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Prefer if let chain over macro

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This commit is contained in:
Evan Typanski 2022-06-22 13:31:04 -04:00
parent 93e41d3305
commit c8df6d6970
1 changed files with 15 additions and 21 deletions
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36
clippy_lints/src/manual_rem_euclid.rs
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@ -2,7 +2,6 @@ use clippy_utils::consts::{constant_full_int, FullInt};
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::{meets_msrv, msrvs, path_to_local};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind, Node, TyKind};
use rustc_lint::{LateContext, LateLintPass};
@ -52,26 +51,22 @@ impl<'tcx> LateLintPass<'tcx> for ManualRemEuclid {
return;
}
if_chain! {
if let ExprKind::Binary(op1, ..) = expr.kind;
if op1.node == BinOpKind::Rem;
if let Some((const1, expr1)) = check_for_positive_int_constant(cx, expr, false);
if let ExprKind::Binary(op2, ..) = expr1.kind;
if op2.node == BinOpKind::Add;
if let Some((const2, expr2)) = check_for_positive_int_constant(cx, expr1, true);
if let ExprKind::Binary(op3, ..) = expr2.kind;
if op3.node == BinOpKind::Rem;
if let Some((const3, expr3)) = check_for_positive_int_constant(cx, expr2, false);
if const1 == const2 && const2 == const3;
if let ExprKind::Binary(op1, ..) = expr.kind
&& op1.node == BinOpKind::Rem
&& let Some((const1, expr1)) = check_for_positive_int_constant(cx, expr, false)
&& let ExprKind::Binary(op2, ..) = expr1.kind
&& op2.node == BinOpKind::Add
&& let Some((const2, expr2)) = check_for_positive_int_constant(cx, expr1, true)
&& let ExprKind::Binary(op3, ..) = expr2.kind
&& op3.node == BinOpKind::Rem
&& let Some((const3, expr3)) = check_for_positive_int_constant(cx, expr2, false)
&& const1 == const2 && const2 == const3
// Only apply if we see an explicit type annotation on the local.
if let Some(hir_id) = path_to_local(expr3);
let hir = cx.tcx.hir();
if let Some(Node::Binding(_)) = hir.find(hir_id);
let parent = hir.get_parent_node(hir_id);
if let Some(Node::Local(local)) = hir.find(parent);
if let Some(ty) = local.ty;
if !matches!(ty.kind, TyKind::Infer);
then {
&& let Some(hir_id) = path_to_local(expr3)
&& let Some(Node::Binding(_)) = cx.tcx.hir().find(hir_id)
&& let Some(Node::Local(local)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id))
&& let Some(ty) = local.ty
&& !matches!(ty.kind, TyKind::Infer) {
let mut app = Applicability::MachineApplicable;
let rem_of = snippet_with_applicability(cx, expr3.span, "_", &mut app);
span_lint_and_sugg(
@ -83,7 +78,6 @@ impl<'tcx> LateLintPass<'tcx> for ManualRemEuclid {
format!("{rem_of}.rem_euclid({const1})"),
app,
);
}
}
}