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 super::*;
pub(super) fn use_item(p: &mut Parser) {
assert!(p.at(USE_KW));
p.bump();
use_tree(p);
p.expect(SEMI);
}
fn use_tree(p: &mut Parser) {
let la = p.nth(1);
let m = p.start();
match (p.current(), la) {
(STAR, _) => p.bump(),
(COLONCOLON, STAR) => {
p.bump();
p.bump();
}
(L_CURLY, _) | (COLONCOLON, L_CURLY) => {
if p.at(COLONCOLON) {
p.bump();
}
nested_trees(p);
}
_ if paths::is_path_start(p) => {
paths::use_path(p);
match p.current() {
AS_KW => {
alias(p);
}
COLONCOLON => {
p.bump();
match p.current() {
STAR => {
p.bump();
}
L_CURLY => nested_trees(p),
_ => {
// is this unreachable?
p.error().message("expected `{` or `*`").emit();
}
}
}
_ => (),
}
}
_ => {
m.abandon(p);
p.err_and_bump("expected one of `*`, `::`, `{`, `self`, `super`, `indent`");
return;
}
}
m.complete(p, USE_TREE);
}
fn nested_trees(p: &mut Parser) {
assert!(p.at(L_CURLY));
p.bump();
while !p.at(EOF) && !p.at(R_CURLY) {
use_tree(p);
if !p.at(R_CURLY) {
p.expect(COMMA);
}
}
p.expect(R_CURLY);
}
|
