//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <string>

// size_type rfind(basic_string_view sv, size_type pos = npos) const; // constexpr since C++20

#include <string>
#include <cassert>

#include "test_macros.h"
#include "min_allocator.h"

template <class S, class SV>
TEST_CONSTEXPR_CXX20 void
test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x)
{
    LIBCPP_ASSERT_NOEXCEPT(s.rfind(sv, pos));
    assert(s.rfind(sv, pos) == x);
    if (x != S::npos)
        assert(x <= pos && x + sv.size() <= s.size());
}

template <class S, class SV>
TEST_CONSTEXPR_CXX20 void
test(const S& s, SV sv, typename S::size_type x)
{
    LIBCPP_ASSERT_NOEXCEPT(s.rfind(sv));
    assert(s.rfind(sv) == x);
    if (x != S::npos)
        assert(0 <= x && x + sv.size() <= s.size());
}

template <class S, class SV>
TEST_CONSTEXPR_CXX20 void test0()
{
    test(S(""), SV(""), 0, 0);
    test(S(""), SV("abcde"), 0, S::npos);
    test(S(""), SV("abcdeabcde"), 0, S::npos);
    test(S(""), SV("abcdeabcdeabcdeabcde"), 0, S::npos);
    test(S(""), SV(""), 1, 0);
    test(S(""), SV("abcde"), 1, S::npos);
    test(S(""), SV("abcdeabcde"), 1, S::npos);
    test(S(""), SV("abcdeabcdeabcdeabcde"), 1, S::npos);
    test(S("abcde"), SV(""), 0, 0);
    test(S("abcde"), SV("abcde"), 0, 0);
    test(S("abcde"), SV("abcdeabcde"), 0, S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), 0, S::npos);
    test(S("abcde"), SV(""), 1, 1);
    test(S("abcde"), SV("abcde"), 1, 0);
    test(S("abcde"), SV("abcdeabcde"), 1, S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), 1, S::npos);
    test(S("abcde"), SV(""), 2, 2);
    test(S("abcde"), SV("abcde"), 2, 0);
    test(S("abcde"), SV("abcdeabcde"), 2, S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), 2, S::npos);
    test(S("abcde"), SV(""), 4, 4);
    test(S("abcde"), SV("abcde"), 4, 0);
    test(S("abcde"), SV("abcdeabcde"), 4, S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), 4, S::npos);
    test(S("abcde"), SV(""), 5, 5);
    test(S("abcde"), SV("abcde"), 5, 0);
    test(S("abcde"), SV("abcdeabcde"), 5, S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), 5, S::npos);
    test(S("abcde"), SV(""), 6, 5);
    test(S("abcde"), SV("abcde"), 6, 0);
    test(S("abcde"), SV("abcdeabcde"), 6, S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), 6, S::npos);
    test(S("abcdeabcde"), SV(""), 0, 0);
    test(S("abcdeabcde"), SV("abcde"), 0, 0);
    test(S("abcdeabcde"), SV("abcdeabcde"), 0, 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), 0, S::npos);
    test(S("abcdeabcde"), SV(""), 1, 1);
    test(S("abcdeabcde"), SV("abcde"), 1, 0);
    test(S("abcdeabcde"), SV("abcdeabcde"), 1, 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), 1, S::npos);
    test(S("abcdeabcde"), SV(""), 5, 5);
    test(S("abcdeabcde"), SV("abcde"), 5, 5);
    test(S("abcdeabcde"), SV("abcdeabcde"), 5, 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), 5, S::npos);
    test(S("abcdeabcde"), SV(""), 9, 9);
    test(S("abcdeabcde"), SV("abcde"), 9, 5);
    test(S("abcdeabcde"), SV("abcdeabcde"), 9, 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), 9, S::npos);
    test(S("abcdeabcde"), SV(""), 10, 10);
    test(S("abcdeabcde"), SV("abcde"), 10, 5);
    test(S("abcdeabcde"), SV("abcdeabcde"), 10, 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), 10, S::npos);
    test(S("abcdeabcde"), SV(""), 11, 10);
    test(S("abcdeabcde"), SV("abcde"), 11, 5);
    test(S("abcdeabcde"), SV("abcdeabcde"), 11, 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), 11, S::npos);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 0, 0);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 0, 0);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 0, 0);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 0, 0);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 1, 1);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 1, 0);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 1, 0);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 1, 0);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 10, 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 10, 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 10, 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 10, 0);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 19, 19);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 19, 15);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 19, 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 19, 0);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 20, 20);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 20, 15);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 20, 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 20, 0);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 21, 20);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 21, 15);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 21, 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 21, 0);
}

template <class S, class SV>
TEST_CONSTEXPR_CXX20 void test1()
{
    test(S(""), SV(""), 0);
    test(S(""), SV("abcde"), S::npos);
    test(S(""), SV("abcdeabcde"), S::npos);
    test(S(""), SV("abcdeabcdeabcdeabcde"), S::npos);
    test(S("abcde"), SV(""), 5);
    test(S("abcde"), SV("abcde"), 0);
    test(S("abcde"), SV("abcdeabcde"), S::npos);
    test(S("abcde"), SV("abcdeabcdeabcdeabcde"), S::npos);
    test(S("abcdeabcde"), SV(""), 10);
    test(S("abcdeabcde"), SV("abcde"), 5);
    test(S("abcdeabcde"), SV("abcdeabcde"), 0);
    test(S("abcdeabcde"), SV("abcdeabcdeabcdeabcde"), S::npos);
    test(S("abcdeabcdeabcdeabcde"), SV(""), 20);
    test(S("abcdeabcdeabcdeabcde"), SV("abcde"), 15);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcde"), 10);
    test(S("abcdeabcdeabcdeabcde"), SV("abcdeabcdeabcdeabcde"), 0);
}

TEST_CONSTEXPR_CXX20 bool test() {
  {
    typedef std::string S;
    typedef std::string_view SV;
    test0<S, SV>();
    test1<S, SV>();
  }
#if TEST_STD_VER >= 11
  {
    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
    typedef std::string_view SV;
    test0<S, SV>();
    test1<S, SV>();
  }
#endif

  return true;
}

int main(int, char**)
{
  test();
#if TEST_STD_VER > 17
  static_assert(test());
#endif

  return 0;
}
