43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
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use yap::Tokens;
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use crate::parsing::{parse_n, parse_number};
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use super::model::TargetArea;
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pub fn parse_target_area(tokens: &mut impl Tokens<Item = char>) -> Option<TargetArea> {
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tokens.optional(|t| {
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if !t.tokens("target area: x=".chars()) {
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return None;
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}
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let x = parse_bounds(t)?;
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if !t.tokens(", y=".chars()) {
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return None;
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}
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let y = parse_bounds(t)?;
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Some(TargetArea(x, y))
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})
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}
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pub fn parse_bounds(tokens: &mut impl Tokens<Item = char>) -> Option<(isize, isize)> {
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tokens.optional(|t| {
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let numbers: Option<[isize; 2]> =
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parse_n(t, |t| parse_number(t), |t| t.tokens("..".chars()));
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numbers.map(|numbers| (numbers[0], numbers[1]))
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})
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}
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#[cfg(test)]
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mod test {
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use yap::IntoTokens;
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use crate::day_17::model::TargetArea;
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const EXAMPLE: &str = "target area: x=20..30, y=-10..-5";
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#[test]
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fn parse_example() {
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let example = super::parse_target_area(&mut EXAMPLE.into_tokens());
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assert_eq!(example, Some(TargetArea((20, 30), (-10, -5))));
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}
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}
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