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
|
/// Lookup hir elements using positions in the source code. This is a lossy
/// transformation: in general, a single source might correspond to several
/// modules, functions, etc, due to macros, cfgs and `#[path=]` attributes on
/// modules.
///
/// So, this modules should not be used during hir construction, it exists
/// purely for "IDE needs".
use ra_db::{FileId, FilePosition};
use ra_syntax::{
SmolStr, TextRange, SyntaxNode,
ast::{self, AstNode, NameOwner},
algo::find_node_at_offset,
};
use crate::{
HirDatabase, Function, SourceItemId,
DefKind, DefLoc, AsName, Module,
};
/// Locates the module by `FileId`. Picks topmost module in the file.
pub fn module_from_file_id(db: &impl HirDatabase, file_id: FileId) -> Option<Module> {
let module_source = SourceItemId {
file_id: file_id.into(),
item_id: None,
};
module_from_source(db, module_source)
}
/// Locates the child module by `mod child;` declaration.
pub fn module_from_declaration(
db: &impl HirDatabase,
file_id: FileId,
decl: &ast::Module,
) -> Option<Module> {
let parent_module = module_from_file_id(db, file_id);
let child_name = decl.name();
match (parent_module, child_name) {
(Some(parent_module), Some(child_name)) => {
if let Some(child) = parent_module.child(db, &child_name.as_name()) {
return Some(child);
}
}
_ => (),
}
None
}
/// Locates the module by position in the source code.
pub fn module_from_position(db: &impl HirDatabase, position: FilePosition) -> Option<Module> {
let file = db.source_file(position.file_id);
match find_node_at_offset::<ast::Module>(file.syntax(), position.offset) {
Some(m) if !m.has_semi() => module_from_inline(db, position.file_id.into(), m),
_ => module_from_file_id(db, position.file_id.into()),
}
}
fn module_from_inline(
db: &impl HirDatabase,
file_id: FileId,
module: &ast::Module,
) -> Option<Module> {
assert!(!module.has_semi());
let file_id = file_id.into();
let file_items = db.file_items(file_id);
let item_id = file_items.id_of(file_id, module.syntax());
let source = SourceItemId {
file_id,
item_id: Some(item_id),
};
module_from_source(db, source)
}
/// Locates the module by child syntax element within the module
pub fn module_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
child: &SyntaxNode,
) -> Option<Module> {
if let Some(m) = child
.ancestors()
.filter_map(ast::Module::cast)
.find(|it| !it.has_semi())
{
module_from_inline(db, file_id.into(), m)
} else {
module_from_file_id(db, file_id.into())
}
}
fn module_from_source(db: &impl HirDatabase, source: SourceItemId) -> Option<Module> {
let source_root_id = db.file_source_root(source.file_id.as_original_file());
let module_tree = db.module_tree(source_root_id);
let module_id = module_tree.find_module_by_source(source)?;
Some(Module::from_module_id(db, source_root_id, module_id))
}
pub fn function_from_position(db: &impl HirDatabase, position: FilePosition) -> Option<Function> {
let file = db.source_file(position.file_id);
let fn_def = find_node_at_offset::<ast::FnDef>(file.syntax(), position.offset)?;
function_from_source(db, position.file_id, fn_def)
}
pub fn function_from_source(
db: &impl HirDatabase,
file_id: FileId,
fn_def: &ast::FnDef,
) -> Option<Function> {
let module = module_from_child_node(db, file_id, fn_def.syntax())?;
let res = function_from_module(db, &module, fn_def);
Some(res)
}
pub fn function_from_module(
db: &impl HirDatabase,
module: &Module,
fn_def: &ast::FnDef,
) -> Function {
let loc = module.def_id.loc(db);
let file_id = loc.source_item_id.file_id;
let file_items = db.file_items(file_id);
let item_id = file_items.id_of(file_id, fn_def.syntax());
let source_item_id = SourceItemId {
file_id,
item_id: Some(item_id),
};
let def_loc = DefLoc {
kind: DefKind::Function,
source_root_id: loc.source_root_id,
module_id: loc.module_id,
source_item_id,
};
Function::new(def_loc.id(db))
}
pub fn function_from_child_node(
db: &impl HirDatabase,
file_id: FileId,
node: &SyntaxNode,
) -> Option<Function> {
let fn_def = node.ancestors().find_map(ast::FnDef::cast)?;
function_from_source(db, file_id, fn_def)
}
pub fn macro_symbols(db: &impl HirDatabase, file_id: FileId) -> Vec<(SmolStr, TextRange)> {
let module = match module_from_file_id(db, file_id) {
Some(it) => it,
None => return Vec::new(),
};
let loc = module.def_id.loc(db);
let items = db.input_module_items(loc.source_root_id, loc.module_id);
let mut res = Vec::new();
for macro_call_id in items
.items
.iter()
.filter_map(|it| it.id.file_id.as_macro_call_id())
{
if let Some(exp) = db.expand_macro_invocation(macro_call_id) {
let loc = macro_call_id.loc(db);
let syntax = db.file_item(loc.source_item_id);
let macro_call = ast::MacroCall::cast(&syntax).unwrap();
let off = macro_call.token_tree().unwrap().syntax().range().start();
let file = exp.file();
for trait_def in file.syntax().descendants().filter_map(ast::TraitDef::cast) {
if let Some(name) = trait_def.name() {
let dst_range = name.syntax().range();
if let Some(src_range) = exp.map_range_back(dst_range) {
res.push((name.text().clone(), src_range + off))
}
}
}
}
}
res
}
|
