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Use a single if_chain

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This commit is contained in:
Manish Goregaokar 2021-09-27 22:09:23 -07:00
parent b6ffb29315
commit baec67e9de
1 changed files with 10 additions and 32 deletions
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42
clippy_lints/src/match_result_ok.rs
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@ -47,8 +47,15 @@ declare_lint_pass!(MatchResultOk => [MATCH_RESULT_OK]);
impl<'tcx> LateLintPass<'tcx> for MatchResultOk {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
let (let_pat, let_expr, ifwhile) = if let Some(higher::IfLet { let_pat, let_expr, .. }) = higher::IfLet::hir(cx, expr) {
(let_pat, let_expr, "if")
} else if let Some(higher::WhileLet { let_pat, let_expr, .. }) = higher::WhileLet::hir(expr) {
(let_pat, let_expr, "while")
} else {
return
};
if_chain! {
if let Some(higher::IfLet { let_pat, let_expr, .. }) = higher::IfLet::hir(cx, expr);
if let ExprKind::MethodCall(_, ok_span, [ref result_types_0, ..], _) = let_expr.kind; //check is expr.ok() has type Result<T,E>.ok(, _)
if let PatKind::TupleStruct(QPath::Resolved(_, x), y, _) = let_pat.kind; //get operation
if method_chain_args(let_expr, &["ok"]).is_some(); //test to see if using ok() methoduse std::marker::Sized;
@ -61,37 +68,8 @@ impl<'tcx> LateLintPass<'tcx> for MatchResultOk {
let some_expr_string = snippet_with_applicability(cx, y[0].span, "", &mut applicability);
let trimmed_ok = snippet_with_applicability(cx, let_expr.span.until(ok_span), "", &mut applicability);
let sugg = format!(
"if let Ok({}) = {}",
some_expr_string,
trimmed_ok.trim().trim_end_matches('.'),
);
span_lint_and_sugg(
cx,
MATCH_RESULT_OK,
expr.span.with_hi(let_expr.span.hi()),
"matching on `Some` with `ok()` is redundant",
&format!("consider matching on `Ok({})` and removing the call to `ok` instead", some_expr_string),
sugg,
applicability,
);
}
}
if_chain! {
if let Some(higher::WhileLet { let_pat, let_expr, .. }) = higher::WhileLet::hir(expr);
if let ExprKind::MethodCall(_, ok_span, [ref result_types_0, ..], _) = let_expr.kind; //check is expr.ok() has type Result<T,E>.ok(, _)
if let PatKind::TupleStruct(QPath::Resolved(_, x), y, _) = let_pat.kind; //get operation
if method_chain_args(let_expr, &["ok"]).is_some(); //test to see if using ok() methoduse std::marker::Sized;
if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(result_types_0), sym::result_type);
if rustc_hir_pretty::to_string(rustc_hir_pretty::NO_ANN, |s| s.print_path(x, false)) == "Some";
then {
let mut applicability = Applicability::MachineApplicable;
let some_expr_string = snippet_with_applicability(cx, y[0].span, "", &mut applicability);
let trimmed_ok = snippet_with_applicability(cx, let_expr.span.until(ok_span), "", &mut applicability);
let sugg = format!(
"while let Ok({}) = {}",
"{} let Ok({}) = {}",
ifwhile,
some_expr_string,
trimmed_ok.trim().trim_end_matches('.'),
);