| /******************************************************************************* |
| * 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.tests; |
| |
| import org.eclipse.equinox.bidi.advanced.IStructuredTextExpert; |
| import org.eclipse.equinox.bidi.custom.StructuredTextCharTypes; |
| import org.eclipse.equinox.bidi.custom.StructuredTextTypeHandler; |
| |
| /** |
| * Handler adapted to processing arithmetic expressions with |
| * a possible right-to-left base direction. |
| */ |
| public class StructuredTextMath extends StructuredTextTypeHandler { |
| 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 StructuredTextMath() { |
| super("+-/*()="); //$NON-NLS-1$ |
| } |
| |
| public int getDirection(IStructuredTextExpert expert, String text) { |
| return getDirection(expert, text, new StructuredTextCharTypes(expert, text)); |
| } |
| |
| /** |
| * @return {@link IStructuredTextExpert#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 IStructuredTextExpert#DIR_LTR DIR_LTR}. |
| */ |
| public int getDirection(IStructuredTextExpert expert, String text, StructuredTextCharTypes charTypes) { |
| String language = expert.getEnvironment().getLanguage(); |
| if (!language.equals("ar")) //$NON-NLS-1$ |
| return IStructuredTextExpert.DIR_LTR; |
| boolean flagAN = false; |
| for (int i = 0; i < text.length(); i++) { |
| byte charType = charTypes.getBidiTypeAt(i); |
| if (charType == AL) |
| return IStructuredTextExpert.DIR_RTL; |
| if (charType == L || charType == R) |
| return IStructuredTextExpert.DIR_LTR; |
| if (charType == AN) |
| flagAN = true; |
| } |
| if (flagAN) |
| return IStructuredTextExpert.DIR_RTL; |
| return IStructuredTextExpert.DIR_LTR; |
| } |
| } |