Remove some diagnostics.extend calls (#5483)

## Summary

It's more efficient (and more idiomatic for us) to pass in the `Checker`
directly.

crates/ruff/src/checkers/ast/mod.rs

@@ -359,11 +359,7 @@ where
                 ..
             }) => {
                 if self.enabled(Rule::DjangoNonLeadingReceiverDecorator) {
-                    self.diagnostics
+                    flake8_django::rules::non_leading_receiver_decorator(self, decorator_list);
-                        .extend(flake8_django::rules::non_leading_receiver_decorator(
-                            decorator_list,
-                            |expr| self.semantic.resolve_call_path(expr),
-                        ));
                 }
                 if self.enabled(Rule::AmbiguousFunctionName) {
                     if let Some(diagnostic) =
@@ -505,8 +501,7 @@ where
                     }
                 }
                 if self.enabled(Rule::HardcodedPasswordDefault) {
-                    self.diagnostics
+                    flake8_bandit::rules::hardcoded_password_default(self, args);
-                        .extend(flake8_bandit::rules::hardcoded_password_default(args));
                 }
                 if self.enabled(Rule::PropertyWithParameters) {
                     pylint::rules::property_with_parameters(self, stmt, decorator_list, args);
@@ -1573,9 +1568,7 @@ where
                     pyupgrade::rules::os_error_alias_handlers(self, handlers);
                 }
                 if self.enabled(Rule::PytestAssertInExcept) {
-                    self.diagnostics.extend(
+                    flake8_pytest_style::rules::assert_in_exception_handler(self, handlers);
-                        flake8_pytest_style::rules::assert_in_exception_handler(handlers),
-                    );
                 }
                 if self.enabled(Rule::SuppressibleException) {
                     flake8_simplify::rules::suppressible_exception(
@@ -1616,11 +1609,7 @@ where
                     flake8_bugbear::rules::assignment_to_os_environ(self, targets);
                 }
                 if self.enabled(Rule::HardcodedPasswordString) {
-                    if let Some(diagnostic) =
+                    flake8_bandit::rules::assign_hardcoded_password_string(self, value, targets);
-                        flake8_bandit::rules::assign_hardcoded_password_string(value, targets)
-                    {
-                        self.diagnostics.push(diagnostic);
-                    }
                 }
                 if self.enabled(Rule::GlobalStatement) {
                     for target in targets.iter() {
@@ -2615,8 +2604,7 @@ where
                     flake8_bandit::rules::jinja2_autoescape_false(self, func, args, keywords);
                 }
                 if self.enabled(Rule::HardcodedPasswordFuncArg) {
-                    self.diagnostics
+                    flake8_bandit::rules::hardcoded_password_func_arg(self, keywords);
-                        .extend(flake8_bandit::rules::hardcoded_password_func_arg(keywords));
                 }
                 if self.enabled(Rule::HardcodedSQLExpression) {
                     flake8_bandit::rules::hardcoded_sql_expression(self, expr);
@@ -2871,16 +2859,13 @@ where
                     &self.settings.flake8_gettext.functions_names,
                 ) {
                     if self.enabled(Rule::FStringInGetTextFuncCall) {
-                        self.diagnostics
+                        flake8_gettext::rules::f_string_in_gettext_func_call(self, args);
-                            .extend(flake8_gettext::rules::f_string_in_gettext_func_call(args));
                     }
                     if self.enabled(Rule::FormatInGetTextFuncCall) {
-                        self.diagnostics
+                        flake8_gettext::rules::format_in_gettext_func_call(self, args);
-                            .extend(flake8_gettext::rules::format_in_gettext_func_call(args));
                     }
                     if self.enabled(Rule::PrintfInGetTextFuncCall) {
-                        self.diagnostics
+                        flake8_gettext::rules::printf_in_gettext_func_call(self, args);
-                            .extend(flake8_gettext::rules::printf_in_gettext_func_call(args));
                     }
                 }
                 if self.enabled(Rule::UncapitalizedEnvironmentVariables) {
@@ -3221,11 +3206,10 @@ where
                     flake8_2020::rules::compare(self, left, ops, comparators);
                 }
                 if self.enabled(Rule::HardcodedPasswordString) {
-                    self.diagnostics.extend(
                     flake8_bandit::rules::compare_to_hardcoded_password_string(
+                        self,
                         left,
                         comparators,
-                        ),
                     );
                 }
                 if self.enabled(Rule::ComparisonWithItself) {

crates/ruff/src/rules/flake8_bandit/rules/hardcoded_password_default.rs

@@ -1,5 +1,6 @@
 use rustpython_parser::ast::{Arg, ArgWithDefault, Arguments, Expr, Ranged};
 
