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
|
use ra_db::{Cancelable, SyntaxDatabase};
use ra_syntax::{
AstNode, SyntaxNode,
ast::{self, NameOwner},
algo::visit::{visitor, Visitor},
};
use crate::{db::RootDatabase, RangeInfo, FilePosition, FileRange, NavigationTarget};
pub(crate) fn hover(
db: &RootDatabase,
position: FilePosition,
) -> Cancelable<Option<RangeInfo<String>>> {
let mut res = Vec::new();
let range = if let Some(rr) = db.approximately_resolve_symbol(position)? {
for nav in rr.resolves_to {
res.extend(doc_text_for(db, nav)?)
}
rr.reference_range
} else {
let file = db.source_file(position.file_id);
let expr: ast::Expr = ctry!(ra_editor::find_node_at_offset(
file.syntax(),
position.offset
));
let frange = FileRange {
file_id: position.file_id,
range: expr.syntax().range(),
};
res.extend(db.type_of(frange)?);
expr.syntax().range()
};
if res.is_empty() {
return Ok(None);
}
let res = RangeInfo::new(range, res.join("\n\n---\n"));
Ok(Some(res))
}
// FIXME: this should not really use navigation target. Rather, approximatelly
// resovled symbol should return a `DefId`.
fn doc_text_for(db: &RootDatabase, nav: NavigationTarget) -> Cancelable<Option<String>> {
let result = match (nav.description(db), nav.docs(db)) {
(Some(desc), Some(docs)) => Some("```rust\n".to_string() + &*desc + "\n```\n\n" + &*docs),
(Some(desc), None) => Some("```rust\n".to_string() + &*desc + "\n```"),
(None, Some(docs)) => Some(docs),
_ => None,
};
Ok(result)
}
impl NavigationTarget {
fn node(&self, db: &RootDatabase) -> Option<SyntaxNode> {
let source_file = db.source_file(self.file_id);
let source_file = source_file.syntax();
let node = source_file
.descendants()
.find(|node| node.kind() == self.kind && node.range() == self.range)?
.owned();
Some(node)
}
fn docs(&self, db: &RootDatabase) -> Option<String> {
let node = self.node(db)?;
let node = node.borrowed();
fn doc_comments<'a, N: ast::DocCommentsOwner<'a>>(node: N) -> Option<String> {
let comments = node.doc_comment_text();
if comments.is_empty() {
None
} else {
Some(comments)
}
}
visitor()
.visit(doc_comments::<ast::FnDef>)
.visit(doc_comments::<ast::StructDef>)
.visit(doc_comments::<ast::EnumDef>)
.visit(doc_comments::<ast::TraitDef>)
.visit(doc_comments::<ast::Module>)
.visit(doc_comments::<ast::TypeDef>)
.visit(doc_comments::<ast::ConstDef>)
.visit(doc_comments::<ast::StaticDef>)
.accept(node)?
}
/// Get a description of this node.
///
/// e.g. `struct Name`, `enum Name`, `fn Name`
fn description(&self, db: &RootDatabase) -> Option<String> {
// TODO: After type inference is done, add type information to improve the output
let node = self.node(db)?;
let node = node.borrowed();
// TODO: Refactor to be have less repetition
visitor()
.visit(|node: ast::FnDef| {
let mut string = "fn ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::StructDef| {
let mut string = "struct ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::EnumDef| {
let mut string = "enum ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::TraitDef| {
let mut string = "trait ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::Module| {
let mut string = "mod ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::TypeDef| {
let mut string = "type ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::ConstDef| {
let mut string = "const ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.visit(|node: ast::StaticDef| {
let mut string = "static ".to_string();
node.name()?.syntax().text().push_to(&mut string);
Some(string)
})
.accept(node)?
}
}
#[cfg(test)]
mod tests {
use ra_syntax::TextRange;
use crate::mock_analysis::single_file_with_position;
#[test]
fn hover_shows_type_of_an_expression() {
let (analysis, position) = single_file_with_position(
"
pub fn foo() -> u32 { 1 }
fn main() {
let foo_test = foo()<|>;
}
",
);
let hover = analysis.hover(position).unwrap().unwrap();
assert_eq!(hover.range, TextRange::from_to(95.into(), 100.into()));
assert_eq!(hover.info, "u32");
}
}
|