Script interpreter for running a loaded script. More...

#include <ScriptInterpreter.h>

Inheritance diagram for sf::ScriptInterpreter:

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Collaboration diagram for sf::ScriptInterpreter:

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Classes
struct	CodePos
	Position in the source with line and offset. More...

struct	Instruction
	Executable instruction as result of interpreting the script. More...

Public Types
enum	EState { esError = 0 , esEmpty , esCompiled , esRunning , esReady , esCurrent }
	State of the running script. More...

enum	EExecMode { emInit , emRun , emStart , emStep , emAbort }
	Enumerate for indicating the mode of execution. More...

typedef TListener< const ScriptInterpreter * >	ChangeListener
	Declare type for listening and at teh sme time a type for emitting the changes of the script like State and Error and execution pointer.

Public Types inherited from sf::ScriptEngine
enum	EArithError { aeCurrent = -1 , aeSuccess = 0 , aeStringTooLong , aeUnexpectedEnd , aeUnexpectedCharacter , aeUnexpectedIdentifier , aeExpectedRightParenthesis , aeExpectedLeftParenthesis , aeExpectedDelimiter , aeExpectedFunction , aeExpectedIdentifier , aeUnknownFunction , aeUnknownConstant , aeUnknownVariable , aeUnknownSymbol , aeUnknownIdentifier , aeUnknownObjectMember , aeAssignConstant , aeMaxIdentifierLength , aeTooManyParameters , aeTooFewParameters , aeMultipleDeclaration , aeUnexpectedKeyword , aeDivisionByZero , aeLabelNotFound , aeIpStack , aeExternalKeyword , aeScriptTimeout , aeFunctionError , aeNotLValue , aeNotObject , aeCompilerImplementationError }
	Errors when compiling a script. More...

Public Types inherited from sf::ScriptObject
enum	EIdentifier { idUnknown = 0 , idConstant , idVariable , idFunction , idTypedef , idKeyword }
	Keyword identifiers. More...

typedef std::string::size_type	pos_type
	Source position type.

typedef ssize_t	ip_type
	Instruction pointer type.

Public Member Functions
	ScriptInterpreter ()
	Default constructor.

	~ScriptInterpreter () override
	Virtual destructor.

ChangeListener::emitter_type &	getChangeEmitter ()
	Gets the emitter for change events.

std::string	getScriptName () const
	Returns the name given by the user.

void	setScriptName (const std::string &name)
	Sets the name given by the user.

void	setOutputStream (std::ostream *os)
	Sets and enables debugging output stream.

EState	Execute (EExecMode exec_mode=emRun)
	Executes a macro depending on the execution mode.

bool	compile (const char *cmd)
	Compiles the passed script text and outputs debug info to the stream.

const char *	getStateName (EState exec_state=esCurrent) const
	Gets the execution state name from the passed state or the current one on state 'esCurrent'.

EState	getState () const

std::string	getDebugText () const

CodePos	getErrorPos () const

ip_type	getInstructionPtr () const

ip_type	getErrorInstructionPtr () const
	Gets the error instruction pointer in case of an error.

std::string	getInstructionText (ip_type ip) const
	Gets the instruction text at pointer IP.

void	flush ()
	Calls the protected virtual clear function.

bool	callFunction (const std::string &name, bool step_mode)

void	callFunction (ip_type ip, bool step_mode)
	Makes it possible to execute function/gosub.

void	setMaxLoopTime (unsigned long usec)
	Sets the maximum loop time for this instance.

strings	getInfoNames () const override
	Gets names of info structures in lines.

const IdInfo *	getInfo (const std::string &name) const override

const TVector< Instruction > &	getInstructions () const
	Gets the instruction text at pointer IP.

const TVector< VariableInfo * > &	getVariables () const
	Gets the current variables declared in the script.

strings	getIdentifiers (EIdentifier id) const override
	Gets a list of available identifiers.

bool	isStepMode () const
	Get the step mode of the script.

