Package org.mozilla.javascript

Class BaseFunction

java.lang.Object

org.mozilla.javascript.ScriptableObject

org.mozilla.javascript.IdScriptableObject

org.mozilla.javascript.BaseFunction

All Implemented Interfaces:

Serializable, Callable, ConstProperties, Constructable, DebuggableObject, Function, IdFunctionCall, Scriptable, SymbolScriptable

Direct Known Subclasses:

ArrowFunction, BoundFunction, FunctionObject, IdFunctionObject, LambdaFunction, NativeFunction, NativeJavaConstructor, NativeJavaMethod, Require

public class BaseFunction
extends IdScriptableObject
implements Function

The base class for Function objects. That is one of two purposes. It is also the prototype for every "function" defined except those that are used as GeneratorFunctions via the ES6 "function *" syntax.

See ECMA 15.3.

Author:

Norris Boyd

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.mozilla.javascript.ScriptableObject

ScriptableObject.KeyComparator

Field Summary

Fields

Modifier and Type	Field	Description
protected static final int	Id_arguments
protected static final int	Id_arity
protected static final int	Id_length
protected static final int	Id_name
protected static final int	Id_prototype
protected static final int	MAX_INSTANCE_ID

Fields inherited from class org.mozilla.javascript.ScriptableObject

CONST, DONTENUM, EMPTY, PERMANENT, READONLY, UNINITIALIZED_CONST

Fields inherited from interface org.mozilla.javascript.Scriptable

NOT_FOUND

Constructor Summary

Constructors

Constructor	Description
BaseFunction()
BaseFunction(boolean isGenerator)
BaseFunction(Scriptable scope, Scriptable prototype)

Method Summary

Modifier and Type	Method	Description
Object	call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args)	Should be overridden.
Scriptable	construct(Context cx, Scriptable scope, Object[] args)	Call the function as a constructor.
Scriptable	createObject(Context cx, Scriptable scope)	Creates new script object.
Object	execIdCall(IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args)	'thisObj' will be null if invoked as constructor, in which case * instance of Scriptable should be returned.
protected void	fillConstructorProperties(IdFunctionObject ctor)
protected int	findInstanceIdInfo(String s)	Map name to id of instance property.
protected int	findPrototypeId(String s)
int	getArity()
String	getClassName()	Return the name of the class.
protected Scriptable	getClassPrototype()
String	getFunctionName()
protected String	getInstanceIdName(int id)	Map id back to property name it defines.
protected Object	getInstanceIdValue(int id)	Get id value. * If id value is constant, descendant can call cacheIdValue to store * value in the permanent cache. * Default implementation creates IdFunctionObject instance for given id * and cache its value
int	getLength()
protected int	getMaxInstanceId()	Get maximum id findInstanceIdInfo can generate.
Object	getPrototypeProperty()
String	getTypeOf()	Gets the value returned by calling the typeof operator on this object.
protected boolean	hasDefaultParameters()
boolean	hasInstance(Scriptable instance)	Implements the instanceof operator for JavaScript Function objects.
protected boolean	hasPrototypeProperty()
protected void	initPrototypeId(int id)
protected boolean	isGeneratorFunction()
void	setImmunePrototypeProperty(Object value)	Make value as DontEnum, DontDelete, ReadOnly prototype property of this Function object
protected void	setInstanceIdAttributes(int id, int attr)	Update the attributes of the given instance property.
protected void	setInstanceIdValue(int id, Object value)	Set or delete id value.
protected void	setPrototypeProperty(Object prototype)
void	setPrototypePropertyAttributes(int attributes)
void	setStandardPropertyAttributes(int attributes)	Sets the attributes of the "name", "length", and "arity" properties, which differ for many native objects.
protected Object	setupDefaultPrototype()

Methods inherited from class org.mozilla.javascript.IdScriptableObject

activatePrototypeMap, addIdFunctionProperty, defaultGet, defaultHas, defaultPut, defineOwnProperty, delete, delete, ensureType, ensureType, exportAsJSClass, findInstanceIdInfo, findPrototypeId, get, get, getAttributes, getAttributes, getOwnPropertyDescriptor, has, has, hasPrototypeMap, initPrototypeConstructor, initPrototypeMethod, initPrototypeMethod, initPrototypeMethod, initPrototypeValue, initPrototypeValue, instanceIdInfo, put, put, setAttributes

