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Simplify redundant coercion

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Shoyu Vanilla 2024-02-05 10:35:12 +09:00 committed by GitHub
parent 97ecfe4fab
commit f0428e57ea
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1 changed files with 8 additions and 30 deletions
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38
crates/ide-assists/src/utils.rs
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@ -3,7 +3,7 @@
use std::ops;
pub(crate) use gen_trait_fn_body::gen_trait_fn_body;
use hir::{db::HirDatabase, known, HasAttrs as HirHasAttrs, HirDisplay, InFile, Semantics};
use hir::{db::HirDatabase, HasAttrs as HirHasAttrs, HirDisplay, InFile, Semantics};
use ide_db::{
famous_defs::FamousDefs, path_transform::PathTransform,
syntax_helpers::insert_whitespace_into_node::insert_ws_into, RootDatabase, SnippetCap,
@ -685,32 +685,10 @@ pub(crate) fn convert_reference_type(
.map(|(conversion, impls_deref)| ReferenceConversion { ty, conversion, impls_deref })
}
fn impls_deref_for_target(
ty: &hir::Type,
target: hir::Type,
db: &dyn HirDatabase,
famous_defs: &FamousDefs<'_, '_>,
) -> bool {
if let Some(deref_trait) = famous_defs.core_ops_Deref() {
if ty.impls_trait(db, deref_trait, &[]) {
let assoc_type_item = deref_trait.items(db).into_iter().find_map(|item| match item {
hir::AssocItem::TypeAlias(alias) if alias.name(db) == known::Target => Some(alias),
_ => None,
});
if let Some(assoc_type_item) = assoc_type_item {
matches!(
ty.normalize_trait_assoc_type(db, &[], assoc_type_item),
Some(ty) if ty.could_coerce_to(db, &target),
)
} else {
false
}
} else {
false
}
} else {
false
}
fn could_deref_to_target(ty: &hir::Type, target: &hir::Type, db: &dyn HirDatabase) -> bool {
let ty_ref = hir:Type::reference(ty, hir::Mutability::Shared);
let target_ref = hir:Type::reference(target, hir::Mutability::Shared);
ty_ref.could_coerece_to(db, &target_ref)
}
fn handle_copy(ty: &hir::Type, db: &dyn HirDatabase) -> Option<(ReferenceConversionType, bool)> {
@ -726,7 +704,7 @@ fn handle_as_ref_str(
ty.impls_trait(db, famous_defs.core_convert_AsRef()?, &[str_type.clone()]).then_some((
ReferenceConversionType::AsRefStr,
impls_deref_for_target(ty, str_type, db, famous_defs),
could_deref_to_target(ty, &str_type, db),
))
}
@ -740,7 +718,7 @@ fn handle_as_ref_slice(
ty.impls_trait(db, famous_defs.core_convert_AsRef()?, &[slice_type.clone()]).then_some((
ReferenceConversionType::AsRefSlice,
impls_deref_for_target(ty, slice_type, db, famous_defs),
could_deref_to_target(ty, &slice_type, db),
))
}
@ -753,7 +731,7 @@ fn handle_dereferenced(
ty.impls_trait(db, famous_defs.core_convert_AsRef()?, &[type_argument.clone()]).then_some((
ReferenceConversionType::Dereferenced,
impls_deref_for_target(ty, type_argument, db, famous_defs),
could_deref_to_target(ty, &type_argument, db),
))
}