102 lines
2.2 KiB
Rust
102 lines
2.2 KiB
Rust
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use std::error::Error as StdError;
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use std::fmt;
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use std::mem;
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use std::result;
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pub type Result<T> = result::Result<T, Error>;
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#[derive(Debug)]
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pub struct Error {
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repr: Repr,
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}
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enum Repr {
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Simple(ErrorKind),
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Custom(Box<Custom>),
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}
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#[derive(Debug)]
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struct Custom {
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kind: ErrorKind,
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error: Box<dyn StdError + Send + Sync>,
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}
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#[derive(Debug, Clone)]
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pub enum ErrorKind {
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MissedEnvVar(String),
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}
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impl fmt::Display for ErrorKind {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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match *self {
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ErrorKind::MissedEnvVar(ref name) => {
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write!(fmt, r#"Missed "{}" environment variable"#, name)
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}
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}
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}
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}
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impl PartialEq for ErrorKind {
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fn eq(&self, other: &Self) -> bool {
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mem::discriminant(self) == mem::discriminant(other)
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}
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}
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impl From<ErrorKind> for Error {
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#[inline]
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fn from(kind: ErrorKind) -> Error {
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Error {
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repr: Repr::Simple(kind),
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}
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}
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}
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impl Error {
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pub fn new<E>(kind: ErrorKind, error: E) -> Error
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where
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E: Into<Box<dyn StdError + Send + Sync>>,
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{
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Self::_new(kind, error.into())
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}
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fn _new(kind: ErrorKind, error: Box<dyn StdError + Send + Sync>) -> Error {
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Error {
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repr: Repr::Custom(Box::new(Custom { kind, error })),
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}
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}
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pub fn kind(&self) -> &ErrorKind {
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match &self.repr {
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Repr::Custom(ref c) => &c.kind,
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Repr::Simple(kind) => &kind,
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}
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}
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}
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impl fmt::Debug for Repr {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Repr::Custom(ref c) => fmt::Debug::fmt(&c, fmt),
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Repr::Simple(kind) => fmt.debug_tuple("Kind").field(&kind).finish(),
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}
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}
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}
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impl fmt::Display for Error {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self.repr {
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Repr::Custom(ref c) => c.error.fmt(fmt),
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Repr::Simple(kind) => write!(fmt, "{}", kind),
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}
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}
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}
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impl StdError for Error {
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fn source(&self) -> Option<&(dyn StdError + 'static)> {
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match self.repr {
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Repr::Simple(..) => None,
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Repr::Custom(ref c) => c.error.source(),
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}
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}
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}
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