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.
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@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.
parenscript-devel mailing list parenscript-devel@common-lisp.net http://lists.common-lisp.net/cgi-bin/mailman/listinfo/parenscript-devel
great explanation! thank you so much!
On Sat, Jan 21, 2012 at 6:03 AM, Vladimir Sedach vsedach@gmail.com wrote:
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@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.
parenscript-devel mailing list parenscript-devel@common-lisp.net http://lists.common-lisp.net/cgi-bin/mailman/listinfo/parenscript-devel
parenscript-devel mailing list parenscript-devel@common-lisp.net http://lists.common-lisp.net/cgi-bin/mailman/listinfo/parenscript-devel
parenscript-devel@common-lisp.net
-
Canhua -
Vladimir Sedach