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// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: BSD-3-Clause
#include <gtest/gtest.h>
#include <algorithm>
#include <ranges>
#include <seqan3/core/detail/iterator_traits.hpp>
#include <seqan3/core/range/type_traits.hpp>
#include <seqan3/test/expect_range_eq.hpp>
#include <seqan3/test/expect_same_type.hpp>
#include <seqan3/utility/views/repeat.hpp>
TEST(repeat_view, deduction_guide)
{
int value = 0;
int const & value_cref = value;
seqan3::detail::repeat_view repeat_view1{value};
EXPECT_SAME_TYPE(decltype(repeat_view1), seqan3::detail::repeat_view<int>);
seqan3::detail::repeat_view repeat_view2{value_cref};
EXPECT_SAME_TYPE(decltype(repeat_view2), seqan3::detail::repeat_view<int>);
}
TEST(general, construction)
{
// char
char chr{'A'};
auto v = seqan3::views::repeat(chr);
EXPECT_TRUE((std::is_default_constructible_v<decltype(v)>));
EXPECT_TRUE((std::is_copy_constructible_v<decltype(v)>));
EXPECT_TRUE((std::is_move_constructible_v<decltype(v)>));
EXPECT_TRUE((std::is_copy_assignable_v<decltype(v)>));
EXPECT_TRUE((std::is_move_assignable_v<decltype(v)>));
// char const
char const chr_const{'A'};
auto v_const = seqan3::views::repeat(chr_const);
EXPECT_TRUE((std::is_default_constructible_v<decltype(v_const)>));
EXPECT_TRUE((std::is_copy_constructible_v<decltype(v_const)>));
EXPECT_TRUE((std::is_move_constructible_v<decltype(v_const)>));
EXPECT_TRUE((std::is_copy_assignable_v<decltype(v_const)>));
EXPECT_TRUE((std::is_move_assignable_v<decltype(v_const)>));
}
TEST(general, concept)
{
char chr{'A'};
auto v = seqan3::views::repeat(chr);
EXPECT_TRUE((std::ranges::range<decltype(v)>));
EXPECT_TRUE((std::ranges::input_range<decltype(v)>));
EXPECT_TRUE((std::ranges::forward_range<decltype(v)>));
EXPECT_TRUE((std::ranges::bidirectional_range<decltype(v)>));
EXPECT_TRUE((std::ranges::random_access_range<decltype(v)>));
EXPECT_FALSE((std::ranges::contiguous_range<decltype(v)>));
EXPECT_TRUE((std::ranges::view<decltype(v)>));
EXPECT_FALSE((std::ranges::sized_range<decltype(v)>));
EXPECT_FALSE((std::ranges::common_range<decltype(v)>));
EXPECT_TRUE((std::ranges::output_range<decltype(v), char>));
}
TEST(general, iterator)
{
auto v = seqan3::views::repeat('A');
EXPECT_TRUE(v.begin() == v.begin());
EXPECT_FALSE(v.begin() == v.end());
EXPECT_FALSE(v.end() == v.begin());
EXPECT_TRUE(v.begin() != v.end());
EXPECT_TRUE(v.end() != v.begin());
EXPECT_FALSE(std::ranges::cbegin(v) == std::ranges::cend(v));
EXPECT_FALSE(std::ranges::cend(v) == std::ranges::cbegin(v));
EXPECT_TRUE(std::ranges::cbegin(v) != std::ranges::cend(v));
EXPECT_TRUE(std::ranges::cend(v) != std::ranges::cbegin(v));
auto it = v.begin();
EXPECT_EQ(*it, 'A');
// random access iterator
++it;
EXPECT_EQ(*it, 'A');
it++;
EXPECT_EQ(*it, 'A');
--it;
EXPECT_EQ(*it, 'A');
it--;
EXPECT_EQ(*it, 'A');
it = it + 1;
EXPECT_EQ(*it, 'A');
it = 1 + it;
EXPECT_EQ(*it, 'A');
it += 1;
EXPECT_EQ(*it, 'A');
it = it - 1;
EXPECT_EQ(*it, 'A');
it = 1 - it;
EXPECT_EQ(*it, 'A');
it -= 1;
EXPECT_EQ(*it, 'A');
auto diff = (v.begin() + 1) - v.begin();
EXPECT_EQ(diff, 1);
// assignment
*it = 'X';
EXPECT_EQ(*it, 'X');
auto cit = std::ranges::cbegin(v);
cit = v.begin(); // assign it from const it
}
TEST(general, subscript_operator)
{
auto v = seqan3::views::repeat('A');
EXPECT_EQ(v[0], 'A');
EXPECT_EQ(v[126], 'A');
EXPECT_EQ(v[78'634'126], 'A');
v[234] = 'X';
EXPECT_EQ(v[0], 'X');
EXPECT_EQ(v[126], 'X');
EXPECT_EQ(v[78'634'126], 'X');
}
TEST(view, factory)
{
// const char
{
char const chr{'X'};
auto v = seqan3::views::repeat(chr);
EXPECT_EQ(*v.begin(), chr);
}
// string
{
std::string str{"foobar"};
auto v = seqan3::views::repeat(str);
EXPECT_EQ(*v.begin(), str);
EXPECT_EQ(v[2345], str);
}
// view
{
std::string const input{"foobar"};
auto view = std::views::take(input, 3);
auto v = seqan3::views::repeat(view);
EXPECT_RANGE_EQ(*v.begin(), view);
}
// combinability
{
std::string str{"foobar"};
auto v = seqan3::views::repeat(str) | std::views::take(3);
using it_t = std::ranges::iterator_t<decltype(v)>;
// Note: std::views::take doesn't handle infinite std::ranges::random_access_range's that are not
// std::ranges::sized_range, so we can't use std::ranges::size() to compute the size.
// See https://eel.is/c++draft/range.take.view
it_t it = v.begin();
it_t sentinel = std::ranges::next(v.begin(), v.end()); // unfortunately linear in time
auto size = sentinel - it;
EXPECT_EQ(*it, str);
EXPECT_EQ(size, 3u);
}
}
constexpr char constexpr_class_and_iterator()
{
auto v = seqan3::views::repeat('A');
auto it = v.begin();
++it;
it[234] = 'X';
return *it;
}
constexpr char constexpr_view()
{
char chr{'A'};
auto v = seqan3::views::repeat(chr);
v[1324] = 'X';
return *v.begin();
}
TEST(general, constexpr_context)
{
{
constexpr char val = constexpr_class_and_iterator();
EXPECT_EQ(val, 'X');
}
{
constexpr char val = constexpr_view();
EXPECT_EQ(val, 'X');
}
}
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