Subject: Re: [xsl] XSLT 2.0 courses? From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Mon, 21 Sep 2020 13:56:31 -0000 |
On Mon, 21 Sep 2020 at 14:47, Chris Papademetrious christopher.papademetrious@xxxxxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > I suppose it depends on your background. I use other languages that chain > equal-precedence operators in this fashion. Perl's logical OR operator > comes to mind first - "$a or $b or $c", with short-circuiting evaluation. > Python has a similar short-circuiting OR operator. > > sure but there in perl you are applying "logical or" to singleton values and it's clear what it means. The suggestion here is to allow $a zzz $b zzz $c where $a, $b, $c, are possibly empty sequences including sequences of booleans, so as this thread shows there are multiple essentially arbitrary choices about how you define zzz, in particular what do you do if the first item of $a is false (or 0 or an empty string, which have effective boolean values of false). It is easy to pick a definition and define the behaviour unambiguously but the end result is most likely people get caught out when these edge cases do not behave as they expected. David Although I'm an XSLT novice, so perhaps if my brain were steeped more in > XSLT, its nuances would render this less obvious to me? > > - Chris
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