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62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
#!/usr/bin/env python
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###############################################################################
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# Top contributors (to current version):
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# Andres Noetzli, Makai Mann, Aina Niemetz
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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) 2009-2024 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 sequences.cpp.
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##
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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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# 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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# Sequence sort
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int_seq = slv.mkSequenceSort(slv.getIntegerSort())
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# Sequence variables
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x = slv.mkConst(int_seq, "x")
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y = slv.mkConst(int_seq, "y")
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# Empty sequence
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empty = slv.mkEmptySequence(slv.getIntegerSort())
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# Sequence concatenation: x.y.empty
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concat = slv.mkTerm(Kind.SEQ_CONCAT, x, y, empty)
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# Sequence length: |x.y.empty|
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concat_len = slv.mkTerm(Kind.SEQ_LENGTH, concat)
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# |x.y.empty| > 1
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formula1 = slv.mkTerm(Kind.GT, concat_len, slv.mkInteger(1))
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# Sequence unit: seq(1)
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unit = slv.mkTerm(Kind.SEQ_UNIT, slv.mkInteger(1))
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# x = seq(1)
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formula2 = slv.mkTerm(Kind.EQUAL, x, unit)
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# Make a query
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q = slv.mkTerm(Kind.AND, formula1, formula2)
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# Check satisfiability
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result = slv.checkSatAssuming(q)
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print("cvc5 reports:", q, "is", result)
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if result:
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print("x = {}".format(slv.getValue(x)))
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print("y = {}".format(slv.getValue(y)))
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