[antlr-interest] antlr v4 wish list

Jim Idle jimi at temporal-wave.com
Wed Mar 23 08:13:04 PDT 2011


Gary,

> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Gary Miller
> - The ability to have actions on the right side of an ast re-write
> operator.

r: ( alt -> ^(X alt) ) {action} ;


> - A different rule @init that only executes during when not
> backtracking.
>
> - The ability to detect / work with an empty scope.
>   Currently attempts to access an empty scope throws a stack exception
> (in Java)

That's deliberate as it means you have your scope in the wrong place.
Getting to an empty scope is a bug in your grammar and you need it to
abort straight away so that you know how you got there.


Jim


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