Created helpers file for helper classes/functions; added CapabilityStep and CapabilitySequence

shared/workspaces/src/workspaces/helpers.py

+from typing import Optional, List, Iterator
+
+from shared.workspaces.src.workspaces.capability_interfaces import CapabilityStepType
+
+
+class CapabilityStep:
+    """
+    Class that represents a step in a capability sequence. A step is of a certain type and
+    certain step types can have a value
+    """
+    def __init__(self, step_type: CapabilityStepType, step_value: Optional[str]):
+        self.step_type = step_type
+        self.step_value = step_value
+
+    def __str__(self):
+        if self.step_value:
+            return f'{self.step_type.name} {self.step_value}'
+        else:
+            return f'{self.step_type.name}'
+
+
+class CapabilitySequence:
+    """
+    Class that represents a capability sequence with a list of steps
+    """
+    def __init__(self, steps: List[CapabilityStep]):
+        self.steps = steps
+
+    def __iter__(self) -> Iterator:
+        """
+        Allows CapabilitySequence objects to be iterated over
+        :return: Iterator object
+        """
+        return iter(self.steps)
+
+    def __len__(self) -> int:
+        """
+        Allows len() to be called on CapabilitySequence objects
+        :return: Number of capability steps
+        """
+        return len(self.steps)
+
+    def __str__(self) -> str:
+        """
+        Provides a string representation of the object
+        :return: String representation
+        """
+        return ','.join(self)