Struct clap::builder::PossibleValuesParser
source · pub struct PossibleValuesParser(/* private fields */);
Expand description
Verify the value is from an enumerated set of PossibleValue
.
See also:
EnumValueParser
for directly supportingValueEnum
typesTypedValueParser::map
for adapting values to a more specialized type, like an external enums that can’t implementValueEnum
§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§
source§impl PossibleValuesParser
impl PossibleValuesParser
sourcepub fn new(values: impl Into<PossibleValuesParser>) -> PossibleValuesParser
pub fn new(values: impl Into<PossibleValuesParser>) -> PossibleValuesParser
Verify the value is from an enumerated set of PossibleValue
.
Trait Implementations§
source§impl Clone for PossibleValuesParser
impl Clone for PossibleValuesParser
source§fn clone(&self) -> PossibleValuesParser
fn clone(&self) -> PossibleValuesParser
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for PossibleValuesParser
impl Debug for PossibleValuesParser
source§impl<I, T> From<I> for PossibleValuesParser
impl<I, T> From<I> for PossibleValuesParser
source§fn from(values: I) -> PossibleValuesParser
fn from(values: I) -> PossibleValuesParser
Converts to this type from the input type.
source§impl TypedValueParser for PossibleValuesParser
impl TypedValueParser for PossibleValuesParser
source§fn parse_ref(
&self,
cmd: &Command,
arg: Option<&Arg>,
value: &OsStr
) -> Result<<PossibleValuesParser as TypedValueParser>::Value, Error>
fn parse_ref( &self, cmd: &Command, arg: Option<&Arg>, value: &OsStr ) -> Result<<PossibleValuesParser as TypedValueParser>::Value, Error>
Parse the argument value Read more
source§fn parse(
&self,
cmd: &Command,
arg: Option<&Arg>,
value: OsString
) -> Result<String, Error>
fn parse( &self, cmd: &Command, arg: Option<&Arg>, value: OsString ) -> Result<String, Error>
Parse the argument value Read more
source§fn possible_values(
&self
) -> Option<Box<dyn Iterator<Item = PossibleValue> + '_>>
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>
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,
_source: ValueSource
) -> Result<Self::Value, Error>
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>
fn map<T, F>(self, func: F) -> MapValueParser<Self, F>
Adapt a
TypedValueParser
from one value to another Read moreAuto Trait Implementations§
impl Freeze for PossibleValuesParser
impl RefUnwindSafe for PossibleValuesParser
impl Send for PossibleValuesParser
impl Sync for PossibleValuesParser
impl Unpin for PossibleValuesParser
impl UnwindSafe for PossibleValuesParser
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<I> IntoResettable<ValueParser> for Iwhere
I: Into<ValueParser>,
impl<I> IntoResettable<ValueParser> for Iwhere
I: Into<ValueParser>,
source§fn into_resettable(self) -> Resettable<ValueParser>
fn into_resettable(self) -> Resettable<ValueParser>
Convert to the intended resettable type