Day 07 parsing

Author: Cadiac

aoc-solver/src/y2023/day05.rs

@@ -305,9 +305,6 @@ mod tests {
 
     #[test]
     fn it_solves_part2_real_input() {
-        assert_eq!(
-            Day05.part_2(include_str!("../../../inputs/2023/day05.txt")),
-            Ok(26829166)
-        );
+        assert_eq!(Day05.part_2(Day05.default_input()), Ok(26829166));
     }
 }

aoc-solver/src/y2023/day07.rs

@@ -0,0 +1,104 @@
+use std::collections::HashMap;
+
+use crate::solution::{AocError, Solution};
+
+pub struct Day07;
+
+#[derive(Debug, Clone)]
+struct Card {}
+
+type Hand = [u8; 5];
+
+fn parse(input: &str) -> Result<Vec<(Hand, u32)>, AocError> {
+    let card_scores: HashMap<char, u8> = [
+        'A', 'K', 'Q', 'J', 'T', '9', '8', '7', '6', '5', '4', '3', '2',
+    ]
+    .into_iter()
+    .rev()
+    .enumerate()
+    .map(|(score, card)| (card, score as u8))
+    .collect();
+
+    let hands = input
+        .trim()
+        .lines()
+        .map(|line| {
+            let (hand_str, bid_str) = line
+                .split_once(' ')
+                .ok_or(AocError::parse(line, "Invalid line"))?;
+
+            let hand = parse_cards(hand_str, &card_scores)?;
+            let bid = parse_number(bid_str)?;
+
+            Ok((hand, bid))
+        })
+        .collect::<Result<_, _>>()?;
+
+    Ok(hands)
+}
+
+fn parse_cards(cards: &str, card_scores: &HashMap<char, u8>) -> Result<Hand, AocError> {
+    cards
+        .chars()
+        .take(5)
+        .map(|card| {
+            card_scores
+                .get(&card)
+                .copied()
+                .ok_or(AocError::parse(card, "Unknown card"))
+        })
+        .collect::<Result<Vec<_>, AocError>>()?
+        .try_into()
+        .map_err(|_| AocError::parse(cards, "Wrong number of cards"))
+}
+
+fn parse_number(number: &str) -> Result<u32, AocError> {
+    number
+        .parse()
+        .map_err(|_| AocError::parse(number, "Error parsing number"))
+}
+
+fn score_hand(hand: Hand) -> u32 {
+    todo!()
+}
+
+impl Solution for Day07 {
+    type F = u32;
+    type S = u32;
+
+    fn default_input(&self) -> &'static str {
+        include_str!("../../../inputs/2023/day07.txt")
+    }
+
+    fn part_1(&self, input: &str) -> Result<u32, AocError> {
+        let total_winnings = parse(input)?
+            .into_iter()
+            .map(|(hand, bid)| score_hand(hand) * bid)
+            .sum();
+
+        Ok(total_winnings)
+    }
+
+    fn part_2(&self, input: &str) -> Result<u32, AocError> {
+        unimplemented!();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_solves_part1_example() {
+        assert_eq!(
+            Day07.part_1(
+                "32T3K 765\n\
+                 T55J5 684\n\
+                 KK677 28\n\
+                 KTJJT 220\n\
+                 QQQJA 483\n"
+            ),
+            Ok(6440)
+        );
+    }
+}

aoc-solver/src/y2023/mod.rs

@@ -6,8 +6,9 @@ pub mod day03;
 pub mod day04;
 pub mod day05;
 pub mod day06;
+pub mod day07;
 
-pub const MAX_DAYS: u8 = 6;
+pub const MAX_DAYS: u8 = 7;
 
 pub struct Y2023;
 
@@ -20,6 +21,7 @@ impl Solver for Y2023 {
             4 => day04::Day04.run(input, 4, 2023),
             5 => day05::Day05.run(input, 5, 2023),
             6 => day06::Day06.run(input, 6, 2023),
+            7 => day06::Day06.run(input, 7, 2023),
             _ => vec![String::from("Solution not implemented (yet?)")],
         }
     }
@@ -43,6 +45,7 @@ impl Solver for Y2023 {
             4 => include_str!("./day04.rs"),
             5 => include_str!("./day05.rs"),
             6 => include_str!("./day06.rs"),
+            7 => include_str!("./day07.rs"),
             _ => unimplemented!(),
         }
     }