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
|
//! This crate provides those IDE features which use only a single file.
//!
//! This usually means functions which take syntax tree as an input and produce
//! an edit or some auxiliary info.
mod structure;
mod typing;
use rustc_hash::FxHashSet;
use ra_text_edit::TextEditBuilder;
use ra_syntax::{
SourceFile, SyntaxNode, TextRange, TextUnit, Direction,
algo::find_leaf_at_offset,
SyntaxKind::{self, *},
ast::{self, AstNode},
};
pub use crate::{
structure::{file_structure, StructureNode},
typing::{on_enter, on_dot_typed, on_eq_typed},
};
#[derive(Debug)]
pub struct LocalEdit {
pub label: String,
pub edit: ra_text_edit::TextEdit,
pub cursor_position: Option<TextUnit>,
}
#[derive(Debug)]
pub struct HighlightedRange {
pub range: TextRange,
pub tag: &'static str,
}
#[derive(Debug, Copy, Clone)]
pub enum Severity {
Error,
WeakWarning,
}
#[derive(Debug)]
pub struct Diagnostic {
pub range: TextRange,
pub msg: String,
pub severity: Severity,
pub fix: Option<LocalEdit>,
}
pub fn matching_brace(file: &SourceFile, offset: TextUnit) -> Option<TextUnit> {
const BRACES: &[SyntaxKind] =
&[L_CURLY, R_CURLY, L_BRACK, R_BRACK, L_PAREN, R_PAREN, L_ANGLE, R_ANGLE];
let (brace_node, brace_idx) = find_leaf_at_offset(file.syntax(), offset)
.filter_map(|node| {
let idx = BRACES.iter().position(|&brace| brace == node.kind())?;
Some((node, idx))
})
.next()?;
let parent = brace_node.parent()?;
let matching_kind = BRACES[brace_idx ^ 1];
let matching_node = parent.children().find(|node| node.kind() == matching_kind)?;
Some(matching_node.range().start())
}
pub fn highlight(root: &SyntaxNode) -> Vec<HighlightedRange> {
// Visited nodes to handle highlighting priorities
let mut highlighted = FxHashSet::default();
let mut res = Vec::new();
for node in root.descendants() {
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 => "text",
NAME => "function",
INT_NUMBER | FLOAT_NUMBER | CHAR | BYTE => "literal",
LIFETIME => "parameter",
k if k.is_keyword() => "keyword",
_ => {
if let Some(macro_call) = ast::MacroCall::cast(node) {
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());
let range_start = name_ref.syntax().range().start();
let mut range_end = name_ref.syntax().range().end();
for sibling in path.syntax().siblings(Direction::Next) {
match sibling.kind() {
EXCL | 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 ra_syntax::AstNode;
use insta::assert_debug_snapshot_matches;
use test_utils::{add_cursor, assert_eq_text, extract_offset};
use super::*;
#[test]
fn test_highlighting() {
let file = SourceFile::parse(
r#"
// comment
fn main() {}
println!("Hello, {}!", 92);
"#,
);
let hls = highlight(file.syntax());
assert_debug_snapshot_matches!("highlighting", hls);
}
#[test]
fn test_matching_brace() {
fn do_check(before: &str, after: &str) {
let (pos, before) = extract_offset(before);
let file = SourceFile::parse(&before);
let new_pos = match matching_brace(&file, pos) {
None => pos,
Some(pos) => pos,
};
let actual = add_cursor(&before, new_pos);
assert_eq_text!(after, &actual);
}
do_check("struct Foo { a: i32, }<|>", "struct Foo <|>{ a: i32, }");
}
}
|
