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Qt Json to XML - Pastebin.com
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- class JsonToXml{
- static int guessPrecision(double val){
- double junk;
- int precision = 0;
- for(;!qFuzzyIsNull(std::modf(val,&junk));++precision)
- val*=10.0;
- return precision;
- }
- static void jsonValueToXml(const QJsonValue& val, const QString& name, QXmlStreamWriter& writer){
- if(val.isNull() || val.isUndefined())
- return;
- if(val.isObject())
- return jsonObjectToXml(val.toObject(),name,writer);
- if(val.isArray())
- return jsonArrayToXml(val.toArray(),name,writer);
- writer.writeStartElement(name);
- writer.writeAttribute(QStringLiteral("type"),QStringLiteral("value"));
- if(val.isBool()){
- writer.writeAttribute(QStringLiteral("valueType"),QStringLiteral("boolean"));
- writer.writeCharacters(val.toBool() ? QStringLiteral("true") : QStringLiteral("false"));
- }
- else if(val.isDouble()){
- writer.writeAttribute(QStringLiteral("valueType"),QStringLiteral("double"));
- const double doubleVal = val.toDouble();
- writer.writeCharacters(QString::number(doubleVal,'f',guessPrecision(doubleVal)));
- }
- else{
- writer.writeAttribute(QStringLiteral("valueType"),QStringLiteral("string"));
- writer.writeCharacters(val.toString());
- }
- writer.writeEndElement();
- }
- static void jsonObjectToXml(const QJsonObject& obj, const QString& name, QXmlStreamWriter& writer ){
- if(obj.isEmpty())
- return;
- writer.writeStartElement(name);
- writer.writeAttribute(QStringLiteral("type"),QStringLiteral("object"));
- for(auto i=obj.constBegin(), objEnd = obj.constEnd();i!=objEnd;++i)
- jsonValueToXml(*i,i.key(),writer);
- writer.writeEndElement();
- }
- static void jsonArrayToXml(const QJsonArray& arr, const QString& name, QXmlStreamWriter& writer ){
- writer.writeStartElement(name);
- writer.writeAttribute(QStringLiteral("type"),QStringLiteral("array"));
- for(int i=0, arrSize= arr.size();i<arrSize;++i)
- jsonValueToXml(arr.at(i),name + QString::number(i),writer);
- writer.writeEndElement();
- }
- public:
- static QString jsonToXml(const QJsonDocument& doc, const QString& rootElementName = "root"){
- QString result;
- if(doc.isEmpty() || doc.isNull())
- return result;
- QXmlStreamWriter writer(&result);
- writer.writeStartDocument();
- if(doc.isArray())
- jsonArrayToXml(doc.array(),rootElementName,writer);
- else if(doc.isObject())
- jsonObjectToXml(doc.object(),rootElementName,writer);
- return result;
- }
- };
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