- Better parsing of multiple branching constructs.
TODO: No handling of loops yet.
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ccremers
parent
21834257a2
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cd8f8db0a8
@ -70,6 +70,15 @@ class MsgList(list):
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for m in self:
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l = l + m.inTerms()
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def __str__(self):
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return "[ " + ", ".join(map(str,self)) + " ]"
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def getList(self):
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l = []
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for e in self:
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l.append(e)
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return l
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class Fact(list):
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def __repr__(self):
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return "Fact<" + list.__repr__(self) + ">"
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@ -210,14 +219,47 @@ class MessageRule(Rule):
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def __init__(self,left=[],right=[]):
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Rule.__init__(self,left,right)
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self.actors = []
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# Add actors
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for fact in self.getFacts():
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actor = fact.getActor()
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if actor != None:
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if actor != None and actor not in self.actors:
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self.actors.append(actor)
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# Read/Send, before/after
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self.readFact = None
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self.before = None
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for fact in self.left:
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if type(fact) == MessageFact:
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self.readFact = fact
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elif type(fact) == PrincipalFact:
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self.before = fact
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self.sendFact = None
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self.after = None
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for fact in self.right:
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if type(fact) == MessageFact:
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self.sendFact = fact
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elif type(fact) == PrincipalFact:
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self.after = fact
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if self.before == None or self.after == None:
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print "Warning: rule does not have both principal facts."
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print self
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def __str__(self):
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return "Message " + Rule.__str__(self)
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def getStepFrom(self):
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if self.before != None:
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return self.before.step
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else:
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return -1
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def getStepTo(self):
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if self.after != None:
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return self.after.step
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else:
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return -1
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class GoalRule(Rule):
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def __str__(self):
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return "Goal " + Rule.__str__(self)
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@ -157,7 +157,7 @@ def ruleParser ():
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MsgList = Forward()
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MsgComp = Literal("c") + lbr + Message + comma + MsgList + rbr
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MsgComp.setParseAction(lambda s,l,t: [ If.MsgList([ t[1] ]) + t[2] ])
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MsgComp.setParseAction(lambda s,l,t: [ If.MsgList([t[1]] + t[2].getList()) ])
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MsgList << Or ([ MsgEtc, Variable, MsgComp ])
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Step = Or ([ Number, Variable ])
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@ -218,7 +218,7 @@ def ruleParser ():
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mr3 = Literal("h") + lbr + Literal("xTime") + rbr + dot + MFPrincipal + Optional(dot + delimitedList(GoalFact, "."))
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MessageRule = Group(mr1) + mr2 + Group(mr3) ## DEVIANT : BNF requires newlines
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MessageRule.setParseAction(lambda s,l,t: [
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If.MessageRule(t[0][3],t[1][2:]) ])
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If.MessageRule(t[0][3:],t[1][2:]) ])
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InitialState = Literal("h") + lbr + Literal("xTime") + rbr + dot + State ## DEVIANT : BNF requires newlines
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InitialState.setParseAction(lambda s,l,t: [ If.InitialRule(t[2]) ])
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@ -5,40 +5,12 @@
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import If
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from misc import *
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def action(protocol, actiontype, rule, fact):
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def action(actiontype, fact):
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res = actiontype + "_"
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res += str(fact.step)
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res += fact.spdl()
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res += ";\n"
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return res
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def processRole(protocol, role):
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res = ""
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print "Role", role
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# initial knowledge
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for rule in protocol:
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if role in rule.getActors():
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for fact in rule.left:
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if type(fact) == If.PrincipalFact:
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print fact
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# derive message sequence
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for rule in protocol:
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if role in rule.getActors():
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for fact in rule.left:
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if type(fact) == If.MessageFact:
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res += action(protocol, "read", rule, fact)
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for fact in rule.right:
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if type(fact) == If.MessageFact:
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res += action(protocol, "send", rule, fact)
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print res
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return ""
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def getRoles(protocol):
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roles = []
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@ -46,12 +18,142 @@ def getRoles(protocol):
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roles += rule.getActors()
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return uniq(roles)
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class Role(object):
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""" Containts a list of rules, to be executed sequentially """
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def __init__(self,name,actor):
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self.name = name
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self.rules = []
