mcs/class/System.XML/System.Xml.Schema/XmlSchemaXPath.cs

   1 // Author: Dwivedi, Ajay kumar\r
   2 //            Adwiv@Yahoo.com\r
   3 using System;\r
   4 using System.Collections;\r
   5 using System.Xml.Serialization;\r
   6 using System.ComponentModel;\r
   7 using System.Xml;\r
   8 using Mono.Xml;\r
   9 using Mono.Xml.Schema;\r
  10 \r
  11 namespace System.Xml.Schema\r
  12 {\r
  13         /// <summary>\r
  14         /// Summary description for XmlSchemaXPath.\r
  15         /// </summary>\r
  16         public class XmlSchemaXPath : XmlSchemaAnnotated\r
  17         {\r
  18                 private string xpath;\r
  19                 XmlNamespaceManager nsmgr;\r
  20                 internal bool isSelector;\r
  21                 XsdIdentityPath [] compiledExpression;\r
  22 \r
  23                 XsdIdentityPath currentPath;\r
  24 \r
  25                 public XmlSchemaXPath()\r
  26                 {\r
  27                 }\r
  28                 [DefaultValue(null)]\r
  29                 [System.Xml.Serialization.XmlAttribute("xpath")]\r
  30                 public string XPath \r
  31                 {\r
  32                         get{ return  xpath; } \r
  33                         set{ xpath = value; }\r
  34                 }\r
  35 \r
  36                 internal override int Compile(ValidationEventHandler h, XmlSchema schema)\r
  37                 {\r
  38                         // If this is already compiled this time, simply skip.\r
  39                         if (this.IsComplied (schema.CompilationId))\r
  40                                 return 0;\r
  41 \r
  42                         if (nsmgr == null) {\r
  43                                 nsmgr = new XmlNamespaceManager (new NameTable ());\r
  44                                 if (Namespaces != null)\r
  45                                         foreach (XmlQualifiedName qname in Namespaces.ToArray ())\r
  46                                                 nsmgr.AddNamespace (qname.Name, qname.Namespace);\r
  47                         }\r
  48 \r
  49                         currentPath = new XsdIdentityPath ();\r
  50                         ParseExpression (xpath, h, schema);\r
  51 \r
  52                         XmlSchemaUtil.CompileID(Id, this, schema.IDCollection, h);\r
  53                         this.CompilationId = schema.CompilationId;\r
  54                         return errorCount;\r
  55                 }\r
  56 \r
  57                 internal XsdIdentityPath [] CompiledExpression {\r
  58                         get { return compiledExpression; }\r
  59                 }\r
  60 \r
  61                 private void ParseExpression (string xpath, ValidationEventHandler h, XmlSchema schema)\r
  62                 {\r
  63                         ArrayList paths = new ArrayList ();\r
  64                         ParsePath (xpath, 0, paths, h, schema);\r
  65                         this.compiledExpression = (XsdIdentityPath []) paths.ToArray (typeof (XsdIdentityPath));\r
  66                 }\r
  67 \r
  68                 private void ParsePath (string xpath, int pos, ArrayList paths,\r
  69                         ValidationEventHandler h, XmlSchema schema)\r
  70                 {\r
  71                         pos = SkipWhitespace (xpath, pos);\r
  72                         if (xpath.Length >= pos + 3 && xpath [pos] == '.') {\r
  73                                 int tmp = pos;\r
  74                                 pos++;\r
  75                                 pos = SkipWhitespace (xpath, pos);\r
  76                                 if (xpath.Length > pos + 2 && xpath.IndexOf ("//", pos, 2) == pos) {\r
  77                                         currentPath.Descendants = true;\r
  78                                         pos += 2;\r
  79                                 }\r
  80                                 else\r
  81                                         pos = tmp;      // revert\r
  82                         }\r
  83                         ArrayList al = new ArrayList ();\r
  84                         ParseStep (xpath, pos, al, paths, h, schema);\r
  85                 }\r
  86 \r
  87                 private void ParseStep (string xpath, int pos, ArrayList steps,\r
  88                         ArrayList paths, ValidationEventHandler h, XmlSchema schema)\r
  89                 {\r
  90                         pos = SkipWhitespace (xpath, pos);\r
  91                         if (xpath.Length == pos) {\r
  92                                 error (h, "Empty xpath expression is specified");\r
  93                                 return;\r
  94                         }\r
  95 \r
  96                         XsdIdentityStep step = new XsdIdentityStep ();\r
  97                         switch (xpath [pos]) {\r
  98                         case '@':\r
  99                                 if (isSelector) {\r
 100                                         error (h, "Selector cannot include attribute axes.");\r
 101                                         currentPath = null;\r
 102                                         return;\r
 103                                 }\r
 104                                 pos++;\r
 105                                 step.IsAttribute = true;\r
 106                                 pos = SkipWhitespace (xpath, pos);\r
 107                                 if (xpath.Length > pos && xpath [pos] == '*') {\r
 108                                         pos++;\r
 109                                         step.IsAnyName = true;\r
 110                                         break;\r
 111                                 }\r
 112                                 goto default;\r
 113                         case '.':\r
 114                                 pos++;  // do nothing ;-)\r
 115                                 step.IsCurrent = true;\r
 116                                 break;\r
 117                         case '*':\r
 118                                 pos++;\r
 119                                 step.IsAnyName = true;\r
 120                                 break;\r
 121                         case 'c':\r
 122                                 if (xpath.Length > pos + 5 && xpath.IndexOf ("child", pos, 5) == pos) {\r
 123                                         int tmp = pos;\r
 124                                         pos += 5;\r
 125                                         pos = SkipWhitespace (xpath, pos);\r
 126                                         if (xpath.Length > pos && xpath [pos] == ':' && xpath [pos+1] == ':') {\r
 127                                                 pos += 2;\r
 128                                                 if (xpath.Length > pos && xpath [pos] == '*') {\r
 129                                                         pos++;\r
