How can I format a decimal in xquery? - xquery

Question

I'm trying to format decimals in XQuery. The decimals are currency, so the format should be ,###.##.
For example:
5573652.23 should be 5,573,652.23
and
352769 should be 352,769 (or 352,769.00 if it's easier/cleaner)
Right now I'm using this function from http://www.xqueryhacker.com/2009/09/format-number-in-xquery/, but I can't use decimals with it:
declare function local:format-int($i as xs:int) as xs:string
{
let $input :=
if ($i lt 0) then fn:substring(fn:string($i), 2)
else fn:string($i)
let $rev := fn:reverse(fn:string-to-codepoints(fn:string($input)))
let $comma := fn:string-to-codepoints(',')
let $chars :=
for $c at $i in $rev
return (
$c,
if ($i mod 3 eq 0 and fn:not($i eq count($rev)))
then $comma else ()
)
return fn:concat(
if ($i lt 0) then '-' else (),
fn:codepoints-to-string(fn:reverse($chars))
)
};
I'm using Saxon 9HE for my processor.
Any help would be greatly appreciated.
----- UPDATE -----
Based on Dimitre's answer, I modified the function to save the decimal portion and add it to the end of the return string.
New Function
declare function local:format-dec($i as xs:decimal) as xs:string
{
let $input := tokenize(string(abs($i)),'\.')[1]
let $dec := substring(tokenize(string($i),'\.')[2],1,2)
let $rev := reverse(string-to-codepoints(string($input)))
let $comma := string-to-codepoints(',')
let $chars :=
for $c at $i in $rev
return (
$c,
if ($i mod 3 eq 0 and not($i eq count($rev)))
then $comma else ()
)
return concat(if ($i lt 0) then '-' else (),
codepoints-to-string(reverse($chars)),
if ($dec != '') then concat('.',$dec) else ()
)
};

Answer 1

Use:
let $n := 5573652.23
return
concat(local:format-int(xs:int(floor($n))),
'.',
substring(string($n - floor($n)), 3)
)
This produces exactly the wanted, correct result:
5,573,652.23

Answer 2

This doesn't work for you?:
format-number(5573652.23,",###.##")
You can play with this here. I am pretty sure that saxon supports this function.
Edit: This function is not supported in saxon (see comments below).

Answer 3

With XQuery 3.0 and Saxon-HE 9.7 Parser you can do the following:
declare decimal-format local:de decimal-separator = "," grouping-separator = ".";
declare decimal-format local:en decimal-separator = "." grouping-separator = ",";
let $numbers := (1234.567, 789, 1234567.765)
for $i in $numbers
return (
format-number($i,"#.###,##","local:de"),
format-number($i,"#,###.##","local:en")
)
The output is:
<?xml version="1.0" encoding="UTF-8"?>1.234,57 1,234.57 789,0 789.0 1.234.567,76
1,234,567.76