def HandleError(self, error):
    code = error.code
    token = error.token

    if self._fix_error_codes and code not in self._fix_error_codes:
      return

    if code == errors.JSDOC_PREFER_QUESTION_TO_PIPE_NULL:
      self._FixJsDocPipeNull(token.attached_object.jstype)

    elif code == errors.JSDOC_MISSING_OPTIONAL_TYPE:
      iterator = token.attached_object.type_end_token
      if iterator.type == Type.DOC_END_BRACE or iterator.string.isspace():
        iterator = iterator.previous

      ending_space = len(iterator.string) - len(iterator.string.rstrip())
      iterator.string = '%s=%s' % (iterator.string.rstrip(),
                                   ' ' * ending_space)

      # Create a new flag object with updated type info.
      token.attached_object = javascriptstatetracker.JsDocFlag(token)
      self._AddFix(token)

    elif code == errors.JSDOC_MISSING_VAR_ARGS_TYPE:
      iterator = token.attached_object.type_start_token
      if iterator.type == Type.DOC_START_BRACE or iterator.string.isspace():
        iterator = iterator.next

      starting_space = len(iterator.string) - len(iterator.string.lstrip())
      iterator.string = '%s...%s' % (' ' * starting_space,
                                     iterator.string.lstrip())

      # Create a new flag object with updated type info.
      token.attached_object = javascriptstatetracker.JsDocFlag(token)
      self._AddFix(token)

    elif code in (errors.MISSING_SEMICOLON_AFTER_FUNCTION,
                  errors.MISSING_SEMICOLON):
      semicolon_token = Token(';', Type.SEMICOLON, token.line,
                              token.line_number)
      tokenutil.InsertTokenAfter(semicolon_token, token)
      token.metadata.is_implied_semicolon = False
      semicolon_token.metadata.is_implied_semicolon = False
      self._AddFix(token)

    elif code in (errors.ILLEGAL_SEMICOLON_AFTER_FUNCTION,
                  errors.REDUNDANT_SEMICOLON,
                  errors.COMMA_AT_END_OF_LITERAL):
      self._DeleteToken(token)
      self._AddFix(token)

    elif code == errors.INVALID_JSDOC_TAG:
      if token.string == '@returns':
        token.string = '@return'
        self._AddFix(token)

    elif code == errors.FILE_MISSING_NEWLINE:
      # This error is fixed implicitly by the way we restore the file
      self._AddFix(token)

    elif code == errors.MISSING_SPACE:
      if error.fix_data:
        token.string = error.fix_data
        self._AddFix(token)
      elif error.position:
        if error.position.IsAtBeginning():
          tokenutil.InsertSpaceTokenAfter(token.previous)
        elif error.position.IsAtEnd(token.string):
          tokenutil.InsertSpaceTokenAfter(token)
        else:
          token.string = error.position.Set(token.string, ' ')
        self._AddFix(token)

    elif code == errors.EXTRA_SPACE:
      if error.position:
        token.string = error.position.Set(token.string, '')
        self._AddFix(token)

    elif code == errors.MISSING_LINE:
      if error.position.IsAtBeginning():
        tokenutil.InsertBlankLineAfter(token.previous)
      else:
        tokenutil.InsertBlankLineAfter(token)
      self._AddFix(token)

    elif code == errors.EXTRA_LINE:
      self._DeleteToken(token)
      self._AddFix(token)

    elif code == errors.WRONG_BLANK_LINE_COUNT:
      if not token.previous:
        # TODO(user): Add an insertBefore method to tokenutil.
        return

      num_lines = error.fix_data
      should_delete = False

      if num_lines < 0:
        num_lines *= -1
        should_delete = True

      for unused_i in xrange(1, num_lines + 1):
        if should_delete:
          # TODO(user): DeleteToken should update line numbers.
          self._DeleteToken(token.previous)
        else:
          tokenutil.InsertBlankLineAfter(token.previous)
        self._AddFix(token)

    elif code == errors.UNNECESSARY_DOUBLE_QUOTED_STRING:
      end_quote = tokenutil.Search(token, Type.DOUBLE_QUOTE_STRING_END)
      if end_quote:
        single_quote_start = Token(
            "'", Type.SINGLE_QUOTE_STRING_START, token.line, token.line_number)
        single_quote_end = Token(
            "'", Type.SINGLE_QUOTE_STRING_START, end_quote.line,
            token.line_number)

        tokenutil.InsertTokenAfter(single_quote_start, token)
        tokenutil.InsertTokenAfter(single_quote_end, end_quote)
        self._DeleteToken(token)
        self._DeleteToken(end_quote)
        self._AddFix([token, end_quote])