Public Member Functions inherited from sf::ScriptEngine
	ScriptEngine ()
	Default constructor.

bool	calculate (const std::string &script, Value &result)
	Calculates the passed script.

EArithError	getError () const
	Gets the error value of this instance.

std::string	getErrorReason () const
	Gets the associated error reason string.

bool	setError (EArithError error_value, const std::string &reason=std::string())
	Sets the error value for this instance.

const char *	getErrorText (EArithError error_value=EArithError::aeCurrent) const

pos_type	getPos () const
	Gets the current position.

Public Member Functions inherited from sf::ScriptObject
	ScriptObject (const char type_name, ScriptObject parent=nullptr)

virtual	~ScriptObject ()=default
	Virtual destructor which can be overloaded to clean up objects.

virtual std::string	getStatusText ()
	Gets the status text of this object for debugging purposes.

int	getRefCount () const
	Gets the reference count.

	operator Value () const
	Cast operator to be able to return this instance as a Value.

std::string	getTypeName () const
	Returns the type name Set at the constructor.

ScriptObject *	getParent ()
	Gets the script object owner.

const ScriptObject *	getParent () const
	Gets the script object owner.

ScriptObject *	castToObject (const Value &value)
	Casts a sf::Value::vitCustom typed sf::Value to a ScriptObject typed pointer.

Protected Types
enum	EExitCode { ecNormal = 0 , ecError , ecScript , ecApplication }
	Possible exit codes. More...

enum	EKeyWord { kwNone = 0 , kwIf , kwWhile , kwElse , kwGoto , kwBreak , kwContinue , kwSubroutine , kwReturn , kwExternal , kwExtern }
	Keywords available for the script. More...

Protected Member Functions
bool	getSetValue (const IdInfo info, Value value, Value::vector_type *params, bool flag_set) override
	Overridden from ScriptEngine class.

virtual bool	compileAdditionalStatement (const IdInfo *info, const std::string &source)
	Compile external supplied keyword.

virtual void	exitFunction (EExitCode exitcode, const Value &value)
	Function is called at the exit of the script.

virtual void	clear ()
	Clears compiled data can be overloaded by derived classes.

virtual void	linkInstruction ()
	Links the labels of the calls in the script.

void	setState (EState exec_state)
	Sets the execution state.

ip_type	getLabelIp (const std::string &name)
	Gets the ip from the label name.

Protected Member Functions inherited from sf::ScriptEngine
bool	isAlpha (char ch)
	Determines if the passed character is an alpha one.

Protected Member Functions inherited from sf::ScriptObject
void	makeParent (ScriptObject *so)
	Makes this object the owner of the other object.

void	setParent (ScriptObject *parent)
	Sets the owner to the pass script object.

Protected Attributes
ElapseTimer	_loopTimer
	Timer to prevent endless loops.

std::ostream *	_outputStream {nullptr}
	Output stream to write debug information to.

Additional Inherited Members
Static Public Member Functions inherited from sf::ScriptObject
static const IdInfo *	getInfoUnknown ()
	Returns the static Info structure for unknowns.

Detailed Description

Script interpreter for running a loaded script.

Member Typedef Documentation

◆ ChangeListener

typedef TListener<const ScriptInterpreter*> sf::ScriptInterpreter::ChangeListener

Declare type for listening and at teh sme time a type for emitting the changes of the script like State and Error and execution pointer.

Member Enumeration Documentation

◆ EExecMode

enum sf::ScriptInterpreter::EExecMode

Enumerate for indicating the mode of execution.

Enumerator
emInit	Initialize script in continues mode.
emRun	Run script in continuous mode.
emStart	Starts a stepping macro again.
emStep	Execute only one instruction and return.
emAbort	To abort a running script.

◆ EExitCode

enum sf::ScriptInterpreter::EExitCode

protected

Possible exit codes.

Enumerator
ecNormal	Default normal stop at end of script
ecError	Exit as result of an error in the script
ecScript	Script exited by script function Exit()
ecApplication	Script exited by Execute() member function

◆ EKeyWord

enum sf::ScriptInterpreter::EKeyWord

protected

Keywords available for the script.

