GNU bug report logs - #60256
29.0.60; Maybe improve tree sitter default treesit-language-at function

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Package: emacs; Reported by: Wilhelm H Kirschbaum <wilhelm@HIDDEN>; Keywords: wontfix; dated Thu, 22 Dec 2022 10:35:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) wontfix. Request was from Eli Zaretskii <eliz@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Yuan Fu <casouri@HIDDEN>
In-Reply-To: <ABFC83CF-9758-41BF-9993-210F507CC9C8@HIDDEN> (message from
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Subject: Re: bug#60256: 29.0.60; Maybe improve tree sitter default 
 treesit-language-at function
References: <ABFC83CF-9758-41BF-9993-210F507CC9C8@HIDDEN>
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tags 60256 wontfix
thanks

> From: Yuan Fu <casouri@HIDDEN>
> Date: Sat, 24 Dec 2022 14:43:18 -0800
> Cc: Wilhelm Hugo Kirschbaum <wilhelm@HIDDEN>,
>  60256 <at> debbugs.gnu.org
> 
> 
> Yeah, sorry for the delay. I don’t think it’s worth it, because (1) I
> expect major modes with multiple langauges to implement
> treesit-language-at-point-function which takes care of all the work, and
> (2) in the rare case where there are multiple languages and no
> treesit-language-at-point-function, using the first language whose range
> spans point (this patch) is not necessarily correct: the host language (eg, HTML
> among HTML, CSS & JavaScript) always covers the whole buffer, only
> embedded languages has ranges.

OK, thanks.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#60256; Package emacs. Full text available.

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Subject: Re: bug#60256: 29.0.60; Maybe improve tree sitter default 
 treesit-language-at function
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Date: Sat, 24 Dec 2022 14:43:18 -0800
To: Eli Zaretskii <eliz@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Wilhelm H Kirschbaum <wilhelm@HIDDEN>
>> Date: Thu, 22 Dec 2022 12:30:09 +0200
>>=20
>>=20
>> We can detect the language from treesit-parser-included-ranges, so
>> instead of taking the first parser from the list what about taking=20
>> the first parser within known ranges?
>
> Yuan, any comments?

Yeah, sorry for the delay. I don=E2=80=99t think it=E2=80=99s worth it, =
because (1) I
expect major modes with multiple langauges to implement
treesit-language-at-point-function which takes care of all the work, and
(2) in the rare case where there are multiple languages and no
treesit-language-at-point-function, using the first language whose range
spans point (this patch) is not necessarily correct: the host language =
(eg, HTML
among HTML, CSS & JavaScript) always covers the whole buffer, only
embedded languages has ranges.

Yuan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#60256; Package emacs. Full text available.

Message received at 60256 <at> debbugs.gnu.org:


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Subject: Re: bug#60256: 29.0.60;
 Maybe improve tree sitter default treesit-language-at function
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> From: Wilhelm H Kirschbaum <wilhelm@HIDDEN>
> Date: Thu, 22 Dec 2022 12:30:09 +0200
> 
> 
> We can detect the language from treesit-parser-included-ranges, so
> instead of taking the first parser from the list what about taking 
> the first parser within known ranges?

Yuan, any comments?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#60256; Package emacs. Full text available.

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Subject: 29.0.60; Maybe improve tree sitter default treesit-language-at
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We can detect the language from treesit-parser-included-ranges, so
instead of taking the first parser from the list what about taking 
the
first parser within known ranges?

diff --git a/lisp/treesit.el b/lisp/treesit.el
index 6407669118..f08bb1cd40 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -136,8 +136,20 @@ treesit-language-at
 parser in `treesit-parser-list', or nil if there is no parser."
   (if treesit-language-at-point-function
       (funcall treesit-language-at-point-function position)
-    (when-let ((parser (car (treesit-parser-list))))
-      (treesit-parser-language parser))))
+    (let ((language-in-range
+         (cl-loop
+          for parser in (treesit-parser-list)
+          do (setq range
+                   (cl-loop
+                    for range in (treesit-parser-included-ranges 
parser)
+                    if (and (>= point (car range)) (<= point (cdr 
range)))
+                    return parser))
+          if range
+          return (treesit-parser-language parser))))
+    (if (null language-in-range)
+        (when-let ((parser (car (treesit-parser-list))))
+          (treesit-parser-language parser))
+      language-in-range))))


Maybe there is a better way of doing this, but seems like it can 
be
generic enough to make this work without having to set
treesit-language-at-point-function for the majority of the cases.

Wilhelm
Acknowledgement sent to Wilhelm H Kirschbaum <wilhelm@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#60256; Package emacs. Full text available.
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