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This commit is contained in:
Timur A. Fatkhullin 2024-01-22 00:34:49 +03:00
parent 41a9c70e70
commit fa0cfea8fe
2 changed files with 60 additions and 52 deletions
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13
common/adc_traits.h
View File

@ -3,6 +3,7 @@
#include <ranges> #include <ranges>
#include <tuple> #include <tuple>
#include <type_traits> #include <type_traits>
#include <format>
/* /*
@ -15,9 +16,17 @@
namespace adc::traits namespace adc::traits
{ {
// check if type can be used with std::format_to
// (from https://stackoverflow.com/questions/72430369/how-to-check-that-a-type-is-formattable-using-type-traits-concepts)
template<typename T>
concept formattable = requires (T& v, std::format_context ctx) {
std::formatter<std::remove_cvref_t<T>>().format(v, ctx);
};
// range of char/const char // range of char/const char
template <typename R> template <typename R, typename CharT = char>
concept adc_char_range = std::ranges::range<R> && std::is_same_v<std::remove_cv_t<std::ranges::range_value_t<R>>, char>; concept adc_char_range = std::ranges::range<R> && std::is_same_v<std::remove_cv_t<std::ranges::range_value_t<R>>, CharT>;
// deduce returned type of callable // deduce returned type of callable
template <typename T> template <typename T>

