On Mon, Oct 20, 2008 at 04:21:31PM +0100, Tomas Hlavaty wrote:
 That's nice.  It could even be:

 (de <xml> Prg
    (prin "<" (pop 'Prg))
    (while (atom (car Prg))
       (prin " " (pop 'Prg) "=\"" (eval (pop 'Prg) 1) "\"") )
    (prin ">")
    (run Prg)       # the text, or other elements
    (prinl "</text>") )

 (<xml> text id 123  dx (+ 3 4)  dy (* 3 4)
(prin "No font and color arguments yet") )

Yes, that's even better.


In addition, to make it more robust, we should

1. Check for an empty body (avoid an infinite loop):

      (while (and Prg (atom (car Prg)))

2. Run the body in the binding environment of the caller:

      (run Prg 1)


Cheers,
- Alex

Thanks Alex and Tomas! I really liked your ideas. Here's my current version:

(de <xml> Lst
        (let Tag (pop 'Lst)
                (prin "<" Tag)
                (while (and Lst (atom (car Lst)))
                        (prin " " (pop 'Lst) "=\"" (eval (pop 'Lst) 1) "\"") )
                (if (car Lst)
                        (prog
                                (prin ">")
                                (run Lst 1)
                                (prinl "</" Tag ">") )
                        (prinl " />") ) ) )

And it works like this:

: (<xml> hoy id 123 (<xml> inner fun "abc"))
<hoy id="123"><inner fun="abc" />
</hoy>
-> ">"

The test "(if (car Lst) ..." determines whether the current element is a container ("hoy") or not ("inner").

Since this is "pure" XML, it would seem natural to find a function like this <xml> in lib/xml.l. I haven't studied the functions in that file yet, but there's one called "xml" that is said to "Generate/Parse XML data". It could be interesting to know what that one does that's different from the new <xml>.

/Jon
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