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import abc
import copy
import random
from functools import total_ordering
import pyparsing as pp
from . import base
@total_ordering
class _Action(base.Token):
"""
An action that operates on the raw data stream of the message. All
actions have one thing in common: an offset that specifies where the
action should take place.
"""
def __init__(self, offset):
self.offset = offset
def resolve(self, settings, msg):
"""
Resolves offset specifications to a numeric offset. Returns a copy
of the action object.
"""
c = copy.copy(self)
l = msg.length(settings)
if c.offset == "r":
c.offset = random.randrange(l)
elif c.offset == "a":
c.offset = l + 1
return c
def __lt__(self, other):
return self.offset < other.offset
def __eq__(self, other):
return self.offset == other.offset
def __repr__(self):
return self.spec()
@abc.abstractmethod
def spec(self): # pragma: no cover
pass
@abc.abstractmethod
def intermediate(self, settings): # pragma: no cover
pass
class PauseAt(_Action):
unique_name = None
def __init__(self, offset, seconds):
_Action.__init__(self, offset)
self.seconds = seconds
@classmethod
def expr(cls):
e = pp.Literal("p").suppress()
e += base.TokOffset
e += pp.Literal(",").suppress()
e += pp.MatchFirst(
[
base.v_integer,
pp.Literal("f")
]
)
return e.setParseAction(lambda x: cls(*x))
def spec(self):
return "p%s,%s" % (self.offset, self.seconds)
def intermediate(self, settings):
return (self.offset, "pause", self.seconds)
def freeze(self, settings_):
return self
class DisconnectAt(_Action):
def __init__(self, offset):
_Action.__init__(self, offset)
@classmethod
def expr(cls):
e = pp.Literal("d").suppress()
e += base.TokOffset
return e.setParseAction(lambda x: cls(*x))
def spec(self):
return "d%s" % self.offset
def intermediate(self, settings):
return (self.offset, "disconnect")
def freeze(self, settings_):
return self
class InjectAt(_Action):
unique_name = None # type: ignore
def __init__(self, offset, value):
_Action.__init__(self, offset)
self.value = value
@classmethod
def expr(cls):
e = pp.Literal("i").suppress()
e += base.TokOffset
e += pp.Literal(",").suppress()
e += base.TokValue
return e.setParseAction(lambda x: cls(*x))
def spec(self):
return "i%s,%s" % (self.offset, self.value.spec())
def intermediate(self, settings):
return (
self.offset,
"inject",
self.value.get_generator(settings)
)
def freeze(self, settings):
return InjectAt(self.offset, self.value.freeze(settings))
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