/* * Copyright (C) 2013 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.inputlogic; import android.graphics.Color; import android.os.SystemClock; import android.text.SpannableString; import android.text.Spanned; import android.text.TextUtils; import android.text.style.BackgroundColorSpan; import android.text.style.SuggestionSpan; import android.util.Log; import android.view.KeyCharacterMap; import android.view.KeyEvent; import android.view.inputmethod.CorrectionInfo; import android.view.inputmethod.EditorInfo; import com.android.inputmethod.compat.SuggestionSpanUtils; import com.android.inputmethod.event.Event; import com.android.inputmethod.event.InputTransaction; import com.android.inputmethod.keyboard.Keyboard; import com.android.inputmethod.keyboard.KeyboardSwitcher; import com.android.inputmethod.latin.Dictionary; import com.android.inputmethod.latin.DictionaryFacilitator; import com.android.inputmethod.latin.LastComposedWord; import com.android.inputmethod.latin.LatinIME; import com.android.inputmethod.latin.NgramContext; import com.android.inputmethod.latin.RichInputConnection; import com.android.inputmethod.latin.Suggest; import com.android.inputmethod.latin.Suggest.OnGetSuggestedWordsCallback; import com.android.inputmethod.latin.SuggestedWords; import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo; import com.android.inputmethod.latin.WordComposer; import com.android.inputmethod.latin.common.Constants; import com.android.inputmethod.latin.common.InputPointers; import com.android.inputmethod.latin.common.StringUtils; import com.android.inputmethod.latin.define.DebugFlags; import com.android.inputmethod.latin.settings.SettingsValues; import com.android.inputmethod.latin.settings.SettingsValuesForSuggestion; import com.android.inputmethod.latin.settings.SpacingAndPunctuations; import com.android.inputmethod.latin.suggestions.SuggestionStripViewAccessor; import com.android.inputmethod.latin.utils.AsyncResultHolder; import com.android.inputmethod.latin.utils.InputTypeUtils; import com.android.inputmethod.latin.utils.RecapitalizeStatus; import com.android.inputmethod.latin.utils.StatsUtils; import com.android.inputmethod.latin.utils.TextRange; import java.util.ArrayList; import java.util.TreeSet; import java.util.concurrent.TimeUnit; import javax.annotation.Nonnull; /** * This class manages the input logic. */ public final class InputLogic { private static final String TAG = InputLogic.class.getSimpleName(); // TODO : Remove this member when we can. final LatinIME mLatinIME; private final SuggestionStripViewAccessor mSuggestionStripViewAccessor; // Never null. private InputLogicHandler mInputLogicHandler = InputLogicHandler.NULL_HANDLER; // TODO : make all these fields private as soon as possible. // Current space state of the input method. This can be any of the above constants. private int mSpaceState; // Never null public SuggestedWords mSuggestedWords = SuggestedWords.getEmptyInstance(); public final Suggest mSuggest; private final DictionaryFacilitator mDictionaryFacilitator; public LastComposedWord mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD; // This has package visibility so it can be accessed from InputLogicHandler. /* package */ final WordComposer mWordComposer; public final RichInputConnection mConnection; private final RecapitalizeStatus mRecapitalizeStatus = new RecapitalizeStatus(); private int mDeleteCount; private long mLastKeyTime; public final TreeSet mCurrentlyPressedHardwareKeys = new TreeSet<>(); // Keeps track of most recently inserted text (multi-character key) for reverting private String mEnteredText; // TODO: This boolean is persistent state and causes large side effects at unexpected times. // Find a way to remove it for readability. private boolean mIsAutoCorrectionIndicatorOn; private long mDoubleSpacePeriodCountdownStart; /** * Create a new instance of the input logic. * @param latinIME the instance of the parent LatinIME. We should remove this when we can. * @param suggestionStripViewAccessor an object to access the suggestion strip view. * @param dictionaryFacilitator facilitator for getting suggestions and updating user history * dictionary. */ public InputLogic(final LatinIME latinIME, final SuggestionStripViewAccessor suggestionStripViewAccessor, final DictionaryFacilitator dictionaryFacilitator) { mLatinIME = latinIME; mSuggestionStripViewAccessor = suggestionStripViewAccessor; mWordComposer = new WordComposer(); mConnection = new RichInputConnection(latinIME); mInputLogicHandler = InputLogicHandler.NULL_HANDLER; mSuggest = new Suggest(dictionaryFacilitator); mDictionaryFacilitator = dictionaryFacilitator; } /** * Initializes the input logic for input in an editor. * * Call this when input starts or restarts in some editor (typically, in onStartInputView). * * @param combiningSpec the combining spec string for this subtype * @param settingsValues the current settings values */ public void startInput(final String combiningSpec, final SettingsValues settingsValues) { mEnteredText = null; if (!mWordComposer.getTypedWord().isEmpty()) { // For messaging apps that offer send button, the IME does not get the opportunity // to capture the last word. This block should capture those uncommitted words. // The timestamp at which it is captured is not accurate but close enough. StatsUtils.onWordCommitUserTyped( mWordComposer.getTypedWord(), mWordComposer.isBatchMode()); } mWordComposer.restartCombining(combiningSpec); resetComposingState(true /* alsoResetLastComposedWord */); mDeleteCount = 0; mSpaceState = SpaceState.NONE; mRecapitalizeStatus.disable(); // Do not perform recapitalize until the cursor is moved once mCurrentlyPressedHardwareKeys.clear(); mSuggestedWords = SuggestedWords.getEmptyInstance(); // In some cases (namely, after rotation of the device) editorInfo.initialSelStart is lying // so we try using some heuristics to find out about these and fix them. mConnection.tryFixLyingCursorPosition(); cancelDoubleSpacePeriodCountdown(); if (InputLogicHandler.NULL_HANDLER == mInputLogicHandler) { mInputLogicHandler = new InputLogicHandler(mLatinIME, this); } else { mInputLogicHandler.reset(); } if (settingsValues.mShouldShowLxxSuggestionUi) { mConnection.requestCursorUpdates(true /* enableMonitor */, true /* requestImmediateCallback */); } } /** * Call this when the subtype changes. * @param combiningSpec the spec string for the combining rules * @param settingsValues the current settings values */ public void onSubtypeChanged(final String combiningSpec, final SettingsValues settingsValues) { finishInput(); startInput(combiningSpec, settingsValues); } /** * Call this when the orientation changes. * @param settingsValues the current values of the settings. */ public void onOrientationChange(final SettingsValues settingsValues) { // If !isComposingWord, #commitTyped() is a no-op, but still, it's better to avoid // the useless IPC of {begin,end}BatchEdit. if (mWordComposer.isComposingWord()) { mConnection.beginBatchEdit(); // If we had a composition in progress, we need to commit the word so that the // suggestionsSpan will be added. This will allow resuming on the same suggestions // after rotation is finished. commitTyped(settingsValues, LastComposedWord.NOT_A_SEPARATOR); mConnection.endBatchEdit(); } } /** * Clean up the input logic after input is finished. */ public void finishInput() { if (mWordComposer.isComposingWord()) { mConnection.finishComposingText(); StatsUtils.onWordCommitUserTyped( mWordComposer.getTypedWord(), mWordComposer.isBatchMode()); } resetComposingState(true /* alsoResetLastComposedWord */); mInputLogicHandler.reset(); } // Normally this class just gets out of scope after the process ends, but in unit tests, we // create several instances of LatinIME in the same process, which results in several // instances of InputLogic. This cleans up the associated handler so that tests don't leak // handlers. public void recycle() { final InputLogicHandler inputLogicHandler = mInputLogicHandler; mInputLogicHandler = InputLogicHandler.NULL_HANDLER; inputLogicHandler.destroy(); mDictionaryFacilitator.closeDictionaries(); } /** * React to a string input. * * This is triggered by keys that input many characters at once, like the ".com" key or * some additional keys for example. * * @param settingsValues the current values of the settings. * @param event the input event containing the data. * @return the complete transaction object */ public InputTransaction onTextInput(final SettingsValues settingsValues, final Event event, final int keyboardShiftMode, final LatinIME.UIHandler handler) { final String rawText = event.getTextToCommit().toString(); final InputTransaction inputTransaction = new InputTransaction(settingsValues, event, SystemClock.uptimeMillis(), mSpaceState, getActualCapsMode(settingsValues, keyboardShiftMode)); mConnection.beginBatchEdit(); if (mWordComposer.isComposingWord()) { commitCurrentAutoCorrection(settingsValues, rawText, handler); } else { resetComposingState(true /* alsoResetLastComposedWord */); } handler.postUpdateSuggestionStrip(SuggestedWords.INPUT_STYLE_TYPING); final String text = performSpecificTldProcessingOnTextInput(rawText); if (SpaceState.PHANTOM == mSpaceState) { insertAutomaticSpaceIfOptionsAndTextAllow(settingsValues); } mConnection.commitText(text, 1); StatsUtils.onWordCommitUserTyped(mEnteredText, mWordComposer.isBatchMode()); mConnection.endBatchEdit(); // Space state must be updated before calling updateShiftState mSpaceState = SpaceState.NONE; mEnteredText = text; inputTransaction.setDidAffectContents(); inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); return inputTransaction; } /** * A suggestion was picked from the suggestion strip. * @param settingsValues the current values of the settings. * @param suggestionInfo the suggestion info. * @param keyboardShiftState the shift state of the keyboard, as returned by * {@link com.android.inputmethod.keyboard.KeyboardSwitcher#getKeyboardShiftMode()} * @return the complete transaction object */ // Called from {@link SuggestionStripView} through the {@link SuggestionStripView#Listener} // interface public InputTransaction onPickSuggestionManually(final SettingsValues settingsValues, final SuggestedWordInfo suggestionInfo, final int keyboardShiftState, final int currentKeyboardScriptId, final LatinIME.UIHandler handler) { final SuggestedWords suggestedWords = mSuggestedWords; final String suggestion = suggestionInfo.mWord; // If this is a punctuation picked from the suggestion strip, pass it to onCodeInput if (suggestion.length() == 1 && suggestedWords.isPunctuationSuggestions()) { // We still want to log a suggestion click. StatsUtils.onPickSuggestionManually( mSuggestedWords, suggestionInfo, mDictionaryFacilitator); // Word separators are suggested before the user inputs something. // Rely on onCodeInput to do the complicated swapping/stripping logic consistently. final Event event = Event.createPunctuationSuggestionPickedEvent(suggestionInfo); return onCodeInput(settingsValues, event, keyboardShiftState, currentKeyboardScriptId, handler); } final Event event = Event.createSuggestionPickedEvent(suggestionInfo); final InputTransaction inputTransaction = new InputTransaction(settingsValues, event, SystemClock.uptimeMillis(), mSpaceState, keyboardShiftState); // Manual pick affects the contents of the editor, so we take note of this. It's important // for the sequence of language switching. inputTransaction.setDidAffectContents(); mConnection.beginBatchEdit(); if (SpaceState.PHANTOM == mSpaceState && suggestion.length() > 0 // In the batch input mode, a manually picked suggested word should just replace // the current batch input text and there is no need for a phantom space. && !mWordComposer.isBatchMode()) { final int firstChar = Character.codePointAt(suggestion, 0); if (!settingsValues.isWordSeparator(firstChar) || settingsValues.isUsuallyPrecededBySpace(firstChar)) { insertAutomaticSpaceIfOptionsAndTextAllow(settingsValues); } } // TODO: We should not need the following branch. We should be able to take the same // code path as for other kinds, use commitChosenWord, and do everything normally. We will // however need to reset the suggestion strip right away, because we know we can't take // the risk of calling