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[j-devel] Re: find-symbol on keywords package

From: Adam Warner <lists@co...> - 2004-11-13 04:22

Hi Randolph and Peter,

> On Fri, 12 Nov 2004 at 04:19:47 +0200, Randolph Udodenko wrote:
>> (find-symbol "A" "") fails because it cannot find package named "".
>> however, in clisp and ACL it works..
> 
> This behavior does not appear to be required by the standard

Correct. "" is the package designator for the package with the name "".
This package is probably not currently defined.

One could define the package first:
(unless (find-package "") (make-package "" :use '()))

And then (find-symbol "A" "") will return {nil, nil}.

The CLHS even contains an examples of creating the package first using
make-package:

 (find-symbol "NIL" (prog1 (make-package "JUST-TESTING" :use '())
                           (intern "NIL" "JUST-TESTING")))

Regards,
Adam

[j-devel] Re: find-symbol on keywords package

From: Alex Mizrahi <udodenko@us...> - 2004-11-13 12:05

(message (Hello 'Adam)
(you :wrote  :on '(Sat, 13 Nov 2004 17:22:35 +1300))
(

 >> This behavior does not appear to be required by the standard

 AW> Correct. "" is the package designator for the package with the name
 AW> "".
 AW> This package is probably not currently defined.

 AW> One could define the package first:
 AW> (unless (find-package "") (make-package "" :use '()))

really question is if (find-package "") should return #<PACKAGE KEYWORD>

)
(With-best-regards '(Alex Mizrahi) :aka 'killer_storm)
(prin1 "Jane dates only Lisp programmers"))

[j-devel] Re: find-symbol on keywords package

From: Alex Mizrahi <udodenko@us...> - 2004-11-13 12:19

(message (Hello 'Peter)
(you :wrote  :on '(Fri, 12 Nov 2004 04:49:35 -0800))
(

 PG> On Fri, 12 Nov 2004 at 04:19:47 +0200, Randolph Udodenko wrote:
 >> (find-symbol "A" "") fails because it cannot find package named "".
 >> however, in clisp and ACL it works..

 PG> This behavior does not appear to be required by the standard, and it
 PG> doesn't work in the CLISP I have here

strange, in version 2.33.1 (find-package "") returned KEYWORD package..

 PG> slime does find the arglist correctly when I type "(:foo ".

it appears to be working with newer slime.

)
(With-best-regards '(Alex Mizrahi) :aka 'killer_storm)
(prin1 "Jane dates only Lisp programmers"))

Re: [j-devel] Re: find-symbol on keywords package

From: Peter Graves <peter@ar...> - 2004-11-13 13:59

On Sat, 13 Nov 2004 at 14:05:26 +0200, Alex Mizrahi wrote:
> really question is if (find-package "") should return #<PACKAGE KEYWORD>

Right. And I think the answer is that it should not.

-Peter

[j-devel] Re: find-symbol on keywords package

From: Adam Warner <lists@co...> - 2004-11-13 23:56

Hi Alex Mizrahi,

>  AW> One could define the package first:
>  AW> (unless (find-package "") (make-package "" :use '()))
> 
> really question is if (find-package "") should return #<PACKAGE KEYWORD>

We know (find-package "KEYWORD") will return the keyword package. So
the only way (find-package "") could also return the keyword package is if
"" denotes a nickname for the keyword package.

ANSI Common Lisp defines no nickname for the keyword package. Therefore
you cannot use (find-package "") to return the keyword package in portable
code.

   11.1.2 Standardized Packages

   This section describes the packages that are available in every
   conforming implementation. A summary of the names and nicknames of
   those standardized packages is given in the next figure.

   Name              Nicknames  
   COMMON-LISP       CL         
   COMMON-LISP-USER  CL-USER    
   KEYWORD           none       

   Figure 11-2. Standardized Package Names

Regards,
Adam