| /******************************************************************************* |
| * Copyright (c) 2010, 2011 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.equinox.bidi.internal; |
| |
| import org.eclipse.equinox.bidi.advanced.IStructuredTextExpert; |
| import org.eclipse.equinox.bidi.custom.*; |
| |
| /** |
| * A base handler for structured text composed of text segments separated |
| * by separators where the text segments may include delimited parts within |
| * which separators are treated like regular characters and the delimiters |
| * may be escaped. |
| * <p> |
| * This is similar to {@link StructuredTextDelims} except that delimiters can be escaped |
| * using the backslash character. |
| * <ul> |
| * <li>Two consecutive backslashes in a delimited part are treated like |
| * one regular character.</li> |
| * <li>An ending delimiter preceded by an odd number of backslashes is |
| * treated like a regular character within the delimited part.</li> |
| * </ul> |
| * </p> |
| */ |
| public abstract class StructuredTextDelimsEsc extends StructuredTextDelims { |
| |
| public StructuredTextDelimsEsc() { |
| // placeholder |
| } |
| |
| public StructuredTextDelimsEsc(String separator) { |
| super(separator); |
| } |
| |
| /** |
| * Handles the text between start and end delimiters as a token. |
| * This method inserts a directional mark if needed at position |
| * <code>separLocation</code> which corresponds to a start delimiter, |
| * and skips until after the matching end delimiter, |
| * ignoring possibly escaped end delimiters. |
| */ |
| @Override |
| public int processSpecial(IStructuredTextExpert expert, String text, StructuredTextCharTypes charTypes, StructuredTextOffsets offsets, int caseNumber, int separLocation) { |
| StructuredTextTypeHandler.processSeparator(text, charTypes, offsets, separLocation); |
| int location = separLocation + 1; |
| char delim = getDelimiters().charAt((caseNumber * 2) - 1); |
| while (true) { |
| location = text.indexOf(delim, location); |
| if (location < 0) |
| return text.length(); |
| int cnt = 0; |
| for (int i = location - 1; text.charAt(i) == '\\'; i--) { |
| cnt++; |
| } |
| location++; |
| if ((cnt & 1) == 0) |
| return location; |
| } |
| } |
| |
| } |