def check_action()

in textworld/generator/chaining.py [0:0]

• 22 lines of code
• 12 McCabe index (conditional complexity)

    def check_action(self, node: _Node, state: State, action: Action) -> bool:
        # Find the last action before a navigation action
        # TODO: Fold this behaviour into ChainingOptions.check_action()
        nav_parent = node
        while nav_parent.action is not None and self._is_navigation(nav_parent.action):
            # HACK: Going through a door is always considered navigation unless the previous action was to open that door.
            parent = nav_parent.parent
            if parent.action is not None and parent.action.name == "open/d":
                break
            if self.backward and action.name == "close/d":
                break
            nav_parent = parent

        if nav_parent.action is not None and not self._is_navigation(action):
            if self.backward:
                recent = action.inverse()
                pre_navigation = recent
                post_navigation = nav_parent.action.inverse()
            else:
                recent = node.action
                pre_navigation = nav_parent.action
                post_navigation = action

            relevant = set(post_navigation.preconditions)

            if len(recent.added & relevant) == 0 or len(pre_navigation.added & relevant) == 0:
                return False

        return self.options.check_action(state, action)