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use std::{error, fmt, str::FromStr};
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum SortOrder {
Unknown,
Unsorted,
QueryName,
Coordinate,
}
impl AsRef<str> for SortOrder {
fn as_ref(&self) -> &str {
match self {
Self::Unknown => "unknown",
Self::Unsorted => "unsorted",
Self::QueryName => "queryname",
Self::Coordinate => "coordinate",
}
}
}
impl Default for SortOrder {
fn default() -> Self {
Self::Unknown
}
}
impl fmt::Display for SortOrder {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_ref())
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum ParseError {
Empty,
Invalid,
}
impl error::Error for ParseError {}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Empty => f.write_str("empty input"),
Self::Invalid => f.write_str("invalid input"),
}
}
}
impl FromStr for SortOrder {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"" => Err(ParseError::Empty),
"unknown" => Ok(Self::Unknown),
"unsorted" => Ok(Self::Unsorted),
"queryname" => Ok(Self::QueryName),
"coordinate" => Ok(Self::Coordinate),
_ => Err(ParseError::Invalid),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_default() {
assert_eq!(SortOrder::default(), SortOrder::Unknown);
}
#[test]
fn test_fmt() {
assert_eq!(SortOrder::Unknown.to_string(), "unknown");
assert_eq!(SortOrder::Unsorted.to_string(), "unsorted");
assert_eq!(SortOrder::QueryName.to_string(), "queryname");
assert_eq!(SortOrder::Coordinate.to_string(), "coordinate");
}
#[test]
fn test_from_str() {
assert_eq!("unknown".parse(), Ok(SortOrder::Unknown));
assert_eq!("unsorted".parse(), Ok(SortOrder::Unsorted));
assert_eq!("queryname".parse(), Ok(SortOrder::QueryName));
assert_eq!("coordinate".parse(), Ok(SortOrder::Coordinate));
assert_eq!("".parse::<SortOrder>(), Err(ParseError::Empty));
assert_eq!("noodles".parse::<SortOrder>(), Err(ParseError::Invalid));
assert_eq!("QueryName".parse::<SortOrder>(), Err(ParseError::Invalid));
}
}