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#!/usr/bin/env python
###############################################################################
# Top contributors (to current version):
# Aina Niemetz, Makai Mann, Alex Ozdemir
#
# This file is part of the cvc5 project.
#
# Copyright (c) 2009-2025 by the authors listed in the file AUTHORS
# in the top-level source directory and their institutional affiliations.
# All rights reserved. See the file COPYING in the top-level source
# directory for licensing information.
# #############################################################################
#
# A simple demonstration of the solving capabilities of the cvc5 strings solver
# through the Python API. This is a direct translation of strings-new.cpp.
##
import cvc5
from cvc5 import Kind
if __name__ == "__main__":
tm = cvc5.TermManager()
slv = cvc5.Solver(tm)
# Set the logic
slv.setLogic("QF_SLIA")
# Produce models
slv.setOption("produce-models", "true")
# The option strings-exp is needed
slv.setOption("strings-exp", "true")
# Set output language to SMTLIB2
slv.setOption("output-language", "smt2")
# String type
string = tm.getStringSort()
# std::string
str_ab = "ab"
# String constants
ab = tm.mkString(str_ab)
abc = tm.mkString("abc")
# String variables
x = tm.mkConst(string, "x")
y = tm.mkConst(string, "y")
z = tm.mkConst(string, "z")
# String concatenation: x.ab.y
lhs = tm.mkTerm(Kind.STRING_CONCAT, x, ab, y)
# String concatenation: abc.z
rhs = tm.mkTerm(Kind.STRING_CONCAT, abc, z)
# x.ab.y = abc.z
formula1 = tm.mkTerm(Kind.EQUAL, lhs, rhs)
# Length of y: |y|
leny = tm.mkTerm(Kind.STRING_LENGTH, y)
# |y| >= 0
formula2 = tm.mkTerm(Kind.GEQ, leny, tm.mkInteger(0))
# Regular expression: (ab[c-e]*f)|g|h
r = tm.mkTerm(Kind.REGEXP_UNION,
tm.mkTerm(Kind.REGEXP_CONCAT,
tm.mkTerm(Kind.STRING_TO_REGEXP,
tm.mkString("ab")),
tm.mkTerm(Kind.REGEXP_STAR,
tm.mkTerm(Kind.REGEXP_RANGE,
tm.mkString("c"),
tm.mkString("e"))),
tm.mkTerm(Kind.STRING_TO_REGEXP,
tm.mkString("f"))),
tm.mkTerm(Kind.STRING_TO_REGEXP, tm.mkString("g")),
tm.mkTerm(Kind.STRING_TO_REGEXP, tm.mkString("h")))
# String variables
s1 = tm.mkConst(string, "s1")
s2 = tm.mkConst(string, "s2")
# String concatenation: s1.s2
s = tm.mkTerm(Kind.STRING_CONCAT, s1, s2)
# s1.s2 in (ab[c-e]*f)|g|h
formula3 = tm.mkTerm(Kind.STRING_IN_REGEXP, s, r)
# Make a query
q = tm.mkTerm(Kind.AND, formula1, formula2, formula3)
# check sat
result = slv.checkSatAssuming(q)
print("cvc5 reports:", q, "is", result)
if result:
print("x = ", slv.getValue(x))
print(" s1.s2 =", slv.getValue(s))
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