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.Keyboard;
import com.android.inputmethod.keyboard.KeyDetector;
import java.util.ArrayList;
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;
/**
* The list of unicode values for each keystroke (including surrounding keys)
*/
private ArrayList<int[]> mCodes;
private int[] mXCoordinates;
private int[] mYCoordinates;
private StringBuilder mTypedWord;
private int mCapsCount;
private boolean mAutoCapitalized;
// Cache this value for performance
private boolean mIsLastCharASingleQuote;
/**
* Whether the user chose to capitalize the first char of the word.
*/
private boolean mIsFirstCharCapitalized;
public WordComposer() {
final int N = BinaryDictionary.MAX_WORD_LENGTH;
mCodes = new ArrayList<int[]>(N);
mTypedWord = new StringBuilder(N);
mXCoordinates = new int[N];
mYCoordinates = new int[N];
mIsLastCharASingleQuote = false;
}
public WordComposer(WordComposer source) {
init(source);
}
public void init(WordComposer source) {
mCodes = new ArrayList<int[]>(source.mCodes);
mTypedWord = new StringBuilder(source.mTypedWord);
mXCoordinates = Arrays.copyOf(source.mXCoordinates, source.mXCoordinates.length);
mYCoordinates = Arrays.copyOf(source.mYCoordinates, source.mYCoordinates.length);
mCapsCount = source.mCapsCount;
mIsFirstCharCapitalized = source.mIsFirstCharCapitalized;
mAutoCapitalized = source.mAutoCapitalized;
mIsLastCharASingleQuote = source.mIsLastCharASingleQuote;
}
/**
* Clear out the keys registered so far.
*/
public void reset() {
mCodes.clear();
mTypedWord.setLength(0);
mCapsCount = 0;
mIsFirstCharCapitalized = false;
mIsLastCharASingleQuote = false;
}
/**
* Number of keystrokes in the composing word.
* @return the number of keystrokes
*/
public final int size() {
return mTypedWord.length();
}
/**
* Returns the codes at a particular position in the word.
* @param index the position in the word
* @return the unicode for the pressed and surrounding keys
*/
public int[] getCodesAt(int index) {
return mCodes.get(index);
}
public int[] getXCoordinates() {
return mXCoordinates;
}
public int[] getYCoordinates() {
return mYCoordinates;
}
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 codes[0] containing the pressed key's unicode and the rest of
* the array containing unicode for adjacent keys, sorted by reducing probability/proximity.
* @param codes the array of unicode values
*/
public void add(int primaryCode, int[] codes, int x, int y) {
final int newIndex = size();
mTypedWord.append((char) primaryCode);
correctPrimaryJuxtapos(primaryCode, codes);
mCodes.add(codes);
if (newIndex < BinaryDictionary.MAX_WORD_LENGTH) {
mXCoordinates[newIndex] = x;
mYCoordinates[newIndex] = y;
}
mIsFirstCharCapitalized = isFirstCharCapitalized(
newIndex, primaryCode, mIsFirstCharCapitalized);
if (Character.isUpperCase(primaryCode)) mCapsCount++;
mIsLastCharASingleQuote = Keyboard.CODE_SINGLE_QUOTE == primaryCode;
}
/**
* Swaps the first and second values in the codes array if the primary code is not the first
* value in the array but the second. This happens when the preferred key is not the key that
* the user released the finger on.
* @param primaryCode the preferred character
* @param codes array of codes based on distance from touch point
*/
private static void correctPrimaryJuxtapos(int primaryCode, int[] codes) {
if (codes.length < 2) return;
if (codes[0] > 0 && codes[1] > 0 && codes[0] != primaryCode && codes[1] == primaryCode) {
codes[1] = codes[0];
codes[0] = primaryCode;
}
}
/**
* Delete the last keystroke as a result of hitting backspace.
*/
public void deleteLast() {
final int size = size();
if (size > 0) {
final int lastPos = size - 1;
char lastChar = mTypedWord.charAt(lastPos);
mCodes.remove(lastPos);
mTypedWord.deleteCharAt(lastPos);
if (Character.isUpperCase(lastChar)) mCapsCount--;
}
if (size() == 0) {
mIsFirstCharCapitalized = false;
mIsLastCharASingleQuote = false;
} else {
mIsLastCharASingleQuote =
Keyboard.CODE_SINGLE_QUOTE == mTypedWord.codePointAt(mTypedWord.length() - 1);
}
}
/**
* Returns the word as it was typed, without any correction applied.
* @return the word that was typed so far
*/
public String getTypedWord() {
if (size() == 0) {
return null;
}
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 boolean isLastCharASingleQuote() {
return mIsLastCharASingleQuote;
}
/**
* 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;
}
}