org.mozilla.javascript.ScriptableObject Maven / Gradle / Ivy
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// API class
package org.mozilla.javascript;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import org.mozilla.javascript.debug.DebuggableObject;
import org.mozilla.javascript.annotations.JSConstructor;
import org.mozilla.javascript.annotations.JSFunction;
import org.mozilla.javascript.annotations.JSGetter;
import org.mozilla.javascript.annotations.JSSetter;
import org.mozilla.javascript.annotations.JSStaticFunction;
/**
* This is the default implementation of the Scriptable interface. This
* class provides convenient default behavior that makes it easier to
* define host objects.
*
* Various properties and methods of JavaScript objects can be conveniently
* defined using methods of ScriptableObject.
*
* Classes extending ScriptableObject must define the getClassName method.
*
* @see org.mozilla.javascript.Scriptable
* @author Norris Boyd
*/
public abstract class ScriptableObject implements Scriptable,
SymbolScriptable,
Serializable,
DebuggableObject,
ConstProperties
{
static final long serialVersionUID = 2829861078851942586L;
/**
* The empty property attribute.
*
* Used by getAttributes() and setAttributes().
*
* @see org.mozilla.javascript.ScriptableObject#getAttributes(String)
* @see org.mozilla.javascript.ScriptableObject#setAttributes(String, int)
*/
public static final int EMPTY = 0x00;
/**
* Property attribute indicating assignment to this property is ignored.
*
* @see org.mozilla.javascript.ScriptableObject
* #put(String, Scriptable, Object)
* @see org.mozilla.javascript.ScriptableObject#getAttributes(String)
* @see org.mozilla.javascript.ScriptableObject#setAttributes(String, int)
*/
public static final int READONLY = 0x01;
/**
* Property attribute indicating property is not enumerated.
*
* Only enumerated properties will be returned by getIds().
*
* @see org.mozilla.javascript.ScriptableObject#getIds()
* @see org.mozilla.javascript.ScriptableObject#getAttributes(String)
* @see org.mozilla.javascript.ScriptableObject#setAttributes(String, int)
*/
public static final int DONTENUM = 0x02;
/**
* Property attribute indicating property cannot be deleted.
*
* @see org.mozilla.javascript.ScriptableObject#delete(String)
* @see org.mozilla.javascript.ScriptableObject#getAttributes(String)
* @see org.mozilla.javascript.ScriptableObject#setAttributes(String, int)
*/
public static final int PERMANENT = 0x04;
/**
* Property attribute indicating that this is a const property that has not
* been assigned yet. The first 'const' assignment to the property will
* clear this bit.
*/
public static final int UNINITIALIZED_CONST = 0x08;
public static final int CONST = PERMANENT|READONLY|UNINITIALIZED_CONST;
/**
* The prototype of this object.
*/
private Scriptable prototypeObject;
/**
* The parent scope of this object.
*/
private Scriptable parentScopeObject;
private transient Slot[] slots;
// If count >= 0, it gives number of keys or if count < 0,
// it indicates sealed object where ~count gives number of keys
private int count;
// Where external array data is stored.
