text: # Copyright 2018 the V8 project authors. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  import difflib
  
  from . import base
  
  
  class OutProc(base.OutProc):
    def __init__(self, expected_outcomes, expected_path):
      super(OutProc, self).__init__(expected_outcomes)
      self._expected_path = expected_path
  
    def _is_failure_output(self, output):
      with open(self._expected_path) as f:
        expected = f.read()
      expected_lines = expected.splitlines()
      actual_lines = output.stdout.splitlines()
      diff = difflib.unified_diff(expected_lines, actual_lines, lineterm="",
                                  fromfile="expected_path")
      diffstring = '\n'.join(diff)
      if diffstring != "":
        if "generated from a non-shipping build" in output.stdout:
          return False
        if not "generated from a shipping build" in output.stdout:
          output.stdout = "Unexpected output:\n\n" + output.stdout
          return True
        output.stdout = diffstring
        return True
      return False
  