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Re: `unreadablep'
From: |
Po Lu |
Subject: |
Re: `unreadablep' |
Date: |
Wed, 15 Dec 2021 20:42:03 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux) |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> Right...
>
> Skimming print_object and friends, it seems like the vast majority of
> the unprintable objects are in print_vectorlike, so I guess such a
> change could be made (pretty much?) locally to that function...
Don't we also have Lisp_Misc and friends? (But I'm not sure Lisp_Misc
is ever supposed to be printed at all, and I don't see Lisp_Misc
anywhere, so perhaps my recollection is faulty.)
> So I think doing it that way should be pretty easy to implement, and
> it's certainly general enough to be used in both of the cases I
> sketched. But the logic would have to be such that if
> `print-unreadable-function' returns some special value, then printing
> continues as normally (to implement the "just tell me if what was
> printed is readable" case).
We could have it return nil in that case.
> And calling out to Lisp in this case may be slower than the other
> solution sketched.
Unreadable objects are in general rare in printed objects, and a funcall
followed by a test against nil will not add any significant overhead to
prin1 either, so I wouldn't be worried about that.
Let's not optimize prematurely, especially with something like prin1 :)
- Re: `unreadablep', (continued)
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Lars Ingebrigtsen, 2021/12/15
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Lars Ingebrigtsen, 2021/12/15
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Lars Ingebrigtsen, 2021/12/15
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Ihor Radchenko, 2021/12/15
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Lars Ingebrigtsen, 2021/12/15
- Re: `unreadablep',
Po Lu <=
- Re: `unreadablep', Lars Ingebrigtsen, 2021/12/15
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Po Lu, 2021/12/15
- Re: `unreadablep', Lars Ingebrigtsen, 2021/12/15
- RE: [External] : Re: `unreadablep', Drew Adams, 2021/12/15
Re: `unreadablep', Ihor Radchenko, 2021/12/15