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/********************* */
/*! \file ouroborous.cpp
** \verbatim
** Top contributors (to current version):
** Aina Niemetz, Morgan Deters, Christopher L. Conway
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 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 <cassert>
#include <iostream>
#include <string>
#include "api/cvc4cpp.h"
#include "options/set_language.h"
#include "parser/parser.h"
#include "parser/parser_builder.h"
#include "smt/command.h"
using namespace cvc5;
using namespace cvc5::parser;
using namespace cvc5::language;
int runTest();
int main()
{
try
{
return runTest();
}
catch (api::CVC4ApiException& e)
{
std::cerr << e.getMessage() << std::endl;
}
catch (parser::ParserException& e)
{
std::cerr << e.getMessage() << std::endl;
}
catch (...)
{
std::cerr << "non-cvc4 exception thrown" << std::endl;
}
return 1;
}
std::string parse(std::string instr,
std::string input_language,
std::string output_language)
{
assert(input_language == "smt2" || input_language == "cvc4");
assert(output_language == "smt2" || output_language == "cvc4");
std::string declarations;
if (input_language == "smt2")
{
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\
";
}
else
{
declarations =
"\
U: TYPE;\n\
f: U -> U;\n\
x,y: U;\n\
a: ARRAY U OF (ARRAY U OF U);\n\
ASSERT f(x) = x;\n\
";
}
api::Solver solver;
InputLanguage ilang =
input_language == "smt2" ? input::LANG_SMTLIB_V2 : input::LANG_CVC4;
solver.setOption("input-language", input_language);
solver.setOption("output-language", output_language);
SymbolManager symman(&solver);
Parser* parser = ParserBuilder(&solver, &symman, "internal-buffer")
.withStringInput(declarations)
.withInputLanguage(ilang)
.build();
// we don't need to execute the commands, but we DO need to parse them to
// get the declarations
while (Command* c = parser->nextCommand())
{
delete c;
}
assert(parser->done()); // parser should be done
parser->setInput(Input::newStringInput(ilang, instr, "internal-buffer"));
api::Term e = parser->nextExpression();
std::string s = e.toString();
assert(parser->nextExpression().isNull()); // next expr should be null
delete parser;
return s;
}
std::string translate(std::string instr,
std::string input_language,
std::string output_language)
{
assert(input_language == "smt2" || input_language == "cvc4");
assert(output_language == "smt2" || output_language == "cvc4");
std::cout << "==============================================" << std::endl
<< "translating from "
<< (input_language == "smt2" ? input::LANG_SMTLIB_V2
: input::LANG_CVC4)
<< " to "
<< (output_language == "smt2" ? output::LANG_SMTLIB_V2
: output::LANG_CVC4)
<< " this string:" << std::endl
<< instr << std::endl;
std::string outstr = parse(instr, input_language, output_language);
std::cout << "got this:" << std::endl
<< outstr << std::endl
<< "reparsing as "
<< (output_language == "smt2" ? input::LANG_SMTLIB_V2
: input::LANG_CVC4)
<< std::endl;
std::string poutstr = parse(outstr, output_language, output_language);
assert(outstr == poutstr);
std::cout << "got same expressions " << outstr << " and " << poutstr
<< std::endl
<< "==============================================" << std::endl;
return outstr;
}
void runTestString(std::string instr, std::string instr_language)
{
std::cout << std::endl
<< "starting with: " << instr << std::endl
<< " in language " << input::LANG_SMTLIB_V2 << std::endl;
std::string smt2str = translate(instr, instr_language, "smt2");
std::cout << "in SMT2 : " << smt2str << std::endl;
std::string cvcstr = translate(smt2str, "smt2", "cvc4");
std::cout << "in CVC : " << cvcstr << std::endl;
std::string outstr = translate(cvcstr, "cvc4", "smt2");
std::cout << "back to SMT2 : " << outstr << std::endl << std::endl;
assert(outstr == smt2str); // differences in output
}
int32_t runTest()
{
runTestString("(= (f (f y)) x)", "smt2");
runTestString("~BVPLUS(3, 0bin00, 0bin11)[2:1] = 0bin10", "cvc4");
runTestString("~BVPLUS(3, BVMULT(2, 0bin01, 0bin11), 0bin11)[2:0]", "cvc4");
runTestString("a[x][y] = a[y][x]", "cvc4");
return 0;
}
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