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/*******************************************************************************
* Copyright (c) 2010, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.equinox.bidi.internal.consumable;
import org.eclipse.equinox.bidi.STextDirection;
import org.eclipse.equinox.bidi.advanced.STextEnvironment;
import org.eclipse.equinox.bidi.custom.STextCharTypes;
import org.eclipse.equinox.bidi.custom.STextProcessor;
/**
* Processor adapted to processing arithmetic expressions with
* a possible right-to-left base direction.
*/
public class STextMath extends STextProcessor {
static final byte L = Character.DIRECTIONALITY_LEFT_TO_RIGHT;
static final byte R = Character.DIRECTIONALITY_RIGHT_TO_LEFT;
static final byte AL = Character.DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC;
static final byte AN = Character.DIRECTIONALITY_ARABIC_NUMBER;
public STextMath() {
super("+-/*()="); //$NON-NLS-1$
}
public int getDirection(STextEnvironment environment, String text) {
return getDirection(environment, text, new STextCharTypes(this, environment, text));
}
/**
* @return {@link STextDirection#DIR_RTL DIR_RTL} if the following
* conditions are satisfied:
* <ul>
* <li>The current locale (as expressed by the environment
* language) is Arabic.</li>
* <li>The first strong character is an Arabic letter.</li>
* <li>If there is no strong character in the text, there is
* at least one Arabic-Indic digit in the text.</li>
* </ul>
* Otherwise, returns {@link STextDirection#DIR_LTR DIR_LTR}.
*/
public int getDirection(STextEnvironment environment, String text, STextCharTypes charTypes) {
String language = environment.getLanguage();
if (!language.equals("ar")) //$NON-NLS-1$
return STextDirection.DIR_LTR;
boolean flagAN = false;
for (int i = 0; i < text.length(); i++) {
byte charType = charTypes.getBidiTypeAt(i);
if (charType == AL)
return STextDirection.DIR_RTL;
if (charType == L || charType == R)
return STextDirection.DIR_LTR;
if (charType == AN)
flagAN = true;
}
if (flagAN)
return STextDirection.DIR_RTL;
return STextDirection.DIR_LTR;
}
}
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