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|
use ra_db::{FileId, SourceDatabase};
use ra_syntax::{
AstNode, ast,
algo::find_node_at_offset,
};
use test_utils::tested_by;
use crate::{FilePosition, NavigationTarget, db::RootDatabase, RangeInfo};
pub(crate) fn goto_definition(
db: &RootDatabase,
position: FilePosition,
) -> Option<RangeInfo<Vec<NavigationTarget>>> {
let file = db.parse(position.file_id);
let syntax = file.syntax();
if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(syntax, position.offset) {
let navs = reference_definition(db, position.file_id, name_ref).to_vec();
return Some(RangeInfo::new(name_ref.syntax().range(), navs.to_vec()));
}
if let Some(name) = find_node_at_offset::<ast::Name>(syntax, position.offset) {
let navs = name_definition(db, position.file_id, name)?;
return Some(RangeInfo::new(name.syntax().range(), navs));
}
None
}
pub(crate) enum ReferenceResult {
Exact(NavigationTarget),
Approximate(Vec<NavigationTarget>),
}
impl ReferenceResult {
fn to_vec(self) -> Vec<NavigationTarget> {
use self::ReferenceResult::*;
match self {
Exact(target) => vec![target],
Approximate(vec) => vec,
}
}
}
pub(crate) fn reference_definition(
db: &RootDatabase,
file_id: FileId,
name_ref: &ast::NameRef,
) -> ReferenceResult {
use self::ReferenceResult::*;
if let Some(function) =
hir::source_binder::function_from_child_node(db, file_id, name_ref.syntax())
{
let scope = function.scopes(db);
// First try to resolve the symbol locally
if let Some(entry) = scope.resolve_local_name(name_ref) {
let nav = NavigationTarget::from_scope_entry(file_id, &entry);
return Exact(nav);
};
// Next check if it is a method
if let Some(method_call) = name_ref
.syntax()
.parent()
.and_then(ast::MethodCallExpr::cast)
{
tested_by!(goto_definition_works_for_methods);
let infer_result = function.infer(db);
let syntax_mapping = function.body_syntax_mapping(db);
let expr = ast::Expr::cast(method_call.syntax()).unwrap();
if let Some(func) = syntax_mapping
.node_expr(expr)
.and_then(|it| infer_result.method_resolution(it))
{
return Exact(NavigationTarget::from_function(db, func));
};
}
// It could also be a field access
if let Some(field_expr) = name_ref.syntax().parent().and_then(ast::FieldExpr::cast) {
tested_by!(goto_definition_works_for_fields);
let infer_result = function.infer(db);
let syntax_mapping = function.body_syntax_mapping(db);
let expr = ast::Expr::cast(field_expr.syntax()).unwrap();
if let Some(field) = syntax_mapping
.node_expr(expr)
.and_then(|it| infer_result.field_resolution(it))
{
return Exact(NavigationTarget::from_field(db, field));
};
}
}
// 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()) {
return Exact(NavigationTarget::from_def(db, def_id));
}
}
}
// If that fails try the index based approach.
let navs = db
.index_resolve(name_ref)
.into_iter()
.map(NavigationTarget::from_symbol)
.collect();
Approximate(navs)
}
fn name_definition(
db: &RootDatabase,
file_id: FileId,
name: &ast::Name,
) -> 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 nav = NavigationTarget::from_module(db, child_module);
return Some(vec![nav]);
}
}
}
None
}
#[cfg(test)]
mod tests {
use test_utils::covers;
use crate::mock_analysis::analysis_and_position;
fn check_goto(fixuture: &str, expected: &str) {
let (analysis, pos) = analysis_and_position(fixuture);
let mut navs = analysis.goto_definition(pos).unwrap().unwrap().info;
assert_eq!(navs.len(), 1);
let nav = navs.pop().unwrap();
nav.assert_match(expected);
}
#[test]
fn goto_definition_works_in_items() {
check_goto(
"
//- /lib.rs
struct Foo;
enum E { X(Foo<|>) }
",
"Foo STRUCT_DEF FileId(1) [0; 11) [7; 10)",
);
}
#[test]
fn goto_definition_resolves_correct_name() {
check_goto(
"
//- /lib.rs
use a::Foo;
mod a;
mod b;
enum E { X(Foo<|>) }
//- /a.rs
struct Foo;
//- /b.rs
struct Foo;
",
"Foo STRUCT_DEF FileId(2) [0; 11) [7; 10)",
);
}
#[test]
fn goto_definition_works_for_module_declaration() {
check_goto(
"
//- /lib.rs
mod <|>foo;
//- /foo.rs
// empty
",
"foo SOURCE_FILE FileId(2) [0; 10)",
);
check_goto(
"
//- /lib.rs
mod <|>foo;
//- /foo/mod.rs
// empty
",
"foo SOURCE_FILE FileId(2) [0; 10)",
);
}
#[test]
fn goto_definition_works_for_methods() {
covers!(goto_definition_works_for_methods);
check_goto(
"
//- /lib.rs
struct Foo;
impl Foo {
fn frobnicate(&self) { }
}
fn bar(foo: &Foo) {
foo.frobnicate<|>();
}
",
"frobnicate FN_DEF FileId(1) [27; 52) [30; 40)",
);
}
#[test]
fn goto_definition_works_for_fields() {
covers!(goto_definition_works_for_fields);
check_goto(
"
//- /lib.rs
struct Foo {
spam: u32,
}
fn bar(foo: &Foo) {
foo.spam<|>;
}
",
"spam NAMED_FIELD_DEF FileId(1) [17; 26) [17; 21)",
);
}
}
|
