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Add lint unnecessary_option_map_or_else #14662
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73 changes: 73 additions & 0 deletions
73
clippy_lints/src/methods/unnecessary_option_map_or_else.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| use clippy_utils::diagnostics::span_lint_and_sugg; | ||
| use clippy_utils::peel_blocks; | ||
| use clippy_utils::source::snippet; | ||
| use clippy_utils::ty::is_type_diagnostic_item; | ||
| use rustc_errors::Applicability; | ||
| use rustc_hir::{Closure, Expr, ExprKind, HirId, QPath}; | ||
| use rustc_lint::LateContext; | ||
| use rustc_span::symbol::sym; | ||
|
|
||
| use super::UNNECESSARY_OPTION_MAP_OR_ELSE; | ||
| use super::utils::get_last_chain_binding_hir_id; | ||
|
|
||
| fn emit_lint(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, def_arg: &Expr<'_>) { | ||
| let msg = "unused \"map closure\" when calling `Option::map_or_else` value"; | ||
| let self_snippet = snippet(cx, recv.span, ".."); | ||
| let err_snippet = snippet(cx, def_arg.span, ".."); | ||
| span_lint_and_sugg( | ||
| cx, | ||
| UNNECESSARY_OPTION_MAP_OR_ELSE, | ||
| expr.span, | ||
| msg, | ||
| "consider using `unwrap_or_else`", | ||
| format!("{self_snippet}.unwrap_or_else({err_snippet})"), | ||
| Applicability::MachineApplicable, | ||
| ); | ||
| } | ||
|
|
||
| fn handle_qpath( | ||
| cx: &LateContext<'_>, | ||
| expr: &Expr<'_>, | ||
| recv: &Expr<'_>, | ||
| def_arg: &Expr<'_>, | ||
| expected_hir_id: HirId, | ||
| qpath: QPath<'_>, | ||
| ) { | ||
| if let QPath::Resolved(_, path) = qpath | ||
| && let rustc_hir::def::Res::Local(hir_id) = path.res | ||
| && expected_hir_id == hir_id | ||
| { | ||
| emit_lint(cx, expr, recv, def_arg); | ||
| } | ||
| } | ||
|
|
||
| /// lint use of `_.map_or_else(|err| err, |n| n)` for `Option`s. | ||
| pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, def_arg: &Expr<'_>, map_arg: &Expr<'_>) { | ||
| // lint if the caller of `map_or_else()` is an `Option` | ||
| if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(recv), sym::Option) | ||
| && let ExprKind::Closure(&Closure { body, .. }) = map_arg.kind | ||
| && let body = cx.tcx.hir_body(body) | ||
| && let Some(first_param) = body.params.first() | ||
| { | ||
| let body_expr = peel_blocks(body.value); | ||
|
|
||
| match body_expr.kind { | ||
| ExprKind::Path(qpath) => { | ||
| handle_qpath(cx, expr, recv, def_arg, first_param.pat.hir_id, qpath); | ||
| }, | ||
| // If this is a block (that wasn't peeled off), then it means there are statements. | ||
| ExprKind::Block(block, _) => { | ||
| if let Some(block_expr) = block.expr | ||
| // First we ensure that this is a "binding chain" (each statement is a binding | ||
| // of the previous one) and that it is a binding of the closure argument. | ||
| && let Some(last_chain_binding_id) = | ||
| get_last_chain_binding_hir_id(first_param.pat.hir_id, block.stmts) | ||
| && let ExprKind::Path(qpath) = block_expr.kind | ||
| { | ||
| handle_qpath(cx, expr, recv, def_arg, last_chain_binding_id, qpath); | ||
| } | ||
| }, | ||
| _ => {}, | ||
| } | ||
| } | ||
| } | ||
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We should use
snippet_with_applicabilityinstead here. Also the default forself_snippetshould be"_", not"..".