def __init__()

in src/lic/ppl/world/diff_stack.py [0:0]

• 8 lines of code
• 3 McCabe index (conditional complexity)

    def __init__(self, diff: Optional[Diff] = None):
        # diff_stack_ is the list of diffs where the last element is the latest
        # diff added to diff_stack_.
        self.diff_stack_ = []

        # diff_var_ is the set of random variable available in diff stack.
        self.diff_var_ = set()

        # node_to_diffs_ is the dictionary to map node's to the index of the
        # diffs in the diff stack that holds them. This makes node look-up much
        # faster in the diff stack because we no longer need to go look for them
        # in each diff in the diff stack.
        self.node_to_diffs_ = defaultdict(list)

        if diff is None:
            diff = Diff()
        self.add_diff(Diff())

        # diff_ is the latest diff in the diff stack.
        self.diff_ = self.diff_stack_[-1]