/*******************************************************************************
* Copyright (c) 2008, 2012 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.bpel.ui.editors.xpath.rules;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;
/**
* A rule for recognizing a sequence of characters, whatever that
* might be ...
*
* @author Michal Chmielewski (michal.chmielewski@oracle.com)
* @date Nov 17, 2006
*/
public class StringRule implements IRule {
IToken fToken;
String fSequence;
/**
* Return a brand new shiny String Rule ...
*
* @param token
* @param sequence
*/
public StringRule(IToken token, String sequence) {
assert token != null;
fToken = token;
assert sequence != null;
fSequence = sequence;
}
/**
*
* @see org.eclipse.jface.text.rules.IRule#evaluate(org.eclipse.jface.text.rules.ICharacterScanner)
*/
public IToken evaluate(ICharacterScanner scanner) {
int cnt = 0;
for (int i = 0, j = fSequence.length(); i < j; i++) {
int ch = scanner.read();
cnt += 1;
if (ch != fSequence.charAt(i)) {
//
for (int x = 0; x < cnt; x++) {
scanner.unread();
}
return Token.UNDEFINED;
}
}
return fToken;
}
}