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Re: [prettify-symbols-mode] Two consecutive matches don't work?
From: |
Tassilo Horn |
Subject: |
Re: [prettify-symbols-mode] Two consecutive matches don't work? |
Date: |
Wed, 18 May 2022 12:54:41 +0200 |
User-agent: |
mu4e 1.7.21; emacs 29.0.50 |
Robert Pluim <rpluim@gmail.com> writes:
> Joost> I'm dealing with some `.xml` files that contain data which uses the
> Joost> sequence `<<!` as some sort of operator. Because it's XML, the
> Joost> LESS-THAN sign needs to be encoded as `<`, yielding `<<!`.
>
> Joost> So I thought this would be the ideal use case for
> Joost> `prettify-symbols-mode`. I added `("<" . ?<)` to
> Joost> `prettify-symbols-alist` and activated the mode.
>
> Joost> Unfortunately, only the first `<` in each sequence is
> Joost> prettified. This seems to be due to the fact that the second
> `<` is
> Joost> followed by the exclamation mark: if I insert a space in between,
> Joost> prettification works.
>
> Joost> Is there any way to remedy this?
>
> Looks like a bug to me. I tried "<<", but exhibits the same
> behaviour.
The problem is that in <a><<</a> (symbol-at-point) on the first
< says "<a><" and on the second "<". I think there might be even
two bugs:
1. nxml-mode: It feels wrong that <a>< is considered a symbol. And
that the closing ; isn't part of the symbol < seems also not
correct. And why do < and > have symbol syntax. Wouldn't
open/close paren be more appropriate?
2. prettify-symbols: It seems wrong that the second < is prettified
because its not a single symbol but a symbol < plus the character
; which as punctuation syntax.
Bye,
Tassilo