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https://github.com/AdaCore/cvc5.git
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7ff15aa749
This refactors the Solver class in the java API to extend AbstractPointer similar to other cvc5 classes. It also cleans up redundant code for Abstract pointers. and adds Context.deletePointers to java examples as mentioned in issue #10052.
110 lines
3.7 KiB
Java
110 lines
3.7 KiB
Java
/******************************************************************************
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* Top contributors (to current version):
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* Mudathir Mohamed, Andrew Reynolds, 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) 2009-2022 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 Sygus API.
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*
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* A simple demonstration of how to use the Sygus API to synthesize max and min
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* functions. This is a direct translation of sygus-fun.cpp.
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*/
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import static io.github.cvc5.Kind.*;
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import io.github.cvc5.*;
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public class SygusFun
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{
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public static void main(String args[]) throws CVC5ApiException
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{
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Solver slv = new Solver();
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{
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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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Sort integer = slv.getIntegerSort();
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Sort bool = slv.getBooleanSort();
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// declare input variables for the functions-to-synthesize
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Term x = slv.mkVar(integer, "x");
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Term y = slv.mkVar(integer, "y");
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// declare the grammar non-terminals
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Term start = slv.mkVar(integer, "Start");
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Term start_bool = slv.mkVar(bool, "StartBool");
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// define the rules
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Term zero = slv.mkInteger(0);
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Term one = slv.mkInteger(1);
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Term plus = slv.mkTerm(ADD, start, start);
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Term minus = slv.mkTerm(SUB, start, start);
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Term ite = slv.mkTerm(ITE, start_bool, start, start);
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Term And = slv.mkTerm(AND, start_bool, start_bool);
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Term Not = slv.mkTerm(NOT, start_bool);
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Term leq = slv.mkTerm(LEQ, start, start);
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// create the grammar object
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Grammar g = slv.mkGrammar(new Term[] {x, y}, new Term[] {start, start_bool});
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// bind each non-terminal to its rules
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g.addRules(start, new Term[] {zero, one, x, y, plus, minus, ite});
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g.addRules(start_bool, new Term[] {And, Not, leq});
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// declare the functions-to-synthesize. Optionally, provide the grammar
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// constraints
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Term max = slv.synthFun("max", new Term[] {x, y}, integer, g);
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Term min = slv.synthFun("min", new Term[] {x, y}, integer);
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// declare universal variables.
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Term varX = slv.declareSygusVar("x", integer);
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Term varY = slv.declareSygusVar("y", integer);
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Term max_x_y = slv.mkTerm(APPLY_UF, max, varX, varY);
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Term min_x_y = slv.mkTerm(APPLY_UF, min, varX, varY);
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// add semantic constraints
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// (constraint (>= (max x y) x))
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slv.addSygusConstraint(slv.mkTerm(GEQ, max_x_y, varX));
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// (constraint (>= (max x y) y))
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slv.addSygusConstraint(slv.mkTerm(GEQ, max_x_y, varY));
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// (constraint (or (= x (max x y))
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// (= y (max x y))))
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slv.addSygusConstraint(
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slv.mkTerm(OR, slv.mkTerm(EQUAL, max_x_y, varX), slv.mkTerm(EQUAL, max_x_y, varY)));
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// (constraint (= (+ (max x y) (min x y))
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// (+ x y)))
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slv.addSygusConstraint(
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slv.mkTerm(EQUAL, slv.mkTerm(ADD, max_x_y, min_x_y), slv.mkTerm(ADD, varX, varY)));
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// print solutions if available
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if (slv.checkSynth().hasSolution())
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{
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// Output should be equivalent to:
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// (
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// (define-fun max ((x Int) (y Int)) Int (ite (<= x y) y x))
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// (define-fun min ((x Int) (y Int)) Int (ite (<= x y) x y))
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// )
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Term[] terms = new Term[] {max, min};
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Utils.printSynthSolutions(terms, slv.getSynthSolutions(terms));
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}
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}
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Context.deletePointers();
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}
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}
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