xsl-list
[Top] [All Lists]

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

2022-05-06 11:06:23
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(_at_)mitre(_dot_)org <
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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.
--~----------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
EasyUnsubscribe: http://lists.mulberrytech.com/unsub/xsl-list/1167547
or by email: xsl-list-unsub(_at_)lists(_dot_)mulberrytech(_dot_)com
--~--
<Prev in Thread] Current Thread [Next in Thread>