[antlr-interest] LPG WAS Retaining comments
Jim Idle
jimi at temporal-wave.com
Wed Mar 12 16:09:50 PDT 2008
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Andy Tripp
> Sent: Wednesday, March 12, 2008 3:55 PM
> To: Terence Parr
> Cc: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] LPG WAS Retaining comments
>
> Hmmm...a tool that automatically produces an "AST" just from an input
> grammar.
> What a novel concept! ;)
>
> But the authors call it an "AST" when in fact it's really just a parse
> tree, not an AST.
> Strange that the authors themselves would make such a mistake - to
> think
> that a parse
> tree might make a reasonable default AST...what a silly mistake.
>
> Don't they realize that building an AST is hard, and no one should be
> able to
> get an AST "for free"? Don't they realize that's not an AST at all, but
> a parse tree, and that
> the *real* AST that this input grammar has asked for is a useful,
> simple, flat, data structure?
>
> Clearly they just don't know what they're talking about and so should
> be ignored.
>
...Good Grief!
Charlie Brown.
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