Re: [xsl] Translating roman numerals into integers with XSLT 2.0

[David Carlisle <davidc@xxxxxxxxx>]

> Following is an improved algorithm.. It will work for
> any large number..

I think it was safer with the upper limit. If you put in a string that
is not a valid roman numeral, or not of the form generated by xsl:number
you go into an infinte loop. So if you want numbers in "Clock" style so
give "IIII" rather than "IV" you die.

The following just interprets the string directly (from the end)
not sure I have all (or enough) rules but it does the cases that it
does...

David


<?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";           
xmlns:num="http://whatever"; version="2.0" >
    
<xsl:output method="text"/>
    
<xsl:template match="/">
 
[<xsl:value-of select="num:RomanToInteger('I')"/>]
[<xsl:value-of select="num:RomanToInteger('II')"/>]
[<xsl:value-of select="num:RomanToInteger('IIII')"/>]
[<xsl:value-of select="num:RomanToInteger('IV')"/>]
[<xsl:value-of select="num:RomanToInteger('MMCCX')"/>]


</xsl:template>
    
    

  
<xsl:function name="num:RomanToInteger" as="xs:integer">
  <xsl:param name="r" as="xs:string"/>
  <xsl:choose>
   <xsl:when test="ends-with($r,'XC')">
      <xsl:sequence select="90+ num:RomanToInteger(substring($r,1,string-length($r)-2))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'L')">
      <xsl:sequence select="50+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'C')">
      <xsl:sequence select="100+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'D')">
      <xsl:sequence select="500+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'M')">
      <xsl:sequence select="1000+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'IV')">
      <xsl:sequence select="4+ num:RomanToInteger(substring($r,1,string-length($r)-2))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'IX')">
      <xsl:sequence select="9+ num:RomanToInteger(substring($r,1,string-length($r)-2))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'IIX')">
      <xsl:sequence select="8+ num:RomanToInteger(substring($r,1,string-length($r)-2))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'I')">
      <xsl:sequence select="1+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'V')">
      <xsl:sequence select="5+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:when test="ends-with($r,'X')">
      <xsl:sequence select="10+ num:RomanToInteger(substring($r,1,string-length($r)-1))"/>
   </xsl:when>
   <xsl:otherwise>
       <xsl:sequence select="0"/>
   </xsl:otherwise>
  </xsl:choose>
</xsl:function>



</xsl:stylesheet>


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