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|
//! FIXME: write short doc here
use ra_ide_db::RootDatabase;
use ra_syntax::{ast, match_ast, AstNode, SyntaxKind::*, SyntaxToken, TokenAtOffset};
use crate::{display::ToNav, FilePosition, NavigationTarget, RangeInfo};
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(expr) => { sema.type_of_expr(&expr)? },
ast::Pat(pat) => { sema.type_of_pat(&pat)? },
_ => { return None },
}
};
Some((ty, node))
})?;
let adt_def = ty.autoderef(db).find_map(|ty| ty.as_adt())?;
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 => 2,
kind if kind.is_trivia() => 0,
_ => 1,
}
}
}
#[cfg(test)]
mod tests {
use crate::mock_analysis::analysis_and_position;
fn check_goto(fixture: &str, expected: &str) {
let (analysis, pos) = analysis_and_position(fixture);
let mut navs = analysis.goto_type_definition(pos).unwrap().unwrap().info;
assert_eq!(navs.len(), 1);
let nav = navs.pop().unwrap();
nav.assert_match(expected);
}
#[test]
fn goto_type_definition_works_simple() {
check_goto(
"
//- /lib.rs
struct Foo;
fn foo() {
let f: Foo;
f<|>
}
",
"Foo STRUCT_DEF FileId(1) [0; 11) [7; 10)",
);
}
#[test]
fn goto_type_definition_works_simple_ref() {
check_goto(
"
//- /lib.rs
struct Foo;
fn foo() {
let f: &Foo;
f<|>
}
",
"Foo STRUCT_DEF FileId(1) [0; 11) [7; 10)",
);
}
#[test]
fn goto_type_definition_works_through_macro() {
check_goto(
"
//- /lib.rs
macro_rules! id {
($($tt:tt)*) => { $($tt)* }
}
struct Foo {}
id! {
fn bar() {
let f<|> = Foo {};
}
}
",
"Foo STRUCT_DEF FileId(1) [52; 65) [59; 62)",
);
}
#[test]
fn goto_type_definition_for_param() {
check_goto(
"
//- /lib.rs
struct Foo;
fn foo(<|>f: Foo) {}
",
"Foo STRUCT_DEF FileId(1) [0; 11) [7; 10)",
);
}
#[test]
fn goto_type_definition_for_tuple_field() {
check_goto(
"
//- /lib.rs
struct Foo;
struct Bar(Foo);
fn foo() {
let bar = Bar(Foo);
bar.<|>0;
}
",
"Foo STRUCT_DEF FileId(1) [0; 11) [7; 10)",
);
}
}
|
