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#!/usr/bin/python
"""
Applies the 'fallback' transformation to Noise patterns.
Authors:
Rhys Weatherley <rhys.weatherley@gmail.com>
This script is placed into the public domain.
"""
import sys
from noise_patterns import *
def combine(list1, list2):
result = list(list1)
for elem in list2:
if not elem in list1:
result.append(elem)
return result
def make_fallback(orig):
pattern = Pattern()
pattern.name = orig.name
pattern.addTransformation('fallback')
direction, first_message = orig.messages[0]
pattern.parameters = combine(first_message, orig.parameters)
pattern.initiator_premessage = first_message + orig.initiator_premessage
pattern.responder_premessage = list(orig.responder_premessage)
pattern.messages = []
for direction, message in orig.messages[1:]:
pattern.messages.append((direction, list(message)))
return pattern
def fallback_compatible(pattern):
direction, messages = pattern.messages[0];
if direction != '->':
return False
if messages == ['e'] or messages == ['e', 's']:
return True
return False
if len(sys.argv) <= 1:
print "Usage: " + sys.argv[0] + " file ..."
sys.exit(1)
for file in sys.argv[1:]:
patterns = loadPatterns(file)
for pattern in patterns:
if not pattern.isInteractive():
# Only interactive patterns can be fallback.
continue
if 'fallback' in pattern.transformations():
# The pattern is already fallback.
continue
if not fallback_compatible(pattern):
# The first message is not fallback-compatible.
continue
fallback = make_fallback(pattern)
print fallback
sys.exit(0)
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