Util: Add JSON Array/Object/Value types

src/util/json/value.h

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef JSON_VALUE_H
+#define JSON_VALUE_H
+
+#include <string>
+
+namespace Json {
+
+class Array;
+class Object;
+
+class Value {
+public:
+	enum class Type {
+		Null,   // null       (case sensitive!)
+		Bool,   // true/false (case sensitive!)
+		Number, // 123
+		String, // ""
+		Array,  // []
+		Object, // {}
+	};
+
+	Value() {}
+	virtual ~Value() { clear(); }
+
+	// Copy constructor
+	Value(const Value& other);
+	// Assignment operator
+	Value& operator=(const Value& other);
+
+	Value(bool value);
+	Value(double value);
+	Value(const char* value);
+	Value(const std::string& value);
+	Value(const Array& value);
+	Value(const Object& value);
+
+	bool asBool() const { return m_value.asBool; }
+	double asDouble() const { return m_value.asDouble; }
+	const std::string& asString() const { return *m_value.asString; }
+	const Array& asArray() const { return *m_value.asArray; }
+	const Object& asObject() const { return *m_value.asObject; }
+
+private:
+	void clear();
+	void copyFrom(const Value& other);
+
+	Type m_type { Type::Null };
+
+	union {
+		bool asBool;
+		double asDouble;
+		std::string* asString;
+		Array* asArray;
+		Object* asObject;
+	} m_value;
+};
+
+} // namespace Json
+
+#endif // JSON_VALUE_H