Add JsonWriter

src/nostalgia/studio/lib/json_write.hpp

@@ -8,9 +8,66 @@
 
 #pragma once
 
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QJsonDocument>
+#include "json_err.hpp"
+#include "json_operator.hpp"
+
 namespace nostalgia {
 namespace studio {
 
+class JsonWriter {
+
+	private:
+		QJsonObject &m_dest;
+
+	public:
+		JsonWriter(QJsonObject &obj);
+
+		ox::Error op(QString fieldName, int *src);
+
+		ox::Error op(QString fieldName, bool *src);
+
+		ox::Error op(QString fieldName, double *src);
+
+		ox::Error op(QString fieldName, QString *src);
+
+		template<typename T>
+		ox::Error op(QString fieldName, T *src);
+
+		template<typename T>
+		ox::Error op(QString fieldName, QVector<T> *src);
+
+};
+
+template<typename T>
+ox::Error JsonWriter::op(QString fieldName, T *src) {
+	auto obj = QJsonObject();
+	auto reader = JsonWriter(obj);
+	auto err = ioOp(&reader, src);
+	m_dest[fieldName] = obj;
+	return err;
+};
+
+template<typename T>
+ox::Error JsonWriter::op(QString fieldName, QVector<T> *src) {
+	ox::Error err = 0;
+	auto &a = m_dest[fieldName] = QJsonArray();
+	for (int i = 0; i < src->size(); i++) {
+		err |= op(a[i], &src->at(i));
+	}
+	return err;
+};
+
+template<typename T>
+int writeJson(QString *json, T *src) {
+	auto obj = QJsonObject();
+	JsonWriter rdr(obj);
+	auto err = ioOp(&rdr, src);
+	*json = QJsonDocument(obj).toJson();
+	return err;
+}
 
 }
 }