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etl/test/test_format.cpp
Roland Reichwein bbf74c5334
Optimize formatting in format.h for float values (#1379) 
When formatting float, fix the -0.0 case

format.h float format: Fix rounding issues on all platforms
2026-04-19 13:19:53 +02:00

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/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2025 BMW AG
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#include "unit_test_framework.h"
#include "etl/format.h"
#include "etl/iterator.h"
#if ETL_USING_CPP11
namespace
{
using iterator = etl::back_insert_iterator<etl::istring>;
template <class... Args>
etl::istring& test_format(etl::istring& s, etl::format_string<Args...> fmt, Args&&... args)
{
(void)etl::format_to(s, fmt, etl::forward<Args>(args)...);
return s;
}
SUITE(test_format)
{
//*************************************************************************
TEST(test_empty)
{
etl::string<100> s;
const char* result = etl::format_to(s, "");
CHECK_EQUAL(s.cbegin(), result);
CHECK_EQUAL("", s);
}
//*************************************************************************
TEST(test_format)
{
etl::string<100> s;
const char* result = etl::format_to(s, "abc");
CHECK_EQUAL(s.cbegin() + 3, result);
CHECK_EQUAL("abc", s);
}
//*************************************************************************
TEST(test_format_int)
{
etl::string<100> s;
CHECK_EQUAL("1", test_format(s, "{}", 1));
CHECK_EQUAL("123", test_format(s, "{}", 123));
CHECK_EQUAL("4123", test_format(s, "{}", 4123));
CHECK_EQUAL("1048962123", test_format(s, "{}", 1048962123));
CHECK_EQUAL("1 2", test_format(s, "{} {}", 1, 2));
CHECK_EQUAL("-123", test_format(s, "{}", -123));
CHECK_EQUAL("-314748364", test_format(s, "{}", (int)-314748364));
CHECK_EQUAL("2147483647", test_format(s, "{}", INT32_MAX));
CHECK_EQUAL("-2147483648", test_format(s, "{}", INT32_MIN));
CHECK_EQUAL("0", test_format(s, "{}", 0));
CHECK_EQUAL("-1", test_format(s, "{}", -1));
}
//*************************************************************************
TEST(test_format_short)
{
etl::string<100> s;
CHECK_EQUAL("1", test_format(s, "{}", static_cast<short>(1)));
CHECK_EQUAL("123", test_format(s, "{}", static_cast<short>(123)));
CHECK_EQUAL("4123", test_format(s, "{}", static_cast<short>(4123)));
CHECK_EQUAL("1 2", test_format(s, "{} {}", static_cast<short>(1), static_cast<short>(2)));
CHECK_EQUAL("-123", test_format(s, "{}", static_cast<short>(-123)));
CHECK_EQUAL("0", test_format(s, "{}", static_cast<short>(0)));
CHECK_EQUAL("-1", test_format(s, "{}", static_cast<short>(-1)));
}
//*************************************************************************
TEST(test_format_unsigned_short)
{
etl::string<100> s;
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned short>(1)));
CHECK_EQUAL("123", test_format(s, "{}", static_cast<unsigned short>(123)));
CHECK_EQUAL("4123", test_format(s, "{}", static_cast<unsigned short>(4123)));
CHECK_EQUAL("1 2", test_format(s, "{} {}", static_cast<unsigned short>(1), static_cast<unsigned short>(2)));
CHECK_EQUAL("60123", test_format(s, "{}", static_cast<unsigned short>(60123)));
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned short>(0)));
CHECK_EQUAL("65500", test_format(s, "{}", static_cast<unsigned short>(65500)));
}
//*************************************************************************
TEST(test_format_long_int)
{
etl::string<100> s;
CHECK_EQUAL("1", test_format(s, "{}", static_cast<long int>(1)));
CHECK_EQUAL("123", test_format(s, "{}", static_cast<long int>(123)));
CHECK_EQUAL("4123", test_format(s, "{}", static_cast<long int>(4123)));
CHECK_EQUAL("1 2", test_format(s, "{} {}", static_cast<long int>(1), static_cast<long int>(2)));
CHECK_EQUAL("-123", test_format(s, "{}", static_cast<long int>(-123)));
