Squirrel Class Reference

Public Member Functions
	Squirrel (std::string_view api_name)
HSQUIRRELVM	GetVM ()
	Get the squirrel VM.
bool	LoadScript (const std::string &script)
	Load a script.
bool	LoadScript (HSQUIRRELVM vm, const std::string &script, bool in_root=true)
SQRESULT	LoadFile (HSQUIRRELVM vm, const std::string &filename, SQBool printerror)
	Load a file to a given VM.
void	AddMethod (std::string_view method_name, SQFUNCTION proc, std::string_view params={}, void *userdata=nullptr, int size=0)
	Adds a function to the stack.
void	AddConst (std::string_view var_name, int value)
	Adds a const to the stack.
void	AddConst (std::string_view var_name, uint value)
	Adds a const to the stack.
void	AddConst (std::string_view var_name, const ConvertibleThroughBase auto &value)
void	AddConst (std::string_view var_name, bool value)
	Adds a const to the stack.
void	AddClassBegin (std::string_view class_name)
	Adds a class to the global scope.
void	AddClassBegin (std::string_view class_name, std::string_view parent_class)
	Adds a class to the global scope, extending 'parent_class'.
void	AddClassEnd ()
	Finishes adding a class to the global scope.
bool	Resume (int suspend=-1)
	Resume a VM when it was suspended via a throw.
void	ResumeError ()
	Resume the VM with an error so it prints a stack trace.
void	CollectGarbage ()
	Tell the VM to do a garbage collection run.
void	InsertResult (bool result)
void	InsertResult (int result)
void	InsertResult (uint result)
void	InsertResult (ConvertibleThroughBase auto result)
bool	CallMethod (HSQOBJECT instance, std::string_view method_name, HSQOBJECT *ret, int suspend)
	Call a method of an instance, in various flavors.
bool	CallMethod (HSQOBJECT instance, std::string_view method_name, int suspend)
bool	CallStringMethod (HSQOBJECT instance, std::string_view method_name, std::string *res, int suspend)
bool	CallIntegerMethod (HSQOBJECT instance, std::string_view method_name, int *res, int suspend)
bool	CallBoolMethod (HSQOBJECT instance, std::string_view method_name, bool *res, int suspend)
bool	MethodExists (HSQOBJECT instance, std::string_view method_name)
	Check if a method exists in an instance.
bool	CreateClassInstance (const std::string &class_name, void *real_instance, HSQOBJECT *instance)
	Exactly the same as CreateClassInstanceVM, only callable without instance of Squirrel.
void	SetGlobalPointer (void *ptr)
	Sets a pointer in the VM that is reachable from where ever you are in SQ.
void	SetPrintFunction (SQPrintFunc *func)
	Set a custom print function, so you can handle outputs from SQ yourself.
void	ThrowError (const std::string_view error)
	Throw a Squirrel error that will be nicely displayed to the user.
void	ReleaseObject (HSQOBJECT *ptr)
	Release a SQ object.
bool	IsSuspended ()
	Did the squirrel code suspend or return normally.
bool	HasScriptCrashed ()
	Find out if the squirrel script made an error before.
void	CrashOccurred ()
	Set the script status to crashed.
bool	CanSuspend ()
	Are we allowed to suspend the squirrel script at this moment?
SQInteger	GetOpsTillSuspend ()
	How many operations can we execute till suspension?
void	Reset ()
	Completely reset the engine; start from scratch.
size_t	GetAllocatedMemory () const noexcept
	Get number of bytes allocated by this VM.

Static Public Member Functions
static bool	CreateClassInstanceVM (HSQUIRRELVM vm, const std::string &class_name, void *real_instance, HSQOBJECT *instance, SQRELEASEHOOK release_hook, bool prepend_API_name=false)
	Creates a class instance.
static SQUserPointer	GetRealInstance (HSQUIRRELVM vm, int index, std::string_view tag)
	Get the real-instance pointer.
static bool	GetInstance (HSQUIRRELVM vm, HSQOBJECT *ptr, int pos=1)
	Get the Squirrel-instance pointer.
static std::string_view	ObjectToString (HSQOBJECT *ptr)
	Convert a Squirrel-object to a string.
static int	ObjectToInteger (HSQOBJECT *ptr)
	Convert a Squirrel-object to an integer.
static bool	ObjectToBool (HSQOBJECT *ptr)
	Convert a Squirrel-object to a bool.
static void *	GetGlobalPointer (HSQUIRRELVM vm)
	Get the pointer as set by SetGlobalPointer.
static void	DecreaseOps (HSQUIRRELVM vm, int amount)
	Tell the VM to remove amount ops from the number of ops till suspend.

