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[REBOL] Re: Parse limitation ?

From: petr:krenzelok:trz:cz at: 8-Oct-2003 16:39

Gabriele Santilli wrote:
>Hi Petr, > >On Wednesday, October 8, 2003, 2:06:58 PM, you wrote: > >PK> I would just like to point out, that 'first directive or tu/thru [a | b >PK> | c] was proposed for parse enahncement some time ago, but then some >PK> parse gurus (e.g. Gabriele) admitted, that parse would have to work >PK> other way internally and that it is not easy achievable (am I right, >PK> Gabriele?) > >The point is, that internally PARSE would be forced to do the >equivalent of: > > [any [a | b | c | skip]] >
ah, but that is char-by-char execution ...
>so even if it could be a bit faster than the above I don't think >it would be of great help. More readable, maybe... so it's >something I could add to compile-rules, if I get some time to work >on it. > >In this particular case, I wouldn't use this construct at all, >since it's much better to have a more complete grammar >
yes, exactly - but I think such grammar to simply achieve what was requested will not be easy for novices. The tool (REBOL) should support our thinking pattern - and the most easy on is to "skip" "to | thru" certain string - no matter what is in between. If someone is up-to writing complete html parser, building DOM object, then maybe we are near seeing rebol based web-browser? :-) -pekr-