Methods inherited from class org.mozilla.javascript.ScriptableObject

applyDescriptorToAttributeBitset, associateValue, avoidObjectDetection, buildDataDescriptor, callMethod, callMethod, checkPropertyChange, checkPropertyDefinition, defineClass, defineClass, defineClass, defineConst, defineConstProperty, defineFunctionProperties, defineOwnProperties, defineOwnProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, delete, deleteProperty, deleteProperty, ensureScriptable, ensureScriptableObject, ensureSymbolScriptable, equivalentValues, get, get, getAllIds, getArrayPrototype, getAssociatedValue, getAttributes, getAttributes, getAttributes, getClassPrototype, getDefaultValue, getDefaultValue, getExternalArrayData, getExternalArrayLength, getFunctionPrototype, getGeneratorFunctionPrototype, getGetterOrSetter, getGetterOrSetter, getIds, getObjectPrototype, getParentScope, getProperty, getProperty, getProperty, getPropertyIds, getPrototype, getTopLevelScope, getTopScopeValue, getTypedProperty, getTypedProperty, has, hasProperty, hasProperty, hasProperty, isAccessorDescriptor, isConst, isDataDescriptor, isEmpty, isExtensible, isFalse, isGenericDescriptor, isGetterOrSetter, isSealed, isTrue, preventExtensions, put, putConst, putConstProperty, putProperty, putProperty, putProperty, querySlot, redefineProperty, sameValue, sealObject, setAttributes, setAttributes, setAttributes, setAttributes, setCommonDescriptorProperties, setExternalArrayData, setGetterOrSetter, setParentScope, setPrototype, size

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.mozilla.javascript.Scriptable

delete, delete, get, get, getDefaultValue, getIds, getParentScope, getPrototype, has, has, put, put, setParentScope, setPrototype

Field Details

Id_length

protected static final int Id_length

See Also:

• Constant Field Values

Id_arity

protected static final int Id_arity

See Also:

• Constant Field Values

Id_name

protected static final int Id_name

See Also:

• Constant Field Values

Id_prototype

protected static final int Id_prototype

See Also:

• Constant Field Values

Id_arguments

protected static final int Id_arguments

See Also:

• Constant Field Values

MAX_INSTANCE_ID

protected static final int MAX_INSTANCE_ID

See Also:

• Constant Field Values

Constructor Details

BaseFunction

public BaseFunction()

BaseFunction

public BaseFunction(boolean isGenerator)

BaseFunction

public BaseFunction(Scriptable scope,
 Scriptable prototype)

Method Details

getClassName

public String getClassName()

Description copied from class: ScriptableObject

Return the name of the class.

This is typically the same name as the constructor. Classes extending ScriptableObject must implement this abstract method.

Specified by:

getClassName in interface Scriptable

Specified by:

getClassName in class ScriptableObject

isGeneratorFunction

protected boolean isGeneratorFunction()

hasDefaultParameters

protected boolean hasDefaultParameters()

getTypeOf

public String getTypeOf()

Gets the value returned by calling the typeof operator on this object.

Overrides:

getTypeOf in class ScriptableObject

Returns:

"function" or "undefined" if ScriptableObject.avoidObjectDetection() returns true

See Also:

• ScriptableObject.getTypeOf()

hasInstance

public boolean hasInstance(Scriptable instance)

Implements the instanceof operator for JavaScript Function objects.

foo = new Foo();
foo instanceof Foo; // true


Specified by:

hasInstance in interface Scriptable

Overrides:

hasInstance in class ScriptableObject

Parameters:

instance - The value that appeared on the LHS of the instanceof operator

Returns:

true if the "prototype" property of "this" appears in value's prototype chain

getMaxInstanceId

protected int getMaxInstanceId()

Description copied from class: IdScriptableObject

Get maximum id findInstanceIdInfo can generate.

Overrides:

getMaxInstanceId in class IdScriptableObject

findInstanceIdInfo

protected int findInstanceIdInfo(String s)

Description copied from class: IdScriptableObject

Map name to id of instance property. Should return 0 if not found or the result of IdScriptableObject.instanceIdInfo(int, int).

Overrides:

findInstanceIdInfo in class IdScriptableObject

getInstanceIdName

protected String getInstanceIdName(int id)

Description copied from class: IdScriptableObject

Map id back to property name it defines.

