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
use super::*;
use indexmap::Equivalent;
#[derive(Copy, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
#[repr(transparent)]
pub struct Code(pub u64);
impl Code {
#[inline]
pub const fn new(pre: u64, post: u64) -> Code {
Code((pre & 0x00000000FFFFFFFF) | (post & 0xFFFFFFFF00000000))
}
#[inline]
pub const fn pure(self) -> u32 {
self.0 as u32
}
}
impl Debug for Code {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{:#x}", self.0)
}
}
impl Equivalent<TermId> for Code {
#[inline]
fn equivalent(&self, key: &TermId) -> bool {
*self == key.code()
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum Form {
Null = 0b000,
Head = 0b001,
Beta = 0b011,
Eta = 0b100,
HeadEta = 0b101,
BetaEta = 0b111,
}
impl Form {
#[inline]
pub const fn from_u8(x: u8) -> Form {
use Form::*;
match x {
0b000 => Null,
0b001 => Head,
0b011 => Beta,
0b100 => Eta,
0b101 => HeadEta,
0b111 => BetaEta,
_ => Null,
}
}
#[inline]
pub const fn is_hnf(self) -> bool {
self as u8 & Form::Head as u8 != 0
}
#[inline]
pub const fn is_bnf(self) -> bool {
self as u8 & Form::Beta as u8 != 0
}
#[inline]
pub const fn is_enf(self) -> bool {
self as u8 & Form::Eta as u8 != 0
}
#[inline]
pub const fn join(self, other: Form) -> Form {
Self::from_u8(self as u8 | other as u8)
}
#[inline]
pub const fn meet(self, other: Form) -> Form {
Self::from_u8(self as u8 & other as u8)
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn code_construction_sanity() {
assert_ne!(Code::new(0x10, 0x0), Code::new(0x20, 0x0));
}
}