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use anyhow::Error;
use varisat_formula::{Lit, Var};
use crate::processing::{CheckedProofStep, CheckedSamplingMode, CheckedUserVar, CheckerData};
#[derive(Debug)]
pub enum ProofTranscriptStep<'a> {
WitnessVar { var: Var },
SampleVar { var: Var },
HideVar { var: Var },
ObserveInternalVar { var: Var },
AddClause { clause: &'a [Lit] },
Unsat,
Model { assignment: &'a [Lit] },
Assume { assumptions: &'a [Lit] },
FailedAssumptions { failed_core: &'a [Lit] },
}
pub trait ProofTranscriptProcessor {
fn process_step(&mut self, step: &ProofTranscriptStep) -> Result<(), Error>;
}
#[derive(Default)]
pub(crate) struct Transcript {
lit_buf: Vec<Lit>,
}
impl Transcript {
pub fn transcript_step(
&mut self,
step: &CheckedProofStep,
data: CheckerData,
) -> Option<ProofTranscriptStep> {
match step {
CheckedProofStep::UserVar { var, user_var } => match user_var {
None => Some(ProofTranscriptStep::HideVar {
var: data.user_from_proof_var(*var).unwrap(),
}),
Some(CheckedUserVar {
sampling_mode: CheckedSamplingMode::Sample,
new_var: true,
..
}) => None,
Some(CheckedUserVar {
user_var,
sampling_mode: CheckedSamplingMode::Witness,
new_var: true,
}) => Some(ProofTranscriptStep::ObserveInternalVar { var: *user_var }),
Some(CheckedUserVar {
user_var,
sampling_mode: CheckedSamplingMode::Witness,
new_var: false,
}) => Some(ProofTranscriptStep::WitnessVar { var: *user_var }),
Some(CheckedUserVar {
user_var,
sampling_mode: CheckedSamplingMode::Sample,
new_var: false,
}) => Some(ProofTranscriptStep::SampleVar { var: *user_var }),
},
CheckedProofStep::AddClause { clause, .. }
| CheckedProofStep::DuplicatedClause { clause, .. }
| CheckedProofStep::TautologicalClause { clause, .. } => {
self.lit_buf.clear();
self.lit_buf.extend(clause.iter().map(|&lit| {
lit.map_var(|var| {
data.user_from_proof_var(var)
.expect("hidden variable in clause")
})
}));
Some(ProofTranscriptStep::AddClause {
clause: &self.lit_buf,
})
}
CheckedProofStep::AtClause { clause, .. } => {
if clause.is_empty() {
Some(ProofTranscriptStep::Unsat)
} else {
None
}
}
CheckedProofStep::Model { assignment } => {
self.lit_buf.clear();
self.lit_buf.extend(assignment.iter().flat_map(|&lit| {
data.user_from_proof_var(lit.var())
.map(|var| var.lit(lit.is_positive()))
}));
Some(ProofTranscriptStep::Model {
assignment: &self.lit_buf,
})
}
CheckedProofStep::Assumptions { assumptions } => {
self.lit_buf.clear();
self.lit_buf.extend(assumptions.iter().map(|&lit| {
lit.map_var(|var| {
data.user_from_proof_var(var)
.expect("hidden variable in assumptions")
})
}));
Some(ProofTranscriptStep::Assume {
assumptions: &self.lit_buf,
})
}
CheckedProofStep::FailedAssumptions { failed_core, .. } => {
self.lit_buf.clear();
self.lit_buf.extend(failed_core.iter().map(|&lit| {
lit.map_var(|var| {
data.user_from_proof_var(var)
.expect("hidden variable in assumptions")
})
}));
Some(ProofTranscriptStep::FailedAssumptions {
failed_core: &self.lit_buf,
})
}
_ => None,
}
}
}