+use crate::checkers::ast::Checker;
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 
@@ -36,9 +37,7 @@ fn check_password_kwarg(arg: &Arg, default: &Expr) -> Option<Diagnostic> {
 }
 
 /// S107
-pub(crate) fn hardcoded_password_default(arguments: &Arguments) -> Vec<Diagnostic> {
+pub(crate) fn hardcoded_password_default(checker: &mut Checker, arguments: &Arguments) {
-    let mut diagnostics: Vec<Diagnostic> = Vec::new();
-
     for ArgWithDefault {
         def,
         default,
@@ -53,9 +52,7 @@ pub(crate) fn hardcoded_password_default(arguments: &Arguments) -> Vec<Diagnosti
             continue;
         };
         if let Some(diagnostic) = check_password_kwarg(def, default) {
-            diagnostics.push(diagnostic);
+            checker.diagnostics.push(diagnostic);
         }
     }
-
-    diagnostics
 }

crates/ruff/src/rules/flake8_bandit/rules/hardcoded_password_func_arg.rs

@@ -1,5 +1,6 @@
 use rustpython_parser::ast::{Keyword, Ranged};
 
+use crate::checkers::ast::Checker;
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 
@@ -22,10 +23,10 @@ impl Violation for HardcodedPasswordFuncArg {
 }
 
 /// S106
-pub(crate) fn hardcoded_password_func_arg(keywords: &[Keyword]) -> Vec<Diagnostic> {
+pub(crate) fn hardcoded_password_func_arg(checker: &mut Checker, keywords: &[Keyword]) {
-    keywords
+    checker
-        .iter()
+        .diagnostics
-        .filter_map(|keyword| {
+        .extend(keywords.iter().filter_map(|keyword| {
             string_literal(&keyword.value).filter(|string| !string.is_empty())?;
             let arg = keyword.arg.as_ref()?;
             if !matches_password_name(arg) {
@@ -37,6 +38,5 @@ pub(crate) fn hardcoded_password_func_arg(keywords: &[Keyword]) -> Vec<Diagnosti
                 },
                 keyword.range(),
             ))
-        })
+        }));
-        .collect()
 }

crates/ruff/src/rules/flake8_bandit/rules/hardcoded_password_string.rs

@@ -3,6 +3,8 @@ use rustpython_parser::ast::{self, Constant, Expr, Ranged};
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 
+use crate::checkers::ast::Checker;
+
 use super::super::helpers::{matches_password_name, string_literal};
 
 #[violation]
@@ -47,12 +49,13 @@ fn password_target(target: &Expr) -> Option<&str> {
 
 /// S105
 pub(crate) fn compare_to_hardcoded_password_string(
+    checker: &mut Checker,
     left: &Expr,
     comparators: &[Expr],
-) -> Vec<Diagnostic> {
+) {
-    comparators
+    checker
-        .iter()
+        .diagnostics
-        .filter_map(|comp| {
+        .extend(comparators.iter().filter_map(|comp| {
             string_literal(comp).filter(|string| !string.is_empty())?;
             let Some(name) = password_target(left) else {
                 return None;
@@ -63,29 +66,29 @@ pub(crate) fn compare_to_hardcoded_password_string(
                 },
                 comp.range(),
             ))
-        })
+        }));
-        .collect()
 }
 
 /// S105
 pub(crate) fn assign_hardcoded_password_string(
+    checker: &mut Checker,
     value: &Expr,
     targets: &[Expr],
-) -> Option<Diagnostic> {
+) {
     if string_literal(value)
         .filter(|string| !string.is_empty())
         .is_some()
     {
         for target in targets {
             if let Some(name) = password_target(target) {
-                return Some(Diagnostic::new(
+                checker.diagnostics.push(Diagnostic::new(
                     HardcodedPasswordString {
                         name: name.to_string(),
                     },
                     value.range(),
                 ));
+                return;
             }
         }
     }
-    None
 }

crates/ruff/src/rules/flake8_django/rules/non_leading_receiver_decorator.rs

@@ -1,8 +1,9 @@
-use rustpython_parser::ast::{self, Decorator, Expr, Ranged};
+use rustpython_parser::ast::{Decorator, Ranged};
 
