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implement float parsing to numFromString

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This commit is contained in:
altalk23 2024-02-18 17:04:19 +03:00
parent d0ed9844be
commit 6d91804c57
1 changed files with 24 additions and 7 deletions
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31
loader/include/Geode/utils/general.hpp
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@ -11,6 +11,7 @@
#include <ghc/fs_fwd.hpp>
#include <matjson.hpp>
#include <charconv>
#include <clocale>
// for some reason std::filesystem::path doesn't have std::hash defined in C++17
// and ghc seems to have inherited this limitation
@ -104,13 +105,29 @@ namespace geode {
*/
template <class Num>
Result<Num> numFromString(std::string_view const str, int base = 10) {
Num result;
auto [_, ec] = std::from_chars(str.data(), str.data() + str.size(), result, base);
switch (ec) {
case std::errc(): return Ok(result);
case std::errc::invalid_argument: return Err("String is not a number");
case std::errc::result_out_of_range: return Err("Number is too large to fit");
default: return Err("Unknown error");
if constexpr (std::is_floating_point_v<Num>) {
Num val = {};
char* strEnd;
errno = 0;
if (std::setlocale(LC_NUMERIC, "en_US.utf8")) {
if constexpr (std::is_same_v<Num, float>) val = std::strtof(str.data(), &strEnd);
else if constexpr (std::is_same_v<Num, double>) val = std::strtod(str.data(), &strEnd);
else if constexpr (std::is_same_v<Num, long double>) val = std::strtold(str.data(), &strEnd);
if (errno == ERANGE) return Err("Number is too large to fit");
else if (strEnd == str.data()) return Err("String is not a number");
else return Ok(val);
}
else return Err("Failed to set locale");
}
else {
Num result;
auto [_, ec] = std::from_chars(str.data(), str.data() + str.size(), result, base);
switch (ec) {
case std::errc(): return Ok(result);
case std::errc::invalid_argument: return Err("String is not a number");
case std::errc::result_out_of_range: return Err("Number is too large to fit");
default: return Err("Unknown error");
}
}
}