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Refactor excessive_bools:

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* Check HIR tree before checking for macros.
* Check item count before checking for bools.
This commit is contained in:
Jason Newcomb 2024-06-11 00:25:17 -04:00
parent 1b0230cf25
commit f178316ae2
1 changed files with 44 additions and 53 deletions
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97
clippy_lints/src/excessive_bools.rs
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@ -87,12 +87,6 @@ pub struct ExcessiveBools {
max_fn_params_bools: u64,
}
#[derive(Eq, PartialEq, Debug, Copy, Clone)]
enum Kind {
Struct,
Fn,
}
impl ExcessiveBools {
#[must_use]
pub fn new(max_struct_bools: u64, max_fn_params_bools: u64) -> Self {
@ -101,55 +95,50 @@ impl ExcessiveBools {
max_fn_params_bools,
}
}
fn too_many_bools<'tcx>(&self, tys: impl Iterator<Item = &'tcx Ty<'tcx>>, kind: Kind) -> bool {
if let Ok(bools) = tys.filter(|ty| is_bool(ty)).count().try_into() {
(if Kind::Fn == kind {
self.max_fn_params_bools
} else {
self.max_struct_bools
}) < bools
} else {
false
}
}
fn check_fn_sig(&self, cx: &LateContext<'_>, fn_decl: &FnDecl<'_>, span: Span) {
if !span.from_expansion() && self.too_many_bools(fn_decl.inputs.iter(), Kind::Fn) {
span_lint_and_help(
cx,
FN_PARAMS_EXCESSIVE_BOOLS,
span,
format!("more than {} bools in function parameters", self.max_fn_params_bools),
None,
"consider refactoring bools into two-variant enums",
);
}
}
}
impl_lint_pass!(ExcessiveBools => [STRUCT_EXCESSIVE_BOOLS, FN_PARAMS_EXCESSIVE_BOOLS]);
fn has_n_bools<'tcx>(iter: impl Iterator<Item = &'tcx Ty<'tcx>>, mut count: u64) -> bool {
iter.filter(|ty| is_bool(ty)).any(|_| {
let (x, overflow) = count.overflowing_sub(1);
count = x;
overflow
})
}
fn check_fn_decl(cx: &LateContext<'_>, decl: &FnDecl<'_>, sp: Span, max: u64) {
if has_n_bools(decl.inputs.iter(), max) && !sp.from_expansion() {
span_lint_and_help(
cx,
FN_PARAMS_EXCESSIVE_BOOLS,
sp,
format!("more than {max} bools in function parameters"),
None,
"consider refactoring bools into two-variant enums",
);
}
}
impl<'tcx> LateLintPass<'tcx> for ExcessiveBools {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
if item.span.from_expansion() {
return;
}
if let ItemKind::Struct(variant_data, _) = &item.kind {
if has_repr_attr(cx, item.hir_id()) {
return;
}
if self.too_many_bools(variant_data.fields().iter().map(|field| field.ty), Kind::Struct) {
span_lint_and_help(
cx,
STRUCT_EXCESSIVE_BOOLS,
item.span,
format!("more than {} bools in a struct", self.max_struct_bools),
None,
"consider using a state machine or refactoring bools into two-variant enums",
);
}
if let ItemKind::Struct(variant_data, _) = &item.kind
&& variant_data.fields().len() as u64 > self.max_struct_bools
&& has_n_bools(
variant_data.fields().iter().map(|field| field.ty),
self.max_struct_bools,
)
&& !has_repr_attr(cx, item.hir_id())
&& !item.span.from_expansion()
{
span_lint_and_help(
cx,
STRUCT_EXCESSIVE_BOOLS,
item.span,
format!("more than {} bools in a struct", self.max_struct_bools),
None,
"consider using a state machine or refactoring bools into two-variant enums",
);
}
}
@ -157,8 +146,9 @@ impl<'tcx> LateLintPass<'tcx> for ExcessiveBools {
// functions with a body are already checked by `check_fn`
if let TraitItemKind::Fn(fn_sig, TraitFn::Required(_)) = &trait_item.kind
&& fn_sig.header.abi == Abi::Rust
&& fn_sig.decl.inputs.len() as u64 > self.max_fn_params_bools
{
self.check_fn_sig(cx, fn_sig.decl, fn_sig.span);
check_fn_decl(cx, fn_sig.decl, fn_sig.span, self.max_fn_params_bools);
}
}
@ -171,12 +161,13 @@ impl<'tcx> LateLintPass<'tcx> for ExcessiveBools {
span: Span,
def_id: LocalDefId,
) {
let hir_id = cx.tcx.local_def_id_to_hir_id(def_id);
if let Some(fn_header) = fn_kind.header()
&& fn_header.abi == Abi::Rust
&& get_parent_as_impl(cx.tcx, hir_id).map_or(true, |impl_item| impl_item.of_trait.is_none())
&& fn_decl.inputs.len() as u64 > self.max_fn_params_bools
&& get_parent_as_impl(cx.tcx, cx.tcx.local_def_id_to_hir_id(def_id))
.map_or(true, |impl_item| impl_item.of_trait.is_none())
{
self.check_fn_sig(cx, fn_decl, span);
check_fn_decl(cx, fn_decl, span, self.max_fn_params_bools);
}
}
}