pipa-js 0.1.1

A fast, minimal ES2023 JavaScript runtime built in Rust.
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
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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173

pub const REG_COUNT: usize = 8;

pub const REG_PC: usize = 0;
pub const REG_POS: usize = 0;
pub const REG_COUNTER: usize = 1;
pub const REG_TEMP: usize = 2;
pub const REG_SAVE0: usize = 3;
pub const REG_SAVE1: usize = 4;
pub const REG_SAVE2: usize = 5;
pub const REG_SAVE3: usize = 6;
pub const REG_MARK: usize = 7;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(u8)]
pub enum OpCode {
    Invalid = 0,

    MatchChar = 1,

    MatchCharI = 2,

    MatchChar32 = 3,

    MatchChar32I = 4,

    MatchDot = 5,

    MatchAny = 6,

    MatchClass = 7,
    MatchClassI = 8,

    CheckLineStart = 9,

    CheckLineEnd = 10,

    CheckWordBoundary = 11,
    CheckWordBoundaryI = 12,
    CheckNotWordBoundary = 13,
    CheckNotWordBoundaryI = 14,

    Jmp = 15,

    JmpMatch = 16,

    JmpFail = 17,

    JmpEq = 18,

    JmpNe = 19,

    JmpLt = 20,

    MovImm = 21,

    MovReg = 22,

    Inc = 23,

    Dec = 24,

    AddImm = 25,

    CmpImm = 26,

    SaveStart = 27,

    SaveEnd = 28,

    ResetCaptures = 29,

    CheckBackref = 30,
    CheckBackrefI = 31,

    Lookahead = 32,

    NegLookahead = 33,

    PushBacktrack = 34,

    PopBacktrack = 35,

    Mark = 36,

    Restore = 37,

    InitCounter = 38,

    CheckCounter = 39,

    Success = 40,

    Fail = 41,

    Halt = 42,
}

impl OpCode {
    pub fn from_u8(v: u8) -> Option<Self> {
        if v <= 42 {
            Some(unsafe { std::mem::transmute(v) })
        } else {
            None
        }
    }

    pub fn size(&self) -> usize {
        match self {
            OpCode::Invalid => 1,
            OpCode::MatchChar => 4,
            OpCode::MatchCharI => 4,
            OpCode::MatchChar32 => 6,
            OpCode::MatchChar32I => 6,
            OpCode::MatchDot => 1,
            OpCode::MatchAny => 1,
            OpCode::MatchClass => 4,
            OpCode::MatchClassI => 4,
            OpCode::CheckLineStart => 1,
            OpCode::CheckLineEnd => 1,
            OpCode::CheckWordBoundary => 1,
            OpCode::CheckWordBoundaryI => 1,
            OpCode::CheckNotWordBoundary => 1,
            OpCode::CheckNotWordBoundaryI => 1,
            OpCode::Jmp => 5,
            OpCode::JmpMatch => 5,
            OpCode::JmpFail => 5,
            OpCode::JmpEq => 10,
            OpCode::JmpNe => 10,
            OpCode::JmpLt => 10,
            OpCode::MovImm => 6,
            OpCode::MovReg => 3,
            OpCode::Inc => 2,
            OpCode::Dec => 2,
            OpCode::AddImm => 6,
            OpCode::CmpImm => 6,
            OpCode::SaveStart => 2,
            OpCode::SaveEnd => 2,
            OpCode::ResetCaptures => 3,
            OpCode::CheckBackref => 2,
            OpCode::CheckBackrefI => 2,
            OpCode::Lookahead => 5,
            OpCode::NegLookahead => 5,
            OpCode::PushBacktrack => 5,
            OpCode::PopBacktrack => 1,
            OpCode::Mark => 2,
            OpCode::Restore => 2,
            OpCode::InitCounter => 10,
            OpCode::CheckCounter => 6,
            OpCode::Success => 1,
            OpCode::Fail => 1,
            OpCode::Halt => 1,
        }
    }
}

pub const HEADER_FLAGS: usize = 0;
pub const HEADER_CAPTURE_COUNT: usize = 2;
pub const HEADER_REG_COUNT: usize = 3;
pub const HEADER_CODE_LEN: usize = 4;
pub const HEADER_LEN: usize = 8;

pub const FLAG_GLOBAL: u16 = 1 << 0;
pub const FLAG_IGNORE_CASE: u16 = 1 << 1;
pub const FLAG_MULTI_LINE: u16 = 1 << 2;
pub const FLAG_DOT_ALL: u16 = 1 << 3;
pub const FLAG_UNICODE: u16 = 1 << 4;
pub const FLAG_STICKY: u16 = 1 << 5;
pub const FLAG_INDICES: u16 = 1 << 6;
pub const FLAG_NAMED_GROUPS: u16 = 1 << 7;
pub const FLAG_UNICODE_SETS: u16 = 1 << 8;

pub const MAX_CAPTURES: usize = 255;
pub const MAX_BACKTRACK: usize = 10000;