Auto merge of #84039 - jyn514:uplift-atomic-ordering, r=wesleywiser

[rust.git] / clippy_lints / src / else_if_without_else.rs

diff --git a/clippy_lints/src/else_if_without_else.rs b/clippy_lints/src/else_if_without_else.rs
index ff8345290b29610b8d2078eeec513310f9123c63..b64246515f34f79fab343e868120c52060605f1e 100644 (file)
--- a/clippy_lints/src/else_if_without_else.rs
+++ b/clippy_lints/src/else_if_without_else.rs
@@ -1,75 +1,66 @@
-// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
+//! Lint on if expressions with an else if, but without a final else branch.
 
-//! lint on if expressions with an else if, but without a final else branch
+use clippy_utils::diagnostics::span_lint_and_help;
+use rustc_ast::ast::{Expr, ExprKind};
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
 
-use rustc::lint::{in_external_macro, EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
-
-use crate::utils::span_help_and_lint;
-
-/// **What it does:** Checks for usage of if expressions with an `else if` branch,
-/// but without a final `else` branch.
-///
-/// **Why is this bad?** Some coding guidelines require this (e.g. MISRA-C:2004 Rule 14.10).
-///
-/// **Known problems:** None.
-///
-/// **Example:**
-/// ```rust
-/// if x.is_positive() {
-///     a();
-/// } else if x.is_negative() {
-///     b();
-/// }
-/// ```
-///
-/// Could be written:
-///
-/// ```rust
-/// if x.is_positive() {
-///     a();
-/// } else if x.is_negative() {
-///     b();
-/// } else {
-///     // we don't care about zero
-/// }
-/// ```
 declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for usage of if expressions with an `else if` branch,
+    /// but without a final `else` branch.
+    ///
+    /// ### Why is this bad?
+    /// Some coding guidelines require this (e.g., MISRA-C:2004 Rule 14.10).
+    ///
+    /// ### Example
+    /// ```rust
+    /// # fn a() {}
+    /// # fn b() {}
+    /// # let x: i32 = 1;
+    /// if x.is_positive() {
+    ///     a();
+    /// } else if x.is_negative() {
+    ///     b();
+    /// }
+    /// ```
+    ///
+    /// Could be written:
+    ///
+    /// ```rust
+    /// # fn a() {}
+    /// # fn b() {}
+    /// # let x: i32 = 1;
+    /// if x.is_positive() {
+    ///     a();
+    /// } else if x.is_negative() {
+    ///     b();
+    /// } else {
+    ///     // We don't care about zero.
+    /// }
+    /// ```
     pub ELSE_IF_WITHOUT_ELSE,
     restriction,
-    "if expression with an `else if`, but without a final `else` branch"
+    "`if` expression with an `else if`, but without a final `else` branch"
 }
 
-#[derive(Copy, Clone)]
-pub struct ElseIfWithoutElse;
-
-impl LintPass for ElseIfWithoutElse {
-    fn get_lints(&self) -> LintArray {
-        lint_array!(ELSE_IF_WITHOUT_ELSE)
-    }
-}
+declare_lint_pass!(ElseIfWithoutElse => [ELSE_IF_WITHOUT_ELSE]);
 
 impl EarlyLintPass for ElseIfWithoutElse {
     fn check_expr(&mut self, cx: &EarlyContext<'_>, mut item: &Expr) {
-        if in_external_macro(cx.sess(), item.span) {
+        if in_external_macro(cx.sess, item.span) {
             return;
         }
 
-        while let ExprKind::If(_, _, Some(ref els)) = item.node {
-            if let ExprKind::If(_, _, None) = els.node {
-                span_help_and_lint(
+        while let ExprKind::If(_, _, Some(ref els)) = item.kind {
+            if let ExprKind::If(_, _, None) = els.kind {
+                span_lint_and_help(
                     cx,
                     ELSE_IF_WITHOUT_ELSE,
                     els.span,
-                    "if expression with an `else if`, but without a final `else`",
+                    "`if` expression with an `else if`, but without a final `else`",
+                    None,
                     "add an `else` block here",
                 );
             }