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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,210 @@ | ||
| use clippy_config::msrvs::{Msrv, NUMERIC_ASSOCIATED_CONSTANTS}; | ||
| use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir_and_then}; | ||
| use clippy_utils::source::snippet_opt; | ||
| use clippy_utils::{get_parent_expr, is_from_proc_macro, last_path_segment, std_or_core}; | ||
| use rustc_errors::{Applicability, SuggestionStyle}; | ||
| use rustc_hir::def::{DefKind, Res}; | ||
| use rustc_hir::{ExprKind, Item, ItemKind, PrimTy, QPath, TyKind, UseKind}; | ||
| use rustc_lint::{LateContext, LateLintPass, LintContext}; | ||
| use rustc_middle::lint::in_external_macro; | ||
| use rustc_session::impl_lint_pass; | ||
| use rustc_span::symbol::kw; | ||
| use rustc_span::{sym, Symbol}; | ||
|
|
||
| declare_clippy_lint! { | ||
| /// ### What it does | ||
| /// Checks for usage of `<integer>::max_value()`, `std::<integer>::MAX`, | ||
| /// `std::<float>::EPSILON`, etc. | ||
| /// | ||
| /// ### Why is this bad? | ||
| /// All of these have been superceded by the associated constants on their respective types, | ||
| /// such as `i128::MAX`. These legacy items may be deprecated in a future version of rust. | ||
| /// | ||
| /// ### Example | ||
| /// ```rust | ||
| /// let eps = std::f32::EPSILON; | ||
| /// ``` | ||
| /// Use instead: | ||
| /// ```rust | ||
| /// let eps = f32::EPSILON; | ||
| /// ``` | ||
| #[clippy::version = "1.72.0"] | ||
| pub LEGACY_NUMERIC_CONSTANTS, | ||
| style, | ||
| "checks for usage of legacy std numeric constants and methods" | ||
| } | ||
| pub struct LegacyNumericConstants { | ||
| msrv: Msrv, | ||
| } | ||
|
|
||
| impl LegacyNumericConstants { | ||
| #[must_use] | ||
| pub fn new(msrv: Msrv) -> Self { | ||
| Self { msrv } | ||
| } | ||
| } | ||
|
|
||
| impl_lint_pass!(LegacyNumericConstants => [LEGACY_NUMERIC_CONSTANTS]); | ||
|
|
||
| impl<'tcx> LateLintPass<'tcx> for LegacyNumericConstants { | ||
| fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) { | ||
| let Self { msrv } = self; | ||
|
|
||
| if !msrv.meets(NUMERIC_ASSOCIATED_CONSTANTS) || in_external_macro(cx.sess(), item.span) { | ||
| return; | ||
| } | ||
|
|
||
| // These modules are "TBD" deprecated, and the contents are too, so | ||
| // lint on the `use` statement directly. | ||
| if let ItemKind::Use(path, kind @ (UseKind::Single | UseKind::Glob)) = item.kind | ||
| && let Some(def_id) = path.res[0].opt_def_id() | ||
| && let def_path = cx.get_def_path(def_id) | ||
| && is_path_in_numeric_module(&def_path, true) | ||
| { | ||
| let plurality = matches!( | ||
| kind, | ||
| UseKind::Glob | UseKind::Single if matches!(path.res[0], Res::Def(DefKind::Mod, _)), | ||
| ); | ||
|
|
||
| span_lint_and_then( | ||
| cx, | ||
| LEGACY_NUMERIC_CONSTANTS, | ||
| path.span, | ||
| if plurality { | ||
| "importing legacy numeric constants" | ||
| } else { | ||
| "importing a legacy numeric constant" | ||
| }, | ||
| |diag| { | ||
| if item.ident.name == kw::Underscore { | ||
| diag.help("remove this import"); | ||
| return; | ||
| } | ||
|
|
||
| if plurality && let [.., module_name] = &*def_path { | ||
| diag.help("remove this import").note(format!( | ||
| "then `{module_name}::<CONST>` will resolve to the respective associated constant" | ||
| )); | ||
| } else if let [.., module_name, name] = &*def_path { | ||
| diag.help( | ||
| format!("remove this import and use the associated constant `{module_name}::{name}` from the primitive type instead") | ||
| ); | ||
| } | ||
| }, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx>) { | ||
| let Self { msrv } = self; | ||
|
|
