class_docstr: Rule engine to processes rules
class_docstr_tok: ["Rule","engine","to","processes","rules"]
code: def add_publisher(cls, publisher_reference, current_list):
      _publisher = cls.standardize_publisher_name(publisher_reference)
      current_list += [_publisher] if _publisher is not None else []
  
imports: from datetime import datetime, timedelta
  from os import environ
  from streamalert.shared.publisher import AlertPublisherRepository
  from streamalert.rules_engine.alert_forwarder import AlertForwarder
  from streamalert.rules_engine.threat_intel import ThreatIntel
  from streamalert.shared import resources, RULES_ENGINE_FUNCTION_NAME
  from streamalert.shared.alert import Alert
  from streamalert.shared.config import load_config
  from streamalert.shared.importer import import_folders
  from streamalert.shared.logger import get_logger
  from streamalert.shared.lookup_tables.core import LookupTables
  from streamalert.shared.metrics import MetricLogger
  from streamalert.shared.rule import Rule
  from streamalert.shared.rule_table import RuleTable
  from streamalert.shared.stats import RuleStatisticTracker
label_desc: Use image node_id 16 for calling the RulesEngine obj's underlying member method code with example usage: obj.add_publisher(cls, publisher_reference, current_list) without return types