diff --git a/src/script/squirrel.hpp b/src/script/squirrel.hpp
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--- /dev/null
+++ b/src/script/squirrel.hpp
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+/* $Id$ */
+
+/** @file squirrel.hpp defines the Squirrel class */
+
+#ifndef SQUIRREL_HPP
+#define SQUIRREL_HPP
+
+class Squirrel {
+private:
+	typedef void (SQPrintFunc)(bool error_msg, const SQChar *message);
+
+	HSQUIRRELVM vm;          ///< The VirtualMachine instnace for squirrel
+	void *global_pointer;    ///< Can be set by who ever initializes Squirrel
+	SQPrintFunc *print_func; ///< Points to either NULL, or a custom print handler
+
+	/**
+	 * The internal RunError handler. It looks up the real error and calls RunError with it.
+	 */
+	static SQInteger _RunError(HSQUIRRELVM vm);
+
+	/**
+	 * Get the squirrel VM. Try to avoid using this.
+	 */
+	HSQUIRRELVM GetVM() { return this->vm; }
+
+protected:
+	/**
+	 * The CompileError handler.
+	 */
+	static void CompileError(HSQUIRRELVM vm, const SQChar *desc, const SQChar *source, SQInteger line, SQInteger column);
+
+	/**
+	 * The RunError handler.
+	 */
+	static void RunError(HSQUIRRELVM vm, const SQChar *error);
+
+	/**
+	 * If a user runs 'print' inside a script, this function gets the params.
+	 */
+	static void PrintFunc(HSQUIRRELVM vm, const SQChar *s, ...);
+
+	/**
+	 * If an error has to be print, this function is called.
+	 */
+	static void ErrorPrintFunc(HSQUIRRELVM vm, const SQChar *s, ...);
+
+public:
+	friend class AIController;
+	friend class AIScanner;
+	friend class AIInstance;
+
+	Squirrel();
+	~Squirrel();
+
+	/**
+	 * Load a script.
+	 * @param script The full script-name to load.
+	 * @return False if loading failed.
+	 */
+	bool LoadScript(const char *script);
+	static bool LoadScript(HSQUIRRELVM vm, const char *script, bool in_root = true);
+
+	/**
+	 * Load a file to a given VM.
+	 */
+	static SQRESULT LoadFile(HSQUIRRELVM vm, const char *filename, SQBool printerror);
+
+	/**
+	 * Adds a function to the stack. Depending on the current state this means
+	 *  either a method or a global function.
+	 */
+	void AddMethod(const char *method_name, SQFUNCTION proc, uint nparam = 0, const char *params = NULL, void *userdata = NULL, int size = 0);
+
+	/**
+	 * Adds a const to the stack. Depending on the current state this means
+	 *  either a const to a class or to the global space.
+	 */
+	void AddConst(const char *var_name, int value);
+
+	/**
+	 * Adds a class to the global scope. Make sure to call AddClassEnd when you
+	 *  are done adding methods.
+	 */
+	void AddClassBegin(const char *class_name);
+
+	/**
+	 * Adds a class to the global scope, extending 'parent_class'.
+	 * Make sure to call AddClassEnd when you are done adding methods.
+	 */
+	void AddClassBegin(const char *class_name, const char *parent_class);
+
+	/**
+	 * Finishes adding a class to the global scope. If this isn't called, no
+	 *  class is really created.
+	 */
+	void AddClassEnd();
+
+	/**
+	 * Resume a VM when it was suspended via a throw.
+	 */
+	bool Resume(int suspend = -1);
+
+	void InsertResult(bool result);
+	void InsertResult(int result);
+
+	/**
+	 * Call a method of an instance, in various flavors.
+	 */
+	bool CallMethod(HSQOBJECT instance, const char *method_name, HSQOBJECT *ret, int suspend = -1);
+	bool CallMethod(HSQOBJECT instance, const char *method_name, int suspend = -1) { return this->CallMethod(instance, method_name, NULL, suspend); }
+	const char *CallStringMethodStrdup(HSQOBJECT instance, const char *method_name, int suspend = -1) { HSQOBJECT ret; this->CallMethod(instance, method_name, &ret, suspend); return strdup(ObjectToString(&ret)); }
+	int CallIntegerMethod(HSQOBJECT instance, const char *method_name, int suspend = -1) { HSQOBJECT ret; this->CallMethod(instance, method_name, &ret, suspend); return ObjectToInteger(&ret); }
+
+	/**
+	 * Check if a method exists in an instance.
+	 */
+	bool MethodExists(HSQOBJECT instance, const char *method_name);
+
+	/**
+	 * Creates a class instance.
+	 * @param class_name The name of the class of which we create an instance.
+	 * @param real_instance The instance to the real class, if it represents a real class.
+	 * @param instance Returning value with the pointer to the instance.
+	 * @param release_hook Optional param to give a release hook.
+	 * @return False if creating failed.
+	 */
+	static bool CreateClassInstanceVM(HSQUIRRELVM vm, const char *class_name, void *real_instance, HSQOBJECT *instance, SQRELEASEHOOK release_hook);
+
+	/**
+	 * Exactly the same as CreateClassInstanceVM, only callable without instance of Squirrel.
+	 */
+	bool CreateClassInstance(const char *class_name, void *real_instance, HSQOBJECT *instance);
+
+	/**
+	 * Get the real-instance pointer.
+	 * @note This will only work just after a function-call from within Squirrel
+	 *  to your C++ function.
+	 */
+	static bool GetRealInstance(HSQUIRRELVM vm, SQUserPointer *ptr) { return SQ_SUCCEEDED(sq_getinstanceup(vm, 1, ptr, 0)); }
+
+	/**
+	 * Get the Squirrel-instance pointer.
+	 * @note This will only work just after a function-call from within Squirrel
+	 *  to your C++ function.
+	 */
+	static bool GetInstance(HSQUIRRELVM vm, HSQOBJECT *ptr, int pos = 1) { sq_getclass(vm, pos); sq_getstackobj(vm, pos, ptr); sq_pop(vm, 1); return true; }
+
+	/**
+	 * Convert a Squirrel-object to a string.
+	 */
+	static const char *ObjectToString(HSQOBJECT *ptr) { return FS2OTTD(sq_objtostring(ptr)); }
+
+	/**
+	 * Convert a Squirrel-object to an integer.
+	 */
+	static int ObjectToInteger(HSQOBJECT *ptr) { return sq_objtointeger(ptr); }
+
+	/**
+	 * Sets a pointer in the VM that is reachable from where ever you are in SQ.
+	 *  Useful to keep track of the main instance.
+	 */
+	void SetGlobalPointer(void *ptr) { this->global_pointer = ptr; }
+
+	/**
+	 * Get the pointer as set by SetGlobalPointer.
+	 */
+	static void *GetGlobalPointer(HSQUIRRELVM vm) { return ((Squirrel *)sq_getforeignptr(vm))->global_pointer; }
+
+	/**
+	 * Set a custom print function, so you can handle outputs from SQ yourself.
+	 */
+	void SetPrintFunction(SQPrintFunc *func) { this->print_func = func; }
+
+	/**
+	 * Throw a Squirrel error that will be nicely displayed to the user.
+	 */
+	void ThrowError(const char *error) { sq_throwerror(this->vm, OTTD2FS(error)); }
+
+	/**
+	 * Release a SQ object.
+	 */
+	void ReleaseObject(HSQOBJECT *ptr) { sq_release(this->vm, ptr); }
+};
+
+#endif /* SQUIRREL_HPP */