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qsettings_json.hpp
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qsettings_json.hpp
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#ifndef QSETTINGS_JSON_HPP
#define QSETTINGS_JSON_HPP
#include <QtCore>
#include <QObject>
#include <QDebug>
bool readSettingsJson(QIODevice &device, QSettings::SettingsMap &map);
bool writeSettingsJson(QIODevice &device, const QSettings::SettingsMap &map);
bool parseJsonValue(const QString &jsonKey, const QJsonValue &jsonValue, QString prefix, QSettings::SettingsMap &map);
bool parseJsonArray(const QJsonArray &jsonArray, QString prefix, QSettings::SettingsMap &map);
QJsonValue restoreJsonValue (QSettings::SettingsMap &map, QStringList &keysWL, QStringList §ions, int sectionLevel, QVariant &value);
static const QSettings::Format JsonFormat = QSettings::registerFormat("JsonFormat", &readSettingsJson, &writeSettingsJson);
// -------------------- Reading -------------------------
QVariant encode(QVariant value){
if (value.isNull()) return value;
};
bool parseJsonArray(const QJsonArray &jsonArray, QString prefix, QSettings::SettingsMap &map){
int arr_ctr=0;
if (! jsonArray.isEmpty()) {
for (const QJsonValue &arrayItem: jsonArray){
QString arrItemkey = QString("#%1").arg(arr_ctr, /*fieldWidth=*/ 5, /*base=*/ 10, /*fillChar=*/ QChar('0'));
if (parseJsonValue(arrItemkey, arrayItem, prefix, map))
arr_ctr++;
}
return true;
} else
// empty array
qWarning().noquote() << "empty JsonArray" << prefix << "ignored during read, some array item numbering will possibly be changed skipped.";
return false;
};
bool parseJsonObject(QJsonObject &jsonObject, QString prefix, QSettings::SettingsMap &map)
{
QStringList keys = jsonObject.keys();
if (! keys.isEmpty()) {
for(int i=0; i<keys.size(); i++) {
QString currentKey = keys[i];
QJsonValue currentValue = jsonObject.value(currentKey);
parseJsonValue(currentKey, currentValue, prefix, map);
}
return true;
} else
// empty object
qWarning().noquote() << "empty JsonObject" << prefix << "ignored during read, some array item numbering will possibly be changed skipped.";
return false;
}
bool parseJsonValue(const QString &jsonKey, const QJsonValue &jsonValue, QString prefix, QSettings::SettingsMap &map)
{
if(jsonValue.isObject())
{
QJsonObject jsonObj = jsonValue.toObject();
return parseJsonObject(jsonObj, prefix + jsonKey + "/", map);
}
else if(jsonValue.isArray()){
QJsonArray jsonArray = jsonValue.toArray();
return parseJsonArray(jsonArray, prefix + jsonKey + "/", map);
}
else if(jsonValue.isUndefined()){
map.insert(prefix + jsonKey, QVariant(QVariant::Invalid));
}
else
{
map.insert(prefix + jsonKey, encode(jsonValue.toVariant()));
}
return true;
}
bool readSettingsJson(QIODevice &device, QSettings::SettingsMap &map)
{
// if (dynamic_cast<QFile*>(&device)){
// QFile* f = dynamic_cast<QFile*>(&device);
// qDebug() << "Filename: " << f->fileName();
// }
QJsonParseError jsonError;
QString jsonString = device.readAll();
// qWarning() << jsonString;
QJsonDocument jsonDoc = QJsonDocument::fromJson(jsonString.toUtf8(), &jsonError);
if(jsonError.error != QJsonParseError::NoError)
return false;
if (jsonDoc.isObject()) {
QJsonObject jsonObject = jsonDoc.object();
parseJsonObject(jsonObject, QString(), map);
} else {
QJsonArray jsonArray = jsonDoc.array();
parseJsonArray(jsonArray, QString(), map);
}
return true;
}
// -------------------- Writing -------------------------
QVariant decode(QVariant value){
if (value.isNull()) return value;
