- Made a start with if2spdl parser.

This commit is contained in:
ccremers 2005-11-16 16:24:18 +00:00
parent e51b54af23
commit 2fe91a2eb1

86
scripts/if2spdl/parser.py Executable file
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#!/usr/bin/python
# requires python-pyparsing module
# http://pyparsing.sourceforge.net/
from pyparsing import Word, alphanums, alphas, nums, oneOf, restOfLine, OneOrMore, \
ParseResults, Forward, Combine, Or, Optional,MatchFirst, \
ZeroOrMore, StringEnd, LineEnd, delimitedList, Group, Literal
def parse (str):
# Tokens
lbr = Literal("(").suppress()
rbr = Literal(")").suppress()
com = Literal(",").suppress()
# Functions to construct tuples etc
def bracket(x):
return lbr + x + rbr
def ntup(n):
x = Message
while n > 1:
x = x + com + Message
n = n - 1
return x
def btup(n):
return bracket(ntup(n))
def funcy(x,y):
return x + bracket(y)
def ftup(x,n):
return funcy(x, ntup(n))
# Message section
Alfabet= alphas+nums+"_$"
Variable = Word("x",Alfabet)
Constant = Word(alphas,Alfabet)
Number = Word(nums)
Basic = MatchFirst([ Variable, Constant, Number ])
Message = Forward()
TypeInfo = oneOf ("mr nonce pk sk fu table")
TypeMsg = TypeInfo + lbr + Message + rbr
CryptOp = oneOf ("crypt scrypt c funct rcrypt tb")
CryptMsg = CryptOp + lbr + Message + com + Message + rbr
SMsg = Literal("s") + lbr + Message + rbr
Message << Or ([TypeMsg, CryptMsg, SMsg, Basic]) + Optional(Literal("'"))
# Fact section
Request = "request" + btup(4)
Witness = "witness" + btup(4)
Give = "give" + lbr + Message + com + ftup(Literal("f"), 1) + rbr
Secret = "secret" + lbr + Message + com + ftup(Literal("f"),1) + rbr
TimeFact = ftup (Literal("h"), 1)
IntruderKnowledge = ftup (Literal("i"), 1)
MessageFact = ftup(Literal("m"),6)
Principal = ftup(Literal("w"), 7)
Fact = Principal | MessageFact | IntruderKnowledge | TimeFact | Secret | Give | Witness | Request
#State = Fact + OptioZeroOrMore ("." + Fact)
State = delimitedList (Fact, ".")
# Rules and labels
rulename = Word (alphanums + "_")
rulecategory = oneOf("Protocol_Rules Invariant_Rules Decomposition_Rules Intruder_Rules Init Goal")
label = "# lb=" + rulename + "," + "type=" + rulecategory
rule = State + Optional("\n" + "=>" + "\n" + State)
labeledrule = Group(label + rule)
typeflag = "# option=" + oneOf ("untyped","typed")
# A complete file
iffile = typeflag + OneOrMore(labeledrule)
parser = iffile
parser.ignore("##" + restOfLine)
return parser.parseString(str)
file = open("NSPK_LOWE.if", "r")
res = parse ("".join(file.readlines() ) )
print res