+
+ // read entity reference from attribute string and if parsable then return the value.
+ private string ReadAttributeValueEntityReference ()
+ {
+ int endEntityPosition = attributeString.IndexOf(';',
+ attributeStringCurrentPosition);
+ string entityName = attributeString.Substring (attributeStringCurrentPosition + 1,
+ endEntityPosition - attributeStringCurrentPosition - 1);
+
+ attributeStringCurrentPosition = endEntityPosition + 1;
+
+ if(entityName [0] == '#') {
+ char c;
+ // character entity
+ if(entityName [1] == 'x') {
+ // hexadecimal
+ c = (char) int.Parse ("0" + entityName.Substring (2),
+ System.Globalization.NumberStyles.HexNumber);
+ } else {
+ // decimal
+ c = (char) int.Parse (entityName.Substring (1));
+ }
+ return c.ToString();
+ }
+ else {
+ switch(entityName)
+ {
+ case "lt": return "<";
+ case "gt": return ">";
+ case "amp": return "&";
+ case "quot": return "\"";
+ case "apos": return "'";
+ default: return null;
+ }
+ }
+ }
+
+ private string ResolveAttributeValue (string unresolved)
+ {
+ if(unresolved == null) return null;
+ StringBuilder resolved = new StringBuilder();
+ int pos = 0;
+
+ int next = unresolved.IndexOf ('&');
+ if(next < 0)
+ return unresolved;
+
+ while(next >= 0) {
+ if(pos < next)
+ resolved.Append (unresolved.Substring (pos, next - pos));// - 1);
+ int endPos = unresolved.IndexOf (';', next+1);
+ string entityName =
+ unresolved.Substring (next + 1, endPos - next - 1);
+ if(entityName [0] == '#') {
+ char c;
+ // character entity
+ if(entityName [1] == 'x') {
+ // hexadecimal
+ c = (char) int.Parse ("0" + entityName.Substring (2),
+ System.Globalization.NumberStyles.HexNumber);
+ } else {
+ // decimal
+ c = (char) int.Parse (entityName.Substring (1));
+ }
+ resolved.Append (c);
+ } else {
+ switch(entityName) {
+ case "lt": resolved.Append ("<"); break;
+ case "gt": resolved.Append (">"); break;
+ case "amp": resolved.Append ("&"); break;
+ case "quot": resolved.Append ("\""); break;
+ case "apos": resolved.Append ("'"); break;
+ // With respect to "Value", MS document is helpless
+ // and the implemention returns inconsistent value
+ // (e.g. XML: "&ent; &ent;" ---> Value: "&ent; &ent;".)
+ default: resolved.Append ("&" + entityName + ";"); break;
+ }
+ }
+ pos = endPos + 1;
+ if(pos > unresolved.Length)
+ break;
+ next = unresolved.IndexOf('&', pos);
+ }
+ resolved.Append (unresolved.Substring(pos));
+
+ return resolved.ToString();
+ }
+
+ #endregion