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Re: search-default-mode char-fold-to-regexp and Greek Extended block cha
From:
Robert Pluim
Subject:
Re: search-default-mode char-fold-to-regexp and Greek Extended block characters
Date:
2019年7月21日 13:03:37 +0200
>>>>> On 2019年7月19日 21:13:02 +0300, Eli Zaretskii <address@hidden> said:
Eli> (get-char-code-property ?ί 'decomposition) => (943) ; (#x03af) i.e
(?ί)
Eli> (get-char-code-property ?ί 'decomposition) => (953 769) ; (#x03b9
#x0301)
Eli> Do we expand the decomposition property recursively? It sounds like
Eli> we don't, but maybe we should.
We donʼt. The following patch allows searching for ι (0x3b9) to match
both ί (0x3af) and ί (1f77). It doesnʼt recurse, but I have no idea if
there are longer chains of decompositions.
It causes
(aref char-fold-table ?ι)
to expand from:
"\\(?:ι[̀́̄̆̈̓̔͂]\\|[ίιϊἰἱὶιῐῑῖιιιιι]\\)"
to:
"\\(?:ι[̀́̄̆̈̓̔͂]\\|[ΐίιϊἰ-ἷὶίιῐῑῒῖῗιιιιι]\\)"
where the additions are basically all the variants of IOTA + one or
more diacritical
Even if we donʼt apply this or something like it, itʼs been
educational.
diff --git i/lisp/char-fold.el w/lisp/char-fold.el
index 9d3ea17b41..bf2a4c2484 100644
--- i/lisp/char-fold.el
+++ w/lisp/char-fold.el
@@ -78,6 +78,20 @@
(cons (char-to-string char)
(aref equiv (car decomp))))))))
(funcall make-decomp-match-char decomp char)
+ ;; Check to see if the first char of the decomposition
+ ;; has a further decomposition. If so, add a mapping
+ ;; back from that second decomposition to the original
+ ;; character. This allows e.g. 'ι' (GREEK SMALL LETTER
+ ;; IOTA) to match both the Basic Greek block and
+ ;; Extended Greek block variants of IOTA +
+ ;; diacritical(s)
+ (let ((l2-decomp (char-table-range table (car decomp))))
+ (when (consp l2-decomp)
+ (when (symbolp (car l2-decomp))
+ (setq l2-decomp (cdr l2-decomp)))
+ (if (not (eq (car decomp)
+ (car l2-decomp)))
+ (funcall make-decomp-match-char (list (car l2-decomp))
char))))
;; Do it again, without the non-spacing characters.
;; This allows 'a' to match 'ä'.
(let ((simpler-decomp nil)
- search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月19日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Eli Zaretskii, 2019年07月19日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月19日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Eli Zaretskii, 2019年07月19日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters,
Robert Pluim <=
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月22日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Eli Zaretskii, 2019年07月23日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月23日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Juri Linkov, 2019年07月23日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月24日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月24日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Robert Pluim, 2019年07月24日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Juri Linkov, 2019年07月24日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Basil L. Contovounesios, 2019年07月24日
- Re: search-default-mode char-fold-to-regexp and Greek Extended block characters , Juri Linkov, 2019年07月25日