Trait clap::Parser

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pub trait Parser: Sized + FromArgMatches + CommandFactory {
    // Provided methods
    fn parse() -> Self { ... }
    fn try_parse() -> Result<Self, Error> { ... }
    fn parse_from<I, T>(itr: I) -> Self
       where I: IntoIterator<Item = T>,
             T: Into<OsString> + Clone { ... }
    fn try_parse_from<I, T>(itr: I) -> Result<Self, Error>
       where I: IntoIterator<Item = T>,
             T: Into<OsString> + Clone { ... }
    fn update_from<I, T>(&mut self, itr: I)
       where I: IntoIterator<Item = T>,
             T: Into<OsString> + Clone { ... }
    fn try_update_from<I, T>(&mut self, itr: I) -> Result<(), Error>
       where I: IntoIterator<Item = T>,
             T: Into<OsString> + Clone { ... }
}
Expand description

Parse command-line arguments into Self.

The primary one-stop-shop trait used to create an instance of a clap Command, conduct the parsing, and turn the resulting ArgMatches back into concrete instance of the user struct.

This trait is primarily a convenience on top of FromArgMatches + CommandFactory which uses those two underlying traits to build the two fundamental functions parse which uses the std::env::args_os iterator, and parse_from which allows the consumer to supply the iterator (along with fallible options for each).

See also Subcommand and Args.

NOTE: Deriving requires the derive feature flag

Provided Methods§

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fn parse() -> Self

Parse from std::env::args_os(), exit on error.

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fn try_parse() -> Result<Self, Error>

Parse from std::env::args_os(), return Err on error.

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fn parse_from<I, T>(itr: I) -> Self
where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Parse from iterator, exit on error.

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fn try_parse_from<I, T>(itr: I) -> Result<Self, Error>
where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Parse from iterator, return Err on error.

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fn update_from<I, T>(&mut self, itr: I)
where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Update from iterator, exit on error.

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fn try_update_from<I, T>(&mut self, itr: I) -> Result<(), Error>
where I: IntoIterator<Item = T>, T: Into<OsString> + Clone,

Update from iterator, return Err on error.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl<T> Parser for Box<T>
where T: Parser,

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fn parse() -> Box<T>

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fn try_parse() -> Result<Box<T>, Error>

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fn parse_from<I, It>(itr: I) -> Box<T>
where I: IntoIterator<Item = It>, It: Into<OsString> + Clone,

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fn try_parse_from<I, It>(itr: I) -> Result<Box<T>, Error>
where I: IntoIterator<Item = It>, It: Into<OsString> + Clone,

Implementors§