GNU bug report logs - #59853
30.0.50; tree-sitter modes have unexpected beginning-of-defun behavior

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From: Theodor Thornhill <theo <at> thornhill.no>
To: Brian Leung <leungbk <at> posteo.net>
Cc: casouri <at> gmail.com, 59853 <at> debbugs.gnu.org
Subject: bug#59853: 30.0.50; tree-sitter modes have unexpected beginning-of-defun behavior
Date: Fri, 09 Dec 2022 16:59:25 +0100

Brian Leung <leungbk <at> posteo.net> writes:

> Theodor Thornhill <theo <at> thornhill.no> writes:
>
>>> 2. When point is anywhere in the first line of the class 
>>> declaration, mark-defun highlights "void otherMethod()", 
>>> instead 
>>> of the entire class declaration.
>>
>> Yeah, I think I've fixed this in a patch I just submitted.
>
> Which commit are you referring to?
>

I believe it was the one I included as a patch here.

>>> 3a. When point is at the [*] in between someMethod and 
>>> otherMethod, narrow-to-defun captures "void otherMethod()". I 
>>> feel 
>>> that since the methods inside the interface declaration have no 
>>> bodies, it makes more sense to capture the entire interface 
>>> definition if point is at [*].
>>
>> Maybe, but I don't believe this is wrong either.
>
> Let me rephrase my request. Consider the following example:
>
>> class Cow implements Animal {
>>   public void animalSound() {
>>     // The body of animalSound() is provided here
>>     System.out.println("The cow says: moo");
>>   }
>>
>> [*]
>>
>>   public void sleep() {
>>     // The body of sleep() is provided here
>>     System.out.println("Zzz");
>>   }
>> }
>
> Both the methods have bodies. If point is at the [*], I would like 
> for narrow-to-defun to capture the entire class declaration, since 
> point is not really contained in either method. (For this 
> particular example, java-mode presently agrees with java-ts-mode.)
>
> Is there a clean way of ensuring that, when point lies between 
> (and is not contained in) those two methods, point is not treated 
> as if it were in one of those methods' tree-sitter nodes?
>

I understand.  I think that either we need to tweak the
treesit-defun-type-regexp or make use of something like:

(treesit-node-on (point) (point)) in the code that searches for
beginning/end-of-defun.

That code should return what you want, right?

>>> 3b. Arguably, even if point were on the method declarations, we 
>>> might still want to (as plain java-mode does) capture the 
>>> entire 
>>> interface definition, since body-less method declarations don't 
>>> feel especially defun-like.
>>
>> Maybe.  Can you try applying the below patch and see if this 
>> changes
>> anything for you?
>
> It captures the entire interface definition only when I remove 
> "method_declaration" (which we probably want to keep) from the 
> regexp.

Yeah.  But I believe Yuan is cooking on some code wrt
beginning/end-of-defun, so maybe we should just wait and see what he
comes up with.

Theo

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