text: # -*- coding: utf-8 -*-
  # Copyright (C) 2020 Unbabel
  #
  # 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 typing import List
  
  from telescope.metrics.metric import Metric
  from telescope.metrics.sacrebleu.result import BLEUResult
  
  import sacrebleu
  
  
  class sacreBLEU(Metric):
  
      name = "BLEU"
      segment_level = False
  
      def score(self, src: List[str], cand: List[str], ref: List[str]) -> BLEUResult:
          bleu = sacrebleu.corpus_bleu(cand, [ref])
          return BLEUResult(
              bleu.score / 100, [], src, cand, ref, self.name, bleu.precisions, bleu.bp
          )
  