| /******************************************************************************* |
| * 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; |
| |
| /** |
| * Defines the interface for a rule used in the scanning of text for the purpose of |
| * document partitioning or text styling. A predicate rule can only return one single |
| * token after having successfully detected content. This token is called success token. |
| * Also, it also returns a token indicating that this rule has not been successful. |
| * |
| * @see ICharacterScanner |
| * @since 2.0 |
| */ |
| public interface IPredicateRule extends IRule { |
| |
| /** |
| * Returns the success token of this predicate rule. |
| * |
| * @return the success token of this rule |
| */ |
| IToken getSuccessToken(); |
| |
| /** |
| * Evaluates the rule by examining the characters available from |
| * the provided character scanner. The token returned by this rule |
| * returns <code>true</code> when calling <code>isUndefined</code>, |
| * if the text the rule investigated does not match the rule's requirements. Otherwise, |
| * this method returns this rule's success token. If this rules relies on a text pattern |
| * comprising a opening and a closing character sequence this method can also be called |
| * when the scanner is positioned already between the opening and the closing sequence. |
| * In this case, <code>resume</code> must be set to <code>true</code>. |
| * |
| * @param scanner the character scanner to be used by this rule |
| * @param resume indicates that the rule starts working between the opening and the closing character sequence |
| * @return the token computed by the rule |
| */ |
| IToken evaluate(ICharacterScanner scanner, boolean resume); |
| } |