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Thais FlorySubject: Numeric string not displaying decimal trailing zeros
Author: Thais Flory
Date: 02 Oct 2008 01:16 PM
I have created an XSLT 2 UDF to set the precision of prices and line costs. It either pads or rounds the decimal part, if necessary. The padding mechanism is the one occasionally failing, yet it is using XSLT's concat() to add the trailing zeros, which should be returning a string.

This doesn't fail in Stylus Studio, which is set to use the Saxon 9.0.0.2 processor. But it fails in random situations on the web server, which is using Saxon-B 9.1.0.1. I thought maybe something changed and I need to do some explicit type casting?

These are the UDFs I'm talking about:

<!-- precision -->
<xsl:function name="format:precision">
<xsl:param name="value"/>
<xsl:param name="decimalPrecision"/>

<xsl:variable name="decimalPart" select="substring-after(string($value), '.')"/>
<xsl:variable name="decimalPartLength" select="string-length($decimalPart)"/>

<xsl:choose>
<xsl:when test="$decimalPartLength = 0">
<xsl:value-of select="concat($value, '.', format:padding('0', $decimalPrecision))"/>
</xsl:when>
<xsl:when test="$decimalPartLength lt $decimalPrecision">
<xsl:value-of select="concat($value, format:padding('0', $decimalPrecision - $decimalPartLength))"/>
</xsl:when>
<xsl:when test="$decimalPartLength = $decimalPrecision">
<xsl:value-of select="$value"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="factor" select="math:naturalExponentiation(10, $decimalPrecision)"/>
<xsl:value-of select="round($value * $factor) div $factor"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>

<!-- padding -->
<xsl:function name="format:padding">
<xsl:param name="character"/>
<xsl:param name="times"/>

<xsl:choose>
<xsl:when test="$times lt 0"/>
<xsl:when test="$times = 0">
<xsl:value-of select="''"/>
</xsl:when>
<xsl:when test="$times = 1">
<xsl:value-of select="$character"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="concat($character, format:padding($character, $times - 1))"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>

Any help would be appreciated!
Thais

Postnext
Tony LavinioSubject: Numeric string not displaying decimal trailing zeros
Author: Tony Lavinio
Date: 05 Oct 2008 11:21 PM
You might want to ask Dr. Kay directly, on the saxon-help mailing list.
There were some changes recently in the numeric handling code, but as
to what could cause problems on your webserver deployment, it would be
hard to guess with what you've shown us, and is a little out of our
domain. He, however, might be able to provide some valuable insights.

Posttop
Thais FlorySubject: Numeric string not displaying decimal trailing zeros
Author: Thais Flory
Date: 07 Oct 2008 09:33 AM
Thank you. I did post a message on the saxon help forum. The problem is solved now.
Multiplying 30.159 by 210, for example, was not returning 6333.39 as expected, it was returning several decimal places, even after changing all of the involved numeric types to xs:decimal. So the padding part of my code was not getting executed at all, but the rounding part, which was then returning the appropriate value 6333.39, without the padding. So all I had to do was invoke my precision function again before returning from the rounding procedure.

 
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