//===----------------------------------------------------------------------===//
//
// 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_view>

// constexpr int compare(size_type pos1, size_type n1, basic_string_view str) const;

#include <string_view>
#include <cassert>
#include <stdexcept>

#include "test_macros.h"
#include "constexpr_char_traits.hpp"

int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }

template<typename CharT>
void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
            std::basic_string_view<CharT> sv2, int expected ) {
#ifdef TEST_HAS_NO_EXCEPTIONS
    if (pos1 <= sv1.size())
        assert(sign( sv1.compare(pos1, n1, sv2)) == sign(expected));
#else
    try {
        assert(sign( sv1.compare(pos1, n1, sv2)) == sign(expected));
        assert(pos1 <= sv1.size());
    }
    catch (const std::out_of_range&) {
        assert(pos1 > sv1.size());
    }
#endif
}


template<typename CharT>
void test ( const CharT *s1, size_t pos1, size_t n1, const CharT  *s2, int expected ) {
    typedef std::basic_string_view<CharT> string_view_t;
    string_view_t sv1 ( s1 );
    string_view_t sv2 ( s2 );
    test1(sv1, pos1, n1, sv2, expected);
}

void test0()
{
    test("", 0, 0, "", 0);
    test("", 0, 0, "abcde", -5);
    test("", 0, 0, "abcdefghij", -10);
    test("", 0, 0, "abcdefghijklmnopqrst", -20);
    test("", 0, 1, "", 0);
    test("", 0, 1, "abcde", -5);
    test("", 0, 1, "abcdefghij", -10);
    test("", 0, 1, "abcdefghijklmnopqrst", -20);
    test("", 1, 0, "", 0);
    test("", 1, 0, "abcde", 0);
    test("", 1, 0, "abcdefghij", 0);
    test("", 1, 0, "abcdefghijklmnopqrst", 0);
    test("abcde", 0, 0, "", 0);
    test("abcde", 0, 0, "abcde", -5);
    test("abcde", 0, 0, "abcdefghij", -10);
    test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
    test("abcde", 0, 1, "", 1);
    test("abcde", 0, 1, "abcde", -4);
    test("abcde", 0, 1, "abcdefghij", -9);
    test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
    test("abcde", 0, 2, "", 2);
    test("abcde", 0, 2, "abcde", -3);
    test("abcde", 0, 2, "abcdefghij", -8);
    test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
    test("abcde", 0, 4, "", 4);
    test("abcde", 0, 4, "abcde", -1);
    test("abcde", 0, 4, "abcdefghij", -6);
    test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
    test("abcde", 0, 5, "", 5);
    test("abcde", 0, 5, "abcde", 0);
    test("abcde", 0, 5, "abcdefghij", -5);
    test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
    test("abcde", 0, 6, "", 5);
    test("abcde", 0, 6, "abcde", 0);
    test("abcde", 0, 6, "abcdefghij", -5);
    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
    test("abcde", 1, 0, "", 0);
    test("abcde", 1, 0, "abcde", -5);
    test("abcde", 1, 0, "abcdefghij", -10);
    test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
    test("abcde", 1, 1, "", 1);
    test("abcde", 1, 1, "abcde", 1);
    test("abcde", 1, 1, "abcdefghij", 1);
    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
    test("abcde", 1, 2, "", 2);
    test("abcde", 1, 2, "abcde", 1);
    test("abcde", 1, 2, "abcdefghij", 1);
    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
    test("abcde", 1, 3, "", 3);
    test("abcde", 1, 3, "abcde", 1);
    test("abcde", 1, 3, "abcdefghij", 1);
    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
    test("abcde", 1, 4, "", 4);
    test("abcde", 1, 4, "abcde", 1);
    test("abcde", 1, 4, "abcdefghij", 1);
    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
    test("abcde", 1, 5, "", 4);
    test("abcde", 1, 5, "abcde", 1);
    test("abcde", 1, 5, "abcdefghij", 1);
    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
    test("abcde", 2, 0, "", 0);
    test("abcde", 2, 0, "abcde", -5);
    test("abcde", 2, 0, "abcdefghij", -10);
    test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
    test("abcde", 2, 1, "", 1);
    test("abcde", 2, 1, "abcde", 2);
    test("abcde", 2, 1, "abcdefghij", 2);
    test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
    test("abcde", 2, 2, "", 2);
    test("abcde", 2, 2, "abcde", 2);
    test("abcde", 2, 2, "abcdefghij", 2);
    test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
    test("abcde", 2, 3, "", 3);
    test("abcde", 2, 3, "abcde", 2);
    test("abcde", 2, 3, "abcdefghij", 2);
    test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
    test("abcde", 2, 4, "", 3);
    test("abcde", 2, 4, "abcde", 2);
    test("abcde", 2, 4, "abcdefghij", 2);
    test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
    test("abcde", 4, 0, "", 0);
    test("abcde", 4, 0, "abcde", -5);
    test("abcde", 4, 0, "abcdefghij", -10);
    test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
    test("abcde", 4, 1, "", 1);
    test("abcde", 4, 1, "abcde", 4);
    test("abcde", 4, 1, "abcdefghij", 4);
    test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
    test("abcde", 4, 2, "", 1);
    test("abcde", 4, 2, "abcde", 4);
    test("abcde", 4, 2, "abcdefghij", 4);
    test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
    test("abcde", 5, 0, "", 0);
    test("abcde", 5, 0, "abcde", -5);
    test("abcde", 5, 0, "abcdefghij", -10);
    test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
    test("abcde", 5, 1, "", 0);
    test("abcde", 5, 1, "abcde", -5);
    test("abcde", 5, 1, "abcdefghij", -10);
    test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
}

