readying 2022 to merge

2022/day17/src/main.rs

@@ -0,0 +1,59 @@
+use std::default;
+
+use nom::{branch::alt, bytes::complete::tag, error::Error, Parser};
+
+#[derive(Debug, Clone, Copy)]
+enum Shape {
+    Bar,
+    Plus,
+    El,
+    Staff,
+    Square,
+}
+
+impl Shape {
+    pub fn iter() -> ShapeGenerator {
+        ShapeGenerator::new()
+    }
+}
+
+struct ShapeGenerator {
+    last_shape: Shape,
+}
+impl ShapeGenerator {
+    fn new() -> Self {
+        Self {
+            last_shape: Shape::Square,
+        }
+    }
+}
+
+impl Iterator for ShapeGenerator {
+    type Item = Shape;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.last_shape = match self.last_shape {
+            Shape::Bar => Shape::Plus,
+            Shape::Plus => Shape::El,
+            Shape::El => Shape::Staff,
+            Shape::Staff => Shape::Square,
+            Shape::Square => Shape::Bar,
+        };
+        Some(self.last_shape)
+    }
+}
+
+enum Jet {
+    Left,
+    Right,
+}
+
+impl<'a> Parser<&'a str, Self, Error<&'a str>> for Jet {
+    fn parse(&mut self, input: &'a str) -> nom::IResult<&'a str, Self, Error<&'a str>> {
+        alt((tag("<").map(|_| Self::Left), tag(">").map(|_| Self::Right)))(input)
+    }
+}
+fn main() {
+    let shapes = Shape::iter().take(10).collect::<Vec<_>>();
+    println!("{shapes:#?}");
+}