Flag private member accesses on calls et al (#2753)

crates/ruff/resources/test/fixtures/flake8_self/SLF001.py

@@ -33,6 +33,8 @@ class Foo(metaclass=BazMeta):
     def get_bar():
         if self.bar._private:  # SLF001
             return None
+        if self.bar()._private:  # SLF001
+            return None
         return self.bar
 
     def public_func(self):
@@ -51,9 +53,11 @@ print(foo.public_thing)
 print(foo.public_func())
 print(foo.__dict__)
 print(foo.__str__())
+print(foo().__class__)
 
 print(foo._private_thing)  # SLF001
 print(foo.__really_private_thing)  # SLF001
 print(foo._private_func())  # SLF001
 print(foo.__really_private_func(1))  # SLF001
 print(foo.bar._private)  # SLF001
+print(foo()._private_thing)  # SLF001

crates/ruff/src/rules/flake8_self/rules/private_member_access.rs

@@ -1,6 +1,8 @@
-use ruff_macros::{define_violation, derive_message_formats};
 use rustpython_parser::ast::{Expr, ExprKind};
 
+use ruff_macros::{define_violation, derive_message_formats};
+
+use crate::ast::helpers::collect_call_path;
 use crate::ast::types::Range;
 use crate::checkers::ast::Checker;
 use crate::registry::Diagnostic;
@@ -25,20 +27,17 @@ const VALID_IDS: [&str; 3] = ["self", "cls", "mcs"];
 pub fn private_member_access(checker: &mut Checker, expr: &Expr) {
     if let ExprKind::Attribute { value, attr, .. } = &expr.node {
         if !attr.ends_with("__") && (attr.starts_with('_') || attr.starts_with("__")) {
-            let id = match &value.node {
-                ExprKind::Name { id, .. } => id,
-                ExprKind::Attribute { attr, .. } => attr,
-                _ => return,
-            };
+            let call_path = collect_call_path(value);
+            if VALID_IDS.iter().any(|id| call_path.as_slice() == [*id]) {
+                return;
+            }
 
-            if !VALID_IDS.contains(&id.as_str()) {
             checker.diagnostics.push(Diagnostic::new(
                 PrivateMemberAccess {
-                        access: format!("{}.{}", id, attr),
+                    access: attr.to_string(),
                 },
                 Range::from_located(expr),
             ));
         }
     }
 }
-}

crates/ruff/src/rules/flake8_self/snapshots/ruff__rules__flake8_self__tests__private-member-access_SLF001.py.snap

@@ -1,10 +1,10 @@
 ---
-source: src/rules/flake8_self/mod.rs
+source: crates/ruff/src/rules/flake8_self/mod.rs
 expression: diagnostics
 ---
 - kind:
     PrivateMemberAccess:
-      access: bar._private
+      access: _private
   location:
     row: 34
     column: 11
@@ -15,57 +15,79 @@ expression: diagnostics
   parent: ~
 - kind:
     PrivateMemberAccess:
-      access: foo._private_thing
+      access: _private
   location:
-    row: 55
+    row: 36
+    column: 11
+  end_location:
+    row: 36
+    column: 30
+  fix: ~
+  parent: ~
+- kind:
+    PrivateMemberAccess:
+      access: _private_thing
+  location:
+    row: 58
     column: 6
   end_location:
-    row: 55
+    row: 58
     column: 24
   fix: ~
   parent: ~
 - kind:
     PrivateMemberAccess:
-      access: foo.__really_private_thing
+      access: __really_private_thing
   location:
-    row: 56
+    row: 59
     column: 6
   end_location:
-    row: 56
+    row: 59
     column: 32
   fix: ~
   parent: ~
 - kind:
     PrivateMemberAccess:
-      access: foo._private_func
+      access: _private_func
   location:
-    row: 57
+    row: 60
     column: 6
   end_location:
-    row: 57
+    row: 60
     column: 23
   fix: ~
   parent: ~
 - kind:
     PrivateMemberAccess:
-      access: foo.__really_private_func
+      access: __really_private_func
   location:
-    row: 58
+    row: 61
     column: 6
   end_location:
-    row: 58
+    row: 61
     column: 31
   fix: ~
   parent: ~
 - kind:
     PrivateMemberAccess:
-      access: bar._private
+      access: _private
   location:
-    row: 59
+    row: 62
     column: 6
   end_location:
-    row: 59
+    row: 62
     column: 22
   fix: ~
   parent: ~
+- kind:
+    PrivateMemberAccess:
+      access: _private_thing
+  location:
+    row: 63
+    column: 6
+  end_location:
+    row: 63
+    column: 26
+  fix: ~
+  parent: ~