smc_scan_core 0.1.0

Core module for the Scan model checker.
Documentation 
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use crate::{Oracle, Time};

/// An Metric Temporal Logic (MTL) formula.
#[derive(Debug, Clone)]
pub enum Mtl<V: Clone> {
    /// An atomic proposition in an [`Mtl`] formula.
    Atom(V),
    /// An [`Mtl`] formula of the form `p U q`.
    Until(V, V),
}

/// An oracle for (simple) [`Mtl`] properties.
///
/// Currently limited to properties of the form `p U q`.
#[derive(Debug, Default, Clone)]
pub struct MtlOracle {
    assumes: Vec<(Mtl<usize>, Option<bool>)>,
    guarantees: Vec<(Mtl<usize>, Option<bool>)>,
    time: Time,
}

impl MtlOracle {
    /// Add a new guarantee property to the [`Oracle`].
    pub fn add_guarantee(&mut self, mtl: Mtl<usize>) {
        self.guarantees.push((mtl, None));
    }

    /// Add a new assume property to the [`Oracle`].
    pub fn add_assume(&mut self, mtl: Mtl<usize>) {
        self.guarantees.push((mtl, None));
    }
}

impl Oracle for MtlOracle {
    fn update_state(&mut self, state: &[bool]) {
        self.guarantees
            .iter_mut()
            .chain(self.assumes.iter_mut())
            .for_each(|(mtl, opt)| {
                *opt = match mtl {
                    Mtl::Atom(i) => state.get(*i).cloned(),
                    Mtl::Until(lhs, rhs) => {
                        if opt.is_some() {
                            *opt
                        } else if state.get(*rhs).is_some_and(|b| *b) {
                            Some(true)
                        } else if state.get(*lhs).is_some_and(|b| *b) {
                            None
                        } else {
                            Some(false)
                        }
                    }
                }
            })
    }

    fn output_assumes(&self) -> impl Iterator<Item = Option<bool>> {
        self.assumes.iter().map(|(_, opt)| *opt)
    }

    fn output_guarantees(&self) -> impl Iterator<Item = Option<bool>> {
        self.guarantees.iter().map(|(_, opt)| *opt)
    }

    fn final_output_assumes(&self) -> impl Iterator<Item = bool> {
        self.assumes.iter().map(|(_, opt)| opt.unwrap_or(false))
    }

    fn final_output_guarantees(&self) -> impl Iterator<Item = bool> {
        self.guarantees.iter().map(|(_, opt)| opt.unwrap_or(false))
    }

    fn update_time(&mut self, time: Time) {
        self.time = time;
    }
}