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Re: [xsl] How can one get the name of a template or function?


Subject: Re: [xsl] How can one get the name of a template or function?
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxx>
Date: Wed, 13 Mar 2013 10:06:45 -0400

Hi,

This approach is also explored (independently) in these two articles:

http://balisage.net/Proceedings/vol8/html/Clark01/BalisageVol8-Clark01.html
http://jtei.revues.org/722

Cheers, Wendell


On Tue, Mar 12, 2013 at 5:27 PM, Philip Fearon <pgfearo@xxxxxxxxxxxxxx> wrote:
> A crude approach for collecting data on invoked templates, is to use a
> 'meta' XSLT stylesheet that modifies the XSLT you're interested in
> collecting data on. This could insert xsl:message instructions in each
> target template. You then just need to use this modified stylesheet on
> sample data.
>
> The XSLT might look something like this (this version not tested):
>
> <?xml version="1.0" encoding="utf-8"?>
> <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xmlns:pxsl="http://qutoric.com/proxy-for-xsl">
>
> <xsl:namespace-alias stylesheet-prefix="pxsl" result-prefix="xsl"/>
>
> <xsl:output method="xml" indent="no"/>
>
> <xsl:template match="@* | node()">
> <xsl:copy>
> <xsl:apply-templates select="@* | node()"/>
> </xsl:copy>
> </xsl:template>
>
> <xsl:template
>
> match="xsl:template">
> <xsl:choose>
> <xsl:when test="empty(*)">
> <xsl:copy-of select="."/>
> </xsl:when>
> <xsl:otherwise>
>
> <xsl:copy>
> <xsl:apply-templates select="@*| xsl:param"/>
>
> <xsl:apply-templates select="node() except xsl:param"/>
> <xsl:variable name="msg" as="xs:string*">
> <xsl:for-each select="@*">
> <xsl:if test="name(.) = ('match','mode','name')">
> <xsl:value-of select="concat(' ', name(.),': ',.)"/>
> </xsl:if>
> </xsl:for-each>
> </xsl:variable>
> <xsl:text>&#10;</xsl:text>
> <pxsl:message>Template-Signature: <xsl:value-of select="msg"/></pxsl:message>
> <xsl:text>&#10;</xsl:text>
>
> </xsl:copy>
> </xsl:otherwise>
> </xsl:choose>
>
> </xsl:template>
>
> </xsl:stylesheet>
>
> -------------
>
> Phil Fearon
>
> On Fri, Mar 1, 2013 at 3:50 AM, John Laurence Poole <jlpoole56@xxxxxxxxx> wrote:
>> I'm resurrecting an old 2009 topic regarding
>> getting the name of a template.
>>
>> I followed Michael's suggestion below and have
>> successfully written an extension function that
>> produces the names of the template in instances
>> where the template is invoke through the
>> xsl:call-template mechanism.
>>
>> I'd be happy to provide a how-to on how I accomplished this along with
>> demonstration files if someone would like them; I suspect this is a
>> very esoteric area and there would not be any takers on my offer.
>>
>> What I would like to have is the ability to get
>> the name of a template in instances where the
>> template is invoked via the match mechanism:
>> xsl:apply-templates.  This would be for instances where
>> the template has a name attribute, e.g. name="template_ABC".  I tried
>> invoking my function similar to that below in a match situation and
>> null was returned despite the fact that the template that matched had
>> a name attribute.
>>
>> Any suggestions on how to approach this?  I'm new to studying the
>> internals of Saxon, but believe there must be some place where
>> information about the templates is stored to be accessed by the parser
>> for the match facility and that extending the properties of the
>> storage model to include a name attribute in instances where a
>> template does have a name attribute would be the way toapproach this.
>> Maybe I'm barking up the wrong tree and the matching mechanism is not
>> what I'm imagining?
>>
>> Thanks,
>>
>> John Poole
>>
>>
>> here's the message I'm following up on:
>>
>> On 2009-02-11 11:57:49  Michael Kay posted to this list:
>>
>> If you're prepared to grovel around the depths of Saxon internals, you can
>> write an extension function
>>
>>
>> public static String getTemplateName(net.sf.saxon.expr XPathContext context)
>> {
>>      try {
>>         return context.getOrigin().getObjectName().getDisplayName();
>>      } catch (Exception err) {
>>         return null;
>>      }
>> }
>>
>> and call it without any arguments as xx:getTemplateName(). Not tested. It
>> will only give the template name if it was invoked using call-template.
>> Should probably work for function calls as well.
>>
>> Michael Kay
>> http://www.saxonica.com/
>



--
Wendell Piez | http://www.wendellpiez.com
XML | XSLT | electronic publishing
Eat Your Vegetables
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