[`pylint`] Add U+061C to `PLE2502` #20106

kotx · 2025-08-26T21:52:05Z

Resolves #20058

ntBre

Thank you!

I'm a bit conflicted because this clearly seems within the original intent of the rule, but a conservative reading of our versioning guidelines suggests that this needs to be a preview change since it increases the scope of a stable rule.

Would you mind making this a preview change? You can find examples of our preview checks in this file:

ruff/crates/ruff_linter/src/preview.rs

Lines 254 to 257 in e5e217f

    
           // https://github.com/astral-sh/ruff/pull/19851 
        
           pub(crate) const fn is_maxsplit_without_separator_fix_enabled(settings: &LinterSettings) -> bool { 
        
               settings.preview.is_enabled() 
        
           }

and I'd recommend making a copy of the test function here with preview enabled (often called preview_rules):

ruff/crates/ruff_linter/src/rules/pylint/mod.rs

Line 237 in e5e217f

fn rules(rule_code: Rule, path: &Path) -> Result<()> {

with just one test_case for bidirectional_unicode.py.

We'll probably want to move the character out of BIDI_UNICODE for now and combine it with the preview check, but what you have here is perfect once we stabilize the behavior.

github-actions · 2025-08-27T19:08:16Z

`ruff-ecosystem` results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

kotx · 2025-08-27T19:43:39Z

@ntBre The guidelines say minor version is bumped when "The scope of a stable rule is significantly increased" (emphasis added). Is this significant enough to warrant a preview change? Will proceed if this is the case (thank you for the detailed instructions!).

ntBre · 2025-08-27T21:06:55Z

Yeah, that's why I was conflicted. I guess I consider it significant within the niche of the rule itself, and it just errs on the safe side to keep it in preview. It's also a departure from the upstream pylint rule based on a quick test I just did, which is another reason.

ntBre · 2025-08-28T15:48:13Z

Thank you! This looks good overall. I did try to push one small patch to put the new test case back in bidirectional_unicode.py instead of a separate _preview file. That will make it a little easier to update things when we stabilize the change. But I couldn't push to the PR branch for some reason. Would you mind applying this patch or making similar changes? This is good to go otherwise.

Patch

diff --git a/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode.py b/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode.py
index 25accb3aad..f72695d0c4 100644
--- a/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode.py
+++ b/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode.py
@@ -4,6 +4,9 @@ print("שלום‬")
 # E2502
 example = "x‏" * 100  #    "‏x" is assigned
 
+# E2502
+another = "x؜" * 50  #    "؜x" is assigned
+
 # E2502
 if access_level != "none‮⁦":  # Check if admin ⁩⁦' and access_level != 'user
     print("You are an admin.")
diff --git a/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode_preview.py b/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode_preview.py
deleted file mode 100644
index 1445423c99..0000000000
--- a/crates/ruff_linter/resources/test/fixtures/pylint/bidirectional_unicode_preview.py
+++ /dev/null
@@ -1,11 +0,0 @@
-# E2502
-hello = "x؜" * 50  #    "؜x" is assigned
-
-# OK
-print("\u061C")
-
-# OK
-print("\N{ARABIC LETTER MARK}")
-
-# OK
-print("Hello World")
diff --git a/crates/ruff_linter/src/rules/pylint/mod.rs b/crates/ruff_linter/src/rules/pylint/mod.rs
index 9d2d26072e..e181c0a146 100644
--- a/crates/ruff_linter/src/rules/pylint/mod.rs
+++ b/crates/ruff_linter/src/rules/pylint/mod.rs
@@ -252,12 +252,13 @@ mod tests {
         Ok(())
     }
 
-    #[test_case(
-        Rule::BidirectionalUnicode,
-        Path::new("bidirectional_unicode_preview.py")
-    )]
+    #[test_case(Rule::BidirectionalUnicode, Path::new("bidirectional_unicode.py"))]
     fn preview_rules(rule_code: Rule, path: &Path) -> Result<()> {
-        let snapshot = format!("{}_{}", rule_code.noqa_code(), path.to_string_lossy());
+        let snapshot = format!(
+            "preview__{}_{}",
+            rule_code.noqa_code(),
+            path.to_string_lossy()
+        );
         let diagnostics = test_path(
             Path::new("pylint").join(path).as_path(),
             &LinterSettings {
diff --git a/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLE2502_bidirectional_unicode.py.snap b/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLE2502_bidirectional_unicode.py.snap
index 18356831d7..0d584e8108 100644
--- a/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLE2502_bidirectional_unicode.py.snap
+++ b/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLE2502_bidirectional_unicode.py.snap
@@ -22,21 +22,21 @@ PLE2502 Contains control characters that can permit obfuscated code
   |
 
 PLE2502 Contains control characters that can permit obfuscated code
- --> bidirectional_unicode.py:8:1
-  |
-7 | # E2502
-8 | if access_level != "none":  # Check if admin ' and access_level != 'user
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-9 |     print("You are an admin.")
-  |
+  --> bidirectional_unicode.py:11:1
+   |
+10 | # E2502
+11 | if access_level != "none":  # Check if admin ' and access_level != 'user
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+12 |     print("You are an admin.")
+   |
 