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self.actor = actor
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def prependRule(self,rule):
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self.rules = [rule] + self.rules
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def getLength(self):
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return len(self.rules)
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def getFirst(self):
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if self.getLength() > 0:
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return self.rules[0]
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else:
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return None
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def getFirstStep(self):
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return self.getFirst().getStepFrom()
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def getActor(self):
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return self.actor
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def __str__(self):
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res = "Role " + self.name + "\n\n"
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for rule in self.rules:
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res += str(rule)
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res += "\n\n"
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return res
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def spdl(self):
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res = ""
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if len(self.rules) == 0:
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return res
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res += "role " + self.name + " ("
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# TODO Insert parameter agents
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res += ")\n"
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res += "{\n"
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# TODO declare constants, variables
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res += "\n"
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# Message sequence
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res += "\t// Knowledge before: " + str(self.rules[0].before.knowledge) + "\n"
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for rule in self.rules:
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# Read
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if rule.readFact != None:
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res += "\t" + action("read",rule.readFact) + ";\n"
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# Show knowledge extending for this read
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res += "\t// Knowledge delta: " + str(rule.before.runknowledge) + " -> " + str(rule.after.runknowledge) + "\n"
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# Send
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if rule.sendFact != None:
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res += "\t" + action("send",rule.sendFact) + ";\n"
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# TODO claims
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# Close up
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res += "}\n\n"
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return res
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def __cmp__(self,other):
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return cmp(self.name, other.name)
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def extractRoles(protocol):
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""" Extract the roles of a protocol description. This yields a
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list of Role objects """
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# Construct full list of rules to do
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rulestodo = []
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for rule in protocol:
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if type(rule) == If.MessageRule:
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rulestodo.append(rule)
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# Now process them until none are left
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# First, we have no rolenames yet
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rolenames = []
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roles = []
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while len(rulestodo) > 0:
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# Pick one hrule (with the highest step number, maybe)
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highest = rulestodo[0].getStepFrom()
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hrule = rulestodo[0]
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for rule in rulestodo:
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step = rule.getStepFrom()
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step = max(step,rule.getStepTo())
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if step >= highest:
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highest = step
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hrule = rule
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# hrule has been picked. Work back from here
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# first make up a name
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if len(hrule.getActors()) != 1:
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print "Warning: weird actor list for hrule:", hrule.getActors()
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name = "X"
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actor = None
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else:
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actor = hrule.getActors()[0]
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name = str(actor)
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# Remove variable x prefix
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if len(name) > 1 and name[0] == 'x':
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name = name[1:]
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# This name is maybe already taken
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if name in rolenames:
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# Append counter
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counter = 2
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while name + str(counter) in rolenames:
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counter = counter+1
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name = name + str(counter)
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rolenames.append(name)
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role = Role(name,actor)
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roles.append(role)
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# Transfer to rule
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role.prependRule(hrule)
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rulestodo.remove(hrule)
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# Scan for preceding events until none is found
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scan = True
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while scan and role.getFirstStep() != -1:
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scan = False
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for rule in rulestodo:
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if actor in rule.getActors() and rule.getStepTo() == role.getFirstStep():
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# This one works
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role.prependRule(rule)
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rulestodo.remove(rule)
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scan = True
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return roles
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def generator(protocol):
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roles = getRoles(protocol)
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print "Found",len(protocol),"rules."
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print "Roles:", roles
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roles = extractRoles(protocol)
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roles.sort()
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res = ""
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print "Found",len(roles),"roles."
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for role in roles:
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res += processRole(protocol,role)
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res += role.spdl()
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return res
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