38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
#include "foundation/parse.h"
|
|
|
|
#include <charconv>
|
|
|
|
namespace pp::foundation {
|
|
|
|
Result<std::uint32_t> parse_u32(std::string_view text) noexcept
|
|
{
|
|
if (text.empty()) {
|
|
return Result<std::uint32_t>::failure(
|
|
Status::invalid_argument("value must not be empty"));
|
|
}
|
|
|
|
if (text.front() == '-' || text.front() == '+') {
|
|
return Result<std::uint32_t>::failure(
|
|
Status::invalid_argument("value must be an unsigned integer without a sign"));
|
|
}
|
|
|
|
std::uint32_t value = 0;
|
|
const auto* begin = text.data();
|
|
const auto* end = text.data() + text.size();
|
|
const auto [ptr, ec] = std::from_chars(begin, end, value);
|
|
|
|
if (ec == std::errc::result_out_of_range) {
|
|
return Result<std::uint32_t>::failure(
|
|
Status::out_of_range("value is outside the uint32 range"));
|
|
}
|
|
|
|
if (ec != std::errc {} || ptr != end) {
|
|
return Result<std::uint32_t>::failure(
|
|
Status::invalid_argument("value must contain only decimal digits"));
|
|
}
|
|
|
|
return Result<std::uint32_t>::success(value);
|
|
}
|
|
|
|
}
|