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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 <iostream>
#include <limits>
#include <seqan3/std/charconv>
#include <seqan3/std/concepts>
// =============================================================================
// std::from_chars for float, double and long double
// =============================================================================
template <typename T>
class from_char_real_test: public ::testing::Test { };
using real_types = ::testing::Types<float, double, long double>;
TYPED_TEST_SUITE(from_char_real_test, real_types, );
TYPED_TEST(from_char_real_test, real_numbers)
{
std::setlocale(LC_NUMERIC, "C");
{
TypeParam val{};
std::string str = "1234";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{1234});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "1.2e3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{1200});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "1.2e-3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{0.0012});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "1.e2";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{100});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "1.";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{1});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = ".2e3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{200});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "2e3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{2000});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "2";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{2});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "4em";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{4});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + 1);
}
{
TypeParam val{};
std::string str = "-1.2e3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{-1200});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{42};
std::string str = "-.3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{-0.3});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{42};
std::string str = "1.2e";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{1.2});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + 3);
}
{
TypeParam val{42};
std::string str = "0.0";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{0});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
// Read only until a certain position
{
TypeParam val{42};
std::string str = "3.194357";
auto res = std::from_chars(&str[0], &str[0] + 4, val);
EXPECT_FLOAT_EQ(val, TypeParam{3.19});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + 4);
}
// Partial Parsing
{
TypeParam val{42};
std::string str = "3.19abc";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{3.19});
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + 4);
}
}
TYPED_TEST(from_char_real_test, infinity_value)
{
{
TypeParam val{};
std::string str = "inf";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_EQ(val, std::numeric_limits<TypeParam>::infinity());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "infinity";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_EQ(val, std::numeric_limits<TypeParam>::infinity());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "INF";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_EQ(val, std::numeric_limits<TypeParam>::infinity());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "INFINITY";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_EQ(val, std::numeric_limits<TypeParam>::infinity());
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
}
TYPED_TEST(from_char_real_test, nan_value)
{
// Note:
// According to the IEEE standard, NaN values have the odd property that
// comparisons involving them are always false. That is, for a float f,
// f != f will be true only if f is NaN.
{
TypeParam val{};
std::string str = "nan";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_TRUE(std::isnan(val));
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "NAN";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_TRUE(std::isnan(val));
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "nan(abc)";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_TRUE(std::isnan(val));
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
{
TypeParam val{};
std::string str = "NAN(abc)";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_TRUE(std::isnan(val));
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ(res.ptr, &str[0] + str.size());
}
}
TYPED_TEST(from_char_real_test, non_valid_strings)
{
{
TypeParam val{42};
std::string str = "e3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{42});
EXPECT_EQ(res.ec, std::errc::invalid_argument);
}
{
TypeParam val{42};
std::string str = "+1.2e3";
auto res = std::from_chars(&str[0], &str[0] + str.size(), val);
EXPECT_FLOAT_EQ(val, TypeParam{42});
EXPECT_EQ(res.ec, std::errc::invalid_argument);
}
}
// =============================================================================
// std::to_chars for float, double and long double
// =============================================================================
TYPED_TEST(from_char_real_test, to_chars)
{
TypeParam val{120.3};
std::array<char, 10> buffer{};
auto res = std::to_chars(buffer.data(), buffer.data() + buffer.size(), val);
EXPECT_EQ(res.ptr, &buffer[5]);
EXPECT_EQ(res.ec, std::errc{});
EXPECT_EQ((std::string_view{buffer.data(), 5}), std::string_view{"120.3"});
}
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