private transient ExternalArrayData externalData;
// gateways into the definition-order linked list of slots
private transient Slot firstAdded;
private transient Slot lastAdded;
private volatile Map associatedValues;
private static final int SLOT_QUERY = 1;
private static final int SLOT_MODIFY = 2;
private static final int SLOT_MODIFY_CONST = 3;
private static final int SLOT_MODIFY_GETTER_SETTER = 4;
private static final int SLOT_CONVERT_ACCESSOR_TO_DATA = 5;
// initial slot array size, must be a power of 2
private static final int INITIAL_SLOT_SIZE = 4;
private boolean isExtensible = true;
private static final Method GET_ARRAY_LENGTH;
static {
try {
GET_ARRAY_LENGTH = ScriptableObject.class.getMethod("getExternalArrayLength");
} catch (NoSuchMethodException nsm) {
throw new RuntimeException(nsm);
}
}
private static class Slot implements Serializable
{
private static final long serialVersionUID = -6090581677123995491L;
Object name; // This can change due to caching
int indexOrHash;
private volatile short attributes;
transient volatile boolean wasDeleted;
volatile Object value;
transient Slot next; // next in hash table bucket
transient volatile Slot orderedNext; // next in linked list
Slot(Object name, int indexOrHash, int attributes)
{
this.name = name;
this.indexOrHash = indexOrHash;
this.attributes = (short)attributes;
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
if (name != null) {
indexOrHash = name.hashCode();
}
}
boolean setValue(Object value, Scriptable owner, Scriptable start) {
if ((attributes & READONLY) != 0) {
Context cx = Context.getContext();
if (cx.isStrictMode()) {
throw ScriptRuntime.typeError1("msg.modify.readonly", name);
}
return true;
}
if (owner == start) {
this.value = value;
return true;
} else {
return false;
}
}
Object getValue(Scriptable start) {
return value;
}
int getAttributes()
{
return attributes;
}
synchronized void setAttributes(int value)
{
checkValidAttributes(value);
attributes = (short)value;
}
void markDeleted() {
wasDeleted = true;
value = null;
name = null;
}
ScriptableObject getPropertyDescriptor(Context cx, Scriptable scope) {
return buildDataDescriptor(scope, value, attributes);
}
}
protected static ScriptableObject buildDataDescriptor(Scriptable scope,
Object value,
int attributes) {
ScriptableObject desc = new NativeObject();
ScriptRuntime.setBuiltinProtoAndParent(desc, scope, TopLevel.Builtins.Object);
desc.defineProperty("value", value, EMPTY);
desc.defineProperty("writable", (attributes & READONLY) == 0, EMPTY);
desc.defineProperty("enumerable", (attributes & DONTENUM) == 0, EMPTY);
desc.defineProperty("configurable", (attributes & PERMANENT) == 0, EMPTY);
return desc;
}
private static final class GetterSlot extends Slot
{
static final long serialVersionUID = -4900574849788797588L;
Object getter;
Object setter;
GetterSlot(Object name, int indexOrHash, int attributes)
{
super(name, indexOrHash, attributes);
}
@Override
ScriptableObject getPropertyDescriptor(Context cx, Scriptable scope) {
int attr = getAttributes();
ScriptableObject desc = new NativeObject();
ScriptRuntime.setBuiltinProtoAndParent(desc, scope, TopLevel.Builtins.Object);
desc.defineProperty("enumerable", (attr & DONTENUM) == 0, EMPTY);
desc.defineProperty("configurable", (attr & PERMANENT) == 0, EMPTY);
if (getter == null && setter == null) {
desc.defineProperty("writable", (attr & READONLY) == 0, EMPTY);
}
if (getter != null) desc.defineProperty("get", getter, EMPTY);
if (setter != null) desc.defineProperty("set", setter, EMPTY);
return desc;
}
@Override
boolean setValue(Object value, Scriptable owner, Scriptable start) {
if (setter == null) {
if (getter != null) {
Context cx = Context.getContext();
if (cx.isStrictMode() ||
// Based on TC39 ES3.1 Draft of 9-Feb-2009, 8.12.4, step 2,
// we should throw a TypeError in this case.
cx.hasFeature(Context.FEATURE_STRICT_MODE)) {
throw ScriptRuntime.typeError1("msg.set.prop.no.setter", name);
}
// Assignment to a property with only a getter defined. The
// assignment is ignored. See bug 478047.
return true;
}
} else {
Context cx = Context.getContext();
if (setter instanceof MemberBox) {
MemberBox nativeSetter = (MemberBox)setter;
Class pTypes[] = nativeSetter.argTypes;
// XXX: cache tag since it is already calculated in
// defineProperty ?
