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bug#47657: python-shell font-lock with multi-line input: runaway fontifi
From: |
Lars Ingebrigtsen |
Subject: |
bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length |
Date: |
Mon, 12 Apr 2021 11:32:54 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
JD Smith <jdtsmith@gmail.com> writes:
> `python-shell-font-lock-post-command-hook’ makes the presumption that only a
> single line of input can appear at the prompt. It includes this preparatory
> “clean-up” of its font lock buffer after first having copied all input lines
> after the
> prompt:
>
> (let* ((input (buffer-substring-no-properties
> prompt-end (point-max)))
> ...
> (replacement
> (python-shell-font-lock-with-font-lock-buffer
> (delete-region (line-beginning-position)
> (point-max))
> (setq font-lock-buffer-pos (point))
> (insert input)
I think the point here is that if we're in a multi-line expression, then
the font locking may be dependent on the previous lines, too, so we
can't just delete the contents of the buffer.
> Find an example, below.
[...]
> (In *Python* shell buffer):
>
> In [2]: a= 'now is the time'
> for i in range(12):
> a = 12; print(i+4-4)
> b='one two one two and through and through'
> d='and I’
>
> (In " *Python-font-lock"; this can become arbitrarily long):
>
> a= 'now is the time'
> a= 'now is the time'
I was unable to reproduce this (in Emacs 28). I pasted this into the
*Python* buffer:
a= 'now is the time'
for i in range(12):
a = 12; print(i+4-4)
b='one two one two and through and through'
d='and I'
and the font-lock buffer never became very big.
Do you have a step-by-step recipe, starting from "emacs -Q", to
reproduce this problem?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, JD Smith, 2021/04/08
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length,
Lars Ingebrigtsen <=
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, JD Smith, 2021/04/12
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, Lars Ingebrigtsen, 2021/04/13
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, JD Smith, 2021/04/13
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, Lars Ingebrigtsen, 2021/04/25
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, JD Smith, 2021/04/25
- bug#47657: python-shell font-lock with multi-line input: runaway fontification buffer length, Lars Ingebrigtsen, 2021/04/25