chore: fix identation of if_chain in filter_map
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chansuke
parent
a85e480dd1
commit
5b46f2db59
@ -30,12 +30,12 @@ fn is_method(cx: &LateContext<'_>, expr: &hir::Expr<'_>, method_name: Symbol) ->
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match closure_expr.kind {
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hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, receiver, ..) => {
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if_chain! {
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if ident.name == method_name;
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if let hir::ExprKind::Path(path) = &receiver.kind;
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if let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id);
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then {
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return arg_id == *local
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}
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if ident.name == method_name;
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if let hir::ExprKind::Path(path) = &receiver.kind;
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if let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id);
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then {
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return arg_id == *local
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}
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}
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false
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},
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@ -92,92 +92,92 @@ pub(super) fn check(
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}
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if_chain! {
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if is_trait_method(cx, map_recv, sym::Iterator);
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if is_trait_method(cx, map_recv, sym::Iterator);
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// filter(|x| ...is_some())...
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if let ExprKind::Closure(&Closure { body: filter_body_id, .. }) = filter_arg.kind;
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let filter_body = cx.tcx.hir().body(filter_body_id);
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if let [filter_param] = filter_body.params;
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// optional ref pattern: `filter(|&x| ..)`
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let (filter_pat, is_filter_param_ref) = if let PatKind::Ref(ref_pat, _) = filter_param.pat.kind {
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(ref_pat, true)
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// filter(|x| ...is_some())...
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if let ExprKind::Closure(&Closure { body: filter_body_id, .. }) = filter_arg.kind;
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let filter_body = cx.tcx.hir().body(filter_body_id);
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if let [filter_param] = filter_body.params;
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// optional ref pattern: `filter(|&x| ..)`
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let (filter_pat, is_filter_param_ref) = if let PatKind::Ref(ref_pat, _) = filter_param.pat.kind {
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(ref_pat, true)
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} else {
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(filter_param.pat, false)
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};
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// closure ends with is_some() or is_ok()
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if let PatKind::Binding(_, filter_param_id, _, None) = filter_pat.kind;
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if let ExprKind::MethodCall(path, filter_arg, [], _) = filter_body.value.kind;
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if let Some(opt_ty) = cx.typeck_results().expr_ty(filter_arg).peel_refs().ty_adt_def();
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if let Some(is_result) = if cx.tcx.is_diagnostic_item(sym::Option, opt_ty.did()) {
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Some(false)
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} else if cx.tcx.is_diagnostic_item(sym::Result, opt_ty.did()) {
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Some(true)
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} else {
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None
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};
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if path.ident.name.as_str() == if is_result { "is_ok" } else { "is_some" };
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// ...map(|x| ...unwrap())
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if let ExprKind::Closure(&Closure { body: map_body_id, .. }) = map_arg.kind;
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let map_body = cx.tcx.hir().body(map_body_id);
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if let [map_param] = map_body.params;
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if let PatKind::Binding(_, map_param_id, map_param_ident, None) = map_param.pat.kind;
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// closure ends with expect() or unwrap()
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if let ExprKind::MethodCall(seg, map_arg, ..) = map_body.value.kind;
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if matches!(seg.ident.name, sym::expect | sym::unwrap | sym::unwrap_or);
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// .filter(..).map(|y| f(y).copied().unwrap())
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// ~~~~
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let map_arg_peeled = match map_arg.kind {
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ExprKind::MethodCall(method, original_arg, [], _) if acceptable_methods(method) => {
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original_arg
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},
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_ => map_arg,
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};
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// .filter(|x| x.is_some()).map(|y| y[.acceptable_method()].unwrap())
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let simple_equal = path_to_local_id(filter_arg, filter_param_id)
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&& path_to_local_id(map_arg_peeled, map_param_id);
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let eq_fallback = |a: &Expr<'_>, b: &Expr<'_>| {
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// in `filter(|x| ..)`, replace `*x` with `x`
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let a_path = if_chain! {
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if !is_filter_param_ref;
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if let ExprKind::Unary(UnOp::Deref, expr_path) = a.kind;
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then { expr_path } else { a }
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};
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// let the filter closure arg and the map closure arg be equal
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path_to_local_id(a_path, filter_param_id)
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&& path_to_local_id(b, map_param_id)
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&& cx.typeck_results().expr_ty_adjusted(a) == cx.typeck_results().expr_ty_adjusted(b)
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};
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if simple_equal || SpanlessEq::new(cx).expr_fallback(eq_fallback).eq_expr(filter_arg, map_arg_peeled);
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then {
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let span = filter_span.with_hi(expr.span.hi());
