Escaped single-quote docsting within single-quote docstring

crates/ruff_linter/resources/test/fixtures/pydocstyle/D301.py

@@ -37,31 +37,59 @@ def shouldnt_add_raw_here2():
     u"Sum\\mary."
 
 
-def shouldnt_add_raw_for_docstring_contains_docstring():
+def shouldnt_add_raw_for_double_quote_docstring_contains_docstring():
     """
-    This docstring contains another docstring.
+    This docstring contains another double-quote docstring.
 
         def foo():
             \"\"\"Foo.\"\"\"
     """
 
 
-def shouldnt_add_raw_for_docstring_contains_docstring2():
+def shouldnt_add_raw_for_double_quote_docstring_contains_docstring2():
     """
-    This docstring contains another docstring.
+    This docstring contains another double-quote docstring.
 
         def bar():
             \"""Bar.\"""
     """
 
 
-def shouldnt_add_raw_for_docstring_contains_escaped_triple_quotes():
+def shouldnt_add_raw_for_single_quote_docstring_contains_docstring():
+    '''
+    This docstring contains another single-quote docstring.
+
+        def foo():
+            \'\'\'Foo.\'\'\'
+    '''
+
+
+def shouldnt_add_raw_for_single_quote_docstring_contains_docstring2():
+    '''
+    This docstring contains another single-quote docstring.
+
+        def bar():
+            \'''Bar.\'''
+    '''
+
+def shouldnt_add_raw_for_docstring_contains_escaped_double_triple_quotes():
     """
     Escaped triple quote \""" or \"\"\".
     """
 
+def shouldnt_add_raw_for_docstring_contains_escaped_single_triple_quotes():
+    '''
+    Escaped triple quote \''' or \'\'\'.
+    '''
+
 
-def should_add_raw_for_single_quote_escape():
+def should_add_raw_for_single_double_quote_escape():
     """
     This is single quote escape \".
-    """
+    """
+
+
+def should_add_raw_for_single_single_quote_escape():
+    '''
+    This is single quote escape \'.
+    '''

crates/ruff_linter/src/rules/pydocstyle/rules/backslashes.rs

@@ -70,24 +70,28 @@ pub(crate) fn backslashes(checker: &mut Checker, docstring: &Docstring) {
     let body = docstring.body();
     let bytes = body.as_bytes();
     let mut backslash_index = 0;
-    let escaped_docstring_backslashes_pattern = b"\"\\\"\\\"";
+    let double_quote_docstring_backslashes_pattern = b"\"\\\"\\\"";
+    let single_quote_docstring_backslashes_pattern = b"\'\\\'\\\'";
     if memchr_iter(b'\\', bytes).any(|position| {
         let escaped_char = bytes.get(position.saturating_add(1));
         // Allow escaped docstring.
-        if matches!(escaped_char, Some(b'"')) {
-            // If the next chars is equal to `"""`, it is a escaped docstring pattern.
+        if matches!(escaped_char, Some(b'"' | b'\'')) {
+            // If the next three characters are equal to """, it indicates an escaped docstring pattern.
             let escaped_triple_quotes =
                 &bytes[position.saturating_add(1)..position.saturating_add(4)];
-            if escaped_triple_quotes == b"\"\"\"" {
+            if escaped_triple_quotes == b"\"\"\"" || escaped_triple_quotes == b"\'\'\'" {
                 return false;
             }
+
             // For the `"\"\"` pattern, each iteration advances by 2 characters.
             // For example, the sequence progresses from `"\"\"` to `"\"` and then to `"`.
             // Therefore, we utilize an index to keep track of the remaining characters.
             let escaped_quotes_backslashes = &bytes
                 [position.saturating_add(1)..position.saturating_add(6 - backslash_index * 2)];
             if escaped_quotes_backslashes
-                == &escaped_docstring_backslashes_pattern[backslash_index * 2..]
+                == &double_quote_docstring_backslashes_pattern[backslash_index * 2..]
+                || escaped_quotes_backslashes
+                    == &single_quote_docstring_backslashes_pattern[backslash_index * 2..]
             {
                 backslash_index += 1;
                 // Reset to avoid overflow.

crates/ruff_linter/src/rules/pydocstyle/snapshots/ruff_linter__rules__pydocstyle__tests__D301_D301.py.snap

@@ -25,22 +25,43 @@ D301.py:37:5: D301 Use `r"""` if any backslashes in a docstring
    |
    = help: Add `r` prefix
 
-D301.py:65:5: D301 [*] Use `r"""` if any backslashes in a docstring
+D301.py:87:5: D301 [*] Use `r"""` if any backslashes in a docstring
    |
-64 |   def should_add_raw_for_single_quote_escape():
-65 |       """
+86 |   def should_add_raw_for_single_double_quote_escape():
+87 |       """
    |  _____^
-66 | |     This is single quote escape \".
-67 | |     """
+88 | |     This is single quote escape \".
+89 | |     """
    | |_______^ D301
    |
    = help: Add `r` prefix
 
 ℹ Unsafe fix
-62 62 | 
-63 63 | 
-64 64 | def should_add_raw_for_single_quote_escape():
-65    |-    """
-   65 |+    r"""
-66 66 |     This is single quote escape \".
-67 67 |     """
+84 84 | 
+85 85 | 
+86 86 | def should_add_raw_for_single_double_quote_escape():
+87    |-    """
+   87 |+    r"""
+88 88 |     This is single quote escape \".
+89 89 |     """
+90 90 | 
+
+D301.py:93:5: D301 [*] Use `r"""` if any backslashes in a docstring
+   |
+92 |   def should_add_raw_for_single_single_quote_escape():
+93 |       '''
+   |  _____^
+94 | |     This is single quote escape \'.
+95 | |     '''
+   | |_______^ D301
+   |
+   = help: Add `r` prefix
+
+ℹ Unsafe fix
+90 90 | 
+91 91 | 
+92 92 | def should_add_raw_for_single_single_quote_escape():
+93    |-    '''
+   93 |+    r'''
+94 94 |     This is single quote escape \'.
+95 95 |     '''