1. Re: Short Circuiting
On Thu, 25 Jun 1998 17:33:18 +0700 Andy Kurnia <akur at DELOS.COM> writes:
>>Date: Wed, 24 Jun 1998 17:31:07 -0400
>>From: Robert B Pilkington <bpilkington at JUNO.COM>
>>Subject: Re: Short Circuiting
>>
>>And here's a real solution. :)
>>
>>if match("EOF", s) = 1 then
>
> Ah!!! you found it 
>
> How hard would it be to check if "EOF" is the LAST 3 elements
> in the sequence? Well, what if s = "TestingforEOFhere:EOF"??
if length(s) < 3 then -- Make s at least length() 3
s = repeat(255, 3)
end if
if compare(s[length(s)-3..length(s), "EOF")=0 then
-- Alpha
else
-- Gamma
end if
if s[1] = 255 then
s = s[3..length(s)]
end if
See? :) (Or just use David's safe slicing routine. :)
> What if s is an atom???
David's first example (if length(s) >= 3) would fail if s isn't a
sequence, and s is assumed a sequence here.
If you must, though (this assumes s is an object):
if not sequence(s) then
s = {s}
end if
Problem solved. s is now a sequence. :)
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