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Update JsonNew for IReference+cleaner optionals, and better Mappers (#6890)
This commit updates JsonUtilsNew to support winrt `Windows::Foundation::IReference<T>` as an option type, and cleans up the optional support code by removing the optional overload on `GetValue(...)`. Instead of using an overload with a partial specialization, we're using a constexpr if with a type trait to determine option-type-ness. In addition, Carlos reported an issue with deriving from `FlagMapper` (itself templated) and referring to the base type's members without fully qualifying them. To make derivation easier, `EnumMapper` and `FlagMapper` now provide `BaseEnumMapper` and `BaseFlagMapper` type aliases. I've taken the opportunity to add a `winrt::hstring` conversion trait. Lastly, in casual use, I found out that I'd written the til::color converter wrong: it supports color strings of length 7 (`#rrggbb`) and length 4 (`#rgb`). I mistyped (and failed to test) support for 4-length color strings by pretending they were only 3 characters long. ## References Merged JsonUtils changes from #6004 and #6590. ## PR Checklist * [x] Unblocks aforementioned PRs * [x] cla * [x] Tests added/passed * [x] Documentation N/A * [x] Schema N/A * [x] Kid tested, mother approved.
This commit is contained in:
Dustin L. Howett
GitHub
parent
592c634577
commit
89c4ebaafe
@ -20,9 +20,15 @@ Author(s):
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namespace winrt
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{
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// If we don't use winrt, nobody will include the ConversionTrait for winrt::guid.
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// If nobody includes it, this forward declaration will suffice.
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// If we don't use winrt, nobody will include the ConversionTraits for winrt stuff.
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// If nobody includes it, these forward declarations will suffice.
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struct guid;
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struct hstring;
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namespace Windows::Foundation
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{
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template<typename T>
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struct IReference;
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}
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}
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namespace TerminalApp::JsonUtils
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@ -45,12 +51,21 @@ namespace TerminalApp::JsonUtils
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struct DeduceOptional
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{
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using Type = typename std::decay<T>::type;
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static constexpr bool IsOptional = false;
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};
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template<typename TOpt>
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struct DeduceOptional<std::optional<TOpt>>
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{
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using Type = typename std::decay<TOpt>::type;
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static constexpr bool IsOptional = true;
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};
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template<typename TOpt>
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struct DeduceOptional<::winrt::Windows::Foundation::IReference<TOpt>>
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{
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using Type = typename std::decay<TOpt>::type;
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static constexpr bool IsOptional = true;
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};
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}
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@ -105,7 +120,9 @@ namespace TerminalApp::JsonUtils
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template<typename T>
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struct ConversionTrait
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{
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// FromJson, CanConvert are not defined so as to cause a compile error (which forces a specialization)
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// Forward-declare these so the linker can pick up specializations from elsewhere!
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T FromJson(const Json::Value&);
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bool CanConvert(const Json::Value& json);
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};
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template<>
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@ -136,6 +153,18 @@ namespace TerminalApp::JsonUtils
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}
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};
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#ifdef WINRT_BASE_H
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template<>
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struct ConversionTrait<winrt::hstring> : public ConversionTrait<std::wstring>
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{
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// Leverage the wstring converter's validation
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winrt::hstring FromJson(const Json::Value& json)
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{
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return winrt::hstring{ til::u8u16(Detail::GetStringView(json)) };
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}
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};
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#endif
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template<>
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struct ConversionTrait<bool>
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{
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@ -248,13 +277,14 @@ namespace TerminalApp::JsonUtils
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}
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const auto string{ Detail::GetStringView(json) };
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return (string.length() == 7 || string.length() == 3) && string.front() == '#';
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return (string.length() == 7 || string.length() == 4) && string.front() == '#';
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}
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};
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template<typename T, typename TBase>
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struct EnumMapper
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{
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using BaseEnumMapper = EnumMapper<T, TBase>;
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using pair_type = std::pair<std::string_view, T>;
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T FromJson(const Json::Value& json)
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{
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@ -284,6 +314,13 @@ namespace TerminalApp::JsonUtils
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template<typename T, typename TBase>
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struct FlagMapper : public EnumMapper<T, TBase>
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{
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private:
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// Hide BaseEnumMapper so FlagMapper's consumers cannot see
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// it.
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using BaseEnumMapper = EnumMapper<T, TBase>::BaseEnumMapper;
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public:
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using BaseFlagMapper = FlagMapper<T, TBase>;
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static constexpr T AllSet{ static_cast<T>(~0u) };
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static constexpr T AllClear{ static_cast<T>(0u) };
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@ -291,7 +328,7 @@ namespace TerminalApp::JsonUtils
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{
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if (json.isString())
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{
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return EnumMapper::FromJson(json);
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return BaseEnumMapper::FromJson(json);
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}
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else if (json.isArray())
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{
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@ -299,7 +336,7 @@ namespace TerminalApp::JsonUtils
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T value{};
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for (const auto& element : json)
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{
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const auto newFlag{ EnumMapper::FromJson(element) };
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const auto newFlag{ BaseEnumMapper::FromJson(element) };
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if (++seen > 1 &&
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((newFlag == AllClear && value != AllClear) ||
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(value == AllClear && newFlag != AllClear)))
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@ -318,7 +355,7 @@ namespace TerminalApp::JsonUtils
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bool CanConvert(const Json::Value& json)
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{
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return EnumMapper::CanConvert(json) || json.isArray();
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return BaseEnumMapper::CanConvert(json) || json.isArray();
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}
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};
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@ -334,6 +371,18 @@ namespace TerminalApp::JsonUtils
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template<typename T, typename Converter>
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bool GetValue(const Json::Value& json, T& target, Converter&& conv)
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{
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if constexpr (Detail::DeduceOptional<T>::IsOptional)
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{
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// FOR OPTION TYPES
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// - If the json object is set to `null`, then
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// we'll instead set the target back to the empty optional.
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if (json.isNull())
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{
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target = T{}; // zero-construct an empty optional
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return true;
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}
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}
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if (json)
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{
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if (!conv.CanConvert(json))
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@ -347,36 +396,6 @@ namespace TerminalApp::JsonUtils
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return false;
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}
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// Method Description:
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// - Overload on GetValue that will populate a std::optional with a value converted from json
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// - If the json value doesn't exist we'll leave the target object unmodified.
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// - If the json object is set to `null`, then
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// we'll instead set the target back to nullopt.
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// Arguments:
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// - json: the json object to convert
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// - target: the value to populate with the converted result
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// Return Value:
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// - a boolean indicating whether the optional was changed
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//
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// GetValue, type-deduced for optional, manual converter
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template<typename TOpt, typename Converter>
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bool GetValue(const Json::Value& json, std::optional<TOpt>& target, Converter&& conv)
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{
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if (json.isNull())
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{
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target = std::nullopt;
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return true; // null is valid for optionals
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}
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std::decay_t<TOpt> local{};
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if (GetValue(json, local, std::forward<Converter>(conv)))
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{
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target = std::move(local);
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return true;
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}
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return false;
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}
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// GetValue, forced return type, manual converter
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template<typename T, typename Converter>
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std::decay_t<T> GetValue(const Json::Value& json, Converter&& conv)
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