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
-use ruff_python_ast::call_path::CallPath;
+
+use crate::checkers::ast::Checker;
 
 /// ## What it does
 /// Checks that Django's `@receiver` decorator is listed first, prior to
@@ -48,25 +49,19 @@ impl Violation for DjangoNonLeadingReceiverDecorator {
 }
 
 /// DJ013
-pub(crate) fn non_leading_receiver_decorator<'a, F>(
+pub(crate) fn non_leading_receiver_decorator(checker: &mut Checker, decorator_list: &[Decorator]) {
-    decorator_list: &'a [Decorator],
-    resolve_call_path: F,
-) -> Vec<Diagnostic>
-where
-    F: Fn(&'a Expr) -> Option<CallPath<'a>>,
-{
-    let mut diagnostics = vec![];
     let mut seen_receiver = false;
     for (i, decorator) in decorator_list.iter().enumerate() {
-        let is_receiver = match &decorator.expression {
+        let is_receiver = decorator.expression.as_call_expr().map_or(false, |call| {
-            Expr::Call(ast::ExprCall { func, .. }) => resolve_call_path(func)
+            checker
+                .semantic()
+                .resolve_call_path(&call.func)
                 .map_or(false, |call_path| {
                     matches!(call_path.as_slice(), ["django", "dispatch", "receiver"])
-                }),
+                })
-            _ => false,
+        });
-        };
         if i > 0 && is_receiver && !seen_receiver {
-            diagnostics.push(Diagnostic::new(
+            checker.diagnostics.push(Diagnostic::new(
                 DjangoNonLeadingReceiverDecorator,
                 decorator.range(),
             ));
@@ -77,5 +72,4 @@ where
             seen_receiver = true;
         }
     }
-    diagnostics
 }

crates/ruff/src/rules/flake8_gettext/rules/f_string_in_gettext_func_call.rs

@@ -3,6 +3,8 @@ use rustpython_parser::ast::{Expr, Ranged};
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 
+use crate::checkers::ast::Checker;
+
 #[violation]
 pub struct FStringInGetTextFuncCall;
 
@@ -14,11 +16,12 @@ impl Violation for FStringInGetTextFuncCall {
 }
 
 /// INT001
-pub(crate) fn f_string_in_gettext_func_call(args: &[Expr]) -> Option<Diagnostic> {
+pub(crate) fn f_string_in_gettext_func_call(checker: &mut Checker, args: &[Expr]) {
     if let Some(first) = args.first() {
         if first.is_joined_str_expr() {
-            return Some(Diagnostic::new(FStringInGetTextFuncCall {}, first.range()));
+            checker
+                .diagnostics
+                .push(Diagnostic::new(FStringInGetTextFuncCall {}, first.range()));
         }
     }
-    None
 }

crates/ruff/src/rules/flake8_gettext/rules/format_in_gettext_func_call.rs

@@ -3,6 +3,8 @@ use rustpython_parser::ast::{self, Expr, Ranged};
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 
+use crate::checkers::ast::Checker;
+
 #[violation]
 pub struct FormatInGetTextFuncCall;
 
@@ -14,15 +16,16 @@ impl Violation for FormatInGetTextFuncCall {
 }
 
 /// INT002
-pub(crate) fn format_in_gettext_func_call(args: &[Expr]) -> Option<Diagnostic> {
+pub(crate) fn format_in_gettext_func_call(checker: &mut Checker, args: &[Expr]) {
     if let Some(first) = args.first() {
         if let Expr::Call(ast::ExprCall { func, .. }) = &first {
             if let Expr::Attribute(ast::ExprAttribute { attr, .. }) = func.as_ref() {
                 if attr == "format" {
-                    return Some(Diagnostic::new(FormatInGetTextFuncCall {}, first.range()));
+                    checker
+                        .diagnostics
+                        .push(Diagnostic::new(FormatInGetTextFuncCall {}, first.range()));
                 }
             }
         }
     }
-    None
 }

crates/ruff/src/rules/flake8_gettext/rules/printf_in_gettext_func_call.rs

@@ -1,5 +1,6 @@
 use rustpython_parser::ast::{self, Constant, Expr, Operator, Ranged};
 
