Resolve "Signal Interface"

Closes #45 (closed)

Restructured Signal Class

b_asic/basic_operation.py

@@ -8,7 +8,7 @@ from typing import List, Dict, Optional, Any
 from numbers import Number
 
 from b_asic.port import InputPort, OutputPort
-from b_asic.signal import SignalSource, SignalDestination
+from b_asic.signal import Signal
 from b_asic.operation import Operation
 from b_asic.simulation import SimulationState, OperationState
 
@@ -73,7 +73,7 @@ class BasicOperation(Operation):
 		while self_state.iteration < state.iteration:
 			input_values: List[Number] = [0] * input_count
 			for i in range(input_count):
-				source: SignalSource = self._input_ports[i].signal().source
+				source: Signal = self._input_ports[i].signal
 				input_values[i] = source.operation.evaluate_outputs(state)[source.port_index]
 
 			self_state.output_values = self.evaluate(input_values)
@@ -81,7 +81,7 @@ class BasicOperation(Operation):
 			self_state.iteration += 1
 			for i in range(output_count):
 				for signal in self._output_ports[i].signals():
-					destination: SignalDestination = signal.destination
+					destination: Signal = signal.destination
 					destination.evaluate_outputs(state)
 
 		return self_state.output_values
@@ -96,9 +96,13 @@ class BasicOperation(Operation):
 	@property
 	def neighbours(self) -> List[Operation]:
 		neighbours: List[Operation] = []
-		for port in self._output_ports + self._input_ports:
-			for signal in port.signals():
-				neighbours += [signal.source.operation, signal.destination.operation]
+		for port in self._input_ports:
+			for signal in port.signals:
+				neighbours.append(signal.source.operation)
+
+		for port in self._output_ports:
+			for signal in port.signals:
+				neighbours.append(signal.destination.operation)
 
 		return neighbours