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/*******************************************************************************
* Copyright (c) 2000, 2008 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.jface.text;
import org.eclipse.core.runtime.Assert;
/**
* Standard implementation of a generic
* {@link org.eclipse.jface.text.ILineTracker}.
* <p>
* The line tracker can be configured with the set of legal line delimiters.
* Line delimiters are unconstrained. The line delimiters are used to compute
* the tracker's line structure. In the case of overlapping line delimiters, the
* longest line delimiter is given precedence of the shorter ones.
* <p>
* This class is not intended to be subclassed.
* </p>
* @noextend This class is not intended to be subclassed by clients.
*/
public class ConfigurableLineTracker extends AbstractLineTracker {
/** The strings which are considered being the line delimiter */
private String[] fDelimiters;
/** A predefined delimiter information which is always reused as return value */
private DelimiterInfo fDelimiterInfo= new DelimiterInfo();
/**
* Creates a standard line tracker for the given line delimiters.
*
* @param legalLineDelimiters the tracker's legal line delimiters,
* may not be <code>null</code> and must be longer than 0
*/
public ConfigurableLineTracker(String[] legalLineDelimiters) {
Assert.isTrue(legalLineDelimiters != null && legalLineDelimiters.length > 0);
fDelimiters= TextUtilities.copy(legalLineDelimiters);
}
@Override
public String[] getLegalLineDelimiters() {
return TextUtilities.copy(fDelimiters);
}
@Override
protected DelimiterInfo nextDelimiterInfo(String text, int offset) {
if (fDelimiters.length > 1) {
int[] info= TextUtilities.indexOf(fDelimiters, text, offset);
if (info[0] == -1)
return null;
fDelimiterInfo.delimiterIndex= info[0];
fDelimiterInfo.delimiter= fDelimiters[info[1]];
} else {
int index= text.indexOf(fDelimiters[0], offset);
if (index == -1)
return null;
fDelimiterInfo.delimiterIndex= index;
fDelimiterInfo.delimiter= fDelimiters[0];
}
fDelimiterInfo.delimiterLength= fDelimiterInfo.delimiter.length();
return fDelimiterInfo;
}
}
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