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Sanity check transition diagram and fix inconsistencies

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This commit is contained in:
Bert Peters
2023-11-02 22:56:46 +01:00
parent 983bc6af26
commit 8c2c3be40c
1 changed files with 20 additions and 4 deletions
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24
2022/src/day22.rs
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@@ -34,13 +34,13 @@ const TRANSITIONS: [[(Direction, usize, bool); 4]; 6] = [
[ [
(Direction::Right, 1, false), (Direction::Right, 1, false),
(Direction::Down, 2, false), (Direction::Down, 2, false),
(Direction::Left, 3, true), (Direction::Right, 3, true),
(Direction::Right, 5, false), (Direction::Right, 5, false),
], ],
// Square 1 // Square 1
[ [
(Direction::Left, 4, true), (Direction::Left, 4, true),
(Direction::Down, 2, false), (Direction::Left, 2, false),
(Direction::Left, 0, false), (Direction::Left, 0, false),
(Direction::Up, 5, false), (Direction::Up, 5, false),
], ],
@@ -81,7 +81,7 @@ enum Step {
Right, Right,
} }
#[derive(Clone, Copy)] #[derive(Clone, Copy, Debug)]
enum Direction { enum Direction {
Up = 3, Up = 3,
Down = 1, Down = 1,
@@ -319,6 +319,22 @@ mod tests {
#[test] #[test]
fn test_sanity_transitions() { fn test_sanity_transitions() {
// TODO for (cur_face, &face) in TRANSITIONS.iter().enumerate() {
for (dir, (arrive_dir, arrive_face, invert)) in face.into_iter().enumerate() {
let inverse_dir = (arrive_dir as usize + 2) % 4;
let (back_dir, back_face, back_invert) = TRANSITIONS[arrive_face][inverse_dir];
assert_eq!(
invert, back_invert,
"Reciprocal invert failed: face {cur_face} dir {dir} to face {arrive_face} arrives as {arrive_dir:?}"
);
assert_eq!(back_face, cur_face, "Reciprocal transition failed: face {cur_face} dir {dir} arrives at {arrive_face} but returns at {back_face}");
let correct_back_dir = (dir + 2) % 4;
assert_eq!(back_dir as usize, correct_back_dir, "Reciprocal direction failed: face {cur_face} dir {dir} did not arrive the opposite direction from {arrive_face}");
}
}
} }
} }