Enumerator
kwNone
kwIf
kwWhile
kwElse
kwGoto
kwBreak
kwContinue
kwSubroutine
kwReturn
kwExternal
kwExtern

◆ EState

enum sf::ScriptInterpreter::EState

State of the running script.

Enumerator
esError	Script went into an error due to compiling or running.
esEmpty	Script is empty
esCompiled	Script is compiled and ready for initialization.
esRunning	Script is running in step mode. (also internally used in run mode)
esReady	Script is initialized and ready for running or just finished running.
esCurrent	When passed to getStateName() the current state is used.

Constructor & Destructor Documentation

◆ ScriptInterpreter()

sf::ScriptInterpreter::ScriptInterpreter ( )

Default constructor.

◆ ~ScriptInterpreter()

sf::ScriptInterpreter::~ScriptInterpreter ( )

override

Virtual destructor.

Member Function Documentation

◆ callFunction() [1/2]

bool sf::ScriptInterpreter::callFunction	(	const std::string &	name,
		bool	step_mode
	)

Calls a label/function in the script.

Parameters

name	Name of the label.
step_mode	When true in step mode

Returns: True when label/function was found.

◆ callFunction() [2/2]

void sf::ScriptInterpreter::callFunction	(	ip_type	ip,
		bool	step_mode
	)

Makes it possible to execute function/gosub.

◆ clear()

virtual void sf::ScriptInterpreter::clear ( )

protectedvirtual

Clears compiled data can be overloaded by derived classes.

◆ compile()

bool sf::ScriptInterpreter::compile ( const char * cmd )

Compiles the passed script text and outputs debug info to the stream.

Parameters

cmd	Script to compile.

Returns: True when successful.

◆ compileAdditionalStatement()

virtual bool sf::ScriptInterpreter::compileAdditionalStatement	(	const IdInfo *	info,
		const std::string &	source
	)

protectedvirtual

Compile external supplied keyword.

Returns: On error it returns 'false'.

◆ Execute()

EState sf::ScriptInterpreter::Execute ( EExecMode exec_mode = emRun )

Executes a macro depending on the execution mode.

Returns: State execution.

◆ exitFunction()

virtual void sf::ScriptInterpreter::exitFunction	(	EExitCode	exitcode,
		const Value &	value
	)

protectedvirtual

Function is called at the exit of the script.

Parameters

exitcode	Exit code provided.
value

◆ flush()

void sf::ScriptInterpreter::flush ( )

Calls the protected virtual clear function.

◆ getChangeEmitter()

ChangeListener::emitter_type & sf::ScriptInterpreter::getChangeEmitter ( )

inline

Gets the emitter for change events.

◆ getDebugText()

std::string sf::ScriptInterpreter::getDebugText ( ) const

Gets the debug text.

◆ getErrorInstructionPtr()

ip_type sf::ScriptInterpreter::getErrorInstructionPtr ( ) const

Gets the error instruction pointer in case of an error.

◆ getErrorPos()

CodePos sf::ScriptInterpreter::getErrorPos ( ) const

Returns the current error position where the compiler stopped.

◆ getIdentifiers()

strings sf::ScriptInterpreter::getIdentifiers ( EIdentifier id ) const

overridevirtual

Gets a list of available identifiers.

Used for syntax high lighting for example or code completion.

Reimplemented from sf::ScriptEngine.

◆ getInfo()

const IdInfo * sf::ScriptInterpreter::getInfo ( const std::string & name ) const

overridevirtual

Overloaded from base class to append more information on identifier/keywords.

Parameters

name	Name of the identifier or keyword.

Returns: Information when found else nullptr.

Reimplemented from sf::ScriptEngine.

◆ getInfoNames()

strings sf::ScriptInterpreter::getInfoNames ( ) const

overridevirtual

Gets names of info structures in lines.

Reimplemented from sf::ScriptEngine.