Class valueType = pTypes[pTypes.length - 1];
int tag = FunctionObject.getTypeTag(valueType);
Object actualArg = FunctionObject.convertArg(cx, start,
value, tag);
Object setterThis;
Object[] args;
if (nativeSetter.delegateTo == null) {
setterThis = start;
args = new Object[] { actualArg };
} else {
setterThis = nativeSetter.delegateTo;
args = new Object[] { start, actualArg };
}
nativeSetter.invoke(setterThis, args);
} else if (setter instanceof Function) {
Function f = (Function)setter;
f.call(cx, f.getParentScope(), start,
new Object[] { value });
}
return true;
}
return super.setValue(value, owner, start);
}
@Override
Object getValue(Scriptable start) {
if (getter != null) {
if (getter instanceof MemberBox) {
MemberBox nativeGetter = (MemberBox)getter;
Object getterThis;
Object[] args;
if (nativeGetter.delegateTo == null) {
getterThis = start;
args = ScriptRuntime.emptyArgs;
} else {
getterThis = nativeGetter.delegateTo;
args = new Object[] { start };
}
return nativeGetter.invoke(getterThis, args);
} else if (getter instanceof Function) {
Function f = (Function)getter;
Context cx = Context.getContext();
return f.call(cx, f.getParentScope(), start,
ScriptRuntime.emptyArgs);
}
}
Object val = this.value;
if (val instanceof LazilyLoadedCtor) {
LazilyLoadedCtor initializer = (LazilyLoadedCtor)val;
try {
initializer.init();
} finally {
this.value = val = initializer.getValue();
}
}
return val;
}
@Override
void markDeleted() {
super.markDeleted();
getter = null;
setter = null;
}
}
/**
* A wrapper around a slot that allows the slot to be used in a new slot
* table while keeping it functioning in its old slot table/linked list
* context. This is used when linked slots are copied to a new slot table.
* In a multi-threaded environment, these slots may still be accessed
* through their old slot table. See bug 688458.
*/
private static class RelinkedSlot extends Slot {
final Slot slot;
RelinkedSlot(Slot slot) {
super(slot.name, slot.indexOrHash, slot.attributes);
// Make sure we always wrap the actual slot, not another relinked one
this.slot = unwrapSlot(slot);
}
@Override
boolean setValue(Object value, Scriptable owner, Scriptable start) {
return slot.setValue(value, owner, start);
}
@Override
Object getValue(Scriptable start) {
return slot.getValue(start);
}
@Override
ScriptableObject getPropertyDescriptor(Context cx, Scriptable scope) {
return slot.getPropertyDescriptor(cx, scope);
}
@Override
int getAttributes() {
return slot.getAttributes();
}
@Override
void setAttributes(int value) {
slot.setAttributes(value);
}
@Override
void markDeleted() {
super.markDeleted();
slot.markDeleted();
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.writeObject(slot); // just serialize the wrapped slot
}
}
static void checkValidAttributes(int attributes)
{
final int mask = READONLY | DONTENUM | PERMANENT | UNINITIALIZED_CONST;
if ((attributes & ~mask) != 0) {
throw new IllegalArgumentException(String.valueOf(attributes));
}
}
public ScriptableObject()
{
}
public ScriptableObject(Scriptable scope, Scriptable prototype)
{
if (scope == null)
throw new IllegalArgumentException();
parentScopeObject = scope;
prototypeObject = prototype;
}
/**
* Gets the value that will be returned by calling the typeof operator on this object.
* @return default is "object" unless {@link #avoidObjectDetection()} is true in which
* case it returns "undefined"
*/
public String getTypeOf() {
return avoidObjectDetection() ? "undefined" : "object";
}
/**
* Return the name of the class.
*
* This is typically the same name as the constructor.
* Classes extending ScriptableObject must implement this abstract
* method.
*/
public abstract String getClassName();
/**
* Returns true if the named property is defined.
*
* @param name the name of the property
* @param start the object in which the lookup began
* @return true if and only if the property was found in the object
*/
public boolean has(String name, Scriptable start)
{
return null != getSlot(name, 0, SLOT_QUERY);
}
/**
* Returns true if the property index is defined.
*
* @param index the numeric index for the property
* @param start the object in which the lookup began
* @return true if and only if the property was found in the object
*/
public boolean has(int index, Scriptable start)
{
if (externalData != null) {
return (index < externalData.getArrayLength());
}
return null != getSlot(null, index, SLOT_QUERY);
}
/**
* A version of "has" that supports symbols.
*/
public boolean has(Symbol key, Scriptable start)
{
return null != getSlot(key, 0, SLOT_QUERY);
}
/**
* Returns the value of the named property or NOT_FOUND.
*
* If the property was created using defineProperty, the
* appropriate getter method is called.
