# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import print_function

import six

from paddle.fluid import core
import paddle


def delete_ops(block, ops):
    for op in ops:
        try:
            idx = list(block.ops).index(op)
            block._remove_op(idx)
        except Exception as e:
            print(e)


def find_op_by_input_arg(block, arg_name):
    for index, op in enumerate(block.ops):
        if arg_name in op.input_arg_names:
            return index
    return -1


def find_op_by_output_arg(block, arg_name, reverse=False):
    if reverse:
        pos = len(block.ops) - 1
        while pos >= 0:
            op = block.ops[pos]
            if arg_name in op.output_arg_names:
                return pos
            pos -= 1
    else:
        for index, op in enumerate(block.ops):
            if arg_name in op.output_arg_names:
                return index
    return -1