There was a recent fix to the syntax class for the single quote,
https://sourceforge.net/p/matlab-emacs/src/ci/a5e88cda8e0715f117f09e6101f39302387f2d6b/
I'm not familiar with electric pair mode but tried it and it seems to work for
the case you mentioned. Some downsides I noticed with it was (2) trying to
transpose a variable, typing a single quote at end of variable results in two
single quotes and you need to delete (C-d) the extra single quote. (2) If you
try to escape a quote in a string, it adds an extra quote.
John
________________________________
From: Eric Ludlam <ericlud...@gmail.com>
Sent: Monday, April 25, 2022 10:11 AM
To: Peter Mao <peter....@gmail.com>
Cc: matlab-emacs-discuss <matlab-emacs-discuss@lists.sourceforge.net>
Subject: Re: [Matlab-emacs-discuss] matlab-mode, electric-pair-mode and the
single quote (')
Hi Peter,
MATLAB's use of ' char for strings is a bit tricky, because it has many
meanings, such as:
* 'this is a string'
* 'in a string '' first quote is escape for second quote'
* this is a transpose'
I'm not sure when the electric pair mode does it's thing, but if it tries to
pair up a ' when you type it, but then later the matlab-mode scanner
re-attributes it as punctuation (because it is transpose) or escape (because it
is doubled up) I can imagine some confusion.
As such, matlab-mode has special support for paren-mode. I might recommend
turning off electric-pair-mode in matlab-mode, and turning on paren-mode
instead. I know it isn't the same, but as I scan through elec-pair.el, I don't
see much opportunity for matlab-mode to customize it for the special syntax
features.
It may be possible that setting `electric-pair-string-bound-function' to
'point-at-eol' in MATLAB buffers might help, since strings can't extend past
one line, but I suspect the real problem is in the timing of the insert action
since elec-pair uses edit hooks, and matlab fixes the syntax during a
syntax-ppss call (ie - during font lock, or navigation keypress)
Maybe someone else on the list knows other ways to customize elec-pair can
offer a suggestion. cc-mode does similar stuff with syntax-propertize, and
must have some fixes for elec-pair.
Eric
On Sat, Apr 23, 2022 at 3:33 PM Peter Mao
<peter....@gmail.com<mailto:peter....@gmail.com>> wrote:
note: I formatted this email in markdown for readability (let me know if
there's a better way).
I use **electric-pair-mode**. If you don't you can turn it on locally with
```
(electric-pair-local-mode t)
```
to see what the issue is.
Briefly, with **electric-pair-mode** on (locally or globally), If I type the
characters `(abc)def`, I get the same output. The characters that pair are the
ones in the syntax table (use `describe-syntax' to see it) that are of type
"open", "close", or "string".
In **matlab-mode**, the pairs (), [], {} (all "open"/"close" type) work fine,
as does the "string" type delimiter " (aka, double-quote, #x22, ?") because it
is listed in the variable `electric-pair-pairs`. The only one that does NOT
work is the "string" type delimiter ' (aka, single-quote, #x27, ?'). So with
the `(abc)def` example above, with #x27, I get:
```
'abc'def'
```
Note the single-quote at the end of the output string after the `f`.
With some exploration of other modes, I have found that **perl-mode** also uses
#x27 as a string delimiter in its syntax table, but it gives the correct output
with my test input string.
I will look into this, but if someone else with more experience coding syntax
handling gets to it before me, that would be wonderful.
thanks,
Peter
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