parser-generator/docs/expression.code.rs at main · mihavlic/parser-generator · GitHub

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

use gnag_runtime::lexer::*;
use gnag_runtime::parser::*;
use gnag_runtime::*;
pub fn File(p: &mut Parser) -> bool {
    'b0: {
        'b1: {
            let checkpoint = p.save_state();
            'b2: {
                if !Expression(p) {
                    break 'b2;
                }
                p.close_span(NodeKind::File);
                return true;
            }
            p.restore_state(checkpoint);
        }
        return false;
    }
}
pub fn Expression(p: &mut Parser) -> bool {
    'b0: {
        'b1: {
            let checkpoint = p.save_state();
            'b2: {
                'b3: {
                    'b4: {
                        let checkpoint = p.save_state();
                        'b5: {
                            if !l.token(nodeKind::Number) {
                                break 'b5;
                            }
                            p.close_span(NodeKind::Atom);
                            break 'b3;
                        }
                        p.restore_state(checkpoint);
                    }
                    break 'b2;
                }
                'b6: loop {
                    'b7: {
                        'b8: {
                            let checkpoint = p.save_state();
                            'b9: {
                                if !precedence < 1 {
                                    break 'b9;
                                }
                                if !l.token(nodeKind::Plus) {
                                    break 'b9;
                                }
                                Expression(p);
                                p.close_span(NodeKind::Add);
                                continue 'b6;
                            }
                            p.restore_state(checkpoint);
                        }
                        'b10: {
                            let checkpoint = p.save_state();
                            'b11: {
                                if !precedence < 2 {
                                    break 'b11;
                                }
                                if !l.token(nodeKind::Star) {
                                    break 'b11;
                                }
                                Expression(p);
                                p.close_span(NodeKind::Mul);
                                continue 'b6;
                            }
                            p.restore_state(checkpoint);
                        }
                        break 'b6;
                    }
                }
                return true;
            }
            p.restore_state(checkpoint);
        }
        return false;
    }
}
pub fn Lexer(p: &mut Parser) -> bool {
    'b0: {
        'b1: {
            let checkpoint = p.save_state();
            'b2: {
                if !l.ascii_class(CharacterClass::TODO) {
                    break 'b2;
                }
                'b3: {
                    match l.ascii_class(CharacterClass::TODO) {
                        true => continue 'b3,
                        false => break 'b3,
                    }
                }
                return Some(NodeKind::Space);
            }
            p.restore_state(checkpoint);
        }
        'b4: {
            let checkpoint = p.save_state();
            'b5: {
                if !l.bytes(b"+") {
                    break 'b5;
                }
                return Some(NodeKind::Plus);
            }
            p.restore_state(checkpoint);
        }
        'b6: {
            let checkpoint = p.save_state();
            'b7: {
                if !l.bytes(b"*") {
                    break 'b7;
                }
                return Some(NodeKind::Star);
            }
            p.restore_state(checkpoint);
        }
        'b8: {
            let checkpoint = p.save_state();
            'b9: {
                if !l.ascii_class(CharacterClass::TODO) {
                    break 'b9;
                }
                'b10: {
                    match l.ascii_class(CharacterClass::TODO) {
                        true => continue 'b10,
                        false => break 'b10,
                    }
                }
                return Some(NodeKind::Number);
            }
            p.restore_state(checkpoint);
        }
        'b11: {
            let checkpoint = p.save_state();
            'b12: {
                if !p.any() {
                    break 'b12;
                }
                return Some(NodeKind::Error);
            }
            p.restore_state(checkpoint);
        }
        return None;
    }
}