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// -----------------------------------------------------------------------------------------------------
// Copyright (c) 2006-2020, Knut Reinert & Freie Universität Berlin
// Copyright (c) 2016-2020, Knut Reinert & MPI für molekulare Genetik
// This file may be used, modified and/or redistributed under the terms of the 3-clause BSD-License
// shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
// -----------------------------------------------------------------------------------------------------
#include <deque>
#include <iostream>
#include <list>
#include <string>
#include <vector>
#include <gtest/gtest.h>
#include <range/v3/view/unique.hpp>
#include <seqan3/range/concept.hpp>
#include <seqan3/range/container/concept.hpp>
#include <seqan3/range/views/single_pass_input.hpp>
#include <seqan3/range/views/take.hpp>
#include <seqan3/range/views/take_exactly.hpp>
#include <seqan3/range/views/to.hpp>
#include <seqan3/std/algorithm>
#include <seqan3/std/concepts>
#include <seqan3/std/ranges>
#include <seqan3/test/expect_range_eq.hpp>
// ============================================================================
// test templates
// ============================================================================
template <typename adaptor_t>
void do_test(adaptor_t const & adaptor, std::string const & vec)
{
// pipe notation
auto v = vec | adaptor(3);
EXPECT_EQ("foo", v | seqan3::views::to<std::string>);
// iterators (code coverage)
EXPECT_EQ(v.begin(), v.begin());
EXPECT_NE(v.begin(), v.end());
// function notation
std::string v2{adaptor(vec, 3) | seqan3::views::to<std::string>};
EXPECT_EQ("foo", v2);
// combinability
auto v3 = vec | adaptor(3) | adaptor(3) | ranges::views::unique;
EXPECT_EQ("fo", v3 | seqan3::views::to<std::string>);
std::string v3b = vec | std::views::reverse | adaptor(3) | ranges::views::unique | seqan3::views::to<std::string>;
EXPECT_EQ("rab", v3b);
// comparability against self
EXPECT_RANGE_EQ(v, v);
}
template <typename adaptor_t>
void do_concepts(adaptor_t && adaptor, bool const exactly)
{
std::vector vec{1, 2, 3};
EXPECT_TRUE(std::ranges::input_range<decltype(vec)>);
EXPECT_TRUE(std::ranges::forward_range<decltype(vec)>);
EXPECT_TRUE(std::ranges::bidirectional_range<decltype(vec)>);
EXPECT_TRUE(std::ranges::random_access_range<decltype(vec)>);
EXPECT_FALSE(std::ranges::view<decltype(vec)>);
EXPECT_TRUE(std::ranges::sized_range<decltype(vec)>);
EXPECT_TRUE(std::ranges::common_range<decltype(vec)>);
EXPECT_TRUE(seqan3::const_iterable_range<decltype(vec)>);
EXPECT_TRUE((std::ranges::output_range<decltype(vec), int>));
auto v1 = vec | adaptor;
EXPECT_TRUE(std::ranges::input_range<decltype(v1)>);
EXPECT_TRUE(std::ranges::forward_range<decltype(v1)>);
EXPECT_TRUE(std::ranges::bidirectional_range<decltype(v1)>);
EXPECT_TRUE(std::ranges::random_access_range<decltype(v1)>);
EXPECT_TRUE(std::ranges::view<decltype(v1)>);
EXPECT_TRUE(std::ranges::sized_range<decltype(v1)>);
EXPECT_TRUE(std::ranges::common_range<decltype(v1)>);
EXPECT_TRUE(seqan3::const_iterable_range<decltype(v1)>);
EXPECT_TRUE((std::ranges::output_range<decltype(v1), int>));
auto v3 = vec | std::views::transform([] (auto && v) { return v; }) | adaptor;
EXPECT_TRUE(std::ranges::input_range<decltype(v3)>);
EXPECT_TRUE(std::ranges::forward_range<decltype(v3)>);
EXPECT_TRUE(std::ranges::bidirectional_range<decltype(v3)>);
