Trapping <xsl:message>?

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David Birnbaum

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Jun 27, 2020, 6:12:07 PM6/27/20
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Is it possible for a test to trap <xsl:message terminate="yes">? I am able to trap error(), so the functionality is available in a different way, but I do not find any documentation at https://github.com/xspec/xspec/wiki/Writing-Scenarios#testing-dynamic-errors about how to trap an <xsl:message> that is supposed to terminate a transformation.

AirQuick

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Jun 28, 2020, 12:47:22 AM6/28/20
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Yes, you can test <xsl:message terminate="yes">. I added some description to https://github.com/xspec/xspec/wiki/Writing-Scenarios#testing-dynamic-errors . Hope it helps.
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David Birnbaum

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Jun 28, 2020, 3:24:49 PM6/28/20
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Hmm ... my XSLT function contains:

<xsl:if test="$f:window-size mod 2 eq 0 or $f:window-size lt 3">
  <xsl:message terminate="yes" select="concat('Invalid window size: ', $f:window-size, '; window size must be odd integer greater than 3')" />
</xsl:if>


$x:result?err returns:

<pseudo-map xmlns:djb="http://www.obdurodon.org"
            xmlns:f="http://www.obdurodon.org/function-variables">map{"column-number":19,"line-number":126,"module":"file:/Users/djb/repos/plot/lib/plot-lib.xsl","code":Q{http://www.w3.org/2005/xqt-errors}XTMM9000,"value":(),"description":"Processing terminated by xsl:message at line 126 in plot-lib.xsl. Found while atomizing the result of a call to djb:get-weights-scale#3"}</pseudo-map>


$x:result?err?value/text(), then, returns only ().

On Sunday, June 28, 2020 at 12:47:22 AM UTC-4, AirQuick wrote:
Yes, you can test <xsl:message terminate="yes">. I added some description to https://github.com/xspec/xspec/wiki/Writing-Scenarios#testing-dynamic-errors . Hope it helps.

----- Original message -----
From: David Birnbaum <djb...@gmail.com>
Subject: Trapping <xsl:message>?
Date: Sunday, June 28, 2020 05:03

Is it possible for a test to trap <xsl:message terminate="yes">? I am able to trap error(), so the functionality is available in a different way, but I do not find any documentation at https://github.com/xspec/xspec/wiki/Writing-Scenarios#testing-dynamic-errors about how to trap an <xsl:message> that is supposed to terminate a transformation.


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AirQuick

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Jun 28, 2020, 3:34:48 PM6/28/20
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What is your Saxon version?

> Note that Saxon 9.9.1.5 or older has a bug where $x:result?err?value is always empty.
> Use 9.9.1.6 or later, if you need to test your error message body of <xsl:message terminate="yes">.

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David Birnbaum

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Jun 28, 2020, 3:43:57 PM6/28/20
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Running Tests...
Testing with SAXON EE 10.0

AirQuick

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Jun 28, 2020, 4:35:22 PM6/28/20
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Not reproduced on my end using XSpec v1.6.0 and Saxon-EE 10.0. It would be appreciated if you could provide a set of small files to reproduce the same result.

It is likely that Saxon actually ends up returning an empty value in your case.
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David Birnbaum

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Jun 28, 2020, 5:00:08 PM6/28/20
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(base) koala-4:lib djb$ cat message-test.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:djb="http://www.obdurodon.org"
    xmlns:f="http://www.obdurodon.org/function-variables"
    xmlns:math="http://www.w3.org/2005/xpath-functions/math" exclude-result-prefixes="xs math"
    version="3.0">
    <xsl:function name="djb:get-weights-scale" as="xs:double+">
        <xsl:param name="f:window-size" as="xs:integer"/>

        <xsl:if test="$f:window-size mod 2 eq 0 or $f:window-size lt 3">
            <xsl:message terminate="yes"
                select=
"
                    normalize-space(concat('Invalid window size: ',

