kifu/kifu-core/src/types.rs

@@ -112,11 +112,28 @@ impl GameState {
     }
 }
 
+#[derive(Clone, Debug)]
 pub struct Board {
     pub size: Size,
     pub spaces: Vec<Option<Color>>,
 }
 
+impl std::fmt::Display for Board {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+        for row in 0..self.size.height {
+            for column in 0..self.size.width {
+                match self.stone(column, row) {
+                    None => write!(f, " . ")?,
+                    Some(Color::Black) => write!(f, " X ")?,
+                    Some(Color::White) => write!(f, " O ")?,
+                }
+            }
+            writeln!(f, "")?;
+        }
+        Ok(())
+    }
+}
+
 impl Board {
     fn new() -> Self {
         let mut spaces = Vec::new();
@@ -146,3 +163,79 @@ impl Board {
         ((row as usize) * (self.size.width as usize) + (column as usize)) as usize
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    /* Two players (Black and White) take turns and Black plays first
+     * Stones are placed on the line intersections and not moved.
+     * A stone with no liberties is removed from the board.
+     * A group of stones of the same color share liberties.
+     * A stone at the edge of the board has only three liberties.
+     * A stone at the corner of the board has only two liberties.
+     * A stone may not be placed in a suicidal position.
+     * A stone placed in a suicidal position is legal if it captures other stones first.
+     */
+
+    #[test]
+    fn it_shows_stones() {
+        let mut board = Board::new();
+        board.place_stone(3, 2, Color::White);
+        board.place_stone(2, 3, Color::White);
+        board.place_stone(4, 3, Color::White);
+        board.place_stone(3, 3, Color::Black);
+        println!("{}", board);
+        assert!(false);
+    }
+
+    #[test]
+    fn it_counts_individual_liberties() {
+        let mut board = Board::new();
+        board.place_stone(3, 3, Color::White);
+        board.place_stone(0, 3, Color::White);
+        board.place_stone(0, 0, Color::White);
+        println!("{}", board);
+        assert!(false);
+    }
+
+    #[test]
+    fn stones_share_liberties() {
+        let mut board = Board::new();
+        board.place_stone(3, 3, Color::White);
+        board.place_stone(3, 4, Color::White);
+        board.place_stone(3, 5, Color::White);
+        board.place_stone(4, 4, Color::White);
+        println!("{}", board);
+        assert!(false);
+    }
+
+    #[test]
+    fn opposing_stones_reduce_liberties() {
+        let mut board = Board::new();
+        board.place_stone(3, 3, Color::White);
+        board.place_stone(3, 4, Color::Black);
+        println!("{}", board);
+        assert!(false);
+    }
+
+    #[test]
+    fn surrounding_a_stone_remove_it() {
+        assert!(false);
+    }
+
+    #[test]
+    fn sorrounding_a_group_removes_it() {
+        assert!(false);
+    }
+
+    #[test]
+    fn suicide_is_forbidden() {
+        assert!(false);
+    }
+
+    #[test]
+    fn captures_preceed_self_capture() {
+        assert!(false);
+    }
+}