CHECK_EQUAL("0", test_format(s, "{}", static_cast<long int>(0)));
CHECK_EQUAL("-1", test_format(s, "{}", static_cast<long int>(-1)));
}
//*************************************************************************
TEST(test_format_unsigned_long_int)
{
etl::string<100> s;
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned long int>(1)));
CHECK_EQUAL("123", test_format(s, "{}", static_cast<unsigned long int>(123)));
CHECK_EQUAL("4123", test_format(s, "{}", static_cast<unsigned long int>(4123)));
CHECK_EQUAL("1 2", test_format(s, "{} {}", static_cast<unsigned long int>(1), static_cast<unsigned long int>(2)));
CHECK_EQUAL("60123", test_format(s, "{}", static_cast<unsigned long int>(60123)));
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned long int>(0)));
CHECK_EQUAL("65500", test_format(s, "{}", static_cast<unsigned long int>(65500)));
}
//*************************************************************************
TEST(test_format_unsigned_int)
{
etl::string<100> s;
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned int>(0U)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned int>(1U)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<unsigned int>(12345678U)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<unsigned int>(4123456780U)));
}
//*************************************************************************
TEST(test_format_long_long_int)
{
etl::string<100> s;
CHECK_EQUAL("-1", test_format(s, "{}", static_cast<long long int>(-1LL)));
CHECK_EQUAL("0", test_format(s, "{}", static_cast<long long int>(0LL)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<long long int>(1LL)));
CHECK_EQUAL("-12345678", test_format(s, "{}", static_cast<long long int>(-12345678LL)));
CHECK_EQUAL("-4123456780", test_format(s, "{}", static_cast<long long int>(-4123456780LL)));
CHECK_EQUAL("-123456781234", test_format(s, "{}", static_cast<long long int>(-123456781234LL)));
CHECK_EQUAL("-412345678012", test_format(s, "{}", static_cast<long long int>(-412345678012LL)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<long long int>(12345678LL)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<long long int>(4123456780LL)));
}
//*************************************************************************
TEST(test_format_unsigned_long_long_int)
{
etl::string<100> s;
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned long long int>(0LL)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned long long int>(1LL)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<unsigned long long int>(12345678LL)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<unsigned long long int>(4123456780LL)));
CHECK_EQUAL("18446744073709551615", test_format(s, "{}", static_cast<unsigned long long int>(18446744073709551615ULL)));
CHECK_EQUAL("1311768467463790320", test_format(s, "{}", static_cast<unsigned long long int>(0x123456789ABCDEF0ULL)));
}
//*************************************************************************
TEST(test_format_other_int)
{
etl::string<100> s;
// mapped to unsigned char
// CHECK_EQUAL("34", test_format(s, "{}", static_cast<uint8_t>(34)));
// mapped to signed char
// CHECK_EQUAL("-14", test_format(s, "{}", static_cast<int8_t>(-14)));
CHECK_EQUAL("6534", test_format(s, "{}", static_cast<uint16_t>(6534)));
CHECK_EQUAL("-9414", test_format(s, "{}", static_cast<int16_t>(-9414)));
CHECK_EQUAL("236534", test_format(s, "{}", static_cast<uint32_t>(236534)));
CHECK_EQUAL("-6759414", test_format(s, "{}", static_cast<int32_t>(-6759414)));
}
#if ETL_USING_FORMAT_FLOATING_POINT
//*************************************************************************
TEST(test_format_float)
{
etl::string<100> s;
CHECK_EQUAL("1.0", test_format(s, "{}", 1.0f));
CHECK_EQUAL("1.234567", test_format(s, "{}", 1.2345674f));