commitCompletion twice because we don't know how the app will react. if (suggestionInfo.isKindOf(SuggestedWordInfo.KIND_APP_DEFINED)) { mSuggestedWords = SuggestedWords.getEmptyInstance(); mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); resetComposingState(true /* alsoResetLastComposedWord */); mConnection.commitCompletion(suggestionInfo.mApplicationSpecifiedCompletionInfo); mConnection.endBatchEdit(); return inputTransaction; } commitChosenWord(settingsValues, suggestion, LastComposedWord.COMMIT_TYPE_MANUAL_PICK, LastComposedWord.NOT_A_SEPARATOR); mConnection.endBatchEdit(); // Don't allow cancellation of manual pick mLastComposedWord.deactivate(); // Space state must be updated before calling updateShiftState mSpaceState = SpaceState.PHANTOM; inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); // If we're not showing the "Touch again to save", then update the suggestion strip. // That's going to be predictions (or punctuation suggestions), so INPUT_STYLE_NONE. handler.postUpdateSuggestionStrip(SuggestedWords.INPUT_STYLE_NONE); StatsUtils.onPickSuggestionManually( mSuggestedWords, suggestionInfo, mDictionaryFacilitator); StatsUtils.onWordCommitSuggestionPickedManually( suggestionInfo.mWord, mWordComposer.isBatchMode()); return inputTransaction; } /** * Consider an update to the cursor position. Evaluate whether this update has happened as * part of normal typing or whether it was an explicit cursor move by the user. In any case, * do the necessary adjustments. * @param oldSelStart old selection start * @param oldSelEnd old selection end * @param newSelStart new selection start * @param newSelEnd new selection end * @param settingsValues the current values of the settings. * @return whether the cursor has moved as a result of user interaction. */ public boolean onUpdateSelection(final int oldSelStart, final int oldSelEnd, final int newSelStart, final int newSelEnd, final SettingsValues settingsValues) { if (mConnection.isBelatedExpectedUpdate(oldSelStart, newSelStart, oldSelEnd, newSelEnd)) { return false; } // TODO: the following is probably better done in resetEntireInputState(). // it should only happen when the cursor moved, and the very purpose of the // test below is to narrow down whether this happened or not. Likewise with // the call to updateShiftState. // We set this to NONE because after a cursor move, we don't want the space // state-related special processing to kick in. mSpaceState = SpaceState.NONE; final boolean selectionChangedOrSafeToReset = oldSelStart != newSelStart || oldSelEnd != newSelEnd // selection changed || !mWordComposer.isComposingWord(); // safe to reset final boolean hasOrHadSelection = (oldSelStart != oldSelEnd || newSelStart != newSelEnd); final int moveAmount = newSelStart - oldSelStart; // As an added small gift from the framework, it happens upon rotation when there // is a selection that we get a wrong cursor position delivered to startInput() that // does not get reflected in the oldSel{Start,End} parameters to the next call to // onUpdateSelection. In this case, we may have set a composition, and when we're here // we realize we shouldn't have. In theory, in this case, selectionChangedOrSafeToReset // should be true, but that is if the framework had taken that wrong cursor position // into account, which means we have to reset the entire composing state whenever there // is or was a selection regardless of whether it changed or not. if (hasOrHadSelection || !settingsValues.needsToLookupSuggestions() || (selectionChangedOrSafeToReset && !mWordComposer.moveCursorByAndReturnIfInsideComposingWord(moveAmount))) { // If we are composing a word and moving the cursor, we would want to set a // suggestion span for recorrection to work correctly. Unfortunately, that // would involve the keyboard committing some new text, which would move the // cursor back to where it was. Latin IME could then fix the position of the cursor // again, but the asynchronous nature of the calls results in this wreaking havoc // with selection on double tap and the like. // Another option would be to send suggestions each time we set the composing // text, but that is probably too expensive to do, so we decided to leave things // as is. // Also, we're posting a resume suggestions message, and this will update the // suggestions strip in a few milliseconds, so if we cleared the suggestion strip here // we'd have the suggestion strip noticeably janky. To avoid that, we don't clear // it here, which means we'll keep outdated suggestions for a split second but the // visual result is better. resetEntireInputState(newSelStart, newSelEnd, false /* clearSuggestionStrip */); } else { // resetEntireInputState calls resetCachesUponCursorMove, but forcing the // composition to end. But in all cases where we don't reset the entire input // state, we still want to tell the rich input connection about the new cursor // position so that it can update its caches. mConnection.resetCachesUponCursorMoveAndReturnSuccess( newSelStart, newSelEnd, false /* shouldFinishComposition */); } // The cursor has been moved : we now accept to perform recapitalization mRecapitalizeStatus.enable(); // We moved the cursor. If we are touching a word, we need to resume suggestion. mLatinIME.mHandler.postResumeSuggestions(true /* shouldDelay */); // Stop the last recapitalization, if started. mRecapitalizeStatus.stop(); return true; } /** * React to a code input. It may be a code point to insert, or a symbolic value that influences * the keyboard behavior. * * Typically, this is called whenever a key is pressed on the software keyboard. This is not * the entry point for gesture input; see the onBatchInput* family of functions for this. * * @param settingsValues the current settings values. * @param event the event to handle. * @param keyboardShiftMode the current shift mode of the keyboard, as returned by * {@link com.android.inputmethod.keyboard.KeyboardSwitcher#getKeyboardShiftMode()} * @return the complete transaction object */ public InputTransaction onCodeInput(final SettingsValues settingsValues, @Nonnull final Event event, final int keyboardShiftMode, final int currentKeyboardScriptId, final LatinIME.UIHandler handler) { final Event processedEvent = mWordComposer.processEvent(event); final InputTransaction inputTransaction = new InputTransaction(settingsValues, processedEvent, SystemClock.uptimeMillis(), mSpaceState, getActualCapsMode(settingsValues, keyboardShiftMode)); if (processedEvent.mKeyCode != Constants.CODE_DELETE || inputTransaction.mTimestamp > mLastKeyTime + Constants.LONG_PRESS_MILLISECONDS) { mDeleteCount = 0; } mLastKeyTime = inputTransaction.mTimestamp; mConnection.beginBatchEdit(); if (!mWordComposer.isComposingWord()) { // TODO: is this useful? It doesn't look like it should be done here, but rather after // a word is committed. mIsAutoCorrectionIndicatorOn = false; } // TODO: Consolidate the double-space period timer, mLastKeyTime, and the space state. if (processedEvent.mCodePoint != Constants.CODE_SPACE) { cancelDoubleSpacePeriodCountdown(); } Event currentEvent = processedEvent; while (null != currentEvent) { if (currentEvent.isConsumed()) { handleConsumedEvent(currentEvent, inputTransaction); } else if (currentEvent.isFunctionalKeyEvent()) { handleFunctionalEvent(currentEvent, inputTransaction, currentKeyboardScriptId, handler); } else { handleNonFunctionalEvent(currentEvent, inputTransaction, handler); } currentEvent = currentEvent.mNextEvent; } if (!inputTransaction.didAutoCorrect() && processedEvent.mKeyCode != Constants.CODE_SHIFT && processedEvent.mKeyCode != Constants.CODE_CAPSLOCK && processedEvent.mKeyCode != Constants.CODE_SWITCH_ALPHA_SYMBOL) mLastComposedWord.deactivate(); if (Constants.CODE_DELETE != processedEvent.mKeyCode) { mEnteredText = null; } mConnection.endBatchEdit(); return inputTransaction; } public void onStartBatchInput(final SettingsValues settingsValues, final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) { mInputLogicHandler.onStartBatchInput(); handler.showGesturePreviewAndSuggestionStrip( SuggestedWords.getEmptyInstance(), false /* dismissGestureFloatingPreviewText */); handler.cancelUpdateSuggestionStrip(); ++mAutoCommitSequenceNumber; mConnection.beginBatchEdit(); if (mWordComposer.isComposingWord()) { if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) { // If we are in the middle of a recorrection, we need to commit the recorrection // first so that we can insert the batch input at the current cursor position. resetEntireInputState(mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd(), true /* clearSuggestionStrip */); } else if (mWordComposer.isSingleLetter()) { // We auto-correct the previous (typed, not gestured) string iff it's one character // long. The reason for this is, even in the middle of gesture typing, you'll still // tap one-letter words and you want them auto-corrected (typically, "i" in English // should become "I"). However for any longer word, we assume that the reason for // tapping probably is that the word you intend to type is not in the dictionary, // so we do not attempt to correct, on the assumption that if that was a dictionary // word, the user would probably have gestured instead. commitCurrentAutoCorrection(settingsValues, LastComposedWord.NOT_A_SEPARATOR, handler); } else { commitTyped(settingsValues, LastComposedWord.NOT_A_SEPARATOR); } } final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor(); if (Character.isLetterOrDigit(codePointBeforeCursor) || settingsValues.isUsuallyFollowedBySpace(codePointBeforeCursor)) { final boolean autoShiftHasBeenOverriden = keyboardSwitcher.getKeyboardShiftMode() != getCurrentAutoCapsState(settingsValues); mSpaceState = SpaceState.PHANTOM; if (!autoShiftHasBeenOverriden) { // When we change the space state, we need to update the shift state of the // keyboard unless it has been overridden manually. This is happening for example // after typing some letters and a period, then gesturing; the keyboard is not in // caps mode yet, but since a gesture is starting, it should go in caps mode, // unless the user explictly said it should not. keyboardSwitcher.requestUpdatingShiftState(getCurrentAutoCapsState(settingsValues), getCurrentRecapitalizeState()); } } mConnection.endBatchEdit(); mWordComposer.setCapitalizedModeAtStartComposingTime( getActualCapsMode(settingsValues, keyboardSwitcher.getKeyboardShiftMode())); } /* The sequence number member is only used in onUpdateBatchInput. It is increased each time * auto-commit happens. The reason we need this is, when auto-commit happens we trim the * input pointers that are held in a singleton, and to know how much to trim we rely on the * results of the suggestion process that is held in mSuggestedWords. * However, the suggestion process is asynchronous, and sometimes we may enter the * onUpdateBatchInput method twice without having recomputed suggestions yet, or having * received new suggestions generated from not-yet-trimmed input pointers. In this case, the * mIndexOfTouchPointOfSecondWords member will be out of date, and we must not use it lest we * remove an unrelated number of pointers (possibly even more than are left in the input * pointers, leading to a crash). * To avoid that, we increase the sequence number each time we auto-commit and trim the * input pointers, and we do not use any suggested words that have been generated with an * earlier sequence number. */ private int mAutoCommitSequenceNumber = 1; public void onUpdateBatchInput(final InputPointers batchPointers) { mInputLogicHandler.onUpdateBatchInput(batchPointers, mAutoCommitSequenceNumber); } public void onEndBatchInput(final InputPointers batchPointers) { mInputLogicHandler.updateTailBatchInput(batchPointers, mAutoCommitSequenceNumber); ++mAutoCommitSequenceNumber; } public void onCancelBatchInput(final LatinIME.UIHandler handler) { mInputLogicHandler.onCancelBatchInput(); handler.showGesturePreviewAndSuggestionStrip( SuggestedWords.getEmptyInstance(), true /* dismissGestureFloatingPreviewText */); } // TODO: on the long term, this method should become private, but it will be difficult. // Especially, how do we deal with InputMethodService.onDisplayCompletions? public void setSuggestedWords(final SuggestedWords suggestedWords) { if (!suggestedWords.isEmpty()) { final SuggestedWordInfo suggestedWordInfo; if (suggestedWords.mWillAutoCorrect) { suggestedWordInfo = suggestedWords.getInfo(SuggestedWords.INDEX_OF_AUTO_CORRECTION); } else { // We can't use suggestedWords.getWord(SuggestedWords.INDEX_OF_TYPED_WORD) // because it may differ from mWordComposer.mTypedWord. suggestedWordInfo = suggestedWords.mTypedWordInfo; } mWordComposer.setAutoCorrection(suggestedWordInfo); } mSuggestedWords = suggestedWords; final boolean newAutoCorrectionIndicator = suggestedWords.mWillAutoCorrect; // Put a blue underline to a word in TextView which will be auto-corrected. if (mIsAutoCorrectionIndicatorOn != newAutoCorrectionIndicator && mWordComposer.isComposingWord()) { mIsAutoCorrectionIndicatorOn = newAutoCorrectionIndicator; final CharSequence textWithUnderline = getTextWithUnderline(mWordComposer.getTypedWord()); // TODO: when called from an updateSuggestionStrip() call that results from a posted // message, this is called outside any batch edit. Potentially, this may result in some // janky flickering of the screen, although the display speed makes it unlikely in // the practice. setComposingTextInternal(textWithUnderline, 1); } } /** * Handle a consumed event. * * Consumed events represent events that have already been consumed, typically by the * combining chain. * * @param event The event to handle. * @param inputTransaction The transaction in progress. */ private void handleConsumedEvent(final Event event, final InputTransaction inputTransaction) { // A consumed event may have text to commit and an update to the composing state, so // we evaluate both. With some combiners, it's possible than an event contains both // and we enter both of the following if clauses. final CharSequence textToCommit = event.getTextToCommit(); if (!TextUtils.isEmpty(textToCommit)) { mConnection.commitText(textToCommit, 1); inputTransaction.setDidAffectContents(); } if (mWordComposer.isComposingWord()) { setComposingTextInternal(mWordComposer.getTypedWord(), 1); inputTransaction.setDidAffectContents(); inputTransaction.setRequiresUpdateSuggestions(); } } /** * Handle a functional key event. * * A functional event is a special key, like delete, shift, emoji, or the settings key. * Non-special keys are those that generate a single code point. * This includes all letters, digits, punctuation, separators, emoji. It excludes keys that * manage keyboard-related stuff like shift, language switch, settings, layout switch, or * any key that results in multiple code points like the ".com" key. * * @param event The event to handle. * @param inputTransaction The transaction in progress. */ private void handleFunctionalEvent(final Event event, final InputTransaction inputTransaction, final int currentKeyboardScriptId, final LatinIME.UIHandler handler) { switch (event.mKeyCode) { case Constants.CODE_DELETE: handleBackspaceEvent(event, inputTransaction, currentKeyboardScriptId); // Backspace is a functional key, but it affects the contents of the editor. inputTransaction.setDidAffectContents(); break; case Constants.CODE_SHIFT: performRecapitalization(inputTransaction.mSettingsValues); inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); if (mSuggestedWords.isPrediction()) { inputTransaction.setRequiresUpdateSuggestions(); } break; case Constants.CODE_CAPSLOCK: // Note: Changing keyboard to shift lock state is handled in // {@link KeyboardSwitcher#onEvent(Event)}. break; case Constants.CODE_SYMBOL_SHIFT: // Note: Calling back to the keyboard on the symbol Shift key is handled in // {@link #onPressKey(int,int,boolean)} and {@link #onReleaseKey(int,boolean)}. break; case Constants.CODE_SWITCH_ALPHA_SYMBOL: // Note: Calling back to the keyboard on symbol key is handled in // {@link #onPressKey(int,int,boolean)} and {@link #onReleaseKey(int,boolean)}. break; case Constants.CODE_SETTINGS: onSettingsKeyPressed(); break; case Constants.CODE_SHORTCUT: // We need to switch to the shortcut IME. This is handled by LatinIME since the // input logic has no business with IME switching. break; case Constants.CODE_ACTION_NEXT: performEditorAction(EditorInfo.IME_ACTION_NEXT); break; case Constants.CODE_ACTION_PREVIOUS: performEditorAction(EditorInfo.IME_ACTION_PREVIOUS); break; case Constants.CODE_LANGUAGE_SWITCH: handleLanguageSwitchKey(); break; case Constants.CODE_EMOJI: // Note: Switching emoji keyboard is being handled in // {@link KeyboardState#onEvent(Event,int)}. break; case Constants.CODE_ALPHA_FROM_EMOJI: // Note: Switching back from Emoji keyboard to the main keyboard is being // handled in {@link KeyboardState#onEvent(Event,int)}. break; case Constants.CODE_SHIFT_ENTER: final Event tmpEvent = Event.createSoftwareKeypressEvent(Constants.CODE_ENTER, event.mKeyCode, event.mX, event.mY, event.isKeyRepeat()); handleNonSpecialCharacterEvent(tmpEvent, inputTransaction, handler); // Shift + Enter is treated as a functional key but it results in adding a new // line, so that does affect the contents of the editor. inputTransaction.setDidAffectContents(); break; default: throw new RuntimeException("Unknown key code : " + event.mKeyCode); } } /** * Handle an event that is not a functional event. * * These events are generally events that cause input, but in some cases they may do other * things like trigger an editor action. * * @param event The event to handle. * @param inputTransaction The transaction in progress. */ private void handleNonFunctionalEvent(final Event event, final InputTransaction inputTransaction, final LatinIME.UIHandler handler) { inputTransaction.setDidAffectContents(); switch (event.mCodePoint) { case Constants.CODE_ENTER: final EditorInfo editorInfo = getCurrentInputEditorInfo(); final int imeOptionsActionId = InputTypeUtils.getImeOptionsActionIdFromEditorInfo(editorInfo); if (InputTypeUtils.IME_ACTION_CUSTOM_LABEL == imeOptionsActionId) { // Either we have an actionLabel and we should performEditorAction with // actionId regardless of its value. performEditorAction(editorInfo.actionId); } else if (EditorInfo.IME_ACTION_NONE != imeOptionsActionId) { // We didn't have an actionLabel, but we had another action to execute. // EditorInfo.IME_ACTION_NONE explicitly means no action. In contrast, // EditorInfo.IME_ACTION_UNSPECIFIED is the default value for an action, so it // means there should be an action and the app didn't bother to set a specific // code for it - presumably it only handles one. It does not have to be treated // in any specific way: anything that is not IME_ACTION_NONE should be sent to // performEditorAction. performEditorAction(imeOptionsActionId); } else { // No action label, and the action from imeOptions is NONE: this is a regular // enter key that should input a carriage return. handleNonSpecialCharacterEvent(event, inputTransaction, handler); } break; default: handleNonSpecialCharacterEvent(event, inputTransaction, handler); break; } } /** * Handle inputting a code point to the editor. * * Non-special keys are those that generate a single code point. * This includes all letters, digits, punctuation, separators, emoji. It excludes keys that * manage keyboard-related stuff like shift, language switch, settings, layout switch, or * any key that results in multiple code points like the ".com" key. * * @param event The event to handle. * @param inputTransaction The transaction in progress. */ private void handleNonSpecialCharacterEvent(final Event event, final InputTransaction inputTransaction, final LatinIME.UIHandler handler) { final int codePoint = event.mCodePoint; mSpaceState = SpaceState.NONE; if (inputTransaction.mSettingsValues.isWordSeparator(codePoint) || Character.getType(codePoint) == Character.OTHER_SYMBOL) { handleSeparatorEvent(event, inputTransaction, handler); } else { if (SpaceState.PHANTOM == inputTransaction.mSpaceState) { if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) { // If we are in the middle of a recorrection, we need to commit the recorrection // first so that we can insert the character at the current cursor position. resetEntireInputState(mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd(), true /* clearSuggestionStrip */); } else { commitTyped(inputTransaction.mSettingsValues, LastComposedWord.NOT_A_SEPARATOR); } } handleNonSeparatorEvent(event, inputTransaction.mSettingsValues, inputTransaction); } } /** * Handle a non-separator. * @param event The event to handle. * @param settingsValues The current settings values. * @param inputTransaction The transaction in progress. */ private void handleNonSeparatorEvent(final Event event, final SettingsValues settingsValues, final InputTransaction inputTransaction) { final int codePoint = event.mCodePoint; // TODO: refactor this method to stop flipping isComposingWord around all the time, and // make it shorter (possibly cut into several pieces). Also factor // handleNonSpecialCharacterEvent which has the same name as other handle* methods but is // not the same. boolean isComposingWord = mWordComposer.isComposingWord(); // TODO: remove isWordConnector() and use isUsuallyFollowedBySpace() instead. // See onStartBatchInput() to see how to do it. if (SpaceState.PHANTOM == inputTransaction.mSpaceState && !settingsValues.isWordConnector(codePoint)) { if (isComposingWord) { // Sanity check throw new RuntimeException("Should not be composing here"); } insertAutomaticSpaceIfOptionsAndTextAllow(settingsValues); } if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) { // If we are in the middle of a recorrection, we need to commit the recorrection // first so that we can insert the character at the current cursor position. resetEntireInputState(mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd(), true /* clearSuggestionStrip */); isComposingWord = false; } // We want to find out whether to start composing a new word with this character. If so, // we need to reset the composing state and switch isComposingWord. The order of the // tests is important for good performance. // We only start composing if we're not already composing. if (!isComposingWord // We only start composing if this is a word code point. Essentially that means it's a // a letter or a word connector. && settingsValues.isWordCodePoint(codePoint) // We never go into composing state if suggestions are not requested. && settingsValues.needsToLookupSuggestions() && // In languages with spaces, we only start composing a word when we are not already // touching a word. In languages without spaces, the above conditions are sufficient. (!mConnection.isCursorTouchingWord(settingsValues.mSpacingAndPunctuations) || !settingsValues.mSpacingAndPunctuations.mCurrentLanguageHasSpaces)) { // Reset entirely the composing state anyway, then start composing a new word unless // the character is a word connector. The idea here is, word connectors are not // separators and they should be treated as normal characters, except in the first // position where they should not start composing a word. isComposingWord = !settingsValues.mSpacingAndPunctuations.isWordConnector(codePoint); // Here we don't need to reset the last composed word. It will be reset // when we commit this one, if we ever do; if on the other hand we backspace // it entirely and resume suggestions on the previous word, we'd like to still // have touch coordinates for it. resetComposingState(false /* alsoResetLastComposedWord */); } if (isComposingWord) { mWordComposer.applyProcessedEvent(event); // If it's the first letter, make note of auto-caps state if (mWordComposer.isSingleLetter()) { mWordComposer.setCapitalizedModeAtStartComposingTime(inputTransaction.mShiftState); } setComposingTextInternal(getTextWithUnderline(mWordComposer.getTypedWord()), 1); } else { final boolean swapWeakSpace = tryStripSpaceAndReturnWhetherShouldSwapInstead(event, inputTransaction); if (swapWeakSpace && trySwapSwapperAndSpace(event, inputTransaction)) { mSpaceState = SpaceState.WEAK; } else { sendKeyCodePoint(settingsValues, codePoint); } } inputTransaction.setRequiresUpdateSuggestions(); } /** * Handle input of a separator code point. * @param event The event to handle. * @param inputTransaction The transaction in progress. */ private void handleSeparatorEvent(final Event event, final InputTransaction inputTransaction, final LatinIME.UIHandler