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Complete union fields after dot #4198

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Merged
merged 1 commit into from
Apr 28, 2020
Merged

Complete union fields after dot #4198

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27 changes: 15 additions & 12 deletions crates/ra_hir/src/code_model.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1157,18 +1157,21 @@ impl Type {

pub fn fields(&self, db: &dyn HirDatabase) -> Vec<(Field, Type)> {
if let Ty::Apply(a_ty) = &self.ty.value {
if let TypeCtor::Adt(AdtId::StructId(s)) = a_ty.ctor {
let var_def = s.into();
return db
.field_types(var_def)
.iter()
.map(|(local_id, ty)| {
let def = Field { parent: var_def.into(), id: local_id };
let ty = ty.clone().subst(&a_ty.parameters);
(def, self.derived(ty))
})
.collect();
}
let variant_id = match a_ty.ctor {
TypeCtor::Adt(AdtId::StructId(s)) => s.into(),
TypeCtor::Adt(AdtId::UnionId(u)) => u.into(),
_ => return Vec::new(),
};

return db
.field_types(variant_id)
.iter()
.map(|(local_id, ty)| {
let def = Field { parent: variant_id.into(), id: local_id };
let ty = ty.clone().subst(&a_ty.parameters);
(def, self.derived(ty))
})
.collect();
};
Vec::new()
}
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38 changes: 38 additions & 0 deletions crates/ra_ide/src/completion/complete_dot.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -249,6 +249,44 @@ mod tests {
);
}

#[test]
fn test_union_field_completion() {
assert_debug_snapshot!(
do_ref_completion(
r"
union Un {
field: u8,
other: u16,
}

fn foo(u: Un) {
u.<|>
}
",
),
@r###"
[
CompletionItem {
label: "field",
source_range: 140..140,
delete: 140..140,
insert: "field",
kind: Field,
detail: "u8",
},
CompletionItem {
label: "other",
source_range: 140..140,
delete: 140..140,
insert: "other",
kind: Field,
detail: "u16",
},
]
"###
);
}

#[test]
fn test_method_completion() {
assert_debug_snapshot!(
Expand Down