LatinIME/java/src/com/android/inputmethod/latin/WordComposer.java

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/*
* Copyright (C) 2008 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;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.KeyDetector;
import com.android.inputmethod.keyboard.Keyboard;
import java.util.Arrays;
/**
* A place to store the currently composing word with information such as adjacent key codes as well
*/
public class WordComposer {
public static final int NOT_A_CODE = KeyDetector.NOT_A_CODE;
public static final int NOT_A_COORDINATE = -1;
private static final int N = BinaryDictionary.MAX_WORD_LENGTH;
private int[] mPrimaryKeyCodes;
private final InputPointers mInputPointers = new InputPointers();
private StringBuilder mTypedWord;
private CharSequence mAutoCorrection;
private boolean mIsResumed;
// Cache these values for performance
private int mCapsCount;
private boolean mAutoCapitalized;
private int mTrailingSingleQuotesCount;
private int mCodePointSize;
/**
* Whether the user chose to capitalize the first char of the word.
*/
private boolean mIsFirstCharCapitalized;
public WordComposer() {
mPrimaryKeyCodes = new int[N];
mTypedWord = new StringBuilder(N);
mAutoCorrection = null;
mTrailingSingleQuotesCount = 0;
mIsResumed = false;
refreshSize();
}
public WordComposer(WordComposer source) {
init(source);
}
public void init(WordComposer source) {
mPrimaryKeyCodes = Arrays.copyOf(source.mPrimaryKeyCodes, source.mPrimaryKeyCodes.length);
mTypedWord = new StringBuilder(source.mTypedWord);
mInputPointers.copy(source.mInputPointers);
mCapsCount = source.mCapsCount;
mIsFirstCharCapitalized = source.mIsFirstCharCapitalized;
mAutoCapitalized = source.mAutoCapitalized;
mTrailingSingleQuotesCount = source.mTrailingSingleQuotesCount;
mIsResumed = source.mIsResumed;
refreshSize();
}
/**
* Clear out the keys registered so far.
*/
public void reset() {
mTypedWord.setLength(0);
mAutoCorrection = null;
mCapsCount = 0;
mIsFirstCharCapitalized = false;
mTrailingSingleQuotesCount = 0;
mIsResumed = false;
refreshSize();
}
private final void refreshSize() {
mCodePointSize = mTypedWord.codePointCount(0, mTypedWord.length());
}
/**
* Number of keystrokes in the composing word.
* @return the number of keystrokes
*/
public final int size() {
return mCodePointSize;
}
public final boolean isComposingWord() {
return size() > 0;
}
// TODO: make sure that the index should not exceed MAX_WORD_LENGTH
public int getCodeAt(int index) {
if (index >= BinaryDictionary.MAX_WORD_LENGTH) {
return -1;
}
return mPrimaryKeyCodes[index];
}
public InputPointers getInputPointers() {
return mInputPointers;
}
private static boolean isFirstCharCapitalized(int index, int codePoint, boolean previous) {
if (index == 0) return Character.isUpperCase(codePoint);
return previous && !Character.isUpperCase(codePoint);
}
/**
* Add a new keystroke, with the pressed key's code point with the touch point coordinates.
*/
public void add(int primaryCode, int keyX, int keyY) {
final int newIndex = size();
mTypedWord.appendCodePoint(primaryCode);
refreshSize();
if (newIndex < BinaryDictionary.MAX_WORD_LENGTH) {
mPrimaryKeyCodes[newIndex] = primaryCode >= Keyboard.CODE_SPACE
? Character.toLowerCase(primaryCode) : primaryCode;
// TODO: Set correct pointer id and time
mInputPointers.addPointer(newIndex, keyX, keyY, 0, 0);
}
mIsFirstCharCapitalized = isFirstCharCapitalized(
newIndex, primaryCode, mIsFirstCharCapitalized);
if (Character.isUpperCase(primaryCode)) mCapsCount++;
if (Keyboard.CODE_SINGLE_QUOTE == primaryCode) {
++mTrailingSingleQuotesCount;
} else {
mTrailingSingleQuotesCount = 0;
}
mAutoCorrection = null;
}
/**
* Internal method to retrieve reasonable proximity info for a character.
*/
private void addKeyInfo(final int codePoint, final Keyboard keyboard) {
final Key key = keyboard.getKey(codePoint);
if (key != null) {
final int x = key.mX + key.mWidth / 2;
final int y = key.mY + key.mHeight / 2;
add(codePoint, x, y);
return;
}
add(codePoint, WordComposer.NOT_A_COORDINATE, WordComposer.NOT_A_COORDINATE);
}
/**
* Set the currently composing word to the one passed as an argument.
* This will register NOT_A_COORDINATE for X and Ys, and use the passed keyboard for proximity.
