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
|
//! Abstract Syntax Tree, layered on top of untyped `SyntaxNode`s
mod generated;
mod traits;
mod tokens;
mod extensions;
mod expr_extensions;
use std::marker::PhantomData;
use crate::{
syntax_node::{SyntaxNode, SyntaxNodeChildren, SyntaxToken},
SmolStr, SyntaxKind,
};
pub use self::{
expr_extensions::{ArrayExprKind, BinOp, ElseBranch, LiteralKind, PrefixOp},
extensions::{FieldKind, PathSegmentKind, SelfParamKind, StructKind},
generated::*,
tokens::*,
traits::*,
};
/// The main trait to go from untyped `SyntaxNode` to a typed ast. The
/// conversion itself has zero runtime cost: ast and syntax nodes have exactly
/// the same representation: a pointer to the tree root and a pointer to the
/// node itself.
pub trait AstNode: Clone {
fn can_cast(kind: SyntaxKind) -> bool;
fn cast(syntax: SyntaxNode) -> Option<Self>
where
Self: Sized;
fn syntax(&self) -> &SyntaxNode;
}
/// Like `AstNode`, but wraps tokens rather than interior nodes.
pub trait AstToken {
fn cast(token: SyntaxToken) -> Option<Self>
where
Self: Sized;
fn syntax(&self) -> &SyntaxToken;
fn text(&self) -> &SmolStr {
self.syntax().text()
}
}
/// An iterator over `SyntaxNode` children of a particular AST type.
#[derive(Debug)]
pub struct AstChildren<N> {
inner: SyntaxNodeChildren,
ph: PhantomData<N>,
}
impl<N> AstChildren<N> {
fn new(parent: &SyntaxNode) -> Self {
AstChildren { inner: parent.children(), ph: PhantomData }
}
}
impl<N: AstNode> Iterator for AstChildren<N> {
type Item = N;
fn next(&mut self) -> Option<N> {
self.inner.by_ref().find_map(N::cast)
}
}
fn child_opt<P: AstNode + ?Sized, C: AstNode>(parent: &P) -> Option<C> {
children(parent).next()
}
fn children<P: AstNode + ?Sized, C: AstNode>(parent: &P) -> AstChildren<C> {
AstChildren::new(parent.syntax())
}
#[test]
fn test_doc_comment_none() {
let file = SourceFile::parse(
r#"
// non-doc
mod foo {}
"#,
)
.ok()
.unwrap();
let module = file.syntax().descendants().find_map(Module::cast).unwrap();
assert!(module.doc_comment_text().is_none());
}
#[test]
fn test_doc_comment_of_items() {
let file = SourceFile::parse(
r#"
//! doc
// non-doc
mod foo {}
"#,
)
.ok()
.unwrap();
let module = file.syntax().descendants().find_map(Module::cast).unwrap();
assert_eq!("doc", module.doc_comment_text().unwrap());
}
#[test]
fn test_doc_comment_preserves_indents() {
let file = SourceFile::parse(
r#"
/// doc1
/// ```
/// fn foo() {
/// // ...
/// }
/// ```
mod foo {}
"#,
)
.ok()
.unwrap();
let module = file.syntax().descendants().find_map(Module::cast).unwrap();
assert_eq!("doc1\n```\nfn foo() {\n // ...\n}\n```", module.doc_comment_text().unwrap());
}
#[test]
fn test_doc_comment_preserves_newlines() {
let file = SourceFile::parse(
r#"
/// this
/// is
/// mod
/// foo
mod foo {}
"#,
)
.ok()
.unwrap();
let module = file.syntax().descendants().find_map(Module::cast).unwrap();
assert_eq!("this\nis\nmod\nfoo", module.doc_comment_text().unwrap());
}
#[test]
fn test_where_predicates() {
fn assert_bound(text: &str, bound: Option<TypeBound>) {
assert_eq!(text, bound.unwrap().syntax().text().to_string());
}
let file = SourceFile::parse(
r#"
fn foo()
where
T: Clone + Copy + Debug + 'static,
'a: 'b + 'c,
Iterator::Item: 'a + Debug,
Iterator::Item: Debug + 'a,
<T as Iterator>::Item: Debug + 'a,
for<'a> F: Fn(&'a str)
{}
"#,
)
.ok()
.unwrap();
let where_clause = file.syntax().descendants().find_map(WhereClause::cast).unwrap();
let mut predicates = where_clause.predicates();
let pred = predicates.next().unwrap();
let mut bounds = pred.type_bound_list().unwrap().bounds();
assert_eq!("T", pred.type_ref().unwrap().syntax().text().to_string());
assert_bound("Clone", bounds.next());
assert_bound("Copy", bounds.next());
assert_bound("Debug", bounds.next());
assert_bound("'static", bounds.next());
let pred = predicates.next().unwrap();
let mut bounds = pred.type_bound_list().unwrap().bounds();
assert_eq!("'a", pred.lifetime_token().unwrap().text());
assert_bound("'b", bounds.next());
assert_bound("'c", bounds.next());
let pred = predicates.next().unwrap();
let mut bounds = pred.type_bound_list().unwrap().bounds();
assert_eq!("Iterator::Item", pred.type_ref().unwrap().syntax().text().to_string());
assert_bound("'a", bounds.next());
let pred = predicates.next().unwrap();
let mut bounds = pred.type_bound_list().unwrap().bounds();
assert_eq!("Iterator::Item", pred.type_ref().unwrap().syntax().text().to_string());
assert_bound("Debug", bounds.next());
assert_bound("'a", bounds.next());
let pred = predicates.next().unwrap();
let mut bounds = pred.type_bound_list().unwrap().bounds();
assert_eq!("<T as Iterator>::Item", pred.type_ref().unwrap().syntax().text().to_string());
assert_bound("Debug", bounds.next());
assert_bound("'a", bounds.next());
let pred = predicates.next().unwrap();
let mut bounds = pred.type_bound_list().unwrap().bounds();
assert_eq!("for<'a> F", pred.type_ref().unwrap().syntax().text().to_string());
assert_bound("Fn(&'a str)", bounds.next());
}
|
