# Copyright (c) OpenMMLab. All rights reserved.
import ast


class RemoveAssignFromAST(ast.NodeTransformer):
    """Remove Assign node if the target's name match the key.

    Args:
        key (str): The target name of the Assign node.
    """

    def __init__(self, key):
        self.key = key

    def visit_Assign(self, node):
        if (isinstance(node.targets[0], ast.Name)
                and node.targets[0].id == self.key):
            return None
        else:
            return node