRAY = new String[0];
+
+    private final int MAX_NUM_OF_THREADS_READ_DICTIONARY = 2;
+    private final Semaphore mSemaphore = new Semaphore(MAX_NUM_OF_THREADS_READ_DICTIONARY,
+            true /* fair */);
+    // TODO: Make each spell checker session has its own session id.
+    private final ConcurrentLinkedQueue<Integer> mSessionIdPool = new ConcurrentLinkedQueue<>();
+
+    private final DictionaryFacilitatorLruCache mDictionaryFacilitatorCache =
+            new DictionaryFacilitatorLruCache(this /* context */, DICTIONARY_NAME_PREFIX);
+    private final ConcurrentHashMap<Locale, Keyboard> mKeyboardCache = new ConcurrentHashMap<>();
+
+    // The threshold for a suggestion to be considered "recommended".
+    private float mRecommendedThreshold;
+    // TODO: make a spell checker option to block offensive words or not
+    private final SettingsValuesForSuggestion mSettingsValuesForSuggestion =
+            new SettingsValuesForSuggestion(true /* blockPotentiallyOffensive */);
+
+    public static final String SINGLE_QUOTE = "\u0027";
+    public static final String APOSTROPHE = "\u2019";
+
+    public AndroidSpellCheckerService() {
+        super();
+        for (int i = 0; i < MAX_NUM_OF_THREADS_READ_DICTIONARY; i++) {
+            mSessionIdPool.add(i);
+        }
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        mRecommendedThreshold = Float.parseFloat(
+                getString(R.string.spellchecker_recommended_threshold_value));
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
+        prefs.registerOnSharedPreferenceChangeListener(this);
+        onSharedPreferenceChanged(prefs, PREF_USE_CONTACTS_KEY);
+    }
+
+    public float getRecommendedThreshold() {
+        return mRecommendedThreshold;
+    }
+
+    private static String getKeyboardLayoutNameForLocale(final Locale locale) {
+        // See b/19963288.
+        if (locale.getLanguage().equals("sr")) {
+            return "south_slavic";
+        }
+        final int script = ScriptUtils.getScriptFromSpellCheckerLocale(locale);
+        switch (script) {
+        case ScriptUtils.SCRIPT_LATIN:
+            return "qwerty";
+        case ScriptUtils.SCRIPT_CYRILLIC:
+            return "east_slavic";
+        case ScriptUtils.SCRIPT_GREEK:
+            return "greek";
+        case ScriptUtils.SCRIPT_HEBREW:
+            return "hebrew";
+        default:
+            throw new RuntimeException("Wrong script supplied: " + script);
+        }
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) {
+        if (!PREF_USE_CONTACTS_KEY.equals(key)) return;
+        final boolean useContactsDictionary = prefs.getBoolean(PREF_USE_CONTACTS_KEY, true);
+        mDictionaryFacilitatorCache.setUseContactsDictionary(useContactsDictionary);
+    }
+
+    @Override
+    public Session createSession() {
+        // Should not refer to AndroidSpellCheckerSession directly considering
+        // that AndroidSpellCheckerSession may be overlaid.
+        return AndroidSpellCheckerSessionFactory.newInstance(this);
+    }
+
+    /**
+     * Returns an empty SuggestionsInfo with flags signaling the word is not in the dictionary.
+     * @param reportAsTypo whether this should include the flag LOOKS_LIKE_TYPO, for red underline.
+     * @return the empty SuggestionsInfo with the appropriate flags set.
+     */
+    public static SuggestionsInfo getNotInDictEmptySuggestions(final boolean reportAsTypo) {
+        return new SuggestionsInfo(reportAsTypo ? SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO : 0,
+                EMPTY_STRING_ARRAY);
+    }
+
+    /**
+     * Returns an empty suggestionInfo with flags signaling the word is in the dictionary.
+     * @return the empty SuggestionsInfo with the appropriate flags set.
