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use std::fmt;
use std::io::Error as IoError;
use zip::result::ZipError;
#[derive(Debug)]
pub struct Eu4Error(Box<Eu4ErrorKind>);
impl Eu4Error {
pub(crate) fn new(kind: Eu4ErrorKind) -> Eu4Error {
Eu4Error(Box::new(kind))
}
pub fn kind(&self) -> &Eu4ErrorKind {
&self.0
}
}
#[derive(Debug)]
pub enum Eu4ErrorKind {
ZipCentralDirectory(ZipError),
ZipMissingEntry(&'static str, ZipError),
ZipExtraction(&'static str, IoError),
ZipSize(&'static str),
IoErr(IoError),
UnknownHeader,
UnknownToken {
token_id: u16,
},
Deserialize {
part: Option<String>,
err: jomini::Error,
},
}
impl fmt::Display for Eu4Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.kind() {
Eu4ErrorKind::ZipCentralDirectory(_) => {
write!(f, "unable to read zip central directory")
}
Eu4ErrorKind::ZipMissingEntry(s, _) => write!(f, "unable to locate {} in zip", s),
Eu4ErrorKind::ZipExtraction(s, _) => write!(f, "unable to extract {} in zip", s),
Eu4ErrorKind::ZipSize(s) => write!(f, "{} in zip is too large", s),
Eu4ErrorKind::IoErr(_) => write!(f, "io error"),
Eu4ErrorKind::UnknownHeader => write!(f, "unknown header encountered in zip"),
Eu4ErrorKind::UnknownToken { token_id } => {
write!(f, "unknown binary token encountered (id: {})", token_id)
}
Eu4ErrorKind::Deserialize { ref part, ref err } => match part {
Some(p) => write!(f, "error deserializing: {}: {}", p, err),
None => err.fmt(f),
},
}
}
}
impl std::error::Error for Eu4Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self.kind() {
Eu4ErrorKind::ZipCentralDirectory(e) => Some(e),
Eu4ErrorKind::ZipMissingEntry(_, e) => Some(e),
Eu4ErrorKind::ZipExtraction(_, e) => Some(e),
Eu4ErrorKind::IoErr(e) => Some(e),
Eu4ErrorKind::Deserialize { ref err, .. } => Some(err),
_ => None,
}
}
}
impl From<jomini::Error> for Eu4Error {
fn from(err: jomini::Error) -> Self {
Eu4Error::new(Eu4ErrorKind::Deserialize { part: None, err })
}
}
impl From<IoError> for Eu4Error {
fn from(err: IoError) -> Self {
Eu4Error::new(Eu4ErrorKind::IoErr(err))
}
}
impl From<Eu4ErrorKind> for Eu4Error {
fn from(err: Eu4ErrorKind) -> Self {
Eu4Error::new(err)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn size_of_error_test() {
assert_eq!(std::mem::size_of::<Eu4Error>(), 8);
}
}