[xquery-talk] XPath/XQuery equivalent of xsl:number?
G. Ken Holman
gkholman at CraneSoftwrights.com
Thu Nov 17 11:11:35 PST 2011
Below is what I use in the classroom for Roman numerals for a limited
set of numbers.
For your alpha numbers I would work with codepoints-to-string() ...
but it isn't something I've already done.
I hope this helps.
. . . . . . . . . . . Ken
xquery version "1.0";
(:
A library to transform a number less than 4000 to a sequence of
Roman digits.
Crane Softwrights Ltd. XQuery Training
:)
module namespace n2r = "urn:X-Crane:n2roman";
(:the basis of transformation is a series of strings for components:)
declare variable $n2r:values as element(value)+ :=
(
<value num="1" char="I" />,
<value num="4" char="IV"/>,
<value num="5" char="V" />,
<value num="9" char="IX"/>,
<value num="10" char="X" />,
<value num="40" char="XL"/>,
<value num="50" char="L" />,
<value num="90" char="XC"/>,
<value num="100" char="C" />,
<value num="400" char="CD"/>,
<value num="500" char="D" />,
<value num="900" char="CM"/>,
<value num="1000" char="M" />
);
(:return the concatenation of strings by continuous reduction:)
declare function n2r:n2roman ( $num as xs:integer ) as xs:string
{
(:as long as we have a number, keep going:)
if ( $num ) then
(:reduce by the largest number that has a string value:)
for $val in $n2r:values[@num <= $num][fn:last()] return
(:using the highest value:)
fn:concat( $val/@char,n2r:n2roman( $num - xs:integer( $val/@num ) ) )
(:nothing left:)
else ""
};
(:end of file:)
At 2011-11-17 14:04 -0500, Joe Wicentowski wrote:
>Hi all,
>
>I am constructing a table of contents based on a TEI document (whose
>structure consists primarily of nested divs), and would like to be
>able to generate appropriate heading levels for each the table of
>contents hierarchy. Specifically, I want to be able to generate the
>"I", "II", "A", "B", and "a" bits in:
>
>I. Chapter 1
>II. Chapter 2
> A. Section 1
> B. Section 2
> a) Subsection 1
>
>Put another way, borrowing from CSS terminology, I need to be able to
>format an integer as "upper-roman", "upper-alpha", and "lower-alpha."
>
>Borrowing from XSL terminology, I need to perform the equivalent
>function of <xsl:number>, as in:
>
> <xsl:number value="2" format="I'/> ==> returns "II"
> <xsl:number value="2" format="a'/> ==> returns "b"
> <xsl:number value="2" format="A'/> ==> returns "B"
>
>I think what I really need is XPath 3.0's fn:format-integer()
>function[1], but it appears that XPath 3.0 is still at the Working
>Draft stage.
>
>So my question: Of course I could hack my own format-integer()
>function together (indeed, my current kludge is to pipe out my
>integers to an XSL stylesheet), but is there an XPath or XQuery
>library that would let me do this?
>
>Thanks,
>Joe
>
>[1] http://www.w3.org/TR/xpath-functions-30/#func-format-integer
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