Add separate file; tweak docs

crates/ruff_linter/resources/test/fixtures/pylint/too_many_locals.py

@@ -1,4 +1,4 @@
-def func() -> None:  # Ok
+def func() -> None:  # OK
     # 15 is max default
     first = 1
     second = 2
@@ -16,6 +16,7 @@ def func() -> None:  # Ok
     fourteenth = 14
     fifteenth = 15
 
+
 def func() -> None:  # PLR0914
     first = 1
     second = 2

crates/ruff_linter/src/checkers/ast/analyze/deferred_scopes.rs

@@ -1,5 +1,4 @@
 use ruff_diagnostics::Diagnostic;
-use ruff_python_ast::identifier::Identifier;
 use ruff_python_semantic::analyze::visibility;
 use ruff_python_semantic::{Binding, BindingKind, ScopeKind};
 use ruff_text_size::Ranged;
@@ -340,26 +339,7 @@ pub(crate) fn deferred_scopes(checker: &mut Checker) {
             }
 
             if checker.enabled(Rule::TooManyLocals) {
-                // PLR0914
-                let num_locals = scope
-                    .binding_ids()
-                    .filter(|&id| {
-                        let binding = checker.semantic.binding(id);
-                        matches!(binding.kind, BindingKind::Assignment)
-                    })
-                    .count();
-
-                if num_locals > checker.settings.pylint.max_locals {
-                    if let ScopeKind::Function(func) = scope.kind {
-                        diagnostics.push(Diagnostic::new(
-                            pylint::rules::TooManyLocals {
-                                current_amount: num_locals,
-                                max_amount: checker.settings.pylint.max_locals,
-                            },
-                            func.identifier(),
-                        ));
-                    };
-                }
+                pylint::rules::too_many_locals(checker, scope, &mut diagnostics);
             }
         }
     }

crates/ruff_linter/src/rules/pylint/rules/too_many_locals.rs

@@ -1,10 +1,14 @@
-use ruff_diagnostics::Violation;
+use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
+use ruff_python_ast::identifier::Identifier;
+use ruff_python_semantic::{Scope, ScopeKind};
+
+use crate::checkers::ast::Checker;
 
 /// ## What it does
-/// Checks for functions/methods that include too many local variables.
+/// Checks for functions that include too many local variables.
 ///
-/// By default, this rule allows up to fifteen arguments, as configured by the
+/// By default, this rule allows up to fifteen locals, as configured by the
 /// [`pylint.max-locals`] option.
 ///
 /// ## Why is this bad?
@@ -17,8 +21,8 @@ use ruff_macros::{derive_message_formats, violation};
 /// - `pylint.max-locals`
 #[violation]
 pub struct TooManyLocals {
-    pub(crate) current_amount: usize,
-    pub(crate) max_amount: usize,
+    current_amount: usize,
+    max_amount: usize,
 }
 
 impl Violation for TooManyLocals {
@@ -31,3 +35,25 @@ impl Violation for TooManyLocals {
         format!("Too many local variables: ({current_amount}/{max_amount})")
     }
 }
+
+/// PLR0914
+pub(crate) fn too_many_locals(checker: &Checker, scope: &Scope, diagnostics: &mut Vec<Diagnostic>) {
+    let num_locals = scope
+        .binding_ids()
+        .filter(|id| {
+            let binding = checker.semantic().binding(*id);
+            binding.kind.is_assignment()
+        })
+        .count();
+    if num_locals > checker.settings.pylint.max_locals {
+        if let ScopeKind::Function(func) = scope.kind {
+            diagnostics.push(Diagnostic::new(
+                TooManyLocals {
+                    current_amount: num_locals,
+                    max_amount: checker.settings.pylint.max_locals,
+                },
+                func.identifier(),
+            ));
+        };
+    }
+}

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__too_many_locals.snap

@@ -1,14 +1,12 @@
 ---
 source: crates/ruff_linter/src/rules/pylint/mod.rs
 ---
-too_many_locals.py:19:5: PLR0914 Too many local variables: (16/15)
+too_many_locals.py:20:5: PLR0914 Too many local variables: (16/15)
    |
-17 |     fifteenth = 15
-18 | 
-19 | def func() -> None:  # PLR0914
+20 | def func() -> None:  # PLR0914
    |     ^^^^ PLR0914
-20 |     first = 1
-21 |     second = 2
+21 |     first = 1
+22 |     second = 2
    |