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#[doc(hidden)]
pub mod internal;
use std::{error, fmt};
pub type Error = Box<dyn error::Error + Send + Sync + 'static>;
pub type ErrorRef<'a> = &'a (dyn error::Error + 'static);
#[derive(Debug)]
struct ErrorChain<'a> {
error: std::sync::Arc<dyn error::Error + 'a>,
}
impl fmt::Display for ErrorChain<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut error = self.error.as_ref();
write!(f, "{}", &error)?;
while let Some(inner) = error.source() {
write!(f, ": {}", inner)?;
error = inner;
}
Ok(())
}
}
#[must_use]
pub fn print_error_chain<'a>(error: impl error::Error + 'a) -> impl fmt::Display + 'a {
ErrorChain {
error: std::sync::Arc::new(error),
}
}
#[derive(Debug)]
struct SimpleStringError {
message: &'static str,
}
impl fmt::Display for SimpleStringError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.message)
}
}
impl error::Error for SimpleStringError {}
#[deprecated = "Use ees::err!() instead"]
#[must_use]
pub fn error_with_message(message: &'static str) -> Error {
SimpleStringError { message }.into()
}
#[derive(Debug)]
struct SourceStringError {
message: &'static str,
source: Error,
}
impl fmt::Display for SourceStringError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.message)
}
}
impl error::Error for SourceStringError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(self.source.as_ref())
}
}
#[deprecated = "Use ees::wrap!() instead"]
#[must_use]
pub fn add_message(error: Error, message: &'static str) -> Error {
SourceStringError {
message,
source: error,
}
.into()
}
pub struct MainError {
error: Error,
}
impl fmt::Display for MainError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", print_error_chain(self.error.as_ref()))
}
}
impl fmt::Debug for MainError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", print_error_chain(self.error.as_ref()))
}
}
impl<E: Into<Error>> From<E> for MainError {
fn from(error: E) -> Self {
Self {
error: error.into(),
}
}
}
pub type MainResult = Result<(), MainError>;
#[macro_export]
macro_rules! err {
($($arg:tt)*) => {
$crate::Error::from($crate::internal::FormattedError {
message: std::format!($($arg)*),
})
}
}
#[macro_export]
macro_rules! bail {
($($arg:tt)*) => {
return Err($crate::err!($($arg)*).into());
}
}
#[macro_export]
macro_rules! wrap {
($source:expr, $($arg:tt)*) => {
$crate::Error::from($crate::internal::FormattedWrapError {
message: std::format!($($arg)*),
source: ($source),
})
}
}
pub fn to_err(error: impl Into<Error>) -> impl error::Error + Send + Sync + 'static {
internal::WrapError {
inner: error.into(),
}
}
#[cfg(test)]
mod tests {
use std::ops::Deref;
#[test]
fn error_types() {
let sample_error = std::fs::metadata("oihaoidbo89ya7dsuhaod8atntdao7sdy").unwrap_err();
let owned_error: crate::Error = sample_error.into();
let _error_ref: crate::ErrorRef = owned_error.as_ref();
let _error_ref_2: crate::ErrorRef = owned_error.deref();
}
#[test]
#[allow(deprecated)]
fn messages() {
let e = crate::error_with_message("unknown error");
let e = crate::add_message(e, "generic error");
let e = crate::wrap!(e, "{}", "test");
let printed = crate::print_error_chain(e.as_ref());
assert_eq!(printed.to_string(), "test: generic error: unknown error");
}
#[test]
fn formatted() {
let e = crate::err!("hello {}", "world");
let owned: crate::Error = e.into();
assert_eq!(owned.to_string(), "hello world");
}
fn test_bail() -> Result<(), crate::Error> {
crate::bail!("bailing");
}
fn _test_bail_main_result() -> crate::MainResult {
crate::bail!("test bail");
}
#[test]
fn to_err_tests() {
let error = test_bail().unwrap_err();
let actual_error = crate::to_err(error);
let actual_error_2 = crate::to_err(actual_error);
assert_eq!(
crate::print_error_chain(&actual_error_2).to_string(),
"bailing"
);
}
}