parser_fuzz_test.py 文件源码

def testDefaultParseValueFuzz(self, value):
    try:
      result = parser.DefaultParseValue(value)
    except TypeError:
      # It's OK to get a TypeError if the string has the null character.
      if u'\x00' in value:
        return
      raise
    except MemoryError:
      if len(value) > 100:
        # This is not what we're testing.
        return
      raise

    try:
      uvalue = unicode(value)
      uresult = unicode(result)
    except UnicodeDecodeError:
      # This is not what we're testing.
      return

    # Check that the parsed value doesn't differ too much from the input.
    distance = Levenshtein.distance(uresult, uvalue)
    max_distance = (
        2 +  # Quotes or parenthesis can be implicit.
        sum(c.isspace() for c in value) +
        value.count('"') + value.count("'") +
        3 * (value.count(',') + 1) +  # 'a,' can expand to "'a', "
        3 * (value.count(':')) +  # 'a:' can expand to "'a': "
        2 * value.count('\\'))
    if '#' in value:
      max_distance += len(value) - value.index('#')

    if not isinstance(result, six.string_types):
      max_distance += value.count('0')  # Leading 0s are stripped.

    # Note: We don't check distance for dicts since item order can be changed.
    if '{' not in value:
      self.assertLessEqual(distance, max_distance,
                           (distance, max_distance, uvalue, uresult))