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
#![deny(missing_docs)]
use std::ops::Not;
pub mod dimacs;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Var(usize);
impl Var {
pub fn new(index: usize) -> Self {
Self(index)
}
pub fn index(self) -> usize {
self.0
}
pub fn pos_lit(self) -> Lit {
Lit::new(self, false)
}
pub fn neg_lit(self) -> Lit {
Lit::new(self, true)
}
}
#[derive(Clone, Copy, PartialEq, Debug)]
pub struct Lit(usize);
pub const UNDEF_LIT: Lit = Lit(usize::MAX);
impl Lit {
pub fn sign(self) -> bool {
self.0 & 1 == 1
}
pub fn var(self) -> Var {
Var(self.0 >> 1)
}
pub fn index(self) -> usize {
self.0
}
pub fn new(var: Var, sign: bool) -> Lit {
Lit(var.0 + var.0 + (sign as usize))
}
}
impl Not for Lit {
type Output = Self;
fn not(self) -> Self {
Lit(self.0 ^ 1)
}
}
#[derive(Clone, Copy, PartialEq, Debug)]
pub enum LBool {
True,
False,
Undef,
}
impl Not for LBool {
type Output = Self;
fn not(self) -> Self {
match self {
LBool::True => LBool::False,
LBool::False => LBool::True,
LBool::Undef => LBool::Undef,
}
}
}
impl From<bool> for LBool {
fn from(b: bool) -> Self {
if b {
LBool::True
} else {
LBool::False
}
}
}
#[derive(Clone, Debug)]
pub struct Clause {
pub lits: Vec<Lit>,
}
#[derive(Debug, PartialEq)]
pub enum Solution {
Unsat,
Best(Vec<bool>),
Sat(Vec<bool>),
Unknown,
}