Subject: Re: [xsl] [XSL 3.0] Function that check if a xs:string can be converted as a xs:double From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Wed, 31 May 2023 20:18:45 -0000 |
In XPath 4.0 this could be: fn:castable-as := function($in as xs:string, $typeName as xs:string) { fn:op("castable as") ($in, $typeName ) } or just: fn:castable-as := fn:op("castable as") and this function could be chained within a sequence of other functions. but I don't think we at present allow "castable as" as a possible argument value of fn:op What would also be more desirable is to have a type-object (not a type-name as xs:string) as the 2nd function parameter and in the language. A type object can have such useful associated functions as parse() and show() (print / serialize), that one wouldn't even need to have a special function checking if a value is parsable to a given type. Just parse it and act correspondingly to the result. Having a type object passed as parameter one could specify a series of generic operations on any value of that type. Thanks, Dimitre On Wed, May 31, 2023 at 4:57b/AM Christophe Marchand cmarchand@xxxxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello ! > > I have to write a function taht take a xs:string as parameter, returns a > xs:boolean, and says true() if string is a valid number, false() otherwise. > > Something like > > <xsl:function name="f:isNumber" as="xs:boolean"> > <xsl:param name="expression" as="xs:string"/> > <xsl:sequence select="....."/> > </xsl:function> > > '1' -> true() > '2' -> true() > 'foo' -> false() > 'bar' -> false() > > Rules to be a valid number are the same as those used in number() function. > > Any help wil be much appreciated ! > > Christophe > XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list> > EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/782854> (by > email <>)
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