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RE: [xsl] binary-or

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Hey Ruben!

How's this for a much shorter version... haven't had a chance to test it exhaustively, but it appears to work:

<xslt:template name="BinaryOr">
	<xslt:param name="op1" select="'0'"/>
	<xslt:param name="op2" select="'0'"/>
		
	<xslt:if test="$op1 != '' or $op2 != ''">
		<xslt:call-template name="BinaryOr">
			<xslt:with-param name="op1" select="substring($op1, 1, string-length($op1)-1)"/>
			<xslt:with-param name="op2" select="substring($op2, 1, string-length($op2)-1)"/>
		</xslt:call-template>
		<xslt:choose>
			<xslt:when test="$op2 mod 2">1</xslt:when>
			<xslt:otherwise><xslt:value-of select="$op1 mod 2"/></xslt:otherwise>
		</xslt:choose>
	</xslt:if>
</xslt:template>


This is a recursive template that starts from the left most character, iterating successively.  At each position it'll take a modulus by 2 on the second param.  If it is 1, then it displays one, otherwise it returns the modulus of the first param.

HTH!

Dion

-----Original Message-----
From: Rubén [mailto:rubenm@xxxxxxxxxxxxx] 
Sent: Wednesday, September 25, 2002 1:35 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: [xsl] binary-or


Hello list! I couldn't find a "binary-or" (or "mask-or") operation in XPath 1.1 so I tried to
emulate it with a template. I wrote a recursive implementation but I'm not very
happy with the result. I wonder if there is a simpler (and maybe more efficient)
solution. Any suggestions?

This is the template:

<!--
This template accepts two parameters of type string and performs a "binary-or" operation assuming that parameters represent binary numbers.
Examples:
  <xsl:call-template name="or"><xsl:with-param name="operand1" select="'0011'"/><xsl:with-param name="operand2" select="'1010'"/></xsl:call-template>
  -> '1011'

  <xsl:call-template name="or"><xsl:with-param name="operand1" select="'000011'"/><xsl:with-param name="operand2" select="'1010'"/></xsl:call-template>
  -> '001011'

  <xsl:call-template name="or"><xsl:with-param name="operand1" select="'110011'"/><xsl:with-param name="operand2" select="'1010'"/></xsl:call-template>
  -> '111011'
-->
<xsl:template name="or">
<xsl:param name="operand1" select="''"/>
<xsl:param name="operand2" select="''"/>
<xsl:choose>
   <xsl:when test="string-length($operand1)=0"><xsl:value-of select="$operand2"/></xsl:when>
   <xsl:when test="string-length($operand2)=0"><xsl:value-of select="$operand1"/></xsl:when>
   <xsl:otherwise>
   <xsl:variable name="first" select="number(number(substring($operand1, string-length($operand1))) or number(substring($operand2, string-length($operand2))))"/>
   <xsl:variable name="rest">
      <xsl:call-template name="or">
         <xsl:with-param name="operand1" select="substring($operand1, 1, string-length($operand1)-1)"/>
         <xsl:with-param name="operand2" select="substring($operand2, 1, string-length($operand2)-1)"/>
      </xsl:call-template>
   </xsl:variable>
   <xsl:value-of select="concat($rest, $first)"/>
   </xsl:otherwise>
</xsl:choose>
</xsl:template>

Thanks a lot in advance.








                       * * * TEST FILES (Not really needed I think) * * *
===============================================================================================================
test-or.xml
===============================================================================================================
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="test-or.xsl"?>
<test-or>
<test>
   <op1>0000</op1>
   <op2></op2>
</test>
<test>
   <op1>1111</op1>
   <op2></op2>
</test>
<test>
   <op1>1010</op1>
   <op2></op2>
</test>
<test>
   <op1>0101</op1>
   <op2></op2>
</test>
<test>
   <op1></op1>
   <op2>0000</op2>
</test>
<test>
   <op1></op1>
   <op2>1111</op2>
</test>
<test>
   <op1></op1>
   <op2>1010</op2>
</test>
<test>
   <op1></op1>
   <op2>0101</op2>
</test>
<test>
   <op1>0000</op1>
   <op2>0000</op2>
</test>
<test>
   <op1>1111</op1>
   <op2>1111</op2>
</test>
<test>
   <op1>1010</op1>
   <op2>1010</op2>
</test>
<test>
   <op1>0101</op1>
   <op2>0101</op2>
</test>
<test>
   <op1>1010</op1>
   <op2>0101</op2>
</test>
<test>
   <op1>0101</op1>
   <op2>1010</op2>
</test>
<test>
   <op1>11110101</op1>
   <op2>0101</op2>
</test>
<test>
   <op1>00000101</op1>
   <op2>0101</op2>
</test>
<test>
   <op1>11110101</op1>
   <op2>1010</op2>
</test>
<test>
   <op1>00000101</op1>
   <op2>1010</op2>
</test>
<test>
   <op1>10100101</op1>
   <op2>1010</op2>
</test>
<test>
   <op1>01010101</op1>
   <op2>1010</op2>
</test>
<test>
   <op1>0101</op1>
   <op2>11111010</op2>
</test>
<test>
   <op1>0101</op1>
   <op2>00001010</op2>
</test>
<test>
   <op1>0101</op1>
   <op2>10101010</op2>
</test>
<test>
   <op1>0101</op1>
   <op2>01011010</op2>
</test>
</test-or>

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

<xsl:template match="/test-or">
<results>
   <xsl:apply-templates select="test"/>
</results>
</xsl:template>

<xsl:template match="test">
<result>
<xsl:value-of select="op1"/> or <xsl:value-of select="op2"/> = <xsl:call-template name="or"><xsl:with-param name="operand1" select="op1"/><xsl:with-param name="operand2" select="op2"/></xsl:call-template>
</result>
</xsl:template>

<!--
This template accepts two parameters of type string and performs a "binary-or" operation assuming that parameters represent binary numbers.
Examples:
  <xsl:call-template name="or"><xsl:with-param name="operand1" select="'0011'"/><xsl:with-param name="operand2" select="'1010'"/></xsl:call-template>
  -> '1011'

  <xsl:call-template name="or"><xsl:with-param name="operand1" select="'000011'"/><xsl:with-param name="operand2" select="'1010'"/></xsl:call-template>
  -> '001011'

  <xsl:call-template name="or"><xsl:with-param name="operand1" select="'110011'"/><xsl:with-param name="operand2" select="'1010'"/></xsl:call-template>
  -> '111011'
-->
<xsl:template name="or">
<xsl:param name="operand1" select="''"/>
<xsl:param name="operand2" select="''"/>
<xsl:choose>
   <xsl:when test="string-length($operand1)=0"><xsl:value-of select="$operand2"/></xsl:when>
   <xsl:when test="string-length($operand2)=0"><xsl:value-of select="$operand1"/></xsl:when>
   <xsl:otherwise>
   <xsl:variable name="first" select="number(number(substring($operand1, string-length($operand1))) or number(substring($operand2, string-length($operand2))))"/>
   <xsl:variable name="rest">
      <xsl:call-template name="or">
         <xsl:with-param name="operand1" select="substring($operand1, 1, string-length($operand1)-1)"/>
         <xsl:with-param name="operand2" select="substring($operand2, 1, string-length($operand2)-1)"/>
      </xsl:call-template>
   </xsl:variable>
   <xsl:value-of select="concat($rest, $first)"/>
   </xsl:otherwise>
</xsl:choose>
</xsl:template>

</xsl:stylesheet>


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