On 06.10.2020 22:57, Christophe Marchand cmarchand(_at_)oxiane(_dot_)com wrote:
Hello !
I have another question with accumulators. I use accumulators to
calculate block height, and then to calculate block locations (y).
I have this XSL for a repro...
<?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:private="top:marchand"
exclude-result-prefixes="#all"
version="3.0">
<xsl:output method="xml" indent="true"/>
<xsl:mode on-no-match="shallow-copy" use-accumulators="#all"/>
<xsl:accumulator name="blockHeight" as="xs:double" initial-value="0.0">
<xsl:accumulator-rule match="page">
<xsl:message>Reset block height to 3.2</xsl:message>
<xsl:sequence select="3.2"/>
</xsl:accumulator-rule>
<xsl:accumulator-rule match="private:block">
<xsl:message>Adding block height {@id} : {@height}</xsl:message>
<xsl:sequence select="$value + xs:double(@height)"/>
</xsl:accumulator-rule>
</xsl:accumulator>
<xsl:template match="block">
<xsl:variable name="height" as="xs:double" select="3.5"/>
<!-- produce some output -->
<xsl:variable name="TempTree" as="element(private:block)">
<private:block height="{$height}"/>
</xsl:variable>
<xsl:apply-templates select="$TempTree"/>
<xsl:copy>
<xsl:attribute name="y" select="accumulator-after('blockHeight')"/>
<xsl:apply-templates select="node() | @*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="private:block">
<xsl:message>private:block matched</xsl:message>
</xsl:template>
<xsl:template name="xsl:initial-template">
<xsl:variable name="content" as="document-node()">
<xsl:document>
<doc>
<page id="p1">
<block id="b1">
<!-- arbitrary content -->
</block>
<block id="b2">
<!-- another arbitrary content -->
</block>
</page>
<page id="p2">
<block id="b3">
<!-- arbitrary content -->
</block>
<block id="b4">
<!-- another arbitrary content -->
</block>
</page>
</doc>
</xsl:document>
</xsl:variable>
<xsl:apply-templates select="$content"/>
</xsl:template>
</xsl:stylesheet>
When I run this XSL on the sample XML, I have messages displayed :
"Reset block height to 3.2", "private:block matched", but never the
"Adding block height..."
According to specification [1], I expect private:block matches
accumulator rule, and accumulator value being augmented by block/@height.
What am I doing wrong ?
I wonder whether you have a node in a "tree" to which accumulators
apply. With the "as" attribute on
<xsl:variable name="TempTree" as="element(private:block)">
I am not sure the element is part of a tree.
Let's hear what others think.
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