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
|
use libsyntax2::{
File, TextRange, SyntaxNodeRef,
SyntaxKind::*,
algo::{find_leaf_at_offset, find_covering_node, ancestors, Direction, siblings},
};
pub fn extend_selection(file: &File, range: TextRange) -> Option<TextRange> {
let syntax = file.syntax();
extend(syntax.borrowed(), range)
}
pub(crate) fn extend(root: SyntaxNodeRef, range: TextRange) -> Option<TextRange> {
if range.is_empty() {
let offset = range.start();
let mut leaves = find_leaf_at_offset(root, offset);
if let Some(leaf) = leaves.clone().find(|node| node.kind() != WHITESPACE) {
return Some(leaf.range());
}
let ws = leaves.next()?;
let ws_text = ws.leaf_text().unwrap();
let range = TextRange::from_to(offset, ws.range().end()) - ws.range().start();
let ws_suffix = &ws_text.as_str()[range];
if ws_text.contains("\n") && !ws_suffix.contains("\n") {
if let Some(node) = ws.next_sibling() {
return Some(node.range());
}
}
return Some(ws.range());
};
let node = find_covering_node(root, range);
if node.kind() == COMMENT && range == node.range() {
if let Some(range) = extend_comments(node) {
return Some(range);
}
}
match ancestors(node).skip_while(|n| n.range() == range).next() {
None => None,
Some(parent) => Some(parent.range()),
}
}
fn extend_comments(node: SyntaxNodeRef) -> Option<TextRange> {
let left = adj_comments(node, Direction::Backward);
let right = adj_comments(node, Direction::Forward);
if left != right {
Some(TextRange::from_to(
left.range().start(),
right.range().end(),
))
} else {
None
}
}
fn adj_comments(node: SyntaxNodeRef, dir: Direction) -> SyntaxNodeRef {
let mut res = node;
for node in siblings(node, dir) {
match node.kind() {
COMMENT => res = node,
WHITESPACE if !node.leaf_text().unwrap().as_str().contains("\n\n") => (),
_ => break
}
}
res
}
|
