Rustfmt
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705c6ec2a4
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95 changed files with 3090 additions and 2022 deletions
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@ -51,7 +51,7 @@ declare_lint! {
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"traits or impls with a public `len` method but no corresponding `is_empty` method"
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}
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#[derive(Copy,Clone)]
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#[derive(Copy, Clone)]
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pub struct LenZero;
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impl LintPass for LenZero {
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@ -91,24 +91,26 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for LenZero {
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fn check_trait_items(cx: &LateContext, item: &Item, trait_items: &[TraitItemRef]) {
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fn is_named_self(cx: &LateContext, item: &TraitItemRef, name: &str) -> bool {
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item.name == name &&
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if let AssociatedItemKind::Method { has_self } = item.kind {
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has_self &&
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{
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let did = cx.tcx.hir.local_def_id(item.id.node_id);
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cx.tcx.fn_sig(did).inputs().skip_binder().len() == 1
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if let AssociatedItemKind::Method { has_self } = item.kind {
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has_self &&
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{
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let did = cx.tcx.hir.local_def_id(item.id.node_id);
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cx.tcx.fn_sig(did).inputs().skip_binder().len() == 1
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}
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} else {
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false
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}
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} else {
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false
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}
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}
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if !trait_items.iter().any(|i| is_named_self(cx, i, "is_empty")) {
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if let Some(i) = trait_items.iter().find(|i| is_named_self(cx, i, "len")) {
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if cx.access_levels.is_exported(i.id.node_id) {
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span_lint(cx,
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LEN_WITHOUT_IS_EMPTY,
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item.span,
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&format!("trait `{}` has a `len` method but no `is_empty` method", item.name));
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span_lint(
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cx,
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LEN_WITHOUT_IS_EMPTY,
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item.span,
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&format!("trait `{}` has a `len` method but no `is_empty` method", item.name),
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);
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}
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}
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}
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@ -117,15 +119,15 @@ fn check_trait_items(cx: &LateContext, item: &Item, trait_items: &[TraitItemRef]
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fn check_impl_items(cx: &LateContext, item: &Item, impl_items: &[ImplItemRef]) {
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fn is_named_self(cx: &LateContext, item: &ImplItemRef, name: &str) -> bool {
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item.name == name &&
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if let AssociatedItemKind::Method { has_self } = item.kind {
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has_self &&
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{
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let did = cx.tcx.hir.local_def_id(item.id.node_id);
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cx.tcx.fn_sig(did).inputs().skip_binder().len() == 1
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if let AssociatedItemKind::Method { has_self } = item.kind {
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has_self &&
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{
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let did = cx.tcx.hir.local_def_id(item.id.node_id);
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cx.tcx.fn_sig(did).inputs().skip_binder().len() == 1
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}
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} else {
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false
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}
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} else {
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false
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}
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}
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let is_empty = if let Some(is_empty) = impl_items.iter().find(|i| is_named_self(cx, i, "is_empty")) {
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@ -143,10 +145,12 @@ fn check_impl_items(cx: &LateContext, item: &Item, impl_items: &[ImplItemRef]) {
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let def_id = cx.tcx.hir.local_def_id(item.id);
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let ty = cx.tcx.type_of(def_id);
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span_lint(cx,
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LEN_WITHOUT_IS_EMPTY,
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item.span,
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&format!("item `{}` has a public `len` method but {} `is_empty` method", ty, is_empty));
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span_lint(
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cx,
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LEN_WITHOUT_IS_EMPTY,
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item.span,
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&format!("item `{}` has a public `len` method but {} `is_empty` method", ty, is_empty),
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);
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}
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}
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}
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@ -170,12 +174,14 @@ fn check_cmp(cx: &LateContext, span: Span, left: &Expr, right: &Expr, op: &str)
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fn check_len_zero(cx: &LateContext, span: Span, name: Name, args: &[Expr], lit: &Lit, op: &str) {
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if let Spanned { node: LitKind::Int(0, _), .. } = *lit {
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if name == "len" && args.len() == 1 && has_is_empty(cx, &args[0]) {
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span_lint_and_sugg(cx,
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LEN_ZERO,
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span,
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"length comparison to zero",
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"using `is_empty` is more concise",
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format!("{}{}.is_empty()", op, snippet(cx, args[0].span, "_")));
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span_lint_and_sugg(
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cx,
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LEN_ZERO,
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span,
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"length comparison to zero",
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"using `is_empty` is more concise",
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format!("{}{}.is_empty()", op, snippet(cx, args[0].span, "_")),
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);
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}
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}
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}
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@ -199,10 +205,11 @@ fn has_is_empty(cx: &LateContext, expr: &Expr) -> bool {
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/// Check the inherent impl's items for an `is_empty(self)` method.
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fn has_is_empty_impl(cx: &LateContext, id: DefId) -> bool {
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cx.tcx
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.inherent_impls(id)
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.iter()
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.any(|imp| cx.tcx.associated_items(*imp).any(|item| is_is_empty(cx, &item)))
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cx.tcx.inherent_impls(id).iter().any(|imp| {
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cx.tcx.associated_items(*imp).any(
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|item| is_is_empty(cx, &item),
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)
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})
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}
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let ty = &walk_ptrs_ty(cx.tables.expr_ty(expr));
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@ -212,7 +219,12 @@ fn has_is_empty(cx: &LateContext, expr: &Expr) -> bool {
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.associated_items(ty.ty_to_def_id().expect("trait impl not found"))
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.any(|item| is_is_empty(cx, &item))
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},
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ty::TyProjection(_) => ty.ty_to_def_id().map_or(false, |id| has_is_empty_impl(cx, id)),
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ty::TyProjection(_) => {
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ty.ty_to_def_id().map_or(
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false,
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|id| has_is_empty_impl(cx, id),
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)
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},
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ty::TyAdt(id, _) => has_is_empty_impl(cx, id.did),
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ty::TyArray(..) | ty::TySlice(..) | ty::TyStr => true,
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_ => false,
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