handler) { final int codePoint = event.mCodePoint; final SettingsValues settingsValues = inputTransaction.mSettingsValues; final boolean wasComposingWord = mWordComposer.isComposingWord(); // We avoid sending spaces in languages without spaces if we were composing. final boolean shouldAvoidSendingCode = Constants.CODE_SPACE == codePoint && !settingsValues.mSpacingAndPunctuations.mCurrentLanguageHasSpaces && wasComposingWord; if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) { // If we are in the middle of a recorrection, we need to commit the recorrection // first so that we can insert the separator at the current cursor position. resetEntireInputState(mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd(), true /* clearSuggestionStrip */); } // isComposingWord() may have changed since we stored wasComposing if (mWordComposer.isComposingWord()) { if (settingsValues.mAutoCorrectionEnabledPerUserSettings) { final String separator = shouldAvoidSendingCode ? LastComposedWord.NOT_A_SEPARATOR : StringUtils.newSingleCodePointString(codePoint); commitCurrentAutoCorrection(settingsValues, separator, handler); inputTransaction.setDidAutoCorrect(); } else { commitTyped(settingsValues, StringUtils.newSingleCodePointString(codePoint)); } } final boolean swapWeakSpace = tryStripSpaceAndReturnWhetherShouldSwapInstead(event, inputTransaction); final boolean isInsideDoubleQuoteOrAfterDigit = Constants.CODE_DOUBLE_QUOTE == codePoint && mConnection.isInsideDoubleQuoteOrAfterDigit(); final boolean needsPrecedingSpace; if (SpaceState.PHANTOM != inputTransaction.mSpaceState) { needsPrecedingSpace = false; } else if (Constants.CODE_DOUBLE_QUOTE == codePoint) { // Double quotes behave like they are usually preceded by space iff we are // not inside a double quote or after a digit. needsPrecedingSpace = !isInsideDoubleQuoteOrAfterDigit; } else if (settingsValues.mSpacingAndPunctuations.isClusteringSymbol(codePoint) && settingsValues.mSpacingAndPunctuations.isClusteringSymbol( mConnection.getCodePointBeforeCursor())) { needsPrecedingSpace = false; } else { needsPrecedingSpace = settingsValues.isUsuallyPrecededBySpace(codePoint); } if (needsPrecedingSpace) { insertAutomaticSpaceIfOptionsAndTextAllow(settingsValues); } if (tryPerformDoubleSpacePeriod(event, inputTransaction)) { mSpaceState = SpaceState.DOUBLE; inputTransaction.setRequiresUpdateSuggestions(); StatsUtils.onDoubleSpacePeriod(); } else if (swapWeakSpace && trySwapSwapperAndSpace(event, inputTransaction)) { mSpaceState = SpaceState.SWAP_PUNCTUATION; mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); } else if (Constants.CODE_SPACE == codePoint) { if (!mSuggestedWords.isPunctuationSuggestions()) { mSpaceState = SpaceState.WEAK; } startDoubleSpacePeriodCountdown(inputTransaction); if (wasComposingWord || mSuggestedWords.isEmpty()) { inputTransaction.setRequiresUpdateSuggestions(); } if (!shouldAvoidSendingCode) { sendKeyCodePoint(settingsValues, codePoint); } } else { if ((SpaceState.PHANTOM == inputTransaction.mSpaceState && settingsValues.isUsuallyFollowedBySpace(codePoint)) || (Constants.CODE_DOUBLE_QUOTE == codePoint && isInsideDoubleQuoteOrAfterDigit)) { // If we are in phantom space state, and the user presses a separator, we want to // stay in phantom space state so that the next keypress has a chance to add the // space. For example, if I type "Good dat", pick "day" from the suggestion strip // then insert a comma and go on to typing the next word, I want the space to be // inserted automatically before the next word, the same way it is when I don't // input the comma. A double quote behaves like it's usually followed by space if // we're inside a double quote. // The case is a little different if the separator is a space stripper. Such a // separator does not normally need a space on the right (that's the difference // between swappers and strippers), so we should not stay in phantom space state if // the separator is a stripper. Hence the additional test above. mSpaceState = SpaceState.PHANTOM; } sendKeyCodePoint(settingsValues, codePoint); // Set punctuation right away. onUpdateSelection will fire but tests whether it is // already displayed or not, so it's okay. mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); } inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); } /** * Handle a press on the backspace key. * @param event The event to handle. * @param inputTransaction The transaction in progress. */ private void handleBackspaceEvent(final Event event, final InputTransaction inputTransaction, final int currentKeyboardScriptId) { mSpaceState = SpaceState.NONE; mDeleteCount++; // In many cases after backspace, we need to update the shift state. Normally we need // to do this right away to avoid the shift state being out of date in case the user types // backspace then some other character very fast. However, in the case of backspace key // repeat, this can lead to flashiness when the cursor flies over positions where the // shift state should be updated, so if this is a key repeat, we update after a small delay. // Then again, even in the case of a key repeat, if the cursor is at start of text, it // can't go any further back, so we can update right away even if it's a key repeat. final int shiftUpdateKind = event.isKeyRepeat() && mConnection.getExpectedSelectionStart() > 0 ? InputTransaction.SHIFT_UPDATE_LATER : InputTransaction.SHIFT_UPDATE_NOW; inputTransaction.requireShiftUpdate(shiftUpdateKind); if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) { // If we are in the middle of a recorrection, we need to commit the recorrection // first so that we can remove the character at the current cursor position. resetEntireInputState(mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd(), true /* clearSuggestionStrip */); // When we exit this if-clause, mWordComposer.isComposingWord() will return false. } if (mWordComposer.isComposingWord()) { if (mWordComposer.isBatchMode()) { final String rejectedSuggestion = mWordComposer.getTypedWord(); mWordComposer.reset(); mWordComposer.setRejectedBatchModeSuggestion(rejectedSuggestion); if (!TextUtils.isEmpty(rejectedSuggestion)) { unlearnWord(rejectedSuggestion, inputTransaction.mSettingsValues, Constants.EVENT_REJECTION); } StatsUtils.onBackspaceWordDelete(rejectedSuggestion.length()); } else { mWordComposer.applyProcessedEvent(event); StatsUtils.onBackspacePressed(1); } if (mWordComposer.isComposingWord()) { setComposingTextInternal(getTextWithUnderline(mWordComposer.getTypedWord()), 1); } else { mConnection.commitText("", 1); } inputTransaction.setRequiresUpdateSuggestions(); } else { if (mLastComposedWord.canRevertCommit()) { final String lastComposedWord = mLastComposedWord.mTypedWord; revertCommit(inputTransaction, inputTransaction.mSettingsValues); StatsUtils.onRevertAutoCorrect(); StatsUtils.onWordCommitUserTyped(lastComposedWord, mWordComposer.isBatchMode()); // Restart suggestions when backspacing into a reverted word. This is required for // the final corrected word to be learned, as learning only occurs when suggestions // are active. // // Note: restartSuggestionsOnWordTouchedByCursor is already called for normal // (non-revert) backspace handling. if (inputTransaction.mSettingsValues.isSuggestionsEnabledPerUserSettings() && inputTransaction.mSettingsValues.mSpacingAndPunctuations .mCurrentLanguageHasSpaces && !mConnection.isCursorFollowedByWordCharacter( inputTransaction.mSettingsValues.mSpacingAndPunctuations)) { restartSuggestionsOnWordTouchedByCursor(inputTransaction.mSettingsValues, false /* forStartInput */, currentKeyboardScriptId); } return; } if (mEnteredText != null && mConnection.sameAsTextBeforeCursor(mEnteredText)) { // Cancel multi-character input: remove the text we just entered. // This is triggered on backspace after a key that inputs multiple characters, // like the smiley key or the .com key. mConnection.deleteSurroundingText(mEnteredText.length(), 0); StatsUtils.onDeleteMultiCharInput(mEnteredText.length()); mEnteredText = null; // If we have mEnteredText, then we know that mHasUncommittedTypedChars == false. // In addition we know that spaceState is false, and that we should not be // reverting any autocorrect at this point. So we can safely return. return; } if (SpaceState.DOUBLE == inputTransaction.mSpaceState) { cancelDoubleSpacePeriodCountdown(); if (mConnection.revertDoubleSpacePeriod( inputTransaction.mSettingsValues.mSpacingAndPunctuations)) { // No need to reset mSpaceState, it has already be done (that's why we // receive it as a parameter) inputTransaction.setRequiresUpdateSuggestions(); mWordComposer.setCapitalizedModeAtStartComposingTime( WordComposer.CAPS_MODE_OFF); StatsUtils.onRevertDoubleSpacePeriod(); return; } } else if (SpaceState.SWAP_PUNCTUATION == inputTransaction.mSpaceState) { if (mConnection.revertSwapPunctuation()) { StatsUtils.onRevertSwapPunctuation(); // Likewise return; } } boolean hasUnlearnedWordBeingDeleted = false; // No cancelling of commit/double space/swap: we have a regular backspace. // We should backspace one char and restart suggestion if at the end of a word. if (mConnection.hasSelection()) { // If there is a selection, remove it. final int numCharsDeleted = mConnection.getExpectedSelectionEnd() - mConnection.getExpectedSelectionStart(); mConnection.setSelection(mConnection.getExpectedSelectionEnd(), mConnection.getExpectedSelectionEnd()); mConnection.deleteSurroundingText(numCharsDeleted, 0); StatsUtils.onBackspaceSelectedText(numCharsDeleted); } else { // There is no selection, just delete one character. if (inputTransaction.mSettingsValues.isBeforeJellyBean() || inputTransaction.mSettingsValues.mInputAttributes.isTypeNull() || Constants.NOT_A_CURSOR_POSITION == mConnection.getExpectedSelectionEnd()) { // There are three possible reasons to send a key event: either the field has // type TYPE_NULL, in which case the keyboard should send events, or we are // running in backward compatibility mode, or we don't know the cursor position. // Before Jelly bean, the keyboard would simulate a hardware keyboard event on // pressing enter or delete. This is bad for many reasons (there are race // conditions with commits) but some applications are relying on this behavior // so we continue to support it for older apps, so we retain this behavior if // the app has target SDK < JellyBean. // As for the case where we don't know the cursor position, it can happen // because of bugs in the framework. But the framework should know, so the next // best thing is to leave it to whatever it thinks is best. sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL); int totalDeletedLength = 1; if (mDeleteCount > Constants.DELETE_ACCELERATE_AT) { // If this is an accelerated (i.e., double) deletion, then we need to // consider unlearning here because we may have already reached // the previous word, and will lose it after next deletion. hasUnlearnedWordBeingDeleted |= unlearnWordBeingDeleted( inputTransaction.mSettingsValues, currentKeyboardScriptId); sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL); totalDeletedLength++; } StatsUtils.onBackspacePressed(totalDeletedLength); } else { final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor(); if (codePointBeforeCursor == Constants.NOT_A_CODE) { // HACK for backward compatibility with broken apps that haven't realized // yet that hardware keyboards are not the only way of inputting text. // Nothing to delete before the cursor. We should not do anything, but many // broken apps expect something to happen in this case so that they can // catch it and have their broken interface react. If you need the keyboard // to do this, you're doing it wrong -- please fix your app. mConnection.deleteSurroundingText(1, 0); // TODO: Add a new StatsUtils method onBackspaceWhenNoText() return; } final int lengthToDelete = Character.isSupplementaryCodePoint(codePointBeforeCursor) ? 2 : 1; mConnection.deleteSurroundingText(lengthToDelete, 0); int totalDeletedLength = lengthToDelete; if (mDeleteCount > Constants.DELETE_ACCELERATE_AT) { // If this is an accelerated (i.e., double) deletion, then we need to // consider unlearning here because we may have already reached // the previous word, and will lose it after next deletion. hasUnlearnedWordBeingDeleted |= unlearnWordBeingDeleted( inputTransaction.mSettingsValues, currentKeyboardScriptId); final int codePointBeforeCursorToDeleteAgain = mConnection.getCodePointBeforeCursor(); if (codePointBeforeCursorToDeleteAgain != Constants.NOT_A_CODE) { final int lengthToDeleteAgain = Character.isSupplementaryCodePoint( codePointBeforeCursorToDeleteAgain) ? 