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// Copyright 2025 Steven Le Rouzic
//
// SPDX-License-Identifier: BSD-3-Clause
#include "asl/strings/parse_number.hpp"
namespace asl
{
bool parse_float_impl(const char** begin, const char* end, float*);
bool parse_double_impl(const char** begin, const char* end, double*);
} // namespace asl
asl::status_or<asl::parse_number_result<float>> asl::parse_float(asl::string_view sv)
{
const auto* begin = sv.data();
// NOLINTNEXTLINE(*-pointer-arithmetic)
const auto* end = begin + sv.size();
if (float value{}; parse_float_impl(&begin, end, &value))
{
return parse_number_result<float>{
.value = value,
.remaining = string_view{begin, end},
};
}
return invalid_argument_error();
}
asl::status_or<asl::parse_number_result<double>> asl::parse_double(asl::string_view sv)
{
const auto* begin = sv.data();
// NOLINTNEXTLINE(*-pointer-arithmetic)
const auto* end = begin + sv.size();
if (float value{}; parse_float_impl(&begin, end, &value))
{
return parse_number_result<double>{
.value = value,
.remaining = string_view{begin, end},
};
}
return invalid_argument_error();
}
namespace
{
constexpr int8_t kBase16Table[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
// @Todo Maybe monomorph this for common bases (2, 16, 10)?
template<typename T>
asl::status_or<asl::parse_number_result<T>> parse_integer(asl::string_view sv, int base)
{
ASL_ASSERT(base >= 2 && base <= 16);
if (sv.is_empty()) { return asl::invalid_argument_error(); }
T value = 0;
bool is_negative = false;
if (asl::is_signed_integer<T> && sv[0] == '-')
{
is_negative = true;
sv = sv.substr(1);
}
isize_t cursor = 0;
while (cursor < sv.size())
{
// NOLINTNEXTLINE(*-array-index)
int8_t digit = kBase16Table[static_cast<uint8_t>(sv[cursor])];
if (digit < 0 || digit >= base) { break; }
if (__builtin_mul_overflow(value, static_cast<T>(base), &value))
{
return asl::invalid_argument_error("overflow");
}
if (asl::is_signed_integer<T> && is_negative)
{
digit = static_cast<T>(-digit);
}
if (__builtin_add_overflow(value, static_cast<T>(digit), &value))
{
return asl::invalid_argument_error("overflow");
}
cursor += 1;
}
if (cursor == 0)
{
return asl::invalid_argument_error();
}
return asl::parse_number_result<T>{
.value = value,
.remaining = sv.substr(cursor),
};
}
} // anonymous namespace
asl::status_or<asl::parse_number_result<uint8_t>> asl::parse_uint8(string_view sv, int base)
{
return parse_integer<uint8_t>(sv, base);
}
asl::status_or<asl::parse_number_result<uint16_t>> asl::parse_uint16(string_view sv, int base)
{
return parse_integer<uint16_t>(sv, base);
}
asl::status_or<asl::parse_number_result<uint32_t>> asl::parse_uint32(string_view sv, int base)
{
return parse_integer<uint32_t>(sv, base);
}
asl::status_or<asl::parse_number_result<uint64_t>> asl::parse_uint64(string_view sv, int base)
{
return parse_integer<uint64_t>(sv, base);
}
asl::status_or<asl::parse_number_result<int8_t>> asl::parse_int8(string_view sv, int base)
{
return parse_integer<int8_t>(sv, base);
}
asl::status_or<asl::parse_number_result<int16_t>> asl::parse_int16(string_view sv, int base)
{
return parse_integer<int16_t>(sv, base);
}
asl::status_or<asl::parse_number_result<int32_t>> asl::parse_int32(string_view sv, int base)
{
return parse_integer<int32_t>(sv, base);
}
asl::status_or<asl::parse_number_result<int64_t>> asl::parse_int64(string_view sv, int base)
{
return parse_integer<int64_t>(sv, base);
}
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