110 lines
3.1 KiB
Python
Executable File
110 lines
3.1 KiB
Python
Executable File
#!/usr/bin/python
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# requires python-pyparsing module
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# http://pyparsing.sourceforge.net/
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from pyparsing import Word, alphanums, alphas, nums, oneOf, restOfLine, OneOrMore, \
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ParseResults, Forward, Combine, Or, Optional,MatchFirst, \
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ZeroOrMore, StringEnd, LineEnd, delimitedList, Group, Literal
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import Term
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def ifParse (str):
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# Tokens
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lbr = Literal("(").suppress()
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rbr = Literal(")").suppress()
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com = Literal(",").suppress()
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hash = Literal("#").suppress()
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equ = Literal("=").suppress()
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implies = Literal("=>").suppress()
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# Functions to construct tuples etc
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def bracket(x):
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return lbr + x + rbr
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def ntup(n):
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x = Message
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while n > 1:
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x = x + com + Message
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n = n - 1
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return x
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def btup(n):
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return bracket(ntup(n))
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def funcy(x,y):
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return x + bracket(y)
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def ftup(x,n):
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return funcy(x, ntup(n))
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# Message section
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Alfabet= alphas+nums+"_$"
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Variable = Word("x",Alfabet).setParseAction(lambda s,l,t: [ Term.TermVariable(t[0],None) ])
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Constant = Word(alphas,Alfabet).setParseAction(lambda s,l,t: [ Term.TermConstant(t[0]) ])
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Number = Word(nums).setParseAction(lambda s,l,t: [ Term.TermConstant(t[0]) ])
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Basic = MatchFirst([ Variable, Constant, Number ])
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Message = Forward()
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def parseType(s,l,t):
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term = t[0][1]
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term.setType(t[0][0])
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return [term]
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TypeInfo = oneOf ("mr nonce pk sk fu table").setParseAction(lambda s,l,t: [ Term.TermConstant(t[0]) ])
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TypeMsg = Group(TypeInfo + lbr + Message + rbr).setParseAction(parseType)
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def parseCrypt(s,l,t):
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# Crypto types are ignored for now
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return [Term.TermEncrypt(t[0][2],t[0][1])]
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CryptOp = oneOf ("crypt scrypt c funct rcrypt tb")
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CryptMsg = Group(CryptOp + lbr + Message + com + Message + rbr).setParseAction(parseCrypt)
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def parseSMsg(s,l,t):
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return [Term.TermEncrypt(t[0][1],Term.Termconstant("succ") )]
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SMsg = Group(Literal("s") + lbr + Message + rbr)
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def parsePrime(s,l,t):
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# for now, we simply ignore the prime (')
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return [t[0][0]]
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Message << Group(Or ([TypeMsg, CryptMsg, SMsg, Basic]) + Optional(Literal("'"))).setParseAction(parsePrime)
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# Fact section
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Request = Group("request" + btup(4))
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Witness = Group("witness" + btup(4))
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Give = Group("give" + lbr + Message + com + ftup(Literal("f"),
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1) + rbr)
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Secret = Group("secret" + lbr + Message + com +
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ftup(Literal("f"),1) + rbr)
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TimeFact = Group(ftup (Literal("h"), 1))
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IntruderKnowledge = Group(ftup (Literal("i"), 1))
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MessageFact = Group(ftup(Literal("m"),6))
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Principal = Group(ftup(Literal("w"), 7))
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Fact = Principal | MessageFact | IntruderKnowledge | TimeFact | Secret | Give | Witness | Request
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#State = Fact + OptioZeroOrMore ("." + Fact)
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State = Group(delimitedList (Fact, "."))
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# Rules and labels
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rulename = Word (alphanums + "_")
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rulecategory = oneOf("Protocol_Rules Invariant_Rules Decomposition_Rules Intruder_Rules Init Goal")
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label = hash + "lb" + equ + rulename + com + "type" + equ + rulecategory
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rule = Group(State + Optional(implies + State))
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labeledrule = Group(label + rule)
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typeflag = hash + "option" + equ + oneOf ("untyped","typed")
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# A complete file
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iffile = typeflag + Group(OneOrMore(labeledrule))
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parser = iffile
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parser.ignore("##" + restOfLine)
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return parser.parseString(str)
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