pub struct PossibleValuesParser(/* private fields */);
Expand description

Verify the value is from an enumerated set of PossibleValue.

See also:

§Example

Usage:

let mut cmd = clap::Command::new("raw")
    .arg(
        clap::Arg::new("color")
            .value_parser(clap::builder::PossibleValuesParser::new(["always", "auto", "never"]))
            .required(true)
    );

let m = cmd.try_get_matches_from_mut(["cmd", "always"]).unwrap();
let port: &String = m.get_one("color")
    .expect("required");
assert_eq!(port, "always");

Semantics:

let value_parser = clap::builder::PossibleValuesParser::new(["always", "auto", "never"]);
assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("always")).unwrap(), "always");
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("auto")).unwrap(), "auto");
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("never")).unwrap(), "never");

Implementations§

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impl PossibleValuesParser

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pub fn new(values: impl Into<PossibleValuesParser>) -> Self

Verify the value is from an enumerated set of PossibleValue.

Trait Implementations§

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impl Clone for PossibleValuesParser

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fn clone(&self) -> PossibleValuesParser

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for PossibleValuesParser

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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<I, T> From<I> for PossibleValuesParser
where I: IntoIterator<Item = T>, T: Into<PossibleValue>,

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fn from(values: I) -> Self

Converts to this type from the input type.
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impl TypedValueParser for PossibleValuesParser

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type Value = String

Argument’s value type
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fn parse_ref( &self, cmd: &Command, arg: Option<&Arg>, value: &OsStr ) -> Result<Self::Value, Error>

Parse the argument value Read more
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fn parse( &self, cmd: &Command, arg: Option<&Arg>, value: OsString ) -> Result<String, Error>

Parse the argument value Read more
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fn possible_values( &self ) -> Option<Box<dyn Iterator<Item = PossibleValue> + '_>>

Reflect on enumerated value properties Read more
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fn parse_ref_( &self, cmd: &Command, arg: Option<&Arg>, value: &OsStr, _source: ValueSource ) -> Result<Self::Value, Error>

Parse the argument value Read more
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fn parse_( &self, cmd: &Command, arg: Option<&Arg>, value: OsString, _source: ValueSource ) -> Result<Self::Value, Error>

Parse the argument value Read more
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fn map<T, F>(self, func: F) -> MapValueParser<Self, F>
where T: Send + Sync + Clone, F: Fn(Self::Value) -> T + Clone,

Adapt a TypedValueParser from one value to another Read more
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fn try_map<T, E, F>(self, func: F) -> TryMapValueParser<Self, F>
where F: Fn(Self::Value) -> Result<T, E> + Clone + Send + Sync + 'static, T: Send + Sync + Clone, E: Into<Box<dyn Error + Send + Sync + 'static>>,

Adapt a TypedValueParser from one value to another Read more

Auto Trait Implementations§

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<I> IntoResettable<ValueParser> for I
where I: Into<ValueParser>,

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fn into_resettable(self) -> Resettable<ValueParser>

Convert to the intended resettable type
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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.