[antlr-interest] Tree parser eats up DOWN node when navigating optional child node

Junkman j at junkwallah.org
Wed Aug 4 17:21:33 PDT 2010


Gerald Rosenberg wrote:
>  As best I understand your questions, the answers are no, no, and no . . .
> 
> Given an input "PAB", your given parser will construct an AST  ^( ^(
> PARENT A ) B ) and your given tree grammar will likewise match that.
> 

Actually, I don't think I understood you.

You wrote "AST ^( ^( PARENT A ) B )".  Can you describe the tree this
notates?  I can see it as a node sequence, but I don't know what tree
structure it is describing.

Thanks for the reply.

Jay


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