Re: Running a lisp script

Re: Running a lisp script

[David Combs]

In article <8762dxw4l6.fsf@kuiper.lan.informatimago.com>,
Pascal J. Bourguignon <pjb@informatimago.com> wrote:
>
>That said, emacs lisp is close enough to Common Lisp.  Learning Common
>Lisp, you'll know enough to write emacs lisp code.  (Mostly, emacs lisp
>is a subset of Common Lisp; there's also (require 'cl) to provide more
>CL-like operators).  ...
>
>
>
>-- 
>__Pascal Bourguignon__                     http://www.informatimago.com/
>A bad day in () is better than a good day in {}.


Outta say something about those new scoping rules that Sussman and IforgetWho
invented 30 or more years ago and created Scheme to use it with, and that
later, when Common Lisp was being decided etc, put it there too.

Too late at night for me to remember the name of the "scheme", but
Perl added it via its (sic) "local" variables.   AH -- dynamic binding,
that's what it's called.  Which Elisp doesn't have, being derived from
MacLisp thinking.

That was a long time ago.  Is what I remember actually a correct memory?

Thanks,

David

Re: Running a lisp script

[Juanma Barranquero]

On Sun, Apr 22, 2012 at 08:06, David Combs <dkcombs@panix.com> wrote:

> Too late at night for me to remember the name of the "scheme", but
> Perl added it via its (sic) "local" variables.   AH -- dynamic binding,
> that's what it's called.  Which Elisp doesn't have, being derived from
> MacLisp thinking.
>
> That was a long time ago.  Is what I remember actually a correct memory?

I think you've mixed a bit lexical and dynamic scoping (Perl "local"
is indeed dynamic scoping, but Scheme's novelty was lexical scoping,
which Common Lisp copied).

http://en.wikipedia.org/wiki/Lexical_scope#Lexical_scoping_and_dynamic_scoping

    Juanma

Re: Running a lisp script

[PJ Weisberg]

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On Sunday, April 22, 2012, Juanma Barranquero <lekktu@gmail.com> wrote:
> On Sun, Apr 22, 2012 at 08:06, David Combs <dkcombs@panix.com> wrote:
>
>> Too late at night for me to remember the name of the "scheme", but
>> Perl added it via its (sic) "local" variables.   AH -- dynamic binding,
>> that's what it's called.  Which Elisp doesn't have, being derived from
>> MacLisp thinking.
>>
>> That was a long time ago.  Is what I remember actually a correct memory?
>
> I think you've mixed a bit lexical and dynamic scoping (Perl "local"
> is indeed dynamic scoping, but Scheme's novelty was lexical scoping,
> which Common Lisp copied).

And to answer the question, elisp supports dynamic scoping, and support for
lexical scoping will be added in Emacs 24.1.

-- 
-PJ

Gehm's Corollary to Clark's Law: Any technology distinguishable from
magic is insufficiently advanced.

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Re: Running a lisp script

[David Combs]

In article <mailman.444.1335122807.751.help-gnu-emacs@gnu.org>,
PJ Weisberg  <pjweisberg@gmail.com> wrote:
>-=-=-=-=-=-
>
>On Sunday, April 22, 2012, Juanma Barranquero <lekktu@gmail.com> wrote:
>> On Sun, Apr 22, 2012 at 08:06, David Combs <dkcombs@panix.com> wrote:
>>
>>> Too late at night for me to remember the name of the "scheme", but
>>> Perl added it via its (sic) "local" variables.   AH -- dynamic binding,
>>> that's what it's called.  Which Elisp doesn't have, being derived from
>>> MacLisp thinking.
>>>
>>> That was a long time ago.  Is what I remember actually a correct memory?
>>
>> I think you've mixed a bit lexical and dynamic scoping (Perl "local"
>> is indeed dynamic scoping, but Scheme's novelty was lexical scoping,
>> which Common Lisp copied).
>
>And to answer the question, elisp supports dynamic scoping, and support for
>lexical scoping will be added in Emacs 24.1.
>
>-- 
>-PJ
>
>Gehm's Corollary to Clark's Law: Any technology distinguishable from
>magic is insufficiently advanced.
>
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WOW!

David