aboutsummaryrefslogtreecommitdiff
path: root/crates/libsyntax2/src/grammar/items/structs.rs
blob: 41bd2a4e0a6c0a924cf085c191b3b598a9839aca (plain)
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
use super::*;

pub(super) fn struct_def(p: &mut Parser) {
    assert!(p.at(STRUCT_KW));
    p.bump();

    name(p);
    type_params::type_param_list(p);
    match p.current() {
        WHERE_KW => {
            type_params::where_clause(p);
            match p.current() {
                SEMI => {
                    p.bump();
                    return;
                }
                L_CURLY => named_fields(p),
                _ => {
                    //TODO: special case `(` error message
                    p.error("expected `;` or `{`");
                    return;
                }
            }
        }
        SEMI => {
            p.bump();
            return;
        }
        L_CURLY => named_fields(p),
        L_PAREN => {
            pos_fields(p);
            p.expect(SEMI);
        }
        _ => {
            p.error("expected `;`, `{`, or `(`");
            return;
        }
    }
}

pub(super) fn enum_def(p: &mut Parser) {
    assert!(p.at(ENUM_KW));
    p.bump();
    name(p);
    type_params::type_param_list(p);
    type_params::where_clause(p);
    if p.expect(L_CURLY) {
        while !p.at(EOF) && !p.at(R_CURLY) {
            let var = p.start();
            attributes::outer_attributes(p);
            if p.at(IDENT) {
                name(p);
                match p.current() {
                    L_CURLY => named_fields(p),
                    L_PAREN => pos_fields(p),
                    EQ => {
                        p.bump();
                        expressions::expr(p);
                    }
                    _ => (),
                }
                var.complete(p, ENUM_VARIANT);
            } else {
                var.abandon(p);
                p.err_and_bump("expected enum variant");
            }
            if !p.at(R_CURLY) {
                p.expect(COMMA);
            }
        }
        p.expect(R_CURLY);
    }
}

fn named_fields(p: &mut Parser) {
    assert!(p.at(L_CURLY));
    p.bump();
    while !p.at(R_CURLY) && !p.at(EOF) {
        named_field(p);
        if !p.at(R_CURLY) {
            p.expect(COMMA);
        }
    }
    p.expect(R_CURLY);

    fn named_field(p: &mut Parser) {
        let m = p.start();
        // test field_attrs
        // struct S {
        //     #[serde(with = "url_serde")]
        //     pub uri: Uri,
        // }
        attributes::outer_attributes(p);
        visibility(p);
        if p.at(IDENT) {
            name(p);
            p.expect(COLON);
            types::type_(p);
            m.complete(p, NAMED_FIELD);
        } else {
            m.abandon(p);
            p.err_and_bump("expected field declaration");
        }
    }
}

fn pos_fields(p: &mut Parser) {
    if !p.expect(L_PAREN) {
        return;
    }
    while !p.at(R_PAREN) && !p.at(EOF) {
        let pos_field = p.start();
        visibility(p);
        types::type_(p);
        pos_field.complete(p, POS_FIELD);

        if !p.at(R_PAREN) {
            p.expect(COMMA);
        }
    }
    p.expect(R_PAREN);
}