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/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* QNX Software System
* Andrew Ferguson (Symbian)
*******************************************************************************/
package org.eclipse.cdt.ui.text;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.cdt.ui.IPropertyChangeParticipant;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.rules.BufferedRuleBasedScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.util.PropertyChangeEvent;
/**
* Convenience implementation for {@link ICTokenScanner}.
* Subclasses need to initialize scanner rules by calling {@link #setRules(IRule[])} or {@link #setRules(List)}.
* <p>
* Clients may instantiate and extend this class.
* </p>
*
* @since 5.1
*/
public abstract class AbstractCScanner extends BufferedRuleBasedScanner implements ICTokenScanner {
private List<IPropertyChangeParticipant> fParticipants;
final protected ITokenStore fTokenStore;
/**
* Create a new scanner for the given token store with default buffer size.
*
* @param tokenStore
*/
public AbstractCScanner(ITokenStore tokenStore) {
fTokenStore = tokenStore;
fParticipants = new ArrayList<>();
}
/**
* Create a new scanner for the given token store and buffer size.
*
* @param tokenStore
* @param size
*/
public AbstractCScanner(ITokenStore tokenStore, int size) {
this(tokenStore);
setBufferSize(size);
}
protected void addPropertyChangeParticipant(IPropertyChangeParticipant participant) {
fParticipants.add(participant);
}
/**
* Convenience method for setting the scanner rules with a list rather
* than an array.
* @param rules
*/
public final void setRules(List<IRule> rules) {
if (rules == null) {
setRules((IRule[]) null);
} else {
IRule[] result = new IRule[rules.size()];
rules.toArray(result);
setRules(result);
}
}
/*
* @see org.eclipse.jface.text.rules.RuleBasedScanner#nextToken()
*/
@Override
public IToken nextToken() {
fTokenStore.ensureTokensInitialised();
return super.nextToken();
}
public IToken getToken(String key) {
return fTokenStore.getToken(key);
}
public IPreferenceStore getPreferenceStore() {
return fTokenStore.getPreferenceStore();
}
/*
* @see org.eclipse.cdt.ui.IPropertyChangeParticipant#adaptToPreferenceChange(org.eclipse.jface.util.PropertyChangeEvent)
*/
@Override
public void adaptToPreferenceChange(PropertyChangeEvent event) {
if (fTokenStore.affectsBehavior(event)) {
fTokenStore.adaptToPreferenceChange(event);
}
for (IPropertyChangeParticipant propertyChangeParticipant : fParticipants) {
propertyChangeParticipant.adaptToPreferenceChange(event);
}
}
/*
* @see org.eclipse.cdt.ui.IPropertyChangeParticipant#affectsBehavior(org.eclipse.jface.util.PropertyChangeEvent)
*/
@Override
public boolean affectsBehavior(PropertyChangeEvent event) {
boolean result = fTokenStore.affectsBehavior(event);
for (Iterator<IPropertyChangeParticipant> i = fParticipants.iterator(); !result && i.hasNext();) {
result |= (i.next()).affectsBehavior(event);
}
return result;
}
}
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