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SRFI 220: Line directives Arthur A. Gleckler (09 Feb 2021 23:01 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 06:49 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 07:20 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 08:46 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 10:14 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 10:37 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 10:19 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 10:24 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 10:30 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 10:54 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 11:13 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 12:31 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 12:41 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 12:49 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 13:12 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 13:21 UTC)
Re: SRFI 220: Line directives Vladimir Nikishkin (10 Feb 2021 12:47 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 12:53 UTC)
Re: SRFI 220: Line directives Vladimir Nikishkin (10 Feb 2021 12:56 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 12:57 UTC)
Re: SRFI 220: Line directives Vladimir Nikishkin (10 Feb 2021 13:05 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 13:13 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 13:26 UTC)
Re: SRFI 220: Line directives Vladimir Nikishkin (10 Feb 2021 13:36 UTC)
Re: SRFI 220: Line directives Lassi Kortela (10 Feb 2021 13:49 UTC)
Re: SRFI 220: Line directives Vladimir Nikishkin (10 Feb 2021 15:42 UTC)
Re: SRFI 220: Line directives Lassi Kortela (11 Feb 2021 10:06 UTC)
Declarations in general Lassi Kortela (11 Feb 2021 10:26 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (11 Feb 2021 12:18 UTC)
Re: SRFI 220: Line directives Lassi Kortela (11 Feb 2021 12:57 UTC)
Re: SRFI 220: Line directives Lassi Kortela (17 Feb 2021 08:23 UTC)
Re: SRFI 220: Line directives John Cowan (18 Feb 2021 03:07 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (18 Feb 2021 10:16 UTC)
Re: SRFI 220: Line directives John Cowan (18 Feb 2021 23:47 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (19 Feb 2021 07:08 UTC)
Re: SRFI 220: Line directives Lassi Kortela (19 Feb 2021 07:16 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (19 Feb 2021 07:18 UTC)
Re: SRFI 220: Line directives Lassi Kortela (19 Feb 2021 07:27 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (19 Feb 2021 07:32 UTC)
Re: SRFI 220: Line directives Lassi Kortela (19 Feb 2021 07:42 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (19 Feb 2021 08:35 UTC)
Re: SRFI 220: Line directives John Cowan (20 Feb 2021 01:11 UTC)
Re: SRFI 220: Line directives Marc Nieper-Wißkirchen (10 Feb 2021 12:25 UTC)

Re: SRFI 220: Line directives Lassi Kortela 19 Feb 2021 07:42 UTC

> While it is still unclear what you exactly mean by "#! directive",

It's not that important what we mean by the word because the concept
isn't that well developed. RnRS only has a small handful of directives.

I'm using it to mean something that doesn't cause a datum to come out of
`(read)`. But a lot of the existing #! does emit a datum, which shows
that "doesn't emit a datum" may not be a good principle for "#!" to have
in RnRS.

> taking the above list as examples, it is clear the shebang lines are no
> directives in this sense and can and should be left out of the discussion.

A shebang line shouldn't emit a datum out of `(read)`, but can benefit
from other processing, so I think it fits fine with directives.

You could say a directive has to affect reader state. A shebang line can
affect reader state (e.g. "#! /usr/bin/env r7rs-script" could switch to
R7RS read syntax) but does not have to. #!nocache already exists and
doesn't affect reader state either.

>     #!key
>     #!optional
>     #!rest
>
> What do you mean by "only valid inside a lambda list"? The reader
> doesn't know the concept of a lambda list.

You're right. In Gambit and Kawa you can type stuff like (eq? #!optional
#!optional) and it works. So these are implemented as self-evaluating
objects.

In Kawa #:foo needs to be quoted explicitly, similar to vector literals
in R6RS. Similarly one could require '#!optional and such. But this is
not reader-level stuff either.