Overrides:

getInstanceIdName in class IdScriptableObject

getInstanceIdValue

protected Object getInstanceIdValue(int id)

Description copied from class: IdScriptableObject

Get id value. * If id value is constant, descendant can call cacheIdValue to store * value in the permanent cache. * Default implementation creates IdFunctionObject instance for given id * and cache its value

Overrides:

getInstanceIdValue in class IdScriptableObject

setInstanceIdValue

protected void setInstanceIdValue(int id,
 Object value)

Description copied from class: IdScriptableObject

Set or delete id value. If value == NOT_FOUND , the implementation should make sure that the following getInstanceIdValue return NOT_FOUND.

Overrides:

setInstanceIdValue in class IdScriptableObject

setInstanceIdAttributes

protected void setInstanceIdAttributes(int id,
 int attr)

Description copied from class: IdScriptableObject

Update the attributes of the given instance property. Classes which want to support changing property attributes via Object.defineProperty must override this method. The default implementation throws InternalError.

Overrides:

setInstanceIdAttributes in class IdScriptableObject

Parameters:

id - the instance property id

attr - the new attribute bitset

fillConstructorProperties

protected void fillConstructorProperties(IdFunctionObject ctor)

Overrides:

fillConstructorProperties in class IdScriptableObject

initPrototypeId

protected void initPrototypeId(int id)

Overrides:

initPrototypeId in class IdScriptableObject

execIdCall

public Object execIdCall(IdFunctionObject f,
 Context cx,
 Scriptable scope,
 Scriptable thisObj,
 Object[] args)

Description copied from class: IdScriptableObject

'thisObj' will be null if invoked as constructor, in which case * instance of Scriptable should be returned.

Specified by:

execIdCall in interface IdFunctionCall

Overrides:

execIdCall in class IdScriptableObject

setImmunePrototypeProperty

public void setImmunePrototypeProperty(Object value)

Make value as DontEnum, DontDelete, ReadOnly prototype property of this Function object

getClassPrototype

protected Scriptable getClassPrototype()

call

public Object call(Context cx,
 Scriptable scope,
 Scriptable thisObj,
 Object[] args)

Should be overridden.

Specified by:

call in interface Callable

Specified by:

call in interface Function

Parameters:

cx - the current Context for this thread

scope - the scope to execute the function relative to. This is set to the value returned by getParentScope() except when the function is called from a closure.

thisObj - the JavaScript this object

args - the array of arguments

Returns:

the result of the call

construct

public Scriptable construct(Context cx,
 Scriptable scope,
 Object[] args)

Description copied from interface: Function

Call the function as a constructor.

This method is invoked by the runtime in order to satisfy a use of the JavaScript new operator. This method is expected to create a new object and return it.

Specified by:

construct in interface Constructable

Specified by:

construct in interface Function

Parameters:

cx - the current Context for this thread

scope - an enclosing scope of the caller except when the function is called from a closure.

args - the array of arguments

Returns:

the allocated object

createObject

public Scriptable createObject(Context cx,
 Scriptable scope)

Creates new script object. The default implementation of construct(org.mozilla.javascript.Context, org.mozilla.javascript.Scriptable, java.lang.Object[]) uses this method to to get the value for thisObj argument when invoking call(org.mozilla.javascript.Context, org.mozilla.javascript.Scriptable, org.mozilla.javascript.Scriptable, java.lang.Object[]). The method is allowed to return null to indicate that call(org.mozilla.javascript.Context, org.mozilla.javascript.Scriptable, org.mozilla.javascript.Scriptable, java.lang.Object[]) will create a new object itself. In this case construct(org.mozilla.javascript.Context, org.mozilla.javascript.Scriptable, java.lang.Object[]) will set scope and prototype on the result call(org.mozilla.javascript.Context, org.mozilla.javascript.Scriptable, org.mozilla.javascript.Scriptable, java.lang.Object[]) unless they are already set.

getArity

public int getArity()

getLength

public int getLength()

getFunctionName

public String getFunctionName()

setStandardPropertyAttributes

public void setStandardPropertyAttributes(int attributes)

Sets the attributes of the "name", "length", and "arity" properties, which differ for many native objects.

setPrototypePropertyAttributes

public void setPrototypePropertyAttributes(int attributes)

hasPrototypeProperty

protected boolean hasPrototypeProperty()

getPrototypeProperty

public Object getPrototypeProperty()

setPrototypeProperty

protected void setPrototypeProperty(Object prototype)

setupDefaultPrototype

protected Object setupDefaultPrototype()

findPrototypeId

protected int findPrototypeId(String s)

Overrides:

findPrototypeId in class IdScriptableObject