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use crate::error::ContextError; use crate::{ErrReport, EyreContext, StdError, WrapErr}; use core::fmt::{self, Debug, Display, Write}; #[cfg(backtrace)] use std::backtrace::Backtrace; mod ext { use super::*; pub trait StdError<C> where C: EyreContext, { fn ext_report<D>(self, msg: D) -> ErrReport<C> where D: Display + Send + Sync + 'static; } #[cfg(feature = "std")] impl<E, C> StdError<C> for E where C: EyreContext, E: std::error::Error + Send + Sync + 'static, { fn ext_report<D>(self, msg: D) -> ErrReport<C> where D: Display + Send + Sync + 'static, { ErrReport::from_msg(msg, self) } } impl<C> StdError<C> for ErrReport<C> where C: EyreContext, { fn ext_report<D>(self, msg: D) -> ErrReport<C> where D: Display + Send + Sync + 'static, { self.wrap_err(msg) } } } impl<T, E, C> WrapErr<T, E, C> for Result<T, E> where C: EyreContext, E: ext::StdError<C> + Send + Sync + 'static, { fn wrap_err<D>(self, msg: D) -> Result<T, ErrReport<C>> where D: Display + Send + Sync + 'static, { self.map_err(|error| error.ext_report(msg)) } fn wrap_err_with<D, F>(self, msg: F) -> Result<T, ErrReport<C>> where D: Display + Send + Sync + 'static, F: FnOnce() -> D, { self.map_err(|error| error.ext_report(msg())) } } impl<D, E> Debug for ContextError<D, E> where D: Display, E: Debug, { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.debug_struct("Error") .field("msg", &Quoted(&self.msg)) .field("source", &self.error) .finish() } } impl<D, E> Display for ContextError<D, E> where D: Display, { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { Display::fmt(&self.msg, f) } } impl<D, E> StdError for ContextError<D, E> where D: Display, E: StdError + 'static, { #[cfg(backtrace)] fn backtrace(&self) -> Option<&Backtrace> { self.error.backtrace() } fn source(&self) -> Option<&(dyn StdError + 'static)> { Some(&self.error) } } impl<D, C> StdError for ContextError<D, ErrReport<C>> where C: EyreContext, D: Display, { #[cfg(backtrace)] fn backtrace(&self) -> Option<&Backtrace> { Some(self.error.backtrace()) } fn source(&self) -> Option<&(dyn StdError + 'static)> { Some(self.error.inner.error()) } } struct Quoted<D>(D); impl<D> Debug for Quoted<D> where D: Display, { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { formatter.write_char('"')?; Quoted(&mut *formatter).write_fmt(format_args!("{}", self.0))?; formatter.write_char('"')?; Ok(()) } } impl Write for Quoted<&mut fmt::Formatter<'_>> { fn write_str(&mut self, s: &str) -> fmt::Result { Display::fmt(&s.escape_debug(), self.0) } } pub(crate) mod private { use super::*; pub trait Sealed<C: EyreContext> {} impl<T, E, C: EyreContext> Sealed<C> for Result<T, E> where E: ext::StdError<C> {} }