mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-23 21:23:56 +00:00
Allow Self::cmp(self, other)
as a correct impl
This commit is contained in:
parent
d4a6634d37
commit
a4c367d0e9
7 changed files with 211 additions and 14 deletions
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@ -1,8 +1,9 @@
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use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
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use clippy_utils::paths::ORD_CMP;
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use clippy_utils::ty::implements_trait;
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use clippy_utils::{get_parent_node, is_res_lang_ctor, last_path_segment, path_res};
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use clippy_utils::{get_parent_node, is_res_lang_ctor, last_path_segment, match_def_path, path_res, std_or_core};
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use rustc_errors::Applicability;
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use rustc_hir::def::Res;
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use rustc_hir::def_id::LocalDefId;
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use rustc_hir::{Expr, ExprKind, ImplItem, ImplItemKind, ItemKind, LangItem, Node, UnOp};
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use rustc_hir_analysis::hir_ty_to_ty;
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use rustc_lint::{LateContext, LateLintPass};
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@ -60,6 +61,10 @@ declare_clippy_lint! {
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/// wrapping the result of `cmp` in `Some` for `partial_cmp`. Not doing this may silently
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/// introduce an error upon refactoring.
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///
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/// ### Known issues
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/// Code that calls the `.into()` method instead will be flagged as incorrect, despite `.into()`
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/// wrapping it in `Some`.
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///
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/// ### Limitations
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/// Will not lint if `Self` and `Rhs` do not have the same type.
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///
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@ -191,6 +196,11 @@ impl LateLintPass<'_> for IncorrectImpls {
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trait_impl.substs,
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)
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{
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// If the `cmp` call likely needs to be fully qualified in the suggestion
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// (like `std::cmp::Ord::cmp`). It's unfortunate we must put this here but we can't
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// access `cmp_expr` in the suggestion without major changes, as we lint in `else`.
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let mut needs_fully_qualified = false;
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if block.stmts.is_empty()
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&& let Some(expr) = block.expr
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&& let ExprKind::Call(
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@ -202,9 +212,8 @@ impl LateLintPass<'_> for IncorrectImpls {
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[cmp_expr],
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) = expr.kind
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&& is_res_lang_ctor(cx, cx.qpath_res(some_path, *some_hir_id), LangItem::OptionSome)
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&& let ExprKind::MethodCall(cmp_path, _, [other_expr], ..) = cmp_expr.kind
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&& cmp_path.ident.name == sym::cmp
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&& let Res::Local(..) = path_res(cx, other_expr)
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// Fix #11178, allow `Self::cmp(self, ..)` too
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&& self_cmp_call(cx, cmp_expr, impl_item.owner_id.def_id, &mut needs_fully_qualified)
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{} else {
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// If `Self` and `Rhs` are not the same type, bail. This makes creating a valid
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// suggestion tons more complex.
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@ -221,14 +230,29 @@ impl LateLintPass<'_> for IncorrectImpls {
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let [_, other] = body.params else {
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return;
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};
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let Some(std_or_core) = std_or_core(cx) else {
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return;
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};
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let suggs = if let Some(other_ident) = other.pat.simple_ident() {
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vec![(block.span, format!("{{ Some(self.cmp({})) }}", other_ident.name))]
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} else {
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vec![
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let suggs = match (other.pat.simple_ident(), needs_fully_qualified) {
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(Some(other_ident), true) => vec![(
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block.span,
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format!("{{ Some({std_or_core}::cmp::Ord::cmp(self, {})) }}", other_ident.name),
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)],
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(Some(other_ident), false) => {
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vec![(block.span, format!("{{ Some(self.cmp({})) }}", other_ident.name))]
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},
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(None, true) => vec![
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(
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block.span,
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format!("{{ Some({std_or_core}::cmp::Ord::cmp(self, other)) }}"),
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),
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(other.pat.span, "other".to_owned()),
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],
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(None, false) => vec![
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(block.span, "{ Some(self.cmp(other)) }".to_owned()),
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(other.pat.span, "other".to_owned()),
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]
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],
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};
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diag.multipart_suggestion(
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@ -242,3 +266,31 @@ impl LateLintPass<'_> for IncorrectImpls {
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}
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}
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}
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/// Returns whether this is any of `self.cmp(..)`, `Self::cmp(self, ..)` or `Ord::cmp(self, ..)`.
