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// Copyright 2025 Steven Le Rouzic
//
// SPDX-License-Identifier: BSD-3-Clause
#include "asl/formatting/format.hpp"
#include "asl/base/float.hpp"
#include "asl/base/numeric.hpp"
#define JKJ_STD_REPLACEMENT_NAMESPACE_DEFINED 0
#define JKJ_STATIC_DATA_SECTION_DEFINED 0
#include <dragonbox.h>
static constexpr isize_t kZeroCount = 100;
static constexpr char kZeros[kZeroCount] = {
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
};
static constexpr bool is_zero(float x)
{
return (asl::bit_cast<uint32_t>(x) & 0x7fff'ffffU) == 0;
}
static constexpr bool is_zero(double x)
{
return (asl::bit_cast<uint64_t>(x) & 0x7fff'ffff'ffff'ffffULL) == 0;
}
template<asl::is_floating_point T>
static void format_float(asl::Formatter& f, T value)
{
if (asl::is_infinity(value))
{
if (value > 0)
{
f.write("Infinity"_sv);
}
else
{
f.write("-Infinity"_sv);
}
return;
}
if (is_zero(value))
{
f.write("0"_sv);
return;
}
if (asl::is_nan(value))
{
f.write("NaN"_sv);
return;
}
auto decimal = jkj::dragonbox::to_decimal(value);
if (decimal.is_negative) { f.write("-"); }
char buffer[20];
const asl::string_view digits = asl::format_uint64(decimal.significand, buffer);
if (decimal.exponent >= 0)
{
f.write(digits);
while (decimal.exponent > 0)
{
const isize_t to_write = asl::min(static_cast<isize_t>(decimal.exponent), kZeroCount);
f.write(asl::string_view(static_cast<const char*>(kZeros), to_write));
decimal.exponent -= to_write;
}
}
else
{
if (digits.size() <= -decimal.exponent)
{
f.write("0.");
decimal.exponent = -decimal.exponent - static_cast<int>(digits.size());
while (decimal.exponent > 0)
{
const isize_t to_write = asl::min(static_cast<isize_t>(decimal.exponent), kZeroCount);
f.write(asl::string_view(static_cast<const char*>(kZeros), to_write));
decimal.exponent -= to_write;
}
f.write(digits);
}
else
{
f.write(digits.first(digits.size() + decimal.exponent));
f.write(".");
f.write(digits.last(-decimal.exponent));
}
}
}
void asl::AslFormat(Formatter& f, float value)
{
format_float(f, value);
}
void asl::AslFormat(Formatter& f, double value)
{
format_float(f, value);
}
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