void test1()
{
    test("abcde", 6, 0, "", 0);
    test("abcde", 6, 0, "abcde", 0);
    test("abcde", 6, 0, "abcdefghij", 0);
    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
    test("abcdefghij", 0, 0, "", 0);
    test("abcdefghij", 0, 0, "abcde", -5);
    test("abcdefghij", 0, 0, "abcdefghij", -10);
    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghij", 0, 1, "", 1);
    test("abcdefghij", 0, 1, "abcde", -4);
    test("abcdefghij", 0, 1, "abcdefghij", -9);
    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
    test("abcdefghij", 0, 5, "", 5);
    test("abcdefghij", 0, 5, "abcde", 0);
    test("abcdefghij", 0, 5, "abcdefghij", -5);
    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
    test("abcdefghij", 0, 9, "", 9);
    test("abcdefghij", 0, 9, "abcde", 4);
    test("abcdefghij", 0, 9, "abcdefghij", -1);
    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
    test("abcdefghij", 0, 10, "", 10);
    test("abcdefghij", 0, 10, "abcde", 5);
    test("abcdefghij", 0, 10, "abcdefghij", 0);
    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
    test("abcdefghij", 0, 11, "", 10);
    test("abcdefghij", 0, 11, "abcde", 5);
    test("abcdefghij", 0, 11, "abcdefghij", 0);
    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
    test("abcdefghij", 1, 0, "", 0);
    test("abcdefghij", 1, 0, "abcde", -5);
    test("abcdefghij", 1, 0, "abcdefghij", -10);
    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghij", 1, 1, "", 1);
    test("abcdefghij", 1, 1, "abcde", 1);
    test("abcdefghij", 1, 1, "abcdefghij", 1);
    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
    test("abcdefghij", 1, 4, "", 4);
    test("abcdefghij", 1, 4, "abcde", 1);
    test("abcdefghij", 1, 4, "abcdefghij", 1);
    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
    test("abcdefghij", 1, 8, "", 8);
    test("abcdefghij", 1, 8, "abcde", 1);
    test("abcdefghij", 1, 8, "abcdefghij", 1);
    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
    test("abcdefghij", 1, 9, "", 9);
    test("abcdefghij", 1, 9, "abcde", 1);
    test("abcdefghij", 1, 9, "abcdefghij", 1);
    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
    test("abcdefghij", 1, 10, "", 9);
    test("abcdefghij", 1, 10, "abcde", 1);
    test("abcdefghij", 1, 10, "abcdefghij", 1);
    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
    test("abcdefghij", 5, 0, "", 0);
    test("abcdefghij", 5, 0, "abcde", -5);
    test("abcdefghij", 5, 0, "abcdefghij", -10);
    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghij", 5, 1, "", 1);
    test("abcdefghij", 5, 1, "abcde", 5);
    test("abcdefghij", 5, 1, "abcdefghij", 5);
    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
    test("abcdefghij", 5, 2, "", 2);
    test("abcdefghij", 5, 2, "abcde", 5);
    test("abcdefghij", 5, 2, "abcdefghij", 5);
    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
    test("abcdefghij", 5, 4, "", 4);
    test("abcdefghij", 5, 4, "abcde", 5);
    test("abcdefghij", 5, 4, "abcdefghij", 5);
    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
    test("abcdefghij", 5, 5, "", 5);
    test("abcdefghij", 5, 5, "abcde", 5);
    test("abcdefghij", 5, 5, "abcdefghij", 5);
    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
    test("abcdefghij", 5, 6, "", 5);
    test("abcdefghij", 5, 6, "abcde", 5);
    test("abcdefghij", 5, 6, "abcdefghij", 5);
    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
    test("abcdefghij", 9, 0, "", 0);
    test("abcdefghij", 9, 0, "abcde", -5);
    test("abcdefghij", 9, 0, "abcdefghij", -10);
    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghij", 9, 1, "", 1);
    test("abcdefghij", 9, 1, "abcde", 9);
    test("abcdefghij", 9, 1, "abcdefghij", 9);
    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
    test("abcdefghij", 9, 2, "", 1);
    test("abcdefghij", 9, 2, "abcde", 9);
    test("abcdefghij", 9, 2, "abcdefghij", 9);
    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
    test("abcdefghij", 10, 0, "", 0);
    test("abcdefghij", 10, 0, "abcde", -5);
    test("abcdefghij", 10, 0, "abcdefghij", -10);
    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghij", 10, 1, "", 0);
    test("abcdefghij", 10, 1, "abcde", -5);
    test("abcdefghij", 10, 1, "abcdefghij", -10);
    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
    test("abcdefghij", 11, 0, "", 0);
    test("abcdefghij", 11, 0, "abcde", 0);
    test("abcdefghij", 11, 0, "abcdefghij", 0);
    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
}

