lexopt

Enum Error

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pub enum Error {
    MissingValue {
        option: Option<String>,
    },
    UnexpectedOption(String),
    UnexpectedArgument(OsString),
    UnexpectedValue {
        option: String,
        value: OsString,
    },
    ParsingFailed {
        value: String,
        error: Box<dyn Error + Send + Sync + 'static>,
    },
    NonUnicodeValue(OsString),
    Custom(Box<dyn Error + Send + Sync + 'static>),
}
Expand description

An error during argument parsing.

This implements From<String> and From<&str>, for easy ad-hoc error messages.

Variants§

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MissingValue

An option argument was expected but was not found.

Fields

§option: Option<String>

The most recently emitted option.

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UnexpectedOption(String)

An unexpected option was found.

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UnexpectedArgument(OsString)

A positional argument was found when none was expected.

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UnexpectedValue

An option had a value when none was expected.

Fields

§option: String

The option.

§value: OsString

The value.

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ParsingFailed

Parsing a value failed. Returned by methods on ValueExt.

Fields

§value: String

The string that failed to parse.

§error: Box<dyn Error + Send + Sync + 'static>

The error returned while parsing.

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NonUnicodeValue(OsString)

A value was found that was not valid unicode.

This can be returned by the methods on ValueExt.

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Custom(Box<dyn Error + Send + Sync + 'static>)

For custom error messages in application code.

Trait Implementations§

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impl Debug for Error

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Display for Error

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Error for Error

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fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any. Read more
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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
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fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type-based access to context intended for error reports. Read more
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impl<'a> From<&'a str> for Error

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fn from(msg: &'a str) -> Self

Converts to this type from the input type.
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impl From<OsString> for Error

For OsString::into_string, so it may be used with the try (?) operator.

ValueExt::string is the new preferred method because it’s compatible with catch-all error types like anyhow::Error.

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fn from(arg: OsString) -> Self

Converts to this type from the input type.
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impl From<String> for Error

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fn from(msg: String) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl Freeze for Error

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impl !RefUnwindSafe for Error

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impl Send for Error

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impl Sync for Error

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impl Unpin for Error

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impl !UnwindSafe for Error

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.