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Make if_then_panic handle situation of BinOpKind::And || BinOpKind::Or #7741

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Merged
merged 2 commits into from
Oct 1, 2021
Merged

Make if_then_panic handle situation of BinOpKind::And || BinOpKind::Or #7741

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4babfae
fix issue #7731
surechen Sep 30, 2021
41e2c68
use sugg::Sugg::maybe_par
surechen Oct 1, 2021
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14 changes: 8 additions & 6 deletions clippy_lints/src/if_then_panic.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::higher::PanicExpn;
use clippy_utils::is_expn_of;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::{is_expn_of, sugg};
use rustc_errors::Applicability;
use rustc_hir::{Block, Expr, ExprKind, StmtKind, UnOp};
use rustc_lint::{LateContext, LateLintPass};
Expand Down Expand Up @@ -74,12 +74,14 @@ impl LateLintPass<'_> for IfThenPanic {
};
let mut applicability = Applicability::MachineApplicable;
let sugg = snippet_with_applicability(cx, span, "..", &mut applicability);

let cond_sugg =
if let ExprKind::DropTemps(Expr{kind: ExprKind::Unary(UnOp::Not, not_expr), ..}) = cond.kind {
snippet_with_applicability(cx, not_expr.span, "..", &mut applicability).to_string()
let cond_sugg = if let ExprKind::DropTemps(e, ..) = cond.kind {
if let Expr{kind: ExprKind::Unary(UnOp::Not, not_expr), ..} = e {
sugg::Sugg::hir_with_applicability(cx, not_expr, "..", &mut applicability).maybe_par().to_string()
} else {
format!("!{}", sugg::Sugg::hir_with_applicability(cx, e, "..", &mut applicability).maybe_par().to_string())
}
} else {
format!("!{}", snippet_with_applicability(cx, cond.span, "..", &mut applicability))
format!("!{}", sugg::Sugg::hir_with_applicability(cx, cond, "..", &mut applicability).maybe_par().to_string())
Comment on lines +77 to +84
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cond and e should have the same Span , so the two format! calls are pretty much equivalent. I think you only have to change the else case and not the ExprKind::Unary case.

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@surechen surechen Oct 1, 2021 •
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cond and e should have the same Span , so the two format! calls are pretty much equivalent. I think you only have to change the else case and not the ExprKind::Unary case.

Hi, I thought the same at the beginning, but if I only modify the else block:

let cond_sugg = if let ExprKind::DropTemps(Expr{kind: ExprKind::Unary(UnOp::Not, not_expr), ..}, ..) = cond.kind {
     sugg::Sugg::hir_with_applicability(cx, not_expr, "..", &mut applicability).maybe_par().to_string()
} else {
     format!("!{}", sugg::Sugg::hir_with_applicability(cx, cond, "..", &mut applicability).maybe_par().to_string())
};

result will be like this：

error: only a `panic!` in `if`-then statement
  --> $DIR/if_then_panic.rs:45:5
   |
LL | /     if a.is_empty() && !b.is_empty() {
LL | |         panic!("panic3");
LL | |     }
   | |_____^ help: try: `assert!(!a.is_empty() && !b.is_empty(), "panic3");`

So I think "a.is_empty() && !b.is_empty()" is ExprKind::DropTemps{Expr{kind: ExprKind::Binary(BinOpKind::And, left, right), ..}} here.

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Hm, that's weird. I also just tested it locally. In that case, let's merge it as it is.

};

span_lint_and_sugg(
Expand Down
6 changes: 6 additions & 0 deletions tests/ui/if_then_panic.fixed
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Original file line number Diff line number Diff line change
Expand Up @@ -31,4 +31,10 @@ fn main() {
} else {
println!("qwq");
}
let b = vec![1, 2, 3];
assert!(!b.is_empty(), "panic1");
assert!(!(b.is_empty() && a.is_empty()), "panic2");
assert!(!(a.is_empty() && !b.is_empty()), "panic3");
assert!(!(b.is_empty() || a.is_empty()), "panic4");
assert!(!(a.is_empty() || !b.is_empty()), "panic5");
}
16 changes: 16 additions & 0 deletions tests/ui/if_then_panic.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,4 +35,20 @@ fn main() {
} else {
println!("qwq");
}
let b = vec![1, 2, 3];
if b.is_empty() {
panic!("panic1");
}
if b.is_empty() && a.is_empty() {
panic!("panic2");
}
if a.is_empty() && !b.is_empty() {
panic!("panic3");
}
if b.is_empty() || a.is_empty() {
panic!("panic4");
}
if a.is_empty() || !b.is_empty() {
panic!("panic5");
}
}
42 changes: 41 additions & 1 deletion tests/ui/if_then_panic.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -16,5 +16,45 @@ LL | | panic!("qwqwq");
LL | | }
| |_____^ help: try: `assert!(a.is_empty(), "qwqwq");`

error: aborting due to 2 previous errors
error: only a `panic!` in `if`-then statement
--> $DIR/if_then_panic.rs:39:5
|
LL | / if b.is_empty() {
LL | | panic!("panic1");
LL | | }
| |_____^ help: try: `assert!(!b.is_empty(), "panic1");`

error: only a `panic!` in `if`-then statement
--> $DIR/if_then_panic.rs:42:5
|
LL | / if b.is_empty() && a.is_empty() {
LL | | panic!("panic2");
LL | | }
| |_____^ help: try: `assert!(!(b.is_empty() && a.is_empty()), "panic2");`

error: only a `panic!` in `if`-then statement
--> $DIR/if_then_panic.rs:45:5
|
LL | / if a.is_empty() && !b.is_empty() {
LL | | panic!("panic3");
LL | | }
| |_____^ help: try: `assert!(!(a.is_empty() && !b.is_empty()), "panic3");`

error: only a `panic!` in `if`-then statement
--> $DIR/if_then_panic.rs:48:5
|
LL | / if b.is_empty() || a.is_empty() {
LL | | panic!("panic4");
LL | | }
| |_____^ help: try: `assert!(!(b.is_empty() || a.is_empty()), "panic4");`

error: only a `panic!` in `if`-then statement
--> $DIR/if_then_panic.rs:51:5
|
LL | / if a.is_empty() || !b.is_empty() {
LL | | panic!("panic5");
LL | | }
| |_____^ help: try: `assert!(!(a.is_empty() || !b.is_empty()), "panic5");`

error: aborting due to 7 previous errors