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
|
//! Completion for derives
use hir::HasAttrs;
use itertools::Itertools;
use rustc_hash::FxHashMap;
use syntax::ast;
use crate::{
context::CompletionContext,
item::{CompletionItem, CompletionItemKind, CompletionKind},
Completions,
};
pub(super) fn complete_derive(
acc: &mut Completions,
ctx: &CompletionContext,
derive_input: ast::TokenTree,
) {
if let Some(existing_derives) = super::parse_comma_sep_input(derive_input) {
for (derive, docs) in get_derive_names_in_scope(ctx) {
let (label, lookup) = if let Some(derive_completion) = DEFAULT_DERIVE_COMPLETIONS
.iter()
.find(|derive_completion| derive_completion.label == derive)
{
let mut components = vec![derive_completion.label];
components.extend(
derive_completion
.dependencies
.iter()
.filter(|&&dependency| !existing_derives.contains(dependency)),
);
let lookup = components.join(", ");
let label = components.iter().rev().join(", ");
(label, Some(lookup))
} else if existing_derives.contains(&derive) {
continue;
} else {
(derive, None)
};
let mut item =
CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label);
item.kind(CompletionItemKind::Attribute);
if let Some(docs) = docs {
item.documentation(docs);
}
if let Some(lookup) = lookup {
item.lookup_by(lookup);
}
item.add_to(acc);
}
}
}
fn get_derive_names_in_scope(
ctx: &CompletionContext,
) -> FxHashMap<String, Option<hir::Documentation>> {
let mut result = FxHashMap::default();
ctx.scope.process_all_names(&mut |name, scope_def| {
if let hir::ScopeDef::MacroDef(mac) = scope_def {
if mac.kind() == hir::MacroKind::Derive {
result.insert(name.to_string(), mac.docs(ctx.db));
}
}
});
result
}
struct DeriveDependencies {
label: &'static str,
dependencies: &'static [&'static str],
}
/// Standard Rust derives that have dependencies
/// (the dependencies are needed so that the main derive don't break the compilation when added)
const DEFAULT_DERIVE_COMPLETIONS: &[DeriveDependencies] = &[
DeriveDependencies { label: "Copy", dependencies: &["Clone"] },
DeriveDependencies { label: "Eq", dependencies: &["PartialEq"] },
DeriveDependencies { label: "Ord", dependencies: &["PartialOrd", "Eq", "PartialEq"] },
DeriveDependencies { label: "PartialOrd", dependencies: &["PartialEq"] },
];
#[cfg(test)]
mod tests {
use expect_test::{expect, Expect};
use crate::tests::completion_list;
fn check(ra_fixture: &str, expect: Expect) {
let builtin_derives = r#"
#[rustc_builtin_macro]
pub macro Clone {}
#[rustc_builtin_macro]
pub macro Copy {}
#[rustc_builtin_macro]
pub macro Default {}
#[rustc_builtin_macro]
pub macro Debug {}
#[rustc_builtin_macro]
pub macro Hash {}
#[rustc_builtin_macro]
pub macro PartialEq {}
#[rustc_builtin_macro]
pub macro Eq {}
#[rustc_builtin_macro]
pub macro PartialOrd {}
#[rustc_builtin_macro]
pub macro Ord {}
"#;
let actual = completion_list(&format!("{} {}", builtin_derives, ra_fixture));
expect.assert_eq(&actual);
}
#[test]
fn no_completion_for_incorrect_derive() {
check(r#"#[derive{$0)] struct Test;"#, expect![[]])
}
#[test]
fn empty_derive() {
check(
r#"#[derive($0)] struct Test;"#,
expect![[r#"
at PartialEq
at Default
at PartialEq, Eq
at PartialEq, Eq, PartialOrd, Ord
at Clone, Copy
at Debug
at Clone
at Hash
at PartialEq, PartialOrd
"#]],
);
}
#[test]
fn derive_with_input() {
check(
r#"#[derive(serde::Serialize, PartialEq, $0)] struct Test;"#,
expect![[r#"
at Default
at Eq
at Eq, PartialOrd, Ord
at Clone, Copy
at Debug
at Clone
at Hash
at PartialOrd
"#]],
)
}
#[test]
fn derive_with_input2() {
check(
r#"#[derive($0 serde::Serialize, PartialEq)] struct Test;"#,
expect![[r#"
at Default
at Eq
at Eq, PartialOrd, Ord
at Clone, Copy
at Debug
at Clone
at Hash
at PartialOrd
"#]],
)
}
}
|
