| /******************************************************************************* |
| * Copyright (c) 2009 Red Hat Inc. 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: |
| * Alexander Kurtakov - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.dltk.sh.internal.ui.text; |
| |
| 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.IWordDetector; |
| import org.eclipse.jface.text.rules.Token; |
| |
| public class AssignmentRule implements IRule { |
| private final StringBuffer buffer = new StringBuffer(); |
| private final IToken defaultToken; |
| private final IWordDetector detector; |
| private final IToken successToken; |
| |
| public AssignmentRule(IWordDetector detector, IToken defaultToken, IToken token) { |
| this.detector = detector; |
| this.successToken = token; |
| this.defaultToken = defaultToken; |
| } |
| |
| @Override |
| public IToken evaluate(ICharacterScanner scanner) { |
| char c = (char) scanner.read(); |
| if (detector.isWordStart((c))) { |
| buffer.setLength(0); |
| do { |
| buffer.append((c)); |
| c = (char) scanner.read(); |
| } while ((c != ICharacterScanner.EOF) && detector.isWordPart(c)); |
| scanner.unread(); |
| if (c == '=') { |
| return successToken; |
| } |
| if (defaultToken.isUndefined()) { |
| unreadBuffer(scanner); |
| } |
| return defaultToken; |
| } |
| scanner.unread(); |
| return Token.UNDEFINED; |
| } |
| |
| /** |
| * Returns the characters in the buffer to the scanner. |
| * |
| * @param scanner |
| * the scanner to be used |
| */ |
| protected void unreadBuffer(ICharacterScanner scanner) { |
| for (int i = buffer.length() - 1; i >= 0; i--) { |
| scanner.unread(); |
| } |
| } |
| } |