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Re: XSLT 2.0 courses?

Subject: Re: XSLT 2.0 courses?
From: "Wendell Piez wapiez@xxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 21 Sep 2020 15:43:17 -0000
Re:  XSLT 2.0 courses?
... and of course this can be simplified to

$a, $b[empty($a)], $c[empty(($a,$b))]

can't it?

Cheers again, Wendell


On Mon, Sep 21, 2020 at 11:37 AM Wendell Piez wapiez@xxxxxxxxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> David,
>
> Yup, just like ($a,$b,$c)[1]. Not thinking of the "return all of $a"
> problem.
>
> For that I might (today) write
>
> ( ($a[1] ! $a), ($b[empty($a)][1] ! $b), ($c[empty(($a,$b))][1] ! $c) )
>
> although not before thorough testing, and since it fails the clarity test
> it would have to be commented with a short essay ... so I might also use
> if/then/else, or XSLT.
>
> Cheers, Wendell
>
>
>
> On Mon, Sep 21, 2020 at 10:17 AM David Carlisle d.p.carlisle@xxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>>
>>
>> On Mon, 21 Sep 2020 at 15:08, Wendell Piez wapiez@xxxxxxxxxxxxxxx <
>> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>>> Hi,
>>>
>>> Aside from the name question (I'd maybe like first-available()?) the
>>> question arises, what would be the difference between
>>> first-defined(($a,$b,$c)) and head(($a,$b,$c)) or ($a,$b,$c) => head() as
>>> the case may be?
>>>
>>
>> It would need to be an overloaded function like concat taking any number
>> of arguments so first-defined($a,$b,$c)  if you ,-join the lists first you
>> no longer can return $a if non empty,  head(($a,$b,$c)) is the head of the
>> sequence ($a,$b,$c) which is the flattened sequence of items from $a $b
and
>> $c so would just return the first item in $a not all of $a.
>>
>> David
>>
>>
>>
>>
>>> Cheers, Wendell
>>>
>>>
>>> On Mon, Sep 21, 2020 at 9:41 AM Graydon graydon@xxxxxxxxx <
>>> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>
>>>> On Mon, Sep 21, 2020 at 01:25:56PM -0000, Chris Papademetrious
>>>> christopher.papademetrious@xxxxxxxxxxxx scripsit:
>>>> > Good point. Perhaps this could be handled by chaining them?
>>>> >
>>>> > $a otherwise $b otherwise $c otherwise $default
>>>>
>>>> I think "otherwise" is fine for the pair case!
>>>>
>>>> It's clearer and easier to read than ($a,$b)[1] and it'll be easier to
>>>> search for in documentation.
>>>>
>>>> Chaining otherwise as you propose doesn't strike me as clearer or easier
>>>> to read; the location of the implicit parentheses is extremely important
>>>> in that example and as soon as the values are the least bit complex all
>>>> the parens will likely need to be made explicit.
>>>>
>>>> On the other hand, we've already got a concept of sequence, and commas,
>>>> so ($a,$b,$c,$default) => first-defined()
>>>>
>>>> strikes me as clearer and easier to read than chaining "otherwise".
>>>> Could even add a two-parameter version so the second parameter defines
>>>> how to handle values which are false(). :)
>>>>
>>>> --
>>>> Graydon Saunders  | graydonish@xxxxxxxxx
>>>> CC&s oferC)ode, C0isses swC! mC&g.
>>>> -- Deor  ("That passed, so may this.")
>>>>
>>>>
>>>
>>> --
>>> ...Wendell Piez... ...wendell -at- nist -dot- gov...
>>> ...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org...
>>> ...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...
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>
>
> --
> ...Wendell Piez... ...wendell -at- nist -dot- gov...
> ...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org...
> ...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...
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--
...Wendell Piez... ...wendell -at- nist -dot- gov...
...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org...
...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...

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