2 : 1; mConnection.deleteSurroundingText(lengthToDeleteAgain, 0); totalDeletedLength += lengthToDeleteAgain; } } StatsUtils.onBackspacePressed(totalDeletedLength); } } if (!hasUnlearnedWordBeingDeleted) { // Consider unlearning the word being deleted (if we have not done so already). unlearnWordBeingDeleted( inputTransaction.mSettingsValues, currentKeyboardScriptId); } if (inputTransaction.mSettingsValues.isSuggestionsEnabledPerUserSettings() && inputTransaction.mSettingsValues.mSpacingAndPunctuations .mCurrentLanguageHasSpaces && !mConnection.isCursorFollowedByWordCharacter( inputTransaction.mSettingsValues.mSpacingAndPunctuations)) { restartSuggestionsOnWordTouchedByCursor(inputTransaction.mSettingsValues, false /* forStartInput */, currentKeyboardScriptId); } } } boolean unlearnWordBeingDeleted( final SettingsValues settingsValues,final int currentKeyboardScriptId) { // If we just started backspacing to delete a previous word (but have not // entered the composing state yet), unlearn the word. // TODO: Consider tracking whether or not this word was typed by the user. if (!mConnection.hasSelection() && settingsValues.isSuggestionsEnabledPerUserSettings() && settingsValues.mSpacingAndPunctuations.mCurrentLanguageHasSpaces && !mConnection.isCursorFollowedByWordCharacter( settingsValues.mSpacingAndPunctuations)) { final TextRange range = mConnection.getWordRangeAtCursor( settingsValues.mSpacingAndPunctuations, currentKeyboardScriptId); if (range == null) { // Happens if we don't have an input connection at all. return false; } final String wordBeingDeleted = range.mWord.toString(); if (!wordBeingDeleted.isEmpty()) { unlearnWord(wordBeingDeleted, settingsValues, Constants.EVENT_BACKSPACE); return true; } } return false; } void unlearnWord(final String word, final SettingsValues settingsValues, final int eventType) { final NgramContext ngramContext = mConnection.getNgramContextFromNthPreviousWord( settingsValues.mSpacingAndPunctuations, 2); final long timeStampInSeconds = TimeUnit.MILLISECONDS.toSeconds( System.currentTimeMillis()); mDictionaryFacilitator.unlearnFromUserHistory( word, ngramContext, timeStampInSeconds, eventType); } /** * Handle a press on the language switch key (the "globe key") */ private void handleLanguageSwitchKey() { mLatinIME.switchToNextSubtype(); } /** * Swap a space with a space-swapping punctuation sign. * * This method will check that there are two characters before the cursor and that the first * one is a space before it does the actual swapping. * @param event The event to handle. * @param inputTransaction The transaction in progress. * @return true if the swap has been performed, false if it was prevented by preliminary checks. */ private boolean trySwapSwapperAndSpace(final Event event, final InputTransaction inputTransaction) { final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor(); if (Constants.CODE_SPACE != codePointBeforeCursor) { return false; } mConnection.deleteSurroundingText(1, 0); final String text = event.getTextToCommit() + " "; mConnection.commitText(text, 1); inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); return true; } /* * Strip a trailing space if necessary and returns whether it's a swap weak space situation. * @param event The event to handle. * @param inputTransaction The transaction in progress. * @return whether we should swap the space instead of removing it. */ private boolean tryStripSpaceAndReturnWhetherShouldSwapInstead(final Event event, final InputTransaction inputTransaction) { final int codePoint = event.mCodePoint; final boolean isFromSuggestionStrip = event.isSuggestionStripPress(); if (Constants.CODE_ENTER == codePoint && SpaceState.SWAP_PUNCTUATION == inputTransaction.mSpaceState) { mConnection.removeTrailingSpace(); return false; } if ((SpaceState.WEAK == inputTransaction.mSpaceState || SpaceState.SWAP_PUNCTUATION == inputTransaction.mSpaceState) && isFromSuggestionStrip) { if (inputTransaction.mSettingsValues.isUsuallyPrecededBySpace(codePoint)) { return false; } if (inputTransaction.mSettingsValues.isUsuallyFollowedBySpace(codePoint)) { return true; } mConnection.removeTrailingSpace(); } return false; } public void startDoubleSpacePeriodCountdown(final InputTransaction inputTransaction) { mDoubleSpacePeriodCountdownStart = inputTransaction.mTimestamp; } public void cancelDoubleSpacePeriodCountdown() { mDoubleSpacePeriodCountdownStart = 0; } public boolean isDoubleSpacePeriodCountdownActive(final InputTransaction inputTransaction) { return inputTransaction.mTimestamp - mDoubleSpacePeriodCountdownStart < inputTransaction.mSettingsValues.mDoubleSpacePeriodTimeout; } /** * Apply the double-space-to-period transformation if applicable. * * The double-space-to-period transformation means that we replace two spaces with a * period-space sequence of characters. This typically happens when the user presses space * twice in a row quickly. * This method will check that the double-space-to-period is active in settings, that the * two spaces have been input close enough together, that the typed character is a space * and that the previous character allows for the transformation to take place. If all of * these conditions are fulfilled, this method applies the transformation and returns true. * Otherwise, it does nothing and returns false. * * @param event The event to handle. * @param inputTransaction The transaction in progress. * @return true if we applied the double-space-to-period transformation, false otherwise. */ private boolean tryPerformDoubleSpacePeriod(final Event event, final InputTransaction inputTransaction) { // Check the setting, the typed character and the countdown. If any of the conditions is // not fulfilled, return false. if (!inputTransaction.mSettingsValues.mUseDoubleSpacePeriod || Constants.CODE_SPACE != event.mCodePoint || !isDoubleSpacePeriodCountdownActive(inputTransaction)) { return false; } // We only do this when we see one space and an accepted code point before the cursor. // The code point may be a surrogate pair but the space may not, so we need 3 chars. final CharSequence lastTwo = mConnection.getTextBeforeCursor(3, 0); if (null == lastTwo) return false; final int length = lastTwo.length(); if (length < 2) return false; if (lastTwo.charAt(length - 1) != Constants.CODE_SPACE) { return false; } // We know there is a space in pos -1, and we have at least two chars. If we have only two // chars, isSurrogatePairs can't return true as charAt(1) is a space, so this is fine. final int firstCodePoint = Character.isSurrogatePair(lastTwo.charAt(0), lastTwo.charAt(1)) ? Character.codePointAt(lastTwo, length - 3) : lastTwo.charAt(length - 2); if (canBeFollowedByDoubleSpacePeriod(firstCodePoint)) { cancelDoubleSpacePeriodCountdown(); mConnection.deleteSurroundingText(1, 0); final String textToInsert = inputTransaction.mSettingsValues.mSpacingAndPunctuations .mSentenceSeparatorAndSpace; mConnection.commitText(textToInsert, 1); inputTransaction.requireShiftUpdate(InputTransaction.SHIFT_UPDATE_NOW); inputTransaction.setRequiresUpdateSuggestions(); return true; } return false; } /** * Returns whether this code point can be followed by the double-space-to-period transformation. * * See #maybeDoubleSpaceToPeriod for details. * Generally, most word characters can be followed by the double-space-to-period transformation, * while most punctuation can't. Some punctuation however does allow for this to take place * after them, like the closing parenthesis for example. * * @param codePoint the code point after which we may want to apply the transformation * @return whether it's fine to apply the transformation after this code point. */ private static boolean canBeFollowedByDoubleSpacePeriod(final int codePoint) { // TODO: This should probably be a blacklist rather than a whitelist. // TODO: This should probably be language-dependant... return Character.isLetterOrDigit(codePoint) || codePoint == Constants.CODE_SINGLE_QUOTE || codePoint == Constants.CODE_DOUBLE_QUOTE || codePoint == Constants.CODE_CLOSING_PARENTHESIS || codePoint == Constants.CODE_CLOSING_SQUARE_BRACKET || codePoint == Constants.CODE_CLOSING_CURLY_BRACKET || codePoint == Constants.CODE_CLOSING_ANGLE_BRACKET || codePoint == Constants.CODE_PLUS || codePoint == Constants.CODE_PERCENT || Character.getType(codePoint) == Character.OTHER_SYMBOL; } /** * Performs a recapitalization event. * @param settingsValues The current settings values. */ private void performRecapitalization(final SettingsValues settingsValues) { if (!mConnection.hasSelection() || !mRecapitalizeStatus.mIsEnabled()) { return; // No selection or recapitalize is disabled for now } final int selectionStart = mConnection.getExpectedSelectionStart(); final int selectionEnd = mConnection.getExpectedSelectionEnd(); final int numCharsSelected = selectionEnd - selectionStart; if (numCharsSelected > Constants.MAX_CHARACTERS_FOR_RECAPITALIZATION) { // We bail out if we have too many characters for performance reasons. We don't want // to suck possibly multiple-megabyte data. return; } // If we have a recapitalize in progress, use it; otherwise, start a new one. if (!mRecapitalizeStatus.isStarted() || !mRecapitalizeStatus.isSetAt(selectionStart, selectionEnd)) { final CharSequence selectedText = mConnection.getSelectedText(0 /* flags, 0 for no styles */); if (TextUtils.isEmpty(selectedText)) return; // Race condition with the input connection mRecapitalizeStatus.start(selectionStart, selectionEnd, selectedText.toString(), settingsValues.mLocale, settingsValues.mSpacingAndPunctuations.mSortedWordSeparators); // We trim leading and trailing whitespace. mRecapitalizeStatus.trim(); } mConnection.finishComposingText(); mRecapitalizeStatus.rotate(); mConnection.setSelection(selectionEnd, selectionEnd); mConnection.deleteSurroundingText(numCharsSelected, 0); mConnection.commitText(mRecapitalizeStatus.getRecapitalizedString(), 0); mConnection.setSelection(mRecapitalizeStatus.getNewCursorStart(), mRecapitalizeStatus.getNewCursorEnd()); } private void performAdditionToUserHistoryDictionary(final SettingsValues settingsValues, final String suggestion, @Nonnull final NgramContext ngramContext) { // If correction is not enabled, we don't add words to the user history dictionary. // That's to avoid unintended additions in some sensitive fields, or fields that // expect to receive non-words. if (!settingsValues.mAutoCorrectionEnabledPerUserSettings) return; if (TextUtils.isEmpty(suggestion)) return; final boolean wasAutoCapitalized = mWordComposer.wasAutoCapitalized() && !mWordComposer.isMostlyCaps(); final int timeStampInSeconds = (int)TimeUnit.MILLISECONDS.toSeconds( System.currentTimeMillis()); mDictionaryFacilitator.addToUserHistory(suggestion, wasAutoCapitalized, ngramContext, timeStampInSeconds, settingsValues.mBlockPotentiallyOffensive); } public void performUpdateSuggestionStripSync(final SettingsValues settingsValues, final int inputStyle) { // Check if we have a suggestion engine attached. if (!settingsValues.needsToLookupSuggestions()) { if (mWordComposer.isComposingWord()) { Log.w(TAG, "Called updateSuggestionsOrPredictions but suggestions were not " + "requested!"); } // Clear the suggestions strip. mSuggestionStripViewAccessor.showSuggestionStrip(SuggestedWords.getEmptyInstance()); return; } if (!mWordComposer.isComposingWord() && !settingsValues.mBigramPredictionEnabled) { mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); return; } final AsyncResultHolder holder = new AsyncResultHolder<>(); mInputLogicHandler.getSuggestedWords(inputStyle, SuggestedWords.NOT_A_SEQUENCE_NUMBER, new OnGetSuggestedWordsCallback() { @Override public void onGetSuggestedWords(final SuggestedWords suggestedWords) { final String typedWordString = mWordComposer.getTypedWord(); final SuggestedWordInfo typedWordInfo = new SuggestedWordInfo( typedWordString, "" /* prevWordsContext */, SuggestedWordInfo.MAX_SCORE, SuggestedWordInfo.KIND_TYPED, Dictionary.DICTIONARY_USER_TYPED, SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */, SuggestedWordInfo.NOT_A_CONFIDENCE); // Show new suggestions if we have at least one. Otherwise keep the old // suggestions with the new typed word. Exception: if the length of the // typed word is <= 1 (after a deletion typically) we clear old suggestions. if (suggestedWords.size() > 1 || typedWordString.length() <= 1) { holder.set(suggestedWords); } else { holder.set(retrieveOlderSuggestions(typedWordInfo, mSuggestedWords)); } } } ); // This line may cause the current thread to wait. final SuggestedWords suggestedWords = holder.get(null, Constants.GET_SUGGESTED_WORDS_TIMEOUT); if (suggestedWords != null) { mSuggestionStripViewAccessor.showSuggestionStrip(suggestedWords); } } /** * Check if the cursor is touching a word. If so, restart suggestions on this word, else * do nothing. * * @param settingsValues the current values of the settings. * @param forStartInput whether we're doing this in answer to starting the input (as opposed * to a cursor move, for example). In ICS, there is a platform bug that we need to work * around only when we come here at input start time. */ public void restartSuggestionsOnWordTouchedByCursor(final SettingsValues settingsValues, final boolean forStartInput, // TODO: remove this argument, put it into settingsValues final int currentKeyboardScriptId) { // HACK: We may want to special-case some apps that exhibit bad behavior in case of // recorrection. This is a temporary, stopgap measure that will be removed later. // TODO: remove this. if (settingsValues.isBrokenByRecorrection() // Recorrection is not supported in languages without spaces because we don't know // how to segment them yet. || !settingsValues.mSpacingAndPunctuations.mCurrentLanguageHasSpaces // If no suggestions are requested, don't try restarting suggestions. || !settingsValues.needsToLookupSuggestions() // If we are currently in a batch input, we must not resume suggestions, or the result // of the batch input will replace the new composition. This may happen in the corner case // that the app moves the cursor on its own accord during a batch input. || mInputLogicHandler.isInBatchInput() // If the cursor is not touching a word, or if there is a selection, return right away. || mConnection.hasSelection() // If we don't know the cursor location, return. || mConnection.getExpectedSelectionStart() < 0) { mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); return; } final int expectedCursorPosition = mConnection.getExpectedSelectionStart(); if (!mConnection.isCursorTouchingWord(settingsValues.mSpacingAndPunctuations)) { // Show predictions. mWordComposer.setCapitalizedModeAtStartComposingTime(WordComposer.CAPS_MODE_OFF); mLatinIME.mHandler.postUpdateSuggestionStrip(SuggestedWords.INPUT_STYLE_RECORRECTION); return; } final TextRange range = mConnection.getWordRangeAtCursor( settingsValues.mSpacingAndPunctuations, currentKeyboardScriptId); if (null == range) return; // Happens if we don't have an input connection at all if (range.length() <= 0) { // Race condition, or touching a word in a non-supported script. mLatinIME.setNeutralSuggestionStrip(); return; } // If for some strange reason (editor bug or so) we measure the text before the cursor as // longer than what the entire text is supposed to be, the safe thing to do is bail out. if (range.mHasUrlSpans) return; // If there are links, we don't resume suggestions. Making // edits to a linkified text through batch commands would ruin the URL spans, and unless // we take very complicated steps to preserve the whole link, we can't do things right so // we just do not resume because it's safer. final int numberOfCharsInWordBeforeCursor = range.getNumberOfCharsInWordBeforeCursor(); if (numberOfCharsInWordBeforeCursor > expectedCursorPosition) return; final ArrayList suggestions = new ArrayList<>(); final String typedWordString = range.mWord.toString(); final SuggestedWordInfo typedWordInfo = new SuggestedWordInfo(typedWordString, "" /* prevWordsContext */, SuggestedWords.MAX_SUGGESTIONS + 1, SuggestedWordInfo.KIND_TYPED, Dictionary.DICTIONARY_USER_TYPED, SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */, SuggestedWordInfo.NOT_A_CONFIDENCE /* autoCommitFirstWordConfidence */); suggestions.add(typedWordInfo); if (!isResumableWord(settingsValues, typedWordString)) { mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); return; } int i = 0; for (final SuggestionSpan span : range.getSuggestionSpansAtWord()) { for (final String s : span.getSuggestions()) { ++i; if (!TextUtils.equals(s, typedWordString)) { suggestions.add(new SuggestedWordInfo(s, "" /* prevWordsContext */, SuggestedWords.MAX_SUGGESTIONS - i, SuggestedWordInfo.KIND_RESUMED, Dictionary.DICTIONARY_RESUMED, SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */, SuggestedWordInfo.NOT_A_CONFIDENCE /* autoCommitFirstWordConfidence */)); } } } final int[] codePoints = StringUtils.toCodePointArray(typedWordString); mWordComposer.setComposingWord(codePoints, mLatinIME.getCoordinatesForCurrentKeyboard(codePoints)); mWordComposer.setCursorPositionWithinWord( typedWordString.codePointCount(0, numberOfCharsInWordBeforeCursor)); if (forStartInput) { mConnection.maybeMoveTheCursorAroundAndRestoreToWorkaroundABug(); } mConnection.setComposingRegion(expectedCursorPosition - numberOfCharsInWordBeforeCursor, expectedCursorPosition + range.getNumberOfCharsInWordAfterCursor()); if (suggestions.size() <= 1) { // If there weren't any suggestion spans on this word, suggestions#size() will be 1 // if shouldIncludeResumedWordInSuggestions is true, 0 otherwise. In this case, we // have no useful suggestions, so we will try to compute some for it instead. mInputLogicHandler.getSuggestedWords(Suggest.SESSION_ID_TYPING, SuggestedWords.NOT_A_SEQUENCE_NUMBER, new OnGetSuggestedWordsCallback() { @Override public void onGetSuggestedWords(final SuggestedWords suggestedWords) { doShowSuggestionsAndClearAutoCorrectionIndicator(suggestedWords); }}); } else { // We found suggestion spans in the word. We'll create the SuggestedWords out of // them, and make willAutoCorrect false. We make typedWordValid false, because the // color of the word in the suggestion strip changes according to this parameter, // and false gives the correct color. final SuggestedWords suggestedWords = new SuggestedWords(suggestions, null /* rawSuggestions */, typedWordInfo, false /* typedWordValid */, false /* willAutoCorrect */, false /* isObsoleteSuggestions */, SuggestedWords.INPUT_STYLE_RECORRECTION, SuggestedWords.NOT_A_SEQUENCE_NUMBER); doShowSuggestionsAndClearAutoCorrectionIndicator(suggestedWords); } } void doShowSuggestionsAndClearAutoCorrectionIndicator(final SuggestedWords suggestedWords) { mIsAutoCorrectionIndicatorOn = false; mLatinIME.mHandler.showSuggestionStrip(suggestedWords); } /** * Reverts a previous commit with auto-correction. * * This is triggered upon pressing backspace just after a commit with auto-correction. * * @param inputTransaction The transaction in progress. * @param settingsValues the current values of the settings. */ private void revertCommit(final InputTransaction inputTransaction, final SettingsValues settingsValues) { final CharSequence originallyTypedWord = mLastComposedWord.mTypedWord; final String originallyTypedWordString = originallyTypedWord != null ? originallyTypedWord.toString() : ""; final CharSequence committedWord = mLastComposedWord.mCommittedWord; final String committedWordString = committedWord.toString(); final int cancelLength = committedWord.length(); final String separatorString = mLastComposedWord.mSeparatorString; // If our separator is a space, we won't actually commit it, // but set the space state to PHANTOM so that a space will be inserted // on the next keypress final boolean usePhantomSpace = separatorString.equals(Constants.STRING_SPACE); // We want java chars, not codepoints for the following. final int separatorLength = separatorString.length(); // TODO: should we check our saved separator against the actual contents of the text view? final int deleteLength = cancelLength + separatorLength; if (DebugFlags.DEBUG_ENABLED) { if (mWordComposer.isComposingWord()) { throw new RuntimeException("revertCommit, but we are composing a word"); } final CharSequence wordBeforeCursor = mConnection.getTextBeforeCursor(deleteLength, 0).subSequence(0, cancelLength); if (!TextUtils.equals(committedWord, wordBeforeCursor)) { throw new RuntimeException("revertCommit check failed: we thought we were " + "reverting \"" + committedWord + "\", but before the cursor we found \"" + wordBeforeCursor + "\""); } } mConnection.deleteSurroundingText(deleteLength, 0); if (!TextUtils.isEmpty(committedWord)) { unlearnWord(committedWordString, inputTransaction.mSettingsValues, Constants.EVENT_REVERT); } final String stringToCommit = originallyTypedWord + (usePhantomSpace ? "" : separatorString); final SpannableString textToCommit = new SpannableString(stringToCommit); if (committedWord instanceof SpannableString) { final SpannableString committedWordWithSuggestionSpans = (SpannableString)committedWord; final Object[] spans = committedWordWithSuggestionSpans.getSpans(0, committedWord.length(), Object.class); final int lastCharIndex = textToCommit.length() - 1; // We will collect all suggestions in the following array. final ArrayList suggestions = new ArrayList<>(); // First, add the committed word to the list of suggestions. suggestions.add(committedWordString); for (final Object span : spans) { // If this is a suggestion span, we check that the word is not the committed word. // That should mostly be the case. // Given this, we add it to the list of suggestions, otherwise we discard it. if (span instanceof SuggestionSpan) { final SuggestionSpan suggestionSpan = (SuggestionSpan)span; for (final String suggestion : suggestionSpan.getSuggestions()) { if (!suggestion.equals(committedWordString)) { suggestions.add(suggestion); } } } else { // If this is not a suggestion span, we just add it as is. textToCommit.setSpan(span, 0 /* start */, lastCharIndex /* end */, committedWordWithSuggestionSpans.getSpanFlags(span)); } } // Add the suggestion list to the list of suggestions. textToCommit.setSpan(new SuggestionSpan(mLatinIME /* context */, inputTransaction.mSettingsValues.mLocale, suggestions.toArray(new String[suggestions.size()]), 0 /* flags */, null /* notificationTargetClass */), 0 /* start */, lastCharIndex /* end */, 0 /* flags */); } if (inputTransaction.mSettingsValues.mSpacingAndPunctuations.mCurrentLanguageHasSpaces) { mConnection.commitText(textToCommit, 1); if (usePhantomSpace) { mSpaceState = SpaceState.PHANTOM; } } else { // For languages without spaces, we revert the typed string but the cursor is flush // with the typed word, so we need to resume suggestions right away. final int[] codePoints = StringUtils.toCodePointArray(stringToCommit); mWordComposer.setComposingWord(codePoints, mLatinIME.getCoordinatesForCurrentKeyboard(codePoints)); setComposingTextInternal(textToCommit, 1); } // Don't restart suggestion yet. We'll restart if the user deletes the separator. mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD; // We have a separator between the word and the cursor: we should show predictions. inputTransaction.setRequiresUpdateSuggestions(); } /** * Factor in auto-caps and manual caps and compute the current caps mode. * @param settingsValues the current settings values. * @param keyboardShiftMode the current shift mode of the keyboard. See * KeyboardSwitcher#getKeyboardShiftMode() for possible values. * @return the actual caps mode the keyboard is in right now. */ private int getActualCapsMode(final SettingsValues settingsValues, final int keyboardShiftMode) { if (keyboardShiftMode != WordComposer.CAPS_MODE_AUTO_SHIFTED) { return keyboardShiftMode; } final int auto = getCurrentAutoCapsState(settingsValues); if (0 != (auto & TextUtils.CAP_MODE_CHARACTERS)) { return WordComposer.CAPS_MODE_AUTO_SHIFT_LOCKED; } if (0 != auto) { return WordComposer.CAPS_MODE_AUTO_SHIFTED; } return WordComposer.CAPS_MODE_OFF; } /** * Gets the current auto-caps state, factoring in the space state. * * This method tries its best to do this in the most efficient possible manner. It avoids * getting text from the editor if possible at