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Re: Case mapping of sharp s
From: |
Stefan Monnier |
Subject: |
Re: Case mapping of sharp s |
Date: |
Sun, 29 Nov 2009 20:22:39 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux) |
> BTW, does anyone know how to put a set of characters into one category
> for the purpose of searching, without affecting case mapping? I.e. to
> not change the current case mappings, but allow a character from one
> category to match all other characters from the same category.
> `set-case-syntax-pair' is not suitable because it does this only for
> a pair of characters and also changes case mappings.
> Of course, it's possible to search with a regexp that matches
> a character set in [...], or more convenient when a space in a regexp
> is substituted with a set of characters from `search-spaces-regexp'.
> I can't find a function like `set-case-syntax-pair' that would define
> a set of equivalent characters for the search, so maybe this is not
> possible.
In theory, there is some amount of support for it via the slot nb 2 of
case tables:
(defun get-eqvcase-table (case-table)
"Return the eqvcase table of CASE-TABLE."
(get-case-table-extra-slot case-table 2))
but AFAIK it's not used by search primitives, which instead implement
case-fold by something like (eq (lower CHAR1) (lower CHAR2)) which is
often cheaper than checking (memq CHAR1 <eqvcase>).
I bumped into it while working on a "lex in Elisp", where using such an
equiv-table makes a lot more sense (it makes the DFA larger, but speeds
up the matching by removing a call to `lower' from the inner loop).
Stefan
- Re: Case mapping of sharp s, (continued)
- Re: Case mapping of sharp s, Ulrich Mueller, 2009/11/21
- Re: Case mapping of sharp s, Andreas Schwab, 2009/11/21
- Re: Case mapping of sharp s, Ulrich Mueller, 2009/11/21
- Re: Case mapping of sharp s, Andreas Schwab, 2009/11/22
- Re: Case mapping of sharp s, Stefan Monnier, 2009/11/22
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/24
- Re: Case mapping of sharp s, grischka, 2009/11/24
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/24
- Re: Case mapping of sharp s, grischka, 2009/11/26
- Re: Case mapping of sharp s, Juri Linkov, 2009/11/29
- Re: Case mapping of sharp s,
Stefan Monnier <=
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/29
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/29
- Re: Case mapping of sharp s, Ulrich Mueller, 2009/11/30
- Re: Case mapping of sharp s, Juri Linkov, 2009/11/30
- Re: Case mapping of sharp s, martin rudalics, 2009/11/30
- Re: Case mapping of sharp s, Juri Linkov, 2009/11/30
- Re: Case mapping of sharp s, Ulrich Mueller, 2009/11/30
- Re: Case mapping of sharp s, Juri Linkov, 2009/11/30