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use std::fmt;
/// A bug in the solver itself (should never happen in normal operation).
/// Equivalent to Composer's SolverBugException.
#[derive(Debug, Clone)]
pub struct SolverBugError {
pub message: String,
}
impl fmt::Display for SolverBugError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Solver bug: {}", self.message)
}
}
impl std::error::Error for SolverBugError {}
/// Errors produced by the SAT solver.
#[derive(Debug)]
pub enum SolverError {
/// Internal solver bug (should never happen).
Bug(SolverBugError),
/// The dependency set is unsolvable. Contains problem descriptions.
Unsolvable(Vec<String>),
}
impl fmt::Display for SolverError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
SolverError::Bug(e) => write!(f, "{e}"),
SolverError::Unsolvable(problems) => {
for (i, problem) in problems.iter().enumerate() {
if i > 0 {
writeln!(f)?;
}
write!(f, " Problem {}: {problem}", i + 1)?;
}
Ok(())
}
}
}
}
impl std::error::Error for SolverError {}
impl From<SolverBugError> for SolverError {
fn from(e: SolverBugError) -> Self {
SolverError::Bug(e)
}
}
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