src/FactSystem/FactGroup.cc

@@ -37,7 +37,8 @@ FactGroup::FactGroup(int updateRateMsecs, QObject* parent)
 
 void FactGroup::_loadFromJsonArray(const QJsonArray jsonArray)
 {
-    _nameToFactMetaDataMap = FactMetaData::createMapFromJsonArray(jsonArray, this);
+    QMap<QString, QString> defineMap;
+    _nameToFactMetaDataMap = FactMetaData::createMapFromJsonArray(jsonArray, defineMap, this);
 }
 
 void FactGroup::_setupTimer()

src/FactSystem/FactMetaData.cc

@@ -35,6 +35,9 @@ const qreal FactMetaData::UnitConsts_s::inchesToCentimeters =   2.54;
 static const char* kDefaultCategory = QT_TRANSLATE_NOOP("FactMetaData", "Other");
 static const char* kDefaultGroup    = QT_TRANSLATE_NOOP("FactMetaData", "Misc");
 
+const char* FactMetaData::_jsonMetaDataDefinesName =    "QGC.MetaData.Defines";
+const char* FactMetaData::_jsonMetaDataFactsName =      "QGC.MetaData.Facts";
+
 // Built in translations for all Facts
 const FactMetaData::BuiltInTranslation_s FactMetaData::_rgBuiltInTranslations[] = {
     { "centi-degrees",  "deg",  FactMetaData::_centiDegreesToDegrees,                   FactMetaData::_degreesToCentiDegrees },
@@ -1057,7 +1060,7 @@ int FactMetaData::decimalPlaces(void) const
     return actualDecimalPlaces;
 }
 
-FactMetaData* FactMetaData::createFromJsonObject(const QJsonObject& json, QObject* metaDataParent)
+FactMetaData* FactMetaData::createFromJsonObject(const QJsonObject& json, QMap<QString, QString>& defineMap, QObject* metaDataParent)
 {
     QString         errorString;
 
@@ -1098,7 +1101,7 @@ FactMetaData* FactMetaData::createFromJsonObject(const QJsonObject& json, QObjec
     metaData->_name = json[_nameJsonKey].toString();
 
     QStringList enumValues, enumStrings;
-    if (JsonHelper::parseEnum(json, enumStrings, enumValues, errorString, metaData->name())) {
+    if (JsonHelper::parseEnum(json, defineMap, enumStrings, enumValues, errorString, metaData->name())) {
         for (int i=0; i<enumValues.count(); i++) {
             QVariant    enumVariant;
             QString     errorString;
@@ -1204,6 +1207,14 @@ FactMetaData* FactMetaData::createFromJsonObject(const QJsonObject& json, QObjec
     return metaData;
 }
 
+void FactMetaData::_loadJsonDefines(const QJsonObject& jsonDefinesObject, QMap<QString, QString>& defineMap)
+{
+    for (const QString& defineName: jsonDefinesObject.keys()) {
+        QString mapKey = _jsonMetaDataDefinesName + QString(".") + defineName;
+        defineMap[mapKey] = jsonDefinesObject[defineName].toString();
+    }
+}
+
 QMap<QString, FactMetaData*> FactMetaData::createMapFromJsonFile(const QString& jsonFilename, QObject* metaDataParent)
 {
     QMap<QString, FactMetaData*> metaDataMap;
@@ -1223,16 +1234,34 @@ QMap<QString, FactMetaData*> FactMetaData::createMapFromJsonFile(const QString&
         return metaDataMap;
     }
 
-    if (!doc.isArray()) {
-        qWarning() << "json document is not array";
+    QJsonArray factArray;
+    QMap<QString /* define name */, QString /* define value */> defineMap;
+
+    if (doc.isObject()) {
+        // Check for Defines/Facts format
+        QString errorString;
+        QList<JsonHelper::KeyValidateInfo> keyInfoList = {
+            { FactMetaData::_jsonMetaDataDefinesName,   QJsonValue::Object, true },
+            { FactMetaData::_jsonMetaDataFactsName,     QJsonValue::Array, true },
+        };
+        if (!JsonHelper::validateKeys(doc.object(), keyInfoList, errorString)) {
+            qWarning() << "Json document incorrect format:" << errorString;
+            return metaDataMap;
+        }
+
+        _loadJsonDefines(doc.object()[FactMetaData::_jsonMetaDataDefinesName].toObject(), defineMap);
+        factArray = doc.object()[FactMetaData::_jsonMetaDataFactsName].toArray();
+    } else if (doc.isArray()) {
+        factArray = doc.array();
+    } else {
+        qWarning() << "Json document is neither array nor object";
         return metaDataMap;
     }
 
-    QJsonArray jsonArray = doc.array();
-    return createMapFromJsonArray(jsonArray, metaDataParent);
+    return createMapFromJsonArray(factArray, defineMap, metaDataParent);
 }
 
