Hi Bruno,
> I'm going through the picolisp application development tutorial (
> http://software-lab.de/doc/app.html#tags) and I'm trying this piece of code
> at the tags section:
>
> : (<div> 'main
> (<h1> NIL "Head")
> (<p> NIL
> (<br> "Line 1")
> "Line"
> (<nbsp>)
> (+ 1 1) ) )
> <div class="main"><h1>Head</h1>
> <p>Line 1<br/>
> Line </p>
> </div>
>
> That is, the (+ 1 1) part is not evaluated.
In fact it *is* evaluated, but it does not print anything.
All those HTML functions are *print* front-ends, which send text to the current
output channel.
: (<h1> NIL "Head")
<h1>Head</h1>
is nothing more than
: (prinl "<h1>Head</h1>")
<h1>Head</h1>
just in a more convenient form.
The nice thing is that these functions may be nested, as can be seen in your
example (<div> 'main (<h1> NIL "Head") ..). Still they must print somewhere at
the bottom.
So the answer to your question is to write
(ht:Prin (+ 1 1))
or just
(prin (+ 1 1))
('ht:Prin' is recommended for textual data which may contain HTML meta
characters
to properly escape them)
Note that - for convenience - *atomic* expressions (like "Head" or "Line" in
your example) are printed directly, so that it is not necessary to write
(<h1> NIL (prin "Head")) # Not needed
This is also mentioned in doc/app.html as
• If an argument is an atom (a number or a symbol (string)), its value is
printed immediately.
• Otherwise (a list), it is evaluated as a Lisp function (typically some form
of print statement).
♪♫ Alex
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