JsonUtils.h

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 * CamiTK - Computer Assisted Medical Intervention ToolKit
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#include <QJsonDocument>
 
class JsonUtils {
public:
    static void printJSON(QJsonObject data, bool indented = true) {
        qDebug().noquote().nospace() << QJsonDocument(data).toJson((indented) ? QJsonDocument::Indented : QJsonDocument::Compact);
    }
 
    static QJsonObject stringToJSON(QString dataString, bool print = false) {
        QJsonParseError jsonParseError;
        QJsonDocument jsonDoc = QJsonDocument::fromJson(dataString.toUtf8(), &jsonParseError);
        if (jsonDoc.isNull()) {
            // extract the string from the error offset to the next return carriage
            QString jsonErrorData(dataString.mid(jsonParseError.offset, dataString.indexOf("\n", jsonParseError.offset) - jsonParseError.offset));
            int lineNr = dataString.left(jsonParseError.offset).count('\n');
            if (lineNr == 0) {
                qWarning().noquote().nospace() << "Error creating JSON from string \"" << dataString << "\":\n" << jsonParseError.errorString() << ":\n" << jsonErrorData << "\n" << "Please check that the input string is a valid JSON string";
            }
            else {
                QString errorLine(dataString.split('\n')[lineNr - 1]);
                qWarning().noquote().nospace() << "Error creating JSON from string \"" << dataString << "\":\n" << jsonParseError.errorString() << ":\n" << jsonErrorData << "\nOn line " << lineNr << ":\n" << errorLine;
            }
            return QJsonObject();
        }
        else if (!jsonDoc.isObject()) {
            qWarning().noquote().nospace() << "Error creating JSON from string \"" << dataString << "\":\n: JSON document is not an object";
            return QJsonObject();
        }
        else {
            QJsonObject data = jsonDoc.object();
            if (print) {
                printJSON(data);
            }
            return data;
        }
    }
};