[bitboard] Implement From<File>, From<Rank> for BitBoard and TryFrom<BitBoard> for Square

bitboard/src/bitboard.rs

@@ -2,7 +2,7 @@
 
 use crate::library;
 use crate::{LeadingBitScanner, TrailingBitScanner};
-use chessfriend_core::{Color, Direction, Square};
+use chessfriend_core::{Color, Direction, File, Rank, Square};
 use std::fmt;
 use std::ops::Not;
 
@@ -158,6 +158,18 @@ impl Default for BitBoard {
     }
 }
 
+impl From<File> for BitBoard {
+    fn from(value: File) -> Self {
+        library::FILES[*value.as_index() as usize]
+    }
+}
+
+impl From<Rank> for BitBoard {
+    fn from(value: Rank) -> Self {
+        library::FILES[*value.as_index() as usize]
+    }
+}
+
 impl From<Square> for BitBoard {
     fn from(value: Square) -> Self {
         BitBoard(1u64 << value as u32)
@@ -176,6 +188,23 @@ impl FromIterator<Square> for BitBoard {
     }
 }
 
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum TryFromBitBoardError {
+    NotSingleSquare,
+}
+
+impl TryFrom<BitBoard> for Square {
+    type Error = TryFromBitBoardError;
+
+    fn try_from(value: BitBoard) -> Result<Self, Self::Error> {
+        if !value.is_single_square() {
+            return Err(TryFromBitBoardError::NotSingleSquare);
+        }
+
+        unsafe { Ok(Square::from_index(value.0.trailing_zeros() as u8)) }
+    }
+}
+
 impl fmt::Binary for BitBoard {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         // Delegate to u64's implementation of Binary.