| use std::error; |
| use std::fmt; |
| use std::io; |
| use std::num; |
| use std::str; |
| |
| /// A common error type for the `autocfg` crate. |
| #[derive(Debug)] |
| pub struct Error { |
| kind: ErrorKind, |
| } |
| |
| impl error::Error for Error { |
| fn description(&self) -> &str { |
| "AutoCfg error" |
| } |
| |
| fn cause(&self) -> Option<&error::Error> { |
| match self.kind { |
| ErrorKind::Io(ref e) => Some(e), |
| ErrorKind::Num(ref e) => Some(e), |
| ErrorKind::Utf8(ref e) => Some(e), |
| ErrorKind::Other(_) => None, |
| } |
| } |
| } |
| |
| impl fmt::Display for Error { |
| fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> { |
| match self.kind { |
| ErrorKind::Io(ref e) => e.fmt(f), |
| ErrorKind::Num(ref e) => e.fmt(f), |
| ErrorKind::Utf8(ref e) => e.fmt(f), |
| ErrorKind::Other(s) => s.fmt(f), |
| } |
| } |
| } |
| |
| #[derive(Debug)] |
| enum ErrorKind { |
| Io(io::Error), |
| Num(num::ParseIntError), |
| Utf8(str::Utf8Error), |
| Other(&'static str), |
| } |
| |
| pub fn from_io(e: io::Error) -> Error { |
| Error { |
| kind: ErrorKind::Io(e), |
| } |
| } |
| |
| pub fn from_num(e: num::ParseIntError) -> Error { |
| Error { |
| kind: ErrorKind::Num(e), |
| } |
| } |
| |
| pub fn from_utf8(e: str::Utf8Error) -> Error { |
| Error { |
| kind: ErrorKind::Utf8(e), |
| } |
| } |
| |
| pub fn from_str(s: &'static str) -> Error { |
| Error { |
| kind: ErrorKind::Other(s), |
| } |
| } |