                    $f:window-size, '; window size must be odd integer greater than
                3'))"
            />
        </xsl:if>
        <xsl:sequence>1</xsl:sequence>
    </xsl:function>
</xsl:stylesheet>
(base) koala-4:lib djb$ cat message-test.xspec
<?xml version="1.0" encoding="UTF-8"?>
<x:description xmlns:x="http://www.jenitennison.com/xslt/xspec" xmlns:djb="http://www.obdurodon.org"
    xmlns:f="http://www.obdurodon.org/function-variables" stylesheet="message-test.xsl">
    <x:scenario label="Scenario for testing function get-weights-scale" catch="yes">
        <x:call function="djb:get-weights-scale">
            <x:param name="f:window-size" select="4"/>
        </x:call>
        <x:expect label="err:value"
            test="$x:result?err?value/text()">Invalid window size: 4; window size must be odd integer greater than 3</x:expect>
    </x:scenario>
</x:description>
(base) koala-4:lib djb$ xspec message-test.xspec
Transformation failed: Unknown configuration feature help
Saxon script not found, invoking JVM directly instead.


Creating Test Stylesheet...





Running Tests...
Testing with SAXON EE 10.0
Scenario for testing function get-weights-scale
Invalid window size: 4; window size must be odd integer greater than 3
err:value
      FAILED


Formatting Report...
passed: 0 / pending: 0 / failed: 1 / total: 1
Report available at ./xspec/message-test-result.html
Done.
(base) koala-4:lib djb$ cat xspec/message-test-result.xml
<?xml version="1.0" encoding="UTF-8"?>
<x:report xmlns:djb="http://www.obdurodon.org"
          xmlns:f="http://www.obdurodon.org/function-variables"
          xmlns:x="http://www.jenitennison.com/xslt/xspec"
          stylesheet="file:/Users/djb/repos/plot/lib/message-test.xsl"
          date="2020-06-28T16:58:12.293-04:00"
          xspec="file:/Users/djb/repos/plot/lib/message-test.xspec">
   <x:scenario id="scenario1"
               xspec="file:/Users/djb/repos/plot/lib/message-test.xspec">
      <x:label>Scenario for testing function get-weights-scale</x:label>
      <x:call function="djb:get-weights-scale">
         <x:param name="f:window-size" select="4"/>
      </x:call>
      <x:result select="/*">
         <pseudo-map xmlns="http://www.jenitennison.com/xslt/xspec">map{"err":map{"column-number":15,"line-number":15,"module":"file:/Users/djb/repos/plot/lib/message-test.xsl","code":Q{http://www.w3.org/2005/xqt-errors}XTMM9000,"value":(),"description":"Processing terminated by xsl:message at line 15 in message-test.xsl. Found while atomizing the result of a call to djb:get-weights-scale#1"}}</pseudo-map>
      </x:result>
      <x:test id="scenario1-expect1" successful="false">
         <x:label>err:value</x:label>
         <x:result select="()"/>
         <x:expect test="$x:result?err?value/text()" select="/text()">Invalid window size: 4; window size must be odd integer greater than 3</x:expect>
      </x:test>
   </x:scenario>
</x:report>
(base) koala-4:lib djb$

AirQuick

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Jun 29, 2020, 3:03:26 AM6/29/20
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Thanks for the complete set for reproduction.

Looks like xsl:try on the current versions of Saxon fails to transfer the message body from xsl:message[@terminate="yes"] in xsl:function[@as].

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David Birnbaum

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Jun 29, 2020, 1:00:07 PM6/29/20
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Thank you for passing this along to Saxonica, where I see that Michael Kay has now opened a bug issue for it. I'll watch for a fix in Saxon, and continue to use error() until that happens.

AirQuick

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Jun 29, 2020, 1:46:28 PM6/29/20
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In https://github.com/xspec/xspec/pull/1030 , I'm adding an internal test to XSpec. That will ensure that your case will work on XSpec with the next maintenance release of Saxon (presumably 10.2) and onward. Just FYI.
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David Birnbaum

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Jul 1, 2020, 7:39:05 PM7/1/20
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