53 lines
1.7 KiB
Rust
53 lines
1.7 KiB
Rust
use std::{error, fmt};
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/// An enumeration of buffer creation errors
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[non_exhaustive]
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pub enum Error {
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/// No choices were provided to the Unstructured::choose call
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EmptyChoose,
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/// There was not enough underlying data to fulfill some request for raw
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/// bytes.
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NotEnoughData,
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/// The input bytes were not of the right format
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IncorrectFormat,
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Error::EmptyChoose => write!(
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f,
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"`arbitrary::Unstructured::choose` must be given a non-empty set of choices"
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),
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Error::NotEnoughData => write!(
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f,
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"There is not enough underlying raw data to construct an `Arbitrary` instance"
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),
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Error::IncorrectFormat => write!(
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f,
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"The raw data is not of the correct format to construct this type"
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),
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}
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}
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}
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impl error::Error for Error {}
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/// A `Result` with the error type fixed as `arbitrary::Error`.
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///
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/// Either an `Ok(T)` or `Err(arbitrary::Error)`.
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pub type Result<T, E = Error> = std::result::Result<T, E>;
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#[cfg(test)]
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mod tests {
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// Often people will import our custom `Result` type because 99.9% of
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// results in a file will be `arbitrary::Result` but then have that one last
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// 0.1% that want to have a custom error type. Don't make them prefix that
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// 0.1% as `std::result::Result`; instead, let `arbitrary::Result` have an
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// overridable error type.
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#[test]
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fn can_use_custom_error_types_with_result() -> super::Result<(), String> {
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Ok(())
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}
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}
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