CHECK_EQUAL("1.234568", test_format(s, "{}", 1.2345676f));
CHECK_EQUAL("1.125", test_format(s, "{}", 1.125f));
}
//*************************************************************************
TEST(test_format_double)
{
etl::string<100> s;
CHECK_EQUAL("1.0", test_format(s, "{}", 1.0));
CHECK_EQUAL("1.234567", test_format(s, "{}", 1.234567499));
CHECK_EQUAL("1.234568", test_format(s, "{}", 1.234567501));
CHECK_EQUAL("1.5", test_format(s, "{}", 1.5));
}
//*************************************************************************
TEST(test_format_long_double)
{
etl::string<100> s;
CHECK_EQUAL("1.0", test_format(s, "{}", 1.0l));
auto& result = test_format(s, "{}", 1.234567l);
CHECK("1.234567" == result || "1.234566" == result);
CHECK_EQUAL("1.234568", test_format(s, "{}", 1.2345678l));
CHECK_EQUAL("1.25", test_format(s, "{}", 1.25l));
}
//*************************************************************************
TEST(test_format_float_presentation)
{
etl::string<100> s;
CHECK_EQUAL("1.000000e+00", test_format(s, "{:e}", 1.0f));
CHECK_EQUAL("1.125000E+00", test_format(s, "{:E}", 1.125f));
CHECK_EQUAL("-2.533324e-05", test_format(s, "{:e}", -0.00002533324f));
CHECK_EQUAL("-2.500000e+11", test_format(s, "{:e}", -250000000000.0f));
CHECK_EQUAL("1.000000", test_format(s, "{:f}", 1.0f));
CHECK_EQUAL("1.125000", test_format(s, "{:F}", 1.125f));
CHECK_EQUAL("1.000000", test_format(s, "{:g}", 1.0f));
CHECK_EQUAL("1.125000", test_format(s, "{:G}", 1.125f));
CHECK_EQUAL("1.000000e+10", test_format(s, "{:g}", 10000000000.0f));
CHECK_EQUAL("1.000000E+10", test_format(s, "{:G}", 10000000000.0f));
CHECK_EQUAL("nan", test_format(s, "{}", NAN));
CHECK_EQUAL("nan", test_format(s, "{:e}", NAN));
CHECK_EQUAL("NAN", test_format(s, "{:E}", NAN));
CHECK_EQUAL("nan", test_format(s, "{:f}", NAN));
CHECK_EQUAL("NAN", test_format(s, "{:F}", NAN));
CHECK_EQUAL("nan", test_format(s, "{:g}", NAN));
CHECK_EQUAL("NAN", test_format(s, "{:0.3G}", NAN));
CHECK_EQUAL("inf", test_format(s, "{}", INFINITY));
CHECK_EQUAL("inf", test_format(s, "{:e}", INFINITY));
CHECK_EQUAL("INF", test_format(s, "{:E}", INFINITY));
CHECK_EQUAL("inf", test_format(s, "{:f}", INFINITY));
CHECK_EQUAL("INF", test_format(s, "{:F}", INFINITY));
CHECK_EQUAL("inf", test_format(s, "{:g}", INFINITY));
CHECK_EQUAL("INF", test_format(s, "{:0.3G}", INFINITY));
CHECK_EQUAL("0x1.8p+0", test_format(s, "{:a}", 1.5f));
CHECK_EQUAL("0X1.4CCCCCCCCDP+0", test_format(s, "{:A}", 1.3l));
CHECK_EQUAL("0x2.49fp+4", test_format(s, "{:a}", 150000.0));
CHECK_EQUAL("0x1.92a738p-5", test_format(s, "{:a}", 0.0000015f));
CHECK_EQUAL("0x1.6345785d8ap+e", test_format(s, "{:a}", 100000000000000000.l));
}
//*************************************************************************
TEST(test_format_negative_zero)
{
etl::string<100> s;
// Test negative zero handling - signbit() correctly detects -0.0
CHECK_EQUAL("-0.0", test_format(s, "{}", -0.0));
CHECK_EQUAL("-0.0", test_format(s, "{}", -0.0f));
CHECK_EQUAL("-0.0", test_format(s, "{}", -0.0L));
CHECK_EQUAL("-0.000000", test_format(s, "{:f}", -0.0));
CHECK_EQUAL("-0.000000", test_format(s, "{:f}", -0.0f));
CHECK_EQUAL("-0.000000", test_format(s, "{:f}", -0.0L));
CHECK_EQUAL("-0.000000e+00", test_format(s, "{:e}", -0.0));
CHECK_EQUAL("-0.000000e+00", test_format(s, "{:e}", -0.0f));
CHECK_EQUAL("-0.000000e+00", test_format(s, "{:e}", -0.0L));
CHECK_EQUAL("-0x0.0p+0", test_format(s, "{:a}", -0.0));
CHECK_EQUAL("-0x0.0p+0", test_format(s, "{:a}", -0.0f));
CHECK_EQUAL("-0x0.0p+0", test_format(s, "{:a}", -0.0L));
}
//*************************************************************************
// Tests for fractional rounding carry:
// When round(fractional * scale) == scale the fractional part must wrap
// to 0 and the integral part must be incremented by 1.
