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Factor out get_qpath_generics

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This commit is contained in:
Cameron Steffen 2022-01-17 13:39:45 -06:00
parent 20781f195d
commit 145d7fc529
1 changed files with 10 additions and 20 deletions
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30
clippy_utils/src/lib.rs
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@ -77,9 +77,9 @@ use rustc_hir::itemlikevisit::ItemLikeVisitor;
use rustc_hir::LangItem::{OptionNone, ResultErr, ResultOk};
use rustc_hir::{
def, lang_items, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Constness, Destination, Expr,
ExprKind, FnDecl, ForeignItem, GenericArgs, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem,
Local, MatchSource, Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind,
Target, TraitItem, TraitItemKind, TraitRef, TyKind, UnOp,
ExprKind, FnDecl, ForeignItem, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem, Local,
MatchSource, Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, Target,
TraitItem, TraitItemKind, TraitRef, TyKind, UnOp,
};
use rustc_lint::{LateContext, Level, Lint, LintContext};
use rustc_middle::hir::place::PlaceBase;
@ -360,24 +360,14 @@ pub fn last_path_segment<'tcx>(path: &QPath<'tcx>) -> &'tcx PathSegment<'tcx> {
}
}
pub fn get_qpath_generics<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx GenericArgs<'tcx>> {
match path {
QPath::Resolved(_, p) => p.segments.last().and_then(|s| s.args),
QPath::TypeRelative(_, s) => s.args,
QPath::LangItem(..) => None,
}
}
pub fn qpath_generic_tys<'tcx>(path: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
get_qpath_generics(path)
.map_or([].as_ref(), |a| a.args)
pub fn qpath_generic_tys<'tcx>(qpath: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
last_path_segment(qpath)
.args
.map_or(&[][..], |a| a.args)
.iter()
.filter_map(|a| {
if let hir::GenericArg::Type(ty) = a {
Some(ty)
} else {
None
}
.filter_map(|a| match a {
hir::GenericArg::Type(ty) => Some(ty),
_ => None,
})
}