52 lines
1.8 KiB
Rust
52 lines
1.8 KiB
Rust
use clippy_utils::ast_utils::is_useless_with_eq_exprs;
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use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
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use clippy_utils::macros::{find_assert_eq_args, first_node_macro_backtrace};
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use clippy_utils::{eq_expr_value, is_in_test_function};
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use rustc_hir::{BinOpKind, Expr};
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use rustc_lint::LateContext;
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use super::EQ_OP;
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pub(crate) fn check_assert<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
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if let Some((macro_call, macro_name))
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= first_node_macro_backtrace(cx, e).find_map(|macro_call| {
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let name = cx.tcx.item_name(macro_call.def_id);
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matches!(name.as_str(), "assert_eq" | "assert_ne" | "debug_assert_eq" | "debug_assert_ne")
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.then(|| (macro_call, name))
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})
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&& let Some((lhs, rhs, _)) = find_assert_eq_args(cx, e, macro_call.expn)
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&& eq_expr_value(cx, lhs, rhs)
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&& macro_call.is_local()
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&& !is_in_test_function(cx.tcx, e.hir_id)
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{
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span_lint(
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cx,
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EQ_OP,
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lhs.span.to(rhs.span),
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&format!("identical args used in this `{macro_name}!` macro call"),
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);
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}
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}
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pub(crate) fn check<'tcx>(
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cx: &LateContext<'tcx>,
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e: &'tcx Expr<'_>,
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op: BinOpKind,
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left: &'tcx Expr<'_>,
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right: &'tcx Expr<'_>,
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) {
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if is_useless_with_eq_exprs(op.into()) && eq_expr_value(cx, left, right) && !is_in_test_function(cx.tcx, e.hir_id) {
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span_lint_and_then(
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cx,
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EQ_OP,
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e.span,
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&format!("equal expressions as operands to `{}`", op.as_str()),
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|diag| {
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if let BinOpKind::Ne = op && cx.typeck_results().expr_ty(left).is_floating_point() {
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diag.note("if you intended to check if the operand is NaN, use `.is_nan()` instead");
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}
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},
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);
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}
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}
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