 PLE2502 Contains control characters that can permit obfuscated code
-  --> bidirectional_unicode.py:14:1
+  --> bidirectional_unicode.py:17:1
    |
-12 | # E2502
-13 | def subtract_funds(account: str, amount: int):
-14 |     """Subtract funds from bank account then """
+15 | # E2502
+16 | def subtract_funds(account: str, amount: int):
+17 |     """Subtract funds from bank account then """
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-15 |     return
-16 |     bank[account] -= amount
+18 |     return
+19 |     bank[account] -= amount
    |
diff --git a/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__preview__PLE2502_bidirectional_unicode.py.snap b/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__preview__PLE2502_bidirectional_unicode.py.snap
new file mode 100644
index 0000000000..4a1555ebe8
--- /dev/null
+++ b/crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__preview__PLE2502_bidirectional_unicode.py.snap
@@ -0,0 +1,52 @@
+---
+source: crates/ruff_linter/src/rules/pylint/mod.rs
+---
+PLE2502 Contains control characters that can permit obfuscated code
+ --> bidirectional_unicode.py:2:1
+  |
+1 | # E2502
+2 | print("שלום")
+  | ^^^^^^^^^^^^^
+3 |
+4 | # E2502
+  |
+
+PLE2502 Contains control characters that can permit obfuscated code
+ --> bidirectional_unicode.py:5:1
+  |
+4 | # E2502
+5 | example = "x‏" * 100  #    "‏x" is assigned
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+6 |
+7 | # E2502
+  |
+
+PLE2502 Contains control characters that can permit obfuscated code
+  --> bidirectional_unicode.py:8:1
+   |
+ 7 | # E2502
+ 8 | another = "x؜" * 50  #    "؜x" is assigned
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ 9 |
+10 | # E2502
+   |
+
+PLE2502 Contains control characters that can permit obfuscated code
+  --> bidirectional_unicode.py:11:1
+   |
+10 | # E2502
+11 | if access_level != "none":  # Check if admin ' and access_level != 'user
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+12 |     print("You are an admin.")
+   |
+
+PLE2502 Contains control characters that can permit obfuscated code
+  --> bidirectional_unicode.py:17:1
+   |
+15 | # E2502
+16 | def subtract_funds(account: str, amount: int):
+17 |     """Subtract funds from bank account then """
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+18 |     return
+19 |     bank[account] -= amount
+   |

This is mostly restoring the test case you had before, which is the only reason I was going to push it quickly and then merge instead of bothering you again :)

kotx · 2025-08-28T19:01:42Z

@ntBre pushed!

...t/snapshots/ruff_linter__rules__pylint__tests__PLE2502_bidirectional_unicode_preview.py.snap

ntBre · 2025-08-28T20:01:40Z

Did you fix the clippy error too? I think it just wanted you to combine your if branches with an ||. I noticed that but wasn't going to comment since I think it's easier to read this way, but clippy wasn't so generous 😆

kotx · 2025-08-28T20:14:40Z

You're right, I had totally missed that! Fixed

ntBre

Thanks!

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

Resolves astral-sh#20058

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

Add U+061C to PLE2502

87e8386

ntBre reviewed Aug 27, 2025

View reviewed changes

ntBre added rule Implementing or modifying a lint rule preview Related to preview mode features labels Aug 27, 2025

kotx added 3 commits August 27, 2025 16:58

Move PLE2502 U+061C lint and tests to preview

48fb194

Remove U+061C from bidi test

8ac6d70

Make preview rules actually preview

fda3b21

kotx requested a review from ntBre August 28, 2025 02:02

Move test from preview file

44cf625

ntBre reviewed Aug 28, 2025

View reviewed changes

...t/snapshots/ruff_linter__rules__pylint__tests__PLE2502_bidirectional_unicode_preview.py.snap Outdated Show resolved Hide resolved

Remove unused snapshot

2646df6

Fix clippy lint

0fb4472

ntBre approved these changes Aug 28, 2025

View reviewed changes

ntBre changed the title ~~Add U+061C to PLE2502~~ [pylint] Add U+061C to PLE2502 Aug 28, 2025

ntBre merged commit b6522cb into astral-sh:main Aug 28, 2025
35 checks passed

BrewTestBot mentioned this pull request Sep 4, 2025

ruff 0.12.12 Homebrew/homebrew-core#236182

Merged

dylwil3 mentioned this pull request Sep 5, 2025

[pylint] Stabilize adding U+061C to bidirectional-unicode (PLE2502) #20276

Merged

dylwil3 added a commit that referenced this pull request Sep 5, 2025

[pylint] Stabilize adding U+061C to bidirectional-unicode (`PLE25…

fcb2d6d

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

ntBre pushed a commit that referenced this pull request Sep 8, 2025

[pylint] Stabilize adding U+061C to bidirectional-unicode (`PLE25…

f726a73

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

second-ed pushed a commit to second-ed/ruff that referenced this pull request Sep 9, 2025

[pylint] Add U+061C to PLE2502 (astral-sh#20106)

5a94fd7

Resolves astral-sh#20058

ntBre pushed a commit that referenced this pull request Sep 10, 2025

[pylint] Stabilize adding U+061C to bidirectional-unicode (`PLE25…

31402ab

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

ntBre pushed a commit that referenced this pull request Sep 10, 2025

[pylint] Stabilize adding U+061C to bidirectional-unicode (`PLE25…

427413d

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

ntBre pushed a commit that referenced this pull request Sep 10, 2025

[pylint] Stabilize adding U+061C to bidirectional-unicode (`PLE25…

4bda9da

…02`) (#20276) Introduced in #20106. Removed gating. Updated tests. No documentation to update.

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	// https://github.com/astral-sh/ruff/pull/19851
	pub(crate) const fn is_maxsplit_without_separator_fix_enabled(settings: &LinterSettings) -> bool {
	settings.preview.is_enabled()
	}

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