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89 lines
2.9 KiB
Python
89 lines
2.9 KiB
Python
#!/usr/bin/env python
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###############################################################################
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# Top contributors (to current version):
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# Makai Mann, Mudathir Mohamed, Andres Noetzli
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#
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# This file is part of the cvc5 project.
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#
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# Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
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# in the top-level source directory and their institutional affiliations.
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# All rights reserved. See the file COPYING in the top-level source
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# directory for licensing information.
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# #############################################################################
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#
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# A simple demonstration of the solving capabilities of the cvc5 strings solver
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# through the Python API. This is a direct translation of strings-new.cpp.
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##
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import pycvc4
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from pycvc4 import kinds
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if __name__ == "__main__":
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slv = pycvc4.Solver()
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# Set the logic
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slv.setLogic("QF_SLIA")
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# Produce models
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slv.setOption("produce-models", "true")
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# The option strings-exp is needed
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slv.setOption("strings-exp", "true")
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# Set output language to SMTLIB2
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slv.setOption("output-language", "smt2")
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# String type
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string = slv.getStringSort()
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# std::string
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str_ab = "ab"
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# String constants
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ab = slv.mkString(str_ab)
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abc = slv.mkString("abc")
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# String variables
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x = slv.mkConst(string, "x")
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y = slv.mkConst(string, "y")
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z = slv.mkConst(string, "z")
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# String concatenation: x.ab.y
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lhs = slv.mkTerm(kinds.StringConcat, x, ab, y)
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# String concatenation: abc.z
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rhs = slv.mkTerm(kinds.StringConcat, abc, z)
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# x.ab.y = abc.z
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formula1 = slv.mkTerm(kinds.Equal, lhs, rhs)
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# Length of y: |y|
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leny = slv.mkTerm(kinds.StringLength, y)
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# |y| >= 0
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formula2 = slv.mkTerm(kinds.Geq, leny, slv.mkInteger(0))
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# Regular expression: (ab[c-e]*f)|g|h
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r = slv.mkTerm(kinds.RegexpUnion,
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slv.mkTerm(kinds.RegexpConcat,
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slv.mkTerm(kinds.StringToRegexp, slv.mkString("ab")),
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slv.mkTerm(kinds.RegexpStar,
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slv.mkTerm(kinds.RegexpRange, slv.mkString("c"), slv.mkString("e"))),
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slv.mkTerm(kinds.StringToRegexp, slv.mkString("f"))),
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slv.mkTerm(kinds.StringToRegexp, slv.mkString("g")),
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slv.mkTerm(kinds.StringToRegexp, slv.mkString("h")))
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# String variables
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s1 = slv.mkConst(string, "s1")
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s2 = slv.mkConst(string, "s2")
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# String concatenation: s1.s2
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s = slv.mkTerm(kinds.StringConcat, s1, s2)
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# s1.s2 in (ab[c-e]*f)|g|h
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formula3 = slv.mkTerm(kinds.StringInRegexp, s, r)
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# Make a query
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q = slv.mkTerm(kinds.And,
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formula1,
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formula2,
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formula3)
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# check sat
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result = slv.checkSatAssuming(q)
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print("CVC4 reports:", q, "is", result)
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if result:
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print("x = ", slv.getValue(x))
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print(" s1.s2 =", slv.getValue(s))
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