+     */
+    public static SuggestionsInfo getInDictEmptySuggestions() {
+        return new SuggestionsInfo(SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY,
+                EMPTY_STRING_ARRAY);
+    }
+
+    public boolean isValidWord(final Locale locale, final String word) {
+        mSemaphore.acquireUninterruptibly();
+        try {
+            DictionaryFacilitator dictionaryFacilitatorForLocale =
+                    mDictionaryFacilitatorCache.get(locale);
+            return dictionaryFacilitatorForLocale.isValidSpellingWord(word);
+        } finally {
+            mSemaphore.release();
+        }
+    }
+
+    public SuggestionResults getSuggestionResults(final Locale locale,
+            final ComposedData composedData, final NgramContext ngramContext,
+            @Nonnull final Keyboard keyboard) {
+        Integer sessionId = null;
+        mSemaphore.acquireUninterruptibly();
+        try {
+            sessionId = mSessionIdPool.poll();
+            DictionaryFacilitator dictionaryFacilitatorForLocale =
+                    mDictionaryFacilitatorCache.get(locale);
+            return dictionaryFacilitatorForLocale.getSuggestionResults(composedData, ngramContext,
+                    keyboard, mSettingsValuesForSuggestion,
+                    sessionId, SuggestedWords.INPUT_STYLE_TYPING);
+        } finally {
+            if (sessionId != null) {
+                mSessionIdPool.add(sessionId);
+            }
+            mSemaphore.release();
+        }
+    }
+
+    public boolean hasMainDictionaryForLocale(final Locale locale) {
+        mSemaphore.acquireUninterruptibly();
+        try {
+            final DictionaryFacilitator dictionaryFacilitator =
+                    mDictionaryFacilitatorCache.get(locale);
+            return dictionaryFacilitator.hasAtLeastOneInitializedMainDictionary();
+        } finally {
+            mSemaphore.release();
+        }
+    }
+
+    @Override
+    public boolean onUnbind(final Intent intent) {
+        mSemaphore.acquireUninterruptibly(MAX_NUM_OF_THREADS_READ_DICTIONARY);
+        try {
+            mDictionaryFacilitatorCache.closeDictionaries();
+        } finally {
+            mSemaphore.release(MAX_NUM_OF_THREADS_READ_DICTIONARY);
+        }
+        mKeyboardCache.clear();
+        return false;
+    }
+
+    public Keyboard getKeyboardForLocale(final Locale locale) {
+        Keyboard keyboard = mKeyboardCache.get(locale);
+        if (keyboard == null) {
+            keyboard = createKeyboardForLocale(locale);
+            if (keyboard != null) {
+                mKeyboardCache.put(locale, keyboard);
+            }
+        }
+        return keyboard;
+    }
+
+    private Keyboard createKeyboardForLocale(final Locale locale) {
+        final String keyboardLayoutName = getKeyboardLayoutNameForLocale(locale);
+        final InputMethodSubtype subtype = AdditionalSubtypeUtils.createDummyAdditionalSubtype(
+                locale.toString(), keyboardLayoutName);
+        final KeyboardLayoutSet keyboardLayoutSet = createKeyboardSetForSpellChecker(subtype);
+        return keyboardLayoutSet.getKeyboard(KeyboardId.ELEMENT_ALPHABET);
+    }
+
+    private KeyboardLayoutSet createKeyboardSetForSpellChecker(final InputMethodSubtype subtype) {
+        final EditorInfo editorInfo = new EditorInfo();
+        editorInfo.inputType = InputType.TYPE_CLASS_TEXT;
+        final KeyboardLayoutSet.Builder builder = new KeyboardLayoutSet.Builder(this, editorInfo);
+        builder.setKeyboardGeometry(
+                SPELLCHECKER_DUMMY_KEYBOARD_WIDTH, SPELLCHECKER_DUMMY_KEYBOARD_HEIGHT);
+        builder.setSubtype(RichInputMethodSubtype.getRichInputMethodSubtype(subtype));
+        builder.setIsSpellChecker(true /* isSpellChecker */);
+        builder.disableTouchPositionCorrectionData();
+        return builder.build();
+    }
+}