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#ifndef ENUM_INL_H_
#error "Direct inclusion of this file is not allowed, include enum.h"
// For the sake of sane code completion.
#include "enum.h"
#endif
#include "format.h"
#include <library/cpp/yt/exception/exception.h>
#include <util/string/printf.h>
#include <util/string/strip.h>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
namespace NDetail {
[[noreturn]]
void ThrowMalformedEnumValueException(
TStringBuf typeName,
TStringBuf value);
void FormatUnknownEnumValue(
TStringBuilderBase* builder,
TStringBuf name,
i64 value);
} // namespace NDetail
template <class T>
std::optional<T> TryParseEnum(TStringBuf value)
{
auto tryFromString = [] (TStringBuf value) -> std::optional<T> {
if (auto decodedValue = TryDecodeEnumValue(value)) {
auto enumValue = TEnumTraits<T>::FindValueByLiteral(*decodedValue);
return enumValue ? enumValue : TEnumTraits<T>::FindValueByLiteral(value);
}
auto reportError = [value] () {
throw TSimpleException(Format("Enum value %Qv is neither in a proper underscore case nor in a format \"%v(123)\"",
value,
TEnumTraits<T>::GetTypeName()));
};
TStringBuf typeName;
auto isTypeNameCorrect = value.NextTok('(', typeName) && typeName == TEnumTraits<T>::GetTypeName();
if (!isTypeNameCorrect) {
reportError();
}
TStringBuf enumValue;
std::underlying_type_t<T> underlyingValue = 0;
auto isEnumValueCorrect = value.NextTok(')', enumValue) && TryFromString(enumValue, underlyingValue);
if (!isEnumValueCorrect) {
reportError();
}
auto isParsingComplete = value.empty();
if (!isParsingComplete) {
reportError();
}
return static_cast<T>(underlyingValue);
};
if constexpr (TEnumTraits<T>::IsBitEnum) {
T result{};
TStringBuf token;
while (value.NextTok('|', token)) {
if (auto scalar = tryFromString(StripString(token))) {
result |= *scalar;
} else {
return {};
}
}
return result;
} else {
return tryFromString(value);
}
}
template <class T>
T ParseEnum(TStringBuf value)
{
if (auto optionalResult = TryParseEnum<T>(value)) {
return *optionalResult;
}
if constexpr (TEnumHasDefaultValue<T>::value) {
return GetDefaultValue(T{});
}
NYT::NDetail::ThrowMalformedEnumValueException(TEnumTraits<T>::GetTypeName(), value);
}
template <class T>
void FormatEnum(TStringBuilderBase* builder, T value, bool lowerCase)
{
auto formatScalarValue = [builder, lowerCase] (T value) {
auto optionalLiteral = TEnumTraits<T>::FindLiteralByValue(value);
if (!optionalLiteral) {
NYT::NDetail::FormatUnknownEnumValue(
builder,
TEnumTraits<T>::GetTypeName(),
ToUnderlying(value));
return;
}
if (lowerCase) {
CamelCaseToUnderscoreCase(builder, *optionalLiteral);
} else {
builder->AppendString(*optionalLiteral);
}
};
if constexpr (TEnumTraits<T>::IsBitEnum) {
if (TEnumTraits<T>::FindLiteralByValue(value)) {
formatScalarValue(value);
return;
}
auto first = true;
for (auto scalarValue : TEnumTraits<T>::GetDomainValues()) {
if (Any(value & scalarValue)) {
if (!first) {
builder->AppendString(TStringBuf(" | "));
}
first = false;
formatScalarValue(scalarValue);
}
}
} else {
formatScalarValue(value);
}
}
template <class T>
TString FormatEnum(T value)
{
TStringBuilder builder;
FormatEnum(&builder, value, /*lowerCase*/ true);
return builder.Flush();
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
|
