[ http://issues.apache.org/jira/browse/XALANC-540?page=all ]
David Bertoni resolved XALANC-540:
----------------------------------
Fix Version: CurrentCVS
Resolution: Fixed
Patch committed.
> XPath absolute location path does not work when the context node was obtained
> from a result tree fragment through exsl:node-set()
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: XALANC-540
> URL: http://issues.apache.org/jira/browse/XALANC-540
> Project: XalanC
> Type: Bug
> Components: XPathC
> Versions: CurrentCVS, 1.8, 1.9
> Environment: Win2k on ix86.
> Reporter: Alain Le Guennec
> Assignee: David Bertoni
> Fix For: CurrentCVS
> Attachments: patch.txt
>
> XPath absolute location path does not work when the context node was obtained
> from a result tree fragment through exsl:node-set().
> Consider the following stylesheet (applied to any input document, the actual
> input does not matter):
> <?xml version="1.0" encoding = "ISO-8859-1"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> xmlns:exsl="http://exslt.org/common";>
> <xsl:template match="/">
> <xsl:variable name="var-rtf">
> <foo>
> <bar/>
> </foo>
> </xsl:variable>
> <xsl:variable name="var" select="exsl:node-set($var-rtf)/*"/>
> <xsl:apply-templates select="$var">
> <xsl:with-param name="root" select="$var"/>
> </xsl:apply-templates>
> </xsl:template>
> <xsl:template match="foo">
> <xsl:param name="root"/>
> <!-- Here the context node belongs to the tree fragment -->
> <xsl:variable name="count-from-implicit-root"
> select="count(//*)"/><!-- Does not work! -->
> <xsl:variable name="count-from-explicit-root"
> select="count($root/descendant-or-self::node())"/><!-- OK -->
> <xsl:choose>
> <xsl:when test="$count-from-implicit-root =
> $count-from-explicit-root">
> <xsl:message>No bug: There are <xsl:value-of
> select="$count-from-implicit-root"/> elements in the tree
> fragment.</xsl:message>
> </xsl:when>
> <xsl:otherwise>
> <!-- Navigation from the root of the tree
> fragment does not work. -->
> <xsl:message>Bug: There should be <xsl:value-of
> select="$count-from-explicit-root"/> elements in the tree fragment, not
> <xsl:value-of select="$count-from-implicit-root"/>.</xsl:message>
> </xsl:otherwise>
> </xsl:choose>
> </xsl:template>
> </xsl:stylesheet>
> Executing this stylesheet prints
> "Bug: There should be 2 elements in the tree fragment, not 0."
> where as it should print
> "No bug: There are 2 elements in the tree fragment."
> Apparently, the error lies in XPath.cpp, in function XPath::findRoot().
> I think it's because the XalanNodes representing the elements are connected
> to the XalanSourceTreeDocumentFragment, not to its owning
> XalanSourceTreeDocument.
> In this particular case, the actual root is not a DOCUMENT_NODE, but a
> DOCUMENT_FRAGMENT_NODE.
> Here is modified version of findRoot() that apparently fixes the problem (old
> code kept as comment):
> XPath::OpCodeMapPositionType
> XPath::findRoot(
> XPathExecutionContext& /* executionContext */,
> XalanNode* context,
> OpCodeMapPositionType opPos,
> OpCodeMapValueType /* stepType */,
> MutableNodeRefList& subQueryResults) const
> {
> assert(subQueryResults.empty() == true);
> const XPathExpression& currentExpression = getExpression();
> const OpCodeMapValueType argLen =
> currentExpression.getOpCodeArgumentLength(opPos);
> // XalanNode* const docContext = XalanNode::DOCUMENT_NODE ==
> context->getNodeType() ?
> // context
> :
> //
> context->getOwnerDocument();
> XalanNode* docContext = context;
> while (docContext->getNodeType() != XalanNode::DOCUMENT_NODE &&
> docContext->getNodeType() != XalanNode::DOCUMENT_FRAGMENT_NODE) {
> docContext = DOMServices::getParentOfNode(*docContext);
> }
> assert(docContext != 0);
> subQueryResults.addNode(docContext);
> subQueryResults.setDocumentOrder();
> return opPos + argLen + 3;
> }
> Hope this helps.
> Regards,
> Alain Le Guennec.
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