[antlr-interest] Re: a new paper on ANTLR style grammars

[Terence Parr]

On Friday, November 21, 2003, at 01:30  AM, Pete Forman wrote:

> At 2003-11-20 19:53 +0000, lgcraymer wrote:
>> Sorry if I was unclear.  Actions need to execute during a parse only
>> if they affect the parse--you need semantic predicates for that.
>> What you can do is build a list of operations to be executed later.
>
> How about putting an optional second clause into an action that
> unwinds it?
>
> That is less automated than the approaches proposed so far but would
> be simpler to implement and for the user to understand.

Been thinking about this programmer-controlled method...very much in 
antlr's philosophy.

Regardless, I'm hoping that backtracking will be much less required as 
LL-regular will allow infinite lookahead (albeit regular not LL) 
languages.  It will auto-left factor stuff too except in the presence 
of actions. :)

Ter
--
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