# sfa should not depend on sfatables
# if the sfatables.runtime import fails, just define run_sfatables as identity
-import sys
+
try:
from sfatables.runtime import SFATablesRules
"""
if not context_callback:
context_callback = fetch_context
-
+
chain = chain.upper()
rules = SFATablesRules(chain)
if rules.sorted_rule_list: