From a3c39206a35e4ecf867a368108afe7002d8b4d17 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Fri, 22 Dec 2023 22:23:01 +0200
Subject: Day 22 parsing

---
 2023/src/bin/day_22.rs | 44 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 7 deletions(-)

(limited to '2023/src/bin')

diff --git a/2023/src/bin/day_22.rs b/2023/src/bin/day_22.rs
index b3a610b..3619b83 100644
--- a/2023/src/bin/day_22.rs
+++ b/2023/src/bin/day_22.rs
@@ -1,19 +1,49 @@
-use nom::IResult;
+use nalgebra::Point3;
+use nom::{
+    bytes::complete::tag,
+    character::complete::{line_ending, u32},
+    combinator::map,
+    multi::separated_list1,
+    sequence::{separated_pair, tuple},
+    IResult,
+};
 use std::fs;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let input = fs::read_to_string("inputs/day_2.txt")?;
-    let parsed = Example::parser(&input).unwrap().1;
+    let input = fs::read_to_string("inputs/day_22.txt")?;
+    let parsed = BrickPile::parser(&input).unwrap().1;
     dbg!(&parsed);
 
     Ok(())
 }
 
 #[derive(Debug)]
-struct Example;
+struct BrickPile(Vec<Brick>);
 
-impl Example {
-    fn parser(_input: &str) -> IResult<&str, Self> {
-        todo!()
+#[derive(Debug)]
+struct Brick {
+    a: Point3<u32>,
+    b: Point3<u32>,
+}
+
+impl BrickPile {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(separated_list1(line_ending, Brick::parser), BrickPile)(input)
+    }
+}
+
+impl Brick {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            separated_pair(point_parser, tag("~"), point_parser),
+            |(a, b)| Brick { a, b },
+        )(input)
     }
 }
+
+fn point_parser(input: &str) -> IResult<&str, Point3<u32>> {
+    map(
+        tuple((u32, tag(","), u32, tag(","), u32)),
+        |(x, _, y, _, z)| Point3::new(x, y, z),
+    )(input)
+}
-- 
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