Static Protected Member Functions
static void	CompileError (HSQUIRRELVM vm, const SQChar *desc, const SQChar *source, SQInteger line, SQInteger column)
	The CompileError handler.
static void	RunError (HSQUIRRELVM vm, const SQChar *error)
	The RunError handler.
static void	PrintFunc (HSQUIRRELVM vm, const std::string &s)
	If a user runs 'print' inside a script, this function gets the params.
static void	ErrorPrintFunc (HSQUIRRELVM vm, const std::string &s)
	If an error has to be print, this function is called.

Private Types
typedef void()	SQPrintFunc(bool error_msg, const std::string &message)

Private Member Functions
std::string_view	GetAPIName ()
	Get the API name.
void	Initialize ()
	Perform all initialization steps to create the engine.
void	Uninitialize ()
	Perform all the cleanups for the engine.

Static Private Member Functions
static SQInteger	_RunError (HSQUIRRELVM vm)
	The internal RunError handler.

Private Attributes
HSQUIRRELVM	vm
	The VirtualMachine instance for squirrel.
void *	global_pointer
	Can be set by who ever initializes Squirrel.
SQPrintFunc *	print_func
	Points to either nullptr, 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.
std::string_view	api_name
	Name of the API used for this squirrel.
std::unique_ptr< ScriptAllocator >	allocator
	Allocator object used by this script.

Friends
class	ScriptAllocatorScope
class	ScriptInstance

Detailed Description

Definition at line 24 of file squirrel.hpp.

Member Typedef Documentation

SQPrintFunc

typedef void() Squirrel::SQPrintFunc(bool error_msg, const std::string &message)

private

Definition at line 29 of file squirrel.hpp.

Constructor & Destructor Documentation

Squirrel()

Squirrel::Squirrel

(

std::string_view

api_name

)

Definition at line 507 of file squirrel.cpp.

~Squirrel()

Squirrel::~Squirrel

(

)

Definition at line 715 of file squirrel.cpp.

Member Function Documentation

_RunError()

SQInteger Squirrel::_RunError ( HSQUIRRELVM  vm )

staticprivate

The internal RunError handler.

It looks up the real error and calls RunError with it.

Definition at line 230 of file squirrel.cpp.

References RunError(), and vm.

Referenced by Initialize().

AddClassBegin() [1/2]

void Squirrel::AddClassBegin

(

std::string_view

class_name

)

Adds a class to the global scope.

Make sure to call AddClassEnd when you are done adding methods.

Definition at line 291 of file squirrel.cpp.

References vm.

Referenced by AILibrary::RegisterAPI(), and GameLibrary::RegisterAPI().

AddClassBegin() [2/2]

void Squirrel::AddClassBegin	(	std::string_view	class_name,
		std::string_view	parent_class
	)

Adds a class to the global scope, extending 'parent_class'.

Make sure to call AddClassEnd when you are done adding methods.

Definition at line 300 of file squirrel.cpp.

References Debug, and vm.

AddClassEnd()

void Squirrel::AddClassEnd

(

)

Finishes adding a class to the global scope.

If this isn't called, no class is really created.

Definition at line 315 of file squirrel.cpp.

References vm.

Referenced by AILibrary::RegisterAPI(), and GameLibrary::RegisterAPI().

AddConst() [1/4]

void Squirrel::AddConst	(	std::string_view	var_name,
		bool	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.

Definition at line 282 of file squirrel.cpp.

References vm.

AddConst() [2/4]

void Squirrel::AddConst ( std::string_view  var_name, const ConvertibleThroughBase auto &  value  )

inline

Definition at line 115 of file squirrel.hpp.

AddConst() [3/4]

void Squirrel::AddConst	(	std::string_view	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.