*
* @param name the name of the property
* @param start the object in which the lookup began
* @return the value of the property (may be null), or NOT_FOUND
*/
public Object get(String name, Scriptable start)
{
Slot slot = getSlot(name, 0, SLOT_QUERY);
if (slot == null) {
return Scriptable.NOT_FOUND;
}
return slot.getValue(start);
}
/**
* Returns the value of the indexed property or NOT_FOUND.
*
* @param index the numeric index for the property
* @param start the object in which the lookup began
* @return the value of the property (may be null), or NOT_FOUND
*/
public Object get(int index, Scriptable start)
{
if (externalData != null) {
if (index < externalData.getArrayLength()) {
return externalData.getArrayElement(index);
}
return Scriptable.NOT_FOUND;
}
Slot slot = getSlot(null, index, SLOT_QUERY);
if (slot == null) {
return Scriptable.NOT_FOUND;
}
return slot.getValue(start);
}
/**
* Another version of Get that supports Symbol keyed properties.
*/
public Object get(Symbol key, Scriptable start)
{
Slot slot = getSlot(key, 0, SLOT_QUERY);
if (slot == null) {
return Scriptable.NOT_FOUND;
}
return slot.getValue(start);
}
/**
* Sets the value of the named property, creating it if need be.
*
* If the property was created using defineProperty, the
* appropriate setter method is called.
*
* If the property's attributes include READONLY, no action is
* taken.
* This method will actually set the property in the start
* object.
*
* @param name the name of the property
* @param start the object whose property is being set
* @param value value to set the property to
*/
public void put(String name, Scriptable start, Object value)
{
if (putImpl(name, 0, start, value))
return;
if (start == this) throw Kit.codeBug();
start.put(name, start, value);
}
/**
* Sets the value of the indexed property, creating it if need be.
*
* @param index the numeric index for the property
* @param start the object whose property is being set
* @param value value to set the property to
*/
public void put(int index, Scriptable start, Object value)
{
if (externalData != null) {
if (index < externalData.getArrayLength()) {
externalData.setArrayElement(index, value);
} else {
throw new JavaScriptException(
ScriptRuntime.newNativeError(Context.getCurrentContext(), this,
TopLevel.NativeErrors.RangeError,
new Object[] { "External array index out of bounds " }),
null, 0);
}
return;
}
if (putImpl(null, index, start, value))
return;
if (start == this) throw Kit.codeBug();
start.put(index, start, value);
}
/**
* Implementation of put required by SymbolScriptable objects.
*/
public void put(Symbol key, Scriptable start, Object value)
{
if (putImpl(key, 0, start, value))
return;
if (start == this) throw Kit.codeBug();
ensureSymbolScriptable(start).put(key, start, value);
}
/**
* Removes a named property from the object.
*
* If the property is not found, or it has the PERMANENT attribute,
* no action is taken.
*
* @param name the name of the property
*/
public void delete(String name)
{
checkNotSealed(name, 0);
removeSlot(name, 0);
}
/**
* Removes the indexed property from the object.
*
* If the property is not found, or it has the PERMANENT attribute,
* no action is taken.
*
* @param index the numeric index for the property
*/
public void delete(int index)
{
checkNotSealed(null, index);
removeSlot(null, index);
}
/**
* Removes an object like the others, but using a Symbol as the key.
*/
public void delete(Symbol key)
{
checkNotSealed(key, 0);
removeSlot(key, 0);
}
/**
* Sets the value of the named const property, creating it if need be.
*
* If the property was created using defineProperty, the
* appropriate setter method is called.
*
* If the property's attributes include READONLY, no action is
* taken.
* This method will actually set the property in the start
* object.
*
* @param name the name of the property
* @param start the object whose property is being set
* @param value value to set the property to
*/
public void putConst(String name, Scriptable start, Object value)
{
if (putConstImpl(name, 0, start, value, READONLY))
return;
if (start == this) throw Kit.codeBug();
if (start instanceof ConstProperties)
((ConstProperties)start).putConst(name, start, value);
else
start.put(name, start, value);
}
public void defineConst(String name, Scriptable start)
{
if (putConstImpl(name, 0, start, Undefined.instance, UNINITIALIZED_CONST))
return;
if (start == this) throw Kit.codeBug();
if (start instanceof ConstProperties)
((ConstProperties)start).defineConst(name, start);
}
/**
* Returns true if the named property is defined as a const on this object.
