anthem 2.0.0

A command-line application for assisting in the verification of answer set programs
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

use {
    crate::verifying::{
        problem::Problem,
        prover::{Prover, Report, Status, StatusExtractionError},
    },
    std::{
        fmt::{self, Display},
        io::Write as _,
        process::{Command, Output, Stdio},
        time::{Duration, Instant},
    },
    thiserror::Error,
};

#[derive(Error, Debug)]
pub enum VampireError {
    #[error("unable to spawn vampire as a child process")]
    Spawn(#[source] std::io::Error),
    #[error("unable to write to vampire's stdin")]
    Write(#[source] std::io::Error),
    #[error("unable to wait for vampire")]
    Wait(#[source] std::io::Error),
    #[error("unable to convert output")]
    ConvertOutput(#[source] std::string::FromUtf8Error),
}

#[derive(Debug, Clone)]
pub struct VampireOutput {
    pub stdout: String,
    pub stderr: String,
}

impl TryFrom<Output> for VampireOutput {
    type Error = VampireError;

    fn try_from(value: Output) -> Result<Self, Self::Error> {
        // TODO: Should we do something about the exit status?!
        Ok(VampireOutput {
            stdout: String::from_utf8(value.stdout).map_err(VampireError::ConvertOutput)?,
            stderr: String::from_utf8(value.stderr).map_err(VampireError::ConvertOutput)?,
        })
    }
}

#[derive(Debug, Clone)]
pub struct VampireReport {
    pub problem: Problem,
    pub output: VampireOutput,
    pub elapsed_time: Duration,
}

impl Report for VampireReport {
    fn status(&self) -> Result<Status, StatusExtractionError> {
        self.output.stdout.parse()
    }
}

impl Display for VampireReport {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        writeln!(f, "--- {} ---", self.problem.name)?;
        writeln!(f)?;

        writeln!(f, "axioms:")?;
        for axiom in self.problem.axioms() {
            writeln!(f, "    {}", axiom.formula)?;
        }
        writeln!(f)?;

        writeln!(f, "conjectures:")?;
        for conjecture in self.problem.conjectures() {
            writeln!(f, "    {}", conjecture.formula)?;
        }
        writeln!(f)?;

        match self.status() {
            Ok(status) => writeln!(f, "status: {status}"),
            Err(error) => writeln!(f, "error: {error}"),
        }
    }
}

#[derive(Debug, Clone)]
pub struct Vampire {
    pub time_limit: usize,
    pub instances: usize,
    pub cores: usize,
}

impl Prover for Vampire {
    type Error = VampireError;
    type Report = VampireReport;

    fn instances(&self) -> usize {
        if self.instances == 0 {
            std::cmp::max(num_cpus::get() / self.cores(), 1)
        } else {
            self.instances
        }
    }

    fn cores(&self) -> usize {
        if self.cores == 0 {
            num_cpus::get()
        } else {
            self.cores
        }
    }

    fn prove(&self, problem: Problem) -> Result<Self::Report, Self::Error> {
        let start_time = Instant::now();

        let mut child = Command::new("vampire")
            .args([
                "--mode",
                "casc",
                "--time_limit",
                &self.time_limit.to_string(),
                "--cores",
                &self.cores().to_string(),
            ])
            .stdin(Stdio::piped())
            .stdout(Stdio::piped())
            .stderr(Stdio::piped())
            .spawn()
            .map_err(VampireError::Spawn)?;

        let mut stdin = child.stdin.take().unwrap();
        write!(stdin, "{problem}").map_err(VampireError::Write)?;
        drop(stdin);

        let output = child
            .wait_with_output()
            .map_err(VampireError::Wait)?
            .try_into()?;

        Ok(VampireReport {
            problem,
            output,
            elapsed_time: start_time.elapsed(),
        })
    }
}