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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
//! Renderer for macro invocations.
use assists::utils::{ImportScope, MergeBehaviour};
use hir::{Documentation, HasSource, ModPath};
use syntax::display::macro_label;
use test_utils::mark;
use crate::{
item::{CompletionItem, CompletionItemKind, CompletionKind},
render::RenderContext,
};
pub(crate) fn render_macro<'a>(
ctx: RenderContext<'a>,
import_data: Option<(ModPath, ImportScope, Option<MergeBehaviour>)>,
name: String,
macro_: hir::MacroDef,
) -> Option<CompletionItem> {
let _p = profile::span("render_macro");
MacroRender::new(ctx, name, macro_).render(import_data)
}
#[derive(Debug)]
struct MacroRender<'a> {
ctx: RenderContext<'a>,
name: String,
macro_: hir::MacroDef,
docs: Option<Documentation>,
bra: &'static str,
ket: &'static str,
}
impl<'a> MacroRender<'a> {
fn new(ctx: RenderContext<'a>, name: String, macro_: hir::MacroDef) -> MacroRender<'a> {
let docs = ctx.docs(macro_);
let docs_str = docs.as_ref().map_or("", |s| s.as_str());
let (bra, ket) = guess_macro_braces(&name, docs_str);
MacroRender { ctx, name, macro_, docs, bra, ket }
}
fn render(
&self,
import_data: Option<(ModPath, ImportScope, Option<MergeBehaviour>)>,
) -> Option<CompletionItem> {
// FIXME: Currently proc-macro do not have ast-node,
// such that it does not have source
if self.macro_.is_proc_macro() {
return None;
}
let mut builder =
CompletionItem::new(CompletionKind::Reference, self.ctx.source_range(), &self.label())
.kind(CompletionItemKind::Macro)
.set_documentation(self.docs.clone())
.set_deprecated(self.ctx.is_deprecated(self.macro_))
.import_data(import_data)
.detail(self.detail());
let needs_bang = self.needs_bang();
builder = match self.ctx.snippet_cap() {
Some(cap) if needs_bang => {
let snippet = self.snippet();
let lookup = self.lookup();
builder.insert_snippet(cap, snippet).lookup_by(lookup)
}
None if needs_bang => builder.insert_text(self.banged_name()),
_ => {
mark::hit!(dont_insert_macro_call_parens_unncessary);
builder.insert_text(&self.name)
}
};
Some(builder.build())
}
fn needs_bang(&self) -> bool {
self.ctx.completion.use_item_syntax.is_none() && !self.ctx.completion.is_macro_call
}
fn label(&self) -> String {
if self.needs_bang() && self.ctx.snippet_cap().is_some() {
format!("{}!{}…{}", self.name, self.bra, self.ket)
} else {
self.banged_name()
}
}
fn snippet(&self) -> String {
format!("{}!{}$0{}", self.name, self.bra, self.ket)
}
fn lookup(&self) -> String {
self.banged_name()
}
fn banged_name(&self) -> String {
format!("{}!", self.name)
}
fn detail(&self) -> String {
let ast_node = self.macro_.source(self.ctx.db()).value;
macro_label(&ast_node)
}
}
fn guess_macro_braces(macro_name: &str, docs: &str) -> (&'static str, &'static str) {
let mut votes = [0, 0, 0];
for (idx, s) in docs.match_indices(¯o_name) {
let (before, after) = (&docs[..idx], &docs[idx + s.len()..]);
// Ensure to match the full word
if after.starts_with('!')
&& !before.ends_with(|c: char| c == '_' || c.is_ascii_alphanumeric())
{
// It may have spaces before the braces like `foo! {}`
match after[1..].chars().find(|&c| !c.is_whitespace()) {
Some('{') => votes[0] += 1,
Some('[') => votes[1] += 1,
Some('(') => votes[2] += 1,
_ => {}
}
}
}
// Insert a space before `{}`.
// We prefer the last one when some votes equal.
let (_vote, (bra, ket)) = votes
.iter()
.zip(&[(" {", "}"), ("[", "]"), ("(", ")")])
.max_by_key(|&(&vote, _)| vote)
.unwrap();
(*bra, *ket)
}
#[cfg(test)]
mod tests {
use test_utils::mark;
use crate::test_utils::check_edit;
#[test]
fn dont_insert_macro_call_parens_unncessary() {
mark::check!(dont_insert_macro_call_parens_unncessary);
check_edit(
"frobnicate!",
r#"
//- /main.rs crate:main deps:foo
use foo::<|>;
//- /foo/lib.rs crate:foo
#[macro_export]
macro_rules frobnicate { () => () }
"#,
r#"
use foo::frobnicate;
"#,
);
check_edit(
"frobnicate!",
r#"
macro_rules frobnicate { () => () }
fn main() { frob<|>!(); }
"#,
r#"
macro_rules frobnicate { () => () }
fn main() { frobnicate!(); }
"#,
);
}
#[test]
fn guesses_macro_braces() {
check_edit(
"vec!",
r#"
/// Creates a [`Vec`] containing the arguments.
///
/// ```
/// let v = vec![1, 2, 3];
/// assert_eq!(v[0], 1);
/// assert_eq!(v[1], 2);
/// assert_eq!(v[2], 3);
/// ```
macro_rules! vec { () => {} }
fn fn main() { v<|> }
"#,
r#"
/// Creates a [`Vec`] containing the arguments.
///
/// ```
/// let v = vec![1, 2, 3];
/// assert_eq!(v[0], 1);
/// assert_eq!(v[1], 2);
/// assert_eq!(v[2], 3);
/// ```
macro_rules! vec { () => {} }
fn fn main() { vec![$0] }
"#,
);
check_edit(
"foo!",
r#"
/// Foo
///
/// Don't call `fooo!()` `fooo!()`, or `_foo![]` `_foo![]`,
/// call as `let _=foo! { hello world };`
macro_rules! foo { () => {} }
fn main() { <|> }
"#,
r#"
/// Foo
///
/// Don't call `fooo!()` `fooo!()`, or `_foo![]` `_foo![]`,
/// call as `let _=foo! { hello world };`
macro_rules! foo { () => {} }
fn main() { foo! {$0} }
"#,
)
}
}
|
