ra_ap_parser 0.0.327

The Rust parser for rust-analyzer.
Documentation 
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

use super::*;

pub(super) const ATTRIBUTE_FIRST: TokenSet = TokenSet::new(&[T![#]]);

pub(super) fn inner_attrs(p: &mut Parser<'_>) {
    while p.at(T![#]) && p.nth(1) == T![!] {
        attr(p, true);
    }
}

pub(super) fn outer_attrs(p: &mut Parser<'_>) {
    while p.at(T![#]) {
        attr(p, false);
    }
}

fn attr(p: &mut Parser<'_>, inner: bool) {
    assert!(p.at(T![#]));

    let attr = p.start();
    p.bump(T![#]);

    if inner {
        p.bump(T![!]);
    }

    if p.expect(T!['[']) {
        meta(p);
        p.expect(T![']']);
    }

    attr.complete(p, ATTR);
}

// test_err meta_recovery
// #![]
// #![p = ]
// #![p::]
// #![p:: =]
// #![unsafe]
// #![unsafe =]

// test metas
// #![simple_ident]
// #![simple::path]
// #![simple_ident_expr = ""]
// #![simple::path::Expr = ""]
// #![simple_ident_tt(a b c)]
// #![simple_ident_tt[a b c]]
// #![simple_ident_tt{a b c}]
// #![simple::path::tt(a b c)]
// #![simple::path::tt[a b c]]
// #![simple::path::tt{a b c}]
// #![unsafe(simple_ident)]
// #![unsafe(simple::path)]
// #![unsafe(simple_ident_expr = "")]
// #![unsafe(simple::path::Expr = "")]
// #![unsafe(simple_ident_tt(a b c))]
// #![unsafe(simple_ident_tt[a b c])]
// #![unsafe(simple_ident_tt{a b c})]
// #![unsafe(simple::path::tt(a b c))]
// #![unsafe(simple::path::tt[a b c])]
// #![unsafe(simple::path::tt{a b c})]
pub(super) fn meta(p: &mut Parser<'_>) {
    let meta = p.start();
    let is_unsafe = p.eat(T![unsafe]);
    if is_unsafe {
        p.expect(T!['(']);
    }
    paths::attr_path(p);

    match p.current() {
        T![=] if !p.at(T![=>]) && !p.at(T![==]) => {
            p.bump(T![=]);
            if expressions::expr(p).is_none() {
                p.error("expected expression");
            }
        }
        T!['('] | T!['['] | T!['{'] => items::token_tree(p),
        _ => {}
    }
    if is_unsafe {
        p.expect(T![')']);
    }

    meta.complete(p, META);
}