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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: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 17 Dec 2015 12:14:02 -0000

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}" />


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: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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