EXPECT_TRUE(std::ranges::random_access_range<decltype(v3)>);
EXPECT_TRUE(std::ranges::view<decltype(v3)>);
EXPECT_TRUE(std::ranges::sized_range<decltype(v3)>);
EXPECT_TRUE(std::ranges::common_range<decltype(v3)>);
EXPECT_TRUE(seqan3::const_iterable_range<decltype(v3)>);
EXPECT_FALSE((std::ranges::output_range<decltype(v3), int>));
auto v2 = vec | seqan3::views::single_pass_input | adaptor;
EXPECT_TRUE(std::ranges::input_range<decltype(v2)>);
EXPECT_FALSE(std::ranges::forward_range<decltype(v2)>);
EXPECT_FALSE(std::ranges::bidirectional_range<decltype(v2)>);
EXPECT_FALSE(std::ranges::random_access_range<decltype(v2)>);
EXPECT_TRUE(std::ranges::view<decltype(v2)>);
EXPECT_EQ(std::ranges::sized_range<decltype(v2)>, exactly);
EXPECT_FALSE(std::ranges::common_range<decltype(v2)>);
EXPECT_FALSE(seqan3::const_iterable_range<decltype(v2)>);
EXPECT_TRUE((std::ranges::output_range<decltype(v2), int>));
// explicit test for non const-iterable views
// https://github.com/seqan/seqan3/pull/1734#discussion_r408829267
auto const & v2_cref = v2;
EXPECT_FALSE(std::ranges::input_range<decltype(v2_cref)>);
EXPECT_FALSE(std::ranges::forward_range<decltype(v2_cref)>);
EXPECT_FALSE(std::ranges::bidirectional_range<decltype(v2_cref)>);
EXPECT_FALSE(std::ranges::random_access_range<decltype(v2_cref)>);
EXPECT_FALSE(std::ranges::view<decltype(v2_cref)>);
EXPECT_FALSE(std::ranges::sized_range<decltype(v2_cref)>);
EXPECT_FALSE(std::ranges::common_range<decltype(v2_cref)>);
EXPECT_FALSE(seqan3::const_iterable_range<decltype(v2_cref)>);
EXPECT_FALSE((std::ranges::output_range<decltype(v2_cref), int>));
}
// ============================================================================
// view_take
// ============================================================================
TEST(view_take, regular)
{
do_test(seqan3::views::take, "foobar");
}
TEST(view_take, concepts)
{
do_concepts(seqan3::views::take(3), false);
}
TEST(view_take, underlying_is_shorter)
{
std::string vec{"foo"};
EXPECT_NO_THROW(( seqan3::views::take(vec, 4) )); // no parsing
std::string v;
// full parsing on conversion
EXPECT_NO_THROW(( v = vec
| seqan3::views::single_pass_input
| seqan3::views::take(4)
| seqan3::views::to<std::string>));
EXPECT_EQ("foo", v);
}
TEST(view_take, type_erasure)
{
{ // string const overload
std::string const urange{"foobar"};
auto v = seqan3::views::take(urange, 3);
EXPECT_TRUE((std::same_as<decltype(v), std::string_view>));
EXPECT_RANGE_EQ(v, urange.substr(0,3));
}
{ // stringview overload
std::string_view urange{"foobar"};
auto v = seqan3::views::take(urange, 3);
EXPECT_TRUE((std::same_as<decltype(v), std::string_view>));
EXPECT_RANGE_EQ(v, urange.substr(0,3));
}
{ // contiguous overload
std::vector<int> urange{1, 2, 3, 4, 5, 6};
auto v = seqan3::views::take(urange, 3);
EXPECT_TRUE((std::same_as<decltype(v), std::span<int, std::dynamic_extent>>));
EXPECT_RANGE_EQ(v, (std::vector{1, 2, 3}));
}
{ // contiguous overload
std::array<int, 6> urange{1, 2, 3, 4, 5, 6};
auto v = seqan3::views::take(urange, 3);
EXPECT_TRUE((std::same_as<decltype(v), std::span<int, std::dynamic_extent>>));
EXPECT_RANGE_EQ(v, (std::vector{1, 2, 3}));
}
{ // random-access overload
std::deque<int> urange{1, 2, 3, 4, 5, 6};
auto v = seqan3::views::take(urange, 3);
EXPECT_TRUE((std::same_as<decltype(v), std::ranges::subrange<typename std::deque<int>::iterator,
