introduce bitloops

src/test/java/puzzle/CornerClueTest.java

@@ -48,4 +48,46 @@ public class CornerClueTest {
         assertEquals(1, slots.length);
         assertEquals(4, Masker.Slot.dir(slots[0].key()));
     }
+
+    @Test
+    void testCornerDownLeftSlot() {
+        Clues clues = Clues.createEmpty();
+        // Clue op (0,1), type 5 (Corner Down Left)
+        // Should result in word starting at (0,0) going down.
+        int idx = Masker.offset(0, 1);
+        clues.setClueLo(1L << idx, (byte)5);
+        
+        assertEquals(5, clues.getDir(idx));
+        
+        // Controleer of forEachSlot het slot vindt
+        final boolean[] found = {false};
+        clues.forEachSlot((key, lo, hi) -> {
+            if (Masker.Slot.dir(key) == 5) {
+                found[0] = true;
+                // Woord zou moeten starten op (0,0)
+                int startIdx = Masker.offset(0, 0);
+                assertTrue((lo & (1L << startIdx)) != 0, "Slot should start at (0,0)");
+                // En omlaag gaan
+                int secondIdx = Masker.offset(1, 0);
+                assertTrue((lo & (1L << secondIdx)) != 0, "Slot should continue to (1,0)");
+                
+                // Lengte van het slot zou 8 moeten zijn (van rij 0 t/m 7 in kolom 0)
+                assertEquals(8, Masker.Slot.length(lo, hi));
+            }
+        });
+        assertTrue(found[0], "Corner Down Left slot should be found");
+    }
+
+    @Test
+    void testCornerDownLeftExtraction() {
+        Clues clues = Clues.createEmpty();
+        int idx = Masker.offset(0, 1);
+        clues.setClueLo(1L << idx, (byte)5);
+        
+        DictEntry[] dict = DictData.DICT.index();
+        Slotinfo[] slots = Masker.slots(clues, dict);
+        
+        assertEquals(1, slots.length);
+        assertEquals(5, Masker.Slot.dir(slots[0].key()));
+    }
 }