Trait clap::builder::TypedValueParser

pub trait TypedValueParser: Clone + Send + Sync + 'static {
    type Value;
    fn parse_ref(
        &self, 
        cmd: &Command<'_>, 
        arg: Option<&Arg<'_>>, 
        value: &OsStr
    ) -> Result<Self::Value, Error>;

    fn parse(
        &self, 
        cmd: &Command<'_>, 
        arg: Option<&Arg<'_>>, 
        value: OsString
    ) -> Result<Self::Value, Error> { ... }
    fn possible_values(
        &self
    ) -> Option<Box<dyn Iterator<Item = PossibleValue<'static>>>> { ... }
}

Parse/validate argument values

Associated Types

type Value

Argument’s value type

Required methods

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

Parse the argument value

When arg is None, an external subcommand value is being parsed.

Provided methods

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

Parse the argument value

When arg is None, an external subcommand value is being parsed.

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

Reflect on enumerated value properties

Error checking should not be done with this; it is mostly targeted at user-facing applications like errors and completion.

Implementors

impl TypedValueParser for BoolValueParser

type Value = bool

impl TypedValueParser for BoolishValueParser

type Value = bool

impl TypedValueParser for FalseyValueParser

type Value = bool

impl TypedValueParser for NonEmptyStringValueParser

type Value = String

impl TypedValueParser for OsStringValueParser

type Value = OsString

impl TypedValueParser for PathBufValueParser

type Value = PathBuf

impl TypedValueParser for PossibleValuesParser

type Value = String

impl TypedValueParser for StringValueParser

type Value = String

impl<E: ValueEnum + Clone + Send + Sync + 'static> TypedValueParser for EnumValueParser<E>

type Value = E

impl<F, T, E> TypedValueParser for F where
    F: Fn(&str) -> Result<T, E> + Clone + Send + Sync + 'static,
    E: Into<Box<dyn Error + Send + Sync + 'static>>, 

type Value = T

impl<T: TryFrom<i64> + Clone + Send + Sync + 'static> TypedValueParser for RangedI64ValueParser<T> where
    <T as TryFrom<i64>>::Error: Send + Sync + 'static + Error + ToString, 

type Value = T

impl<T: TryFrom<u64> + Clone + Send + Sync + 'static> TypedValueParser for RangedU64ValueParser<T> where
    <T as TryFrom<u64>>::Error: Send + Sync + 'static + Error + ToString, 

type Value = T