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//! Error that occurred at some stage of parsing
use core::fmt;
use crate::error::{self, ParseFromDescription, TryFromParsed};
/// An error that occurred at some stage of parsing.
#[allow(variant_size_differences)]
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Parse {
#[allow(clippy::missing_docs_in_private_items)]
TryFromParsed(TryFromParsed),
#[allow(clippy::missing_docs_in_private_items)]
ParseFromDescription(ParseFromDescription),
/// The input should have ended, but there were characters remaining.
#[non_exhaustive]
UnexpectedTrailingCharacters,
}
impl fmt::Display for Parse {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::TryFromParsed(err) => err.fmt(f),
Self::ParseFromDescription(err) => err.fmt(f),
Self::UnexpectedTrailingCharacters => f.write_str("unexpected trailing characters"),
}
}
}
#[cfg(feature = "std")]
impl std::error::Error for Parse {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Self::TryFromParsed(err) => Some(err),
Self::ParseFromDescription(err) => Some(err),
Self::UnexpectedTrailingCharacters => None,
}
}
}
impl From<TryFromParsed> for Parse {
fn from(err: TryFromParsed) -> Self {
Self::TryFromParsed(err)
}
}
impl TryFrom<Parse> for TryFromParsed {
type Error = error::DifferentVariant;
fn try_from(err: Parse) -> Result<Self, Self::Error> {
match err {
Parse::TryFromParsed(err) => Ok(err),
_ => Err(error::DifferentVariant),
}
}
}
impl From<ParseFromDescription> for Parse {
fn from(err: ParseFromDescription) -> Self {
Self::ParseFromDescription(err)
}
}
impl TryFrom<Parse> for ParseFromDescription {
type Error = error::DifferentVariant;
fn try_from(err: Parse) -> Result<Self, Self::Error> {
match err {
Parse::ParseFromDescription(err) => Ok(err),
_ => Err(error::DifferentVariant),
}
}
}
impl From<Parse> for crate::Error {
fn from(err: Parse) -> Self {
match err {
Parse::TryFromParsed(err) => Self::TryFromParsed(err),
Parse::ParseFromDescription(err) => Self::ParseFromDescription(err),
Parse::UnexpectedTrailingCharacters => Self::UnexpectedTrailingCharacters,
}
}
}
impl TryFrom<crate::Error> for Parse {
type Error = error::DifferentVariant;
fn try_from(err: crate::Error) -> Result<Self, Self::Error> {
match err {
crate::Error::ParseFromDescription(err) => Ok(Self::ParseFromDescription(err)),
crate::Error::UnexpectedTrailingCharacters => Ok(Self::UnexpectedTrailingCharacters),
crate::Error::TryFromParsed(err) => Ok(Self::TryFromParsed(err)),
_ => Err(error::DifferentVariant),
}
}
}
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