From 355f718208976c5db13e91e48b8ca97a07bf5a94 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Sat, 23 Dec 2023 13:17:53 +0200
Subject: Day 23 parsing

---
 2023/src/bin/day_23.rs | 46 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 7 deletions(-)

(limited to '2023/src/bin/day_23.rs')

diff --git a/2023/src/bin/day_23.rs b/2023/src/bin/day_23.rs
index b3a610b..3a2bd48 100644
--- a/2023/src/bin/day_23.rs
+++ b/2023/src/bin/day_23.rs
@@ -1,19 +1,51 @@
-use nom::IResult;
+use nom::{
+    branch::alt,
+    character::complete::{char, line_ending},
+    combinator::{map, value},
+    multi::{many1, separated_list1},
+    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_23.txt")?;
+    let parsed = ForestMap::parser(&input).unwrap().1;
     dbg!(&parsed);
 
     Ok(())
 }
 
 #[derive(Debug)]
-struct Example;
+struct ForestMap(Vec<Vec<ForestTile>>);
 
-impl Example {
-    fn parser(_input: &str) -> IResult<&str, Self> {
-        todo!()
+#[derive(Debug, Clone)]
+enum ForestTile {
+    Wall,
+    Open,
+    SlopeUp,
+    SlopeDown,
+    SlopeLeft,
+    SlopeRight,
+}
+
+impl ForestMap {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            separated_list1(line_ending, many1(ForestTile::parser)),
+            ForestMap,
+        )(input)
+    }
+}
+
+impl ForestTile {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        alt((
+            value(ForestTile::Wall, char('#')),
+            value(ForestTile::Open, char('.')),
+            value(ForestTile::SlopeUp, char('^')),
+            value(ForestTile::SlopeDown, char('v')),
+            value(ForestTile::SlopeLeft, char('<')),
+            value(ForestTile::SlopeRight, char('>')),
+        ))(input)
     }
 }
-- 
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