use std::error;
use std::error::Error as StdError;
use std::fmt;
use std::result;
use std::io;
use std::string::FromUtf8Error;
use serde::de;
use serde::ser;
#[derive(Debug)]
pub enum Error {
Syntax,
Io(io::Error),
FromUtf8(FromUtf8Error),
Custom(String),
Eof,
StopCode,
TrailingBytes,
#[doc(hidden)]
__Nonexhaustive,
}
impl StdError for Error {
fn description(&self) -> &str {
match *self {
Error::Syntax => "syntax error",
Error::Io(ref error) => StdError::description(error),
Error::FromUtf8(ref error) => error.description(),
Error::Custom(ref s) => s,
Error::Eof => "unexpected end of file",
Error::StopCode => "unexpected stop code",
Error::TrailingBytes => "unexpected trailing bytes",
Error::__Nonexhaustive => unreachable!(),
}
}
fn cause(&self) -> Option<&error::Error> {
match *self {
Error::Io(ref error) => Some(error),
Error::FromUtf8(ref error) => Some(error),
_ => None,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::Custom(ref s) => write!(f, "custom error: {}", s),
_ => f.write_str(self.description()),
}
}
}
impl From<io::Error> for Error {
fn from(error: io::Error) -> Error {
Error::Io(error)
}
}
impl From<FromUtf8Error> for Error {
fn from(error: FromUtf8Error) -> Error {
Error::FromUtf8(error)
}
}
impl de::Error for Error {
fn custom<T: fmt::Display>(msg: T) -> Error {
Error::Custom(msg.to_string())
}
}
impl ser::Error for Error {
fn custom<T: fmt::Display>(msg: T) -> Error {
Error::Custom(msg.to_string())
}
}
pub type Result<T> = result::Result<T, Error>;