* bug#38191: incorrect text properties in result of `format' with multibyte(?) characters
@ 2019-11-13 0:31 Paul Pogonyshev
2019-11-14 5:30 ` Lars Ingebrigtsen
2019-11-14 22:46 ` Paul Eggert
0 siblings, 2 replies; 3+ messages in thread
From: Paul Pogonyshev @ 2019-11-13 0:31 UTC (permalink / raw)
To: 38191
"Multibyte" is a guess, I don't really know the underlying reason.
Examples:
(format (propertize "`foo' %s bar" 'face 'bold) "xxx")
=> #("`foo' xxx bar" 0 13 (face bold))
(format (propertize "‘foo’ %s bar" 'face 'bold) "xxx")
=> #("‘foo’ xxx bar" 0 10 (face bold))
Length of the string is the same in both cases. In the first example
the face is correctly applied to the whole string, in the second
example 3 last characters incorrectly lack a face.
This is a regression, it used to work correctly before, but I don't
know when it became broken.
Tested on: GNU Emacs 27.0.50 (build 3, x86_64-pc-linux-gnu, GTK+
Version 2.24.32) of 2019-11-13
Paul
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#38191: incorrect text properties in result of `format' with multibyte(?) characters
2019-11-13 0:31 bug#38191: incorrect text properties in result of `format' with multibyte(?) characters Paul Pogonyshev
@ 2019-11-14 5:30 ` Lars Ingebrigtsen
2019-11-14 22:46 ` Paul Eggert
1 sibling, 0 replies; 3+ messages in thread
From: Lars Ingebrigtsen @ 2019-11-14 5:30 UTC (permalink / raw)
To: Paul Pogonyshev; +Cc: 38191
Paul Pogonyshev <pogonyshev@gmail.com> writes:
> "Multibyte" is a guess, I don't really know the underlying reason.
>
> Examples:
>
> (format (propertize "`foo' %s bar" 'face 'bold) "xxx")
> => #("`foo' xxx bar" 0 13 (face bold))
>
> (format (propertize "‘foo’ %s bar" 'face 'bold) "xxx")
> => #("‘foo’ xxx bar" 0 10 (face bold))
>
> Length of the string is the same in both cases. In the first example
> the face is correctly applied to the whole string, in the second
> example 3 last characters incorrectly lack a face.
>
> This is a regression, it used to work correctly before, but I don't
> know when it became broken.
It's always off by the length of the inserted string, so it's at least
systematic:
(format (propertize "ççfoo %s bar" 'face 'bold) "xxx")
=> #("ççfoo xxx bar" 0 10 (face bold))
(format (propertize "ççfoo %s bar" 'face 'bold) "xxxx")
=> #("ççfoo xxxx bar" 0 10 (face bold))
It doesn't happen if there's just one multibyte character in the format
spec -- there has to be two or more.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 3+ messages in thread
* bug#38191: incorrect text properties in result of `format' with multibyte(?) characters
2019-11-13 0:31 bug#38191: incorrect text properties in result of `format' with multibyte(?) characters Paul Pogonyshev
2019-11-14 5:30 ` Lars Ingebrigtsen
@ 2019-11-14 22:46 ` Paul Eggert
1 sibling, 0 replies; 3+ messages in thread
From: Paul Eggert @ 2019-11-14 22:46 UTC (permalink / raw)
To: Paul Pogonyshev; +Cc: 38191-done
[-- Attachment #1: Type: text/plain, Size: 69 bytes --]
Thanks for reporting that. I installed the attached patch to fix it.
[-- Attachment #2: 0001-Fix-byte-counting-error-in-format.patch --]
[-- Type: text/x-patch, Size: 2619 bytes --]
From 63aafe766e7d81aa7b2e75bddf2ce3eca4611ae5 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 14 Nov 2019 14:42:39 -0800
Subject: [PATCH] =?UTF-8?q?Fix=20byte-counting=20error=20in=20=E2=80=98for?=
=?UTF-8?q?mat=E2=80=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Problem reported by Paul Pogonyshev (Bug#38191).
* src/editfns.c (styled_format): When checking for adjacent
%-sequences, use byte position rather than character position.
* test/src/editfns-tests.el (format-properties): Test for fix.
---
src/editfns.c | 6 +++---
test/src/editfns-tests.el | 4 ++++
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/src/editfns.c b/src/editfns.c
index 1b33f39711..8fc866d391 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -3143,7 +3143,7 @@ styled_format (ptrdiff_t nargs, Lisp_Object *args, bool message)
/* The start and end bytepos in the output string. */
ptrdiff_t start, end;
- /* The start of the spec in the format string. */
+ /* The start bytepos of the spec in the format string. */
ptrdiff_t fbeg;
/* Whether the argument is a string with intervals. */
@@ -3954,7 +3954,7 @@ styled_format (ptrdiff_t nargs, Lisp_Object *args, bool message)
{
position++;
if (fieldn < nspec
- && position > info[fieldn].fbeg
+ && bytepos >= info[fieldn].fbeg
&& translated == info[fieldn].start)
{
translated += info[fieldn].end - info[fieldn].start;
@@ -3976,7 +3976,7 @@ styled_format (ptrdiff_t nargs, Lisp_Object *args, bool message)
{
position++;
if (fieldn < nspec
- && position > info[fieldn].fbeg
+ && bytepos >= info[fieldn].fbeg
&& translated == info[fieldn].start)
{
translated += info[fieldn].end - info[fieldn].start;
diff --git a/test/src/editfns-tests.el b/test/src/editfns-tests.el
index a1060808f6..238fb409f0 100644
--- a/test/src/editfns-tests.el
+++ b/test/src/editfns-tests.el
@@ -90,6 +90,10 @@ format-properties
(propertize "45" 'face 'italic)))
#("012345 "
0 2 (face bold) 2 4 (face underline) 4 10 (face italic))))
+ ;; Bug #38191
+ (should (ert-equal-including-properties
+ (format (propertize "‘foo’ %s bar" 'face 'bold) "xxx")
+ #("‘foo’ xxx bar" 0 13 (face bold))))
;; Bug #32404
(should (ert-equal-including-properties
(format (concat (propertize "%s" 'face 'bold)
--
2.23.0
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2019-11-13 0:31 bug#38191: incorrect text properties in result of `format' with multibyte(?) characters Paul Pogonyshev
2019-11-14 5:30 ` Lars Ingebrigtsen
2019-11-14 22:46 ` Paul Eggert
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