src/bin/day1.rs

@@ -3,63 +3,12 @@
 use aoc23::read;
 use chumsky::prelude::*;
 
-struct Line {
+fn parser() -> impl Parser<char, (), Error = Simple<char>> {
-	first_digit: u128,
+	end()
-	last_digit: u128
-}
-
-// thanks rust
-fn array<T, const N: usize>(array: &'static [T; N]) -> &'static [T] {
-	array
-}
-
-impl Line {
-	fn parser() -> impl Parser<char, Self, Error = Simple<char>> {
-		choice((
-			// digit combinations (only the relevant ones)
-			just("oneight").map(|_| array(&[1, 8])),
-			just("twone").map(|_| array(&[2, 1])),
-			just("eightwo").map(|_| array(&[8, 2])),
-			// single digits
-			just("one").or(just("1")).map(|_| array(&[1])),
-			just("two").or(just("2")).map(|_| array(&[2])),
-			just("three").or(just("3")).map(|_| array(&[3])),
-			just("four").or(just("4")).map(|_| array(&[4])),
-			just("five").or(just("5")).map(|_| array(&[5])),
-			just("six").or(just("6")).map(|_| array(&[6])),
-			just("seven").or(just("7")).map(|_| array(&[7])),
-			just("eight").or(just("8")).map(|_| array(&[8])),
-			just("nine").or(just("9")).map(|_| array(&[9])),
-			// garbage
-			none_of(['1', '2', '3', '4', '5', '6', '7', '8', '9', '\n'])
-				.map(|_| array(&[]))
-		))
-		.repeated()
-		.then_ignore(just('\n'))
-		.map(|digits: Vec<&'static [u128]>| {
-			let mut digits = digits.into_iter().flat_map(|array| array.iter().copied());
-			let first_digit = digits.next().expect("No digit in line");
-			let last_digit = digits.last().unwrap_or(first_digit);
-			Line {
-				first_digit,
-				last_digit
-			}
-		})
-	}
-}
-
-fn parser() -> impl Parser<char, Vec<Line>, Error = Simple<char>> {
-	Line::parser().repeated().then_ignore(end())
 }
 
 fn main() -> anyhow::Result<()> {
-	let lines = read("inputs/day1.txt", parser())?;
+	let _ = read("input.txt", parser())?;
-
-	let sum: u128 = lines
-		.iter()
-		.map(|line| line.first_digit * 10 + line.last_digit)
-		.sum();
-	println!("{sum}");
 
 	Ok(())
 }