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//! Error parsing an input into a [`Parsed`](crate::parsing::Parsed) struct
use core::fmt;
use crate::error;
/// An error that occurred while parsing the input into a [`Parsed`](crate::parsing::Parsed) struct.
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ParseFromDescription {
/// A string literal was not what was expected.
#[non_exhaustive]
InvalidLiteral,
/// A dynamic component was not valid.
InvalidComponent(&'static str),
/// The input was expected to have ended, but there are characters that remain.
#[non_exhaustive]
UnexpectedTrailingCharacters,
}
impl fmt::Display for ParseFromDescription {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::InvalidLiteral => f.write_str("a character literal was not valid"),
Self::InvalidComponent(name) => {
write!(f, "the '{name}' component could not be parsed")
}
Self::UnexpectedTrailingCharacters => {
f.write_str("unexpected trailing characters; the end of input was expected")
}
}
}
}
#[cfg(feature = "std")]
impl std::error::Error for ParseFromDescription {}
impl From<ParseFromDescription> for crate::Error {
fn from(original: ParseFromDescription) -> Self {
Self::ParseFromDescription(original)
}
}
impl TryFrom<crate::Error> for ParseFromDescription {
type Error = error::DifferentVariant;
fn try_from(err: crate::Error) -> Result<Self, Self::Error> {
match err {
crate::Error::ParseFromDescription(err) => Ok(err),
_ => Err(error::DifferentVariant),
}
}
}