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Re: How do you check if the current point is in a comment or a string? (
From: |
Stefan Monnier |
Subject: |
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'.]) |
Date: |
Thu, 10 Mar 2016 09:28:00 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) |
>> (nth 8 (syntax-ppss)) works fine for me in something like ";; some
>> comment in an emacs-lisp-mode buffer"; it returns the starting point
>> of the comment.
> Does it really? For me it returns nil when the point is as shown below:
> <point>;; some comment in an emacs-lisp-mode buffer
That's correct, because point is *not* inside the comment.
> In all these cases, the font trick works.
Here it's because `get-text-property' returns the property of the
character after point, and indeed this is ";" which is in the comment.
IOW they're both correct because they don't ask the same thing.
> In C mode, it returns nil in the following two positions:
>
> /<point>/ asd
> <point>// asd
>
> As well as these two:
>
> <point>/* asd */
> /<point>* asd */
Indeed, this is a current problem with parse-partial-sexp (and hence
syntax-ppss) and is directly related to what Alan was referring to.
Given the way parse-partial-sexp works (i.e. it can only look at the
text that precedes), even if we fix it, parse-partial-sexp wouldn't be
able to tell you that <point> is inside a comment. But it could tell
you that it's in the middle of something that could turn out to be
a comment.
Stefan
- Re: Problems with syntax-ppss: Was [... Apply `comment-depth' text properties when calling `back_comment'.], (continued)
- Re: Problems with syntax-ppss: Was [... Apply `comment-depth' text properties when calling `back_comment'.], Stefan Monnier, 2016/03/10
- 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, 2016/03/09
- 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'.]), Kaushal Modi, 2016/03/09
- 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, 2016/03/09
- 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'.]), Kaushal Modi, 2016/03/09
- 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, 2016/03/09
- 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'.]),
Stefan Monnier <=
- 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, 2016/03/10
- 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'.]), Stefan Monnier, 2016/03/10
- 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, 2016/03/10
- 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'.]), Andreas Röhler, 2016/03/12
- 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, 2016/03/12
Re: [Emacs-diffs] comment-cache 223d16f 2/3: Apply `comment-depth' text properties when calling `back_comment'., Richard Stallman, 2016/03/09