};
QJsonValue restoreJsonSimpleValue(QSettings::SettingsMap &map, QStringList &keysWL, QStringList §ions, QVariant &value)
{
QJsonValue jsonValue;
if (value.isNull()) {
jsonValue = QJsonValue();
} else {
jsonValue = QJsonValue::fromVariant(decode(value));
}
keysWL.removeFirst();
if (!keysWL.isEmpty()){
QString newKey = keysWL.first();
sections = newKey.split('/');
value = map[newKey];
} else {
sections = QStringList();
value = QVariant(QVariant::Invalid);
}
return jsonValue;
}
QJsonObject restoreJsonObject(QSettings::SettingsMap &map, QStringList &keysWL, QStringList §ions, int sectionLevel, QVariant &value)
{
QJsonObject jsonObject;
const QStringList path = sections.mid(0, sectionLevel);
while (! keysWL.isEmpty()) {
const QString key = sections[sectionLevel];
jsonObject.insert(key, restoreJsonValue(map, keysWL, sections, sectionLevel + 1, value));
if (keysWL.isEmpty() ||
path.size() > sections.size() ||
path != sections.mid(0, sectionLevel)
) {
break;
}
}
return jsonObject;
}
int getArrayIndex(QString section, bool *ok = nullptr) {
*ok = false;
int index = -1;
if (section.startsWith("#")) {
// check for Array
// strip # and convert to int
index = section.midRef(1).toInt(ok);
}
return index;
}
QJsonArray restoreJsonArray(QSettings::SettingsMap &map, QStringList &keysWL, QStringList §ions, int sectionLevel, QVariant &value)
{
QJsonArray jsonArray;
if (sectionLevel >= sections.size()) {
qWarning().noquote() << "Structural error.";
return jsonArray;
}
const QStringList path = sections.mid(0, sectionLevel);
while (!keysWL.isEmpty()) {
const QString arrayIndexSection = sections.at(sectionLevel);
bool conversion_result_ok = false;
getArrayIndex(arrayIndexSection, &conversion_result_ok);
if (conversion_result_ok) {
QJsonValue jsonValue = restoreJsonValue(map, keysWL, sections, sectionLevel + 1, value);
jsonArray.append(jsonValue);
if (keysWL.isEmpty() ||
path.size() >= sections.size() ||
path != sections.mid(0, sectionLevel)
) {
break;
}
} else {
qWarning().noquote() << "Array index expected, got" << arrayIndexSection << ".";
}
}
return jsonArray;
}
QJsonValue restoreJsonValue (QSettings::SettingsMap &map, QStringList &keysWL, QStringList §ions, int sectionLevel, QVariant &value) {
int section_size = sections.size();
if (section_size <= sectionLevel) {
// is last section => SimpleValue and last section is key
return restoreJsonSimpleValue(map, keysWL, sections, value);
}
// Object or Array
if (sectionLevel < sections.size()) {
const QString arrayIndexSection = sections.at(sectionLevel);
bool conversion_result_ok = false;
getArrayIndex(arrayIndexSection, &conversion_result_ok);
if (conversion_result_ok) {
// is Array
return restoreJsonArray(map, keysWL, sections, sectionLevel, value);
}
}
// Object
return restoreJsonObject(map, keysWL, sections, sectionLevel, value);
}
bool writeSettingsJson(QIODevice &device, const QSettings::SettingsMap &map)
{
QJsonValue buffer;
QMap<QString, QVariant> tmp_map = map;
QStringList keysWL = map.keys();
if (! keysWL.isEmpty()) {
QStringList sections = keysWL.first().split('/');
int sectionLevel = 0;
QVariant value = map[keysWL.first()];
buffer = restoreJsonValue(tmp_map, keysWL, sections, sectionLevel, value);;
}
if (buffer.type() == QJsonValue::Object) {
device.write(QJsonDocument(buffer.toObject()).toJson());
} else if (buffer.type() == QJsonValue::Array) {
device.write(QJsonDocument(buffer.toArray()).toJson());
} else {
device.write(QJsonDocument().toJson());
}
return true;
}
#endif // QSETTINGS_JSON_HPP