Re: Regarding Emacs, js.el, template-strings and syntax-tables

[Dmitry Gutov]

On 8/24/17 3:31 PM, Anders Lindgren wrote:

> If you use a string face with, say, both a background and a foreground 
> color, it will matter if you *replace* the existing face as opposed to 
> *prepend* a new face on top of it.
>
> For example, the default Ruby mode replace the face,

That is a legacy behavior, as far as I'm concerned. In some other 
editors that I've looked at (e.g. Vim and either Sublime Text or Atom), 
the contents of the interpolation construct look like normal text. You 
can have nested strings and interpolations inside them, so it's a good 
semantic cue.

> --------
>
> One question is if the delimiters around the expression should be 
> highlighted as well? In Ruby they are highlighted. In my 
> cmake-font-lock[1] package I have opted not to highlight them, as it 
> makes it easier to read the variable name:

If the contents are highlighted differently, the variable name will 
stand out just the same, even with the delimiters highlighted.


> In all cases I've seen, the content is displayed using 
> `font-lock-variable-name-face', even for the cases where the content is 
> more complex than a plain variable. I would say that this is OK, as they 
> stand out and, most of the time, it is a plain variable anyway.

We don't use font-lock-variable-name-face for "plain variables" outside 
of strings, though. Not in ruby-mode, at least.