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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: AbstractDocumentProvider.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 java.io.BufferedInputStream;
  17 import java.io.IOException;
  18 import java.io.InputStream;
  19
  20 import org.eclipse.jface.text.rules.IWhitespaceDetector;
  21
  22 import net.sourceforge.phpeclipse.ui.editor.I18NDocumentProvider;
  23
  24
  25 /**
  26  *
  27  *
  28  * @author Igor Malinin
  29  */
  30 public abstract class AbstractDocumentProvider extends I18NDocumentProvider {
  31         protected IWhitespaceDetector detector = new WhitespaceDetector();
  32
  33         /*
  34          * @see org.eclipse.ui.editors.text.IStorageDocumentProvider#getDefaultEncoding()
  35          */
  36         public String getDefaultEncoding() {
  37                 return "UTF-8";
  38         }
  39
  40         public String getDeclaredEncoding( InputStream in ) throws IOException {
  41                 if ( !in.markSupported() ) {
  42                         in = new BufferedInputStream( in, 512 );
  43                 }
  44
  45                 in.mark( 512 );
  46                 String encoding = super.getDeclaredEncoding( in );
  47                 if ( encoding != null ) {
  48                         return encoding;
  49                 }
  50
  51                 in.reset();
  52
  53                 // check Prolog-Start <?xml
  54                 if ( !skipXMLDecl(in) ) {
  55                         return null;
  56                 }
  57
  58                 // detect 'encoding'
  59                 skipEncoding( in );
  60
  61                 // read encoding
  62                 int delimiter;
  63
  64                 while ( true ) {
  65                         int ch = in.read();
  66                         if ( ch < 0 ) {
  67                                 return null;
  68                         }
  69
  70                         if ( detector.isWhitespace((char) ch) ) {
  71                                 continue;
  72                         }
  73
  74                         if ( ch == '"' || ch == '\'' ) {
  75                                 delimiter = ch;
  76                                 break;
  77                         }
  78
  79                         return null;
  80                 }
  81
  82                 StringBuffer buf = new StringBuffer();
  83
  84                 while ( true ) {
  85                         int ch = in.read();
  86                         if ( ch < 0 ) {
  87                                 return null;
  88                         }
  89
  90                         if ( ch == delimiter ) {
  91                                 break;
  92                         }
  93
  94                         buf.append( (char) ch );
  95                 }
  96
  97                 return buf.toString();
  98         }
  99
 100         private boolean skipXMLDecl( InputStream in ) throws IOException {
 101                 int ch = in.read();
 102                 if ( ch != '<' ) {
 103                         return false;
 104                 }
 105
 106                 ch = in.read();
 107                 if ( ch != '?' ) {
 108                         return false;
 109                 }
 110
 111                 ch = in.read();
 112                 if ( ch != 'x' ) {
 113                         return false;
 114                 }
 115
 116                 ch = in.read();
 117                 if ( ch != 'm' ) {
 118                         return false;
 119                 }
 120
 121                 ch = in.read();
 122                 if ( ch != 'l' ) {
 123                         return false;
 124                 }
 125
 126                 return true;
 127         }
 128
 129         private boolean skipEncoding( InputStream in ) throws IOException {
 130                 int ch = in.read();
 131
 132                 boolean whitespace = false;
 133
 134                 while ( true ) {
 135                         if ( ch < 0 ) {
 136                                 return false;
 137                         }
 138
 139                         if ( detector.isWhitespace((char) ch) ) {
 140                                 ch = in.read();
 141                                 whitespace = true;
 142                                 continue;
 143                         }
 144
 145                         if ( ch == '?' || ch == '<' ) {
 146                                 return false;
 147                         }
 148
 149                         if ( ch != 'e' ) {
 150                                 ch = in.read();
 151                                 whitespace = false;
 152                                 continue;
 153                         }
 154
 155                         if ( !whitespace ) {
 156                                 ch = in.read();
 157                                 continue;
 158                         }
 159
 160                         if ( (ch = in.read()) == 'n' &&
 161                                         (ch = in.read()) == 'c' &&
 162                                         (ch = in.read()) == 'o' &&
 163                                         (ch = in.read()) == 'd' &&
 164                                         (ch = in.read()) == 'i' &&
 165                                         (ch = in.read()) == 'n' &&
 166                                         (ch = in.read()) == 'g' ) {
 167                                 break;
 168                         }
 169
 170                         whitespace = false;
 171                 }
 172
 173                 // '='
 174                 while ( true ) {
 175                         ch = in.read();
 176                         if ( ch < 0 ) {
 177                                 return false;
 178                         }
 179
 180                         if ( detector.isWhitespace((char) ch) ) {
 181                                 continue;
 182                         }
 183
 184                         if ( ch == '=' ) {
 185                                 break;
 186                         }
 187
 188                         return false;
 189                 }
 190
 191                 return true;
 192         }
 193 }