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use std::{error, fmt, str::FromStr};
use super::{directive, record, Directive, Record};
#[derive(Clone, Debug, PartialEq)]
pub enum Line {
Directive(Directive),
Comment(String),
Record(Record),
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum ParseError {
InvalidDirective(directive::ParseError),
InvalidRecord(record::ParseError),
}
impl error::Error for ParseError {}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::InvalidDirective(e) => write!(f, "{}", e),
Self::InvalidRecord(e) => write!(f, "{}", e),
}
}
}
impl FromStr for Line {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if s.starts_with(directive::PREFIX) {
s.parse()
.map(Self::Directive)
.map_err(ParseError::InvalidDirective)
} else if let Some(t) = s.strip_prefix('#') {
Ok(Self::Comment(t.into()))
} else {
s.parse()
.map(Self::Record)
.map_err(ParseError::InvalidRecord)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_from_str() {
assert_eq!(
"##gff-version 3".parse(),
Ok(Line::Directive(Directive::GffVersion(Default::default())))
);
assert_eq!(
"#format: gff3".parse(),
Ok(Line::Comment(String::from("format: gff3")))
);
assert!(matches!(
"sq0\tNOODLES\tgene\t8\t13\t.\t+\t.\tgene_id=ndls0;gene_name=gene0".parse(),
Ok(Line::Record(_))
));
}
}