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/*******************************************************************************
* 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;
}
}
}
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