99
common/adc_utils.h
View File

@ -12,15 +12,15 @@
namespace adc::utils namespace adc::utils
{ {
bool AdcIsSpace(char in) noexcept static bool AdcIsSpace(char in) noexcept
{ {
static auto ws = {' ', '\t', '\n', '\v', '\r', '\f'}; static constexpr auto ws = {' ', '\t', '\n', '\v', '\r', '\f'};
return std::ranges::any_of(ws, [in](auto p) { return p == in; }); return std::ranges::any_of(ws, [in](auto p) { return p == in; });
}; };
template <traits::adc_char_range R> template <traits::adc_char_range R>
auto AdcTrimSpaces(R&& r) static auto AdcTrimSpaces(R&& r)
{ {
return r | std::views::drop_while(AdcIsSpace) | std::views::reverse | std::views::drop_while(AdcIsSpace) | return r | std::views::drop_while(AdcIsSpace) | std::views::reverse | std::views::drop_while(AdcIsSpace) |
std::views::reverse; std::views::reverse;
@ -28,32 +28,44 @@ auto AdcTrimSpaces(R&& r)
template <typename ValueT, traits::adc_char_range R> template <typename ValueT, traits::adc_char_range R>
ValueT AdcFromChars(R&& range) static ValueT AdcFromChars(R&& range)
{ {
if constexpr (std::is_arithmetic_v<ValueT>) { if constexpr (std::is_arithmetic_v<ValueT>) {
ValueT v; ValueT v;
auto res = std::from_chars(&*range.begin(), &*range.end(), v); std::from_chars_result res;
const char* end_ptr;
// std::from_chars needs random-access container!!!
if constexpr (std::ranges::random_access_range<R>) {
res = std::from_chars(&*range.begin(), &*range.end(), v);
end_ptr = &*range.end();
} else {
std::string s(range.begin(), range.end());
end_ptr = s.data() + s.size();
res = std::from_chars(s.data(), s.data() + s.size(), v);
}
if (res.ec == std::errc()) { if (res.ec == std::errc()) {
if (res.ptr != &*range.end()) { if (res.ptr != end_ptr) {
throw std::invalid_argument( throw std::invalid_argument(
"adc_from_chars: cannot convert char-range to user-type value (invalid argument)"); "AdcFromChars: cannot convert char-range to user-type value (invalid argument)");
} }
return v; return v;
} else if (res.ec == std::errc::invalid_argument) { } else if (res.ec == std::errc::invalid_argument) {
throw std::invalid_argument( throw std::invalid_argument(
"adc_from_chars: cannot convert char-range to user-type value (invalid argument)"); "AdcFromChars: cannot convert char-range to user-type value (invalid argument)");
} else if (res.ec == std::errc::result_out_of_range) { } else if (res.ec == std::errc::result_out_of_range) {
throw std::invalid_argument( throw std::invalid_argument(
"adc_from_chars: cannot convert char-range to user-type value (result out of range)"); "AdcFromChars: cannot convert char-range to user-type value (result out of range)");
} }
} else if (std::is_constructible_v<ValueT, std::ranges::iterator_t<R>, std::ranges::iterator_t<R>>) { } else if (std::is_constructible_v<ValueT, std::ranges::iterator_t<R>, std::ranges::iterator_t<R>>) {
return ValueT(range.begin(), range.end()); return ValueT(range.begin(), range.end());
} else { } else {
throw std::invalid_argument( static_assert(false, "AdcFromChars: CANNOT CONVERT CHAR-RANGE TO USER-TYPE VALUE (UNSUPPORTED USER-VALUE TYPE)");
"adc_from_chars: cannot convert char-range to user-type value (unsupported user-value type)"); // throw std::invalid_argument(
// "AdcFromChars: cannot convert char-range to user-type value (unsupported user-value type)");
} }
} }
@ -63,18 +75,17 @@ ValueT AdcFromChars(R&& range)
static const std::regex AdcIntegerRegex("^ *[+-]?\\d+\\d* *$", std::regex::ECMAScript); static const std::regex AdcIntegerRegex("^ *[+-]?\\d+\\d* *$", std::regex::ECMAScript);
static const std::regex AdcRealRegex("^ *[-+]?\\d+\\d*\\.?\\d*([Ee][-+]?\\d+)? *$", std::regex::ECMAScript); static const std::regex AdcRealRegex("^ *[-+]?\\d+\\d*\\.?\\d*([Ee][-+]?\\d+)? *$", std::regex::ECMAScript);
template <typename VT, typename SerializedT = std::string> template <traits::formattable VT, typename SerializedT = std::string>
static SerializedT AdcTrivialSerializer(VT&& value) static SerializedT AdcTrivialSerializer(VT&& value)
{ {
using v_t = std::decay_t<VT>; using v_t = std::decay_t<VT>;
if constexpr (std::is_convertible_v<v_t, SerializedT>) { if constexpr (std::is_convertible_v<v_t, SerializedT>) {
return static_cast<SerializedT>(std::forward<VT>(value)); return static_cast<SerializedT>(std::forward<VT>(value));
} else if (std::is_convertible_v<std::string, SerializedT>) {
return static_cast<SerializedT>(std::to_string(std::forward<VT>(value)));
} else if (traits::adc_char_range<SerializedT>) { } else if (traits::adc_char_range<SerializedT>) {
auto s = std::to_string(std::forward<VT>(value)); SerializedT s_val;
return SerializedT(s.begin(), s.end()); std::format_to(std::back_inserter(s_val), "{}", std::forward<VT>(value));
return s_val;
} else { } else {
// throw std::invalid_argument("trivial serializer: cannot serialize value"); // throw std::invalid_argument("trivial serializer: cannot serialize value");
static_assert(false, "TRIVIAL SERIALIZER: UNSUPPORTED SERIALIZING TYPE!!!"); static_assert(false, "TRIVIAL SERIALIZER: UNSUPPORTED SERIALIZING TYPE!!!");
@ -85,45 +96,33 @@ static SerializedT AdcTrivialSerializer(VT&& value)
template <typename VT, typename SerializedT = std::string> template <typename VT, typename SerializedT = std::string>
static VT AdcTrivialDeserializer(SerializedT&& s_value) static VT AdcTrivialDeserializer(SerializedT&& s_value)
{ {
static_assert(std::is_convertible_v<SerializedT, std::string> || traits::adc_char_range<SerializedT>, return AdcFromChars<VT>(std::forward<SerializedT>(s_value));
"TRIVIAL DESERIALIZER: UNSUPPORTED TYPE OF SERIALIZED VALUE!!!");
if constexpr (std::is_arithmetic_v<VT>) {
if constexpr (traits::adc_char_range<SerializedT>) {
if (std::regex_match(s_value.begin(), s_value.end(), AdcIntegerRegex)) { // integer value
return std::stoll({s_value.begin(), s_value.end()});
}
if (std::regex_match(s_value.begin(), s_value.end(), AdcRealRegex)) { // floating-point value
return std::stod({s_value.begin(), s_value.end()});
}
} else { // SerializedT may be converted to std::string
if (std::regex_match(s_value, AdcIntegerRegex)) { // integer value
return std::stoll(std::forward<SerializedT>(s_value));
}
if (std::regex_match(s_value, AdcRealRegex)) { // floating-point value
return std::stod(std::forward<SerializedT>(s_value));
}
}
throw std::invalid_argument("trivial deserializer: unsupported serialized value");
} else if (std::is_convertible_v<SerializedT, VT>) {
return static_cast<VT>(std::forward<SerializedT>(s_value));
} else if (std::is_convertible_v<std::string, VT>) { // SerializedT is char range
return static_cast<VT>(s_v(s_value.begin(), s_value.end()));
}
throw std::invalid_argument("trivial deserializer: unsupported serialized value");
} }
template <std::ranges::range OutputR, traits::adc_char_range InputR, traits::adc_char_range DelimR> template <std::ranges::range OutputR, traits::adc_char_range InputR, traits::adc_char_range DelimR>
OutputR AdcRangeFromCharRange(InputR&& input_r, DelimR&& delim_r, size_t max_len = std::numeric_limits<size_t>::max()) OutputR AdcRangeFromCharRange(InputR&& input_r, DelimR&& delim, size_t max_len = std::numeric_limits<size_t>::max())
{ {
OutputR out_r; OutputR res;
if (max_len == 0)
return res;
using value_t = std::ranges::range_value_t<OutputR>;
if constexpr (std::is_array_v<std::remove_cvref_t<DelimR>>) {
std::ranges::copy(std::views::split(std::forward<InputR>(input_r), std::string_view(delim)) |
std::views::filter([](const auto& r) { return !std::ranges::empty(r); }) |
std::views::transform([](auto vl) { return convFunc<value_t>(vl); }) | std::views::take(max_len),
std::back_inserter(res));
} else {
std::ranges::copy(std::views::split(std::forward<InputR>(input_r), std::forward<DelimR>(delim)) |
std::views::filter([](const auto& r) { return !std::ranges::empty(r); }) |
std::views::transform([](auto vl) { return convFunc<value_t>(vl); }) | std::views::take(max_len),
std::back_inserter(res));
}
return res;
} }
} // namespace adc::utils } // namespace adc::utils