CODEWITHSUNDEEP
xslt
zerzer
zerzer

Reputation: 602

calculate a String as an equation in xsl

I have this simple string stored in a variable : 

<xsl:variable name="equation">
    15+10+32+98 
</xsl:variable>

and i want for xsl to take the string stored in this variable and deal with as a math equation to get the result, is there any suggestions ?

Upvotes: 0

Views: 714

Answers (1)

Thomas W
Thomas W

Reputation: 15361

If you only have to sum up numbers, the following XSLT 1.0 template add takes a "plus separated string" as argument and returns the sum.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0">

  <xsl:output method="text"/>

  <xsl:template name="add">
    <xsl:param name="plusSeparatedString"/>
    <xsl:param name="sumValue" select="0"/>

    <xsl:choose>
      <xsl:when test="contains($plusSeparatedString,'+')">
        <xsl:call-template name="add">
          <xsl:with-param name="plusSeparatedString" select="substring-after($plusSeparatedString,'+')"/>
          <xsl:with-param name="sumValue" select="$sumValue + substring-before($plusSeparatedString,'+')"/>
        </xsl:call-template>
      </xsl:when>
      <xsl:otherwise>
        <xsl:copy-of select="$sumValue + $plusSeparatedString"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <xsl:template match="/">
    <xsl:call-template name="add">
      <xsl:with-param name="plusSeparatedString" select="'4 + 6+ 8'"/>
    </xsl:call-template>
  </xsl:template>
</xsl:stylesheet>

Apply this test stylesheet to any document (e.g. itself) to see it works.

Upvotes: 1

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