Add FromStr trait to Point2 and Point3, and change to i64

src/common/geometry.rs

@@ -1,45 +1,56 @@
-#[derive(Hash, PartialEq, Eq, Debug)]
-pub struct Point2(pub u64, pub u64);
+use std::str::FromStr;
+
+#[derive(Hash, PartialEq, Eq, Debug, Copy, Clone)]
+pub struct Point2(pub i64, pub i64);
 
 impl Point2 {
     const POINT_SPLIT_CHAR: char = ',';
 
-    pub fn from_line(line: &str) -> Self {
-        let p: Vec<u64> = line
-            .split(Self::POINT_SPLIT_CHAR)
-            .map(|s| {
-                s.parse()
-                    .expect(&format!("could not create Point2 from line '{line}'"))
-            })
-            .collect();
-        Self(p[0], p[1])
-    }
-
     pub fn rect_area(&self, other: &Self) -> u64 {
         (self.0.abs_diff(other.0) + 1) * (self.1.abs_diff(other.1) + 1)
     }
 }
 
+impl FromStr for Point2 {
+    type Err = ParsePointError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (x_str, y_str) = s
+            .split_once(Self::POINT_SPLIT_CHAR)
+            .ok_or(ParsePointError)?;
+        let x = x_str.parse::<i64>().map_err(|_| ParsePointError)?;
+        let y = y_str.parse::<i64>().map_err(|_| ParsePointError)?;
+        Ok(Self(x, y))
+    }
+}
+
 #[derive(Hash, PartialEq, Eq, Debug)]
-pub struct Point3(pub u64, pub u64, pub u64);
+pub struct Point3(pub i64, pub i64, pub i64);
 
 impl Point3 {
     const POINT_SPLIT_CHAR: char = ',';
 
-    pub fn from_line(line: &str) -> Self {
-        let p: Vec<u64> = line
-            .split(Self::POINT_SPLIT_CHAR)
-            .map(|s| {
-                s.parse()
-                    .expect(&format!("could not create Point3 from line '{line}'"))
-            })
-            .collect();
-        Self(p[0], p[1], p[2])
-    }
-
     pub fn distance_sqr(&self, other: &Self) -> u64 {
         self.0.abs_diff(other.0).pow(2)
             + self.1.abs_diff(other.1).pow(2)
             + self.2.abs_diff(other.2).pow(2)
     }
 }
+
+impl FromStr for Point3 {
+    type Err = ParsePointError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let p = s
+            .split(Self::POINT_SPLIT_CHAR)
+            .map(|s| s.parse::<i64>().map_err(|_| ParsePointError))
+            .collect::<Result<Vec<i64>, Self::Err>>()?;
+        match p.as_slice() {
+            [x, y, z] => Ok(Self(*x, *y, *z)),
+            _ => Err(ParsePointError),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct ParsePointError;

src/solvers/movie_theater.rs

@@ -9,7 +9,7 @@ impl MovieTheater {
     fn red_tiles<R: BufRead>(reader: R) -> Vec<Point2> {
         let mut red_tiles = Vec::new();
         for line in reader.lines().map_while(Result::ok) {
-            red_tiles.push(Point2::from_line(&line));
+            red_tiles.push(line.parse::<Point2>().unwrap());
         }
         red_tiles
     }

src/solvers/playground.rs

@@ -20,7 +20,7 @@ impl Playground {
     fn junction_boxes<R: BufRead>(reader: R) -> Vec<Point3> {
         let mut junction_boxes = Vec::new();
         for line in reader.lines().map_while(Result::ok) {
-            junction_boxes.push(Point3::from_line(&line));
+            junction_boxes.push(line.parse::<Point3>().unwrap());
         }
         junction_boxes
     }