1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
use ra_db::{FileId, SyntaxDatabase};
use ra_syntax::{
AstNode, ast,
algo::find_node_at_offset,
};
use crate::{FilePosition, NavigationTarget, db::RootDatabase, RangeInfo};
pub(crate) fn goto_definition(
db: &RootDatabase,
position: FilePosition,
) -> Option<RangeInfo<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) {
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)
{
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(def_id) = syntax_mapping
.node_expr(expr)
.and_then(|it| infer_result.method_resolution(it))
{
if let Some(target) = NavigationTarget::from_def(db, def_id.resolve(db)) {
return Exact(target);
}
};
}
}
// 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 Exact(target);
}
}
}
}
// 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 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() {
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)",
);
check_goto(
"
//- /lib.rs
mod <|>foo;
//- /foo/mod.rs
// empty
",
"foo SOURCE_FILE FileId(2) [0; 10)",
);
}
}
|
