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|
use ide_db::RootDatabase;
use syntax::{ast, match_ast, AstNode, SyntaxKind::*, SyntaxToken, TokenAtOffset, T};
use crate::{display::ToNav, FilePosition, NavigationTarget, RangeInfo};
// Feature: Go to Type Definition
//
// Navigates to the type of an identifier.
//
// |===
// | Editor | Action Name
//
// | VS Code | **Go to Type Definition*
// |===
pub(crate) fn goto_type_definition(
db: &RootDatabase,
position: FilePosition,
) -> Option<RangeInfo<Vec<NavigationTarget>>> {
let sema = hir::Semantics::new(db);
let file: ast::SourceFile = sema.parse(position.file_id);
let token: SyntaxToken = pick_best(file.syntax().token_at_offset(position.offset))?;
let token: SyntaxToken = sema.descend_into_macros(token);
let (ty, node) = sema.ancestors_with_macros(token.parent()).find_map(|node| {
let ty = match_ast! {
match node {
ast::Expr(it) => sema.type_of_expr(&it)?,
ast::Pat(it) => sema.type_of_pat(&it)?,
ast::SelfParam(it) => sema.type_of_self(&it)?,
_ => return None,
}
};
Some((ty, node))
})?;
let adt_def = ty.autoderef(db).filter_map(|ty| ty.as_adt()).last()?;
let nav = adt_def.to_nav(db);
Some(RangeInfo::new(node.text_range(), vec![nav]))
}
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 | T![self] => 2,
kind if kind.is_trivia() => 0,
_ => 1,
}
}
}
#[cfg(test)]
mod tests {
use base_db::FileRange;
use crate::mock_analysis::analysis_and_annotations;
fn check(ra_fixture: &str) {
let (analysis, position, mut annotations) = analysis_and_annotations(ra_fixture);
let (expected, data) = annotations.pop().unwrap();
assert!(data.is_empty());
let mut navs = analysis.goto_type_definition(position).unwrap().unwrap().info;
assert_eq!(navs.len(), 1);
let nav = navs.pop().unwrap();
assert_eq!(expected, FileRange { file_id: nav.file_id, range: nav.focus_or_full_range() });
}
#[test]
fn goto_type_definition_works_simple() {
check(
r#"
struct Foo;
//^^^
fn foo() {
let f: Foo; f<|>
}
"#,
);
}
#[test]
fn goto_type_definition_works_simple_ref() {
check(
r#"
struct Foo;
//^^^
fn foo() {
let f: &Foo; f<|>
}
"#,
);
}
#[test]
fn goto_type_definition_works_through_macro() {
check(
r#"
macro_rules! id { ($($tt:tt)*) => { $($tt)* } }
struct Foo {}
//^^^
id! {
fn bar() { let f<|> = Foo {}; }
}
"#,
);
}
#[test]
fn goto_type_definition_for_param() {
check(
r#"
struct Foo;
//^^^
fn foo(<|>f: Foo) {}
"#,
);
}
#[test]
fn goto_type_definition_for_tuple_field() {
check(
r#"
struct Foo;
//^^^
struct Bar(Foo);
fn foo() {
let bar = Bar(Foo);
bar.<|>0;
}
"#,
);
}
#[test]
fn goto_def_for_self_param() {
check(
r#"
struct Foo;
//^^^
impl Foo {
fn f(&self<|>) {}
}
"#,
)
}
}
|
