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Re: [xsl] Calculate mantissa and exponent?
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Subject: Re: [xsl] Calculate mantissa and exponent? From: Michael Case <mecase@xxxxxxxxxxx> Date: Fri, 10 Aug 2001 10:46:58 -0700 |
Hi,
Here goes. I hope this is message is not too long.
Any help/advice to shorten the ConvertSciToNumString.xsl, or make it in
anyway "better" would be appreciated. I am not yet very good at xsl.
Mike Case
xml test suite:
<main>
<mynum num="1"/>
<mynum num="-2"/>
<mynum num="3E-3"/>
<mynum num="-2E-4"/>
<mynum num=".5E-3"/>
<mynum num=".3E4"/>
<mynum num=".2E-4"/>
<mynum num="-.6E3"/>
<mynum num="-.6E-4"/>
<mynum num="6.022E23"/>
<mynum num=".312E1"/>
<mynum num="312E-2"/>
<mynum num="-0.312E1"/>
<mynum num="-312E-2"/>
<mynum num="923.9E-1"/>
<mynum num="1.625E-12"/>
<mynum num="1.E-5"/>
<mynum num="2.14160E-3"/>
<mynum num="2.14160e-3"/>
</main>
---------------------------------
use of template:
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"
>
<!--
Example usage of ConvertSciToNumString.xsl
-->
<xsl:template match="/">
<html>
<head>
<title>Output for web page</title>
</head>
<body>
<xsl:apply-templates/>
</body>
</html>
</xsl:template>
<xsl:template match="main">
<table border="1" align="center">
<th>num</th>
<th>converted</th>
<th>number()</th>
<xsl:apply-templates/>
</table>
</xsl:template>
<xsl:template match="mynum">
<tr>
<td><xsl:value-of select="@num"/></td>
<td>
<xsl:call-template name="convertSciToNumString">
<xsl:with-param name="myval" select="@num"/>
</xsl:call-template>
</td>
<td><xsl:value-of select="number(@num)"/></td>
</tr>
</xsl:template>
<xsl:include href="ConvertSciToNumString.xsl"/>
</xsl:stylesheet>
---------------------------------
ConvertSciToNumString.xsl
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"
>
<xsl:output method="xml"/>
<!--
ConvertSciToNumString
By: Michael Case
University of California, Davis
case@xxxxxxxxxxxxxxxxxx
Converts a string from Scientific notation to an XML acceptable number
(as a string).
e.g. convert from 1E-10 to 0.0000000001
Include this template in your XSL file using: <xsl:include
href="ConvertSciToNumString.xsl">
Input parameters to ConvertSciToNumString
myval the number to be checked.
Input parameters to realConvertSciToNumString (base 10 assumed):
vnum the un-signed mantissa
sgn the sign, an empty string or '-'
This puts out a text result which can be enclosed in the calling XSL
with <xsl:element>,
<xsl:attribute> or nothing (leave as text).
-->
<!-- necessary global maximum/minimum of exponent 'stuffer', set to 100
-->
<xsl:variable name="max-exp">
<xsl:value-of
select="'0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'"/>
</xsl:variable>
<xsl:template name="convertSciToNumString">
<xsl:param name="myval" select="''"/>
<xsl:variable name="useval">
<xsl:value-of select="translate(string($myval),'e','E')"/>
</xsl:variable>
<xsl:choose>
<xsl:when test="not(number($useval))">
<xsl:choose>
<xsl:when test="number(substring-before($useval, 'E'))">
<xsl:choose>
<xsl:when test="number(substring-after($useval, 'E'))">
<xsl:if test="number(substring-before($useval, 'E')) <
0">
<xsl:call-template name="realConvertSciToNumString">
<xsl:with-param name="vnum"
select="substring-after($useval, '-')"/>
<xsl:with-param name="vsgn" select="'-'"/>
</xsl:call-template>
</xsl:if>
<xsl:if test="number(substring-before($useval, 'E')) >
0">
<xsl:call-template name="realConvertSciToNumString">
<xsl:with-param name="vnum" select="$useval"/>
</xsl:call-template>
</xsl:if>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$useval"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$useval"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="number($useval)"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="realConvertSciToNumString" >
<xsl:param name="vnum" select="0"/>
<xsl:param name="vsgn" select="''"/>
<xsl:choose>
<xsl:when test="number(vnum)">
<xsl:value-of select="$vnum"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="vmantisa">
<xsl:value-of select="number(substring-before($vnum,
'E'))"/>
</xsl:variable>
<xsl:variable name="vexponent">
<xsl:value-of select="number(substring-after($vnum,
'E'))"/>
</xsl:variable>
<!-- handle 0.9.... -->
<xsl:if test="$vmantisa < 1">
<!-- handle 0.9E-9 -->
<xsl:if test="$vexponent < 0">
<xsl:variable name="voffset">
<xsl:value-of
select="string-length(substring-before($vmantisa, '.'))"/>
