G'day all.
On Thu, Aug 28, 2003 at 11:05:52AM +0200, Ketil Z. Malde wrote:
> We already have prefix operators, don't we? I.e., regular functions
> are prefix?
Not really. This:
- sqrt x
Doesn't mean the same thing as this:
negate sqrt x
I think the difficulty is that it's very hard to convert a general
operator grammar into a context-free grammar, particularly if you
can set precedences and associativities at run-time. See, for example:
http://citeseer.nj.nec.com/aasa91precedences.html
Effectively you end up writing a whole other parser just to handle
operators.
Cheers,
Andrew Bromage
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