//*************************************************************************
TEST(test_format_floating_default_rounding_carry)
{
etl::string<100> s;
// 1.9999999: fractional 0.9999999, round(0.9999999 * 1e6) == 1000000
// => must carry: integral 1 -> 2, fractional -> 0
CHECK_EQUAL("2.0", test_format(s, "{}", 1.9999999));
CHECK_EQUAL("-2.0", test_format(s, "{}", -1.9999999));
// 0.9999999: integral 0, fractional rounds up => becomes 1.0
CHECK_EQUAL("1.0", test_format(s, "{}", 0.9999999));
// 99.9999999: integral 99, fractional rounds up => becomes 100.0
CHECK_EQUAL("100.0", test_format(s, "{}", 99.9999999));
}
//*************************************************************************
TEST(test_format_floating_f_rounding_carry)
{
etl::string<100> s;
// Same values using {:f} which uses format_floating_f (6 fractional decimals)
CHECK_EQUAL("2.000000", test_format(s, "{:f}", 1.9999999));
CHECK_EQUAL("-2.000000", test_format(s, "{:f}", -1.9999999));
CHECK_EQUAL("1.000000", test_format(s, "{:f}", 0.9999999));
CHECK_EQUAL("100.000000", test_format(s, "{:f}", 99.9999999));
}
//*************************************************************************
TEST(test_format_floating_e_rounding_carry)
{
etl::string<100> s;
// 9.9999999: after normalization integral=9, fractional=0.9999999
// round(0.9999999 * 1e6) == 1000000 => must carry: 10.000000e+00
CHECK_EQUAL("10.000000e+00", test_format(s, "{:e}", 9.9999999));
CHECK_EQUAL("-10.000000e+00", test_format(s, "{:e}", -9.9999999));
// 1.9999999: after normalization integral=1, fractional=0.9999999
CHECK_EQUAL("2.000000e+00", test_format(s, "{:e}", 1.9999999));
}
//*************************************************************************
TEST(test_format_floating_a_rounding_carry)
{
etl::string<100> s;
// 1.5 + (1.0 - 2^-52) * 0.5 ≈ value whose hex fractional part rounds up.
// Use a value where hex fractional is all 0xF...F and rounds up.
// 2.0 - epsilon: in hex, 0x1.FFFFFFFFFFFFFp+0 (for double)
// After modf: integral=1, fractional ≈ 0.999...
// round(fractional * 16^10) should equal 16^10 => carry
double almost_two = 1.9999999999999998; // nextafter(2.0, 0.0) or very close
auto& result = test_format(s, "{:a}", almost_two);
// After carry, integral becomes 2, fractional becomes 0
CHECK_EQUAL("0x2.0p+0", result);
}
#endif
//*************************************************************************
TEST(test_format_char_array)
{
etl::string<100> s;
CHECK_EQUAL("s", test_format(s, "{}", "s"));
CHECK_EQUAL("abcd", test_format(s, "{}", "abcd"));
}
//*************************************************************************
TEST(test_format_char)
{
etl::string<100> s;
CHECK_EQUAL("a s b", test_format(s, "a {} b", 's'));
CHECK_EQUAL("a s b", test_format(s, "a {:c} b", 's'));
CHECK_EQUAL("a 's' b", test_format(s, "a {:?} b", 's'));
CHECK_EQUAL("a \t b", test_format(s, "a {} b", '\t'));
CHECK_EQUAL("a '\\t' b", test_format(s, "a {:?} b", '\t'));
CHECK_EQUAL("a '\\n' b", test_format(s, "a {:?} b", '\n'));
CHECK_EQUAL("a '\\r' b", test_format(s, "a {:?} b", '\r'));
CHECK_EQUAL("a '\\\"' b", test_format(s, "a {:?} b", '"'));
CHECK_EQUAL("a '\\'' b", test_format(s, "a {:?} b", '\''));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", '\\'));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", '\\'));
CHECK_EQUAL("a 97 b", test_format(s, "a {:d} b", 'a'));
CHECK_EQUAL("a 61 b", test_format(s, "a {:X} b", 'a'));
CHECK_EQUAL("a 61 b", test_format(s, "a {:x} b", 'a'));
CHECK_EQUAL("a 0x61 b", test_format(s, "a {:#x} b", 'a'));
}
//*************************************************************************
TEST(test_format_bool)
{
etl::string<100> s;
CHECK_EQUAL("1false2true3", test_format(s, "1{}2{}3", false, true));
CHECK_EQUAL("true", test_format(s, "{:s}", true));
CHECK_EQUAL("1", test_format(s, "{:d}", true));
CHECK_EQUAL("1", test_format(s, "{:X}", true));
