Re: [xsl] [Accumulators] Another stupid question

["Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

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