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68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
#!/usr/bin/env python
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###############################################################################
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# Top contributors (to current version):
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# Yoni Zohar, Aina Niemetz, Mudathir Mohamed
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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) 2009-2022 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
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# sygus solver through the Python API. This is a direct
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# translation of sygus-inv.cpp .
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##
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import utils
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import cvc5
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from cvc5 import Kind
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if __name__ == "__main__":
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slv = cvc5.Solver()
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# required options
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slv.setOption("sygus", "true")
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slv.setOption("incremental", "false")
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# set the logic
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slv.setLogic("LIA")
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integer = slv.getIntegerSort()
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boolean = slv.getBooleanSort()
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zero = slv.mkInteger(0)
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one = slv.mkInteger(1)
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ten = slv.mkInteger(10)
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# declare input variables for functions
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x = slv.mkVar(integer, "x")
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xp = slv.mkVar(integer, "xp")
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# (ite (< x 10) (= xp (+ x 1)) (= xp x))
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ite = slv.mkTerm(Kind.ITE,
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slv.mkTerm(Kind.LT, x, ten),
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slv.mkTerm(Kind.EQUAL, xp, slv.mkTerm(Kind.ADD, x, one)),
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slv.mkTerm(Kind.EQUAL, xp, x))
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# define the pre-conditions, transition relations, and post-conditions
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pre_f = slv.defineFun("pre-f", [x], boolean, slv.mkTerm(Kind.EQUAL, x, zero))
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trans_f = slv.defineFun("trans-f", [x, xp], boolean, ite)
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post_f = slv.defineFun("post-f", [x], boolean, slv.mkTerm(Kind.LEQ, x, ten))
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# declare the invariant-to-synthesize
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inv_f = slv.synthInv("inv-f", [x])
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slv.addSygusInvConstraint(inv_f, pre_f, trans_f, post_f)
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# print solutions if available
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if slv.checkSynth().hasSolution():
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# Output should be equivalent to:
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# (define-fun inv-f ((x Int)) Bool (not (>= x 11)))
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terms = [inv_f]
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utils.print_synth_solutions(terms, slv.getSynthSolutions(terms))
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