From b296156206a9b1bc4473c163bff44e6f2bc95573 Mon Sep 17 00:00:00 2001
From: Federico Igne <git@federicoigne.com>
Date: Sun, 3 Jan 2021 16:48:43 +0000
Subject: [rust] Robot Simulator

---
 rust/robot-simulator/src/lib.rs | 85 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 rust/robot-simulator/src/lib.rs

(limited to 'rust/robot-simulator/src')

diff --git a/rust/robot-simulator/src/lib.rs b/rust/robot-simulator/src/lib.rs
new file mode 100644
index 0000000..d6b6719
--- /dev/null
+++ b/rust/robot-simulator/src/lib.rs
@@ -0,0 +1,85 @@
+// The code below is a stub. Just enough to satisfy the compiler.
+// In order to pass the tests you can add-to or change any of this code.
+
+#[derive(PartialEq, Debug)]
+pub enum Direction {
+    North,
+    East,
+    South,
+    West,
+}
+
+pub struct Robot {
+    x: i32,
+    y: i32,
+    d: Direction,
+}
+
+impl Robot {
+    pub fn new(x: i32, y: i32, d: Direction) -> Self {
+        Robot { x, y, d }
+    }
+
+    pub fn turn_right(self) -> Self {
+        Robot {
+            d: {
+                use Direction::*;
+                match self.d {
+                    North => East,
+                    East => South,
+                    South => West,
+                    West => North,
+                }
+            },
+            ..self
+        }
+    }
+
+    pub fn turn_left(self) -> Self {
+        Robot {
+            d: {
+                use Direction::*;
+                match self.d {
+                    North => West,
+                    East => North,
+                    South => East,
+                    West => South,
+                }
+            },
+            ..self
+        }
+    }
+
+    pub fn advance(self) -> Self {
+        Robot {
+            x: match self.d {
+                Direction::West => self.x - 1,
+                Direction::East => self.x + 1,
+                _ => self.x,
+            },
+            y: match self.d {
+                Direction::North => self.y + 1,
+                Direction::South => self.y - 1,
+                _ => self.y,
+            },
+            ..self
+        }
+    }
+
+    pub fn instructions(self, instructions: &str) -> Self {
+        instructions.chars().fold(self, |acc, action| match action {
+            'A' => acc.advance(),
+            'R' => acc.turn_right(),
+            'L' => acc.turn_left(),
+            _ => acc,
+        })
+    }
+
+    pub fn position(&self) -> (i32, i32) {
+        (self.x, self.y)
+    }
+
+    pub fn direction(&self) -> &Direction {
+        &self.d
+    }
+}
-- 
cgit v1.2.3