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use failure::{Backtrace, Context, Fail};
use std::fmt::{self, Display};
use std::io;
#[derive(Debug)]
pub struct Error {
inner: Context<ErrorKind>,
}
#[derive(Clone, Debug, Eq, Fail, PartialEq)]
pub enum ErrorKind {
#[fail(display = "Verification Error: {}", _0)]
Verification(String),
#[fail(display = "IntegerCast")]
IntegerCast,
#[fail(display = "IO Error")]
IOError,
#[fail(display = "Edge Addition Error")]
EdgeAddition,
#[fail(display = "Path Error")]
Path,
#[fail(display = "Invalid Cycle length: {}", _0)]
InvalidCycle(usize),
#[fail(display = "No Cycle")]
NoCycle,
#[fail(display = "No Solution")]
NoSolution,
}
impl Fail for Error {
fn cause(&self) -> Option<&dyn Fail> {
self.inner.cause()
}
fn backtrace(&self) -> Option<&Backtrace> {
self.inner.backtrace()
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
Display::fmt(&self.inner, f)
}
}
impl Error {
pub fn kind(&self) -> ErrorKind {
self.inner.get_context().clone()
}
}
impl From<ErrorKind> for Error {
fn from(kind: ErrorKind) -> Error {
Error {
inner: Context::new(kind),
}
}
}
impl From<Context<ErrorKind>> for Error {
fn from(inner: Context<ErrorKind>) -> Error {
Error { inner }
}
}
impl From<fmt::Error> for Error {
fn from(_error: fmt::Error) -> Error {
Error {
inner: Context::new(ErrorKind::IntegerCast),
}
}
}
impl From<io::Error> for Error {
fn from(_error: io::Error) -> Error {
Error {
inner: Context::new(ErrorKind::IOError),
}
}
}