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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file squirrel.hpp defines the Squirrel class */
#ifndef SQUIRREL_HPP
#define SQUIRREL_HPP
#include <squirrel.h>
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
bool crashed; ///< True if the squirrel script made an error.
int overdrawn_ops; ///< The amount of operations we have overdrawn.
/**
* 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 AIScanner;
friend class AIInstance;
friend void squirrel_register_std(Squirrel *engine);
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 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, uint value) { this->AddConst(var_name, (int)value); }
/**
* 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, bool 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);
/**
* Resume the VM with an error so it prints a stack trace.
*/
void ResumeError();
/**
* Tell the VM to do a garbage collection run.
*/
void CollectGarbage();
void InsertResult(bool result);
void InsertResult(int result);
void InsertResult(uint result) { this->InsertResult((int)result); }
/**
* Call a method of an instance, in various flavors.
* @return False if the script crashed or returned a wrong type.
*/
bool CallMethod(HSQOBJECT instance, const char *method_name, HSQOBJECT *ret, int suspend);
bool CallMethod(HSQOBJECT instance, const char *method_name, int suspend) { return this->CallMethod(instance, method_name, NULL, suspend); }
bool CallStringMethodStrdup(HSQOBJECT instance, const char *method_name, const char **res, int suspend);
bool CallIntegerMethod(HSQOBJECT instance, const char *method_name, int *res, int suspend);
bool CallBoolMethod(HSQOBJECT instance, const char *method_name, bool *res, int suspend);
/**
* Check if a method exists in an instance.
*/
bool MethodExists(HSQOBJECT instance, const char *method_name);
/**
* Creates a class instance.
* @param vm The VM to create the class instance for
* @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 SQ2OTTD(sq_objtostring(ptr)); }
/**
* Convert a Squirrel-object to an integer.
*/
static int ObjectToInteger(HSQOBJECT *ptr) { return sq_objtointeger(ptr); }
/**
* Convert a Squirrel-object to a bool.
*/
static bool ObjectToBool(HSQOBJECT *ptr) { return sq_objtobool(ptr) == 1; }
/**
* 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, OTTD2SQ(error)); }
/**
* Release a SQ object.
*/
void ReleaseObject(HSQOBJECT *ptr) { sq_release(this->vm, ptr); }
/**
* Tell the VM to remove \c amount ops from the number of ops till suspend.
*/
static void DecreaseOps(HSQUIRRELVM vm, int amount);
/**
* Did the squirrel code suspend or return normally.
* @return True if the function suspended.
*/
bool IsSuspended();
/**
* Find out if the squirrel script made an error before.
*/
bool HasScriptCrashed();
/**
* Reset the crashed status.
*/
void ResetCrashed();
/**
* Set the AI status to crashed.
*/
void CrashOccurred();
/**
* Are we allowed to suspend the squirrel script at this moment?
*/
bool CanSuspend();
};
#endif /* SQUIRREL_HPP */
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