Integrated ID system, traversing and som signal tests

This merge should solve the implementation part of #2 (closed) and #11 (closed). These might require more tests later on though.

b_asic/basic_operation.py

@@ -5,7 +5,7 @@ TODO: More info.
 
 from b_asic.port import InputPort, OutputPort
 from b_asic.signal import SignalSource, SignalDestination
-from b_asic.operation import OperationId, Operation
+from b_asic.operation import Operation
 from b_asic.simulation import SimulationState, OperationState
 from abc import ABC, abstractmethod
 from typing import List, Dict, Optional, Any
@@ -18,16 +18,14 @@ class BasicOperation(Operation):
 	TODO: More info.
 	"""
 
-	_identifier: OperationId
 	_input_ports: List[InputPort]
 	_output_ports: List[OutputPort]
 	_parameters: Dict[str, Optional[Any]]
 
-	def __init__(self, identifier: OperationId):
+	def __init__(self):
 		"""
 		Construct a BasicOperation.
 		"""
-		self._identifier = identifier
 		self._input_ports = []
 		self._output_ports = []
 		self._parameters = {}
@@ -39,9 +37,6 @@ class BasicOperation(Operation):
 		"""
 		pass
 
-	def identifier(self) -> OperationId:
-		return self._identifier
-
 	def inputs(self) -> List[InputPort]:
 		return self._input_ports.copy()
 
@@ -102,4 +97,13 @@ class BasicOperation(Operation):
 			return results
 		return [self]
 
+	@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]
+
+		return neighbours
+
 	# TODO: More stuff.