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// We can expose more detail on the error as the need arises, but start with an
// opaque error type for now.
use std::error::Error as StdError;
use std::fmt::{self, Debug, Display};
use std::iter;
#[allow(missing_docs)]
pub struct Error {
pub(crate) err: crate::gen::Error,
}
impl Error {
/// Returns the span of the error, if available.
pub fn span(&self) -> Option<proc_macro2::Span> {
match &self.err {
crate::gen::Error::Syn(err) => Some(err.span()),
_ => None,
}
}
}
impl From<crate::gen::Error> for Error {
fn from(err: crate::gen::Error) -> Self {
Error { err }
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
Display::fmt(&self.err, f)
}
}
impl Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
Debug::fmt(&self.err, f)
}
}
impl StdError for Error {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
self.err.source()
}
}
impl IntoIterator for Error {
type Item = Error;
type IntoIter = IntoIter;
fn into_iter(self) -> Self::IntoIter {
match self.err {
crate::gen::Error::Syn(err) => IntoIter::Syn(err.into_iter()),
_ => IntoIter::Other(iter::once(self)),
}
}
}
pub enum IntoIter {
Syn(<syn::Error as IntoIterator>::IntoIter),
Other(iter::Once<Error>),
}
impl Iterator for IntoIter {
type Item = Error;
fn next(&mut self) -> Option<Self::Item> {
match self {
IntoIter::Syn(iter) => iter
.next()
.map(|syn_err| Error::from(crate::gen::Error::Syn(syn_err))),
IntoIter::Other(iter) => iter.next(),
}
}
}
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