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Value of variable is undefined
Added by Anonymous almost 19 years ago
Legacy ID: #3302322
Legacy Poster: Dominique Hazaël-Massieux (nimbustier)
When applying the style sheet below on itself with saxon 8.5, saxon exists with the
following Java exception: Exception in thread "main"
java.lang.AssertionError: Value of variable is undefined (null) at
net.sf.saxon.value.Value.getIterator(Value.java:227) at
net.sf.saxon.value.Value.asItem(Value.java:78) at
net.sf.saxon.expr.VariableReference.evaluateItem(VariableReference.java:224) [....] This
error disappears: * when commenting out both call-template calls inside compare-child *
and even more oddly when using the -T option in the command line I have tried with
several versions of java, so I'm fairly convinced it's indeed a bug in saxon. Thanks!
Dom <?xml-stylesheet
href="http://www.w3.org/StyleSheets/base.css"
type="text/css"?><?xml-stylesheet
href="http://www.w3.org/2002/02/style-xsl.css"
type="text/css"?> <xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:html="http://www.w3.org/1999/xhtml"
exclude-result-prefixes="html"> <!-- Output method XML
--> <xsl:output method="xml"
indent="yes" omit-xml-declaration="no"
encoding="utf-8"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN" /> <p
class="copyright"><a
href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a>
©2002-2005 <a href="http://www.w3.org/"><acronym
title="World Wide Web
Consortium">W3C</acronym></a><sup>®</sup>
(<a href="http://www.csail.mit.edu/"><acronym
title="Massachusetts Institute of
Technology">MIT</acronym></a>, <a
href="http://www.ercim.org/"><acronym
title="European Research Consortium for Informatics and
Mathematics">ERCIM</acronym></a>, <a
href="http://www.keio.ac.jp/">Keio</a>), All
Rights Reserved. W3C <a
href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
<a
href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a>
and <a
href="http://www.w3.org/Consortium/Legal/copyright-documents">document
use</a> rules apply.</p> <xsl:template
match="/"> <xsl:apply-templates
select="/xsl:stylesheet/html:p"/> </xsl:template>
<xsl:template match="/xsl:stylesheet/html:p">
<html> <xsl:call-template
name="compare-childs"> <xsl:with-param
name="element"
select="document('/home/dom/WWW/2001/07/pubrules-copyright.xml')/html:html/html:body/html:p[@class='copyright']"
/> </xsl:call-template> </html>
</xsl:template> <xsl:template
name="compare-childs"> <xsl:param
name="element" /> <xsl:for-each
select=""> <xsl:variable name="pos"
select="position()" />
<xsl:message><xsl:copy-of
select="$element/[position()=$pos]"/></xsl:message>
<xsl:call-template name="compare-attributes">
<xsl:with-param name="node"
select="$element/[position()=$pos]" />
</xsl:call-template> <xsl:if
test="not(normalize-space(.)=normalize-space($element/[position()=$pos])) or
not($element/[position()=$pos])"> <li> <span
class="no">Incorrect text</span>:
"<xsl:value-of select="normalize-space()"
/>" should be "<xsl:value-of
select="$element/[position()=$pos]" />"
.</li> </xsl:if> <xsl:call-template
name="compare-childs"> <xsl:with-param
name="element" select="$element/[position()=$pos]"
/> </xsl:call-template> </xsl:for-each>
</xsl:template> <xsl:template
name="compare-attributes"> <xsl:param
name="node" /> <xsl:variable
name="node2" select="." />
<xsl:for-each select="$node/@"> <xsl:variable
name="attribute-name" select="local-name()"
/> <xsl:choose> <xsl:when
test="not($node2/@[local-name()=$attribute-name])">
<li> <span class="no">Could not find
attribute <xsl:value-of select="$attribute-name" /> in
<xsl:copy-of select="$node2" /> </span>
</li> </xsl:when> <xsl:otherwise>
<xsl:if
test="not(normalize-space($node2/@[local-name()=$attribute-name])=normalize-space(.))">
<li>Attribute <xsl:value-of
select="$attribute-name" /> in <xsl:copy-of
select="$node2" /> has the <span
class="no">incorrect value</span>
<xsl:value-of select="$node2/@*[local-name()=$attribute-name]"
/> (should be <xsl:value-of select="." />
</li> </xsl:if> </xsl:otherwise>
</xsl:choose> </xsl:for-each> </xsl:template>
</xsl:stylesheet>
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Legacy ID: #3302328
Legacy Poster: Dominique Hazaël-Massieux (nimbustier)
Sorry, to be able to run it anywhere, replace the
document('/home/dom/WWW/2001/07/pubrules-copyright.xml') with
document('http://www.w3.org/2001/07/pubrules-copyright.xml')
Legacy ID: #3302352
Legacy Poster: Michael Kay (mhkay)
Thanks, Dominique - this is definitely a bug. I'll look into it - probably after the
weekend. It's not odd that such bugs go away when using -T, because compiling trace code
into the expression tree has the side effect of suppressing many tree-rewriting
optimizations. Michael Kay
Legacy ID: #3302396
Legacy Poster: Michael Kay (mhkay)
Sorry, but the stylesheet has been corrupted by the copy/paste operation. Could you
possibly put it as an attachment in hte "support requests" section of
the site, or just email it to me direct? Michael Kay
Legacy ID: #3305084
Legacy Poster: Michael Kay (mhkay)
Sorry, but there's no attachment. (This happens sometimes. You have to enter the
filename, tick the checkbox, and click "Submit changes".)
Legacy ID: #3305257
Legacy Poster: Dominique Hazaël-Massieux (nimbustier)
Oops! Should be there now... Sorry I'm making this so hard :)
Legacy ID: #3306343
Legacy Poster: Michael Kay (mhkay)
I've registered this bug and published a source fix at
https://sourceforge.net/tracker/index.php?func=detail&aid=1266525&group_id=29872&atid=397617
The construct that is causing the problem is the with-param select expression in
<xsl:call-template name="compare-childs">
<xsl:with-param name="element"
select="$element/*[position()=$pos]" />
</xsl:call-template> If you don't want to rebuild the Saxon code, you
could circumvent the problem by changing the predicate to [position() - $pos = 0] which
the optimizer isn't clever enough to meddle with. I'm hoping to get an 8.5.1 release out
in the next couple of weeks that will have this fixed. Michael Kay
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