*/
public void setComposingWord(final CharSequence word, final Keyboard keyboard) {
reset();
final int length = word.length();
for (int i = 0; i < length; i = Character.offsetByCodePoints(word, i, 1)) {
int codePoint = Character.codePointAt(word, i);
addKeyInfo(codePoint, keyboard);
}
mIsResumed = true;
}
/**
* Delete the last keystroke as a result of hitting backspace.
*/
public void deleteLast() {
final int size = size();
if (size > 0) {
// Note: mTypedWord.length() and mCodes.length differ when there are surrogate pairs
final int stringBuilderLength = mTypedWord.length();
if (stringBuilderLength < size) {
throw new RuntimeException(
"In WordComposer: mCodes and mTypedWords have non-matching lengths");
}
final int lastChar = mTypedWord.codePointBefore(stringBuilderLength);
if (Character.isSupplementaryCodePoint(lastChar)) {
mTypedWord.delete(stringBuilderLength - 2, stringBuilderLength);
} else {
mTypedWord.deleteCharAt(stringBuilderLength - 1);
}
if (Character.isUpperCase(lastChar)) mCapsCount--;
refreshSize();
}
// We may have deleted the last one.
if (0 == size()) {
mIsFirstCharCapitalized = false;
}
if (mTrailingSingleQuotesCount > 0) {
--mTrailingSingleQuotesCount;
} else {
int i = mTypedWord.length();
while (i > 0) {
i = mTypedWord.offsetByCodePoints(i, -1);
if (Keyboard.CODE_SINGLE_QUOTE != mTypedWord.codePointAt(i)) break;
++mTrailingSingleQuotesCount;
}
}
mAutoCorrection = null;
}
/**
* Returns the word as it was typed, without any correction applied.
* @return the word that was typed so far. Never returns null.
*/
public String getTypedWord() {
return mTypedWord.toString();
}
/**
* Whether or not the user typed a capital letter as the first letter in the word
* @return capitalization preference
*/
public boolean isFirstCharCapitalized() {
return mIsFirstCharCapitalized;
}
public int trailingSingleQuotesCount() {
return mTrailingSingleQuotesCount;
}
/**
* Whether or not all of the user typed chars are upper case
* @return true if all user typed chars are upper case, false otherwise
*/
public boolean isAllUpperCase() {
return (mCapsCount > 0) && (mCapsCount == size());
}
/**
* Returns true if more than one character is upper case, otherwise returns false.
*/
public boolean isMostlyCaps() {
return mCapsCount > 1;
}
/**
* Saves the reason why the word is capitalized - whether it was automatic or
* due to the user hitting shift in the middle of a sentence.
* @param auto whether it was an automatic capitalization due to start of sentence
*/
public void setAutoCapitalized(boolean auto) {
mAutoCapitalized = auto;
}
/**
* Returns whether the word was automatically capitalized.
* @return whether the word was automatically capitalized
*/
public boolean isAutoCapitalized() {
return mAutoCapitalized;
}
/**
* Sets the auto-correction for this word.
*/
public void setAutoCorrection(final CharSequence correction) {
mAutoCorrection = correction;
}
/**
* @return the auto-correction for this word, or null if none.
*/
public CharSequence getAutoCorrectionOrNull() {
return mAutoCorrection;
}
/**
* @return whether we started composing this word by resuming suggestion on an existing string
*/
public boolean isResumed() {
return mIsResumed;
}
// `type' should be one of the LastComposedWord.COMMIT_TYPE_* constants above.
public LastComposedWord commitWord(final int type, final String committedWord,
final int separatorCode, final CharSequence prevWord) {
// Note: currently, we come here whenever we commit a word. If it's a MANUAL_PICK
// or a DECIDED_WORD we may cancel the commit later; otherwise, we should deactivate
// the last composed word to ensure this does not happen.
final int[] primaryKeyCodes = mPrimaryKeyCodes;
mPrimaryKeyCodes = new int[N];
final LastComposedWord lastComposedWord = new LastComposedWord(primaryKeyCodes,
mInputPointers, mTypedWord.toString(), committedWord, separatorCode,
prevWord);
mInputPointers.reset();
if (type != LastComposedWord.COMMIT_TYPE_DECIDED_WORD
&& type != LastComposedWord.COMMIT_TYPE_MANUAL_PICK) {
lastComposedWord.deactivate();
}
mTypedWord.setLength(0);
refreshSize();
mAutoCorrection = null;
mIsResumed = false;
return lastComposedWord;
}
public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord) {
mPrimaryKeyCodes = lastComposedWord.mPrimaryKeyCodes;
mInputPointers.set(lastComposedWord.mInputPointers);
mTypedWord.setLength(0);
mTypedWord.append(lastComposedWord.mTypedWord);
refreshSize();
mAutoCorrection = null; // This will be filled by the next call to updateSuggestion.
mIsResumed = true;
}
}