491 lines
19 KiB
Java
491 lines
19 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin;
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import com.android.inputmethod.keyboard.Key;
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import com.android.inputmethod.keyboard.Keyboard;
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import com.android.inputmethod.latin.utils.StringUtils;
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import java.util.Arrays;
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/**
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* A place to store the currently composing word with information such as adjacent key codes as well
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*/
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public final class WordComposer {
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private static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
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private static final boolean DBG = LatinImeLogger.sDBG;
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public static final int CAPS_MODE_OFF = 0;
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// 1 is shift bit, 2 is caps bit, 4 is auto bit but this is just a convention as these bits
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// aren't used anywhere in the code
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public static final int CAPS_MODE_MANUAL_SHIFTED = 0x1;
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public static final int CAPS_MODE_MANUAL_SHIFT_LOCKED = 0x3;
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public static final int CAPS_MODE_AUTO_SHIFTED = 0x5;
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public static final int CAPS_MODE_AUTO_SHIFT_LOCKED = 0x7;
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// An array of code points representing the characters typed so far.
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// The array is limited to MAX_WORD_LENGTH code points, but mTypedWord extends past that
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// and mCodePointSize can go past that. If mCodePointSize is greater than MAX_WORD_LENGTH,
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// this just does not contain the associated code points past MAX_WORD_LENGTH.
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private int[] mPrimaryKeyCodes;
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private final InputPointers mInputPointers = new InputPointers(MAX_WORD_LENGTH);
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// This is the typed word, as a StringBuilder. This has the same contents as mPrimaryKeyCodes
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// but under a StringBuilder representation for ease of use, depending on what is more useful
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// at any given time. However this is not limited in size, while mPrimaryKeyCodes is limited
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// to MAX_WORD_LENGTH code points.
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private final StringBuilder mTypedWord;
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private String mAutoCorrection;
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private boolean mIsResumed;
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private boolean mIsBatchMode;
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// A memory of the last rejected batch mode suggestion, if any. This goes like this: the user
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// gestures a word, is displeased with the results and hits backspace, then gestures again.
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// At the very least we should avoid re-suggesting the same thing, and to do that we memorize
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// the rejected suggestion in this variable.
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// TODO: this should be done in a comprehensive way by the User History feature instead of
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// as an ad-hockery here.
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private String mRejectedBatchModeSuggestion;
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// Cache these values for performance
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private int mCapsCount;
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private int mDigitsCount;
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private int mCapitalizedMode;
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private int mTrailingSingleQuotesCount;
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// This is the number of code points entered so far. This is not limited to MAX_WORD_LENGTH.
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// In general, this contains the size of mPrimaryKeyCodes, except when this is greater than
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// MAX_WORD_LENGTH in which case mPrimaryKeyCodes only contain the first MAX_WORD_LENGTH
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// code points.
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private int mCodePointSize;
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private int mCursorPositionWithinWord;
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/**
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* Whether the user chose to capitalize the first char of the word.
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*/
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private boolean mIsFirstCharCapitalized;
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public WordComposer() {
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mPrimaryKeyCodes = new int[MAX_WORD_LENGTH];
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mTypedWord = new StringBuilder(MAX_WORD_LENGTH);
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mAutoCorrection = null;
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mTrailingSingleQuotesCount = 0;
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mIsResumed = false;
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mIsBatchMode = false;
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mCursorPositionWithinWord = 0;
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mRejectedBatchModeSuggestion = null;
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refreshSize();
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}
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public WordComposer(final WordComposer source) {
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mPrimaryKeyCodes = Arrays.copyOf(source.mPrimaryKeyCodes, source.mPrimaryKeyCodes.length);
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mTypedWord = new StringBuilder(source.mTypedWord);
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mInputPointers.copy(source.mInputPointers);
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mCapsCount = source.mCapsCount;
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mDigitsCount = source.mDigitsCount;
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mIsFirstCharCapitalized = source.mIsFirstCharCapitalized;
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mCapitalizedMode = source.mCapitalizedMode;
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mTrailingSingleQuotesCount = source.mTrailingSingleQuotesCount;
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mIsResumed = source.mIsResumed;
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mIsBatchMode = source.mIsBatchMode;
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mCursorPositionWithinWord = source.mCursorPositionWithinWord;
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mRejectedBatchModeSuggestion = source.mRejectedBatchModeSuggestion;
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refreshSize();
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}
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/**
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* Clear out the keys registered so far.
