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/*
* 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.utils;
import java.util.Locale;
/**
* The status of the current recapitalize process.
*/
public class RecapitalizeStatus {
public static final int NOT_A_RECAPITALIZE_MODE = -1;
public static final int CAPS_MODE_ORIGINAL_MIXED_CASE = 0;
public static final int CAPS_MODE_ALL_LOWER = 1;
public static final int CAPS_MODE_FIRST_WORD_UPPER = 2;
public static final int CAPS_MODE_ALL_UPPER = 3;
// When adding a new mode, don't forget to update the CAPS_MODE_LAST constant.
public static final int CAPS_MODE_LAST = CAPS_MODE_ALL_UPPER;
private static final int[] ROTATION_STYLE = {
CAPS_MODE_ORIGINAL_MIXED_CASE,
CAPS_MODE_ALL_LOWER,
CAPS_MODE_FIRST_WORD_UPPER,
CAPS_MODE_ALL_UPPER
};
private static final int getStringMode(final String string, final int[] sortedSeparators) {
if (StringUtils.isIdenticalAfterUpcase(string)) {
return CAPS_MODE_ALL_UPPER;
} else if (StringUtils.isIdenticalAfterDowncase(string)) {
return CAPS_MODE_ALL_LOWER;
} else if (StringUtils.isIdenticalAfterCapitalizeEachWord(string, sortedSeparators)) {
return CAPS_MODE_FIRST_WORD_UPPER;
} else {
return CAPS_MODE_ORIGINAL_MIXED_CASE;
}
}
/**
* We store the location of the cursor and the string that was there before the recapitalize
* action was done, and the location of the cursor and the string that was there after.
*/
private int mCursorStartBefore;
private String mStringBefore;
private int mCursorStartAfter;
private int mCursorEndAfter;
private int mRotationStyleCurrentIndex;
private boolean mSkipOriginalMixedCaseMode;
private Locale mLocale;
private int[] mSortedSeparators;
private String mStringAfter;
private boolean mIsStarted;
private boolean mIsEnabled = true;
private static final int[] EMPTY_STORTED_SEPARATORS = {};
public RecapitalizeStatus() {
// By default, initialize with dummy values that won't match any real recapitalize.
start(-1, -1, "", Locale.getDefault(), EMPTY_STORTED_SEPARATORS);
stop();
}
public void start(final int cursorStart, final int cursorEnd, final String string,
final Locale locale, final int[] sortedSeparators) {
if (!mIsEnabled) {
return;
}
mCursorStartBefore = cursorStart;
mStringBefore = string;
mCursorStartAfter = cursorStart;
mCursorEndAfter = cursorEnd;
mStringAfter = string;
final int initialMode = getStringMode(mStringBefore, sortedSeparators);
mLocale = locale;
mSortedSeparators = sortedSeparators;
if (CAPS_MODE_ORIGINAL_MIXED_CASE == initialMode) {
mRotationStyleCurrentIndex = 0;
mSkipOriginalMixedCaseMode = false;
} else {
// Find the current mode in the array.
int currentMode;
for (currentMode = ROTATION_STYLE.length - 1; currentMode > 0; --currentMode) {
if (ROTATION_STYLE[currentMode] == initialMode) {
break;
}
}
mRotationStyleCurrentIndex = currentMode;
mSkipOriginalMixedCaseMode = true;
}
mIsStarted = true;
}
public void stop() {
mIsStarted = false;
}
public boolean isStarted() {
return mIsStarted;
}
public void enable() {
mIsEnabled = true;
}
public void disable() {
mIsEnabled = false;
}
public boolean mIsEnabled() {
return mIsEnabled;
}
public boolean isSetAt(final int cursorStart, final int cursorEnd) {
return cursorStart == mCursorStartAfter && cursorEnd == mCursorEndAfter;
}
/**
* Rotate through the different possible capitalization modes.
*/
public void rotate() {
final String oldResult = mStringAfter;
int count = 0; // Protection against infinite loop.
do {
mRotationStyleCurrentIndex = (mRotationStyleCurrentIndex + 1) % ROTATION_STYLE.length;
if (CAPS_MODE_ORIGINAL_MIXED_CASE == ROTATION_STYLE[mRotationStyleCurrentIndex]
&& mSkipOriginalMixedCaseMode) {
mRotationStyleCurrentIndex =
(mRotationStyleCurrentIndex + 1) % ROTATION_STYLE.length;
}
++count;
switch (ROTATION_STYLE[mRotationStyleCurrentIndex]) {
case CAPS_MODE_ORIGINAL_MIXED_CASE:
mStringAfter = mStringBefore;
break;
case CAPS_MODE_ALL_LOWER:
mStringAfter = mStringBefore.toLowerCase(mLocale);
break;
case CAPS_MODE_FIRST_WORD_UPPER:
mStringAfter = StringUtils.capitalizeEachWord(mStringBefore, mSortedSeparators,
mLocale);
break;
case CAPS_MODE_ALL_UPPER:
mStringAfter = mStringBefore.toUpperCase(mLocale);
break;
default:
mStringAfter = mStringBefore;
}
} while (mStringAfter.equals(oldResult) && count < ROTATION_STYLE.length + 1);
mCursorEndAfter = mCursorStartAfter + mStringAfter.length();
}
/**
* Remove leading/trailing whitespace from the considered string.
*/
public void trim() {
final int len = mStringBefore.length();
int nonWhitespaceStart = 0;
for (; nonWhitespaceStart < len;
nonWhitespaceStart = mStringBefore.offsetByCodePoints(nonWhitespaceStart, 1)) {
final int codePoint = mStringBefore.codePointAt(nonWhitespaceStart);
if (!Character.isWhitespace(codePoint)) break;
}
int nonWhitespaceEnd = len;
for (; nonWhitespaceEnd > 0;
nonWhitespaceEnd = mStringBefore.offsetByCodePoints(nonWhitespaceEnd, -1)) {
final int codePoint = mStringBefore.codePointBefore(nonWhitespaceEnd);
if (!Character.isWhitespace(codePoint)) break;
}
// If nonWhitespaceStart >= nonWhitespaceEnd, that means the selection contained only
// whitespace, so we leave it as is.
if ((0 != nonWhitespaceStart || len != nonWhitespaceEnd)
&& nonWhitespaceStart < nonWhitespaceEnd) {
mCursorEndAfter = mCursorStartBefore + nonWhitespaceEnd;
mCursorStartBefore = mCursorStartAfter = mCursorStartBefore + nonWhitespaceStart;
mStringAfter = mStringBefore =
mStringBefore.substring(nonWhitespaceStart, nonWhitespaceEnd);
}
}
public String getRecapitalizedString() {
return mStringAfter;
}
public int getNewCursorStart() {
return mCursorStartAfter;
}
public int getNewCursorEnd() {
return mCursorEndAfter;
}
public int getCurrentMode() {
return ROTATION_STYLE[mRotationStyleCurrentIndex];
}
}
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