[antlr-interest] Tree Grammar Syntax?
parrt at cs.usfca.edu
Thu Aug 7 11:11:05 PDT 2008
yes, but must use subrule at moment not tree ( ^(...) )?
On Aug 6, 2008, at 1:50 AM, Foust wrote:
> The DAR is pretty sparse about the details of using a tree grammar
> for more than anything but the simplest cases of printing some nodes.
> (1) Can subtrees be matched optionally? (Like the T_MODIFIERS
> subtree below)
> stmt : ^(T_REFERENCE IDENTIFIER param? ^(T_MODIFIERS
> modifiers)? n+=IDENTIFIER*) ;
> or is this explicitly forbidden, requiring the subtree expression to
> be broken out into a separate rule?
> (2) How are the * and + expressions accessed? Is the += operator
> used to turn them into an ArrayList, just like in the parser?
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