net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpeclipse/xml/ui/internal/text/EntityRule.java

   1 /*
   2  * Copyright (c) 2002-2004 Widespace, OU and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     Igor Malinin - initial contribution
  10  *
  11  * $Id: EntityRule.java,v 1.1 2004-09-02 18:28:03 jsurfer Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.xml.ui.internal.text;
  15
  16 import org.eclipse.jface.text.rules.ICharacterScanner;
  17 import org.eclipse.jface.text.rules.IRule;
  18 import org.eclipse.jface.text.rules.IToken;
  19 import org.eclipse.jface.text.rules.Token;
  20
  21 /**
  22  * Rule detecting XML or DTD entities.
  23  *
  24  * @author Igor Malinin
  25  */
  26 public class EntityRule implements IRule {
  27
  28         private static NameDetector detector = new NameDetector();
  29
  30         private char start;
  31
  32         private IToken token;
  33
  34         public EntityRule(char start, IToken token) {
  35                 this.start = start;
  36                 this.token = token;
  37         }
  38
  39         public IToken evaluate(ICharacterScanner scanner) {
  40                 int ch = scanner.read();
  41
  42                 if (ch == start) {
  43                         ch = scanner.read();
  44                         if (ch == ICharacterScanner.EOF) {
  45                                 scanner.unread();
  46                                 return token;
  47                         }
  48                         if (ch == ';') {
  49                                 return token;
  50                         }
  51                         if (!detector.isWordStart((char) ch)) {
  52                                 scanner.unread();
  53                                 return token;
  54                         }
  55
  56                         while (true) {
  57                                 ch = scanner.read();
  58                                 if (ch == ICharacterScanner.EOF) {
  59                                         scanner.unread();
  60                                         return token;
  61                                 }
  62                                 if (ch == ';') {
  63                                         return token;
  64                                 }
  65                                 if (!detector.isWordPart((char) ch)) {
  66                                         scanner.unread();
  67                                         return token;
  68                                 }
  69                         }
  70                 }
  71                 scanner.unread();
  72
  73                 return Token.UNDEFINED;
  74         }
  75 }