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//! This file implements the error type for the crate.
use graph::error::Error as GError;
use std::fmt::{Display, Formatter};
#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd)]
/// The error type for NFA operations.
pub enum Error {
/// An unknown node id is encountered.
UnknownNode(usize),
/// Some operations are not supported by the implementations.
///
/// Everything is a trade-off, wink wink.
UnsupportedOperation,
/// This error comes from some underlying graph operation.
Graph(GError),
}
impl Display for Error {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
Error::UnknownNode(id) => write!(f, "unknown node: {id}"),
Error::UnsupportedOperation => write!(f, "unsupported operation"),
Error::Graph(e) => write!(f, "graph error: {e}"),
}
}
}
impl std::error::Error for Error {}
impl From<GError> for Error {
fn from(e: GError) -> Self {
Self::Graph(e)
}
}
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