void test2()
{
    test("abcdefghijklmnopqrst", 0, 0, "", 0);
    test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghijklmnopqrst", 0, 1, "", 1);
    test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
    test("abcdefghijklmnopqrst", 0, 10, "", 10);
    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
    test("abcdefghijklmnopqrst", 0, 19, "", 19);
    test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
    test("abcdefghijklmnopqrst", 0, 20, "", 20);
    test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
    test("abcdefghijklmnopqrst", 0, 21, "", 20);
    test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
    test("abcdefghijklmnopqrst", 1, 0, "", 0);
    test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghijklmnopqrst", 1, 1, "", 1);
    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
    test("abcdefghijklmnopqrst", 1, 9, "", 9);
    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
    test("abcdefghijklmnopqrst", 1, 18, "", 18);
    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
    test("abcdefghijklmnopqrst", 1, 19, "", 19);
    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
    test("abcdefghijklmnopqrst", 1, 20, "", 19);
    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
    test("abcdefghijklmnopqrst", 10, 0, "", 0);
    test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghijklmnopqrst", 10, 1, "", 1);
    test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
    test("abcdefghijklmnopqrst", 10, 5, "", 5);
    test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
    test("abcdefghijklmnopqrst", 10, 9, "", 9);
    test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
    test("abcdefghijklmnopqrst", 10, 10, "", 10);
    test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
    test("abcdefghijklmnopqrst", 10, 11, "", 10);
    test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
    test("abcdefghijklmnopqrst", 19, 0, "", 0);
    test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghijklmnopqrst", 19, 1, "", 1);
    test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
    test("abcdefghijklmnopqrst", 19, 2, "", 1);
    test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
    test("abcdefghijklmnopqrst", 20, 0, "", 0);
    test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
    test("abcdefghijklmnopqrst", 20, 1, "", 0);
    test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
    test("abcdefghijklmnopqrst", 21, 0, "", 0);
    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
}


int main(int, char**) {
    test0();
    test1();
    test2();

    {
    test("abcde", 5, 1, "", 0);
    test("abcde", 2, 4, "", 3);
    test("abcde", 2, 4, "abcde", 2);
    test("ABCde", 2, 4, "abcde", -1);
    }

    {
    test(L"abcde", 5, 1, L"", 0);
    test(L"abcde", 2, 4, L"", 3);
    test(L"abcde", 2, 4, L"abcde", 2);
    test(L"ABCde", 2, 4, L"abcde", -1);
    }

#if TEST_STD_VER >= 11
    {
    test(u"abcde", 5, 1, u"", 0);
    test(u"abcde", 2, 4, u"", 3);
    test(u"abcde", 2, 4, u"abcde", 2);
    test(u"ABCde", 2, 4, u"abcde", -1);
    }

    {
    test(U"abcde", 5, 1, U"", 0);
    test(U"abcde", 2, 4, U"", 3);
    test(U"abcde", 2, 4, U"abcde", 2);
    test(U"ABCde", 2, 4, U"abcde", -1);
    }
#endif

#if TEST_STD_VER > 11
    {
    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
    constexpr SV  sv1 { "abcde", 5 };
    constexpr SV  sv2 { "abcde", 0 };
    static_assert ( sv1.compare(5, 1, sv2) == 0, "" );
    static_assert ( sv1.compare(2, 4, sv2) > 0, "" );
    }
#endif

  return 0;
}
