51 lines
1.2 KiB
Rust
51 lines
1.2 KiB
Rust
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use std::error;
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use std::fmt;
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use std::fmt::Write;
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#[derive(Debug, Clone)]
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pub struct Unexpected(String);
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impl fmt::Display for Unexpected {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Unexpected error occurred: {}", self.0)
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}
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}
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impl error::Error for Unexpected {}
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impl From<&str> for Unexpected {
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fn from(s: &str) -> Self {
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Unexpected(s.to_string())
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}
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}
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pub trait ToUnexpected {
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fn to_unexpected(&self) -> Unexpected;
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}
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impl<E: error::Error> ToUnexpected for E {
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fn to_unexpected(&self) -> Unexpected {
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let mut w = String::new();
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write!(w, "{}", self.to_string()).expect("underlying error formatted correctly");
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if let Some(src) = self.source() {
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write!(w, " [{src}]").expect("underyling source formatted correctly");
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}
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Unexpected(w.to_string())
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}
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}
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pub trait MapUnexpected<T> {
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fn map_unexpected(self) -> Result<T, Unexpected>;
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}
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impl<T, E: ToUnexpected> MapUnexpected<T> for Result<T, E> {
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fn map_unexpected(self) -> Result<T, Unexpected> {
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match self {
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Ok(t) => Ok(t),
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Err(err) => Err(err.to_unexpected()),
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}
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}
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}
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