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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13
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14 module dwtx.jface.text.rules.WhitespaceRule;
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15
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16 import dwt.dwthelper.utils;
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17
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18
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19 import dwtx.core.runtime.Assert;
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20
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21
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22 /**
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23 * An implementation of <code>IRule</code> capable of detecting whitespace.
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24 * A whitespace rule uses a whitespace detector in order to find out which
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25 * characters are whitespace characters.
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26 *
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27 * @see IWhitespaceDetector
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28 */
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29 public class WhitespaceRule : IRule {
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30
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31 /** The whitespace detector used by this rule */
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32 protected IWhitespaceDetector fDetector;
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33
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34 /**
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35 * Creates a rule which, with the help of an
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36 * whitespace detector, will return a whitespace
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37 * token when a whitespace is detected.
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38 *
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39 * @param detector the rule's whitespace detector, may not be <code>null</code>
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40 */
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41 public WhitespaceRule(IWhitespaceDetector detector) {
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42 Assert.isNotNull(detector);
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43 fDetector= detector;
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44 }
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45
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46 /*
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47 * @see IRule#evaluate(ICharacterScanner)
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48 */
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49 public IToken evaluate(ICharacterScanner scanner) {
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50 int c= scanner.read();
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51 if (fDetector.isWhitespace((char) c)) {
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52 do {
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53 c= scanner.read();
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54 } while (fDetector.isWhitespace((char) c));
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55 scanner.unread();
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56 return Token.WHITESPACE;
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57 }
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58
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59 scanner.unread();
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60 return Token.UNDEFINED;
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61 }
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62 }
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