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|
use hir::{AsAssocItem, Semantics};
use ide_db::{
defs::{Definition, NameClass, NameRefClass},
RootDatabase,
};
use syntax::{ast, match_ast, AstNode, SyntaxKind::*, T};
use crate::{
goto_definition::goto_definition, navigation_target::TryToNav, FilePosition, NavigationTarget,
RangeInfo,
};
// Feature: Go to Declaration
//
// Navigates to the declaration of an identifier.
//
// This is the same as `Go to Definition` with the following exceptions:
// - outline modules will navigate to the `mod name;` item declaration
// - trait assoc items will navigate to the assoc item of the trait declaration opposed to the trait impl
// - fields in patterns will navigate to the field declaration of the struct, union or variant
pub(crate) fn goto_declaration(
db: &RootDatabase,
position: FilePosition,
) -> Option<RangeInfo<Vec<NavigationTarget>>> {
let sema = Semantics::new(db);
let file = sema.parse(position.file_id).syntax().clone();
let original_token = file
.token_at_offset(position.offset)
.find(|it| matches!(it.kind(), IDENT | T![self] | T![super] | T![crate] | T![Self]))?;
let range = original_token.text_range();
let info: Vec<NavigationTarget> = sema
.descend_into_macros(original_token)
.iter()
.filter_map(|token| {
let parent = token.parent()?;
let def = match_ast! {
match parent {
ast::NameRef(name_ref) => match NameRefClass::classify(&sema, &name_ref)? {
NameRefClass::Definition(it) => Some(it),
NameRefClass::FieldShorthand { field_ref, .. } => return field_ref.try_to_nav(db),
},
ast::Name(name) => match NameClass::classify(&sema, &name)? {
NameClass::Definition(it) | NameClass::ConstReference(it) => Some(it),
NameClass::PatFieldShorthand { field_ref, .. } => return field_ref.try_to_nav(db),
},
_ => None
}
};
let assoc = match def? {
Definition::Module(module) => {
return Some(NavigationTarget::from_module_to_decl(db, module))
}
Definition::Const(c) => c.as_assoc_item(db),
Definition::TypeAlias(ta) => ta.as_assoc_item(db),
Definition::Function(f) => f.as_assoc_item(db),
_ => None,
}?;
let trait_ = assoc.containing_trait_impl(db)?;
let name = Some(assoc.name(db)?);
let item = trait_.items(db).into_iter().find(|it| it.name(db) == name)?;
item.try_to_nav(db)
})
.collect();
if info.is_empty() {
goto_definition(db, position)
} else {
Some(RangeInfo::new(range, info))
}
}
#[cfg(test)]
mod tests {
use ide_db::base_db::FileRange;
use itertools::Itertools;
use crate::fixture;
fn check(ra_fixture: &str) {
let (analysis, position, expected) = fixture::annotations(ra_fixture);
let navs = analysis
.goto_declaration(position)
.unwrap()
.expect("no declaration or definition found")
.info;
if navs.is_empty() {
panic!("unresolved reference")
}
let cmp = |&FileRange { file_id, range }: &_| (file_id, range.start());
let navs = navs
.into_iter()
.map(|nav| FileRange { file_id: nav.file_id, range: nav.focus_or_full_range() })
.sorted_by_key(cmp)
.collect::<Vec<_>>();
let expected = expected
.into_iter()
.map(|(FileRange { file_id, range }, _)| FileRange { file_id, range })
.sorted_by_key(cmp)
.collect::<Vec<_>>();
assert_eq!(expected, navs);
}
#[test]
fn goto_decl_module_outline() {
check(
r#"
//- /main.rs
mod foo;
// ^^^
//- /foo.rs
use self$0;
"#,
)
}
#[test]
fn goto_decl_module_inline() {
check(
r#"
mod foo {
// ^^^
use self$0;
}
"#,
)
}
#[test]
fn goto_decl_goto_def_fallback() {
check(
r#"
struct Foo;
// ^^^
impl Foo$0 {}
"#,
);
}
#[test]
fn goto_decl_assoc_item_no_impl_item() {
check(
r#"
trait Trait {
const C: () = ();
// ^
}
impl Trait for () {}
fn main() {
<()>::C$0;
}
"#,
);
}
#[test]
fn goto_decl_assoc_item() {
check(
r#"
trait Trait {
const C: () = ();
// ^
}
impl Trait for () {
const C: () = ();
}
fn main() {
<()>::C$0;
}
"#,
);
check(
r#"
trait Trait {
const C: () = ();
// ^
}
impl Trait for () {
const C$0: () = ();
}
"#,
);
}
#[test]
fn goto_decl_field_pat_shorthand() {
check(
r#"
struct Foo { field: u32 }
//^^^^^
fn main() {
let Foo { field$0 };
}
"#,
);
}
#[test]
fn goto_decl_constructor_shorthand() {
check(
r#"
struct Foo { field: u32 }
//^^^^^
fn main() {
let field = 0;
Foo { field$0 };
}
"#,
);
}
}
|
