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bug#37036: [PATCH] Inconsistent ASCII and Latin char categories
From: |
Mattias Engdegård |
Subject: |
bug#37036: [PATCH] Inconsistent ASCII and Latin char categories |
Date: |
Thu, 15 Aug 2019 19:37:49 +0200 |
15 aug. 2019 kl. 18.59 skrev Eli Zaretskii <eliz@gnu.org>:
>
> What about "abcdef^A^B"? Does M-f stop before the control characters?
Yes. Does forward-word use categories?
> I guess I don't understand the rationale for the change. Categories
> are Emacs's invention, and their purpose is mostly to allow us to use
> regexps for searching certain characters, and other similar
> subtleties. Your rationale seems to be some attempt to be formally
> "consistent". But this is not a formal attribute, it is entirely
> ad-hoc, as can be easily seen by just looking at the list of the
> categories.
The more categories are arbitrary, the less useful they are. Why would anyone
use categories to discriminate characters if they do not have a sensible,
useful and predictable structure? If 'Latin' means 'Latin letters, some
symbols, some whitespace, some control chars, Indo-Arabic digits and the
occasional Greek letter', which it does today, then who can use it correctly?
Consider the function fill-polish-nobreak-p. It is clearly written with the
assumption of a reasonable definition of the Latin category, and it doesn't
work as expected because of that. Those who reviewed that function thought it
looked reasonable, as did I when I read it.
It is perfectly clear that categories have been introduced in an ad-hoc way to
solve problems as they arose, but that doesn't mean that no mistakes were made
even for those narrow purposes.
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Mattias Engdegård, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Eli Zaretskii, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Mattias Engdegård, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Eli Zaretskii, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Mattias Engdegård, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Eli Zaretskii, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories,
Mattias Engdegård <=
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Eli Zaretskii, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Eli Zaretskii, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Mattias Engdegård, 2019/08/15
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Eli Zaretskii, 2019/08/16
- bug#37036: [PATCH] Inconsistent ASCII and Latin char categories, Mattias Engdegård, 2019/08/16