    elif code == errors.MISSING_BRACES_AROUND_TYPE:
      fixed_tokens = []
      start_token = token.attached_object.type_start_token

      if start_token.type != Type.DOC_START_BRACE:
        leading_space = (
            len(start_token.string) - len(start_token.string.lstrip()))
        if leading_space:
          start_token = tokenutil.SplitToken(start_token, leading_space)
          # Fix case where start and end token were the same.
          if token.attached_object.type_end_token == start_token.previous:
            token.attached_object.type_end_token = start_token

        new_token = Token('{', Type.DOC_START_BRACE, start_token.line,
                          start_token.line_number)
        tokenutil.InsertTokenAfter(new_token, start_token.previous)
        token.attached_object.type_start_token = new_token
        fixed_tokens.append(new_token)

      end_token = token.attached_object.type_end_token
      if end_token.type != Type.DOC_END_BRACE:
        # If the start token was a brace, the end token will be a
        # FLAG_ENDING_TYPE token, if there wasn't a starting brace then
        # the end token is the last token of the actual type.
        last_type = end_token
        if not fixed_tokens:
          last_type = end_token.previous

        while last_type.string.isspace():
          last_type = last_type.previous

        # If there was no starting brace then a lone end brace wouldn't have
        # been type end token. Now that we've added any missing start brace,
        # see if the last effective type token was an end brace.
        if last_type.type != Type.DOC_END_BRACE:
          trailing_space = (len(last_type.string) -
                            len(last_type.string.rstrip()))
          if trailing_space:
            tokenutil.SplitToken(last_type,
                                 len(last_type.string) - trailing_space)

          new_token = Token('}', Type.DOC_END_BRACE, last_type.line,
                            last_type.line_number)
          tokenutil.InsertTokenAfter(new_token, last_type)
          token.attached_object.type_end_token = new_token
          fixed_tokens.append(new_token)

      self._AddFix(fixed_tokens)

    elif code == errors.LINE_STARTS_WITH_OPERATOR:
      # Remove whitespace following the operator so the line starts clean.
      self._StripSpace(token, before=False)

      # Remove the operator.
      tokenutil.DeleteToken(token)
      self._AddFix(token)

      insertion_point = tokenutil.GetPreviousCodeToken(token)

      # Insert a space between the previous token and the new operator.
      space = Token(' ', Type.WHITESPACE, insertion_point.line,
                    insertion_point.line_number)
      tokenutil.InsertTokenAfter(space, insertion_point)

      # Insert the operator on the end of the previous line.
      new_token = Token(token.string, token.type, insertion_point.line,
                        insertion_point.line_number)
      tokenutil.InsertTokenAfter(new_token, space)
      self._AddFix(new_token)

    elif code == errors.LINE_ENDS_WITH_DOT:
      # Remove whitespace preceding the operator to remove trailing whitespace.
      self._StripSpace(token, before=True)

      # Remove the dot.
      tokenutil.DeleteToken(token)
      self._AddFix(token)

      insertion_point = tokenutil.GetNextCodeToken(token)

      # Insert the dot at the beginning of the next line of code.
      new_token = Token(token.string, token.type, insertion_point.line,
                        insertion_point.line_number)
      tokenutil.InsertTokenBefore(new_token, insertion_point)
      self._AddFix(new_token)

    elif code == errors.GOOG_REQUIRES_NOT_ALPHABETIZED:
      require_start_token = error.fix_data
      sorter = requireprovidesorter.RequireProvideSorter()
      sorter.FixRequires(require_start_token)

      self._AddFix(require_start_token)

    elif code == errors.GOOG_PROVIDES_NOT_ALPHABETIZED:
      provide_start_token = error.fix_data
      sorter = requireprovidesorter.RequireProvideSorter()
      sorter.FixProvides(provide_start_token)

      self._AddFix(provide_start_token)

    elif code == errors.UNNECESSARY_BRACES_AROUND_INHERIT_DOC:
      if token.previous.string == '{' and token.next.string == '}':
        self._DeleteToken(token.previous)
        self._DeleteToken(token.next)
        self._AddFix([token])

    elif code == errors.INVALID_AUTHOR_TAG_DESCRIPTION:
      match = INVERTED_AUTHOR_SPEC.match(token.string)
      if match:
        token.string = '%s%s%s(%s)%s' % (match.group('leading_whitespace'),
                                         match.group('email'),
                                         match.group('whitespace_after_name'),
                                         match.group('name'),
                                         match.group('trailing_characters'))
        self._AddFix(token)

    elif (code == errors.WRONG_INDENTATION and
          not FLAGS.disable_indentation_fixing):
      token = tokenutil.GetFirstTokenInSameLine(token)
      actual = error.position.start
      expected = error.position.length

