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Re: [xsl] Recursion not recursing, or not passing parameter. Multiple search/ replace.


Subject: Re: [xsl] Recursion not recursing, or not passing parameter. Multiple search/ replace.
From: "Kerry, Richard richard.kerry@xxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 17 Dec 2015 12:31:11 -0000

-----Original Message-----
From: Martin Honnen martin.honnen@xxxxxx
[mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, December 17, 2015 12:15 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [xsl] Recursion not recursing, or not passing parameter. Multiple
search/ replace.

Kerry, Richard richard.kerry@xxxxxxxx wrote:
> I am trying to write an XSLT stylesheet that does a multiple search
> and replace.  In order to make it work with multiple search/replace
> string pairs I think I need to use recursion, calling the built-in
> replace function for each pair.  However I don't seem to be getting
> the parameter set, or used, properly when I try to do the recursive
> call to do the next pair.
>
> I set up the pairs in a sequence of elements as follows:
>
>   <xsl:variable name="replace-spec" >
>     <replace source="smith_component" replacement="{$new-name}" />
>
>     <replace source="$ref-uuid-1" replacement="{$new-uuid-1}" />
>     <replace source="$ref-uuid-2" replacement="{$new-uuid-2}" />
>
>   </xsl:variable>

Here your variable is a tree fragment with three `replace` child elements.


>     <xsl:variable name="replace-1" select="$replace-spec/replace[1]"
> />

Here you select the first child element.

>     <xsl:variable name="source-text" as="xs:string"
> select="$replace-1/@source <mailto:$replace-1/@source>" />
>     <xsl:variable name="replacement-text" as="xs:string"
> select="$replace-1/@replacement <mailto:$replace-1/@replacement>" />
>
>     <xsl:variable name="template-text-2" as="xs:string"
> select="replace( $source-string, $source-text, $replacement-text )" />
>
>     <xsl:variable name="replace-remainder"
> select="$replace-1/following-sibling::*" />

Here you select the two following sibling elements

>     <xsl:choose>
>       <xsl:when test="$replace-remainder" >
>          <xsl:variable name="template-text-3"
> as="xs:string" select="my:replace-sequence( $template-text-2,
> $replace-remainder )" />

and pass them on, which means in the recursive call you are trying to select
the replace[1] child of those siblings, and they don't have children.

So you rather want to set up the variable as

   <xsl:variable name="replace-spec"
as="element(replace)*">...</xsl:variable>

then in the function select

   <xsl:variable name="replace-1" select="$replace-spec[1]" />

and further on

  <xsl:variable name="replace-remainder"
select="$replace-spec[position() gt 1]" />


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