Re: 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" <clement.pit@gmail.com>]

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On 03/10/2016 10:20 AM, Stefan Monnier wrote:
>> Thanks for the clarification. What's the recommended way to check if the
>> point is in a comment, then? I'm thinking for example of adjusting
>> fill-nobreak-predicate, or similar things.
> 
> The recommended way is
> 
>    (nth 8 (syntax-ppss))
> 
> Whether "/<point>*" is inside the comment or not is very debatable, and
> luckily it rarely matters.  So if/when it matters and syntax-ppss's
> answer isn't the one we need, then we can discuss the better replacement
> for that specific case, but the specifics will matter then.

Cool, thanks Stefan, As long as this behaviour is consistent with the rest of Emacs, that's fine by me.

Here's one case where it matters: in tuareg-mode (for OCaml), with the following code:

  (<point>* comment *)

The call to (prettify-symbols-default-compose-p (point) (1+ (point)) nil) returns t.
On the other hand, the same call with the point as follows returns nil:

  (*<point> comment *)

This makes it unreliable to prettify * to × in tuareg mode.
I'll report a bug for prettify-symbols-mode.

Clément.


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