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   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: XMLCDATAScanner.java,v 1.2 2005-05-06 00:55:41 stefanbjarni Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.xml.ui.internal.text;
  15
  16 import java.util.Map;
  17
  18 import net.sourceforge.phpeclipse.xml.ui.text.IXMLSyntaxConstants;
  19
  20 import org.eclipse.jface.text.BadLocationException;
  21 import org.eclipse.jface.text.IDocument;
  22 import org.eclipse.jface.text.rules.IToken;
  23 import org.eclipse.jface.text.rules.ITokenScanner;
  24 import org.eclipse.jface.text.rules.Token;
  25
  26 /**
  27  * @author Igor Malinin
  28  */
  29 public class XMLCDATAScanner implements ITokenScanner {
  30
  31         private Map tokens;
  32
  33         private IDocument document;
  34
  35         private int begin;
  36
  37         private int end;
  38
  39         private int offset;
  40
  41         private int length;
  42
  43         private int position;
  44
  45         public XMLCDATAScanner(Map tokens) {
  46                 this.tokens = tokens;
  47         }
  48
  49         /*
  50          * @see ITokenScanner#setRange(IDocument, int, int)
  51          */
  52         public void setRange(IDocument document, int offset, int length) {
  53                 this.document = document;
  54
  55                 this.begin = offset;
  56                 this.end = offset + length;
  57
  58                 this.offset = offset;
  59                 this.position = offset;
  60                 this.length = 0;
  61         }
  62
  63         /*
  64          * @see ITokenScanner#nextToken()
  65          */
  66         public IToken nextToken() {
  67                 offset += length;
  68
  69                 if (position == begin) {
  70                         position += 3; // <![
  71
  72                         try {
  73                                 if (document.get(position, 6).equals("CDATA[")) {
  74                                         position += 6;
  75                                 }
  76                         } catch (BadLocationException e) {
  77                         }
  78
  79                         return getToken(IXMLSyntaxConstants.XML_CDATA);
  80                 }
  81
  82                 if (position == end) {
  83                         return getToken(null);
  84                 }
  85
  86                 try {
  87                         int p = end - 3;
  88                         if (document.get(p, 3).equals("]]>")) {
  89                                 if (position == p) {
  90                                         position = end;
  91                                         return getToken(IXMLSyntaxConstants.XML_CDATA);
  92                                 }
  93
  94                                 position = p;
  95                         } else {
  96                                 position = end;
  97                         }
  98                 } catch (BadLocationException e) {
  99                 }
 100
 101                 return getToken(IXMLSyntaxConstants.XML_DEFAULT);
 102         }
 103
 104         private IToken getToken(String type) {
 105                 length = position - offset;
 106
 107                 if (length == 0) {
 108                         return Token.EOF;
 109                 }
 110
 111                 if (type == null) {
 112                         return Token.UNDEFINED;
 113                 }
 114
 115                 IToken token = (IToken) tokens.get(type);
 116                 if (token == null) {
 117                         return Token.UNDEFINED;
 118                 }
 119
 120                 return token;
 121         }
 122
 123         /*
 124          * @see ITokenScanner#getTokenOffset()
 125          */
 126         public int getTokenOffset() {
 127                 return offset;
 128         }
 129
 130         /*
 131          * @see ITokenScanner#getTokenLength()
 132          */
 133         public int getTokenLength() {
 134                 return length;
 135         }
 136 }