use std::error;
use std::fmt;
#[derive(PartialEq, Clone, Debug)]
pub enum FlagError {
NotFound,
Undefined,
TypeError,
ValueTypeError,
ArgumentError,
}
impl fmt::Display for FlagError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
FlagError::NotFound => f.write_str("NotFound"),
FlagError::Undefined => f.write_str("Undefined"),
FlagError::TypeError => f.write_str("TypeError"),
FlagError::ValueTypeError => f.write_str("ValueTypeError"),
FlagError::ArgumentError => f.write_str("ArgumentError"),
}
}
}
impl error::Error for FlagError {
fn description(&self) -> &str {
match *self {
FlagError::NotFound => "Flag not found",
FlagError::Undefined => "Flag undefined",
FlagError::TypeError => "Flag type mismatch",
FlagError::ValueTypeError => "Value type mismatch",
FlagError::ArgumentError => "Illegal argument",
}
}
}