def random_option(self, option):
self.log_debug(11, 'random_option(%r)', option)
in_sub = in_cat = False
repeat = 1
partial = None
msg = Message()
for item in option:
if isinstance(item, str):
if item == 'repeat': repeat = 1 + randrange(4)
elif item == 'sub': in_sub = True
elif item == 'cat': in_cat = True
elif item == 'optional':
if randrange(3): partial = Message(msg)
else: break
else:
if in_sub:
# Wrapped subexpression
while repeat:
result = self.random_expression(item)
if result:
msg &= result
repeat -= 1
else: return partial
elif in_cat:
# Category name
while repeat:
result = self.random_category(item)
if result:
msg.append(result)
repeat -= 1
else: return partial
else:
# Unwrapped subexpression(s)
while repeat:
result = self.random_expression(item)
if result:
msg.extend(result)
repeat -= 1
else: return partial
in_sub = in_cat = False
repeat = 1
elif isinstance(item, Token):
msg.extend([item] * repeat)
repeat = 1
return msg