</xsl:variable>
<xsl:value-of select="concat($vsgn, '0', '.',
substring($max-exp, 1, ($vexponent * -1) -
$voffset),substring-before($vmantisa,'.'), substring-after($vmantisa,
'.'))"/>
</xsl:if>
<!-- handle 0.9E9 -->
<xsl:if test="$vexponent > 0">
<xsl:variable name="voffset">
<xsl:value-of
select="string-length(substring-after($vmantisa, '.'))"/>
</xsl:variable>
<xsl:choose>
<!-- handle .932E1 -->
<xsl:when test="$voffset > $vexponent">
<xsl:value-of select="concat($vsgn,
substring(substring-after($vmantisa, '.'), 1, $vexponent), '.',
substring(substring-after($vmantisa, '.'), $vexponent + 1,
string-length($vmantisa) - $vexponent))"/>
</xsl:when>
<!-- handle .9E3 -->
<xsl:when test="$voffset < $vexponent">
<xsl:value-of select="concat($vsgn,
substring-after($vmantisa, '.'), substring($max-exp, 1, ($vexponent -
$voffset)))"/>
</xsl:when>
<!-- handle .9E1 -->
<xsl:when test="$voffset = $vexponent">
<xsl:value-of select="concat($vsgn,
substring-before($vmantisa, '.'), substring-after($vmantisa, '.'))"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="NaN"/>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:if>
<!-- handle 9.9.... -->
<xsl:if test="$vmantisa >= 1">
<!-- handle 9.9E-9 -->
<xsl:if test="$vexponent < 0">
<xsl:variable name="voffset">
<xsl:value-of
select="string-length(substring-before($vmantisa, '.'))"/>
</xsl:variable>
<xsl:choose>
<!-- really handle 923.9E-1 -->
<xsl:when test="$voffset > $vexponent * -1">
<xsl:value-of select="concat($vsgn,
substring(substring-before($vmantisa, '.'), 1,
string-length(substring-before($vmantisa, '.')) + $vexponent), '.',
substring(substring-before($vmantisa, '.'),
string-length(substring-before($vmantisa, '.')) + $vexponent + 1,
$vexponent * -1), substring-after($vmantisa, '.'))"/>
</xsl:when>
<!-- really handle 9.9E-9 -->
<xsl:when test="$voffset < $vexponent * -1 and
$voffset > 0">
<xsl:value-of select="concat($vsgn, '0', '.',
substring($max-exp, 1, ($vexponent * -1) - $voffset),
substring-before($vmantisa, '.'), substring-after($vmantisa, '.'))"/>
</xsl:when>
<!-- handle 9.9E-1 -->
<xsl:when test="$voffset = $vexponent * -1 and
$voffset > 0">
<xsl:value-of select="concat($vsgn, '0', '.',
substring-before($vmantisa, '.'), substring-after($vmantisa, '.'))"/>
</xsl:when>
<!-- handle 9E-9 -->
<xsl:when test="$voffset = 0 and
string-length($vmantisa) < $vexponent * -1">
<xsl:value-of select="concat($vsgn, '0', '.',
substring($max-exp, 1, ($vexponent * -1) - string-length($vmantisa)),
$vmantisa)"/>
</xsl:when>
<!-- handle 999E-1-->
<xsl:when test="$voffset = 0 and
string-length($vmantisa) > $vexponent * -1">
<xsl:value-of select="concat($vsgn,
substring($vmantisa, 1, string-length($vmantisa) + $vexponent), '.',
substring($vmantisa, string-length($vmantisa) + $vexponent + 1,
$vexponent * -1))"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="'NaN'"/>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
<!-- handle 9.9E9 -->
<xsl:if test="$vexponent > 0">
<xsl:variable name="voffset">
<xsl:value-of
select="string-length(substring-after($vmantisa, '.'))"/>
</xsl:variable>
<xsl:value-of select="concat($vsgn,
substring-before($vmantisa, '.'), substring-after($vmantisa, '.'),
substring($max-exp, 1, ($vexponent - 1 - $voffset)))"/>
</xsl:if>
</xsl:if>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet
Bruce Kyle wrote:
>
> Absolutely interested. Would you mind posting it?
>
> bruce
>
> -----Original Message-----
> From: Michael Case [SMTP:mecase@xxxxxxxxxxx]
> Sent: Friday, August 10, 2001 9:36 AM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [xsl] Calculate mantissa and exponent?
>
> Hi,
>
> Thanks for this. I wrote something going the opposite way and wonder if
> there is any interest for that? I can send it to the list or to an
> someone else if they are interested.
>
> Sincerely,
>
> Michael Case
>
> "Mitchell, Edmund" wrote:
> >
> > Thanks, Tim. I did, and it was a small part of what I needed. If anyone
> > else needs it, here it is, courtesy of sdussinger:
> >
> > sample.xml:
> >
> > <a>
> > <num>0.00000004</num>
> > <num>123456</num>
> > <num>-756444</num>
> > </a>
> >
> ... stuff deleted
> --
> Michael E. Case
> UC Davis
> case@xxxxxxxxxxxxxxxxxx
> (530) 754-7226
>
> XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
--
Michael E. Case
UC Davis
case@xxxxxxxxxxxxxxxxxx
(530) 754-7226
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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