1 files changed, 99 insertions, 0 deletions
diff --git a/dev/sci/xpcom_core.h b/dev/sci/xpcom_core.h
new file mode 100644
index 00000000..c86210b5
--- /dev/null
+++ b/dev/sci/xpcom_core.h
@@ -0,0 +1,99 @@
+/* -------------------------------------------
+
+Copyright ZKA Web Services Co.
+
+File: rt.internal.inl
+Purpose: Base code of XPCOM.
+
+------------------------------------------- */
+
+/// @internal Reserved for internal definitions only.
+
+#ifndef __NDK__
+#define object	 class
+#define protocol class
+#define clsid(X)
+
+#warning ! You may be using the clang compiler, please be cautious that some features mayn't be present. !
+#endif // !__NDK__
+
+protocol IUnknown; // Refrenced from an IDB entry.
+protocol ICLSID;   // From the IDB, the constructor of the object, e.g: TextUCLSID.
+object	 UUID;
+object	 IStr;
+
+/// @brief Unknown XPCOM interface
+protocol clsid("d7c144b6-0792-44b8-b06b-02b227b547df") IUnknown
+{
+public:
+	explicit IUnknown() = default;
+	virtual ~IUnknown() = default;
+
+	IUnknown& operator=(const IUnknown&) = default;
+	IUnknown(const IUnknown&)			 = default;
+
+	virtual SInt32	  Release()					= 0;
+	virtual Void	  RemoveRef()				= 0;
+	virtual IUnknown* AddRef()					= 0;
+	virtual VoidPtr	  QueryClass(UUID * p_uuid) = 0;
+};
+
+/// @brief Allocate new XPCOM object.
+/// @tparam TCLS the class type.
+/// @tparam UCLSID UCLS factory class type.
+/// @param uclsidOfCls UCLS factory class
+/// @return TCLS interface
+template <typename TCLS, typename UCLSID, typename... Args>
+inline TCLS* XPCOMQueryInterface(UCLSID* uclsidOfCls, Args&&... args)
+{
+	if (uclsidOfCls == nullptr)
+		return nullptr;
+
+	uclsidOfCls->AddRef();
+	return uclsidOfCls->QueryInterfaceWithArgs(args...);
+}
+
+/// @brief Release XPCOM object.
+/// @tparam TCLS the class type.
+/// @param cls the class to release.
+/// @return status code.
+template <typename TCLS>
+inline SInt32 XPCOMReleaseClass(TCLS** cls)
+{
+	if (!*cls)
+		return -kErrorInvalidData;
+
+	(*cls)->RemoveRef();
+	(*cls)->Release();
+
+	*cls = nullptr;
+
+	return kErrorSuccess;
+}
+
+/// @brief Event listener interface.
+/// @tparam FnSign the event listener function type.
+/// @tparam ClsID the event listener class ID.
+template <typename FnSign, typename ClsID>
+protocol IEventListener : public ClsID
+{
+	friend ClsID;
+
+	explicit IEventListener() = default;
+	virtual ~IEventListener() = default;
+
+	IEventListener& operator=(const IEventListener&) = default;
+	IEventListener(const IEventListener&)			 = default;
+
+	virtual IEventListener& operator-=(const IStr* event_name)
+	{
+		this->RemoveEventListener(event_name);
+		return *this;
+	}
+
+	virtual IEventListener& operator+=(FnSign arg)
+	{
+		this->AddEventListener(arg);
+		return *this;
+	}
+};