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*/
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public void reset() {
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mTypedWord.setLength(0);
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mAutoCorrection = null;
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mCapsCount = 0;
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mDigitsCount = 0;
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mIsFirstCharCapitalized = false;
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mTrailingSingleQuotesCount = 0;
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mIsResumed = false;
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mIsBatchMode = false;
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mCursorPositionWithinWord = 0;
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mRejectedBatchModeSuggestion = null;
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refreshSize();
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}
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private final void refreshSize() {
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mCodePointSize = mTypedWord.codePointCount(0, mTypedWord.length());
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}
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/**
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* Number of keystrokes in the composing word.
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* @return the number of keystrokes
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*/
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public final int size() {
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return mCodePointSize;
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}
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public final boolean isComposingWord() {
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return size() > 0;
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}
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// TODO: make sure that the index should not exceed MAX_WORD_LENGTH
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public int getCodeAt(int index) {
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if (index >= MAX_WORD_LENGTH) {
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return -1;
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}
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return mPrimaryKeyCodes[index];
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}
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public int getCodeBeforeCursor() {
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if (mCursorPositionWithinWord < 1 || mCursorPositionWithinWord > mPrimaryKeyCodes.length) {
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return Constants.NOT_A_CODE;
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}
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return mPrimaryKeyCodes[mCursorPositionWithinWord - 1];
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}
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public InputPointers getInputPointers() {
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return mInputPointers;
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}
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private static boolean isFirstCharCapitalized(final int index, final int codePoint,
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final boolean previous) {
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if (index == 0) return Character.isUpperCase(codePoint);
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return previous && !Character.isUpperCase(codePoint);
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}
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/**
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* Add a new keystroke, with the pressed key's code point with the touch point coordinates.
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*/
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public void add(final int primaryCode, final int keyX, final int keyY) {
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final int newIndex = size();
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mTypedWord.appendCodePoint(primaryCode);
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refreshSize();
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mCursorPositionWithinWord = mCodePointSize;
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if (newIndex < MAX_WORD_LENGTH) {
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mPrimaryKeyCodes[newIndex] = primaryCode >= Constants.CODE_SPACE
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? Character.toLowerCase(primaryCode) : primaryCode;
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// In the batch input mode, the {@code mInputPointers} holds batch input points and
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// shouldn't be overridden by the "typed key" coordinates
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// (See {@link #setBatchInputWord}).
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if (!mIsBatchMode) {
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// TODO: Set correct pointer id and time
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mInputPointers.addPointer(newIndex, keyX, keyY, 0, 0);
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}
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}
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mIsFirstCharCapitalized = isFirstCharCapitalized(
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newIndex, primaryCode, mIsFirstCharCapitalized);
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if (Character.isUpperCase(primaryCode)) mCapsCount++;
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if (Character.isDigit(primaryCode)) mDigitsCount++;
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if (Constants.CODE_SINGLE_QUOTE == primaryCode) {
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++mTrailingSingleQuotesCount;
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} else {
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mTrailingSingleQuotesCount = 0;
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}
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mAutoCorrection = null;
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}
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public void setCursorPositionWithinWord(final int posWithinWord) {
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mCursorPositionWithinWord = posWithinWord;
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}
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public boolean isCursorFrontOrMiddleOfComposingWord() {
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if (DBG && mCursorPositionWithinWord > mCodePointSize) {
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throw new RuntimeException("Wrong cursor position : " + mCursorPositionWithinWord
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+ "in a word of size " + mCodePointSize);
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}
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return mCursorPositionWithinWord != mCodePointSize;
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}
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/**
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* When the cursor is moved by the user, we need to update its position.
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* If it falls inside the currently composing word, we don't reset the composition, and
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* only update the cursor position.
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*
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* @param expectedMoveAmount How many java chars to move the cursor. Negative values move
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* the cursor backward, positive values move the cursor forward.
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* @return true if the cursor is still inside the composing word, false otherwise.
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*/
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public boolean moveCursorByAndReturnIfInsideComposingWord(final int expectedMoveAmount) {
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int actualMoveAmountWithinWord = 0;
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int cursorPos = mCursorPositionWithinWord;
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final int[] codePoints;
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if (mCodePointSize >= MAX_WORD_LENGTH) {
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// If we have more than MAX_WORD_LENGTH characters, we don't have everything inside
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// mPrimaryKeyCodes. This should be rare enough that we can afford to just compute
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// the array on the fly when this happens.
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codePoints = StringUtils.toCodePointArray(mTypedWord.toString());
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} else {
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codePoints = mPrimaryKeyCodes;
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}
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if (expectedMoveAmount >= 0) {
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// Moving the cursor forward for the expected amount or until the end of the word has
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// been reached, whichever comes first.
