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Show lifetimes and labels on hover

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This commit is contained in:
Lukas Wirth 2021-01-01 15:07:41 +01:00
parent 0e5fe47153
commit bbc0b41c37
1 changed files with 43 additions and 7 deletions
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50
crates/ide/src/hover.rs
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@ -109,6 +109,8 @@ pub(crate) fn hover(
match node {
ast::Name(name) => NameClass::classify(&sema, &name).and_then(|d| d.defined(sema.db)),
ast::NameRef(name_ref) => NameRefClass::classify(&sema, &name_ref).map(|d| d.referenced(sema.db)),
ast::Lifetime(lifetime) => NameClass::classify_lifetime(&sema, &lifetime)
.map_or_else(|| NameRefClass::classify_lifetime(&sema, &lifetime).map(|d| d.referenced(sema.db)), |d| d.defined(sema.db)),
_ => None,
}
};
@ -360,9 +362,9 @@ fn hover_for_definition(db: &RootDatabase, def: Definition) -> Option<Markup> {
ModuleDef::Static(it) => from_def_source(db, it, mod_path),
ModuleDef::Trait(it) => from_def_source(db, it, mod_path),
ModuleDef::TypeAlias(it) => from_def_source(db, it, mod_path),
ModuleDef::BuiltinType(it) => return Some(it.to_string().into()),
ModuleDef::BuiltinType(it) => Some(Markup::fenced_block(&it)),
},
Definition::Local(it) => return Some(Markup::fenced_block(&it.ty(db).display(db))),
Definition::Local(it) => Some(Markup::fenced_block(&it.ty(db).display(db))),
Definition::SelfType(impl_def) => {
impl_def.target_ty(db).as_adt().and_then(|adt| match adt {
Adt::Struct(it) => from_def_source(db, it, mod_path),
@ -370,10 +372,9 @@ fn hover_for_definition(db: &RootDatabase, def: Definition) -> Option<Markup> {
Adt::Enum(it) => from_def_source(db, it, mod_path),
})
}
Definition::TypeParam(_)
| Definition::LifetimeParam(_)
| Definition::ConstParam(_)
| Definition::Label(_) => {
Definition::Label(it) => Some(Markup::fenced_block(&it.name(db))),
Definition::LifetimeParam(it) => Some(Markup::fenced_block(&it.name(db))),
Definition::TypeParam(_) | Definition::ConstParam(_) => {
// FIXME: Hover for generic param
None
}
@ -406,7 +407,7 @@ fn pick_best(tokens: TokenAtOffset<SyntaxToken>) -> Option<SyntaxToken> {
return tokens.max_by_key(priority);
fn priority(n: &SyntaxToken) -> usize {
match n.kind() {
IDENT | INT_NUMBER => 3,
IDENT | INT_NUMBER | LIFETIME_IDENT => 3,
T!['('] | T![')'] => 2,
kind if kind.is_trivia() => 0,
_ => 1,
@ -1172,7 +1173,10 @@ fn f() { fo<|>o!(); }
r#"struct TS(String, i32<|>);"#,
expect![[r#"
*i32*
```rust
i32
```
"#]],
)
}
@ -3224,4 +3228,36 @@ fn no_hover() {
"#,
);
}
#[test]
fn hover_label() {
check(
r#"
fn foo() {
'label<|>: loop {}
}
"#,
expect![[r#"
*'label*
```rust
'label
```
"#]],
);
}
#[test]
fn hover_lifetime() {
check(
r#"fn foo<'lifetime>(_: &'lifetime<|> ()) {}"#,
expect![[r#"
*'lifetime*
```rust
'lifetime
```
"#]],
);
}
}