Initial commit - fix problems & refactor code

core/evaluator/utils/getFirstN.py

@@ -0,0 +1,32 @@
+from typing import Any
+from core.primitives.list import cons, car, cdr, NIL
+from core.exceptions import syntaxError
+from core.printer import Representation
+
+def getFirstN(_list: Any, n: int) -> list[Any]:
+    """Get first N elements.
+
+    Args:
+        _list: A list.
+        n: The expected number of elements.
+
+    Returns:
+        A list of the extracted elements.
+
+    Raises:
+        syntaxError: If the list has wrong number of elements.
+    """
+    result: list[Any] = []
+    current: Any = _list
+
+    while current != NIL and len(result) < n:
+        result.append(car(current))
+        current = cdr(current)
+    
+    if current != NIL:
+        raise syntaxError(f"extra elems: {Representation(current)}")
+    
+    if len(result) < n:
+        raise syntaxError("lack of elems")
+    
+    return result