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/********************* */
/*! \file ouroborous.cpp
** \verbatim
** Top contributors (to current version):
** Morgan Deters, Paul Meng, Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 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.\endverbatim
**
** \brief "Ouroborous" test: does CVC4 read its own output?
**
** The "Ouroborous" test, named after the serpent that swallows its
** own tail, ensures that CVC4 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 variables,
** you'll need to declare them in the "declarations" global, just
** below, in SMT-LIBv2 form (but they're good for all languages).
**/
#include <iostream>
#include <sstream>
#include <string>
#include "expr/expr.h"
#include "expr/expr_iomanip.h"
#include "options/set_language.h"
#include "parser/parser.h"
#include "parser/parser_builder.h"
#include "smt/command.h"
using namespace CVC4;
using namespace CVC4::parser;
using namespace CVC4::language;
using namespace std;
const string declarations = "\
(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\
";
Parser* psr = NULL;
int runTest();
int main() {
try {
return runTest();
} catch(Exception& e) {
cerr << e << endl;
} catch(...) {
cerr << "non-cvc4 exception thrown." << endl;
}
return 1;
}
string translate(string in, InputLanguage inlang, OutputLanguage outlang) {
cout << "==============================================" << endl
<< "translating from " << inlang << " to " << outlang << " this string:" << endl
<< in << endl;
psr->setInput(Input::newStringInput(inlang, in, "internal-buffer"));
Expr e = psr->nextExpression();
stringstream ss;
ss << language::SetLanguage(outlang) << expr::ExprSetDepth(-1) << e;
assert(psr->nextExpression().isNull());// next expr should be null
assert(psr->done());// parser should be done
string s = ss.str();
cout << "got this:" << endl
<< s << endl
<< "reparsing as " << outlang << endl;
psr->setInput(Input::newStringInput(toInputLanguage(outlang), s, "internal-buffer"));
Expr f = psr->nextExpression();
assert(e == f);
cout << "got same expressions " << e.getId() << " and " << f.getId() << endl
<< "==============================================" << endl;
return s;
}
void runTestString(std::string instr, InputLanguage instrlang = input::LANG_SMTLIB_V2) {
cout << endl
<< "starting with: " << instr << endl
<< " in language " << instrlang << endl;
string smt2 = translate(instr, instrlang, output::LANG_SMTLIB_V2);
cout << "in SMT2 : " << smt2 << endl;
/* -- SMT-LIBv1 doesn't have a functional printer yet
string smt1 = translate(smt2, input::LANG_SMTLIB_V2, output::LANG_SMTLIB);
cout << "in SMT1 : " << smt1 << endl;
*/
string cvc = translate(smt2, input::LANG_SMTLIB_V2, output::LANG_CVC4);
cout << "in CVC : " << cvc << endl;
string out = translate(cvc, input::LANG_CVC4, output::LANG_SMTLIB_V2);
cout << "back to SMT2 : " << out << endl << endl;
assert(out == smt2);// differences in output
}
int runTest() {
ExprManager em;
psr =
ParserBuilder(&em, "internal-buffer")
.withStringInput(declarations)
.withInputLanguage(input::LANG_SMTLIB_V2)
.build();
// we don't need to execute them, but we DO need to parse them to
// get the declarations
while(Command* c = psr->nextCommand()) {
delete c;
}
assert(psr->done());// parser should be done
cout << expr::ExprSetDepth(-1);
runTestString("(= (f (f y)) x)");
runTestString("~BVPLUS(3, 0bin00, 0bin11)[2:1] = 0bin10", input::LANG_CVC4);
runTestString("~BVPLUS(3, BVMULT(2, 0bin01, 0bin11), 0bin11)[2:0]", input::LANG_CVC4);
runTestString("a[x][y] = a[y][x]", input::LANG_CVC4);
delete psr;
psr = NULL;
return 0;
}
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