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https://github.com/rust-lang/rust-clippy
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wrong_self_convention: to_ respects Copy types
More details here: https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
This commit is contained in:
Mateusz Gacek
parent
56161b2982
commit
ea15fb2177
8 changed files with 143 additions and 90 deletions
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@ -193,14 +193,18 @@ declare_clippy_lint! {
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/// **What it does:** Checks for methods with certain name prefixes and which
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/// doesn't match how self is taken. The actual rules are:
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///
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/// |Prefix |Postfix |`self` taken |
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/// |-------|------------|----------------------|
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/// |`as_` | none |`&self` or `&mut self`|
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/// |`from_`| none | none |
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/// |`into_`| none |`self` |
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/// |`is_` | none |`&self` or none |
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/// |`to_` | `_mut` |`&mut &self` |
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/// |`to_` | not `_mut` |`&self` |
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/// |Prefix |Postfix |`self` taken | `self` type |
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/// |-------|------------|-----------------------|--------------|
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/// |`as_` | none |`&self` or `&mut self` | any |
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/// |`from_`| none | none | any |
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/// |`into_`| none |`self` | any |
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/// |`is_` | none |`&self` or none | any |
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/// |`to_` | `_mut` |`&mut self` | any |
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/// |`to_` | not `_mut` |`self` | `Copy` |
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/// |`to_` | not `_mut` |`&self` | not `Copy` |
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///
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/// Please find more info here:
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/// https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
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///
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/// **Why is this bad?** Consistency breeds readability. If you follow the
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/// conventions, your users won't be surprised that they, e.g., need to supply a
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@ -1837,10 +1841,7 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
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let item = cx.tcx.hir().expect_item(parent);
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let self_ty = cx.tcx.type_of(item.def_id);
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// if this impl block implements a trait, lint in trait definition instead
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if let hir::ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }) = item.kind {
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return;
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}
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let implements_trait = matches!(item.kind, hir::ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }));
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if_chain! {
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if let hir::ImplItemKind::Fn(ref sig, id) = impl_item.kind;
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@ -1855,7 +1856,8 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
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if let Some(first_arg_ty) = first_arg_ty;
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then {
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if cx.access_levels.is_exported(impl_item.hir_id()) {
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// if this impl block implements a trait, lint in trait definition instead
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if !implements_trait && cx.access_levels.is_exported(impl_item.hir_id()) {
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// check missing trait implementations
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for method_config in &TRAIT_METHODS {
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if name == method_config.method_name &&
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@ -1891,11 +1893,17 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
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item.vis.node.is_pub(),
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self_ty,
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first_arg_ty,
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first_arg.pat.span
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first_arg.pat.span,
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false
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);
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}
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}
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// if this impl block implements a trait, lint in trait definition instead
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if implements_trait {
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return;
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}
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if let hir::ImplItemKind::Fn(_, _) = impl_item.kind {
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let ret_ty = return_ty(cx, impl_item.hir_id());
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@ -1947,7 +1955,8 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
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false,
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self_ty,
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first_arg_ty,
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first_arg_span
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first_arg_span,
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true
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);
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}
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}
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@ -1,5 +1,6 @@
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use crate::methods::SelfKind;
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use clippy_utils::diagnostics::span_lint_and_help;
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use clippy_utils::ty::is_copy;
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use rustc_lint::LateContext;
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use rustc_middle::ty::TyS;
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use rustc_span::source_map::Span;
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@ -9,7 +10,7 @@ use super::WRONG_PUB_SELF_CONVENTION;
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use super::WRONG_SELF_CONVENTION;
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#[rustfmt::skip]
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const CONVENTIONS: [(&[Convention], &[SelfKind]); 8] = [
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const CONVENTIONS: [(&[Convention], &[SelfKind]); 9] = [
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(&[Convention::Eq("new")], &[SelfKind::No]),
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(&[Convention::StartsWith("as_")], &[SelfKind::Ref, SelfKind::RefMut]),
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(&[Convention::StartsWith("from_")], &[SelfKind::No]),
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@ -17,7 +18,11 @@ const CONVENTIONS: [(&[Convention], &[SelfKind]); 8] = [
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(&[Convention::StartsWith("is_")], &[SelfKind::Ref, SelfKind::No]),
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(&[Convention::Eq("to_mut")], &[SelfKind::RefMut]),
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(&[Convention::StartsWith("to_"), Convention::EndsWith("_mut")], &[SelfKind::RefMut]),
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(&[Convention::StartsWith("to_"), Convention::NotEndsWith("_mut")], &[SelfKind::Ref]),
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// Conversion using `to_` can use borrowed (non-Copy types) or owned (Copy types).
