[parenscript-devel] help: question about eval-when usage

[Vladimir Sedach]

Hi,

It is indeed an omission in the reference manual - EVAL-WHEN is a
supported Parenscript form. I will add it to the manual soon.
EVAL-WHEN in Parenscript has the following meaning:

The code in BODY is assumed to be Common Lisp code
in :compile-toplevel and :load-toplevel sitations, and Parenscript
code in :execute

So for example, this is how the Parenscript macro IN-PACKAGE is defined:

(defpsmacro in-package (package-designator)
  `(eval-when (:compile-toplevel)
     (in-package ,package-designator)))

It just executes CL code - handy when you're writing .paren files that
only have Parenscript code.

Vladimir

On Thu, Jan 19, 2012 at 10:44 PM, Canhua <dreameration at gmail.com> wrote:
> I am reading codes of paren-util. I find that it use "eval-when"
> inside defpsmacro.
> But I don't find that parenscript reference says eva-when is supported.
> As I understand, defpsmacro should expand into a valid parenscript code. Does
> parenscript support eval-when that although doesn't appear in reference.
>
> Thanks.
>
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