procyberian/emacs
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Don't distort character ranges in rx translation

Browse source 
The Emacs regexp engine interprets character ranges from ASCII to raw
bytes, such as [a-\xfe], as not including non-ASCII Unicode at all;
ranges from non-ACII Unicode to raw bytes, such as [ü-\x91], are
ignored entirely.

To make rx produce a translation that works as intended, split ranges
that that go from ordinary characters to raw bytes. Such ranges may
appear from set manipulation and regexp optimisation.

* lisp/emacs-lisp/rx.el (rx--generate-alt): Split intervals that
straddle the char-raw boundary when rendering a string regexp from an
interval set.
* test/lisp/emacs-lisp/rx-tests.el (rx-char-any-raw-byte):
Add test cases.
This commit is contained in:
Mattias Engdegård 2023-07-17 13:05:21 +02:00
parent 7446a8c34e
commit 157e735ce8
2 changed files with 17 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
lisp/emacs-lisp/rx.el
View file

@ -484,6 +484,12 @@ classes."
(char-to-string (car item)))
((eq (1+ (car item)) (cdr item))
(string (car item) (cdr item)))
;; Ranges that go between normal chars and raw bytes
;; must be split to avoid being mutilated
;; by Emacs's regexp parser.
((<= (car item) #x3fff7f (cdr item))
(string (car item) ?- #x3fff7f
#x3fff80 ?- (cdr item)))
(t
(string (car item) ?- (cdr item)))))
items nil)