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use std::borrow::Cow;
use std::error;
use std::ffi;
use std::fmt;
use std::io;
use std::net;
use std::num;
use std::result;
use std::string;
pub type Result<T> = result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
#[doc(hidden)]
MissingEntity(Cow<'static, str>),
#[doc(hidden)]
Incompatible(Cow<'static, str>),
#[doc(hidden)]
Io(io::Error),
#[doc(hidden)]
Other(Box<dyn error::Error + Send + 'static>),
#[doc(hidden)]
__Nonexhaustive,
}
impl Error {
#[doc(hidden)]
pub fn last_os_error() -> Error {
Error::from(io::Error::last_os_error())
}
#[doc(hidden)]
pub fn raw_os_error(&self) -> Option<i32> {
match self {
Error::Io(e) => e.raw_os_error(),
_ => None,
}
}
#[doc(hidden)]
pub fn missing_entity<T: Into<Cow<'static, str>>>(name: T) -> Error {
Error::MissingEntity(name.into())
}
#[doc(hidden)]
pub fn incompatible<T: Into<Cow<'static, str>>>(desc: T) -> Error {
Error::Incompatible(desc.into())
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Error::MissingEntity(name) => {
f.write_fmt(format_args!("Expected entity `{}` is missing", name))
}
Error::Incompatible(reason) => f.write_str(reason),
Error::Io(e) => fmt::Display::fmt(e, f),
Error::Other(e) => fmt::Display::fmt(e, f),
_ => f.write_str("Unknown error"),
}
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
Error::Io(e) => Some(&*e),
Error::Other(e) => Some(&**e),
_ => None,
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Error::Io(e)
}
}
impl From<num::ParseIntError> for Error {
fn from(e: num::ParseIntError) -> Self {
Error::Other(Box::new(e))
}
}
impl From<num::ParseFloatError> for Error {
fn from(e: num::ParseFloatError) -> Self {
Error::Other(Box::new(e))
}
}
impl From<ffi::NulError> for Error {
fn from(e: ffi::NulError) -> Self {
Error::Other(Box::new(e))
}
}
impl From<ffi::IntoStringError> for Error {
fn from(e: ffi::IntoStringError) -> Self {
Error::Other(Box::new(e))
}
}
impl From<string::ParseError> for Error {
fn from(e: string::ParseError) -> Self {
match e {}
}
}
impl From<string::FromUtf8Error> for Error {
fn from(e: string::FromUtf8Error) -> Self {
Error::Other(Box::new(e))
}
}
impl From<net::AddrParseError> for Error {
fn from(e: net::AddrParseError) -> Self {
Error::Other(Box::new(e))
}
}
impl<T> From<Box<T>> for Error
where
T: error::Error + Send + 'static,
{
fn from(e: Box<T>) -> Self {
Error::Other(e)
}
}
#[cfg(unix)]
impl From<nix::Error> for Error {
fn from(e: nix::Error) -> Self {
Error::Other(Box::new(e))
}
}