Currently, BaseTreeAdaptor has the following method:
public Object create(int tokenType, Token fromToken, String
text) {
fromToken = createToken(fromToken);
fromToken.setType(tokenType);
fromToken.setText(text);
Tree t = (Tree)create(fromToken);
return t;
}
When a grammar has something like the following (and now I forgot what
exactly caused me to hit this...), and a recoverable error occurs in
parsing, this method could be called with a null fromToken, and the copy
constructor for CommonToken will throw a NullReferenceException (in C#).
The following modification allows recovery by falling back in this case
to the type/text create method.
public Object create(int tokenType, Token fromToken, String
text) {
if (fromToken == null)
return create(tokenType, text);
fromToken = createToken(fromToken);
fromToken.setType(tokenType);
fromToken.setText(text);
Tree t = (Tree)create(fromToken);
return t;
}
Sam
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