      # Cases where first token is param but with leading spaces.
      if (len(token.string.lstrip()) == len(token.string) - actual and
          token.string.lstrip()):
        token.string = token.string.lstrip()
        actual = 0

      if token.type in (Type.WHITESPACE, Type.PARAMETERS) and actual != 0:
        token.string = token.string.lstrip() + (' ' * expected)
        self._AddFix([token])
      else:
        # We need to add indentation.
        new_token = Token(' ' * expected, Type.WHITESPACE,
                          token.line, token.line_number)
        # Note that we'll never need to add indentation at the first line,
        # since it will always not be indented.  Therefore it's safe to assume
        # token.previous exists.
        tokenutil.InsertTokenAfter(new_token, token.previous)
        self._AddFix([token])

    elif code in [errors.MALFORMED_END_OF_SCOPE_COMMENT,
                  errors.MISSING_END_OF_SCOPE_COMMENT]:
      # Only fix cases where }); is found with no trailing content on the line
      # other than a comment. Value of 'token' is set to } for this error.
      if (token.type == Type.END_BLOCK and
          token.next.type == Type.END_PAREN and
          token.next.next.type == Type.SEMICOLON):
        current_token = token.next.next.next
        removed_tokens = []
        while current_token and current_token.line_number == token.line_number:
          if current_token.IsAnyType(Type.WHITESPACE,
                                     Type.START_SINGLE_LINE_COMMENT,
                                     Type.COMMENT):
            removed_tokens.append(current_token)
            current_token = current_token.next
          else:
            return

        if removed_tokens:
          self._DeleteTokens(removed_tokens[0], len(removed_tokens))

        whitespace_token = Token('  ', Type.WHITESPACE, token.line,
                                 token.line_number)
        start_comment_token = Token('//', Type.START_SINGLE_LINE_COMMENT,
                                    token.line, token.line_number)
        comment_token = Token(' goog.scope', Type.COMMENT, token.line,
                              token.line_number)
        insertion_tokens = [whitespace_token, start_comment_token,
                            comment_token]

        tokenutil.InsertTokensAfter(insertion_tokens, token.next.next)
        self._AddFix(removed_tokens + insertion_tokens)

    elif code in [errors.EXTRA_GOOG_PROVIDE, errors.EXTRA_GOOG_REQUIRE]:
      tokens_in_line = tokenutil.GetAllTokensInSameLine(token)
      num_delete_tokens = len(tokens_in_line)
      # If line being deleted is preceded and succeed with blank lines then
      # delete one blank line also.
      if (tokens_in_line[0].previous and tokens_in_line[-1].next
          and tokens_in_line[0].previous.type == Type.BLANK_LINE
          and tokens_in_line[-1].next.type == Type.BLANK_LINE):
        num_delete_tokens += 1
      self._DeleteTokens(tokens_in_line[0], num_delete_tokens)
      self._AddFix(tokens_in_line)

    elif code in [errors.MISSING_GOOG_PROVIDE, errors.MISSING_GOOG_REQUIRE]:
      missing_namespaces = error.fix_data[0]
      need_blank_line = error.fix_data[1] or (not token.previous)

      insert_location = Token('', Type.NORMAL, '', token.line_number - 1)
      dummy_first_token = insert_location
      tokenutil.InsertTokenBefore(insert_location, token)

      # If inserting a blank line check blank line does not exist before
      # token to avoid extra blank lines.
      if (need_blank_line and insert_location.previous
          and insert_location.previous.type != Type.BLANK_LINE):
        tokenutil.InsertBlankLineAfter(insert_location)
        insert_location = insert_location.next

      for missing_namespace in missing_namespaces:
        new_tokens = self._GetNewRequireOrProvideTokens(
            code == errors.MISSING_GOOG_PROVIDE,
            missing_namespace, insert_location.line_number + 1)
        tokenutil.InsertLineAfter(insert_location, new_tokens)
        insert_location = new_tokens[-1]
        self._AddFix(new_tokens)

      # If inserting a blank line check blank line does not exist after
      # token to avoid extra blank lines.
      if (need_blank_line and insert_location.next
          and insert_location.next.type != Type.BLANK_LINE):
        tokenutil.InsertBlankLineAfter(insert_location)

      tokenutil.DeleteToken(dummy_first_token)
Retrieve creation and deletion events that happened on
dataset/ETHPy150Open google/closure-linter/closure_linter/error_fixer.py/ErrorFixer.HandleError--crossover with--dataset/ETHPy150Open edgewall/trac/tracopt/versioncontrol/svn/svn_fs.py/SubversionRepository.get_path_history