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Re: [xsl] Recursive string replace in XSLT 2.0

2017-01-06 14:43:29

On 6 Jan 2017, at 19:41, David Carlisle 
d(_dot_)p(_dot_)carlisle(_at_)gmail(_dot_)com 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

I'd have written it as a function rather than template, but the main
issue is you want your parameter to be (always) a sequence of elements
not sometimes a sequence of elements and sometimes a document node
with a sequence of child elements.

And the best way of ensuring that is to declare the types e.g.

<xsl:param name="regex" as="element(regex)*/>

which (a) documents what you are expecting for the benefit of the human reader, 
(b) gives you a type error if the caller supplies the wrong type of value, and 
(c) gives the optimizer more information to work with.

Michael Kay
Saxonica



<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
   xmlns:xs="http://www.w3.org/2001/XMLSchema";
   exclude-result-prefixes="xs"
   version="2.0">

   <xsl:output indent="yes"/>

   <xsl:param name="regexes">
       <regex><find>a</find><change>x</change></regex>
       <regex><find>b</find><change>y</change></regex>
       <regex><find>c</find><change>z</change></regex>
   </xsl:param>

   <xsl:template match="/">
       <xsl:apply-templates/>
   </xsl:template>

   <xsl:template match="p">
       <p><xsl:apply-templates/></p>
   </xsl:template>

   <xsl:template match="text()"><!--[string-length(.)>0]-->
       <xsl:message select="."></xsl:message>
       <xsl:call-template name="applyRegexes">
           <xsl:with-param name="nodeText" select="."/>
           <xsl:with-param name="regex" select="$regexes/regex"/>
        </xsl:call-template>
   </xsl:template>

   <xsl:template name="applyRegexes">
       <xsl:param name="nodeText"/>
       <xsl:param name="regex"/>
       <xsl:message select="$regex"></xsl:message>
       <xsl:message select="$regex[1]"/>
       <xsl:message select="$regex[position()>1]"/>
       <xsl:choose>
           <xsl:when test="$regex">
               <xsl:call-template name="applyRegexes">
                   <xsl:with-param name="nodeText"
select="replace($nodeText,$regex[1]/find,$regex[1]/change)"/>
                   <xsl:with-param name="regex"
select="$regex[position()>1]"/>
               </xsl:call-template>
           </xsl:when>
           <xsl:otherwise>
               <xsl:value-of select="$nodeText"/>
           </xsl:otherwise>
       </xsl:choose>
    </xsl:template>

</xsl:stylesheet>

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