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
|
use join_to_string::join;
use ra_text_edit::TextEditBuilder;
use ra_syntax::{
ast::{self, AstNode, NameOwner, TypeParamsOwner},
SourceFileNode,
TextUnit,
};
use crate::{find_node_at_offset, assists::LocalEdit};
pub fn add_impl<'a>(
file: &'a SourceFileNode,
offset: TextUnit,
) -> Option<impl FnOnce() -> LocalEdit + 'a> {
let nominal = find_node_at_offset::<ast::NominalDef>(file.syntax(), offset)?;
let name = nominal.name()?;
Some(move || {
let type_params = nominal.type_param_list();
let mut edit = TextEditBuilder::new();
let start_offset = nominal.syntax().range().end();
let mut buf = String::new();
buf.push_str("\n\nimpl");
if let Some(type_params) = type_params {
type_params.syntax().text().push_to(&mut buf);
}
buf.push_str(" ");
buf.push_str(name.text().as_str());
if let Some(type_params) = type_params {
let lifetime_params = type_params
.lifetime_params()
.filter_map(|it| it.lifetime())
.map(|it| it.text());
let type_params = type_params
.type_params()
.filter_map(|it| it.name())
.map(|it| it.text());
join(lifetime_params.chain(type_params))
.surround_with("<", ">")
.to_buf(&mut buf);
}
buf.push_str(" {\n");
let offset = start_offset + TextUnit::of_str(&buf);
buf.push_str("\n}");
edit.insert(start_offset, buf);
LocalEdit {
label: "add impl".to_string(),
edit: edit.finish(),
cursor_position: Some(offset),
}
})
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_utils::check_action;
#[test]
fn test_add_impl() {
check_action(
"struct Foo {<|>}\n",
"struct Foo {}\n\nimpl Foo {\n<|>\n}\n",
|file, off| add_impl(file, off).map(|f| f()),
);
check_action(
"struct Foo<T: Clone> {<|>}",
"struct Foo<T: Clone> {}\n\nimpl<T: Clone> Foo<T> {\n<|>\n}",
|file, off| add_impl(file, off).map(|f| f()),
);
check_action(
"struct Foo<'a, T: Foo<'a>> {<|>}",
"struct Foo<'a, T: Foo<'a>> {}\n\nimpl<'a, T: Foo<'a>> Foo<'a, T> {\n<|>\n}",
|file, off| add_impl(file, off).map(|f| f()),
);
}
}
|