-QMap<QString, FactMetaData*> FactMetaData::createMapFromJsonArray(const QJsonArray jsonArray, QObject* metaDataParent)
+QMap<QString, FactMetaData*> FactMetaData::createMapFromJsonArray(const QJsonArray jsonArray, QMap<QString, QString>& defineMap, QObject* metaDataParent)
 {
     QMap<QString, FactMetaData*> metaDataMap;
     for (int i=0; i<jsonArray.count(); i++) {
@@ -1242,7 +1271,7 @@ QMap<QString, FactMetaData*> FactMetaData::createMapFromJsonArray(const QJsonArr
             continue;
         }
         QJsonObject jsonObject = jsonValue.toObject();
-        FactMetaData* metaData = createFromJsonObject(jsonObject, metaDataParent);
+        FactMetaData* metaData = createFromJsonObject(jsonObject, defineMap, metaDataParent);
         if (metaDataMap.contains(metaData->name())) {
             qWarning() << QStringLiteral("Duplicate fact name:") << metaData->name();
             delete metaData;

src/FactSystem/FactMetaData.h

@@ -54,9 +54,9 @@ public:
     FactMetaData(const FactMetaData& other, QObject* parent = nullptr);
 
     static QMap<QString, FactMetaData*> createMapFromJsonFile(const QString& jsonFilename, QObject* metaDataParent);
-    static QMap<QString, FactMetaData*> createMapFromJsonArray(const QJsonArray jsonArray, QObject* metaDataParent);
+    static QMap<QString, FactMetaData*> createMapFromJsonArray(const QJsonArray jsonArray, QMap<QString, QString>& defineMap, QObject* metaDataParent);
 
-    static FactMetaData* createFromJsonObject(const QJsonObject& json, QObject* metaDataParent);
+    static FactMetaData* createFromJsonObject(const QJsonObject& json, QMap<QString, QString>& defineMap, QObject* metaDataParent);
 
     const FactMetaData& operator=(const FactMetaData& other);
 
@@ -229,6 +229,8 @@ private:
     static const AppSettingsTranslation_s* _findAppSettingsDistanceUnitsTranslation(const QString& rawUnits);
     static const AppSettingsTranslation_s* _findAppSettingsAreaUnitsTranslation(const QString& rawUnits);
 
+    static void _loadJsonDefines(const QJsonObject& jsonDefinesObject, QMap<QString, QString>& defineMap);
+
     ValueType_t     _type;                  // must be first for correct constructor init
     int             _decimalPlaces;
     QVariant        _rawDefaultValue;
@@ -292,6 +294,9 @@ private:
     static const char* _incrementJsonKey;
     static const char* _hasControlJsonKey;
     static const char* _qgcRebootRequiredJsonKey;
+
+    static const char* _jsonMetaDataDefinesName;
+    static const char* _jsonMetaDataFactsName;
 };
 
 #endif

src/JsonHelper.cc

@@ -152,7 +152,7 @@ bool JsonHelper::validateKeyTypes(const QJsonObject& jsonObject, const QStringLi
     return true;
 }
 
-bool JsonHelper::parseEnum(const QJsonObject& jsonObject, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName)
+bool JsonHelper::_parseEnumWorker(const QJsonObject& jsonObject, QMap<QString, QString>& defineMap, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName)
 {
     if(jsonObject.value(_enumStringsJsonKey).isArray()) {
         // "enumStrings": ["Auto" , "Manual", "Shutter Priority", "Aperture Priority"],
@@ -162,7 +162,8 @@ bool JsonHelper::parseEnum(const QJsonObject& jsonObject, QStringList& enumStrin
         }
     } else {
         // "enumStrings": "Auto,Manual,Shutter Priority,Aperture Priority",
-        enumStrings = jsonObject.value(_enumStringsJsonKey).toString().split(",", QString::SkipEmptyParts);
+        QString value = jsonObject.value(_enumStringsJsonKey).toString();
+        enumStrings = defineMap.value(value, value).split(",", QString::SkipEmptyParts);
     }
 
     if(jsonObject.value(_enumValuesJsonKey).isArray()) {
@@ -177,7 +178,8 @@ bool JsonHelper::parseEnum(const QJsonObject& jsonObject, QStringList& enumStrin
         }
     } else {
         // "enumValues": "0,1,2,3,4,5",
-        enumValues = jsonObject.value(_enumValuesJsonKey).toString().split(",", QString::SkipEmptyParts);
+        QString value = jsonObject.value(_enumValuesJsonKey).toString();
+        enumValues = defineMap.value(value, value).split(",", QString::SkipEmptyParts);
     }
 
     if (enumStrings.count() != enumValues.count()) {
@@ -188,6 +190,17 @@ bool JsonHelper::parseEnum(const QJsonObject& jsonObject, QStringList& enumStrin
     return true;
 }
 
+bool JsonHelper::parseEnum(const QJsonObject& jsonObject, QMap<QString, QString>& defineMap, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName)
+{
+    return _parseEnumWorker(jsonObject, defineMap, enumStrings, enumValues, errorString, valueName);
+}
+
+bool JsonHelper::parseEnum(const QJsonObject& jsonObject, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName)
+{
+    QMap<QString, QString> defineMap;
+    return _parseEnumWorker(jsonObject, defineMap, enumStrings, enumValues, errorString, valueName);
+}
+
 bool JsonHelper::isJsonFile(const QByteArray& bytes, QJsonDocument& jsonDoc, QString& errorString)
 {
     QJsonParseError parseError;

src/JsonHelper.h

@@ -122,6 +122,7 @@ public:
                             QJsonArray&         polygonArray);  ///< Array to save into
 
     static bool parseEnum(const QJsonObject& jsonObject, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName = QString());
+    static bool parseEnum(const QJsonObject& jsonObject, QMap<QString, QString>& defineMap, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName = QString());
 
     /// Returns NaN if the value is null, or if not, the double value
     static double possibleNaNJsonValue(const QJsonValue& value);
@@ -142,6 +143,7 @@ private:
                                    bool                     writeAltitude,
                                    QJsonValue&              jsonValue,
                                    bool                     geoJsonFormat);
+    static bool _parseEnumWorker(const QJsonObject& jsonObject, QMap<QString, QString>& defineMap, QStringList& enumStrings, QStringList& enumValues, QString& errorString, QString valueName);
 
     static const char*  _enumStringsJsonKey;
     static const char*  _enumValuesJsonKey;