| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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.IDocument; |
| |
| |
| /** |
| * Scanner that exclusively uses predicate rules. |
| * @since 2.0 |
| */ |
| public class RuleBasedPartitionScanner extends BufferedRuleBasedScanner implements IPartitionTokenScanner { |
| |
| /** The content type of the partition in which to resume scanning. */ |
| protected String fContentType; |
| /** The offset of the partition inside which to resume. */ |
| protected int fPartitionOffset; |
| |
| |
| /* |
| * @see RuleBasedScanner#setRules(IRule[]) |
| */ |
| public void setRules(IRule[] rules) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /* |
| * @see RuleBasedScanner#setRules(IRule[]) |
| */ |
| public void setPredicateRules(IPredicateRule[] rules) { |
| super.setRules(rules); |
| } |
| |
| /* |
| * @see ITokenScanner#setRange(IDocument, int, int) |
| */ |
| public void setRange(IDocument document, int offset, int length) { |
| setPartialRange(document, offset, length, null, -1); |
| } |
| |
| /* |
| * @see IPartitionTokenScanner#setPartialRange(IDocument, int, int, String, int) |
| */ |
| public void setPartialRange(IDocument document, int offset, int length, String contentType, int partitionOffset) { |
| fContentType= contentType; |
| fPartitionOffset= partitionOffset; |
| if (partitionOffset > -1) { |
| int delta= offset - partitionOffset; |
| if (delta > 0) { |
| super.setRange(document, partitionOffset, length + delta); |
| fOffset= offset; |
| return; |
| } |
| } |
| super.setRange(document, offset, length); |
| } |
| |
| /* |
| * @see ITokenScanner#nextToken() |
| */ |
| public IToken nextToken() { |
| |
| |
| if (fContentType == null || fRules == null) { |
| //don't try to resume |
| return super.nextToken(); |
| } |
| |
| // inside a partition |
| |
| fColumn= UNDEFINED; |
| boolean resume= (fPartitionOffset > -1 && fPartitionOffset < fOffset); |
| fTokenOffset= resume ? fPartitionOffset : fOffset; |
| |
| IPredicateRule rule; |
| IToken token; |
| |
| for (int i= 0; i < fRules.length; i++) { |
| rule= (IPredicateRule) fRules[i]; |
| token= rule.getSuccessToken(); |
| if (fContentType.equals(token.getData())) { |
| token= rule.evaluate(this, resume); |
| if (!token.isUndefined()) { |
| fContentType= null; |
| return token; |
| } |
| } |
| } |
| |
| // haven't found any rule for this type of partition |
| fContentType= null; |
| if (resume) |
| fOffset= fPartitionOffset; |
| return super.nextToken(); |
| } |
| } |