diff options
Diffstat (limited to 'third_party/rust/autocfg/src/error.rs')
-rw-r--r-- | third_party/rust/autocfg/src/error.rs | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/third_party/rust/autocfg/src/error.rs b/third_party/rust/autocfg/src/error.rs new file mode 100644 index 0000000000..4624835451 --- /dev/null +++ b/third_party/rust/autocfg/src/error.rs @@ -0,0 +1,69 @@ +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), + } +} |