transforms_util.py 文件源码

def is_before(node1, node2):
    """
    checks if definately appears before node2
    """

    current = node2

    while current is not None:
        try:
            if current.parent == node1.parent:
                for field, value in ast.iter_fields(node1.parent):
                    if value == current or value == node1:
                        return False
                    elif isinstance(value, list) and current in value and node1 in value:
                        list_index1 = value.index(node1)
                        list_index2 = value.index(current)
                        if list_index2 > list_index1:
                            return True
        except:
            pass

        current = current.parent
    return False