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Use diagnostic items in into_iter_collections

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This commit is contained in:
Cameron Steffen 2021-02-26 21:17:29 -06:00
parent 2b3a731e1c
commit 7984e60d9e
3 changed files with 22 additions and 24 deletions
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4
clippy_lints/src/methods/mod.rs
View file

@ -24,7 +24,7 @@ use rustc_middle::ty::{self, TraitRef, Ty, TyS};
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::source_map::Span;
use rustc_span::symbol::{sym, SymbolStr};
use rustc_span::symbol::{sym, Symbol, SymbolStr};
use rustc_typeck::hir_ty_to_ty;
use crate::consts::{constant, Constant};
@ -3619,7 +3619,7 @@ fn lint_asref(cx: &LateContext<'_>, expr: &hir::Expr<'_>, call_name: &str, as_re
}
}
fn ty_has_iter_method(cx: &LateContext<'_>, self_ref_ty: Ty<'_>) -> Option<(&'static str, &'static str)> {
fn ty_has_iter_method(cx: &LateContext<'_>, self_ref_ty: Ty<'_>) -> Option<(Symbol, &'static str)> {
has_iter_method(cx, self_ref_ty).map(|ty_name| {
let mutbl = match self_ref_ty.kind() {
ty::Ref(_, _, mutbl) => mutbl,

40
clippy_utils/src/lib.rs
View file

@ -1295,24 +1295,24 @@ pub fn any_parent_is_automatically_derived(tcx: TyCtxt<'_>, node: HirId) -> bool
}
/// Returns true if ty has `iter` or `iter_mut` methods
pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<&'static str> {
pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<Symbol> {
// FIXME: instead of this hard-coded list, we should check if `<adt>::iter`
// exists and has the desired signature. Unfortunately FnCtxt is not exported
// so we can't use its `lookup_method` method.
let into_iter_collections: [&[&str]; 13] = [
&paths::VEC,
&paths::OPTION,
&paths::RESULT,
&paths::BTREESET,
&paths::BTREEMAP,
&paths::VEC_DEQUE,
&paths::LINKED_LIST,
&paths::BINARY_HEAP,
&paths::HASHSET,
&paths::HASHMAP,
&paths::PATH_BUF,
&paths::PATH,
&paths::RECEIVER,
let into_iter_collections: &[Symbol] = &[
sym::vec_type,
sym::option_type,
sym::result_type,
sym::BTreeMap,
sym::BTreeSet,
sym::vecdeque_type,
sym::LinkedList,
sym::BinaryHeap,
sym::hashset_type,
sym::hashmap_type,
sym::PathBuf,
sym::Path,
sym::Receiver,
];
let ty_to_check = match probably_ref_ty.kind() {
@ -1321,15 +1321,15 @@ pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<
};
let def_id = match ty_to_check.kind() {
ty::Array(..) => return Some("array"),
ty::Slice(..) => return Some("slice"),
ty::Array(..) => return Some(sym::array),
ty::Slice(..) => return Some(sym::slice),
ty::Adt(adt, _) => adt.did,
_ => return None,
};
for path in &into_iter_collections {
if match_def_path(cx, def_id, path) {
return Some(*path.last().unwrap());
for &name in into_iter_collections {
if cx.tcx.is_diagnostic_item(name, def_id) {
return Some(cx.tcx.item_name(def_id));
}
}
None

2
clippy_utils/src/paths.rs
View file

@ -99,7 +99,6 @@ pub(super) const PANIC_ANY: [&str; 3] = ["std", "panic", "panic_any"];
pub const PARKING_LOT_MUTEX_GUARD: [&str; 2] = ["parking_lot", "MutexGuard"];
pub const PARKING_LOT_RWLOCK_READ_GUARD: [&str; 2] = ["parking_lot", "RwLockReadGuard"];
pub const PARKING_LOT_RWLOCK_WRITE_GUARD: [&str; 2] = ["parking_lot", "RwLockWriteGuard"];
pub const PATH: [&str; 3] = ["std", "path", "Path"];
pub const PATH_BUF: [&str; 3] = ["std", "path", "PathBuf"];
pub const PATH_BUF_AS_PATH: [&str; 4] = ["std", "path", "PathBuf", "as_path"];
pub const PATH_TO_PATH_BUF: [&str; 4] = ["std", "path", "Path", "to_path_buf"];
@ -116,7 +115,6 @@ pub const PUSH_STR: [&str; 4] = ["alloc", "string", "String", "push_str"];
pub const RANGE_ARGUMENT_TRAIT: [&str; 3] = ["core", "ops", "RangeBounds"];
pub const RC: [&str; 3] = ["alloc", "rc", "Rc"];
pub const RC_PTR_EQ: [&str; 4] = ["alloc", "rc", "Rc", "ptr_eq"];
pub const RECEIVER: [&str; 4] = ["std", "sync", "mpsc", "Receiver"];
pub const REFCELL_REF: [&str; 3] = ["core", "cell", "Ref"];
pub const REFCELL_REFMUT: [&str; 3] = ["core", "cell", "RefMut"];
pub const REGEX_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "unicode", "RegexBuilder", "new"];