From 3a87c137503984ae1e2314af5ffb462e47f31051 Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Fri, 8 Dec 2023 11:25:00 -0500
Subject: [PATCH] Parse the puzzle input for 2023 day 4

---
 2023/day4/src/main.rs | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/2023/day4/src/main.rs b/2023/day4/src/main.rs
index 47ddaed..529d362 100644
--- a/2023/day4/src/main.rs
+++ b/2023/day4/src/main.rs
@@ -1,8 +1,9 @@
 use std::collections::HashMap;
+use std::iter::FromIterator;
 
 const FILE_STR: &'static str = include_str!("input.txt");
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 struct ScratchCard {
     winning: Vec<usize>,
     chosen: Vec<usize>,
@@ -16,18 +17,36 @@ impl ScratchCard {
 
 type GameMap = HashMap<usize, ScratchCard>;
 
+/// Parse numbers from a line, separated/surrounded by whitespace
+fn parse_num_str(s: &str) -> Vec<usize> {
+    s.split_ascii_whitespace()
+        .filter(|s| s.len() > 0)
+        .map(|s| s.trim())
+        .map(|s| usize::from_str_radix(s, 10).unwrap())
+        .collect::<Vec<usize>>()
+}
+
+fn parse_game_table_line(line: &str) -> (usize, ScratchCard) {
+    let parts: Vec<&str> = line.split(": ").collect();
+    let card_num_parts = parts[0].replace("Card", "");
+    let card_num = parse_num_str(&card_num_parts)[0];
+    let nums: Vec<Vec<usize>> = parts[1].split(" | ").map(parse_num_str).collect();
+
+    (card_num, ScratchCard::new(nums[0].clone(), nums[1].clone()))
+}
+
 fn parse_game_table(table: &str) -> GameMap {
-    let mut map = HashMap::new();
-
-    table.split('\n').for_each(|line| {
-        todo!();
-    });
-
-    map
+    HashMap::from_iter(
+        table
+            .split('\n')
+            .filter(|s| s.len() > 0)
+            .map(parse_game_table_line),
+    )
 }
 
 fn part_one() {
-    todo!();
+    let map = parse_game_table(FILE_STR);
+    println!("{:#?}", map);
 }
 
 fn main() {