CHECK_EQUAL("01", test_format(s, "{:#o}", true));
CHECK_EQUAL(" true", test_format(s, "{:10}", true));
}
//*************************************************************************
TEST(test_format_string_view)
{
etl::string<100> s;
etl::string_view sv("data1");
CHECK_EQUAL("data1", test_format(s, "{}", sv));
CHECK_EQUAL("data1", test_format(s, "{:s}", sv));
CHECK_THROW(test_format(s, "{:d}", sv), etl::bad_format_string_exception);
CHECK_EQUAL("data1 ", test_format(s, "{:10s}", sv));
CHECK_EQUAL("data1 ", test_format(s, "{:<10s}", sv));
CHECK_EQUAL(" data1", test_format(s, "{:>10s}", sv));
CHECK_EQUAL(" data1 ", test_format(s, "{:^10s}", sv));
CHECK_EQUAL("data1", test_format(s, "{:3}", sv));
CHECK_EQUAL("dat", test_format(s, "{:.3s}", sv));
CHECK_EQUAL("dat", test_format(s, "{:^.3s}", sv));
CHECK_EQUAL(". dat !", test_format(s, ".{:^8.3s}!", sv));
CHECK_EQUAL("^dat $", test_format(s, "^{:8.3s}$", sv));
}
//*************************************************************************
TEST(test_format_string_view_escaped)
{
etl::string<100> s;
etl::string_view sv("data1\n");
CHECK_EQUAL("\"data1\\n\"", test_format(s, "{:?}", sv));
}
//*************************************************************************
TEST(test_format_string)
{
etl::string<100> s;
etl::string<10> s_arg = "data1";
CHECK_EQUAL("data1", test_format(s, "{}", s_arg));
CHECK_EQUAL("data1", test_format(s, "{:s}", s_arg));
CHECK_THROW(test_format(s, "{:d}", s_arg), etl::bad_format_string_exception);
CHECK_EQUAL("data1 ", test_format(s, "{:10s}", s_arg));
CHECK_EQUAL("data1 ", test_format(s, "{:<10s}", s_arg));
CHECK_EQUAL(" data1", test_format(s, "{:>10s}", s_arg));
CHECK_EQUAL(" data1 ", test_format(s, "{:^10s}", s_arg));
CHECK_EQUAL("data1", test_format(s, "{:3}", s_arg));
CHECK_EQUAL("dat", test_format(s, "{:.3s}", s_arg));
CHECK_EQUAL("dat", test_format(s, "{:^.3s}", s_arg));
CHECK_EQUAL(". dat !", test_format(s, ".{:^8.3s}!", s_arg));
CHECK_EQUAL("^dat $", test_format(s, "^{:8.3s}$", s_arg));
}
//*************************************************************************
// this minimal derived class of etl::string is used to prove that the
// temporary lifetime is long enough for the format operation
template <size_t N>
class clearing_string : public etl::string<N>
{
public:
using etl::string<N>::string;
~clearing_string()
{
this->clear();
}
};
TEST(test_format_string_temporary)
{
etl::string<100> s;
const char* data = "data1";
using string_t = clearing_string<10>;
CHECK_EQUAL("data1", test_format(s, "{}", string_t(data)));
CHECK_EQUAL("data1", test_format(s, "{:s}", string_t(data)));
CHECK_THROW(test_format(s, "{:d}", string_t(data)), etl::bad_format_string_exception);
CHECK_EQUAL("data1 ", test_format(s, "{:10s}", string_t(data)));
CHECK_EQUAL("data1 ", test_format(s, "{:<10s}", string_t(data)));
CHECK_EQUAL(" data1", test_format(s, "{:>10s}", string_t(data)));
CHECK_EQUAL(" data1 ", test_format(s, "{:^10s}", string_t(data)));
CHECK_EQUAL("data1", test_format(s, "{:3}", string_t(data)));
CHECK_EQUAL("dat", test_format(s, "{:.3s}", string_t(data)));
CHECK_EQUAL("dat", test_format(s, "{:^.3s}", string_t(data)));
CHECK_EQUAL(". dat !", test_format(s, ".{:^8.3s}!", string_t(data)));
CHECK_EQUAL("^dat $", test_format(s, "^{:8.3s}$", string_t(data)));
}
//*************************************************************************
TEST(test_format_string_escaped)
{
etl::string<100> s;
etl::string<10> s_arg("data1\n");
CHECK_EQUAL("\"data1\\n\"", test_format(s, "{:?}", s_arg));
}
//*************************************************************************
TEST(test_format_chars)
{
etl::string<100> s;
const char* chars = "data1";
CHECK_EQUAL("data1", test_format(s, "{}", chars));
CHECK_EQUAL("data1", test_format(s, "{:s}", chars));
CHECK_THROW(test_format(s, "{:d}", chars), etl::bad_format_string_exception);
