53 lines
1.8 KiB
Rust
53 lines
1.8 KiB
Rust
use clippy_utils::consts::{constant_context, Constant};
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::source::snippet;
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use clippy_utils::ty::is_type_diagnostic_item;
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use rustc_errors::Applicability;
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use rustc_hir::Expr;
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use rustc_lint::LateContext;
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use rustc_span::sym;
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use super::REPEAT_ONCE;
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pub(super) fn check<'tcx>(
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cx: &LateContext<'tcx>,
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expr: &'tcx Expr<'_>,
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recv: &'tcx Expr<'_>,
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repeat_arg: &'tcx Expr<'_>,
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) {
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if constant_context(cx, cx.typeck_results()).expr(repeat_arg) == Some(Constant::Int(1)) {
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let ty = cx.typeck_results().expr_ty(recv).peel_refs();
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if ty.is_str() {
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span_lint_and_sugg(
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cx,
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REPEAT_ONCE,
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expr.span,
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"calling `repeat(1)` on str",
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"consider using `.to_string()` instead",
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format!("{}.to_string()", snippet(cx, recv.span, r#""...""#)),
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Applicability::MachineApplicable,
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);
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} else if ty.builtin_index().is_some() {
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span_lint_and_sugg(
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cx,
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REPEAT_ONCE,
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expr.span,
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"calling `repeat(1)` on slice",
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"consider using `.to_vec()` instead",
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format!("{}.to_vec()", snippet(cx, recv.span, r#""...""#)),
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Applicability::MachineApplicable,
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);
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} else if is_type_diagnostic_item(cx, ty, sym::String) {
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span_lint_and_sugg(
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cx,
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REPEAT_ONCE,
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expr.span,
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"calling `repeat(1)` on a string literal",
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"consider using `.clone()` instead",
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format!("{}.clone()", snippet(cx, recv.span, r#""...""#)),
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Applicability::MachineApplicable,
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);
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}
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}
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}
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