Re: [xsl] Defensive programming in XSLT using asserts and as="..."

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> > What other ways do you do defensive programming in XSLT?
>
>   Didn't I already mention "catch-all" templates?

In fact, I don't believe one can achieve the result of using a catch-all
template with xsl:assert.

xsl:assert can be present only at a location when something is matched ...
thus if a given match-expression is never matched, there is no way to add
an xsl:assert for this "no match"

Thanks,
Dimitre

On Fri, May 6, 2022 at 9:05 AM Dimitre Novatchev <dnovatchev@xxxxxxxxx>
wrote:

> > What other ways do you do defensive programming in XSLT?
>
> Didn't I already mention "catch-all" templates?
>
> Thanks,
> Dimitre
>
> On Fri, May 6, 2022 at 7:16 AM Roger L Costello costello@xxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Hi Folks,
>>
>> I just love the xsl:assert statement!
>>
>> I am going wild with it.
>>
>> I am peppering asserts through my XSLT program. Already I have caught a
>> bunch of errors that would otherwise have been missed.
>>
>> It dawned on me that there are other mechanisms in XSLT that perform
>> "implicit asserts":
>>
>> <xsl:param name="item" as="element(author)"/>
>>
>> is equivalent to:
>>
>> <xsl:param name="item"/>
>> <xsl:assert test="name($item) eq 'author'"/>
>>
>> And this:
>>
>> <xsl:variable name="item" select="..." as="element(author)+" />
>>
>> is equivalent to:
>>
>> <xsl:variable name="item" select="..." />
>> <xsl:assert test="count($item) ge 1" />
>>
>> What other mechanisms are there in XSLT that effectively perform implicit
>> asserts?
>>
>> What other ways do you do defensive programming in XSLT?
>>
>> /Roger
>> 
>>
>>
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> To avoid situations in which you might make mistakes may be the
> biggest mistake of all
> ------------------------------------
> Quality means doing it right when no one is looking.
> -------------------------------------
> You've achieved success in your field when you don't know whether what
> you're doing is work or play
> -------------------------------------
> To achieve the impossible dream, try going to sleep.
> -------------------------------------
> Facts do not cease to exist because they are ignored.
> -------------------------------------
> Typing monkeys will write all Shakespeare's works in 200yrs.Will they
> write all patents, too? :)
> -------------------------------------
> Sanity is madness put to good use.
> -------------------------------------
> I finally figured out the only reason to be alive is to enjoy it.
>
>


-- 
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they write
all patents, too? :)
-------------------------------------
Sanity is madness put to good use.
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.