Definition at line 273 of file squirrel.cpp.

References vm.

AddConst() [4/4]

void Squirrel::AddConst ( std::string_view  var_name, uint  value  )

inline

Adds a const to the stack.

Depending on the current state this means either a const to a class or to the global space.

Definition at line 113 of file squirrel.hpp.

References AddConst().

Referenced by AddConst().

AddMethod()

void Squirrel::AddMethod	(	std::string_view	method_name,
		SQFUNCTION	proc,
		std::string_view	params = {},
		void *	userdata = nullptr,
		int	size = 0
	)

Adds a function to the stack.

Depending on the current state this means either a method or a global function.

Definition at line 256 of file squirrel.cpp.

References vm.

Referenced by DefSQClass< CL, ST >::DefSQAdvancedMethod(), DefSQClass< CL, ST >::DefSQAdvancedStaticMethod(), DefSQClass< CL, ST >::DefSQMethod(), DefSQClass< CL, ST >::DefSQMethod(), DefSQClass< CL, ST >::DefSQStaticMethod(), DefSQClass< CL, ST >::DefSQStaticMethod(), AIInfo::RegisterAPI(), AILibrary::RegisterAPI(), GameInfo::RegisterAPI(), GameLibrary::RegisterAPI(), squirrel_register_global_std(), and squirrel_register_std().

CallBoolMethod()

bool Squirrel::CallBoolMethod	(	HSQOBJECT	instance,
		std::string_view	method_name,
		bool *	res,
		int	suspend
	)

Definition at line 428 of file squirrel.cpp.

CallIntegerMethod()

bool Squirrel::CallIntegerMethod	(	HSQOBJECT	instance,
		std::string_view	method_name,
		int *	res,
		int	suspend
	)

Definition at line 419 of file squirrel.cpp.

CallMethod() [1/2]

bool Squirrel::CallMethod	(	HSQOBJECT	instance,
		std::string_view	method_name,
		HSQOBJECT *	ret,
		int	suspend
	)

Call a method of an instance, in various flavors.

Returns

False if the script crashed or returned a wrong type.

Definition at line 376 of file squirrel.cpp.

References crashed, Debug, IsSuspended(), and vm.

Referenced by ScriptInstance::GameLoop(), ScriptInfo::GetSettings(), and ScriptInstance::Save().

CallMethod() [2/2]

bool Squirrel::CallMethod ( HSQOBJECT  instance, std::string_view  method_name, int  suspend  )

inline

Definition at line 166 of file squirrel.hpp.

CallStringMethod()

bool Squirrel::CallStringMethod	(	HSQOBJECT	instance,
		std::string_view	method_name,
		std::string *	res,
		int	suspend
	)

Definition at line 410 of file squirrel.cpp.

CanSuspend()

bool Squirrel::CanSuspend

(

)

Are we allowed to suspend the squirrel script at this moment?

Definition at line 786 of file squirrel.cpp.

CollectGarbage()

void Squirrel::CollectGarbage

(

)

Tell the VM to do a garbage collection run.

Definition at line 370 of file squirrel.cpp.

References vm.

Referenced by ScriptInstance::CollectGarbage().

CompileError()

void Squirrel::CompileError ( HSQUIRRELVM  vm, const SQChar *  desc, const SQChar *  source, SQInteger  line, SQInteger  column  )

staticprotected

The CompileError handler.

Definition at line 182 of file squirrel.cpp.

References crashed, Debug, print_func, and vm.

Referenced by Initialize().

CrashOccurred()

void Squirrel::CrashOccurred

(

)

Set the script status to crashed.

Definition at line 781 of file squirrel.cpp.

References crashed.

Referenced by ScriptInstance::Save().

CreateClassInstance()

bool Squirrel::CreateClassInstance	(	const std::string &	class_name,
		void *	real_instance,
		HSQOBJECT *	instance
	)

Exactly the same as CreateClassInstanceVM, only callable without instance of Squirrel.

Definition at line 484 of file squirrel.cpp.

References CreateClassInstanceVM(), and vm.

Referenced by ScriptInstance::Initialize().

