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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.rules;
import org.eclipse.jface.text.Assert;
/**
* An implementation of <code>IRule</code> capable of detecting whitespace.
* A whitespace rule uses a whitespace detector in order to find out which
* characters are whitespace characters.
*
* @see IWhitespaceDetector
*/
public class WhitespaceRule implements IRule {
/** The whitespace detector used by this rule */
protected IWhitespaceDetector fDetector;
/**
* Creates a rule which, with the help of an
* whitespace detector, will return a whitespace
* token when a whitespace is detected.
*
* @param detector the rule's whitespace detector, may not be <code>null</code>
*/
public WhitespaceRule(IWhitespaceDetector detector) {
Assert.isNotNull(detector);
fDetector= detector;
}
/*
* @see IRule#evaluate(ICharacterScanner)
*/
public IToken evaluate(ICharacterScanner scanner) {
int c= scanner.read();
if (fDetector.isWhitespace((char) c)) {
do {
c= scanner.read();
} while (fDetector.isWhitespace((char) c));
scanner.unread();
return Token.WHITESPACE;
} else {
scanner.unread();
return Token.UNDEFINED;
}
}
}
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