100 lines
1.9 KiB
Rust
100 lines
1.9 KiB
Rust
//! Error handling.
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pub use failure::{Error, Fail};
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use std::fmt;
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macro_rules! ok {
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($v:expr, $msg:expr) => {
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match $v {
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Some(v) => Ok(v),
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None => Err(err_msg($msg)),
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}
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};
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}
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macro_rules! flag_ok {
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($t:ident, $v:expr) => {
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match $t::from_bits($v) {
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Some(v) => Ok(v),
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None => Err(err_msg(concat!("bad ", stringify!($t)))),
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}
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};
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}
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macro_rules! bail {
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($e:expr) => {
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return Err(err_msg($e));
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};
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}
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/// Returns an `Error` with a static string.
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///
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/// # Examples
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///
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/// ```
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/// use maraiah::durandal::err::err_msg;
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///
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/// assert_eq!(format!("{}", err_msg("oh no not things")), "oh no not things");
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/// ```
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pub fn err_msg(msg: &'static str) -> Error {ErrMsg(msg).into()}
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/// Returns an `Error` from a `ReprError`.
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///
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/// # Examples
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///
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/// ```
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/// use maraiah::durandal::err::repr_error;
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///
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/// assert_eq!(format!("{}", repr_error(77)), "representation error (got 77)");
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/// ```
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pub fn repr_error<T: Into<i64>>(n: T) -> Error {ReprError::new(n).into()}
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impl ReprError
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{
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/// Creates a new `ReprError`.
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///
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/// # Examples
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///
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/// ```
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/// use maraiah::durandal::err::ReprError;
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///
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/// let err = ReprError::new(7);
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///
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/// assert_eq!(format!("{}", err), "representation error (got 7)");
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/// ```
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#[inline]
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pub fn new<T: Into<i64>>(n: T) -> Self {Self(n.into())}
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}
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impl Fail for ReprError {}
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impl Fail for ErrMsg {}
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impl fmt::Display for ReprError
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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write!(f, "representation error (got {})", self.0)
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}
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}
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impl fmt::Display for ErrMsg
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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f.write_str(self.0)
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}
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}
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/// A representation error for an integer.
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#[derive(Debug, PartialEq)]
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pub struct ReprError(i64);
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#[derive(Debug)]
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struct ErrMsg(&'static str);
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/// A generic `failure` based `Result` type.
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pub type ResultS<T> = Result<T, Error>;
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// EOF
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