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// Source: https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
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(&[Convention::StartsWith("to_"), Convention::NotEndsWith("_mut"), Convention::IsSelfTypeCopy(false), Convention::ImplementsTrait(false)], &[SelfKind::Ref]),
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(&[Convention::StartsWith("to_"), Convention::NotEndsWith("_mut"), Convention::IsSelfTypeCopy(true), Convention::ImplementsTrait(false)], &[SelfKind::Value]),
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];
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enum Convention {
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@ -25,16 +30,20 @@ enum Convention {
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StartsWith(&'static str),
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EndsWith(&'static str),
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NotEndsWith(&'static str),
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IsSelfTypeCopy(bool),
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ImplementsTrait(bool),
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}
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impl Convention {
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#[must_use]
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fn check(&self, other: &str) -> bool {
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fn check<'tcx>(&self, cx: &LateContext<'tcx>, self_ty: &'tcx TyS<'tcx>, other: &str, is_trait_def: bool) -> bool {
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match *self {
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Self::Eq(this) => this == other,
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Self::StartsWith(this) => other.starts_with(this) && this != other,
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Self::EndsWith(this) => other.ends_with(this) && this != other,
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Self::NotEndsWith(this) => !Self::EndsWith(this).check(other),
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Self::NotEndsWith(this) => !Self::EndsWith(this).check(cx, self_ty, other, is_trait_def),
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Self::IsSelfTypeCopy(is_true) => is_true == is_copy(cx, self_ty),
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Self::ImplementsTrait(is_true) => is_true == is_trait_def,
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}
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}
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}
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@ -46,6 +55,10 @@ impl fmt::Display for Convention {
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Self::StartsWith(this) => this.fmt(f).and_then(|_| '*'.fmt(f)),
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Self::EndsWith(this) => '*'.fmt(f).and_then(|_| this.fmt(f)),
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Self::NotEndsWith(this) => '~'.fmt(f).and_then(|_| this.fmt(f)),
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Self::IsSelfTypeCopy(is_true) => format!("self type is {} Copy", if is_true { "" } else { "not" }).fmt(f),
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Self::ImplementsTrait(is_true) => {
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format!("Method {} implement a trait", if is_true { "" } else { "do not" }).fmt(f)
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},
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}
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}
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}
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@ -57,45 +70,42 @@ pub(super) fn check<'tcx>(
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self_ty: &'tcx TyS<'tcx>,
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first_arg_ty: &'tcx TyS<'tcx>,
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first_arg_span: Span,
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is_trait_item: bool,
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) {
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let lint = if is_pub {
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WRONG_PUB_SELF_CONVENTION
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} else {
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WRONG_SELF_CONVENTION
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};
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if let Some((conventions, self_kinds)) = &CONVENTIONS
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if let Some((conventions, self_kinds)) = &CONVENTIONS.iter().find(|(convs, _)| {
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convs
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.iter()
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.find(|(convs, _)| convs.iter().all(|conv| conv.check(item_name)))
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{
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.all(|conv| conv.check(cx, self_ty, item_name, is_trait_item))
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}) {
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if !self_kinds.iter().any(|k| k.matches(cx, self_ty, first_arg_ty)) {
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let suggestion = {
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if conventions.len() > 1 {
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let special_case = {
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// Don't mention `NotEndsWith` when there is also `StartsWith` convention present
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if conventions.len() == 2 {
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match conventions {
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[Convention::StartsWith(starts_with), Convention::NotEndsWith(_)]
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| [Convention::NotEndsWith(_), Convention::StartsWith(starts_with)] => {
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Some(format!("methods called `{}`", Convention::StartsWith(starts_with)))
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},
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_ => None,
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}
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} else {
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None
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}
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};
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let cut_ends_with_conv = conventions.iter().any(|conv| matches!(conv, Convention::StartsWith(_)))
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&& conventions
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.iter()
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.any(|conv| matches!(conv, Convention::NotEndsWith(_)));
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if let Some(suggestion) = special_case {
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suggestion
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} else {
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let s = conventions
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.iter()
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.map(|c| format!("`{}`", &c.to_string()))
