Associating an empty replacement value for "\cr"

Associating an empty replacement value for "\cr"

[fatiparty--- via Users list for the GNU Emacs text editor]

Is this the way to associate an empty replacement value for "\cr".  When I do not place a space after
? I get an error.

(defvar texsym-cluster
 ("\\alpha" . ?α)  ("\\cr" . ? ))

Re: Associating an empty replacement value for "\cr"

[Michael Heerdegen]

fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Is this the way to associate an empty replacement value for "\cr". 
> When I do not place a space after
> ? I get an error.
>
> (defvar texsym-cluster
>  ("\\alpha" . ?α)  ("\\cr" . ? ))

How is that var used?

?c is the read syntax for a character.  There is no "empty" character of
course.  Can you use strings instead as replacements?

Michael.

Associating an empty replacement value for "\cr"

[fatiparty--- via Users list for the GNU Emacs text editor]

> fatiparty--- via Users list for the GNU Emacs text editor
> <help-gnu-emacs@gnu.org> writes:
> 
> > Is this the way to associate an empty replacement value for "\cr". 
> > When I do not place a space after
> > ? I get an error.
> >
> > (defvar texsym-cluster
> >  ("\\alpha" . ?α)  ("\\cr" . ? ))
> 
> How is that var used?
> 
> ?c is the read syntax for a character.  There is no "empty" character of
> course.  Can you use strings instead as replacements?
> 
> Michael.

I have a  keybinding sequence "H-s" that would remove "\cr" text from view 

I am using texsym-cluster in this way

(defun texsym-predicate (start end _match)
  "Prettify mathematical expressions defined by tex syntax.
Matches START with a backslash and END with a word constituent
[a-zA-Z0-9].  Uses the prettify functionality of `prog-mode'."

  (not (or (memq (char-before start) '(?\\))
           (memq (char-syntax (or (char-after end) ?\s)) '(?w))
       (nth 8 (syntax-ppss)))) )

(defun prettify-symbols-cluster ()
  "Set keywords and corresponding glyph."
  (setq-local prettify-symbols-alist texsym-cluster)
  (setq prettify-symbols-compose-predicate 'texsym-predicate))

Jan 12, 2022, 05:19 by help-gnu-emacs@gnu.org:

> Is this the way to associate an empty replacement value for "\cr".  When I do not place a space after
> ? I get an error.
>
> (defvar texsym-cluster
>  ("\\alpha" . ?α)  ("\\cr" . ? ))
>

Re: Associating an empty replacement value for "\cr"

[Tassilo Horn]

fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:

> (defun prettify-symbols-cluster ()
>   "Set keywords and corresponding glyph."
>   (setq-local prettify-symbols-alist texsym-cluster)
>   (setq prettify-symbols-compose-predicate 'texsym-predicate))

Ah, so for usage in `prettify-symbols-alist'.  I guess you could use a
zero-width space as replacement, i.e., ?\N{ZERO WIDTH SPACE}.

Bye,
Tassilo

Associating an empty replacement value for "\cr"

[fatiparty--- via Users list for the GNU Emacs text editor]

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Jan 12, 2022, 07:39 by tsdh@gnu.org:

> fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:
>
>> (defun prettify-symbols-cluster ()
>>   "Set keywords and corresponding glyph."
>>   (setq-local prettify-symbols-alist texsym-cluster)
>>   (setq prettify-symbols-compose-predicate 'texsym-predicate))
>>
>
> Ah, so for usage in `prettify-symbols-alist'.  I guess you could use a
> zero-width space as replacement, i.e., ?\N{ZERO WIDTH SPACE}.
>
> Bye,
> Tassilo
>
Would this be the exact code?

     ("\\cr" . ?\N{ZERO WIDTH SPACE})

Re: Associating an empty replacement value for "\cr"

[Tassilo Horn]

fatiparty@tutanota.com writes:

> > Ah, so for usage in `prettify-symbols-alist'.  I guess you could use a
> > zero-width space as replacement, i.e., ?\N{ZERO WIDTH SPACE}.
> 
> Would this be the exact code?
> 
>      ("\\cr" . ?\N{ZERO WIDTH SPACE})

Yes, I think so.

Bye,
Tassilo

Associating an empty replacement value for "\cr"

[fatiparty--- via Users list for the GNU Emacs text editor]

Jan 12, 2022, 07:49 by help-gnu-emacs@gnu.org:

>
> Jan 12, 2022, 07:39 by tsdh@gnu.org:
>
>> fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:
>>
>>> (defun prettify-symbols-cluster ()
>>>   "Set keywords and corresponding glyph."
>>>   (setq-local prettify-symbols-alist texsym-cluster)
>>>   (setq prettify-symbols-compose-predicate 'texsym-predicate))
>>>
>>
>> Ah, so for usage in `prettify-symbols-alist'.  I guess you could use a
>> zero-width space as replacement, i.e., ?\N{ZERO WIDTH SPACE}.
>>
>> Bye,
>> Tassilo
>>
> Would this be the exact code?
>
>      ("\\cr" . ?\N{ZERO WIDTH SPACE})
>
Ok, I found it in the Elisp Manual {2.4.3.2 General Escape Syntax}.