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use crate::error::ContextError; use crate::{ContextCompat, Report, StdError, WrapErr}; use core::fmt::{self, Debug, Display, Write}; #[cfg(backtrace)] use std::backtrace::Backtrace; mod ext { use super::*; pub trait StdError { #[cfg_attr(track_caller, track_caller)] fn ext_report<D>(self, msg: D) -> Report where D: Display + Send + Sync + 'static; } impl<E> StdError for E where E: std::error::Error + Send + Sync + 'static, { fn ext_report<D>(self, msg: D) -> Report where D: Display + Send + Sync + 'static, { Report::from_msg(msg, self) } } impl StdError for Report { fn ext_report<D>(self, msg: D) -> Report where D: Display + Send + Sync + 'static, { self.wrap_err(msg) } } } impl<T, E> WrapErr<T, E> for Result<T, E> where E: ext::StdError + Send + Sync + 'static, { fn wrap_err<D>(self, msg: D) -> Result<T, Report> where D: Display + Send + Sync + 'static, { match self { Ok(t) => Ok(t), Err(e) => Err(e.ext_report(msg)), } } fn wrap_err_with<D, F>(self, msg: F) -> Result<T, Report> where D: Display + Send + Sync + 'static, F: FnOnce() -> D, { match self { Ok(t) => Ok(t), Err(e) => Err(e.ext_report(msg())), } } fn context<D>(self, msg: D) -> Result<T, Report> where D: Display + Send + Sync + 'static, { self.wrap_err(msg) } fn with_context<D, F>(self, msg: F) -> Result<T, Report> where D: Display + Send + Sync + 'static, F: FnOnce() -> D, { self.wrap_err_with(msg) } } impl<T> ContextCompat<T> for Option<T> { fn wrap_err<D>(self, msg: D) -> Result<T, Report> where D: Display + Send + Sync + 'static, { self.context(msg) } fn wrap_err_with<D, F>(self, msg: F) -> Result<T, Report> where D: Display + Send + Sync + 'static, F: FnOnce() -> D, { self.with_context(msg) } fn context<D>(self, msg: D) -> Result<T, Report> where D: Display + Send + Sync + 'static, { match self { Some(t) => Ok(t), None => Err(Report::from_display(msg)), } } fn with_context<D, F>(self, msg: F) -> Result<T, Report> where D: Display + Send + Sync + 'static, F: FnOnce() -> D, { match self { Some(t) => Ok(t), None => Err(Report::from_display(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> StdError for ContextError<D, Report> where D: Display, { 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 {} impl<T, E> Sealed for Result<T, E> where E: ext::StdError {} impl<T> Sealed for Option<T> {} }