update port maps through Register for Splitter

Author: milanofthe

.DS_Store

@@ -9,6 +9,7 @@
 import numpy as np
 
 from pathsim.blocks.function import Function
+from pathsim.utils.register import Register
 
 
 # BLOCKS ================================================================================
@@ -28,22 +29,23 @@ class Splitter(Function):
         must sum up to one
     """
 
-    #max number of ports
-    _n_in_max = 1
-
-    #maps for input and output port labels
-    _port_map_in = {"in": 0}
-    
     def __init__(self, fractions=None):
 
         self.fractions = np.ones(1) if fractions is None else np.array(fractions)
 
-        #input validation
+        # input validation
         if not np.isclose(sum(self.fractions), 1):
             raise ValueError(f"'fractions' must sum to one and not {sum(self.fractions)}")
 
-        #initialize like `Function` block
+        # initialize like `Function` block
         super().__init__(func=lambda u: self.fractions*u)
 
-        #dynamically define output port map based on fractions
-        self._port_map_out = {f"out {fr}": i for i, fr in enumerate(self.fractions)}
+        # define port maps based on fractions
+        self.inputs = Register(
+            size=1, 
+            mapping={"in": 0}
+            )
+        self.outputs = Register(
+            size=len(self.fractions), 
+            mapping={f"out {fr}": i for i, fr in enumerate(self.fractions)}
+            )