How do you check if the current point is in a comment or a string? (Was Re: Problems with syntax-ppss: Was [... Apply `comment-depth' text properties when calling `back_comment'.])

[Clément Pit--Claudel]

On 03/09/2016 05:49 AM, Alan Mackenzie wrote:
> (ii) No account is taken of possibly starting a parse-partial-sexp from
>   after the first character of a two character comment starter or ender.
>   OK, this is really a problem with the parser state not recording this
>   situation (which we could correct), but failing that, syntax-ppss
>   should check for this.  We did talk about this (in connection with a
>   CC Mode bug) a few years ago.

I keep running into this, actually. There are plenty of examples out there of 
people checking whether the face at point is font-lock-comment-face or 
font-lock-string-face or font-lock-doc-face to know whether the current point 
is in a comment or string. Using (nth 8 (syntax-ppss)) instead mostly works, 
except that it's nil in comment openers (e.g. in ;; in ELisp) and closers.

Am I missing something?

Clément.

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