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.filter_map(|conv| {
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if (cut_ends_with_conv && matches!(conv, Convention::NotEndsWith(_)))
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|| matches!(conv, Convention::ImplementsTrait(_))
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{
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None
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} else {
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Some(format!("`{}`", &conv.to_string()))
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}
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})
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.collect::<Vec<_>>()
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.join(" and ");
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format!("methods called like this: ({})", &s)
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}
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format!("methods with the following characteristics: ({})", &s)
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} else {
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format!("methods called `{}`", &conventions[0])
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}
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@ -79,6 +79,7 @@ mod issue2894 {
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}
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// This should not be linted
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#[allow(clippy::wrong_self_convention)]
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impl IntoBytes for u8 {
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fn to_bytes(&self) -> Vec<u8> {
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vec![*self]
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@ -79,6 +79,7 @@ mod issue2894 {
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}
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// This should not be linted
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#[allow(clippy::wrong_self_convention)]
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impl IntoBytes for u8 {
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fn to_bytes(&self) -> Vec<u8> {
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vec![*self]
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@ -37,139 +37,139 @@ LL | Foo::new()
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:93:24
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--> $DIR/use_self.rs:94:24
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LL | fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:93:55
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--> $DIR/use_self.rs:94:55
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LL | fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:108:13
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--> $DIR/use_self.rs:109:13
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LL | TS(0)
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| ^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:143:29
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--> $DIR/use_self.rs:144:29
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LL | fn bar() -> Bar {
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:144:21
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--> $DIR/use_self.rs:145:21
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LL | Bar { foo: Foo {} }
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:155:21
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--> $DIR/use_self.rs:156:21
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|
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LL | fn baz() -> Foo {
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:156:13
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--> $DIR/use_self.rs:157:13
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LL | Foo {}
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:173:21
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--> $DIR/use_self.rs:174:21
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|
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LL | let _ = Enum::B(42);
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| ^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:174:21
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--> $DIR/use_self.rs:175:21
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|
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LL | let _ = Enum::C { field: true };
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| ^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:175:21
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--> $DIR/use_self.rs:176:21
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|
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LL | let _ = Enum::A;
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| ^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:217:13
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--> $DIR/use_self.rs:218:13
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|
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LL | nested::A::fun_1();
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| ^^^^^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:218:13
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--> $DIR/use_self.rs:219:13
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|
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LL | nested::A::A;
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| ^^^^^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:220:13
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--> $DIR/use_self.rs:221:13
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|
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LL | nested::A {};
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| ^^^^^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:239:13
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--> $DIR/use_self.rs:240:13
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|
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LL | TestStruct::from_something()
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| ^^^^^^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:253:25
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--> $DIR/use_self.rs:254:25
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|
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LL | async fn g() -> S {
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| ^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:254:13
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--> $DIR/use_self.rs:255:13
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|
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LL | S {}
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| ^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:258:16
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--> $DIR/use_self.rs:259:16
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|
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LL | &p[S::A..S::B]
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| ^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:258:22
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--> $DIR/use_self.rs:259:22
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|
