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Fix needless_bool suggestion with if-else-if-else

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Closes #4334
This commit is contained in:
Philipp Hansch 2019-08-04 22:08:28 +02:00
parent a813c057d5
commit 4cfb0966a1
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GPG key ID: 82AA61CAA11397E6
3 changed files with 26 additions and 23 deletions
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14
clippy_lints/src/needless_bool.rs
View file

@ -118,13 +118,15 @@ fn parent_node_is_if_expr<'a, 'b>(expr: &Expr, cx: &LateContext<'a, 'b>) -> bool
let parent_id = cx.tcx.hir().get_parent_node(expr.hir_id);
let parent_node = cx.tcx.hir().get(parent_id);
if let rustc::hir::Node::Expr(e) = parent_node {
if higher::if_block(&e).is_some() {
return true;
}
match parent_node {
rustc::hir::Node::Expr(e) => {
higher::if_block(&e).is_some()
},
rustc::hir::Node::Arm(e) => {
higher::if_block(&e.body).is_some()
},
_ => false
}
false
}
declare_lint_pass!(BoolComparison => [BOOL_COMPARISON]);

1
tests/ui/needless_bool.rs
View file

@ -1,4 +1,5 @@
#![warn(clippy::needless_bool)]
#![allow(unused, dead_code, clippy::no_effect)]
use std::cell::Cell;

34
tests/ui/needless_bool.stderr
View file

@ -1,5 +1,5 @@
error: this if-then-else expression will always return true
--> $DIR/needless_bool.rs:31:5
--> $DIR/needless_bool.rs:32:5
|
LL | / if x {
LL | | true
@ -11,7 +11,7 @@ LL | | };
= note: `-D clippy::needless-bool` implied by `-D warnings`
error: this if-then-else expression will always return false
--> $DIR/needless_bool.rs:36:5
--> $DIR/needless_bool.rs:37:5
|
LL | / if x {
LL | | false
@ -21,7 +21,7 @@ LL | | };
| |_____^
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:41:5
--> $DIR/needless_bool.rs:42:5
|
LL | / if x {
LL | | true
@ -31,7 +31,7 @@ LL | | };
| |_____^ help: you can reduce it to: `x`
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:46:5
--> $DIR/needless_bool.rs:47:5
|
LL | / if x {
LL | | false
@ -41,7 +41,7 @@ LL | | };
| |_____^ help: you can reduce it to: `!x`
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:51:5
--> $DIR/needless_bool.rs:52:5
|
LL | / if x && y {
LL | | false
@ -51,7 +51,7 @@ LL | | };
| |_____^ help: you can reduce it to: `!(x && y)`
error: this if-then-else expression will always return true
--> $DIR/needless_bool.rs:74:5
--> $DIR/needless_bool.rs:75:5
|
LL | / if x {
LL | | return true;
@ -61,7 +61,7 @@ LL | | };
| |_____^
error: this if-then-else expression will always return false
--> $DIR/needless_bool.rs:83:5
--> $DIR/needless_bool.rs:84:5
|
LL | / if x {
LL | | return false;
@ -71,7 +71,7 @@ LL | | };
| |_____^
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:92:5
--> $DIR/needless_bool.rs:93:5
|
LL | / if x {
LL | | return true;
@ -81,7 +81,7 @@ LL | | };
| |_____^ help: you can reduce it to: `return x`
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:101:5
--> $DIR/needless_bool.rs:102:5
|
LL | / if x && y {
LL | | return true;
@ -91,7 +91,7 @@ LL | | };
| |_____^ help: you can reduce it to: `return x && y`
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:110:5
--> $DIR/needless_bool.rs:111:5
|
LL | / if x {
LL | | return false;
@ -101,7 +101,7 @@ LL | | };
| |_____^ help: you can reduce it to: `return !x`
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:119:5
--> $DIR/needless_bool.rs:120:5
|
LL | / if x && y {
LL | | return false;
@ -111,7 +111,7 @@ LL | | };
| |_____^ help: you can reduce it to: `return !(x && y)`
error: equality checks against true are unnecessary
--> $DIR/needless_bool.rs:127:8
--> $DIR/needless_bool.rs:128:8
|
LL | if x == true {};
| ^^^^^^^^^ help: try simplifying it as shown: `x`
@ -119,25 +119,25 @@ LL | if x == true {};
= note: `-D clippy::bool-comparison` implied by `-D warnings`
error: equality checks against false can be replaced by a negation
--> $DIR/needless_bool.rs:131:8
--> $DIR/needless_bool.rs:132:8
|
LL | if x == false {};
| ^^^^^^^^^^ help: try simplifying it as shown: `!x`
error: equality checks against true are unnecessary
--> $DIR/needless_bool.rs:141:8
--> $DIR/needless_bool.rs:142:8
|
LL | if x == true {};
| ^^^^^^^^^ help: try simplifying it as shown: `x`
error: equality checks against false can be replaced by a negation
--> $DIR/needless_bool.rs:142:8
--> $DIR/needless_bool.rs:143:8
|
LL | if x == false {};
| ^^^^^^^^^^ help: try simplifying it as shown: `!x`
error: this if-then-else expression returns a bool literal
--> $DIR/needless_bool.rs:151:12
--> $DIR/needless_bool.rs:152:12
|
LL | } else if returns_bool() {
| ____________^
@ -145,7 +145,7 @@ LL | | false
LL | | } else {
LL | | true
LL | | };
| |_____^ help: you can reduce it to: `!returns_bool()`
| |_____^ help: you can reduce it to: `{ !returns_bool() }`
error: aborting due to 16 previous errors