typename std::deque<int>::iterator>>));
EXPECT_RANGE_EQ(v, (std::vector{1, 2, 3}));
}
{ // generic overload (bidirectional container)
std::list<int> urange{1, 2, 3, 4, 5, 6};
auto v = seqan3::views::take(urange, 3);
EXPECT_TRUE((std::same_as<decltype(v), seqan3::detail::view_take<std::views::all_t<std::list<int> &>,
false, false>>));
EXPECT_RANGE_EQ(v, (std::vector{1, 2, 3}));
}
{ // generic overload (view)
std::array<int, 6> urange{1, 2, 3, 4, 5, 6};
auto v = urange | std::views::filter([] (int) { return true; });
auto v2 = seqan3::views::take(v, 3);
EXPECT_TRUE((std::same_as<decltype(v2), seqan3::detail::view_take<decltype(v), false, false>>));
EXPECT_RANGE_EQ(v2, (std::vector{1, 2, 3}));
}
{ // generic overload (random access, non-sized, pointer as iterator)
std::array<int, 6> urange{1, 2, 3, 4, 5, 6};
auto v0 = std::span{urange};
auto v1 = v0 | std::views::take_while([] (int i) { return i < 6; });
auto v2 = seqan3::views::take(v1, 3);
EXPECT_TRUE((std::same_as<decltype(v2), seqan3::detail::view_take<decltype(v1), false, false>>));
EXPECT_RANGE_EQ(v2, (std::vector{1, 2, 3}));
}
}
// ============================================================================
// view_take_exactly
// ============================================================================
TEST(view_take_exactly, regular)
{
do_test(seqan3::views::take_exactly, "foobar");
}
TEST(view_take_exactly, concepts)
{
do_concepts(seqan3::views::take_exactly(3), true);
}
TEST(view_take_exactly, underlying_is_shorter)
{
std::string vec{"foo"};
EXPECT_NO_THROW(( seqan3::views::take_exactly(vec, 4) )); // no parsing
std::string v;
EXPECT_NO_THROW(( v = vec
| seqan3::views::single_pass_input
| seqan3::views::take_exactly(4)
| seqan3::views::to<std::string>)); // full parsing on conversion
EXPECT_EQ("foo", v);
auto v2 = vec | seqan3::views::single_pass_input | seqan3::views::take_exactly(4);
EXPECT_EQ(size(v2), 4u); // here be dragons
}
TEST(view_take_exactly, shrink_size_on_input_ranges)
{
std::string vec{"foobar"};
auto v = vec | seqan3::views::single_pass_input | seqan3::views::take_exactly(3);
EXPECT_EQ(std::ranges::size(v), 3u);
EXPECT_EQ(*std::ranges::begin(v), 'f');
auto it = std::ranges::begin(v);
++it;
EXPECT_EQ(std::ranges::size(v), 2u);
EXPECT_EQ(*std::ranges::begin(v), 'o');
++it;
++it;
EXPECT_EQ(std::ranges::size(v), 0u); // view is empty now
}
// ============================================================================
// view_take_exactly_or_throw
// ============================================================================
TEST(view_take_exactly_or_throw, regular)
{
do_test(seqan3::views::take_exactly_or_throw, "foo\nbar");
}
TEST(view_take_exactly_or_throw, concepts)
{
do_concepts(seqan3::views::take_exactly_or_throw(3), true);
}
TEST(view_take_exactly_or_throw, underlying_is_shorter)
{
std::string vec{"foo"};
EXPECT_THROW(( seqan3::views::take_exactly_or_throw(vec, 4) ),
std::invalid_argument); // no parsing, but throws in adaptor
std::list l{'f', 'o', 'o'};
EXPECT_THROW(( seqan3::detail::view_take<std::views::all_t<std::list<char> &>, true, true>(l, 4) ),
std::invalid_argument); // no parsing, but throws on construction
std::string v;
EXPECT_THROW(( v = vec
| seqan3::views::single_pass_input
| seqan3::views::take_exactly_or_throw(4)
| seqan3::views::to<std::string>),
seqan3::unexpected_end_of_input); // full parsing on conversion, throw on conversion
}
|