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while (actualMoveAmountWithinWord < expectedMoveAmount && cursorPos < mCodePointSize) {
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actualMoveAmountWithinWord += Character.charCount(codePoints[cursorPos]);
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++cursorPos;
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}
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} else {
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// Moving the cursor backward for the expected amount or until the start of the word
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// has been reached, whichever comes first.
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while (actualMoveAmountWithinWord > expectedMoveAmount && cursorPos > 0) {
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--cursorPos;
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actualMoveAmountWithinWord -= Character.charCount(codePoints[cursorPos]);
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}
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}
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// If the actual and expected amounts differ, we crossed the start or the end of the word
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// so the result would not be inside the composing word.
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if (actualMoveAmountWithinWord != expectedMoveAmount) return false;
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mCursorPositionWithinWord = cursorPos;
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return true;
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}
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public void setBatchInputPointers(final InputPointers batchPointers) {
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mInputPointers.set(batchPointers);
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mIsBatchMode = true;
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}
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public void setBatchInputWord(final String word) {
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reset();
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mIsBatchMode = true;
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final int length = word.length();
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for (int i = 0; i < length; i = Character.offsetByCodePoints(word, i, 1)) {
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final int codePoint = Character.codePointAt(word, i);
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// We don't want to override the batch input points that are held in mInputPointers
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// (See {@link #add(int,int,int)}).
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add(codePoint, Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
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}
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}
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/**
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* Add a dummy key by retrieving reasonable coordinates
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*/
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public void addKeyInfo(final int codePoint, final Keyboard keyboard) {
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final int x, y;
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final Key key;
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if (keyboard != null && (key = keyboard.getKey(codePoint)) != null) {
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x = key.getX() + key.getWidth() / 2;
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y = key.getY() + key.getHeight() / 2;
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} else {
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x = Constants.NOT_A_COORDINATE;
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y = Constants.NOT_A_COORDINATE;
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}
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add(codePoint, x, y);
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}
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/**
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* Set the currently composing word to the one passed as an argument.
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* This will register NOT_A_COORDINATE for X and Ys, and use the passed keyboard for proximity.
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*/
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public void setComposingWord(final CharSequence word, final Keyboard keyboard) {
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reset();
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final int length = word.length();
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for (int i = 0; i < length; i = Character.offsetByCodePoints(word, i, 1)) {
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final int codePoint = Character.codePointAt(word, i);
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addKeyInfo(codePoint, keyboard);
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}
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mIsResumed = true;
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}
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/**
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* Delete the last keystroke as a result of hitting backspace.
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*/
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public void deleteLast() {
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final int size = size();
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if (size > 0) {
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// Note: mTypedWord.length() and mCodes.length differ when there are surrogate pairs
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final int stringBuilderLength = mTypedWord.length();
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if (stringBuilderLength < size) {
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throw new RuntimeException(
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"In WordComposer: mCodes and mTypedWords have non-matching lengths");
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}
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final int lastChar = mTypedWord.codePointBefore(stringBuilderLength);
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if (Character.isSupplementaryCodePoint(lastChar)) {
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mTypedWord.delete(stringBuilderLength - 2, stringBuilderLength);
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} else {
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mTypedWord.deleteCharAt(stringBuilderLength - 1);
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}
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if (Character.isUpperCase(lastChar)) mCapsCount--;
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if (Character.isDigit(lastChar)) mDigitsCount--;
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refreshSize();
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}
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// We may have deleted the last one.
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if (0 == size()) {
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mIsFirstCharCapitalized = false;
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}
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if (mTrailingSingleQuotesCount > 0) {
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--mTrailingSingleQuotesCount;
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} else {
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int i = mTypedWord.length();
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while (i > 0) {
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i = mTypedWord.offsetByCodePoints(i, -1);
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if (Constants.CODE_SINGLE_QUOTE != mTypedWord.codePointAt(i)) break;
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++mTrailingSingleQuotesCount;
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}
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}
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mCursorPositionWithinWord = mCodePointSize;
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mAutoCorrection = null;
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}
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/**
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* Returns the word as it was typed, without any correction applied.
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* @return the word that was typed so far. Never returns null.
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*/
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public String getTypedWord() {
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return mTypedWord.toString();
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}
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/**
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* Whether or not the user typed a capital letter as the first letter in the word
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* @return capitalization preference
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*/
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public boolean isFirstCharCapitalized() {
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return mIsFirstCharCapitalized;
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}
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public int trailingSingleQuotesCount() {
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return mTrailingSingleQuotesCount;
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}
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/**
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* Whether or not all of the user typed chars are upper case
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* @return true if all user typed chars are upper case, false otherwise
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*/
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public boolean isAllUpperCase() {
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if (size() <= 1) {
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return mCapitalizedMode == CAPS_MODE_AUTO_SHIFT_LOCKED
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|| mCapitalizedMode == CAPS_MODE_MANUAL_SHIFT_LOCKED;
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} else {
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return mCapsCount == size();
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}
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}
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public boolean wasShiftedNoLock() {
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return mCapitalizedMode == CAPS_MODE_AUTO_SHIFTED
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|| mCapitalizedMode == CAPS_MODE_MANUAL_SHIFTED;
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}
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/**
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* Returns true if more than one character is upper case, otherwise returns false.