all. * This is called from the KeyboardSwitcher (through a trampoline in LatinIME) because it * needs to know auto caps state to display the right layout. * * @param settingsValues the relevant settings values * @return a caps mode from TextUtils.CAP_MODE_* or Constants.TextUtils.CAP_MODE_OFF. */ public int getCurrentAutoCapsState(final SettingsValues settingsValues) { if (!settingsValues.mAutoCap) return Constants.TextUtils.CAP_MODE_OFF; final EditorInfo ei = getCurrentInputEditorInfo(); if (ei == null) return Constants.TextUtils.CAP_MODE_OFF; final int inputType = ei.inputType; // Warning: this depends on mSpaceState, which may not be the most current value. If // mSpaceState gets updated later, whoever called this may need to be told about it. return mConnection.getCursorCapsMode(inputType, settingsValues.mSpacingAndPunctuations, SpaceState.PHANTOM == mSpaceState); } public int getCurrentRecapitalizeState() { if (!mRecapitalizeStatus.isStarted() || !mRecapitalizeStatus.isSetAt(mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd())) { // Not recapitalizing at the moment return RecapitalizeStatus.NOT_A_RECAPITALIZE_MODE; } return mRecapitalizeStatus.getCurrentMode(); } /** * @return the editor info for the current editor */ private EditorInfo getCurrentInputEditorInfo() { return mLatinIME.getCurrentInputEditorInfo(); } /** * Get n-gram context from the nth previous word before the cursor as context * for the suggestion process. * @param spacingAndPunctuations the current spacing and punctuations settings. * @param nthPreviousWord reverse index of the word to get (1-indexed) * @return the information of previous words */ public NgramContext getNgramContextFromNthPreviousWordForSuggestion( final SpacingAndPunctuations spacingAndPunctuations, final int nthPreviousWord) { if (spacingAndPunctuations.mCurrentLanguageHasSpaces) { // If we are typing in a language with spaces we can just look up the previous // word information from textview. return mConnection.getNgramContextFromNthPreviousWord( spacingAndPunctuations, nthPreviousWord); } if (LastComposedWord.NOT_A_COMPOSED_WORD == mLastComposedWord) { return NgramContext.BEGINNING_OF_SENTENCE; } return new NgramContext(new NgramContext.WordInfo( mLastComposedWord.mCommittedWord.toString())); } /** * Tests the passed word for resumability. * * We can resume suggestions on words whose first code point is a word code point (with some * nuances: check the code for details). * * @param settings the current values of the settings. * @param word the word to evaluate. * @return whether it's fine to resume suggestions on this word. */ private static boolean isResumableWord(final SettingsValues settings, final String word) { final int firstCodePoint = word.codePointAt(0); return settings.isWordCodePoint(firstCodePoint) && Constants.CODE_SINGLE_QUOTE != firstCodePoint && Constants.CODE_DASH != firstCodePoint; } /** * @param actionId the action to perform */ private void performEditorAction(final int actionId) { mConnection.performEditorAction(actionId); } /** * Perform the processing specific to inputting TLDs. * * Some keys input a TLD (specifically, the ".com" key) and this warrants some specific * processing. First, if this is a TLD, we ignore PHANTOM spaces -- this is done by type * of character in onCodeInput, but since this gets inputted as a whole string we need to * do it here specifically. Then, if the last character before the cursor is a period, then * we cut the dot at the start of ".com". This is because humans tend to type "www.google." * and then press the ".com" key and instinctively don't expect to get "www.google..com". * * @param text the raw text supplied to onTextInput * @return the text to actually send to the editor */ private String performSpecificTldProcessingOnTextInput(final String text) { if (text.length() <= 1 || text.charAt(0) != Constants.CODE_PERIOD || !Character.isLetter(text.charAt(1))) { // Not a tld: do nothing. return text; } // We have a TLD (or something that looks like this): make sure we don't add // a space even if currently in phantom mode. mSpaceState = SpaceState.NONE; final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor(); // If no code point, #getCodePointBeforeCursor returns NOT_A_CODE_POINT. if (Constants.CODE_PERIOD == codePointBeforeCursor) { return text.substring(1); } return text; } /** * Handle a press on the settings key. */ private void onSettingsKeyPressed() { mLatinIME.displaySettingsDialog(); } /** * Resets the whole input state to the starting state. * * This will clear the composing word, reset the last composed word, clear the suggestion * strip and tell the input connection about it so that it can refresh its caches. * * @param newSelStart the new selection start, in java characters. * @param newSelEnd the new selection end, in java characters. * @param clearSuggestionStrip whether this method should clear the suggestion strip. */ // TODO: how is this different from startInput ?! private void resetEntireInputState(final int newSelStart, final int newSelEnd, final boolean clearSuggestionStrip) { final boolean shouldFinishComposition = mWordComposer.isComposingWord(); resetComposingState(true /* alsoResetLastComposedWord */); if (clearSuggestionStrip) { mSuggestionStripViewAccessor.setNeutralSuggestionStrip(); } mConnection.resetCachesUponCursorMoveAndReturnSuccess(newSelStart, newSelEnd, shouldFinishComposition); } /** * Resets only the composing state. * * Compare #resetEntireInputState, which also clears the suggestion strip and resets the * input connection caches. This only deals with the composing state. * * @param alsoResetLastComposedWord whether to also reset the last composed word. */ private void resetComposingState(final boolean alsoResetLastComposedWord) { mWordComposer.reset(); if (alsoResetLastComposedWord) { mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD; } } /** * Make a {@link com.android.inputmethod.latin.SuggestedWords} object containing a typed word * and obsolete suggestions. * See {@link com.android.inputmethod.latin.SuggestedWords#getTypedWordAndPreviousSuggestions( * SuggestedWordInfo, com.android.inputmethod.latin.SuggestedWords)}. * @param typedWordInfo The typed word as a SuggestedWordInfo. * @param previousSuggestedWords The previously suggested words. * @return Obsolete suggestions with the newly typed word. */ static SuggestedWords retrieveOlderSuggestions(final SuggestedWordInfo typedWordInfo, final SuggestedWords previousSuggestedWords) { final SuggestedWords oldSuggestedWords = previousSuggestedWords.isPunctuationSuggestions() ? SuggestedWords.getEmptyInstance() : previousSuggestedWords; final ArrayList typedWordAndPreviousSuggestions = SuggestedWords.getTypedWordAndPreviousSuggestions(typedWordInfo, oldSuggestedWords); return new SuggestedWords(typedWordAndPreviousSuggestions, null /* rawSuggestions */, typedWordInfo, false /* typedWordValid */, false /* hasAutoCorrectionCandidate */, true /* isObsoleteSuggestions */, oldSuggestedWords.mInputStyle, SuggestedWords.NOT_A_SEQUENCE_NUMBER); } /** * Gets a chunk of text with or the auto-correction indicator underline span as appropriate. * * This method looks at the old state of the auto-correction indicator to put or not put * the underline span as appropriate. It is important to note that this does not correspond * exactly to whether this word will be auto-corrected to or not: what's important here is * to keep the same indication as before. * When we add a new code point to a composing word, we don't know yet if we are going to * auto-correct it until the suggestions are computed. But in the mean time, we still need * to display the character and to extend the previous underline. To avoid any flickering, * the underline should keep the same color it used to have, even if that's not ultimately * the correct color for this new word. When the suggestions are finished evaluating, we * will call this method again to fix the color of the underline. * * @param text the text on which to maybe apply the span. * @return the same text, with the auto-correction underline span if that's appropriate. */ // TODO: Shouldn't this go in some *Utils class instead? private CharSequence getTextWithUnderline(final String text) { return mIsAutoCorrectionIndicatorOn ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(mLatinIME, text) : text; } /** * Sends a DOWN key event followed by an UP key event to the editor. * * If possible at all, avoid using this method. It causes all sorts of race conditions with * the text view because it goes through a different, asynchronous binder. Also, batch edits * are ignored for key events. Use the normal software input methods instead. * * @param keyCode the key code to send inside the key event. */ private void sendDownUpKeyEvent(final int keyCode) { final long eventTime = SystemClock.uptimeMillis(); mConnection.sendKeyEvent(new KeyEvent(eventTime, eventTime, KeyEvent.ACTION_DOWN, keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE)); mConnection.sendKeyEvent(new KeyEvent(SystemClock.uptimeMillis(), eventTime, KeyEvent.ACTION_UP, keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE)); } /** * Sends a code point to the editor, using the most appropriate method. * * Normally we send code points with commitText, but there are some cases (where backward * compatibility is a concern for example) where we want to use deprecated methods. * * @param settingsValues the current values of the settings. * @param codePoint the code point to send. */ // TODO: replace these two parameters with an InputTransaction private void sendKeyCodePoint(final SettingsValues settingsValues, final int codePoint) { // TODO: Remove this special handling of digit letters. // For backward compatibility. See {@link InputMethodService#sendKeyChar(char)}. if (codePoint >= '0' && codePoint <= '9') { sendDownUpKeyEvent(codePoint - '0' + KeyEvent.KEYCODE_0); return; } // TODO: we should do this also when the editor has TYPE_NULL if (Constants.CODE_ENTER == codePoint && settingsValues.isBeforeJellyBean()) { // Backward compatibility mode. Before Jelly bean, the keyboard would simulate // a hardware keyboard event on pressing enter or delete. This is bad for many // reasons (there are race conditions with commits) but some applications are // relying on this behavior so we continue to support it for older apps. sendDownUpKeyEvent(KeyEvent.KEYCODE_ENTER); } else { mConnection.commitText(StringUtils.newSingleCodePointString(codePoint), 1); } } /** * Insert an automatic space, if the options allow it. * * This checks the options and the text before the cursor are appropriate before inserting * an automatic space. * * @param settingsValues the current values of the settings. */ private void insertAutomaticSpaceIfOptionsAndTextAllow(final SettingsValues settingsValues) { if (settingsValues.shouldInsertSpacesAutomatically() && settingsValues.mSpacingAndPunctuations.mCurrentLanguageHasSpaces && !mConnection.textBeforeCursorLooksLikeURL()) { sendKeyCodePoint(settingsValues, Constants.CODE_SPACE); } } /** * Do the final processing after a batch input has ended. This commits the word to the editor. * @param settingsValues the current values of the settings. * @param suggestedWords suggestedWords to use. */ public void onUpdateTailBatchInputCompleted(final SettingsValues settingsValues, final SuggestedWords suggestedWords, final KeyboardSwitcher keyboardSwitcher) { final String batchInputText = suggestedWords.isEmpty() ? null : suggestedWords.getWord(0); if (TextUtils.isEmpty(batchInputText)) { return; } mConnection.beginBatchEdit(); if (SpaceState.PHANTOM == mSpaceState) { insertAutomaticSpaceIfOptionsAndTextAllow(settingsValues); } mWordComposer.setBatchInputWord(batchInputText); setComposingTextInternal(batchInputText, 1); mConnection.endBatchEdit(); // Space state must be updated before calling updateShiftState mSpaceState = SpaceState.PHANTOM; keyboardSwitcher.requestUpdatingShiftState(getCurrentAutoCapsState(settingsValues), getCurrentRecapitalizeState()); } /** * Commit the typed string to the editor. * * This is typically called when we should commit the currently composing word without applying * auto-correction to it. Typically, we come here upon pressing a separator when the keyboard * is