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fn self_cmp_call<'tcx>(
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cx: &LateContext<'tcx>,
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cmp_expr: &'tcx Expr<'tcx>,
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def_id: LocalDefId,
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needs_fully_qualified: &mut bool,
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) -> bool {
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match cmp_expr.kind {
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ExprKind::Call(path, [_self, _other]) => path_res(cx, path)
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.opt_def_id()
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.is_some_and(|def_id| match_def_path(cx, def_id, &ORD_CMP)),
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ExprKind::MethodCall(_, _, [_other], ..) => {
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// We can set this to true here no matter what as if it's a `MethodCall` and goes to the
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// `else` branch, it must be a method named `cmp` that isn't `Ord::cmp`
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*needs_fully_qualified = true;
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// It's a bit annoying but `typeck_results` only gives us the CURRENT body, which we
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// have none, not of any `LocalDefId` we want, so we must call the query itself to avoid
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// an immediate ICE
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cx.tcx
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.typeck(def_id)
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.type_dependent_def_id(cmp_expr.hir_id)
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.is_some_and(|def_id| match_def_path(cx, def_id, &ORD_CMP))
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},
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_ => false,
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}
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}
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@ -161,3 +161,4 @@ pub const OPTION_UNWRAP: [&str; 4] = ["core", "option", "Option", "unwrap"];
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pub const OPTION_EXPECT: [&str; 4] = ["core", "option", "Option", "expect"];
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pub const FORMATTER: [&str; 3] = ["core", "fmt", "Formatter"];
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pub const DEBUG_STRUCT: [&str; 4] = ["core", "fmt", "builders", "DebugStruct"];
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pub const ORD_CMP: [&str; 4] = ["core", "cmp", "Ord", "cmp"];
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@ -1,5 +1,4 @@
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//@run-rustfix
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#![allow(unused)]
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#![no_main]
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use std::cmp::Ordering;
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@ -112,3 +111,35 @@ impl PartialOrd<u32> for F {
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todo!();
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}
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}
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// #11178, do not lint
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#[derive(Eq, PartialEq)]
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struct G(u32);
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impl Ord for G {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl PartialOrd for G {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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Some(Self::cmp(self, other))
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}
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}
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#[derive(Eq, PartialEq)]
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struct H(u32);
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impl Ord for H {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl PartialOrd for H {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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Some(Ord::cmp(self, other))
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}
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}
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//@run-rustfix
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#![allow(unused)]
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#![no_main]
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use std::cmp::Ordering;
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@ -116,3 +115,35 @@ impl PartialOrd<u32> for F {
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todo!();
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}
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}
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// #11178, do not lint
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#[derive(Eq, PartialEq)]
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struct G(u32);
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impl Ord for G {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl PartialOrd for G {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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Some(Self::cmp(self, other))
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}
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}
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#[derive(Eq, PartialEq)]
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struct H(u32);
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impl Ord for H {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl PartialOrd for H {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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Some(Ord::cmp(self, other))
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}
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}
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@ -1,5 +1,5 @@
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error: incorrect implementation of `partial_cmp` on an `Ord` type
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--> $DIR/incorrect_partial_ord_impl_on_ord_type.rs:18:1
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--> $DIR/incorrect_partial_ord_impl_on_ord_type.rs:17:1
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LL | / impl PartialOrd for A {
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LL | | fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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@ -13,7 +13,7 @@ LL | | }
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= note: `#[deny(clippy::incorrect_partial_ord_impl_on_ord_type)]` on by default
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error: incorrect implementation of `partial_cmp` on an `Ord` type
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--> $DIR/incorrect_partial_ord_impl_on_ord_type.rs:52:1
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--> $DIR/incorrect_partial_ord_impl_on_ord_type.rs:51:1
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LL | / impl PartialOrd for C {
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LL | | fn partial_cmp(&self, _: &Self) -> Option<Ordering> {
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@ -0,0 +1,51 @@
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// This test's filename is... a bit verbose. But it ensures we suggest the correct code when `Ord`
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// is not in scope.
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#![no_main]
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#![no_implicit_prelude]
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extern crate std;
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use std::cmp::{self, Eq, Ordering, PartialEq, PartialOrd};
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use std::option::Option::{self, Some};
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use std::todo;
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// lint
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#[derive(Eq, PartialEq)]
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struct A(u32);
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impl cmp::Ord for A {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl PartialOrd for A {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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// NOTE: This suggestion is wrong, as `Ord` is not in scope. But this should be fine as it isn't
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// automatically applied
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todo!();
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}
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}
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#[derive(Eq, PartialEq)]
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struct B(u32);
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impl B {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl cmp::Ord for B {
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fn cmp(&self, other: &Self) -> Ordering {
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todo!();
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}
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}
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impl PartialOrd for B {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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// This calls `B.cmp`, not `Ord::cmp`!
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Some(self.cmp(other))
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}
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}
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error: incorrect implementation of `partial_cmp` on an `Ord` type
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--> $DIR/incorrect_partial_ord_impl_on_ord_type_fully_qual.rs:23:1
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LL | / impl PartialOrd for A {
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LL | | fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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| | _____________________________________________________________-
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LL | || // NOTE: This suggestion is wrong, as `Ord` is not in scope. But this should be fine as it isn't
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LL | || // automatically applied
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LL | || todo!();
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LL | || }
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| ||_____- help: change this to: `{ Some(self.cmp(other)) }`
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LL | | }
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| |__^
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= note: `#[deny(clippy::incorrect_partial_ord_impl_on_ord_type)]` on by default
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error: incorrect implementation of `partial_cmp` on an `Ord` type
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--> $DIR/incorrect_partial_ord_impl_on_ord_type_fully_qual.rs:46:1
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LL | / impl PartialOrd for B {
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LL | | fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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| | _____________________________________________________________-
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LL | || // This calls `B.cmp`, not `Ord::cmp`!
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LL | || Some(self.cmp(other))
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LL | || }
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| ||_____- help: change this to: `{ Some(std::cmp::Ord::cmp(self, other)) }`
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LL | | }
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| |__^
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error: aborting due to 2 previous errors
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