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let (filter_name, lint) = if is_find {
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("find", MANUAL_FIND_MAP)
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} else {
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(filter_param.pat, false)
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("filter", MANUAL_FILTER_MAP)
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};
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// closure ends with is_some() or is_ok()
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if let PatKind::Binding(_, filter_param_id, _, None) = filter_pat.kind;
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if let ExprKind::MethodCall(path, filter_arg, [], _) = filter_body.value.kind;
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if let Some(opt_ty) = cx.typeck_results().expr_ty(filter_arg).peel_refs().ty_adt_def();
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if let Some(is_result) = if cx.tcx.is_diagnostic_item(sym::Option, opt_ty.did()) {
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Some(false)
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} else if cx.tcx.is_diagnostic_item(sym::Result, opt_ty.did()) {
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Some(true)
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let msg = format!("`{filter_name}(..).map(..)` can be simplified as `{filter_name}_map(..)`");
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let (to_opt, deref) = if is_result {
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(".ok()", String::new())
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} else {
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None
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let derefs = cx.typeck_results()
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.expr_adjustments(map_arg)
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.iter()
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.filter(|adj| matches!(adj.kind, Adjust::Deref(_)))
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.count();
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("", "*".repeat(derefs))
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};
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if path.ident.name.as_str() == if is_result { "is_ok" } else { "is_some" };
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// ...map(|x| ...unwrap())
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if let ExprKind::Closure(&Closure { body: map_body_id, .. }) = map_arg.kind;
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let map_body = cx.tcx.hir().body(map_body_id);
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if let [map_param] = map_body.params;
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if let PatKind::Binding(_, map_param_id, map_param_ident, None) = map_param.pat.kind;
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// closure ends with expect() or unwrap()
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if let ExprKind::MethodCall(seg, map_arg, ..) = map_body.value.kind;
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if matches!(seg.ident.name, sym::expect | sym::unwrap | sym::unwrap_or);
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// .filter(..).map(|y| f(y).copied().unwrap())
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// ~~~~
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let map_arg_peeled = match map_arg.kind {
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ExprKind::MethodCall(method, original_arg, [], _) if acceptable_methods(method) => {
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original_arg
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},
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_ => map_arg,
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};
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// .filter(|x| x.is_some()).map(|y| y[.acceptable_method()].unwrap())
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let simple_equal = path_to_local_id(filter_arg, filter_param_id)
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&& path_to_local_id(map_arg_peeled, map_param_id);
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let eq_fallback = |a: &Expr<'_>, b: &Expr<'_>| {
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// in `filter(|x| ..)`, replace `*x` with `x`
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let a_path = if_chain! {
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if !is_filter_param_ref;
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if let ExprKind::Unary(UnOp::Deref, expr_path) = a.kind;
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then { expr_path } else { a }
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};
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// let the filter closure arg and the map closure arg be equal
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path_to_local_id(a_path, filter_param_id)
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&& path_to_local_id(b, map_param_id)
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&& cx.typeck_results().expr_ty_adjusted(a) == cx.typeck_results().expr_ty_adjusted(b)
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};
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if simple_equal || SpanlessEq::new(cx).expr_fallback(eq_fallback).eq_expr(filter_arg, map_arg_peeled);
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then {
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let span = filter_span.with_hi(expr.span.hi());
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let (filter_name, lint) = if is_find {
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("find", MANUAL_FIND_MAP)
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} else {
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("filter", MANUAL_FILTER_MAP)
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};
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let msg = format!("`{filter_name}(..).map(..)` can be simplified as `{filter_name}_map(..)`");
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let (to_opt, deref) = if is_result {
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(".ok()", String::new())
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} else {
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let derefs = cx.typeck_results()
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.expr_adjustments(map_arg)
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.iter()
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.filter(|adj| matches!(adj.kind, Adjust::Deref(_)))
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.count();
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("", "*".repeat(derefs))
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};
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let sugg = format!(
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"{filter_name}_map(|{map_param_ident}| {deref}{}{to_opt})",
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snippet(cx, map_arg.span, ".."),
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);
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span_lint_and_sugg(cx, lint, span, &msg, "try", sugg, Applicability::MachineApplicable);
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}
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let sugg = format!(
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"{filter_name}_map(|{map_param_ident}| {deref}{}{to_opt})",
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snippet(cx, map_arg.span, ".."),
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);
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span_lint_and_sugg(cx, lint, span, &msg, "try", sugg, Applicability::MachineApplicable);
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}
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}
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}
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