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
|
use crate::TextRange;
use ra_syntax::{
algo::visit::{visitor, Visitor},
ast::{self, AttrsOwner, NameOwner, TypeParamsOwner, TypeAscriptionOwner},
AstNode, SourceFile, SyntaxKind, SyntaxNode, WalkEvent,
};
#[derive(Debug, Clone)]
pub struct StructureNode {
pub parent: Option<usize>,
pub label: String,
pub navigation_range: TextRange,
pub node_range: TextRange,
pub kind: SyntaxKind,
pub detail: Option<String>,
pub deprecated: bool,
}
pub fn file_structure(file: &SourceFile) -> Vec<StructureNode> {
let mut res = Vec::new();
let mut stack = Vec::new();
for event in file.syntax().preorder() {
match event {
WalkEvent::Enter(node) => {
if let Some(mut symbol) = structure_node(node) {
symbol.parent = stack.last().map(|&n| n);
stack.push(res.len());
res.push(symbol);
}
}
WalkEvent::Leave(node) => {
if structure_node(node).is_some() {
stack.pop().unwrap();
}
}
}
}
res
}
fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
fn decl<N: NameOwner + AttrsOwner>(node: &N) -> Option<StructureNode> {
decl_with_detail(node, None)
}
fn decl_with_ascription<N: NameOwner + AttrsOwner + TypeAscriptionOwner>(
node: &N,
) -> Option<StructureNode> {
decl_with_type_ref(node, node.ascribed_type())
}
fn decl_with_type_ref<N: NameOwner + AttrsOwner>(
node: &N,
type_ref: Option<&ast::TypeRef>,
) -> Option<StructureNode> {
let detail = type_ref.map(|type_ref| {
let mut detail = String::new();
collapse_ws(type_ref.syntax(), &mut detail);
detail
});
decl_with_detail(node, detail)
}
fn decl_with_detail<N: NameOwner + AttrsOwner>(
node: &N,
detail: Option<String>,
) -> Option<StructureNode> {
let name = node.name()?;
Some(StructureNode {
parent: None,
label: name.text().to_string(),
navigation_range: name.syntax().range(),
node_range: node.syntax().range(),
kind: node.syntax().kind(),
detail,
deprecated: node.attrs().filter_map(|x| x.as_named()).any(|x| x == "deprecated"),
})
}
fn collapse_ws(node: &SyntaxNode, output: &mut String) {
let mut can_insert_ws = false;
for line in node.text().chunks().flat_map(|chunk| chunk.lines()) {
let line = line.trim();
if line.is_empty() {
if can_insert_ws {
output.push_str(" ");
can_insert_ws = false;
}
} else {
output.push_str(line);
can_insert_ws = true;
}
}
}
visitor()
.visit(|fn_def: &ast::FnDef| {
let mut detail = String::from("fn");
if let Some(type_param_list) = fn_def.type_param_list() {
collapse_ws(type_param_list.syntax(), &mut detail);
}
if let Some(param_list) = fn_def.param_list() {
collapse_ws(param_list.syntax(), &mut detail);
}
if let Some(ret_type) = fn_def.ret_type() {
detail.push_str(" ");
collapse_ws(ret_type.syntax(), &mut detail);
}
decl_with_detail(fn_def, Some(detail))
})
.visit(decl::<ast::StructDef>)
.visit(decl::<ast::EnumDef>)
.visit(decl::<ast::EnumVariant>)
.visit(decl::<ast::TraitDef>)
.visit(decl::<ast::Module>)
.visit(|td: &ast::TypeAliasDef| decl_with_type_ref(td, td.type_ref()))
.visit(decl_with_ascription::<ast::NamedFieldDef>)
.visit(decl_with_ascription::<ast::ConstDef>)
.visit(decl_with_ascription::<ast::StaticDef>)
.visit(|im: &ast::ImplBlock| {
let target_type = im.target_type()?;
let target_trait = im.target_trait();
let label = match target_trait {
None => format!("impl {}", target_type.syntax().text()),
Some(t) => {
format!("impl {} for {}", t.syntax().text(), target_type.syntax().text(),)
}
};
let node = StructureNode {
parent: None,
label,
navigation_range: target_type.syntax().range(),
node_range: im.syntax().range(),
kind: im.syntax().kind(),
detail: None,
deprecated: false,
};
Some(node)
})
.accept(node)?
}
#[cfg(test)]
mod tests {
use super::*;
use insta::assert_debug_snapshot_matches;
#[test]
fn test_file_structure() {
let file = SourceFile::parse(
r#"
struct Foo {
x: i32
}
mod m {
fn bar1() {}
fn bar2<T>(t: T) -> T {}
fn bar3<A,
B>(a: A,
b: B) -> Vec<
u32
> {}
}
enum E { X, Y(i32) }
type T = ();
static S: i32 = 92;
const C: i32 = 92;
impl E {}
impl fmt::Debug for E {}
#[deprecated]
fn obsolete() {}
#[deprecated(note = "for awhile")]
fn very_obsolete() {}
"#,
)
.ok()
.unwrap();
let structure = file_structure(&file);
assert_debug_snapshot_matches!("file_structure", structure);
}
}
|
