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/********************* */
/*! \file ouroborous.cpp
** \verbatim
** Original author: mdeters
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** 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 (up to renaming
** variables), or the test fails.
**/
#include <iostream>
#include <sstream>
#include <string>
#include "expr/expr.h"
#include "expr/command.h"
#include "parser/parser.h"
#include "parser/parser_builder.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\
";
int runTest();
int main() {
try {
return runTest();
} catch(Exception& e) {
cerr << e << endl;
} catch(...) {
cerr << "non-cvc4 exception thrown." << endl;
}
return 1;
}
string translate(Parser* parser, string in, InputLanguage inlang, OutputLanguage outlang) {
cout << "==============================================" << endl
<< "translating from " << inlang << " to " << outlang << " this string:" << endl
<< in << endl;
parser->setInput(Input::newStringInput(inlang, in, "internal-buffer"));
stringstream ss;
ss << Expr::setlanguage(outlang) << parser->nextExpression();
AlwaysAssert(parser->nextExpression().isNull(), "next expr should be null");
AlwaysAssert(parser->done(), "parser should be done");
string s = ss.str();
cout << "got this:" << endl
<< s << endl
<< "==============================================" << endl;
return s;
}
int runTest() {
ExprManager em;
Parser* parser =
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 = parser->nextCommand()) {
delete c;
}
AlwaysAssert(parser->done(), "parser should be done");
string instr = "(= (f (f y)) x)";
string smt2 = translate(parser, instr, input::LANG_SMTLIB_V2, output::LANG_SMTLIB_V2);
string smt1 = translate(parser, smt2, input::LANG_SMTLIB_V2, output::LANG_SMTLIB);
//string cvc = translate(parser, smt1, input::LANG_SMTLIB, output::LANG_CVC4);
//string out = translate(parser, cvc, input::LANG_CVC4, output::LANG_SMTLIB_V2);
string out = smt1;
AlwaysAssert(out == smt2, "differences in output");
delete parser;
return 0;
}
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