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/******************************************************************************
* Top contributors (to current version):
* Daniel Larraz
*
* 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.
* ****************************************************************************
*
* "Ouroborous" test: does cvc5 read its own output?
*
* The "Ouroborous" test, named after the serpent that swallows its
* own tail, ensures that cvc5 can parse some input, output it again
* (in any of its languages) and then parse it again. The result of
* the first parse must be equal to the result of the second parse;
* both strings and expressions are compared for equality.
*
* To add a new test, simply add a call to runTestString() under
* runTest(), below. If you don't specify an input language,
* LANG_SMTLIB_V2 is used. If your example depends on symbolic constants,
* you'll need to declare them in the "declarations" global, just
* below, in SMT-LIBv2 form (but they're good for all languages).
*/
import io.github.cvc5.*;
import io.github.cvc5.modes.*;
import java.io.*;
public class Ouroborous
{
public static void main(String[] args)
{
try
{
System.exit(runTest());
}
catch (CVC5ApiException e)
{
System.err.println(e.getMessage());
}
catch (Exception e)
{
System.err.println("non-cvc5 exception thrown");
e.printStackTrace();
}
System.exit(1);
}
private static String parse(String instr, String inputLanguage, String outputLanguage)
throws CVC5ApiException
{
assert inputLanguage.equals("smt2");
assert outputLanguage.equals("smt2");
String declarations = "(set-logic ALL)\n"
+ "(declare-sort U 0)\n"
+ "(declare-fun f (U) U)\n"
+ "(declare-fun x () U)\n"
+ "(declare-fun y () U)\n"
+ "(assert (= (f x) x))\n"
+ "(declare-fun a () (Array U (Array U U)))\n";
TermManager tm = new TermManager();
Solver solver = new Solver(tm);
solver.setOption("input-language", inputLanguage);
solver.setOption("output-language", outputLanguage);
SymbolManager symman = new SymbolManager(tm);
InputParser parser = new InputParser(solver, symman);
parser.setStringInput(InputLanguage.SMT_LIB_2_6, declarations, "internal-buffer");
Command c;
while (true)
{
c = parser.nextCommand();
if (c == null || c.isNull())
{
break;
}
c.invoke(solver, symman);
}
assert parser.done();
parser.setStringInput(InputLanguage.SMT_LIB_2_6, instr, "internal-buffer");
Term e = parser.nextTerm();
String s = e.toString();
assert parser.nextTerm() == null; // should be no more terms
return s;
}
private static String translate(String instr, String inputLanguage, String outputLanguage)
throws CVC5ApiException
{
assert inputLanguage.equals("smt2");
assert outputLanguage.equals("smt2");
System.out.println("==============================================");
System.out.println(
"translating from " + inputLanguage + " to " + outputLanguage + " this string:");
System.out.println(instr);
String outstr = parse(instr, inputLanguage, outputLanguage);
System.out.println("got this:");
System.out.println(outstr);
System.out.println("reparsing as " + outputLanguage);
String poutstr = parse(outstr, outputLanguage, outputLanguage);
assert outstr.equals(poutstr);
System.out.println("got same expressions " + outstr + " and " + poutstr);
System.out.println("==============================================");
return outstr;
}
private static void runTestString(String instr, String instrLanguage) throws CVC5ApiException
{
System.out.println();
System.out.println("starting with: " + instr);
System.out.println(" in language " + instrLanguage);
String smt2str = translate(instr, instrLanguage, "smt2");
System.out.println("in SMT2 : " + smt2str);
String outstr = translate(smt2str, "smt2", "smt2");
System.out.println("to SMT2 : " + outstr);
System.out.println();
assert outstr.equals(smt2str);
}
private static int runTest() throws CVC5ApiException
{
runTestString("(= (f (f y)) x)", "smt2");
runTestString("(= ((_ extract 2 1) (bvnot (bvadd #b000 #b011))) #b10)", "smt2");
runTestString("((_ extract 2 0) (bvnot (bvadd (bvmul #b001 #b011) #b011)))", "smt2");
return 0;
}
}
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