CHECK_EQUAL("data1 ", test_format(s, "{:10s}", chars));
CHECK_EQUAL("data1 ", test_format(s, "{:<10s}", chars));
CHECK_EQUAL(" data1", test_format(s, "{:>10s}", chars));
CHECK_EQUAL(" data1 ", test_format(s, "{:^10s}", chars));
CHECK_EQUAL("data1", test_format(s, "{:3}", chars));
CHECK_EQUAL("dat", test_format(s, "{:.3s}", chars));
CHECK_EQUAL("dat", test_format(s, "{:^.3s}", chars));
CHECK_EQUAL(". dat !", test_format(s, ".{:^8.3s}!", chars));
CHECK_EQUAL("^dat $", test_format(s, "^{:8.3s}$", chars));
}
//*************************************************************************
TEST(test_format_chars_escaped)
{
etl::string<100> s;
const char* chars = "data2\n";
CHECK_EQUAL("\"data2\\n\"", test_format(s, "{:?}", chars));
}
//*************************************************************************
TEST(test_format_pointer)
{
etl::string<100> s;
void* p = nullptr;
CHECK_EQUAL("0x0", test_format(s, "{}", p));
CHECK_EQUAL("0x0", test_format(s, "{:p}", p));
CHECK_EQUAL("0X0", test_format(s, "{:P}", p));
if (sizeof(uintptr_t) == 8)
{
p = reinterpret_cast<void*>(0x123456789abcdef0ULL);
CHECK_EQUAL("0x123456789abcdef0", test_format(s, "{:p}", p));
CHECK_EQUAL("0X123456789ABCDEF0", test_format(s, "{:P}", p));
}
else if (sizeof(uintptr_t) == 4)
{
p = reinterpret_cast<void*>(0x1abcdef0ULL);
CHECK_EQUAL("0x1abcdef0", test_format(s, "{:p}", p));
CHECK_EQUAL("0X1ABCDEF0", test_format(s, "{:P}", p));
}
}
//*************************************************************************
TEST(test_format_size_t)
{
etl::string<100> s;
CHECK_EQUAL("0", test_format(s, "{}", static_cast<size_t>(0LL)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<size_t>(1LL)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<size_t>(12345678LL)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<size_t>(4123456780LL)));
#if ETL_PLATFORM_64BIT
static_assert(sizeof(size_t) == 8, "size_t is expected to be 64 bit on 64 bit platforms");
CHECK_EQUAL("18446744073709551615", test_format(s, "{}", static_cast<size_t>(18446744073709551615ULL)));
CHECK_EQUAL("1311768467463790320", test_format(s, "{}", static_cast<size_t>(0x123456789ABCDEF0ULL)));
#endif
}
//*************************************************************************
TEST(test_format_unsigned_long)
{
etl::string<100> s;
CHECK_EQUAL("0", test_format(s, "{}", static_cast<unsigned long>(0LL)));
CHECK_EQUAL("1", test_format(s, "{}", static_cast<unsigned long>(1LL)));
CHECK_EQUAL("12345678", test_format(s, "{}", static_cast<unsigned long>(12345678LL)));
CHECK_EQUAL("4123456780", test_format(s, "{}", static_cast<unsigned long>(4123456780LL)));
#if ETL_PLATFORM_64BIT
static_assert(sizeof(unsigned long) == 8, "size_t is expected to be 64 bit on 64 bit platforms");
CHECK_EQUAL("18446744073709551615", test_format(s, "{}", static_cast<unsigned long>(18446744073709551615ULL)));
CHECK_EQUAL("1311768467463790320", test_format(s, "{}", static_cast<unsigned long>(0x123456789ABCDEF0ULL)));
#endif
}
//*************************************************************************
TEST(test_format_signed_char)
{
etl::string<100> s;
CHECK_EQUAL("a s b", test_format(s, "a {} b", static_cast<signed char>('s')));
CHECK_EQUAL("a s b", test_format(s, "a {:c} b", static_cast<signed char>('s')));
CHECK_EQUAL("a 's' b", test_format(s, "a {:?} b", static_cast<signed char>('s')));
CHECK_EQUAL("a \t b", test_format(s, "a {} b", static_cast<signed char>('\t')));
CHECK_EQUAL("a '\\t' b", test_format(s, "a {:?} b", static_cast<signed char>('\t')));
CHECK_EQUAL("a '\\n' b", test_format(s, "a {:?} b", static_cast<signed char>('\n')));
CHECK_EQUAL("a '\\r' b", test_format(s, "a {:?} b", static_cast<signed char>('\r')));
CHECK_EQUAL("a '\\\"' b", test_format(s, "a {:?} b", static_cast<signed char>('"')));
