net.sourceforge.phpeclipse.xml.ui/src/net/sourceforge/phpeclipse/xml/ui/internal/text/XMLCDATAScanner.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: XMLCDATAScanner.java,v 1.4 2007-06-03 11:39:00 toshihiro 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
  71                         try {
  72                                 if (document.get(position, 9).equals("<![CDATA[")) {
  73                                         position += 9;
  74                                         return getToken(IXMLSyntaxConstants.XML_CDATA);
  75                                 }
  76                         } catch (BadLocationException e) {
  77                         }
  78
  79                 }
  80
  81                 if (position == end) {
  82                         return getToken(null);
  83                 }
  84
  85                 try {
  86                         int p = end - 3;
  87                         if (document.get(p, 3).equals("]]>")) {
  88                                 if (position == p) {
  89                                         position = end;
  90                                         return getToken(IXMLSyntaxConstants.XML_CDATA);
  91                                 }
  92                                 position = p;
  93                         } else {
  94                                 position = end;
  95                         }
  96                 } catch (BadLocationException e) {
  97                 }
  98
  99                 return getToken(IXMLSyntaxConstants.XML_DEFAULT);
 100         }
 101
 102         private IToken getToken(String type) {
 103                 length = position - offset;
 104
 105                 if (length == 0) {
 106                         return Token.EOF;
 107                 }
 108
 109                 if (type == null) {
 110                         return Token.UNDEFINED;
 111                 }
 112
 113                 IToken token = (IToken) tokens.get(type);
 114                 if (token == null) {
 115                         return Token.UNDEFINED;
 116                 }
 117
 118                 return token;
 119         }
 120
 121         /*
 122          * @see ITokenScanner#getTokenOffset()
 123          */
 124         public int getTokenOffset() {
 125                 return offset;
 126         }
 127
 128         /*
 129          * @see ITokenScanner#getTokenLength()
 130          */
 131         public int getTokenLength() {
 132                 return length;
 133         }
 134 }