text: # Copyright 2017 Mycroft AI Inc.
  #
  # 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.
  #
  import subprocess
  
  from mycroft.tts import TTS, TTSValidator
  
  
  class ESpeak(TTS):
      def __init__(self, lang, voice):
          super(ESpeak, self).__init__(lang, voice, ESpeakValidator(self))
  
      def execute(self, sentence, ident=None):
          self.begin_audio()
          subprocess.call(
              ['espeak', '-v', self.lang + '+' + self.voice, sentence])
          self.end_audio()
  
  
  class ESpeakValidator(TTSValidator):
      def __init__(self, tts):
          super(ESpeakValidator, self).__init__(tts)
  
      def validate_lang(self):
          # TODO
          pass
  
      def validate_connection(self):
          try:
              subprocess.call(['espeak', '--version'])
          except:
              raise Exception(
                  'ESpeak is not installed. Run: sudo apt-get install espeak')
  
      def get_tts_class(self):
          return ESpeak
  