CHECK_EQUAL("a '\\'' b", test_format(s, "a {:?} b", static_cast<signed char>('\'')));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", static_cast<signed char>('\\')));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", static_cast<signed char>('\\')));
CHECK_EQUAL("a 97 b", test_format(s, "a {:d} b", static_cast<signed char>('a')));
CHECK_EQUAL("a 61 b", test_format(s, "a {:X} b", static_cast<signed char>('a')));
CHECK_EQUAL("a 61 b", test_format(s, "a {:x} b", static_cast<signed char>('a')));
CHECK_EQUAL("a 0x61 b", test_format(s, "a {:#x} b", static_cast<signed char>('a')));
}
//*************************************************************************
TEST(test_format_unsigned_char)
{
etl::string<100> s;
CHECK_EQUAL("a s b", test_format(s, "a {} b", static_cast<unsigned char>('s')));
CHECK_EQUAL("a s b", test_format(s, "a {:c} b", static_cast<unsigned char>('s')));
CHECK_EQUAL("a 's' b", test_format(s, "a {:?} b", static_cast<unsigned char>('s')));
CHECK_EQUAL("a \t b", test_format(s, "a {} b", static_cast<unsigned char>('\t')));
CHECK_EQUAL("a '\\t' b", test_format(s, "a {:?} b", static_cast<unsigned char>('\t')));
CHECK_EQUAL("a '\\n' b", test_format(s, "a {:?} b", static_cast<unsigned char>('\n')));
CHECK_EQUAL("a '\\r' b", test_format(s, "a {:?} b", static_cast<unsigned char>('\r')));
CHECK_EQUAL("a '\\\"' b", test_format(s, "a {:?} b", static_cast<unsigned char>('"')));
CHECK_EQUAL("a '\\'' b", test_format(s, "a {:?} b", static_cast<unsigned char>('\'')));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", static_cast<unsigned char>('\\')));
CHECK_EQUAL("a '\\\\' b", test_format(s, "a {:?} b", static_cast<unsigned char>('\\')));
CHECK_EQUAL("a 97 b", test_format(s, "a {:d} b", static_cast<unsigned char>('a')));
CHECK_EQUAL("a 61 b", test_format(s, "a {:X} b", static_cast<unsigned char>('a')));
CHECK_EQUAL("a 61 b", test_format(s, "a {:x} b", static_cast<unsigned char>('a')));
CHECK_EQUAL("a 0x61 b", test_format(s, "a {:#x} b", static_cast<unsigned char>('a')));
}
//*************************************************************************
TEST(test_format_limit)
{
etl::string<10> s;
CHECK_EQUAL("abcdefghij", test_format(s, "abcdefghijkl"));
CHECK_EQUAL("abcdefgh12", test_format(s, "abcdefgh{}", 123));
}
//*************************************************************************
TEST(test_format_escape)
{
etl::string<100> s;
CHECK_EQUAL("abc{def", test_format(s, "abc{{def"));
CHECK_EQUAL("}abc", test_format(s, "}}abc"));
}
//*************************************************************************
TEST(test_format_invalid)
{
etl::string<100> s;
CHECK_THROW(test_format(s, "a{b}", 1),
etl::bad_format_string_exception); // bad format index spec
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_THROW(test_format(s, "a{b"),
etl::bad_format_string_exception); // closing brace missing
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_THROW(test_format(s, "a{b}"),
etl::bad_format_string_exception); // arg missing
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_THROW(test_format(s, "a}b"),
etl::bad_format_string_exception); // bad format: only escaped
// }} allowed
// goal: rejected at compile time on C++20, error on <= C++17
CHECK_EQUAL("123", test_format(s, "{:}", 123)); // valid
CHECK_THROW(test_format(s, "{::}", 123),
etl::bad_format_string_exception); // bad format spec
CHECK_THROW(test_format(s, "{1}", 123),
etl::bad_format_string_exception); // bad index
}
//*************************************************************************
TEST(test_format_indexed)
{
etl::string<100> s;
CHECK_EQUAL("34 56", test_format(s, "{0} {1}", 34, 56));
CHECK_EQUAL("56 34", test_format(s, "{1} {0}", 34, 56));
CHECK_EQUAL("134 134", test_format(s, "{0} {0}", 134));
CHECK_EQUAL("a b c d e f g h i j k l m n", test_format(s, "{0} {1} {2} {3} {4} {5} {6} {7} {8} {9} {10} {11} {12} {13}", 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n'));
}
//*************************************************************************
