GNU bug report logs - #59534
29.0.50; Improvement for treesit in python.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Nasy <nasyxx <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Improvement for treesit in python.
Date: Wed, 23 Nov 2022 13:53:19 -0600

Hi,

1. Operators

Python added "@" and "@=" as operators in version 3.5 and ":=" in
version 3.8. So I guess these three should be in the
=python--treesit-operators=.

2. Doc strings

Treesit does not consider the content inside the triple quotes at the
beginning of the Python file to be the documents.

For example, lines 2-4 of this file
https://github.com/python/cpython/blob/main/Lib/csv.py#L2-L4

"""
csv.py - read/write/investigate CSV files
"""

It be fontify as string instead of doc.

I changed this function to recognize the outermost single string as the
doc string.

  (defun python--treesit-fontify-string (node override start end &rest _)
    "Fontify string.
  NODE is the string node.  Do not fontify the initial f for
  f-strings.  OVERRIDE is the override flag described in
  `treesit-font-lock-rules'.  START and END mark the region to be
  fontified."
    (let* ((string-beg (treesit-node-start node))
           (string-end (treesit-node-end node))
           (maybe-expression (treesit-node-parent node))
           (maybe-defun (treesit-node-parent
                         (treesit-node-parent
                          maybe-expression)))
           (face (if (and (member (treesit-node-type maybe-defun)
                                  '("function_definition"
-                                   "class_definition"))
+                                   "class_definition"
+                                   nil))
                          ;; This check filters out this case:
                          ;; def function():
                          ;;     return "some string"
                          (equal (treesit-node-type maybe-expression)
                                 "expression_statement"))
                     'font-lock-doc-face
                   'font-lock-string-face)))
      (when (eq (char-after string-beg) ?f)
        (cl-incf string-beg))
      (treesit-fontify-with-override
       (max start string-beg) (min end string-end) face override)))

I'm not familiar with treesit, this solution could not be the best, but
I don't know if there is any other simple way to improve it.  Maybe we
could use something like =python-info-docstring-p= to check if it is doc
or net.



In GNU Emacs 29.0.50 (build 1, aarch64-apple-darwin22.1.0, NS
appkit-2299.00 Version 13.0 (Build 22A380)) of 2022-11-21 built on
Nasys-MacBook-Pro.local
Repository revision: 19954da8dd927f9db4ca95d8a1320207e6c404cd
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.0

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Memory information:
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(symbols 48 57100 178)
(strings 32 224770 106062)
(string-bytes 1 9621013)
(vectors 16 122587)
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Message #8 received at 59534 <at> debbugs.gnu.org (full text, mbox):

From: Yuan Fu <casouri <at> gmail.com>
To: nasyxx <at> gmail.com
Cc: 59534 <at> debbugs.gnu.org
Subject: Re: bug#59534: 29.0.50; Improvement for treesit in python.
Date: Thu, 24 Nov 2022 10:29:47 -0800

Nasy <nasyxx <at> gmail.com> writes:

> Hi,
>
> 1. Operators
>
> Python added "@" and "@=" as operators in version 3.5 and ":=" in
> version 3.8. So I guess these three should be in the
> =python--treesit-operators=.

Thanks! I added them.

> 2. Doc strings
>
> Treesit does not consider the content inside the triple quotes at the
> beginning of the Python file to be the documents.
>
> For example, lines 2-4 of this file
> https://github.com/python/cpython/blob/main/Lib/csv.py#L2-L4
>
> """
> csv.py - read/write/investigate CSV files
> """
>
> It be fontify as string instead of doc.
>
> I changed this function to recognize the outermost single string as the
> doc string.
>
>   (defun python--treesit-fontify-string (node override start end &rest _)
>     "Fontify string.
>   NODE is the string node.  Do not fontify the initial f for
>   f-strings.  OVERRIDE is the override flag described in
>   `treesit-font-lock-rules'.  START and END mark the region to be
>   fontified."
>     (let* ((string-beg (treesit-node-start node))
>            (string-end (treesit-node-end node))
>            (maybe-expression (treesit-node-parent node))
>            (maybe-defun (treesit-node-parent
>                          (treesit-node-parent
>                           maybe-expression)))
>            (face (if (and (member (treesit-node-type maybe-defun)
>                                   '("function_definition"
> -                                   "class_definition"))
> +                                   "class_definition"
> +                                   nil))
>                           ;; This check filters out this case:
>                           ;; def function():
>                           ;;     return "some string"
>                           (equal (treesit-node-type maybe-expression)
>                                  "expression_statement"))
>                      'font-lock-doc-face
>                    'font-lock-string-face)))
>       (when (eq (char-after string-beg) ?f)
>         (cl-incf string-beg))
>       (treesit-fontify-with-override
>        (max start string-beg) (min end string-end) face override)))
>
> I'm not familiar with treesit, this solution could not be the best, but
> I don't know if there is any other simple way to improve it.  Maybe we
> could use something like =python-info-docstring-p= to check if it is doc
> or net.

I added something similar to the function. Now it will highlight the
string in doc-face if there is nothing or only comments before it.

Yuan

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Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.