after a little bit of thinking, decided regexps might be a better way to
go to match a number and/or string when one cannot resort to anything
schema based.....
the following example xml/xslt has a few limitations ( like data has to
be in discrete tokens..) have created a few functions with xsl:function
which does a loose type checking for string or numbers.
example xml
<?xml version="1.0" encoding="UTF-8"?>
<example>
<test>123123</test>
<test>lkhjklhj</test>
</example>
example xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:type="http://www.ruminate.co.uk/type">
<xsl:output method="xml" indent="yes"/>
<xsl:variable name="x" select="example/test[1]" as="xs:integer"/>
<xsl:template match="example">
Test matching number
using istype:<xsl:value-of select="type:istype(test[1],'number')"/>
using isnumber:<xsl:value-of select="type:isnumber(test[1])"/>
using isstring:<xsl:value-of select="type:isstring(test[1])"/>
Test matching string
using istype:<xsl:value-of select="type:istype(test[2],'string')"/>
using isnumber:<xsl:value-of select="type:isnumber(test[2])"/>
using isstring:<xsl:value-of select="type:isstring(test[2])"/>
</xsl:template>
<xsl:function name="type:isnumber">
<xsl:param name="select"/>
<xsl:choose>
<xsl:when test="$select">
<xsl:analyze-string select="$select" regex="[\d]+"
flags="m">
<xsl:matching-substring>
<xsl:value-of select="true()"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="false()"/>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:when>
<xsl:otherwise>
NaN
</xsl:otherwise>
</xsl:choose>
</xsl:function>
<xsl:function name="type:isstring">
<xsl:param name="select"/>
<xsl:choose>
<xsl:when test="$select">
<xsl:analyze-string select="$select"
regex="[A-Z,a-z,\s]+" flags="m">
<xsl:matching-substring>
<xsl:value-of select="true()"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="false()"/>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:when>
<xsl:otherwise>
NaN
</xsl:otherwise>
</xsl:choose>
</xsl:function>
<xsl:function name="type:istype">
<xsl:param name="select"/>
<xsl:param name="type"/>
<xsl:choose>
<xsl:when test="$type='string' or $type='s'">
<xsl:analyze-string select="$select"
regex="[A-Z,a-z,\s]+" flags="m">
<xsl:matching-substring>
<xsl:value-of select="true()"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="false()"/>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:when>
<xsl:when test="$type='number' or $type='n'">
<xsl:analyze-string select="$select" regex="[\d]+"
flags="m">
<xsl:matching-substring>
<xsl:value-of select="true()"/>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="false()"/>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:when>
<xsl:otherwise>
NaN
</xsl:otherwise>
</xsl:choose>
</xsl:function>
</xsl:stylesheet>
this is fine and dandy in a basic XSLT 2.0 processor, and potentiall
could be extended, though I find it uncomfortable that xsl:function
automatically casts my params as xs:string when there is no declaration,
so doing something like the following (in an XSLT 2.0 processor that is
schema aware).
Test X (xs:integer) matching string
using istype:<xsl:value-of select="type:istype($x,'number')"/>
using isnumber:<xsl:value-of select="type:isnumber($x)"/>
using isstring:<xsl:value-of select="type:isstring($x)"/>
will through out an error, I guess I could employ the use-when attribute
to check for schema conformance (does this exist as a system property?).
btw, does anyone else find it weird that xsl:function doesnt have the
ability to prescribe a return type ?...I wanted to return a boolean
type...but found doing something like <xsl:value-of select="true()"/> to
be awkward.
cheers, Jim Fuller
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