org.htmlunit.corejs.javascript

Class BaseFunction

java.lang.Object

org.htmlunit.corejs.javascript.SlotMapOwner

org.htmlunit.corejs.javascript.ScriptableObject

org.htmlunit.corejs.javascript.BaseFunction

All Implemented Interfaces:

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

Direct Known Subclasses:

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

public class BaseFunction
extends ScriptableObject
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.htmlunit.corejs.javascript.ScriptableObject

ScriptableObject.KeyComparator, ScriptableObject.LambdaGetterFunction, ScriptableObject.LambdaSetterFunction

Field Summary

Fields

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

Fields inherited from class org.htmlunit.corejs.javascript.ScriptableObject

CONST, DONTENUM, EMPTY, PERMANENT, READONLY, UNINITIALIZED_CONST

Fields inherited from interface org.htmlunit.corejs.javascript.Scriptable

NOT_FOUND

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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.
protected void	createProperties()
protected void	createPrototypeProperty()
protected Object	defaultGet(String name)
protected boolean	defaultHas(String name)
protected void	defaultPut(String name, Object value)
int	getArity()
String	getClassName() Return the name of the class.
Scriptable	getClassPrototype()
String	getFunctionName()
Scriptable	getHomeObject()
int	getLength()
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 boolean	includeNonStandardProps()
protected boolean	isGeneratorFunction()
void	setHomeObject(Scriptable homeObject)
void	setImmunePrototypeProperty(Object value) Make value as DontEnum, DontDelete, ReadOnly prototype property of this Function object
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(Scriptable scope)

Methods inherited from class org.htmlunit.corejs.javascript.ScriptableObject

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

Methods inherited from class org.htmlunit.corejs.javascript.SlotMapOwner

createSlotMap

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.htmlunit.corejs.javascript.Scriptable

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

Field Detail

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 Detail

BaseFunction

public BaseFunction()

BaseFunction

public BaseFunction(boolean isGenerator)

BaseFunction

public BaseFunction(Scriptable scope,
                    Scriptable prototype)

Method Detail

createProperties

protected void createProperties()

includeNonStandardProps

protected boolean includeNonStandardProps()

createPrototypeProperty

protected void createPrototypeProperty()

defaultHas

protected final boolean defaultHas(String name)

defaultGet

protected final Object defaultGet(String name)

defaultPut

protected final void defaultPut(String name,
                                Object value)

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

setImmunePrototypeProperty

public void setImmunePrototypeProperty(Object value)

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

getClassPrototype

public 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.htmlunit.corejs.javascript.Context, org.htmlunit.corejs.javascript.Scriptable, java.lang.Object[]) uses this method to to get the value for thisObj argument when invoking call(org.htmlunit.corejs.javascript.Context, org.htmlunit.corejs.javascript.Scriptable, org.htmlunit.corejs.javascript.Scriptable, java.lang.Object[]). The method is allowed to return null to indicate that call(org.htmlunit.corejs.javascript.Context, org.htmlunit.corejs.javascript.Scriptable, org.htmlunit.corejs.javascript.Scriptable, java.lang.Object[]) will create a new object itself. In this case construct(org.htmlunit.corejs.javascript.Context, org.htmlunit.corejs.javascript.Scriptable, java.lang.Object[]) will set scope and prototype on the result call(org.htmlunit.corejs.javascript.Context, org.htmlunit.corejs.javascript.Scriptable, org.htmlunit.corejs.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(Scriptable scope)

setHomeObject

public void setHomeObject(Scriptable homeObject)

getHomeObject

public Scriptable getHomeObject()