+use crate::checkers::ast::Checker;
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 
@@ -14,7 +15,7 @@ impl Violation for PrintfInGetTextFuncCall {
 }
 
 /// INT003
-pub(crate) fn printf_in_gettext_func_call(args: &[Expr]) -> Option<Diagnostic> {
+pub(crate) fn printf_in_gettext_func_call(checker: &mut Checker, args: &[Expr]) {
     if let Some(first) = args.first() {
         if let Expr::BinOp(ast::ExprBinOp {
             op: Operator::Mod { .. },
@@ -27,9 +28,10 @@ pub(crate) fn printf_in_gettext_func_call(args: &[Expr]) -> Option<Diagnostic> {
                 ..
             }) = left.as_ref()
             {
-                return Some(Diagnostic::new(PrintfInGetTextFuncCall {}, first.range()));
+                checker
+                    .diagnostics
+                    .push(Diagnostic::new(PrintfInGetTextFuncCall {}, first.range()));
             }
         }
     }
-    None
 }

crates/ruff/src/rules/flake8_pytest_style/rules/assertion.rs

@@ -226,10 +226,10 @@ pub(crate) fn assert_falsy(checker: &mut Checker, stmt: &Stmt, test: &Expr) {
 }
 
 /// PT017
-pub(crate) fn assert_in_exception_handler(handlers: &[ExceptHandler]) -> Vec<Diagnostic> {
+pub(crate) fn assert_in_exception_handler(checker: &mut Checker, handlers: &[ExceptHandler]) {
-    handlers
+    checker
-        .iter()
+        .diagnostics
-        .flat_map(|handler| match handler {
+        .extend(handlers.iter().flat_map(|handler| match handler {
             ExceptHandler::ExceptHandler(ast::ExceptHandlerExceptHandler {
                 name, body, ..
             }) => {
@@ -239,8 +239,7 @@ pub(crate) fn assert_in_exception_handler(handlers: &[ExceptHandler]) -> Vec<Dia
                     Vec::new()
                 }
             }
-        })
+        }));
-        .collect()
 }
 
 #[derive(Copy, Clone)]

crates/ruff/src/rules/flake8_return/visitor.rs

@@ -5,27 +5,27 @@ use ruff_python_ast::visitor;
 use ruff_python_ast::visitor::Visitor;
 
 #[derive(Default)]
-pub(crate) struct Stack<'a> {
+pub(super) struct Stack<'a> {
     /// The `return` statements in the current function.
-    pub(crate) returns: Vec<&'a ast::StmtReturn>,
+    pub(super) returns: Vec<&'a ast::StmtReturn>,
     /// The `else` statements in the current function.
-    pub(crate) elses: Vec<&'a ast::StmtIf>,
+    pub(super) elses: Vec<&'a ast::StmtIf>,
     /// The `elif` statements in the current function.
-    pub(crate) elifs: Vec<&'a ast::StmtIf>,
+    pub(super) elifs: Vec<&'a ast::StmtIf>,
     /// The non-local variables in the current function.
-    pub(crate) non_locals: FxHashSet<&'a str>,
+    pub(super) non_locals: FxHashSet<&'a str>,
     /// Whether the current function is a generator.
-    pub(crate) is_generator: bool,
+    pub(super) is_generator: bool,
     /// The `assignment`-to-`return` statement pairs in the current function.
     /// TODO(charlie): Remove the extra [`Stmt`] here, which is necessary to support statement
     /// removal for the `return` statement.
-    pub(crate) assignment_return: Vec<(&'a ast::StmtAssign, &'a ast::StmtReturn, &'a Stmt)>,
+    pub(super) assignment_return: Vec<(&'a ast::StmtAssign, &'a ast::StmtReturn, &'a Stmt)>,
 }
 
 #[derive(Default)]
-pub(crate) struct ReturnVisitor<'a> {
+pub(super) struct ReturnVisitor<'a> {
     /// The current stack of nodes.
-    pub(crate) stack: Stack<'a>,
+    pub(super) stack: Stack<'a>,
     /// The preceding sibling of the current node.
     sibling: Option<&'a Stmt>,
     /// The parent nodes of the current node.