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noor Subject: How to add a string with math operators ?
Author: noor
Date: 10 Apr 2009 03:52 AM
Hi all,

May i know how to add a string with math operators ?

For example,

a variable has "30 + 40 + 10"
and i get the result as "80"

Please help me to get this...
Postnext
Tony LavinioSubject: How to add a string with math operators ?
Author: Tony Lavinio
Date: 10 Apr 2009 06:34 AM
There is no standard way in XSLT to evaluate the contents of a
variable as code.

You might want to look into the saxon:evaluate() extension function.
See http://www.saxonica.com/documentation/extensions/functions/evaluate.html

Postnext
John BamptonSubject: How to add a string with math operators ?
Author: John Bampton
Date: 10 Apr 2009 06:49 AM
If you have a variable with a value of something like '30 + 40 + 10' then you could use the following XSL to output the value

<?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:template match="/">
<xsl:variable name="string" select=" '30 + 40 + 10' "></xsl:variable>
<xsl:call-template name="sumstring">
<xsl:with-param name="string" select="$string"></xsl:with-param>
<xsl:with-param name="sum" select="0"></xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="sumstring">
<xsl:param name="string"></xsl:param>
<xsl:param name="sum"></xsl:param>
<xsl:choose>
<xsl:when test="string-length($string)">
<xsl:variable name="firstnumber" select="
if ( contains($string,'+') )
then number(substring-before($string,'+'))
else number($string) "></xsl:variable>

<xsl:variable name="currentsum" select="$sum + $firstnumber"></xsl:variable>

<xsl:variable name="newstring" select="if ( contains($string,'+') )
then substring-after($string,'+')
else '' "></xsl:variable>

<xsl:call-template name="sumstring">
<xsl:with-param name="string" select="$newstring"></xsl:with-param>
<xsl:with-param name="sum" select="$currentsum"></xsl:with-param>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$sum"></xsl:value-of>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>

Cheers, John Bampton.

Postnext
noor Subject: How to add a string with math operators ?
Author: noor
Date: 10 Apr 2009 09:03 AM
Very thanks to John and Tony.

I has another question,

Can we achieve this (john's) approach in xsl version 1.0, rather than using 2.0

So, i need to run it in xsl version 1.0 ?
please give me the solution ...
Postnext
John BamptonSubject: How to add a string with math operators ?
Author: John Bampton
Date: 10 Apr 2009 12:37 PM
It was a simple modification to the 2.0 code, you really should be doing some tutorials before you ask such basic questions

<?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="1.0">
<xsl:template match="/">
<xsl:variable name="string" select=" '30 + 40 + 10' "></xsl:variable>
<xsl:call-template name="sumstring">
<xsl:with-param name="string" select="$string"></xsl:with-param>
<xsl:with-param name="sum" select="0"></xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="sumstring">
<xsl:param name="string"></xsl:param>
<xsl:param name="sum"></xsl:param>
<xsl:choose>
<xsl:when test="string-length($string)">
<xsl:variable name="firstnumber">
<xsl:choose>
<xsl:when test="contains($string,'+')">
<xsl:value-of select="number(substring-before($string,'+')) "></xsl:value-of>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="number($string)"></xsl:value-of>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="currentsum" select="$sum + $firstnumber"></xsl:variable>
<xsl:variable name="newstring">
<xsl:choose>
<xsl:when test="contains($string,'+')">
<xsl:value-of select="substring-after($string,'+')"></xsl:value-of>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="''"></xsl:value-of>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:call-template name="sumstring">
<xsl:with-param name="string" select="$newstring"></xsl:with-param>
<xsl:with-param name="sum" select="$currentsum"></xsl:with-param>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$sum"></xsl:value-of>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>


Cheers, John Bampton.

Posttop
noor Subject: How to add a string with math operators ?
Author: noor
Date: 21 Apr 2009 07:14 AM
Thank you very much.
   
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