69 lines
1.9 KiB
Rust
69 lines
1.9 KiB
Rust
use super::utils::get_hint_if_single_char_arg;
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use if_chain::if_chain;
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use rustc_errors::Applicability;
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use rustc_hir as hir;
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use rustc_lint::LateContext;
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use rustc_middle::ty;
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use rustc_span::symbol::Symbol;
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use super::SINGLE_CHAR_PATTERN;
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const PATTERN_METHODS: [(&str, usize); 24] = [
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("contains", 0),
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("starts_with", 0),
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("ends_with", 0),
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("find", 0),
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("rfind", 0),
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("split", 0),
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("split_inclusive", 0),
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("rsplit", 0),
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("split_terminator", 0),
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("rsplit_terminator", 0),
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("splitn", 1),
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("rsplitn", 1),
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("split_once", 0),
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("rsplit_once", 0),
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("matches", 0),
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("rmatches", 0),
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("match_indices", 0),
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("rmatch_indices", 0),
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("strip_prefix", 0),
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("strip_suffix", 0),
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("trim_start_matches", 0),
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("trim_end_matches", 0),
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("replace", 0),
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("replacen", 0),
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];
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/// lint for length-1 `str`s for methods in `PATTERN_METHODS`
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pub(super) fn check(
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cx: &LateContext<'_>,
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_expr: &hir::Expr<'_>,
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method_name: Symbol,
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receiver: &hir::Expr<'_>,
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args: &[hir::Expr<'_>],
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) {
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for &(method, pos) in &PATTERN_METHODS {
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if_chain! {
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if let ty::Ref(_, ty, _) = cx.typeck_results().expr_ty_adjusted(receiver).kind();
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if *ty.kind() == ty::Str;
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if method_name.as_str() == method && args.len() > pos;
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let arg = &args[pos];
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let mut applicability = Applicability::MachineApplicable;
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if let Some(hint) = get_hint_if_single_char_arg(cx, arg, &mut applicability);
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then {
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span_lint_and_sugg(
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cx,
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SINGLE_CHAR_PATTERN,
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arg.span,
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"single-character string constant used as pattern",
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"try using a `char` instead",
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hint,
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applicability,
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);
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}
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}
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}
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}
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