84 lines
2.0 KiB
Rust
84 lines
2.0 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Error handling utilities. WIP.
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use std::fmt;
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use std::fmt::{Debug, Formatter};
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use std::old_io::IoError;
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pub type CliError = Box<Error + 'static>;
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pub type CliResult<T> = Result<T, CliError>;
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pub type CommandError = Box<Error + 'static>;
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pub type CommandResult<T> = Result<T, CommandError>;
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pub trait Error {
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fn description(&self) -> &str;
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fn detail(&self) -> Option<&str> { None }
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fn cause(&self) -> Option<&Error> { None }
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}
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pub trait FromError<E> {
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fn from_err(err: E) -> Self;
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}
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impl Debug for Box<Error + 'static> {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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write!(f, "{}", self.description())
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}
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}
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impl<E: Error + 'static> FromError<E> for Box<Error + 'static> {
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fn from_err(err: E) -> Box<Error + 'static> {
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box err as Box<Error>
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}
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}
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impl<'a> Error for &'a str {
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fn description<'b>(&'b self) -> &'b str {
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*self
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}
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}
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impl Error for String {
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fn description<'a>(&'a self) -> &'a str {
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&self[]
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}
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}
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impl<'a> Error for Box<Error + 'a> {
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fn description(&self) -> &str { (**self).description() }
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fn detail(&self) -> Option<&str> { (**self).detail() }
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fn cause(&self) -> Option<&Error> { (**self).cause() }
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}
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impl FromError<()> for () {
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fn from_err(_: ()) -> () { () }
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}
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impl FromError<IoError> for IoError {
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fn from_err(error: IoError) -> IoError { error }
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}
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impl Error for IoError {
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fn description(&self) -> &str {
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self.desc
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}
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fn detail(&self) -> Option<&str> {
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self.detail.as_ref().map(|s| &s[])
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}
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}
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//fn iter_map_err<T, U, E, I: Iterator<Result<T,E>>>(iter: I,
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