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Re: Anything better for delayed lexical evaluation than (lambda () ...)?

From: Andy Wingo
Subject: Re: Anything better for delayed lexical evaluation than (lambda () ...)?
Date: Tue, 13 Dec 2011 14:05:19 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)

On Tue 13 Dec 2011 10:02, David Kastrup <address@hidden> writes:

> Lilypond's input language is not "David's current strategy".

I was referring to your implementation strategy.  Mark describes
another implementation strategy.

> It does not help because it requires _advance_ knowledge of when you are
> going to want to fish for environments.  You can call Lilypond's
> #{ ... #} construct in the normal REPL.  You can call it in any function
> definition.  It is pervasive.

I was suggesting to evaluate all lilypond "scheme" code with the lilypond
"scheme" interpreter.  That would make `the-environment' available

I still think making your #{}# parser expand to lexically-scoped Scheme
is the best option.

Another option is to use the reflective facilities to implement a form
of procedure-environment.  If you compile your Scheme procedures, with
partial evaluation disabled, you should be able to use program-bindings
to get this information.

I wonder if we could provide some sort of current-bindings syntactic
form, also.  It would require psyntax hooks, but it could work.


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