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DefaultPredicateRule.java
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DefaultPredicateRule.java
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/*******************************************************************************
* Copyright (c) 2015 Bruno Medeiros and other Contributors.
* 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:
* Bruno Medeiros - initial API and implementation
*******************************************************************************/
package melnorme.lang.ide.core_text;
import static melnorme.utilbox.core.Assert.AssertNamespace.assertNotNull;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IPredicateRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;
public abstract class DefaultPredicateRule implements IPredicateRule {
protected IToken token;
public DefaultPredicateRule(IToken token) {
this.token = assertNotNull(token);
}
@Override
public IToken getSuccessToken() {
return token;
}
@Override
public IToken evaluate(ICharacterScanner scanner, boolean resume) {
if(resume) {
return Token.UNDEFINED; // Not supported
}
return evaluate(scanner);
}
/* ----------------- helpers ----------------- */
public static boolean consume(char ch, ICharacterScanner scanner) {
int next = scanner.read();
if(next == ch) {
return true;
}
scanner.unread();
return false;
}
protected IToken currentOr(char altA, ICharacterScanner scanner) {
int second = scanner.read();
if(second == altA) {
return getSuccessToken();
}
scanner.unread();
return getSuccessToken();
}
protected IToken currentOr(char altA, char altB, ICharacterScanner scanner) {
int second = scanner.read();
if(second == altA || second == altB) {
return getSuccessToken();
}
scanner.unread();
return getSuccessToken();
}
}