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Re: [Accumulators] Another stupid question

Subject: Re: [Accumulators] Another stupid question
From: "Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 6 Oct 2020 21:34:35 -0000
Re:  [Accumulators] Another stupid question
Just another observation:

If the accumulator in the main document isn't referred to, the message "Reset block height to 3.2" won't be emitted, either. Therefore I assume an accumulator will be optimized away unless used.


On 06.10.2020 23:31, Christophe Marchand cmarchand@xxxxxxxxxx wrote:
Ok, thanks a lot, Martin and Gerrit. So I must use a two pass strategy if I'm not able to directly calculate widht on content.

Not a good news, but, thanks to you, I now know how to solve my problem !

Best regards,
Christophe

Le 06/10/2020 C 23:20, Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx a C)critB :
The private:block elements are trees of their own and they have their own accumulator values (that are available in the template that matches private:block). But they don't add to the 'blockHeight' accumulator of the main document.

On 06.10.2020 22:57, Christophe Marchand cmarchand@xxxxxxxxxx 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"
B B  xmlns:xs="http://www.w3.org/2001/XMLSchema"
B B  xmlns:private="top:marchand"
B B  exclude-result-prefixes="#all"
B B  version="3.0">

B B <xsl:output method="xml" indent="true"/>

B B <xsl:mode on-no-match="shallow-copy" use-accumulators="#all"/>

B B <xsl:accumulator name="blockHeight" as="xs:double" initial-value="0.0">
B B B B <xsl:accumulator-rule match="page">
B B B B B B <xsl:message>Reset block height to 3.2</xsl:message>
B B B B B B <xsl:sequence select="3.2"/>
B B B B </xsl:accumulator-rule>
B B B B <xsl:accumulator-rule match="private:block">
B B B B B B <xsl:message>Adding block height {@id} : {@height}</xsl:message>
B B B B B B <xsl:sequence select="$value + xs:double(@height)"/>
B B B B </xsl:accumulator-rule>
B B </xsl:accumulator>


B B <xsl:template match="block">
B B B B <xsl:variable name="height" as="xs:double" select="3.5"/>
B B B B <!-- produce some output -->
B B B B <xsl:variable name="TempTree" as="element(private:block)">
B B B B B B <private:block height="{$height}"/>
B B B B </xsl:variable>
B B B B <xsl:apply-templates select="$TempTree"/>
B B B B <xsl:copy>
B B B B B B <xsl:attribute name="y" select="accumulator-after('blockHeight')"/>
B B B B B B <xsl:apply-templates select="node() | @*"/>
B B B B </xsl:copy>
B B </xsl:template>


B B  <xsl:template match="private:block">
B B B B  <xsl:message>private:block matched</xsl:message>
B B  </xsl:template>

B B  <xsl:template name="xsl:initial-template">
B B B B  <xsl:variable name="content" as="document-node()">
B B B B B B  <xsl:document>
B B B B B B B B  <doc>
B B B B B B B B B B  <page id="p1">
B B B B B B B B B B B B  <block id="b1">
B B B B B B B B B B B B B B  <!-- arbitrary content -->
B B B B B B B B B B B B  </block>
B B B B B B B B B B B B  <block id="b2">
B B B B B B B B B B B B B B  <!-- another arbitrary content -->
B B B B B B B B B B B B  </block>
B B B B B B B B B B  </page>
B B B B B B B B B B  <page id="p2">
B B B B B B B B B B B B  <block id="b3">
B B B B B B B B B B B B B B  <!-- arbitrary content -->
B B B B B B B B B B B B  </block>
B B B B B B B B B B B B  <block id="b4">
B B B B B B B B B B B B B B  <!-- another arbitrary content -->
B B B B B B B B B B B B  </block>
B B B B B B B B B B  </page>
B B B B B B B B  </doc>
B B B B B B  </xsl:document>
B B B B  </xsl:variable>
B B B B  <xsl:apply-templates select="$content"/>
B B  </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 ?

Thanks in advance,
Christophe

[1] : 18.2.2 https://www.w3.org/TR/xslt-30/#applicability-of-accumulators list item 1

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