TEST(test_formatted_size)
{
CHECK_EQUAL(0, etl::formatted_size(""));
CHECK_EQUAL(0, etl::formatted_size("{}", ""));
CHECK_EQUAL(5, etl::formatted_size("xyz{}", 12));
CHECK_EQUAL(3, etl::formatted_size("{}", "abc"));
}
//*************************************************************************
TEST(test_iterator)
{
etl::string<100> s;
etl::istring::iterator result = etl::format_to(s.begin(), "{0} {1}", 34, 56);
s.uninitialized_resize(static_cast<size_t>(result - s.begin()));
CHECK_EQUAL("34 56", s);
s.clear();
etl::format_to(iterator(s), "");
CHECK_EQUAL("", s);
s.clear();
etl::format_to(iterator(s), "{0} {1}", 65, 34);
CHECK_EQUAL("65 34", s);
s = "abcdefghij";
etl::format_to_n(s.begin(), 3, "xy{}", 123);
CHECK_EQUAL("xy1defghij", s);
}
//*************************************************************************
TEST(test_format_spec_fill_and_align)
{
etl::string<100> s;
CHECK_EQUAL("a 34", test_format(s, "a{:5}", 34));
CHECK_EQUAL("a34", test_format(s, "a{:1}", 34));
CHECK_EQUAL("a34", test_format(s, "a{:2}", 34));
CHECK_EQUAL(" 34", test_format(s, "{:>4}", 34));
CHECK_EQUAL(" 34 ", test_format(s, "{:^4}", 34));
CHECK_EQUAL(" 34 ", test_format(s, "{:^5}", 34));
CHECK_EQUAL(" -65 ", test_format(s, "{:^5}", -65));
CHECK_EQUAL("34 ", test_format(s, "{:<4}", 34));
CHECK_THROW(test_format(s, "a{:*5}", 34), etl::bad_format_string_exception);
CHECK_EQUAL("a*34**", test_format(s, "a{:*^5}", 34));
CHECK_EQUAL("a*34**", test_format(s, "a{:*^5}", static_cast<unsigned int>(34)));
CHECK_EQUAL("a***-341234567890****", test_format(s, "a{:*^20}", static_cast<long long int>(-341234567890)));
CHECK_EQUAL("a****341234567890****", test_format(s, "a{:*^20}", static_cast<unsigned long long int>(341234567890)));
CHECK_EQUAL(" x ", test_format(s, "{: ^20}", 'x'));
CHECK_EQUAL("x ", test_format(s, "{:20}", 'x'));
CHECK_EQUAL(" x", test_format(s, "{:>20}", 'x'));
CHECK_EQUAL("x ", test_format(s, "{:<20}", 'x'));
}
//*************************************************************************
TEST(test_format_spec_sign)
{
etl::string<100> s;
CHECK_EQUAL("34", test_format(s, "{:-}", 34));
CHECK_EQUAL("-34", test_format(s, "{:-}", -34));
CHECK_EQUAL("-34", test_format(s, "{:+}", -34));
CHECK_EQUAL("+34", test_format(s, "{:+}", 34));
CHECK_EQUAL("+0", test_format(s, "{:+}", 0));
CHECK_EQUAL("0", test_format(s, "{:-}", 0));
CHECK_EQUAL("210", test_format(s, "{:-}", 210));
CHECK_EQUAL("-210", test_format(s, "{:-}", -210));
CHECK_EQUAL(" 0", test_format(s, "{: }", 0));
CHECK_EQUAL(" 546", test_format(s, "{: }", 546));
CHECK_EQUAL("-546", test_format(s, "{: }", -546));
}
//*************************************************************************
TEST(test_format_int_presentation)
{
etl::string<100> s;
CHECK_EQUAL("134", test_format(s, "{:d}", 134));
CHECK_EQUAL("3f4", test_format(s, "{:x}", 0x3f4));
CHECK_EQUAL("123456789abcdef0", test_format(s, "{:x}", 0x123456789abcdef0ULL));
CHECK_EQUAL("0x3f4", test_format(s, "{:#x}", 0x3f4));
CHECK_EQUAL("3F4", test_format(s, "{:X}", 0x3f4));
CHECK_EQUAL("0X3F4", test_format(s, "{:#X}", 0x3f4));
CHECK_EQUAL("34", test_format(s, "{:o}", 034));
CHECK_EQUAL("034", test_format(s, "{:#o}", 034));
#if ETL_USING_CPP14
CHECK_EQUAL("1010", test_format(s, "{:b}", 0b1010));
CHECK_EQUAL("0b1010", test_format(s, "{:#b}", 0b1010));
CHECK_EQUAL("1010", test_format(s, "{:B}", 0b1010));
CHECK_EQUAL("0B1010", test_format(s, "{:#B}", 0b1010));
CHECK_EQUAL("-0B1010", test_format(s, "{:#B}", -0b1010));
#endif
CHECK_EQUAL("C", test_format(s, "{:c}", 67));
CHECK_EQUAL("00067", test_format(s, "{:05d}", 67));
CHECK_EQUAL("+00067", test_format(s, "{:+05d}", 67));
CHECK_EQUAL("+0X00EF1", test_format(s, "{:+#05X}", 0xEF1));
CHECK_THROW(test_format(s, "{:+#05.5X}", 0xEF1), etl::bad_format_string_exception);
}
}
} // namespace
#endif
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