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|
use crate::std::fmt;
/// An error that can occur while parsing a [`Uuid`] string.
///
/// [`Uuid`]: ../struct.Uuid.html
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[allow(clippy::enum_variant_names)]
pub(crate) enum Error {
/// Invalid character in the [`Uuid`] string.
///
/// [`Uuid`]: ../struct.Uuid.html
InvalidCharacter {
/// The expected characters.
expected: &'static str,
/// The invalid character found.
found: char,
/// The invalid character position.
index: usize,
/// Indicates the [`Uuid`] starts with `urn:uuid:`.
///
/// This is a special case for [`Urn`] adapter parsing.
///
/// [`Uuid`]: ../Uuid.html
urn: UrnPrefix,
},
/// Invalid number of segments in the [`Uuid`] string.
///
/// [`Uuid`]: ../struct.Uuid.html
InvalidGroupCount {
/// The expected number of segments.
// TODO: explain multiple segment count.
// BODY: Parsers can expect a range of Uuid segment count.
// This needs to be expanded on.
expected: ExpectedLength,
/// The number of segments found.
found: usize,
},
/// Invalid length of a segment in a [`Uuid`] string.
///
/// [`Uuid`]: ../struct.Uuid.html
InvalidGroupLength {
/// The expected length of the segment.
expected: ExpectedLength,
/// The length of segment found.
found: usize,
/// The segment with invalid length.
group: usize,
},
/// Invalid length of the [`Uuid`] string.
///
/// [`Uuid`]: ../struct.Uuid.html
InvalidLength {
/// The expected length(s).
// TODO: explain multiple lengths.
// BODY: Parsers can expect a range of Uuid lenghts.
// This needs to be expanded on.
expected: ExpectedLength,
/// The invalid length found.
found: usize,
},
}
/// The expected length.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub(crate) enum ExpectedLength {
/// Expected any one of the given values.
Any(&'static [usize]),
/// Expected the given value.
Exact(usize),
}
/// Urn prefix value.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub(crate) enum UrnPrefix {
/// The `urn:uuid:` prefix should optionally provided.
Optional,
}
impl Error {
fn _description(&self) -> &str {
match *self {
Error::InvalidCharacter { .. } => "invalid character",
Error::InvalidGroupCount { .. } => "invalid number of groups",
Error::InvalidGroupLength { .. } => "invalid group length",
Error::InvalidLength { .. } => "invalid length",
}
}
}
impl fmt::Display for ExpectedLength {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
ExpectedLength::Any(crits) => write!(f, "one of {:?}", crits),
ExpectedLength::Exact(crit) => write!(f, "{}", crit),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}: ", self._description())?;
match *self {
Error::InvalidCharacter {
expected,
found,
index,
urn,
} => {
let urn_str = match urn {
UrnPrefix::Optional => {
" an optional prefix of `urn:uuid:` followed by"
}
};
write!(
f,
"expected{} {}, found {} at {}",
urn_str, expected, found, index
)
}
Error::InvalidGroupCount {
ref expected,
found,
} => write!(f, "expected {}, found {}", expected, found),
Error::InvalidGroupLength {
ref expected,
found,
group,
} => write!(
f,
"expected {}, found {} in group {}",
expected, found, group,
),
Error::InvalidLength {
ref expected,
found,
} => write!(f, "expected {}, found {}", expected, found),
}
}
}
#[cfg(feature = "std")]
mod std_support {
use super::*;
use crate::std::error;
impl error::Error for Error {}
}
|
