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mod matchers;
use std::str;
#[derive(Debug, PartialEq, PartialOrd)]
pub struct TodoItem<'a> {
pub completed: bool,
pub priority: Option<u8>,
pub completed_at: Option<&'a [u8]>,
pub created_at: Option<&'a [u8]>,
pub description: &'a str,
}
impl<'a> TodoItem<'a> {
pub fn parse(src: &'a [u8]) -> Self {
let buffer = src;
let (completed, buffer) = matchers::parse_completed(buffer);
let (priority, buffer) = matchers::parse_priority(buffer);
let (date1, buffer) = matchers::parse_date(buffer);
let (date2, buffer) = match completed {
true => matchers::parse_date(buffer),
false => (None, buffer),
};
let completed_at = match completed {
true => date1,
false => None,
};
let created_at = match completed {
true => date2,
false => date1,
};
let description = str::from_utf8(buffer).unwrap();
TodoItem {
completed,
priority,
completed_at,
created_at,
description,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
macro_rules! parse_sample {
( $val:expr ) => {
TodoItem::parse($val.as_bytes())
};
}
#[test]
fn correctly_handles_two_dates_when_not_completed() {
const DESCRIPTION: &str = "2018-12-31 water cat";
const SAMPLE: &str = "2018-01-01 2018-12-31 water cat";
let expected_date: &[u8] = "2018-01-01".as_bytes();
assert_eq!(parse_sample!(SAMPLE).created_at, Some(expected_date));
assert_eq!(parse_sample!(SAMPLE).description, DESCRIPTION);
}
#[test]
fn correctly_handles_two_dates_when_completed() {
const DESCRIPTION: &str = "water cat";
const SAMPLE: &str = "x 2018-01-01 2018-12-31 water cat";
let expected_completed_date: &[u8] = "2018-01-01".as_bytes();
let expected_created_date: &[u8] = "2018-12-31".as_bytes();
assert_eq!(
parse_sample!(SAMPLE).created_at,
Some(expected_created_date)
);
assert_eq!(
parse_sample!(SAMPLE).completed_at,
Some(expected_completed_date)
);
assert_eq!(parse_sample!(SAMPLE).description, DESCRIPTION);
}
}