Struct clap_builder::builder::BoolishValueParser

source ·
#[non_exhaustive]
pub struct BoolishValueParser {}
Expand description

Parse bool-like string values, everything else is true

See also:

§Example

Usage:

let mut cmd = clap::Command::new("raw")
    .arg(
        clap::Arg::new("append")
            .value_parser(clap::builder::BoolishValueParser::new())
            .required(true)
    );

let m = cmd.try_get_matches_from_mut(["cmd", "true"]).unwrap();
let port: bool = *m.get_one("append")
    .expect("required");
assert_eq!(port, true);

Semantics:

let value_parser = clap::builder::BoolishValueParser::new();
assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("100")).is_err());
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("true")).unwrap(), true);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("Yes")).unwrap(), true);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("oN")).unwrap(), true);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("1")).unwrap(), true);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("false")).unwrap(), false);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("No")).unwrap(), false);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("oFF")).unwrap(), false);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("0")).unwrap(), false);

Implementations§

source§

impl BoolishValueParser

source

pub fn new() -> Self

Parse bool-like string values, everything else is an error.

Trait Implementations§

source§

impl Clone for BoolishValueParser

source§

fn clone(&self) -> BoolishValueParser

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl Debug for BoolishValueParser

source§

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

Formats the value using the given formatter. Read more
source§

impl Default for BoolishValueParser

source§

fn default() -> Self

Returns the “default value” for a type. Read more
source§

impl TypedValueParser for BoolishValueParser

§

type Value = bool

Argument’s value type
source§

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

Parse the argument value Read more
source§

fn possible_values( &self ) -> Option<Box<dyn Iterator<Item = PossibleValue> + '_>>

Reflect on enumerated value properties Read more
source§

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

Parse the argument value Read more
source§

fn parse( &self, cmd: &Command, arg: Option<&Arg>, value: OsString ) -> Result<Self::Value, Error>

Parse the argument value Read more
source§

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

Parse the argument value Read more
source§

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
source§

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
source§

impl Copy for BoolishValueParser

Auto Trait Implementations§

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

source§

fn into(self) -> U

Calls U::from(self).

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

source§

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

source§

fn into_resettable(self) -> Resettable<ValueParser>

Convert to the intended resettable type
source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

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

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.