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|
use ra_db::{FileId, Cancelable, SyntaxDatabase};
use ra_syntax::{
TextRange, AstNode, ast, SyntaxKind::{NAME, MODULE},
algo::find_node_at_offset,
};
use crate::{FilePosition, NavigationTarget, db::RootDatabase};
pub(crate) fn goto_definition(
db: &RootDatabase,
position: FilePosition,
) -> Cancelable<Option<Vec<NavigationTarget>>> {
let file = db.source_file(position.file_id);
let syntax = file.syntax();
if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(syntax, position.offset) {
return Ok(Some(reference_definition(db, position.file_id, name_ref)?));
}
if let Some(name) = find_node_at_offset::<ast::Name>(syntax, position.offset) {
return name_definition(db, position.file_id, name);
}
Ok(None)
}
pub(crate) fn reference_definition(
db: &RootDatabase,
file_id: FileId,
name_ref: &ast::NameRef,
) -> Cancelable<Vec<NavigationTarget>> {
if let Some(fn_descr) =
hir::source_binder::function_from_child_node(db, file_id, name_ref.syntax())?
{
let scope = fn_descr.scopes(db)?;
// First try to resolve the symbol locally
if let Some(entry) = scope.resolve_local_name(name_ref) {
let nav = NavigationTarget {
file_id,
name: entry.name().to_string().into(),
range: entry.ptr().range(),
kind: NAME,
ptr: None,
};
return Ok(vec![nav]);
};
}
// Then try module name resolution
if let Some(module) =
hir::source_binder::module_from_child_node(db, file_id, name_ref.syntax())?
{
if let Some(path) = name_ref
.syntax()
.ancestors()
.find_map(ast::Path::cast)
.and_then(hir::Path::from_ast)
{
let resolved = module.resolve_path(db, &path)?;
if let Some(def_id) = resolved.take_types().or(resolved.take_values()) {
if let Some(target) = NavigationTarget::from_def(db, def_id.resolve(db)?)? {
return Ok(vec![target]);
}
}
}
}
// If that fails try the index based approach.
let navs = db
.index_resolve(name_ref)?
.into_iter()
.map(NavigationTarget::from_symbol)
.collect();
Ok(navs)
}
fn name_definition(
db: &RootDatabase,
file_id: FileId,
name: &ast::Name,
) -> Cancelable<Option<Vec<NavigationTarget>>> {
if let Some(module) = name.syntax().parent().and_then(ast::Module::cast) {
if module.has_semi() {
if let Some(child_module) =
hir::source_binder::module_from_declaration(db, file_id, module)?
{
let (file_id, _) = child_module.definition_source(db)?;
let name = match child_module.name(db)? {
Some(name) => name.to_string().into(),
None => "".into(),
};
let nav = NavigationTarget {
file_id,
name,
range: TextRange::offset_len(0.into(), 0.into()),
kind: MODULE,
ptr: None,
};
return Ok(Some(vec![nav]));
}
}
}
Ok(None)
}
#[cfg(test)]
mod tests {
use test_utils::assert_eq_dbg;
use crate::mock_analysis::analysis_and_position;
#[test]
fn goto_definition_works_in_items() {
let (analysis, pos) = analysis_and_position(
"
//- /lib.rs
struct Foo;
enum E { X(Foo<|>) }
",
);
let symbols = analysis.goto_definition(pos).unwrap().unwrap();
assert_eq_dbg(
r#"[NavigationTarget { file_id: FileId(1), name: "Foo",
kind: STRUCT_DEF, range: [0; 11),
ptr: Some(LocalSyntaxPtr { range: [0; 11), kind: STRUCT_DEF }) }]"#,
&symbols,
);
}
#[test]
fn goto_definition_resolves_correct_name() {
let (analysis, pos) = analysis_and_position(
"
//- /lib.rs
use a::Foo;
mod a;
mod b;
enum E { X(Foo<|>) }
//- /a.rs
struct Foo;
//- /b.rs
struct Foo;
",
);
let symbols = analysis.goto_definition(pos).unwrap().unwrap();
assert_eq_dbg(
r#"[NavigationTarget { file_id: FileId(2), name: "Foo",
kind: STRUCT_DEF, range: [0; 11),
ptr: Some(LocalSyntaxPtr { range: [0; 11), kind: STRUCT_DEF }) }]"#,
&symbols,
);
}
#[test]
fn goto_definition_works_for_module_declaration() {
let (analysis, pos) = analysis_and_position(
"
//- /lib.rs
mod <|>foo;
//- /foo.rs
// empty
",
);
let symbols = analysis.goto_definition(pos).unwrap().unwrap();
assert_eq_dbg(
r#"[NavigationTarget { file_id: FileId(2), name: "foo", kind: MODULE, range: [0; 0), ptr: None }]"#,
&symbols,
);
let (analysis, pos) = analysis_and_position(
"
//- /lib.rs
mod <|>foo;
//- /foo/mod.rs
// empty
",
);
let symbols = analysis.goto_definition(pos).unwrap().unwrap();
assert_eq_dbg(
r#"[NavigationTarget { file_id: FileId(2), name: "foo", kind: MODULE, range: [0; 0), ptr: None }]"#,
&symbols,
);
}
}
|
