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use std::{error, fmt, str::FromStr};
const UNKNOWN: &str = "*";
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum AlternativeLocus {
Region(String, Option<(i32, i32)>),
Unknown,
}
impl fmt::Display for AlternativeLocus {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Region(reference_sequence_name, Some((start, end))) => {
write!(f, "{}:{}-{}", reference_sequence_name, start, end)
}
Self::Region(reference_sequence_name, None) => f.write_str(reference_sequence_name),
Self::Unknown => f.write_str(UNKNOWN),
}
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum ParseError {
Empty,
MissingReferenceSequenceName,
InvalidReferenceSequenceName,
InvalidInterval,
}
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::MissingReferenceSequenceName => f.write_str("missing reference sequence name"),
Self::InvalidReferenceSequenceName => f.write_str("invalid reference sequence name"),
Self::InvalidInterval => f.write_str("invalid interval"),
}
}
}
impl FromStr for AlternativeLocus {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
use crate::record::reference_sequence_name::is_valid_name;
match s {
"" => Err(ParseError::Empty),
UNKNOWN => Ok(Self::Unknown),
_ => {
let mut components = s.splitn(2, ':');
let reference_sequence_name = components
.next()
.ok_or(ParseError::MissingReferenceSequenceName)?;
if !is_valid_name(reference_sequence_name) {
return Err(ParseError::InvalidReferenceSequenceName);
}
let interval = components
.next()
.map(|t| parse_interval(t).map(Some))
.unwrap_or(Ok(None))?;
Ok(Self::Region(reference_sequence_name.into(), interval))
}
}
}
}
fn parse_interval(s: &str) -> Result<(i32, i32), ParseError> {
let mut components = s.splitn(2, '-');
let start = components
.next()
.ok_or(ParseError::InvalidInterval)
.and_then(|t| t.parse().map_err(|_| ParseError::InvalidInterval))?;
let end = components
.next()
.ok_or(ParseError::InvalidInterval)
.and_then(|t| t.parse().map_err(|_| ParseError::InvalidInterval))?;
Ok((start, end))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_fmt() {
assert_eq!(AlternativeLocus::Unknown.to_string(), "*");
assert_eq!(
AlternativeLocus::Region(String::from("sq0"), None).to_string(),
"sq0"
);
assert_eq!(
AlternativeLocus::Region(String::from("sq0"), Some((8, 13))).to_string(),
"sq0:8-13"
);
}
#[test]
fn test_from_str() {
assert_eq!("*".parse(), Ok(AlternativeLocus::Unknown));
assert_eq!(
"sq0".parse(),
Ok(AlternativeLocus::Region(String::from("sq0"), None))
);
assert_eq!(
"sq0:8-13".parse(),
Ok(AlternativeLocus::Region(String::from("sq0"), Some((8, 13))))
);
assert_eq!("".parse::<AlternativeLocus>(), Err(ParseError::Empty));
assert_eq!(
"=".parse::<AlternativeLocus>(),
Err(ParseError::InvalidReferenceSequenceName)
);
}
}