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LL | &p[S::A..S::B]
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| ^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:281:29
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--> $DIR/use_self.rs:282:29
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|
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LL | fn foo(value: T) -> Foo<T> {
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| ^^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:282:13
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--> $DIR/use_self.rs:283:13
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|
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LL | Foo { value }
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| ^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:319:21
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--> $DIR/use_self.rs:320:21
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|
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LL | type From = T::From;
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| ^^^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:320:19
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--> $DIR/use_self.rs:321:19
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|
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LL | type To = T::To;
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| ^^^^^ help: use the applicable keyword: `Self`
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error: unnecessary structure name repetition
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--> $DIR/use_self.rs:453:13
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--> $DIR/use_self.rs:454:13
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|
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LL | A::new::<submod::B>(submod::B {})
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| ^ help: use the applicable keyword: `Self`
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|
|
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|
@ -163,3 +163,35 @@ mod issue6307 {
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fn to_mut(&mut self);
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}
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}
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mod issue6727 {
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trait ToU64 {
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fn to_u64(self) -> u64;
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fn to_u64_v2(&self) -> u64;
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}
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#[derive(Clone, Copy)]
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struct FooCopy;
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impl ToU64 for FooCopy {
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fn to_u64(self) -> u64 {
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1
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}
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// trigger lint
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fn to_u64_v2(&self) -> u64 {
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1
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}
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}
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struct FooNoCopy;
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|
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impl ToU64 for FooNoCopy {
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// trigger lint
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fn to_u64(self) -> u64 {
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2
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}
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fn to_u64_v2(&self) -> u64 {
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2
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}
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}
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}
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|
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@ -39,7 +39,7 @@ LL | fn is_i32(self) {}
|
|||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called `to_*` usually take self by reference
|
||||
error: methods with the following characteristics: (`to_*` and `self type is not Copy`) usually take self by reference
|
||||
--> $DIR/wrong_self_convention.rs:42:15
|
||||
|
|
||||
LL | fn to_i32(self) {}
|
||||
|
|
@ -79,7 +79,7 @@ LL | pub fn is_i64(self) {}
|
|||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called `to_*` usually take self by reference
|
||||
error: methods with the following characteristics: (`to_*` and `self type is not Copy`) usually take self by reference
|
||||
--> $DIR/wrong_self_convention.rs:49:19
|
||||
|
|
||||
LL | pub fn to_i64(self) {}
|
||||
|
|
@ -119,14 +119,6 @@ LL | fn is_i32(self) {}
|
|||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called `to_*` usually take self by reference
|
||||
--> $DIR/wrong_self_convention.rs:102:19
|
||||
|
|
||||
LL | fn to_i32(self) {}
|
||||
| ^^^^
|
||||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called `from_*` usually take no self
|
||||
--> $DIR/wrong_self_convention.rs:104:21
|
||||
|
|
||||
|
|
@ -159,14 +151,6 @@ LL | fn is_i32(self);
|
|||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called `to_*` usually take self by reference
|
||||
--> $DIR/wrong_self_convention.rs:126:19
|
||||
|
|
||||
LL | fn to_i32(self);
|
||||
| ^^^^
|
||||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called `from_*` usually take no self
|
||||
--> $DIR/wrong_self_convention.rs:128:21
|
||||
|
|
||||
|
|
@ -191,5 +175,21 @@ LL | fn from_i32(self);
|
|||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods with the following characteristics: (`to_*` and `self type is Copy`) usually take self by value
|
||||
--> $DIR/wrong_self_convention.rs:181:22
|
||||
|
|
||||
LL | fn to_u64_v2(&self) -> u64 {
|
||||
| ^^^^^
|
||||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods with the following characteristics: (`to_*` and `self type is not Copy`) usually take self by reference
|
||||
--> $DIR/wrong_self_convention.rs:190:19
|
||||
|
|
||||
LL | fn to_u64(self) -> u64 {
|
||||
| ^^^^
|
||||
|
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: aborting due to 24 previous errors
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
error: methods called `to_*` usually take self by reference
|
||||
error: methods with the following characteristics: (`to_*` and `self type is not Copy`) usually take self by reference
|
||||
--> $DIR/wrong_self_conventions_mut.rs:15:24
|
||||
|
|
||||
LL | pub fn to_many(&mut self) -> Option<&mut [T]> {
|
||||
|
|
@ -7,7 +7,7 @@ LL | pub fn to_many(&mut self) -> Option<&mut [T]> {
|
|||
= note: `-D clippy::wrong-self-convention` implied by `-D warnings`
|
||||
= help: consider choosing a less ambiguous name
|
||||
|
||||
error: methods called like this: (`to_*` and `*_mut`) usually take self by mutable reference
|
||||
error: methods with the following characteristics: (`to_*` and `*_mut`) usually take self by mutable reference
|
||||
--> $DIR/wrong_self_conventions_mut.rs:23:28
|
||||
|
|
||||
LL | pub fn to_many_mut(&self) -> Option<&[T]> {
|
||||
|
|
|
|||
Loading…
Reference in a new issue