autocfg/
error.rs

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

autocfg/
error.rs
