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
|
use rustc_hash::FxHashSet;
use ra_syntax::{ast, AstNode, TextRange, Direction, SyntaxKind, SyntaxKind::*, SyntaxElement, T};
use ra_db::SourceDatabase;
use crate::{FileId, db::RootDatabase};
#[derive(Debug)]
pub struct HighlightedRange {
pub range: TextRange,
pub tag: &'static str,
}
fn is_control_keyword(kind: SyntaxKind) -> bool {
match kind {
T![for]
| T![loop]
| T![while]
| T![continue]
| T![break]
| T![if]
| T![else]
| T![match]
| T![return] => true,
_ => false,
}
}
pub(crate) fn highlight(db: &RootDatabase, file_id: FileId) -> Vec<HighlightedRange> {
let source_file = db.parse(file_id);
// Visited nodes to handle highlighting priorities
let mut highlighted: FxHashSet<SyntaxElement> = FxHashSet::default();
let mut res = Vec::new();
for node in source_file.syntax().descendants_with_tokens() {
if highlighted.contains(&node) {
continue;
}
let tag = match node.kind() {
COMMENT => "comment",
STRING | RAW_STRING | RAW_BYTE_STRING | BYTE_STRING => "string",
ATTR => "attribute",
NAME_REF => {
if let Some(name_ref) = node.as_node().and_then(|n| ast::NameRef::cast(n)) {
use crate::name_ref_kind::{classify_name_ref, NameRefKind::*};
use hir::{ModuleDef, ImplItem};
// FIXME: try to reuse the SourceAnalyzers
let analyzer = hir::SourceAnalyzer::new(db, file_id, name_ref.syntax(), None);
match classify_name_ref(db, &analyzer, name_ref) {
Some(Method(_)) => "function",
Some(Macro(_)) => "macro",
Some(FieldAccess(_)) => "field",
Some(AssocItem(ImplItem::Method(_))) => "function",
Some(AssocItem(ImplItem::Const(_))) => "constant",
Some(AssocItem(ImplItem::TypeAlias(_))) => "type",
Some(Def(ModuleDef::Module(_))) => "module",
Some(Def(ModuleDef::Function(_))) => "function",
Some(Def(ModuleDef::Struct(_))) => "type",
Some(Def(ModuleDef::Enum(_))) => "type",
Some(Def(ModuleDef::EnumVariant(_))) => "constant",
Some(Def(ModuleDef::Const(_))) => "constant",
Some(Def(ModuleDef::Static(_))) => "constant",
Some(Def(ModuleDef::Trait(_))) => "type",
Some(Def(ModuleDef::TypeAlias(_))) => "type",
Some(SelfType(_)) => "type",
Some(Pat(_)) => "text",
Some(SelfParam(_)) => "type",
Some(GenericParam(_)) => "type",
None => "text",
}
} else {
"text"
}
}
NAME => "function",
TYPE_ALIAS_DEF | TYPE_ARG | TYPE_PARAM => "type",
INT_NUMBER | FLOAT_NUMBER | CHAR | BYTE => "literal",
LIFETIME => "parameter",
T![unsafe] => "keyword.unsafe",
k if is_control_keyword(k) => "keyword.control",
k if k.is_keyword() => "keyword",
_ => {
if let Some(macro_call) = node.as_node().and_then(ast::MacroCall::cast) {
if let Some(path) = macro_call.path() {
if let Some(segment) = path.segment() {
if let Some(name_ref) = segment.name_ref() {
highlighted.insert(name_ref.syntax().into());
let range_start = name_ref.syntax().range().start();
let mut range_end = name_ref.syntax().range().end();
for sibling in path.syntax().siblings_with_tokens(Direction::Next) {
match sibling.kind() {
T![!] | IDENT => range_end = sibling.range().end(),
_ => (),
}
}
res.push(HighlightedRange {
range: TextRange::from_to(range_start, range_end),
tag: "macro",
})
}
}
}
}
continue;
}
};
res.push(HighlightedRange { range: node.range(), tag })
}
res
}
#[cfg(test)]
mod tests {
use insta::assert_debug_snapshot_matches;
use crate::mock_analysis::single_file;
#[test]
fn test_highlighting() {
let (analysis, file_id) = single_file(
r#"
#[derive(Clone, Debug)]
struct Foo {
pub x: i32,
pub y: i32,
}
fn foo<T>() -> T {
unimplemented!();
}
// comment
fn main() {}
println!("Hello, {}!", 92);
let mut vec = Vec::new();
vec.push(Foo { x: 0, y: 1 });
unsafe { vec.set_len(0); }
"#,
);
let result = analysis.highlight(file_id);
assert_debug_snapshot_matches!("highlighting", result);
}
}
|
