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Re: Correct way to test for no match
Subject: Re: Correct way to test for no match
From: Dan Vint <dvint@xxxxxxxxx>
Date: Sun, 04 Oct 2009 09:09:47 -0400
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One other thought on this. The reason it is important to know if I
don't have a match is that there should always be a match and it is
important to report this state. I suppose I could rearrange the code.
I was using the otherwise as the default good condition while I
wanted all the tests to be in the where clauses.
..dan
At 06:58 PM 10/2/2009, you wrote:
At 05:43 PM 10/1/2009, you wrote:
I think you probably want
"ancestor::ipb/figure/subfig/graphic/@boardno=$sht_num" as a
positive test -- this will be true if there is a match (there
exists a graphic/@boardno in that place whose value is $sht_num).
I inherited this stylesheet. After working on this some last night
and today, and looking at this answer, I'm not sure why there is
this convoluted code. If there is a match on the $sht_num it means I
have the value. So I think I can eliminate this test completely and
just use the value.
This path was actually used to find a file path with
unparsed_entity_uri, this was failing because it was getting an
empty string. So I was trying to catch the error before it got to
this function.
Your second attempt can be true only if $sht_num is "", and never
otherwise. (It will also fail if no graphic elements are found on that path.)
So that last statement is what I was trying to test for. What is the
result of a miss match? Is there a way to test for the results of a
match that don't return a result? My two attempts were unable to
trap the result of the test and do anything with it. Is there
something else I should have tried?
---------------------------------------------------------------------------
Danny Vint
Panoramic Photography
http://www.dvint.com
voice: 502-749-6179
---------------------------------------------------------------------------
Danny Vint
Panoramic Photography
http://www.dvint.com
voice: 502-749-6179
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