||
| if !msrv.meets(NUMERIC_ASSOCIATED_CONSTANTS) || in_external_macro(cx.sess(), expr.span) { | ||
| return; | ||
| } | ||
| let ExprKind::Path(qpath) = expr.kind else { | ||
| return; | ||
| }; | ||
|
|
||
| // `std::<integer>::<CONST>` check | ||
| let (span, sugg, msg) = if let QPath::Resolved(None, path) = qpath | ||
| && let Some(def_id) = path.res.opt_def_id() | ||
| && let path = cx.get_def_path(def_id) | ||
| && is_path_in_numeric_module(&path, false) | ||
| && let [.., module_name, name] = &*path | ||
| && let Some(snippet) = snippet_opt(cx, expr.span) | ||
| && let is_float_module = (*module_name == sym::f32 || *module_name == sym::f64) | ||
| // Skip linting if this usage looks identical to the associated constant, since this | ||
| // would only require removing a `use` import. We don't ignore ones from `f32` or `f64`, however. | ||
| && let identical = snippet == format!("{module_name}::{name}") | ||
| && (!identical || is_float_module) | ||
| { | ||
| ( | ||
| expr.span, | ||
| if identical { | ||
| None | ||
| } else { | ||
| Some(format!("{module_name}::{name}")) | ||
| }, | ||
| "usage of a legacy numeric constant", | ||
| ) | ||
| // `<integer>::xxx_value` check | ||
| } else if let QPath::TypeRelative(ty, _) = qpath | ||
| && let TyKind::Path(ty_qpath) = ty.kind | ||
| && let Res::PrimTy(PrimTy::Int(_) | PrimTy::Uint(_)) = cx.qpath_res(&ty_qpath, ty.hir_id) | ||
| && let last_segment = last_path_segment(&qpath) | ||
| && let name = last_segment.ident.name.as_str() | ||
| && (name == "max_value" || name == "min_value") | ||
| // Also remove the `()` | ||
| && let Some(par_expr) = get_parent_expr(cx, expr) | ||
| && let ExprKind::Call(_, _) = par_expr.kind | ||
| { | ||
| ( | ||
| last_segment.ident.span.with_hi(par_expr.span.hi()), | ||
| Some(name[..=2].to_ascii_uppercase()), | ||
| "usage of a legacy numeric method", | ||
| ) | ||
| } else { | ||
| return; | ||
| }; | ||
|
|
||
| if is_from_proc_macro(cx, expr) { | ||
| return; | ||
| } | ||
|
|
||
| span_lint_hir_and_then(cx, LEGACY_NUMERIC_CONSTANTS, expr.hir_id, span, msg, |diag| { | ||
| if let Some(sugg) = sugg { | ||
| diag.span_suggestion_with_style( | ||
| span, | ||
| "use the associated constant instead", | ||
| sugg, | ||
| Applicability::MaybeIncorrect, | ||
| SuggestionStyle::ShowAlways, | ||
| ); | ||
| } else if let Some(std_or_core) = std_or_core(cx) | ||
| && let QPath::Resolved(None, path) = qpath | ||
| { | ||
| diag.help(format!( | ||
| "remove the import that brings `{std_or_core}::{}` into scope", | ||
| // Must be `<module>::<CONST>` if `needs_import_removed` is true yet is | ||
| // being linted | ||
| path.segments[0].ident.name, | ||
| )); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| extract_msrv_attr!(LateContext); | ||
| } | ||
|
|
||
| fn is_path_in_numeric_module(path: &[Symbol], ignore_float_modules: bool) -> bool { | ||
| if let [ | ||
| sym::core, | ||
| module @ (sym::u8 | ||
| | sym::i8 | ||
| | sym::u16 | ||
| | sym::i16 | ||
| | sym::u32 | ||
| | sym::i32 | ||
| | sym::u64 | ||
| | sym::i64 | ||
| | sym::u128 | ||
| | sym::i128 | ||
| | sym::usize | ||
| | sym::isize | ||
| | sym::f32 | ||
| | sym::f64), | ||
| .., | ||
| ] = path | ||
| && !path.get(2).is_some_and(|&s| s == sym!(consts)) | ||
| { | ||
| // If `ignore_float_modules` is `true`, return `None` for `_::f32` or `_::f64`, but not | ||
| // _::f64::MAX` or similar. | ||
| if ignore_float_modules && (*module == sym::f32 || *module == sym::f64) && path.get(2).is_none() { | ||
| return false; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| false | ||
| } |
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