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bug#68445: [PATCH] Problem with python--treesit-syntax-propertize


From: Dmitry Gutov
Subject: bug#68445: [PATCH] Problem with python--treesit-syntax-propertize
Date: Mon, 22 Jan 2024 20:52:58 +0200
User-agent: Mozilla Thunderbird

On 22/01/2024 17:44, kobarity wrote:
Hi,

Dmitry Gutov wrote:
On 21/01/2024 16:47, kobarity wrote:
I am resending my mail, as I made a mistake in X-Debbugs-CC.
Was it supposed to appear in the bug's thread? I don't see it anywhere.

My first mail was registered as Bug#68445, and my patch is there.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=68445

It says:

Report forwarded to casouri <at> gmail.com, dmitry@.gutov.dev, bug-gnu-emacs 
<at> gnu.org:

The extra period is my mistake and it may have caused the problem.
I'm sorry for the confusion.

Yeah, but even so that's odd: I'm subscribed to the bug tracker, so the email should have at least arrived in my inbox, but it did not.

I think there is also another approach--handle two different types of
nodes separately, instead of just string_content, so we don't have to
start from the beginning of the literal. Like this:

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index e2f614f52c2..4f8b0cb9473 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1361,13 +1361,15 @@ python--treesit-syntax-propertize
      (while (re-search-forward (rx (or "\"\"\"" "'''")) end t)
        (let ((node (treesit-node-at (point))))
          ;; The triple quotes surround a non-empty string.
-        (when (equal (treesit-node-type node) "string_content")
-          (let ((start (treesit-node-start node))
-                (end (treesit-node-end node)))
-            (put-text-property (1- start) start
-                               'syntax-table (string-to-syntax "|"))
-            (put-text-property end (min (1+ end) (point-max))
-                               'syntax-table (string-to-syntax "|"))))))))
+        (cond
+         ((equal (treesit-node-type node) "string_content")
+          (put-text-property (1- (treesit-node-start node))
+                             (treesit-node-start node)
+                             'syntax-table (string-to-syntax "|")))
+         ((and (equal (treesit-node-type node) "string_end")
+               (= (treesit-node-start node) (- (point) 3)))
+          (put-text-property (- (point) 3) (- (point) 2)
+                             'syntax-table (string-to-syntax "|"))))))))

  
  ;;; Indentation


This approach seems better than my patch, but it does not seem to
address the following special case.

#+begin_src python
"""a""""""b"""
#+end_src

All right, try the patch below, please. It also covers the case of the empty literal.

I've tried to find a case where it would behave poorly (e.g. by misdetecting three quotes from a combination of some other string literals), but couldn't. E.g.,

  s = '''asdasd'

is not a concatenation. It's always an error, at least according to the TS grammar.

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index e2f614f52c2..41f612c8b1c 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1359,15 +1359,15 @@ python--treesit-syntax-propertize
   (save-excursion
     (goto-char start)
     (while (re-search-forward (rx (or "\"\"\"" "'''")) end t)
-      (let ((node (treesit-node-at (point))))
-        ;; The triple quotes surround a non-empty string.
-        (when (equal (treesit-node-type node) "string_content")
-          (let ((start (treesit-node-start node))
-                (end (treesit-node-end node)))
-            (put-text-property (1- start) start
-                               'syntax-table (string-to-syntax "|"))
-            (put-text-property end (min (1+ end) (point-max))
-                               'syntax-table (string-to-syntax "|"))))))))
+      (let ((node (treesit-node-at (- (point) 3))))
+        ;; Handle triple-quoted strings.
+        (pcase (treesit-node-type node)
+          ("string_start"
+           (put-text-property (1- (point)) (point)
+                              'syntax-table (string-to-syntax "|")))
+          ("string_end"
+           (put-text-property (- (point) 3) (- (point) 2)
+                              'syntax-table (string-to-syntax "|"))))))))

 
 ;;; Indentation







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