CreateClassInstanceVM()

bool Squirrel::CreateClassInstanceVM ( HSQUIRRELVM  vm, const std::string &  class_name, void *  real_instance, HSQOBJECT *  instance, SQRELEASEHOOK  release_hook, bool  prepend_API_name = false  )

static

Creates a class instance.

Parameters

vm	The VM to create the class instance for
class_name	The name of the class of which we create an instance.
real_instance	The instance to the real class, if it represents a real class.
instance	Returning value with the pointer to the instance.
release_hook	Optional param to give a release hook.
prepend_API_name	Optional parameter; if true, the class_name is prefixed with the current API name.

Returns

False if creating failed.

Definition at line 437 of file squirrel.cpp.

References Debug, GetAPIName(), and vm.

Referenced by CreateClassInstance().

DecreaseOps()

void Squirrel::DecreaseOps ( HSQUIRRELVM  vm, int  amount  )

static

Tell the VM to remove amount ops from the number of ops till suspend.

Definition at line 766 of file squirrel.cpp.

References vm.

Referenced by ScriptInstance::Pause().

ErrorPrintFunc()

void Squirrel::ErrorPrintFunc ( HSQUIRRELVM  vm, const std::string &  s  )

staticprotected

If an error has to be print, this function is called.

Definition at line 197 of file squirrel.cpp.

References print_func, and vm.

Referenced by RunError().

GetAllocatedMemory()

size_t Squirrel::GetAllocatedMemory ( ) const

noexcept

Get number of bytes allocated by this VM.

Definition at line 175 of file squirrel.cpp.

GetAPIName()

std::string_view Squirrel::GetAPIName ( )

inlineprivate

Get the API name.

Definition at line 47 of file squirrel.hpp.

References api_name.

Referenced by CreateClassInstanceVM(), GetRealInstance(), and LoadFile().

GetGlobalPointer()

static void * Squirrel::GetGlobalPointer ( HSQUIRRELVM  vm )

inlinestatic

Get the pointer as set by SetGlobalPointer.

Definition at line 231 of file squirrel.hpp.

References vm.

Referenced by ScriptInfo::Constructor().

GetInstance()

static bool Squirrel::GetInstance ( HSQUIRRELVM  vm, HSQOBJECT *  ptr, int  pos = 1  )

inlinestatic

Get the Squirrel-instance pointer.

Note

This will only work just after a function-call from within Squirrel to your C++ function.

Definition at line 205 of file squirrel.hpp.

References vm.

Referenced by ScriptInfo::Constructor(), SQConvert::DefSQAdvancedNonStaticCallback(), and SQConvert::DefSQNonStaticCallback().

GetOpsTillSuspend()

SQInteger Squirrel::GetOpsTillSuspend

(

)

How many operations can we execute till suspension?

Definition at line 792 of file squirrel.cpp.

Referenced by ScriptInstance::GetOpsTillSuspend().

GetRealInstance()

SQUserPointer Squirrel::GetRealInstance ( HSQUIRRELVM  vm, int  index, std::string_view  tag  )

static

Get the real-instance pointer.

Note

This will only work just after a function-call from within Squirrel to your C++ function.

Definition at line 490 of file squirrel.cpp.

References GetAPIName(), and vm.

Referenced by ScriptInstance::SaveObject().

GetVM()

HSQUIRRELVM Squirrel::GetVM ( )

inline

Get the squirrel VM.

Try to avoid using this.

Definition at line 82 of file squirrel.hpp.

References vm.

Referenced by ScriptInstance::CallLoad(), ScriptInstance::GameLoop(), AIInstance::LoadDummyScript(), ScriptInstance::LoadOnStack(), ScriptInstance::Pause(), RegisterGameTranslation(), ScriptInstance::Save(), and squirrel_register_std().

HasScriptCrashed()

bool Squirrel::HasScriptCrashed

(

)

Find out if the squirrel script made an error before.

Definition at line 776 of file squirrel.cpp.

References crashed.

Referenced by ScriptInstance::GameLoop(), and ScriptInstance::Save().

Initialize()

void Squirrel::Initialize ( )

private

Perform all initialization steps to create the engine.

Definition at line 513 of file squirrel.cpp.

References _RunError(), CompileError(), crashed, global_pointer, overdrawn_ops, print_func, PrintFunc(), squirrel_register_global_std(), and vm.

