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/******************************************************************************
* Top contributors (to current version):
* Aina Niemetz, Andrew Reynolds, Andres Noetzli
*
* 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.
* ****************************************************************************
*
* Unit tests for symbolic regular expression operations.
*/
#include <cvc5/cvc5.h>
#include <iostream>
#include <memory>
#include <vector>
#include "expr/node.h"
#include "expr/node_manager.h"
#include "test_smt.h"
#include "theory/rewriter.h"
#include "theory/strings/regexp_entail.h"
#include "util/string.h"
namespace cvc5::internal {
using namespace theory;
using namespace theory::strings;
namespace test {
class TestTheoryBlackRegexpOperation : public TestSmt
{
protected:
void SetUp() override
{
TestSmt::SetUp();
}
void includes(Node r1, Node r2)
{
Rewriter* rr = d_slvEngine->getEnv().getRewriter();
r1 = rr->rewrite(r1);
r2 = rr->rewrite(r2);
std::cout << r1 << " includes " << r2 << std::endl;
ASSERT_TRUE(RegExpEntail::regExpIncludes(r1, r2));
}
void doesNotInclude(Node r1, Node r2)
{
Rewriter* rr = d_slvEngine->getEnv().getRewriter();
r1 = rr->rewrite(r1);
r2 = rr->rewrite(r2);
std::cout << r1 << " does not include " << r2 << std::endl;
ASSERT_FALSE(RegExpEntail::regExpIncludes(r1, r2));
}
};
TEST_F(TestTheoryBlackRegexpOperation, basic)
{
Node sigma = d_nodeManager->mkNode(Kind::REGEXP_ALLCHAR);
Node sigmaStar = d_nodeManager->mkNode(Kind::REGEXP_STAR, sigma);
Node a = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("a")));
Node c = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("c")));
Node abc = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("abc")));
Node sigma3 = d_nodeManager->mkNode(Kind::REGEXP_CONCAT, sigma, sigma, sigma);
Node asc = d_nodeManager->mkNode(Kind::REGEXP_CONCAT, a, sigma, c);
Node asw = d_nodeManager->mkNode(Kind::REGEXP_CONCAT, a, sigma, sigmaStar);
includes(sigma3, abc);
doesNotInclude(abc, sigma3);
includes(sigma3, asc);
doesNotInclude(asc, sigma3);
includes(asc, abc);
doesNotInclude(abc, asc);
includes(asw, asc);
doesNotInclude(asc, asw);
}
TEST_F(TestTheoryBlackRegexpOperation, star_wildcards)
{
Rewriter* rr = d_slvEngine->getEnv().getRewriter();
Node sigma = d_nodeManager->mkNode(Kind::REGEXP_ALLCHAR);
Node sigmaStar = d_nodeManager->mkNode(Kind::REGEXP_STAR, sigma);
Node a = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("a")));
Node c = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("c")));
Node abc = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("abc")));
Node _abc_ =
d_nodeManager->mkNode(Kind::REGEXP_CONCAT, sigmaStar, abc, sigmaStar);
Node _asc_ = d_nodeManager->mkNode(Kind::REGEXP_CONCAT,
{sigmaStar, a, sigma, c, sigmaStar});
Node _sc_ = rr->rewrite(d_nodeManager->mkNode(
Kind::REGEXP_CONCAT, {sigmaStar, sigma, c, sigmaStar}));
Node _as_ = rr->rewrite(d_nodeManager->mkNode(
Kind::REGEXP_CONCAT, {sigmaStar, a, sigma, sigmaStar}));
Node _assc_ = d_nodeManager->mkNode(
Kind::REGEXP_CONCAT,
std::vector<Node>{sigmaStar, a, sigma, sigma, c, sigmaStar});
Node _csa_ = d_nodeManager->mkNode(Kind::REGEXP_CONCAT,
{sigmaStar, c, sigma, a, sigmaStar});
Node _c_a_ = d_nodeManager->mkNode(Kind::REGEXP_CONCAT,
{sigmaStar, c, sigmaStar, a, sigmaStar});
Node _s_s_ = rr->rewrite(d_nodeManager->mkNode(
Kind::REGEXP_CONCAT, {sigmaStar, sigma, sigmaStar, sigma, sigmaStar}));
Node _a_abc_ = rr->rewrite(d_nodeManager->mkNode(
Kind::REGEXP_CONCAT, {sigmaStar, a, sigmaStar, abc, sigmaStar}));
includes(_asc_, _abc_);
doesNotInclude(_abc_, _asc_);
doesNotInclude(_csa_, _abc_);
doesNotInclude(_assc_, _asc_);
doesNotInclude(_asc_, _assc_);
includes(_sc_, abc);
includes(_sc_, _abc_);
includes(_sc_, _asc_);
includes(_sc_, _assc_);
doesNotInclude(_sc_, _csa_);
includes(_as_, abc);
includes(_as_, _abc_);
includes(_as_, _asc_);
includes(_as_, _assc_);
doesNotInclude(_sc_, _csa_);
includes(_s_s_, _c_a_);
doesNotInclude(_c_a_, _s_s_);
includes(_abc_, _a_abc_);
doesNotInclude(_a_abc_, _abc_);
}
TEST_F(TestTheoryBlackRegexpOperation, generalizedRegExp)
{
RegExpEntail re(d_nodeManager.get(), nullptr);
TypeNode strType = d_nodeManager->stringType();
TypeNode intType = d_nodeManager->integerType();
Node abc = d_nodeManager->mkConst(String("abc"));
Node a = d_nodeManager->mkDummySkolem("a", intType);
Node s = d_nodeManager->mkDummySkolem("s", strType);
Node fia = d_nodeManager->mkNode(Kind::STRING_ITOS, a);
Node fils = d_nodeManager->mkNode(
Kind::STRING_ITOS, d_nodeManager->mkNode(Kind::STRING_LENGTH, s));
Node sigma = d_nodeManager->mkNode(Kind::REGEXP_ALLCHAR);
Node sigmaStar = d_nodeManager->mkNode(Kind::REGEXP_STAR, sigma);
Node rabc = d_nodeManager->mkNode(Kind::STRING_TO_REGEXP,
d_nodeManager->mkConst(String("abc")));
Node digRange = d_nodeManager->mkNode(Kind::REGEXP_RANGE,
d_nodeManager->mkConst(String("0")),
d_nodeManager->mkConst(String("9")));
Node digRangeStar = d_nodeManager->mkNode(Kind::REGEXP_STAR, digRange);
Node digRangePlus =
d_nodeManager->mkNode(Kind::REGEXP_CONCAT, digRange, digRangeStar);
ASSERT_TRUE(re.getGeneralizedConstRegExp(s).isNull());
ASSERT_EQ(re.getGeneralizedConstRegExp(fia), digRangeStar);
ASSERT_EQ(re.getGeneralizedConstRegExp(fils), digRangePlus);
ASSERT_EQ(re.getGeneralizedConstRegExp(abc), rabc);
Node ss = d_nodeManager->mkNode(Kind::STRING_CONCAT, s, s);
ASSERT_TRUE(re.getGeneralizedConstRegExp(ss).isNull());
}
} // namespace test
} // namespace cvc5::internal
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