 130                                                         step.IsAnyName = true;\r
 131                                                         break;\r
 132                                                 }\r
 133                                                 pos = SkipWhitespace (xpath, pos);\r
 134                                         }\r
 135                                         else\r
 136                                                 pos = tmp;\r
 137                                 }\r
 138                                 goto default;\r
 139                         case 'a':\r
 140                                 if (xpath.Length > pos + 9 && xpath.IndexOf ("attribute", pos, 9) == pos) {\r
 141                                         int tmp = pos;\r
 142                                         pos += 9;\r
 143                                         pos = SkipWhitespace (xpath, pos);\r
 144                                         if (xpath.Length > pos && xpath [pos] == ':' && xpath [pos+1] == ':') {\r
 145                                                 if (isSelector) {\r
 146                                                         error (h, "Selector cannot include attribute axes.");\r
 147                                                         currentPath = null;\r
 148                                                         return;\r
 149                                                 }\r
 150                                                 pos += 2;\r
 151                                                 step.IsAttribute = true;\r
 152                                                 if (xpath.Length > pos && xpath [pos] == '*') {\r
 153                                                         pos++;\r
 154                                                         step.IsAnyName = true;\r
 155                                                         break;\r
 156                                                 }\r
 157                                                 pos = SkipWhitespace (xpath, pos);\r
 158                                         }\r
 159                                         else\r
 160                                                 pos = tmp;\r
 161                                 }\r
 162                                 goto default;\r
 163                         default:\r
 164                                 int nameStart = pos;\r
 165                                 while (xpath.Length > pos) {\r
 166                                         if (!XmlChar.IsNCNameChar (xpath [pos]))\r
 167                                                 break;\r
 168                                         else\r
 169                                                 pos++;\r
 170                                 }\r
 171                                 if (pos == nameStart) {\r
 172                                         error (h, "Invalid path format for a field.");\r
 173                                         this.currentPath = null;\r
 174                                         return;\r
 175                                 }\r
 176                                 if (xpath.Length == pos || xpath [pos] != ':')\r
 177                                         step.Name = xpath.Substring (nameStart, pos - nameStart);\r
 178                                 else {\r
 179                                         string prefix = xpath.Substring (nameStart, pos - nameStart);\r
 180                                         pos++;\r
 181                                         if (xpath.Length > pos && xpath [pos] == '*') {\r
 182                                                 string ns = nsmgr.LookupNamespace (prefix);\r
 183                                                 if (ns == null) {\r
 184                                                         error (h, "Specified prefix '" + prefix + "' is not declared.");\r
 185                                                         this.currentPath = null;\r
 186                                                         return;\r
 187                                                 }\r
 188                                                 step.NsName = ns;\r
 189                                                 pos++;\r
 190                                         } else {\r
 191                                                 int localNameStart = pos;\r
 192                                                 while (xpath.Length > pos) {\r
 193                                                         if (!XmlChar.IsNCNameChar (xpath [pos]))\r
 194                                                                 break;\r
 195                                                         else\r
 196                                                                 pos++;\r
 197                                                 }\r
 198                                                 step.Name = xpath.Substring (localNameStart, pos - localNameStart);\r
 199                                                 string ns = nsmgr.LookupNamespace (prefix);\r
 200                                                 if (ns == null) {\r
 201                                                         error (h, "Specified prefix '" + prefix + "' is not declared.");\r
 202                                                         this.currentPath = null;\r
 203                                                         return;\r
 204                                                 }\r
 205                                                 step.Namespace = ns;\r
 206                                         }\r
 207                                 }\r
 208                                 break;\r
 209                         }\r
 210                         if (!step.IsCurrent)    // Current step is meaningless, other than its representation.\r
 211                                 steps.Add (step);\r
 212                         pos = SkipWhitespace (xpath, pos);\r
 213                         if (xpath.Length == pos) {\r
 214                                 currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));\r
 215                                 paths.Add (currentPath);\r
 216                                 return;\r
 217                         }\r
 218                         else if (xpath [pos] == '/') {\r
 219                                 pos++;\r
 220                                 if (step.IsAttribute) {\r
 221                                         error (h, "Unexpected xpath token after Attribute NameTest.");\r
 222                                         this.currentPath = null;\r
 223                                         return;\r
 224                                 }\r
 225                                 this.ParseStep (xpath, pos, steps, paths, h, schema);\r
 226                                 if (currentPath == null) // For ValidationEventHandler\r