◆ getInstructionPtr()

ip_type sf::ScriptInterpreter::getInstructionPtr ( ) const

Gets the current instruction pointer.

◆ getInstructions()

const TVector< Instruction > & sf::ScriptInterpreter::getInstructions ( ) const

inline

Gets the instruction text at pointer IP.

◆ getInstructionText()

std::string sf::ScriptInterpreter::getInstructionText ( ip_type ip ) const

Gets the instruction text at pointer IP.

◆ getLabelIp()

ip_type sf::ScriptInterpreter::getLabelIp ( const std::string & name )

protected

Gets the ip from the label name.

Returns: On failure -1.

◆ getScriptName()

std::string sf::ScriptInterpreter::getScriptName ( ) const

Returns the name given by the user.

Is used for referencing when debugging.

◆ getSetValue()

bool sf::ScriptInterpreter::getSetValue	(	const IdInfo *	info,
		Value *	value,
		Value::vector_type *	params,
		bool	flag_set
	)

overrideprotectedvirtual

Overridden from ScriptEngine class.

Reimplemented from sf::ScriptEngine.

◆ getState()

EState sf::ScriptInterpreter::getState ( ) const

Gets the current execution state.

◆ getStateName()

const char * sf::ScriptInterpreter::getStateName ( EState exec_state = esCurrent ) const

Gets the execution state name from the passed state or the current one on state 'esCurrent'.

◆ getVariables()

const TVector< VariableInfo * > & sf::ScriptInterpreter::getVariables ( ) const

inline

Gets the current variables declared in the script.

◆ isStepMode()

bool sf::ScriptInterpreter::isStepMode ( ) const

Get the step mode of the script.

Returns: True when the script is in step mode.

◆ linkInstruction()

virtual void sf::ScriptInterpreter::linkInstruction ( )

protectedvirtual

Links the labels of the calls in the script.

◆ setMaxLoopTime()

void sf::ScriptInterpreter::setMaxLoopTime ( unsigned long usec )

Sets the maximum loop time for this instance.

Parameters

usec	Microseconds.

◆ setOutputStream()

void sf::ScriptInterpreter::setOutputStream ( std::ostream * os )

Sets and enables debugging output stream.

◆ setScriptName()

void sf::ScriptInterpreter::setScriptName ( const std::string & name )

Sets the name given by the user.

Is used for referencing when debugging.

◆ setState()

void sf::ScriptInterpreter::setState ( EState exec_state )

protected

Sets the execution state.

Member Data Documentation

◆ _loopTimer

ElapseTimer sf::ScriptInterpreter::_loopTimer

protected

Timer to prevent endless loops.

Must be reset by functions calling external functions.

◆ _outputStream

std::ostream* sf::ScriptInterpreter::_outputStream {nullptr}

protected

Output stream to write debug information to.

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

ScriptInterpreter.h

Classes

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ ChangeListener

Member Enumeration Documentation

◆ EExecMode

◆ EExitCode

◆ EKeyWord

◆ EState

Constructor & Destructor Documentation

◆ ScriptInterpreter()

◆ ~ScriptInterpreter()

Member Function Documentation

◆ callFunction() [1/2]

◆ callFunction() [2/2]

◆ clear()

◆ compile()

◆ compileAdditionalStatement()

◆ Execute()

◆ exitFunction()

◆ flush()

◆ getChangeEmitter()

◆ getDebugText()

◆ getErrorInstructionPtr()

◆ getErrorPos()

◆ getIdentifiers()

◆ getInfo()

◆ getInfoNames()

◆ getInstructionPtr()

◆ getInstructions()

◆ getInstructionText()

◆ getLabelIp()

◆ getScriptName()

◆ getSetValue()

◆ getState()

◆ getStateName()

◆ getVariables()

◆ isStepMode()

◆ linkInstruction()

◆ setMaxLoopTime()

◆ setOutputStream()

◆ setScriptName()

◆ setState()

Member Data Documentation

◆ _loopTimer

◆ _outputStream