Struct clap::builder::FalseyValueParser
source · #[non_exhaustive]pub struct FalseyValueParser {}
Expand description
Parse false-like string values, everything else is true
See also:
ValueParser::bool
for assuming non-false is trueBoolishValueParser
for different human readable bool representations
Example
Usage:
let mut cmd = clap::Command::new("raw")
.arg(
clap::Arg::new("append")
.value_parser(clap::builder::FalseyValueParser::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::FalseyValueParser::new();
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).unwrap(), true);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("100")).unwrap(), true);
assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).unwrap(), false);
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§
Trait Implementations§
source§impl Clone for FalseyValueParser
impl Clone for FalseyValueParser
source§fn clone(&self) -> FalseyValueParser
fn clone(&self) -> FalseyValueParser
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 FalseyValueParser
impl Debug for FalseyValueParser
source§impl Default for FalseyValueParser
impl Default for FalseyValueParser
source§impl TypedValueParser for FalseyValueParser
impl TypedValueParser for FalseyValueParser
source§fn parse_ref(
&self,
cmd: &Command<'_>,
_arg: Option<&Arg<'_>>,
value: &OsStr
) -> Result<Self::Value, Error>
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<'static>> + '_>>
fn possible_values(
&self
) -> Option<Box<dyn Iterator<Item = PossibleValue<'static>> + '_>>
Reflect on enumerated value properties Read more