| 1 | use std::error; |
|---|---|
| 2 | use std::fmt; |
| 3 | use std::io; |
| 4 | use std::num; |
| 5 | use std::process; |
| 6 | use std::str; |
| 7 | |
| 8 | /// A common error type for the `autocfg` crate. |
| 9 | #[derive(Debug)] |
| 10 | pub struct Error { |
| 11 | kind: ErrorKind, |
| 12 | } |
| 13 | |
| 14 | impl error::Error for Error { |
| 15 | fn description(&self) -> &str { |
| 16 | "AutoCfg error" |
| 17 | } |
| 18 | |
| 19 | fn cause(&self) -> Option<&dynerror::Error> { |
| 20 | match self.kind { |
| 21 | ErrorKind::Io(ref e: &Error) => Some(e), |
| 22 | ErrorKind::Num(ref e: &ParseIntError) => Some(e), |
| 23 | ErrorKind::Utf8(ref e: &Utf8Error) => Some(e), |
| 24 | ErrorKind::Process(_) | ErrorKind::Other(_) => None, |
| 25 | } |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | impl fmt::Display for Error { |
| 30 | fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> { |
| 31 | match self.kind { |
| 32 | ErrorKind::Io(ref e: &Error) => e.fmt(f), |
| 33 | ErrorKind::Num(ref e: &ParseIntError) => e.fmt(f), |
| 34 | ErrorKind::Utf8(ref e: &Utf8Error) => e.fmt(f), |
| 35 | ErrorKind::Process(ref status: &ExitStatus) => { |
| 36 | // Same message as the newer `ExitStatusError` |
| 37 | write!(f, "process exited unsuccessfully:{} ", status) |
| 38 | } |
| 39 | ErrorKind::Other(s: &'static str) => s.fmt(f), |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | #[derive(Debug)] |
| 45 | enum ErrorKind { |
| 46 | Io(io::Error), |
| 47 | Num(num::ParseIntError), |
| 48 | Process(process::ExitStatus), |
| 49 | Utf8(str::Utf8Error), |
| 50 | Other(&'static str), |
| 51 | } |
| 52 | |
| 53 | pub fn from_exit(status: process::ExitStatus) -> Error { |
| 54 | Error { |
| 55 | kind: ErrorKind::Process(status), |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | pub fn from_io(e: io::Error) -> Error { |
| 60 | Error { |
| 61 | kind: ErrorKind::Io(e), |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | pub fn from_num(e: num::ParseIntError) -> Error { |
| 66 | Error { |
| 67 | kind: ErrorKind::Num(e), |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | pub fn from_utf8(e: str::Utf8Error) -> Error { |
| 72 | Error { |
| 73 | kind: ErrorKind::Utf8(e), |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | pub fn from_str(s: &'static str) -> Error { |
| 78 | Error { |
| 79 | kind: ErrorKind::Other(s), |
| 80 | } |
| 81 | } |
| 82 |