Referenced by Reset().

InsertResult() [1/4]

void Squirrel::InsertResult

(

bool

result

)

Definition at line 744 of file squirrel.cpp.

InsertResult() [2/4]

void Squirrel::InsertResult ( ConvertibleThroughBase auto  result )

inline

Definition at line 159 of file squirrel.hpp.

InsertResult() [3/4]

void Squirrel::InsertResult

(

int

result

)

Definition at line 755 of file squirrel.cpp.

InsertResult() [4/4]

void Squirrel::InsertResult ( uint  result )

inline

Definition at line 158 of file squirrel.hpp.

IsSuspended()

bool Squirrel::IsSuspended

(

)

Did the squirrel code suspend or return normally.

Returns

True if the function suspended.

Definition at line 771 of file squirrel.cpp.

Referenced by CallMethod(), ScriptInstance::GameLoop(), ScriptInstance::Initialize(), and ScriptInstance::Save().

LoadFile()

SQRESULT Squirrel::LoadFile	(	HSQUIRRELVM	vm,
		const std::string &	filename,
		SQBool	printerror
	)

Load a file to a given VM.

Definition at line 619 of file squirrel.cpp.

References AI_DIR, AI_LIBRARY_DIR, FioFOpenFile(), GAME_DIR, GAME_LIBRARY_DIR, GetAPIName(), and vm.

LoadScript() [1/2]

bool Squirrel::LoadScript

(

const std::string &

script

)

Load a script.

Parameters

script

The full script-name to load.

Returns

False if loading failed.

Definition at line 710 of file squirrel.cpp.

References LoadScript().

Referenced by ScriptScanner::AddFile(), ScriptInstance::Initialize(), ScriptInstance::LoadCompatibilityScript(), LoadScript(), and SquirrelStd::require().

LoadScript() [2/2]

bool Squirrel::LoadScript	(	HSQUIRRELVM	vm,
		const std::string &	script,
		bool	in_root = true
	)

Definition at line 686 of file squirrel.cpp.

MethodExists()

bool Squirrel::MethodExists	(	HSQOBJECT	instance,
		std::string_view	method_name
	)

Check if a method exists in an instance.

Definition at line 323 of file squirrel.cpp.

References crashed, and vm.

Referenced by ScriptInstance::CallLoad(), ScriptInfo::CheckMethod(), AIInfo::Constructor(), GameInfo::Constructor(), ScriptInfo::Constructor(), ScriptInstance::GameLoop(), and ScriptInstance::Save().

ObjectToBool()

static bool Squirrel::ObjectToBool ( HSQOBJECT *  ptr )

inlinestatic

Convert a Squirrel-object to a bool.

Definition at line 220 of file squirrel.hpp.

ObjectToInteger()

static int Squirrel::ObjectToInteger ( HSQOBJECT *  ptr )

inlinestatic

Convert a Squirrel-object to an integer.

Definition at line 215 of file squirrel.hpp.

ObjectToString()

static std::string_view Squirrel::ObjectToString ( HSQOBJECT *  ptr )

inlinestatic

Convert a Squirrel-object to a string.

Definition at line 210 of file squirrel.hpp.

PrintFunc()

void Squirrel::PrintFunc ( HSQUIRRELVM  vm, const std::string &  s  )

staticprotected

If a user runs 'print' inside a script, this function gets the params.

Definition at line 245 of file squirrel.cpp.

References print_func, and vm.

Referenced by Initialize().

ReleaseObject()

void Squirrel::ReleaseObject ( HSQOBJECT *  ptr )

inline

Release a SQ object.

Definition at line 246 of file squirrel.hpp.

Referenced by ScriptInstance::Died(), and ScriptInstance::ReleaseSQObject().

Reset()

void Squirrel::Reset

(

)

Completely reset the engine; start from scratch.

Definition at line 738 of file squirrel.cpp.

References Initialize(), and Uninitialize().

Referenced by ScriptScanner::ResetEngine().

Resume()

bool Squirrel::Resume

(

int

suspend = -1

)

Resume a VM when it was suspended via a throw.

Definition at line 341 of file squirrel.cpp.

References crashed, overdrawn_ops, and vm.