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*/
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public boolean isMostlyCaps() {
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return mCapsCount > 1;
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}
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/**
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* Returns true if we have digits in the composing word.
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*/
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public boolean hasDigits() {
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return mDigitsCount > 0;
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}
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/**
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* Saves the caps mode at the start of composing.
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*
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* WordComposer needs to know about this for several reasons. The first is, we need to know
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* after the fact what the reason was, to register the correct form into the user history
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* dictionary: if the word was automatically capitalized, we should insert it in all-lower
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* case but if it's a manual pressing of shift, then it should be inserted as is.
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* Also, batch input needs to know about the current caps mode to display correctly
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* capitalized suggestions.
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* @param mode the mode at the time of start
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*/
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public void setCapitalizedModeAtStartComposingTime(final int mode) {
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mCapitalizedMode = mode;
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}
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/**
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* Returns whether the word was automatically capitalized.
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* @return whether the word was automatically capitalized
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*/
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public boolean wasAutoCapitalized() {
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return mCapitalizedMode == CAPS_MODE_AUTO_SHIFT_LOCKED
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|| mCapitalizedMode == CAPS_MODE_AUTO_SHIFTED;
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}
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/**
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* Sets the auto-correction for this word.
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*/
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public void setAutoCorrection(final String correction) {
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mAutoCorrection = correction;
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}
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/**
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* @return the auto-correction for this word, or null if none.
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*/
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public String getAutoCorrectionOrNull() {
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return mAutoCorrection;
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}
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/**
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* @return whether we started composing this word by resuming suggestion on an existing string
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*/
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public boolean isResumed() {
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return mIsResumed;
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}
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// `type' should be one of the LastComposedWord.COMMIT_TYPE_* constants above.
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public LastComposedWord commitWord(final int type, final String committedWord,
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final String separatorString, final String prevWord) {
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// Note: currently, we come here whenever we commit a word. If it's a MANUAL_PICK
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// or a DECIDED_WORD we may cancel the commit later; otherwise, we should deactivate
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// the last composed word to ensure this does not happen.
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final int[] primaryKeyCodes = mPrimaryKeyCodes;
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mPrimaryKeyCodes = new int[MAX_WORD_LENGTH];
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final LastComposedWord lastComposedWord = new LastComposedWord(primaryKeyCodes,
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mInputPointers, mTypedWord.toString(), committedWord, separatorString,
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prevWord, mCapitalizedMode);
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mInputPointers.reset();
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if (type != LastComposedWord.COMMIT_TYPE_DECIDED_WORD
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&& type != LastComposedWord.COMMIT_TYPE_MANUAL_PICK) {
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lastComposedWord.deactivate();
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}
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mCapsCount = 0;
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mDigitsCount = 0;
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mIsBatchMode = false;
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mTypedWord.setLength(0);
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mCodePointSize = 0;
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mTrailingSingleQuotesCount = 0;
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mIsFirstCharCapitalized = false;
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mCapitalizedMode = CAPS_MODE_OFF;
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refreshSize();
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mAutoCorrection = null;
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mCursorPositionWithinWord = 0;
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mIsResumed = false;
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mRejectedBatchModeSuggestion = null;
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return lastComposedWord;
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}
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public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord) {
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mPrimaryKeyCodes = lastComposedWord.mPrimaryKeyCodes;
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mInputPointers.set(lastComposedWord.mInputPointers);
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mTypedWord.setLength(0);
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mTypedWord.append(lastComposedWord.mTypedWord);
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refreshSize();
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mCapitalizedMode = lastComposedWord.mCapitalizedMode;
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mAutoCorrection = null; // This will be filled by the next call to updateSuggestion.
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mCursorPositionWithinWord = mCodePointSize;
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mRejectedBatchModeSuggestion = null;
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mIsResumed = true;
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}
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public boolean isBatchMode() {
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return mIsBatchMode;
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}
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public void setRejectedBatchModeSuggestion(final String rejectedSuggestion) {
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mRejectedBatchModeSuggestion = rejectedSuggestion;
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}
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public String getRejectedBatchModeSuggestion() {
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return mRejectedBatchModeSuggestion;
|
|
}
|
|
}
|