private string ExpandAttValue(string s, ref bool fEntityRef, int lineNum, int linePos) {
if (s.Length == 0)
return s;
string code = null;
string msg = null;
char ch;
XmlScanner scanner = _Scanner;
_StringBuilder.Length = 0;
_Scanner = new XmlScanner(s.ToCharArray(), _NameTable, lineNum, linePos);
while (true) {
_Token = _Scanner.ScanLiteral(true, false, false, false);
switch (_Token) {
case XmlToken.EOF:
PopAttValueScanner();
if (_Scanner == null) {
_Scanner = scanner;
return _StringBuilder.ToString();
}
break;
case XmlToken.ENTITYREF:
fEntityRef = true;
_Scanner.InDTD = false;
ch = _Scanner.ScanNamedEntity();
_Scanner.InDTD = true;
if (ch == 0) {
XmlQualifiedName name = new XmlQualifiedName(_Scanner.GetTextAtom());
_Scanner.Advance();
SchemaEntity en = (SchemaEntity)_SchemaInfo.GeneralEntities[name];
if (en != null) {
if (!en.IsExternal) {
if (!en.IsProcessed) {
if (en.Text != null && en.Text != string.Empty) {
PushAttValueScanner(_Scanner, en);
_Scanner = new XmlScanner(en.Text.ToCharArray(), _NameTable, en.Line, en.Pos + 1);
}
}
else {
// well-formness error, see xml spec [68]
code = Res.Xml_RecursiveGenEntity;
msg = name.Name;
goto error;
}
}
else {
// well-formness error, see xml spec [68]
code = Res.Xml_ExternalEntityInAttValue;
msg = name.Name;
goto error;
}
}
else {
// well-formness error, see xml spec [68]
code = Res.Xml_UndeclaredEntity;
msg = name.Name;
if(_IsInternal) {
goto error;
}
else {
SendValidationEvent(code, msg);
}
}
}
else {
_Scanner.Advance();
_StringBuilder.Append(ch);
}
break;
case XmlToken.NUMENTREF:
fEntityRef = true;
_StringBuilder.Append(_Scanner.ScanDecEntity());
break;
case XmlToken.HEXENTREF:
fEntityRef = true;
_StringBuilder.Append(_Scanner.ScanHexEntity());
break;
case XmlToken.TEXT:
_StringBuilder.Append(_Scanner.GetText());
break;
default:
code = Res.Xml_UnexpectedToken;
goto error;
}
}
error:
Debug.Assert(code != null);
throw new XmlException(code, msg, _Scanner.StartLineNum , _Scanner.StartLinePos);
}