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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 <gtest/gtest.h>
#include <fstream>
#include <iostream>
#include <seqan3/std/ranges>
#include <seqan3/alphabet/nucleotide/dna5.hpp>
#include <seqan3/core/char_operations/predicate.hpp>
#include <seqan3/range/views/char_to.hpp>
#include <seqan3/range/views/complement.hpp>
#include <seqan3/range/views/istreambuf.hpp>
#include <seqan3/range/views/take_until.hpp>
#include <seqan3/range/views/to.hpp>
#include <seqan3/test/expect_range_eq.hpp>
#include <seqan3/test/tmp_filename.hpp>
#include "../iterator_test_template.hpp"
using seqan3::operator""_dna5;
using iterator_type = decltype(seqan3::views::istreambuf(std::declval<std::istringstream &>()).begin());
template <>
struct iterator_fixture<iterator_type> : public ::testing::Test
{
using iterator_tag = std::input_iterator_tag;
static constexpr bool const_iterable = false;
std::string expected_range{"ACGTATATATAT ATATAT TTA \n AUAUAA"};
std::istringstream is{expected_range};
decltype(seqan3::views::istreambuf(is)) test_range = seqan3::views::istreambuf(is);
};
using test_type = ::testing::Types<iterator_type>;
INSTANTIATE_TYPED_TEST_SUITE_P(iterator_fixture, iterator_fixture, test_type, );
TEST(view_istreambuf, basic)
{
std::string data{"ACGTATATATAT ATATAT TTA \n AUAUAA"};
std::istringstream is{data};
// construct from istream:
auto v1 = seqan3::views::istreambuf(is);
size_t i = 0;
for (auto c : v1)
EXPECT_EQ(c, data[i++]);
EXPECT_EQ(i, data.size());
// construct from streambuf
is.clear();
is.seekg(0, std::ios::beg);
auto v2 = seqan3::views::istreambuf(*is.rdbuf());
i = 0;
for (auto c : v2)
EXPECT_EQ(c, data[i++]);
EXPECT_EQ(i, data.size());
// combinability
is.clear();
is.seekg(0, std::ios::beg);
auto v3 = seqan3::views::istreambuf(is) | seqan3::views::char_to<seqan3::dna5> | seqan3::views::complement;
std::vector<seqan3::dna5> comp{"TGCATATATATANTATATANAATNNNTATATT"_dna5};
EXPECT_RANGE_EQ(v3, comp);
// combinability 2
is.clear();
is.seekg(0, std::ios::beg);
auto v4 = seqan3::views::istreambuf(is) | seqan3::views::take_until(seqan3::is_space);
std::string out2 = v4 | seqan3::views::to<std::string>;
std::string comp2 = "ACGTATATATAT";
EXPECT_RANGE_EQ(out2, comp2);
}
TEST(view_istreambuf, concepts)
{
std::string data{""};
std::istringstream is{data};
auto v1 = seqan3::views::istreambuf(is);
EXPECT_TRUE(std::ranges::input_range<decltype(v1)>);
EXPECT_FALSE(std::ranges::forward_range<decltype(v1)>);
EXPECT_FALSE(std::ranges::bidirectional_range<decltype(v1)>);
EXPECT_FALSE(std::ranges::random_access_range<decltype(v1)>);
EXPECT_TRUE(std::ranges::view<decltype(v1)>);
EXPECT_FALSE(std::ranges::sized_range<decltype(v1)>);
EXPECT_FALSE(std::ranges::common_range<decltype(v1)>);
EXPECT_TRUE(seqan3::const_iterable_range<decltype(v1)>);
EXPECT_FALSE((std::ranges::output_range<decltype(v1), char>));
}
TEST(view_istreambuf, big_file_stram)
{
seqan3::test::tmp_filename file_name{"istream_storage"};
{
std::ofstream os{file_name.get_path()};
for (size_t idx = 0; idx < 11000 ; ++idx)
os << "halloballo\n";
}
std::ifstream istream{file_name.get_path()};
auto v = seqan3::views::istreambuf(istream);
while (v.begin() != v.end())
{
EXPECT_RANGE_EQ(v | seqan3::views::take_until_or_throw_and_consume(seqan3::is_char<'\n'>),
std::string_view{"halloballo"});
}
}
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