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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>
// make sure that including the std header does not produce any errors
// see https://github.com/seqan/seqan3/issues/2352
#include <charconv>
#include <cmath>
#include <concepts>
#include <iostream>
#include <limits>
#include <seqan3/std/charconv>
// =============================================================================
// std::from_chars for integral types
// =============================================================================
template <typename T>
class integral_from_char_test : public ::testing::Test
{};
using integral_types = ::testing::Types<int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, int64_t, uint64_t>;
TYPED_TEST_SUITE(integral_from_char_test, integral_types, );
TYPED_TEST(integral_from_char_test, postive_number)
{
TypeParam value{42};
{
std::vector<char> const str{'1', '2', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(value, TypeParam{123});
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc{});
}
{
std::vector<char> const str{'0', '2', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(value, TypeParam{23});
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc{});
}
// Read only up to a certain point
{
std::vector<char> const str{'0', '2', '3', '4', '5', '6'};
auto res = std::from_chars(&str[0], &str[0] + 3, value);
EXPECT_EQ(value, TypeParam{23});
EXPECT_EQ(res.ptr, &str[0] + 3);
EXPECT_EQ(res.ec, std::errc{});
}
}
TYPED_TEST(integral_from_char_test, negative_number)
{
TypeParam value{42};
std::vector<char> const str{'-', '1', '2', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
if constexpr (std::unsigned_integral<TypeParam>)
{
EXPECT_EQ(res.ptr, &str[0]);
EXPECT_EQ(res.ec, std::errc::invalid_argument);
EXPECT_EQ(value, TypeParam{42});
}
else
{
EXPECT_EQ(value, TypeParam{-123});
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc{});
}
}
TYPED_TEST(integral_from_char_test, overflow_error)
{
TypeParam value{42};
std::vector<char> const str{'1', '2', '3', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc::result_out_of_range);
EXPECT_EQ(value, TypeParam{42});
}
TYPED_TEST(integral_from_char_test, partial_parsing)
{
TypeParam value{42};
{ // interleaved char
std::vector<char> const str{'1', 'a', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(res.ptr, &str[1]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{1});
}
value = 42; // reset
{ // trailing char
std::vector<char> const str{'1', '2', 'a'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(res.ptr, &str[2]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{12});
}
value = 42; // reset
{ // float
std::vector<char> const str{'1', '.', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(res.ptr, &str[1]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{1});
}
{ // hexadecimal 0x prefix is not recognized
std::vector<char> const str{'0', 'x', '3', 'f'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value, 16);
EXPECT_EQ(res.ptr, &str[1]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{0});
}
{ // hexadecimal 0X prefix is not recognized
std::vector<char> const str{'0', 'X', '3', 'f'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value, 16);
EXPECT_EQ(res.ptr, &str[1]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{0});
}
}
TYPED_TEST(integral_from_char_test, invalid_argument_error)
{
TypeParam value{42};
{ // leading char
std::vector<char> const str{'a', '1', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(res.ptr, &str[0]);
EXPECT_EQ(res.ec, std::errc::invalid_argument);
EXPECT_EQ(value, TypeParam{42});
}
{ // leading + sign (or do we want this to succeed?)
std::vector<char> const str{'+', '1', '3'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value);
EXPECT_EQ(res.ptr, &str[0]);
EXPECT_EQ(res.ec, std::errc::invalid_argument);
EXPECT_EQ(value, TypeParam{42});
}
{ // hexadecimal x prefix is not recognized
std::vector<char> const str{'x', '3', 'f'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value, 16);
EXPECT_EQ(res.ptr, &str[0]);
EXPECT_EQ(res.ec, std::errc::invalid_argument);
EXPECT_EQ(value, TypeParam{42});
}
}
TYPED_TEST(integral_from_char_test, binary_number)
{
TypeParam value{42};
std::vector<char> const str{'1', '1', '0', '1'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value, 2);
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{13});
}
TYPED_TEST(integral_from_char_test, hexadicimal_number)
{
TypeParam value{42};
{
// NOTE: According to cppreference (03.10.2018)
// https://en.cppreference.com/w/cpp/utility/from_chars
// uppercase letter should not be recognised so this test might need to
// be updated when <charconv> header is included into the stl.
std::vector<char> const str{'3', 'F'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value, 16);
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{63});
}
value = 42; // reset
{
std::vector<char> const str{'3', 'f'};
auto res = std::from_chars(&str[0], &str[0] + str.size(), value, 16);
EXPECT_EQ(res.ptr, &str[0] + str.size());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(value, TypeParam{63});
}
}
// =============================================================================
// std::to_chars for integral types
// =============================================================================
TYPED_TEST(integral_from_char_test, to_chars)
{
uint8_t max_num_digits = static_cast<uint8_t>(std::log10(std::numeric_limits<TypeParam>::max())) + 1;
std::array<char, 21> buffer{}; // num_digits of uint64_t is 20 and we want to do buffer[num_digits]
TypeParam val{0};
for (uint8_t num_digits = 1; num_digits <= max_num_digits; ++num_digits)
{
// 1, 12, 123, 1234, 12345, ....
val *= 10;
val += num_digits % 10;
auto res = std::to_chars(buffer.data(), buffer.data() + buffer.size(), val);
EXPECT_EQ(res.ptr, &buffer[num_digits]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ((std::string_view{buffer.data(), num_digits}), std::string_view{std::to_string(val)});
}
}
TYPED_TEST(integral_from_char_test, to_chars_small_value)
{
TypeParam val{120};
std::array<char, 10> buffer{};
auto res = std::to_chars(buffer.data(), buffer.data() + buffer.size(), val);
EXPECT_EQ(res.ptr, &buffer[3]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ((std::string_view{buffer.data(), 3}), std::string_view{"120"});
}
TYPED_TEST(integral_from_char_test, to_chars_error)
{
TypeParam val{120};
std::array<char, 1> buffer{};
auto res = std::to_chars(buffer.data(), buffer.data() + buffer.size(), val);
EXPECT_EQ(res.ptr, buffer.data() + buffer.size());
EXPECT_EQ(res.ec, std::errc::value_too_large);
}
// https://github.com/seqan/seqan3/issues/1595
TEST(to_chars_test, issue_1595)
{
uint64_t val{123'456'789};
std::array<char, 100> buffer{};
auto res = std::to_chars(buffer.data(), buffer.data() + buffer.size(), val);
EXPECT_EQ(res.ptr, &buffer[9]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ((std::string_view{buffer.data(), 9}), std::string_view{"123456789"});
}
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