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

   1 //\r
   2 // System.Xml.XmlParserInput\r
   3 //\r
   4 // Author:\r
   5 //      Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)\r
   6 //\r
   7 //      (C)2003 Atsushi Enomoto\r
   8 //\r
   9 using System;\r
  10 using System.IO;\r
  11 using System.Text;\r
  12 using System.Xml;\r
  13 using System.Globalization;\r
  14 \r
  15 namespace Mono.Xml.Native\r
  16 {\r
  17         public class XmlParserInput\r
  18         {\r
  19                 #region ctor\r
  20                 public XmlParserInput (TextReader reader, string baseURI)\r
  21                         : this (reader, baseURI, 1, 1)\r
  22                 {\r
  23                 }\r
  24 \r
  25                 public XmlParserInput (TextReader reader, string baseURI, int line, int column)\r
  26                 {\r
  27                         this.reader = reader;\r
  28 \r
  29                         StreamReader sr = reader as StreamReader;\r
  30                         if (sr != null)\r
  31                                 can_seek = sr.BaseStream.CanSeek;\r
  32 \r
  33                         this.line = line;\r
  34                         this.column = column;\r
  35                         this.baseURI = baseURI;\r
  36                 }\r
  37                 #endregion\r
  38 \r
  39                 #region Public Methods\r
  40                 // Read the next character and compare it against the\r
  41                 // specified character.\r
  42                 public void Close ()\r
  43                 {\r
  44                         this.reader.Close ();\r
  45                 }\r
  46 \r
  47                 public void Expect (int expected)\r
  48                 {\r
  49                         int ch = ReadChar ();\r
  50 \r
  51                         if (ch != expected) {\r
  52                                 throw ReaderError (\r
  53                                         String.Format (\r
  54                                                 "expected '{0}' ({1:X}) but found '{2}' ({3:X})",\r
  55                                                 (char)expected,\r
  56                                                 expected,\r
  57                                                 (char)ch,\r
  58                                                 ch));\r
  59                         }\r
  60                 }\r
  61 \r
  62                 public void Expect (string expected)\r
  63                 {\r
  64                         int len = expected.Length;\r
  65                         for(int i=0; i< len; i++)\r
  66                                 Expect (expected[i]);\r
  67                 }\r
  68 \r
  69                 public void InsertParameterEntityBuffer (string value)\r
  70                 {\r
  71                         this.peBuffer.Insert (0, ' ' + value + ' ');\r
  72                         peStored = true;\r
  73                 }\r
  74 \r
  75                 public int PeekChar ()\r
  76                 {\r
  77                         if (peStored)\r
  78                                 return peBuffer [0];\r
  79 \r
  80                         if (can_seek)\r
  81                                 return reader.Peek ();\r
  82 \r
  83                         if (has_peek)\r
  84                                 return peek_char;\r
  85 \r
  86                         peek_char = reader.Read ();\r
  87                         has_peek = true;\r
  88                         return peek_char;\r
  89                 }\r
  90 \r
  91                 public int ReadChar ()\r
  92                 {\r
  93                         int ch;\r
  94 \r
  95                         if (peStored) {\r
  96                                 ch = peBuffer [0];\r
  97                                 peBuffer.Remove (0, 1);\r
  98                                 peStored = peBuffer.Length > 0;\r
  99                                 // I decided not to add character to currentTag with respect to PERef value\r
 100                                 return ch;\r
 101                         }\r
 102 \r
 103                         if (has_peek) {\r
 104                                 ch = peek_char;\r
 105                                 has_peek = false;\r
 106                         } else {\r
 107                                 ch = reader.Read ();\r
 108                         }\r
 109 \r
 110                         if (ch == '\n') {\r
 111                                 line++;\r
 112                                 column = 1;\r
 113                         } else {\r
 114                                 column++;\r
 115                         }\r
 116                         currentMarkup.Append ((char) ch);\r
 117                         return ch;\r
 118                 }\r
 119                 #endregion\r
 120 \r
 121                 #region Public Properties\r
 122                 public string BaseURI {\r
 123                         get { return baseURI; }\r
 124                 }\r
 125 \r
 126                 public StringBuilder CurrentMarkup {\r
 127                         get { return this.currentMarkup; }\r
 128                 }\r
 129 \r
 130                 public bool HasPEBuffer {\r
 131                         get {\r
 132                                 if (!peStored)\r
 133                                         return false;\r
 134                                 else if (peBuffer.ToString ().Trim (XmlChar.WhitespaceChars).Length == 0)\r
 135                                         return false;\r
 136                                 else\r
 137                                         return true;\r
 138                         }\r
 139                 }\r
 140 \r
 141                 public int LineNumber {\r
 142                         get { return line; }\r
 143                 }\r
 144 \r
 145                 public int LinePosition {\r
 146                         get { return column; }\r
 147                 }\r
 148 \r
 149                 public bool InitialState {\r
 150                         get { return initialState; }\r
 151                         set { initialState = value; }\r
 152                 }\r
 153 \r
 154                 #endregion\r
 155 \r
 156                 #region Privates\r
 157                 TextReader reader;\r
 158                 bool can_seek;\r
 159                 bool has_peek;\r
 160                 int peek_char;\r
 161                 int line;\r
 162                 int column;\r
 163                 StringBuilder currentMarkup = new StringBuilder ();\r
 164                 StringBuilder peBuffer = new StringBuilder ();\r
 165                 string baseURI;\r
 166                 bool peStored = false;\r
 167                 bool initialState = true;\r
 168 \r
 169                 private int ParseCharReference (string name)\r
 170                 {\r
 171                         int ret = -1;\r
 172                         if (name.Length > 0 && name [0] == '#') {\r
 173                                 if (name [1] == 'x')\r
 174                                         ret = int.Parse (name.Substring (2, name.Length - 2), NumberStyles.None & NumberStyles.AllowHexSpecifier);\r
 175                                 else\r
 176                                         ret = int.Parse (name.Substring (1, name.Length - 1));\r
 177                         }\r
 178                         return ret;\r
 179                 }\r
 180 \r
 181                 private int ParseKnownEntityReference (string name)\r
 182                 {\r
 183                         switch (name) {\r
 184                         case "quot": return '"';\r
 185                         case "lt": return '<';\r
 186                         case "gt": return '>';\r
 187                         case "amp": return '&';\r
 188                         case "apos": return '\'';\r
 189                         }\r
 190                         return -1;\r
 191                 }\r
 192 \r
 193                 private XmlException ReaderError (string message)\r
 194                 {\r
 195                         return new XmlException (message, null, line, column);\r
 196                 }\r
 197                 #endregion\r
 198         }\r
 199 }\r