[antlr-interest] Re: dfa-based lexers versus top-down antlr lexers
mrosgood at yahoo.com
Wed May 21 11:26:16 PDT 2003
Hi Terence Parr-
Sorry for the delayed reply.
> I'd like thoughts also from people with *no* experience
> using DFA-based tools like lex/flex. Do ANTLR
> lexers seem "natural"?
I started with ANTLR, so don't know any better. And the expression of
a BNF in an ANTLR grammar seems straightforward.
The only reason I'm learning about DFA and LALR now is because the
interactive parsing algorithms are mostly built on top of lex/yacc.
(I still don't know enough to apply the ideas to LL.)
My needs are simple. In designing a language from scratch, I have the
luxury making it easy for both humans and tools. In other words, when
my ANTLR grammar got weird, I changed the language to make things
simple again. Hopefully I got the balance right.
But your language translation stuff is a whole other world. I don't
envy you. And while I consider "embedded" languages (e.g. SQL within
So I encourage you to make the tools you need to make your own work
easier. The rest of us will draft off your lead. <grin>
Cheers, Jason Osgood / Seattle WA
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