mcs/class/System.XML/System.Xml/XmlParserInput.cs

   1 //
   2 // System.Xml.XmlParserInput
   3 //
   4 // Author:
   5 //      Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
   6 //
   7 //      (C)2003 Atsushi Enomoto
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30 using System;
  31 using System.Collections;
  32 using System.IO;
  33 using System.Text;
  34 using System.Xml;
  35 using System.Globalization;
  36 using Mono.Xml;
  37
  38 namespace System.Xml
  39 {
  40         internal class XmlParserInput
  41         {
  42                 class XmlParserInputSource
  43                 {
  44                         public readonly string BaseURI;
  45                         readonly TextReader reader;
  46                         public int state;
  47                         public bool isPE;
  48                         int line;
  49                         int column;
  50
  51                         public XmlParserInputSource (
  52                                 TextReader reader, string baseUri, bool pe,
  53                                 int line, int column)
  54                         {
  55                                 BaseURI = baseUri;
  56                                 this.reader = reader;
  57                                 this.isPE = pe;
  58                                 this.line = line;
  59                                 this.column = column;
  60                         }
  61
  62                         public int LineNumber {
  63                                 get { return line; }
  64                         }
  65
  66                         public int LinePosition {
  67                                 get { return column; }
  68                         }
  69
  70                         public void Close ()
  71                         {
  72                                 reader.Close ();
  73                         }
  74
  75                         public int Read ()
  76                         {
  77                                 if (state == 2)
  78                                         return -1;
  79                                 if (isPE && state == 0) {
  80                                         state = 1;
  81                                         return ' ';
  82                                 }
  83                                 int v = reader.Read ();
  84
  85                                 if (v == '\n') {
  86                                         line++;
  87                                         column = 1;
  88                                 } else if (v >= 0) {
  89                                         column++;
  90                                 }
  91
  92                                 if (v < 0 && state == 1) {
  93                                         state = 2;
  94                                         return ' ';
  95                                 }
  96                                 return v;
  97                         }
  98                 }
  99
 100                 #region ctor
 101                 public XmlParserInput (TextReader reader, string baseURI)
 102                         : this (reader, baseURI, 1, 0)
 103                 {
 104                 }
 105
 106                 public XmlParserInput (TextReader reader, string baseURI, int line, int column)
 107                 {
 108                         this.source = new XmlParserInputSource (reader, baseURI, false, line, column);
 109                 }
 110                 #endregion
 111
 112                 #region Public Methods
 113                 // Read the next character and compare it against the
 114                 // specified character.
 115                 public void Close ()
 116                 {
 117                         while (sourceStack.Count > 0)
 118                                 ((XmlParserInputSource) sourceStack.Pop ()).Close ();
 119                         source.Close ();
 120                 }
 121
 122                 public void Expect (int expected)
 123                 {
 124                         int ch = ReadChar ();
 125
 126                         if (ch != expected) {
 127                                 throw ReaderError (
 128                                         String.Format (CultureInfo.InvariantCulture,
 129                                                 "expected '{0}' ({1:X}) but found '{2}' ({3:X})",
 130                                                 (char)expected,
 131                                                 expected,
 132                                                 (char)ch,
 133                                                 ch));
 134                         }
 135                 }
 136
 137                 public void Expect (string expected)
 138                 {
 139                         int len = expected.Length;
 140                         for(int i=0; i< len; i++)
 141                                 Expect (expected[i]);
 142                 }
 143
 144                 public void PushPEBuffer (DTDParameterEntityDeclaration pe)
 145                 {
 146                         sourceStack.Push (source);
 147                         source = new XmlParserInputSource (
 148                                 new StringReader (pe.ReplacementText),
 149                                 pe.ActualUri, true, 1, 0);
 150                 }
 151
 152                 private int ReadSourceChar ()
 153                 {
 154                         int v = source.Read ();
 155                         while (v < 0 && sourceStack.Count > 0) {
 156                                 source = sourceStack.Pop () as XmlParserInputSource;
 157                                 v = source.Read ();
 158                         }
 159                         return v;
 160                 }
 161
 162                 public int PeekChar ()
 163                 {
 164                         if (has_peek)
 165                                 return peek_char;
 166
 167                         peek_char = ReadSourceChar ();
 168                         if (peek_char >= 0xD800 && peek_char <= 0xDBFF) {
 169                                 peek_char = 0x10000+((peek_char-0xD800)<<10);
 170                                 int i = ReadSourceChar ();
 171                                 if (i >= 0xDC00 && i <= 0xDFFF)
 172                                         peek_char += (i-0xDC00);
 173                         }
 174                         has_peek = true;
 175                         return peek_char;
 176                 }
 177
 178                 public int ReadChar ()
 179                 {
 180                         int ch;
 181
 182                         ch = PeekChar ();
 183                         has_peek = false;
 184
 185                         return ch;
 186                 }
 187
 188                 #endregion
 189
 190                 #region Public Properties
 191                 public string BaseURI {
 192                         get { return source.BaseURI; }
 193                 }
 194
 195                 public bool HasPEBuffer {
 196                         get { return sourceStack.Count > 0; }
 197                 }
 198
 199                 public int LineNumber {
 200                         get { return source.LineNumber; }
 201                 }
 202
 203                 public int LinePosition {
 204                         get { return source.LinePosition; }
 205                 }
 206
 207                 public bool AllowTextDecl {
 208                         get { return allowTextDecl; }
 209                         set { allowTextDecl = value; }
 210                 }
 211
 212                 #endregion
 213
 214                 #region Privates
 215                 Stack sourceStack = new Stack ();
 216                 XmlParserInputSource source;
 217                 bool has_peek;
 218                 int peek_char;
 219                 bool allowTextDecl = true;
 220
 221                 private XmlException ReaderError (string message)
 222                 {
 223                         return new XmlException (message, null, LineNumber, LinePosition);
 224                 }
 225                 #endregion
 226         }
 227 }