/*******************************************************************************
* Copyright (c) 2007, 2009 David Green 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:
* David Green - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.wikitext.parser.markup.token;
import org.eclipse.mylyn.wikitext.parser.markup.PatternBasedElement;
import org.eclipse.mylyn.wikitext.parser.markup.PatternBasedElementProcessor;
/**
* A replacement token for segments of text that are delimited by specified text. Useful for replacing delimiting
* characters, for example text wrapped by double quotes could be replaced with the same text delimited by single
* quotes.
*
* @author David Green
* @since 3.0
*/
public class EntityWrappingReplacementToken extends PatternBasedElement {
private final String delimiter;
private final String leftEntity;
private final String rightEntity;
public EntityWrappingReplacementToken(String delimiter, String leftEntity, String rightEntity) {
this.delimiter = delimiter;
this.leftEntity = leftEntity;
this.rightEntity = rightEntity;
if (delimiter.length() != 1) {
throw new IllegalArgumentException(delimiter);
}
}
@Override
public String getPattern(int groupOffset) {
String quoted = Character.isLetterOrDigit(delimiter.charAt(0)) ? delimiter : "\\" + delimiter; //$NON-NLS-1$
return "(?:(?:(?<=\\W)|^)" + quoted + "([^" + quoted + "]+)" + quoted + "(?=\\W))"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
@Override
protected int getPatternGroupCount() {
return 1;
}
@Override
protected PatternBasedElementProcessor newProcessor() {
return new EntityWrappingReplacementTokenProcessor(leftEntity, rightEntity);
}
private static class EntityWrappingReplacementTokenProcessor extends PatternBasedElementProcessor {
private final String leftEntity;
private final String rightEntity;
public EntityWrappingReplacementTokenProcessor(String leftEntity, String rightEntity) {
this.leftEntity = leftEntity;
this.rightEntity = rightEntity;
}
@Override
public void emit() {
String content = group(1);
builder.entityReference(leftEntity);
builder.characters(content);
builder.entityReference(rightEntity);
}
}
}