yyc12345
67bd445885
- update the implementation of ParserHelper from locale-based std::to_string, std::stod, std::stoull, to locale-independent function std::from_chars and std::to_chars. - rename TerminalHelper to ConsoleHelper.
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
#pragma once
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#include "YYCCInternal.hpp"
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#include "EncodingHelper.hpp"
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#include <string>
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#include <cinttypes>
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#include <type_traits>
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#include <stdexcept>
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#include <charconv>
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#include <array>
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namespace YYCC::ParserHelper {
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// Reference: https://zh.cppreference.com/w/cpp/utility/from_chars
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template<typename _Ty, std::enable_if_t<std::is_floating_point_v<_Ty>, int> = 0>
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bool TryParse(const std::string& strl, _Ty& num) {
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auto [ptr, ec] = std::from_chars(strl.c_str(), strl.c_str() + strl.size(), num, std::chars_format::general);
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if (ec == std::errc()) {
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// check whether the full string is matched
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return ptr == strl.c_str() + strl.size();
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} else if (ec == std::errc::invalid_argument) {
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// given string is invalid
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return false;
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} else if (ec == std::errc::result_out_of_range) {
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// given string is out of range
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return false;
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} else {
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// unreachable
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throw std::runtime_error("unreachable code.");
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}
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}
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template<typename _Ty, std::enable_if_t<std::is_integral_v<_Ty> && !std::is_same_v<_Ty, bool>, int> = 0>
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bool TryParse(const std::string& strl, _Ty& num, int base = 10) {
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auto [ptr, ec] = std::from_chars(strl.c_str(), strl.c_str() + strl.size(), num, base);
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if (ec == std::errc()) {
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// check whether the full string is matched
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return ptr == strl.c_str() + strl.size();
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} else if (ec == std::errc::invalid_argument) {
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// given string is invalid
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return false;
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} else if (ec == std::errc::result_out_of_range) {
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// given string is out of range
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return false;
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} else {
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// unreachable
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throw std::runtime_error("unreachable code.");
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}
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}
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template<typename _Ty, std::enable_if_t<std::is_same_v<_Ty, bool>, int> = 0>
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bool TryParse(const std::string& strl, _Ty& num) {
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if (strl == "true") num = true;
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else if (strl == "false") num = false;
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else return false;
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return true;
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}
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template<typename _Ty, std::enable_if_t<std::is_arithmetic_v<_Ty>, int> = 0>
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_Ty Parse(const std::string& strl) {
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_Ty ret;
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TryParse(strl, ret);
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return ret;
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}
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// Reference: https://en.cppreference.com/w/cpp/utility/to_chars
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template<typename _Ty, std::enable_if_t<std::is_arithmetic_v<_Ty> && !std::is_same_v<_Ty, bool>, int> = 0>
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std::string ToString(_Ty num) {
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std::array<char, 64> buffer;
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auto [ptr, ec] = std::to_chars(buffer.data(), buffer.data() + buffer.size(), num);
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if (ec == std::errc()) {
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return std::string(buffer.data(), ptr - buffer.data());
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} else if (ec == std::errc::value_too_large) {
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// too short buffer
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// this should not happend
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throw std::out_of_range("ToString() buffer is not sufficient.");
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} else {
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// unreachable
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throw std::runtime_error("unreachable code.");
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}
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}
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template<typename _Ty, std::enable_if_t<std::is_same_v<_Ty, bool>, int> = 0>
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std::string ToString(_Ty num) {
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if (num) return std::string("true");
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else return std::string("false");
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}
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}
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