[parenscript-devel] top-level LET and LET* will not create global variables
Is this expected? CL-USER> (ql:quickload "parenscript") ... CL-USER> (defpackage :ps-user (:use :cl :ps)) #<The PS-USER package, 0/16 internal, 0/16 external> CL-USER> (in-package "PS-USER") #<The PS-USER package, 0/16 internal, 0/16 external> PS-USER> (ps (let ((s-a)))) "(function () { var sA = null; return null; })();" Also, $ cat foo.lisp (let ((s-a)) (+ s-a 42) (chain s-a (append-child foo))) PS-USER> (ps-compile-file "foo.lisp") "(function () { var sA = null; sA + 42; return sA.appendChild(foo); })(); " PS-USER> Which is against documentation "Top-level LET and LET* forms will create new global variables, or overwrite the values of already existing global variables with the same name." Please comment
Hi Yakov, Yes, that does look inconsistent with the documentation. I use DEFPARAMETER if I need such a variable. Perhaps that line of documentation dates from before Vladimir implemented lexical scoping. By the way, Vladimir is traveling for a few months and most changes will probably have to wait until he is back. Daniel On Thu, May 17, 2012 at 5:48 PM, Yakov Zaytsev <yakov@clickgrab.net> wrote:
Is this expected?
CL-USER> (ql:quickload "parenscript") ... CL-USER> (defpackage :ps-user (:use :cl :ps)) #<The PS-USER package, 0/16 internal, 0/16 external>
CL-USER> (in-package "PS-USER") #<The PS-USER package, 0/16 internal, 0/16 external>
PS-USER> (ps (let ((s-a)))) "(function () {
var sA = null;
return null;
})();"
Also,
$ cat foo.lisp (let ((s-a)) (+ s-a 42) (chain s-a (append-child foo)))
PS-USER> (ps-compile-file "foo.lisp") "(function () {
var sA = null;
sA + 42;
return sA.appendChild(foo);
})();
"
PS-USER>
Which is against documentation "Top-level LET and LET* forms will create new global variables, or overwrite the values of already existing global variables with the same name."
Please comment
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Hi, That is indeed an reference in the manual to behavior that's been fixed. Top-level LETs now get wrapped in functions and do not introduce global variables. I've fixed the reference manual in the repository and on the Parenscript website. Thank you for the bug report. Vladimir On Fri, May 18, 2012 at 9:40 AM, Daniel Gackle <danielgackle@gmail.com> wrote:
Hi Yakov,
Yes, that does look inconsistent with the documentation. I use DEFPARAMETER if I need such a variable.
Perhaps that line of documentation dates from before Vladimir implemented lexical scoping.
By the way, Vladimir is traveling for a few months and most changes will probably have to wait until he is back.
Daniel
On Thu, May 17, 2012 at 5:48 PM, Yakov Zaytsev <yakov@clickgrab.net> wrote:
Is this expected?
CL-USER> (ql:quickload "parenscript") ... CL-USER> (defpackage :ps-user (:use :cl :ps)) #<The PS-USER package, 0/16 internal, 0/16 external>
CL-USER> (in-package "PS-USER") #<The PS-USER package, 0/16 internal, 0/16 external>
PS-USER> (ps (let ((s-a)))) "(function () {
var sA = null;
return null;
})();"
Also,
$ cat foo.lisp (let ((s-a)) (+ s-a 42) (chain s-a (append-child foo)))
PS-USER> (ps-compile-file "foo.lisp") "(function () {
var sA = null;
sA + 42;
return sA.appendChild(foo);
})();
"
PS-USER>
Which is against documentation "Top-level LET and LET* forms will create new global variables, or overwrite the values of already existing global variables with the same name."
Please comment
_______________________________________________ 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
participants (3)
-
Daniel Gackle -
Vladimir Sedach -
Yakov Zaytsev