Referenced by ScriptInstance::GameLoop().

ResumeError()

void Squirrel::ResumeError

(

)

Resume the VM with an error so it prints a stack trace.

Definition at line 363 of file squirrel.cpp.

References crashed, and vm.

Referenced by ScriptInstance::GameLoop(), ScriptInstance::Initialize(), and ScriptInstance::Save().

RunError()

void Squirrel::RunError ( HSQUIRRELVM  vm, const SQChar *  error  )

staticprotected

The RunError handler.

Definition at line 208 of file squirrel.cpp.

References ErrorPrintFunc(), print_func, and vm.

Referenced by _RunError().

SetGlobalPointer()

void Squirrel::SetGlobalPointer ( void *  ptr )

inline

Sets a pointer in the VM that is reachable from where ever you are in SQ.

Useful to keep track of the main instance.

Definition at line 226 of file squirrel.hpp.

Referenced by ScriptInstance::Initialize(), and ScriptScanner::ResetEngine().

SetPrintFunction()

void Squirrel::SetPrintFunction ( SQPrintFunc *  func )

inline

Set a custom print function, so you can handle outputs from SQ yourself.

Definition at line 236 of file squirrel.hpp.

Referenced by ScriptInstance::ScriptInstance().

ThrowError()

void Squirrel::ThrowError ( const std::string_view  error )

inline

Throw a Squirrel error that will be nicely displayed to the user.

Definition at line 241 of file squirrel.hpp.

Referenced by ScriptInfo::AddLabels(), ScriptInfo::AddSetting(), ScriptInfo::CheckMethod(), ScriptInstance::GameLoop(), ScriptInstance::Initialize(), and ScriptInstance::Save().

Uninitialize()

void Squirrel::Uninitialize ( )

private

Perform all the cleanups for the engine.

Definition at line 720 of file squirrel.cpp.

Referenced by Reset().

Friends And Related Symbol Documentation

ScriptAllocatorScope

friend class ScriptAllocatorScope

friend

Definition at line 25 of file squirrel.hpp.

ScriptInstance

friend class ScriptInstance

friend

Definition at line 26 of file squirrel.hpp.

Field Documentation

allocator

std::unique_ptr<ScriptAllocator> Squirrel::allocator

private

Allocator object used by this script.

Definition at line 37 of file squirrel.hpp.

api_name

std::string_view Squirrel::api_name

private

Name of the API used for this squirrel.

Definition at line 36 of file squirrel.hpp.

Referenced by GetAPIName().

crashed

bool Squirrel::crashed

private

True if the squirrel script made an error.

Definition at line 34 of file squirrel.hpp.

Referenced by CallMethod(), CompileError(), CrashOccurred(), HasScriptCrashed(), Initialize(), MethodExists(), Resume(), and ResumeError().

global_pointer

void* Squirrel::global_pointer

private

Can be set by who ever initializes Squirrel.

Definition at line 32 of file squirrel.hpp.

Referenced by Initialize().

overdrawn_ops

int Squirrel::overdrawn_ops

private

The amount of operations we have overdrawn.

Definition at line 35 of file squirrel.hpp.

Referenced by Initialize(), and Resume().

print_func

SQPrintFunc* Squirrel::print_func

private

Points to either nullptr, or a custom print handler.

Definition at line 33 of file squirrel.hpp.

Referenced by CompileError(), ErrorPrintFunc(), Initialize(), PrintFunc(), and RunError().

vm

HSQUIRRELVM Squirrel::vm

private

The VirtualMachine instance for squirrel.

Definition at line 31 of file squirrel.hpp.

Referenced by _RunError(), AddClassBegin(), AddClassBegin(), AddClassEnd(), AddConst(), AddConst(), AddMethod(), CallMethod(), CollectGarbage(), CompileError(), CreateClassInstance(), CreateClassInstanceVM(), DecreaseOps(), ErrorPrintFunc(), GetGlobalPointer(), GetInstance(), GetRealInstance(), GetVM(), Initialize(), LoadFile(), MethodExists(), PrintFunc(), Resume(), ResumeError(), and RunError().

---

The documentation for this class was generated from the following files:

• src/script/squirrel.hpp
• src/script/squirrel.cpp