configured to not do auto-correction at all (because of the settings or the properties of * the editor). In this case, `separatorString' is set to the separator that was pressed. * We also come here in a variety of cases with external user action. For example, when the * cursor is moved while there is a composition, or when the keyboard is closed, or when the * user presses the Send button for an SMS, we don't auto-correct as that would be unexpected. * In this case, `separatorString' is set to NOT_A_SEPARATOR. * * @param settingsValues the current values of the settings. * @param separatorString the separator that's causing the commit, or NOT_A_SEPARATOR if none. */ public void commitTyped(final SettingsValues settingsValues, final String separatorString) { if (!mWordComposer.isComposingWord()) return; final String typedWord = mWordComposer.getTypedWord(); if (typedWord.length() > 0) { final boolean isBatchMode = mWordComposer.isBatchMode(); commitChosenWord(settingsValues, typedWord, LastComposedWord.COMMIT_TYPE_USER_TYPED_WORD, separatorString); StatsUtils.onWordCommitUserTyped(typedWord, isBatchMode); } } /** * Commit the current auto-correction. * * This will commit the best guess of the keyboard regarding what the user meant by typing * the currently composing word. The IME computes suggestions and assigns a confidence score * to each of them; when it's confident enough in one suggestion, it replaces the typed string * by this suggestion at commit time. When it's not confident enough, or when it has no * suggestions, or when the settings or environment does not allow for auto-correction, then * this method just commits the typed string. * Note that if suggestions are currently being computed in the background, this method will * block until the computation returns. This is necessary for consistency (it would be very * strange if pressing space would commit a different word depending on how fast you press). * * @param settingsValues the current value of the settings. * @param separator the separator that's causing the commit to happen. */ private void commitCurrentAutoCorrection(final SettingsValues settingsValues, final String separator, final LatinIME.UIHandler handler) { // Complete any pending suggestions query first if (handler.hasPendingUpdateSuggestions()) { handler.cancelUpdateSuggestionStrip(); // To know the input style here, we should retrieve the in-flight "update suggestions" // message and read its arg1 member here. However, the Handler class does not let // us retrieve this message, so we can't do that. But in fact, we notice that // we only ever come here when the input style was typing. In the case of batch // input, we update the suggestions synchronously when the tail batch comes. Likewise // for application-specified completions. As for recorrections, we never auto-correct, // so we don't come here either. Hence, the input style is necessarily // INPUT_STYLE_TYPING. performUpdateSuggestionStripSync(settingsValues, SuggestedWords.INPUT_STYLE_TYPING); } final SuggestedWordInfo autoCorrectionOrNull = mWordComposer.getAutoCorrectionOrNull(); final String typedWord = mWordComposer.getTypedWord(); final String stringToCommit = (autoCorrectionOrNull != null) ? autoCorrectionOrNull.mWord : typedWord; if (stringToCommit != null) { if (TextUtils.isEmpty(typedWord)) { throw new RuntimeException("We have an auto-correction but the typed word " + "is empty? Impossible! I must commit suicide."); } final boolean isBatchMode = mWordComposer.isBatchMode(); commitChosenWord(settingsValues, stringToCommit, LastComposedWord.COMMIT_TYPE_DECIDED_WORD, separator); if (!typedWord.equals(stringToCommit)) { // This will make the correction flash for a short while as a visual clue // to the user that auto-correction happened. It has no other effect; in particular // note that this won't affect the text inside the text field AT ALL: it only makes // the segment of text starting at the supplied index and running for the length // of the auto-correction flash. At this moment, the "typedWord" argument is // ignored by TextView. mConnection.commitCorrection(new CorrectionInfo( mConnection.getExpectedSelectionEnd() - stringToCommit.length(), typedWord, stringToCommit)); String prevWordsContext = (autoCorrectionOrNull != null) ? autoCorrectionOrNull.mPrevWordsContext : ""; StatsUtils.onAutoCorrection(typedWord, stringToCommit, isBatchMode, mDictionaryFacilitator, prevWordsContext); StatsUtils.onWordCommitAutoCorrect(stringToCommit, isBatchMode); } else { StatsUtils.onWordCommitUserTyped(stringToCommit, isBatchMode); } } } /** * Commits the chosen word to the text field and saves it for later retrieval. * * @param settingsValues the current values of the settings. * @param chosenWord the word we want to commit. * @param commitType the type of the commit, as one of LastComposedWord.COMMIT_TYPE_* * @param separatorString the separator that's causing the commit, or NOT_A_SEPARATOR if none. */ private void commitChosenWord(final SettingsValues settingsValues, final String chosenWord, final int commitType, final String separatorString) { final SuggestedWords suggestedWords = mSuggestedWords; final CharSequence chosenWordWithSuggestions = SuggestionSpanUtils.getTextWithSuggestionSpan(mLatinIME, chosenWord, suggestedWords); // When we are composing word, get n-gram context from the 2nd previous word because the // 1st previous word is the word to be committed. Otherwise get n-gram context from the 1st // previous word. final NgramContext ngramContext = mConnection.getNgramContextFromNthPreviousWord( settingsValues.mSpacingAndPunctuations, mWordComposer.isComposingWord() ? 2 : 1); mConnection.commitText(chosenWordWithSuggestions, 1); // Add the word to the user history dictionary performAdditionToUserHistoryDictionary(settingsValues, chosenWord, ngramContext); // TODO: figure out here if this is an auto-correct or if the best word is actually // what user typed. Note: currently this is done much later in // LastComposedWord#didCommitTypedWord by string equality of the remembered // strings. mLastComposedWord = mWordComposer.commitWord(commitType, chosenWordWithSuggestions, separatorString, ngramContext); } /** * Retry resetting caches in the rich input connection. * * When the editor can't be accessed we can't reset the caches, so we schedule a retry. * This method handles the retry, and re-schedules a new retry if we still can't access. * We only retry up to 5 times before giving up. * * @param tryResumeSuggestions Whether we should resume suggestions or not. * @param remainingTries How many times we may try again before giving up. * @return whether true if the caches were successfully reset, false otherwise. */ public boolean retryResetCachesAndReturnSuccess(final boolean tryResumeSuggestions, final int remainingTries, final LatinIME.UIHandler handler) { final boolean shouldFinishComposition = mConnection.hasSelection() || !mConnection.isCursorPositionKnown(); if (!mConnection.resetCachesUponCursorMoveAndReturnSuccess( mConnection.getExpectedSelectionStart(), mConnection.getExpectedSelectionEnd(), shouldFinishComposition)) { if (0 < remainingTries) { handler.postResetCaches(tryResumeSuggestions, remainingTries - 1); return false; } // If remainingTries is 0, we should stop waiting for new tries, however we'll still // return true as we need to perform other tasks (for example, loading the keyboard). } mConnection.tryFixLyingCursorPosition(); if (tryResumeSuggestions) { handler.postResumeSuggestions(true /* shouldDelay */); } return true; } public void getSuggestedWords(final SettingsValues settingsValues, final Keyboard keyboard, final int keyboardShiftMode, final int inputStyle, final int sequenceNumber, final OnGetSuggestedWordsCallback callback) { mWordComposer.adviseCapitalizedModeBeforeFetchingSuggestions( getActualCapsMode(settingsValues, keyboardShiftMode)); mSuggest.getSuggestedWords(mWordComposer, getNgramContextFromNthPreviousWordForSuggestion( settingsValues.mSpacingAndPunctuations, // Get the word on which we should search the bigrams. If we are composing // a word, it's whatever is *before* the half-committed word in the buffer, // hence 2; if we aren't, we should just skip whitespace if any, so 1. mWordComposer.isComposingWord() ? 2 : 1), keyboard, new SettingsValuesForSuggestion(settingsValues.mBlockPotentiallyOffensive), settingsValues.mAutoCorrectionEnabledPerUserSettings, inputStyle, sequenceNumber, callback); } /** * Used as an injection point for each call of * {@link RichInputConnection#setComposingText(CharSequence, int)}. * *

Currently using this method is optional and you can still directly call * {@link RichInputConnection#setComposingText(CharSequence, int)}, but it is recommended to * use this method whenever possible.

*

TODO: Should we move this mechanism to {@link RichInputConnection}?

* * @param newComposingText the composing text to be set * @param newCursorPosition the new cursor position */ private void setComposingTextInternal(final CharSequence newComposingText, final int newCursorPosition) { setComposingTextInternalWithBackgroundColor(newComposingText, newCursorPosition, Color.TRANSPARENT, newComposingText.length()); } /** * Equivalent to {@link #setComposingTextInternal(CharSequence, int)} except that this method * allows to set {@link BackgroundColorSpan} to the composing text with the given color. * *

TODO: Currently the background color is exclusive with the black underline, which is * automatically added by the framework. We need to change the framework if we need to have both * of them at the same time.

*

TODO: Should we move this method to {@link RichInputConnection}?

* * @param newComposingText the composing text to be set * @param newCursorPosition the new cursor position * @param backgroundColor the background color to be set to the composing text. Set * {@link Color#TRANSPARENT} to disable the background color. * @param coloredTextLength the length of text, in Java chars, which should be rendered with * the given background color. */ private void setComposingTextInternalWithBackgroundColor(final CharSequence newComposingText, final int newCursorPosition, final int backgroundColor, final int coloredTextLength) { final CharSequence composingTextToBeSet; if (backgroundColor == Color.TRANSPARENT) { composingTextToBeSet = newComposingText; } else { final SpannableString spannable = new SpannableString(newComposingText); final BackgroundColorSpan backgroundColorSpan = new BackgroundColorSpan(backgroundColor); final int spanLength = Math.min(coloredTextLength, spannable.length()); spannable.setSpan(backgroundColorSpan, 0, spanLength, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE | Spanned.SPAN_COMPOSING); composingTextToBeSet = spannable; } mConnection.setComposingText(composingTextToBeSet, newCursorPosition); } /** * Gets an object allowing private IME commands to be sent to the * underlying editor. * @return An object for sending private commands to the underlying editor. */ public PrivateCommandPerformer getPrivateCommandPerformer() { return mConnection; } /** * Gets the expected index of the first char of the composing span within the editor's text. * Returns a negative value in case there appears to be no valid composing span. * * @see #getComposingLength() * @see RichInputConnection#hasSelection() * @see RichInputConnection#isCursorPositionKnown() * @see RichInputConnection#getExpectedSelectionStart() * @see RichInputConnection#getExpectedSelectionEnd() * @return The expected index in Java chars of the first char of the composing span. */ // TODO: try and see if we can get rid of this method. Ideally the users of this class should // never need to know this. public int getComposingStart() { if (!mConnection.isCursorPositionKnown() || mConnection.hasSelection()) { return -1; } return mConnection.getExpectedSelectionStart() - mWordComposer.size(); } /** * Gets the expected length in Java chars of the composing span. * May be 0 if there is no valid composing span. * @see #getComposingStart() * @return The expected length of the composing span. */ // TODO: try and see if we can get rid of this method. Ideally the users of this class should // never need to know this. public int getComposingLength() { return mWordComposer.size(); } }