[antlr-interest] Loosing hidden tokens

veflings veflings at hotmail.com
Thu Mar 25 03:10:42 PST 2004


I have downloaded the java grammar from the antlr site and have 
filtered the lexer through a TokenStreamHiddenTokenFilter.
The Lexer is set to use antlr.CommonHiddenStreamToken and the parser 
to antlr.CommonASTWithHiddenTokens.

Everything works fine exept in a rule where a node is duplicated with:

getASTFactory().dupTree(theNode)


The duplicated node has the hidden tokens set to null.
Why does this happen and what can I do to prevent it?

Thanks in advance

Henning




 
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