 227                                         return;\r
 228                                 currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));\r
 229                         } else if (xpath [pos] == '|') {\r
 230                                 pos++;\r
 231                                 currentPath.OrderedSteps = (XsdIdentityStep []) steps.ToArray (typeof (XsdIdentityStep));\r
 232                                 paths.Add (this.currentPath);\r
 233                                 this.currentPath = new XsdIdentityPath ();\r
 234                                 this.ParsePath (xpath, pos, paths, h, schema);\r
 235                         } else {\r
 236                                 error (h, "Unexpected xpath token after NameTest.");\r
 237                                 this.currentPath = null;\r
 238                                 return;\r
 239                         }\r
 240                 }\r
 241 \r
 242                 private int SkipWhitespace (string xpath, int pos)\r
 243                 {\r
 244                         bool loop = true;\r
 245                         while (loop && xpath.Length > pos) {\r
 246                                 switch (xpath [pos]) {\r
 247                                 case ' ':\r
 248                                 case '\t':\r
 249                                 case '\r':\r
 250                                 case '\n':\r
 251                                         pos++;\r
 252                                         continue;\r
 253                                 default:\r
 254                                         loop = false;\r
 255                                         break;\r
 256                                 }\r
 257                         }\r
 258                         return pos;\r
 259                 }\r
 260 \r
 261                 //<selector \r
 262                 //  id = ID \r
 263                 //  xpath = a subset of XPath expression, see below \r
 264                 //  {any attributes with non-schema namespace . . .}>\r
 265                 //  Content: (annotation?)\r
 266                 //</selector>\r
 267                 internal static XmlSchemaXPath Read(XmlSchemaReader reader, ValidationEventHandler h,string name)\r
 268                 {\r
 269                         XmlSchemaXPath path = new XmlSchemaXPath();\r
 270                         reader.MoveToElement();\r
 271 \r
 272                         if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != name)\r
 273                         {\r
 274                                 error(h,"Should not happen :1: XmlSchemaComplexContentRestriction.Read, name="+reader.Name,null);\r
 275                                 reader.Skip();\r
 276                                 return null;\r
 277                         }\r
 278 \r
 279                         path.LineNumber = reader.LineNumber;\r
 280                         path.LinePosition = reader.LinePosition;\r
 281                         path.SourceUri = reader.BaseURI;\r
 282 \r
 283                         XmlNamespaceManager currentMgr = XmlSchemaUtil.GetParserContext (reader.Reader).NamespaceManager;\r
 284                         if (currentMgr != null) {\r
 285                                 path.nsmgr = new XmlNamespaceManager (reader.NameTable);\r
 286                                 IEnumerator e = currentMgr.GetEnumerator ();\r
 287                                 while (e.MoveNext ()) {\r
 288                                         string prefix = e.Current as string;\r
 289                                         switch (prefix) {\r
 290                                         case "xml":\r
 291                                         case "xmlns":\r
 292                                                 continue;\r
 293                                         default:\r
 294                                                 path.nsmgr.AddNamespace (prefix, currentMgr.LookupNamespace (prefix));\r
 295                                                 break;\r
 296                                         }\r
 297                                 }\r
 298                         }\r
 299 \r
 300                         while(reader.MoveToNextAttribute())\r
 301                         {\r
 302                                 if(reader.Name == "id")\r
 303                                 {\r
 304                                         path.Id = reader.Value;\r
 305                                 }\r
 306                                 else if(reader.Name == "xpath")\r
 307                                 {\r
 308                                         path.xpath = reader.Value;\r
 309                                 }\r
 310                                 else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)\r
 311                                 {\r
 312                                         error(h,reader.Name + " is not a valid attribute for "+name,null);\r
 313                                 }\r
 314                                 else\r
 315                                 {\r
 316                                         XmlSchemaUtil.ReadUnhandledAttribute(reader,path);\r
 317                                 }\r
 318                         }\r
 319 \r
 320                         reader.MoveToElement(); \r
 321                         if(reader.IsEmptyElement)\r
 322                                 return path;\r
 323 \r
 324                         //  Content: (annotation?)\r
 325                         int level = 1;\r
 326                         while(reader.ReadNextElement())\r
 327                         {\r
 328                                 if(reader.NodeType == XmlNodeType.EndElement)\r
 329                                 {\r
 330                                         if(reader.LocalName != name)\r
 331                                                 error(h,"Should not happen :2: XmlSchemaXPath.Read, name="+reader.Name,null);\r
 332                                         break;\r
 333                                 }\r
 334                                 if(level <= 1 && reader.LocalName == "annotation")\r
 335                                 {\r
 336                                         level = 2;      //Only one annotation\r
 337                                         XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);\r
 338                                         if(annotation != null)\r
 339                                                 path.Annotation = annotation;\r
 340                                         continue;\r
 341                                 }\r
 342                                 reader.RaiseInvalidElementError();\r
 343                         }\r
 344                         return path;\r
 345                 }\r
 346 \r
 347         }\r
 348 }