Qt-Modify-Json-Value/main.cpp at master · murattcan/Qt-Modify-Json-Value · GitHub

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#include <QCoreApplication>
#include <QDebug>

#include <QJsonDocument>
#include <QJsonArray>
#include <QJsonObject>
#include <QJsonValue>

void modifyJsonValue(QJsonValue &destValue, const QString& path, const QJsonValue& newValue);
void modifyJsonValue(QJsonDocument& doc, const QString& path, const QJsonValue& newValue);

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);
	std::string sampleJson = R"({
							 "firstName": "John",
			"lastName": "Smith",
		"age": 25,
		"address":
	{
		"streetAddress": "21 2nd Street",
		"city": "New York",
		"state": "NY",
		"postalCode": "10021"
	},
	"phoneNumber":
	[
	{
		"type": "home",
		"number": "212 555-1234"
	},
	{
		"type": "fax",
		"number": "646 555-4567"
	}
	],
	"family":
	[
	[
	"Jeff",
	"Marika",
	"Tony"
	],
	[
	"Steve",
	"Sonny",
	"Sally"
	],
	{
		"father":
		{
			"name": "Mike",
			"age": 55
		},
		"mother":
		{
			"name": "Jennifer",
			"age": 49
		}
	}
	]
})";
QJsonDocument doc = QJsonDocument::fromJson(QByteArray::fromStdString(sampleJson));
QJsonObject obj = doc.object();

modifyJsonValue(doc, "firstName", QJsonValue("Natalia"));
modifyJsonValue(doc, "age", 22);
modifyJsonValue(doc, "address.state", "None");
modifyJsonValue(doc, "phoneNumber[0].number", "333 543-3210");
modifyJsonValue(doc, "family[0][2]", "Bill");
modifyJsonValue(doc, "family[1][1]", "Winston");
modifyJsonValue(doc, "family[2].father.age", 56);

QJsonObject obj2 = doc.object();

return a.exec();
}

void modifyJsonValue(QJsonValue& destValue, const QString& path, const QJsonValue& newValue)
{
	const int indexOfDot = path.indexOf('.');
	const QString dotPropertyName = path.left(indexOfDot);
	const QString dotSubPath = indexOfDot > 0 ? path.mid(indexOfDot + 1) : QString();

	const int indexOfSquareBracketOpen = path.indexOf('[');
	const int indexOfSquareBracketClose = path.indexOf(']');

	const int arrayIndex = path.mid(indexOfSquareBracketOpen + 1, indexOfSquareBracketClose - indexOfSquareBracketOpen - 1).toInt();

	const QString squareBracketPropertyName = path.left(indexOfSquareBracketOpen);
	const QString squareBracketSubPath = indexOfSquareBracketClose > 0 ? (path.mid(indexOfSquareBracketClose + 1)[0] == '.' ? path.mid(indexOfSquareBracketClose + 2) : path.mid(indexOfSquareBracketClose + 1)) : QString();

	bool useDot = true;
	if (indexOfDot >= 0)
	{
		if (indexOfSquareBracketOpen >= 0)
		{
			if (indexOfDot > indexOfSquareBracketOpen)
				useDot = false;
			else
				useDot = true;
		}
		else
			useDot = true;
	}
	else
	{
		if (indexOfSquareBracketOpen >= 0)
			useDot = false;
		else
			useDot = true;
	}

	QString usedPropertyName = useDot ? dotPropertyName : squareBracketPropertyName;
	QString usedSubPath = useDot ? dotSubPath : squareBracketSubPath;


	QJsonValue subValue;
	if (destValue.isArray())
		subValue = destValue.toArray()[usedPropertyName.toInt()];
	else if (destValue.isObject())
		subValue = destValue.toObject()[usedPropertyName];
	else
		qDebug() << "oh, what should i do now with the following value?! " << destValue;

	if (subValue.isArray())
	{
		QJsonArray arr = subValue.toArray();
		QJsonValue arrEntry;
		if(! usedSubPath.isEmpty()) {
			arrEntry = arr[arrayIndex];
			modifyJsonValue(arrEntry,usedSubPath,newValue);
			arr[arrayIndex] = arrEntry;
		} else {
			if(arrayIndex<arr.size()) {
				arrEntry = newValue;
				arr[arrayIndex] = arrEntry;
			}
			else {
				arr.append(newValue);
			}
		}
		subValue = arr;
	} else if (subValue.isObject() && !usedSubPath.isEmpty()) {
		modifyJsonValue(subValue,usedSubPath,newValue);
	} else {
		subValue = newValue;
	}

	if (destValue.isArray())
	{
		QJsonArray arr = destValue.toArray();
		arr[arrayIndex] = subValue;
		destValue = arr;
	}
	else if (destValue.isObject())
	{
		QJsonObject obj = destValue.toObject();
		obj[usedPropertyName] = subValue;
		destValue = obj;

	}
	else
		destValue = newValue;

}

void modifyJsonValue(QJsonDocument& doc, const QString& path, const QJsonValue& newValue)
{
	QJsonValue val;
	if (doc.isArray())
		val = doc.array();
	else
		val = doc.object();

	modifyJsonValue(val,path,newValue);

	if (val.isArray())
		doc = QJsonDocument(val.toArray());
	else
		doc = QJsonDocument(val.toObject());
}