* @param name
* @return true if the named property is defined as a const, false
* otherwise.
*/
public boolean isConst(String name)
{
Slot slot = getSlot(name, 0, SLOT_QUERY);
if (slot == null) {
return false;
}
return (slot.getAttributes() & (PERMANENT|READONLY)) ==
(PERMANENT|READONLY);
}
/**
* @deprecated Use {@link #getAttributes(String name)}. The engine always
* ignored the start argument.
*/
@Deprecated
public final int getAttributes(String name, Scriptable start)
{
return getAttributes(name);
}
/**
* @deprecated Use {@link #getAttributes(int index)}. The engine always
* ignored the start argument.
*/
@Deprecated
public final int getAttributes(int index, Scriptable start)
{
return getAttributes(index);
}
/**
* @deprecated Use {@link #setAttributes(String name, int attributes)}.
* The engine always ignored the start argument.
*/
@Deprecated
public final void setAttributes(String name, Scriptable start,
int attributes)
{
setAttributes(name, attributes);
}
/**
* @deprecated Use {@link #setAttributes(int index, int attributes)}.
* The engine always ignored the start argument.
*/
@Deprecated
public void setAttributes(int index, Scriptable start,
int attributes)
{
setAttributes(index, attributes);
}
/**
* Get the attributes of a named property.
*
* The property is specified by name
* as defined for has.
*
* @param name the identifier for the property
* @return the bitset of attributes
* @exception EvaluatorException if the named property is not found
* @see org.mozilla.javascript.ScriptableObject#has(String, Scriptable)
* @see org.mozilla.javascript.ScriptableObject#READONLY
* @see org.mozilla.javascript.ScriptableObject#DONTENUM
* @see org.mozilla.javascript.ScriptableObject#PERMANENT
* @see org.mozilla.javascript.ScriptableObject#EMPTY
*/
public int getAttributes(String name)
{
return findAttributeSlot(name, 0, SLOT_QUERY).getAttributes();
}
/**
* Get the attributes of an indexed property.
*
* @param index the numeric index for the property
* @exception EvaluatorException if the named property is not found
* is not found
* @return the bitset of attributes
* @see org.mozilla.javascript.ScriptableObject#has(String, Scriptable)
* @see org.mozilla.javascript.ScriptableObject#READONLY
* @see org.mozilla.javascript.ScriptableObject#DONTENUM
* @see org.mozilla.javascript.ScriptableObject#PERMANENT
* @see org.mozilla.javascript.ScriptableObject#EMPTY
*/
public int getAttributes(int index)
{
return findAttributeSlot(null, index, SLOT_QUERY).getAttributes();
}
public int getAttributes(Symbol sym)
{
return findAttributeSlot(sym, SLOT_QUERY).getAttributes();
}
/**
* Set the attributes of a named property.
*
* The property is specified by name
* as defined for has.
*
* The possible attributes are READONLY, DONTENUM,
* and PERMANENT. Combinations of attributes
* are expressed by the bitwise OR of attributes.
* EMPTY is the state of no attributes set. Any unused
* bits are reserved for future use.
*
* @param name the name of the property
* @param attributes the bitset of attributes
* @exception EvaluatorException if the named property is not found
* @see org.mozilla.javascript.Scriptable#has(String, Scriptable)
* @see org.mozilla.javascript.ScriptableObject#READONLY
* @see org.mozilla.javascript.ScriptableObject#DONTENUM
* @see org.mozilla.javascript.ScriptableObject#PERMANENT
* @see org.mozilla.javascript.ScriptableObject#EMPTY
*/
public void setAttributes(String name, int attributes)
{
checkNotSealed(name, 0);
findAttributeSlot(name, 0, SLOT_MODIFY).setAttributes(attributes);
}
/**
* Set the attributes of an indexed property.
*
* @param index the numeric index for the property
* @param attributes the bitset of attributes
* @exception EvaluatorException if the named property is not found
* @see org.mozilla.javascript.Scriptable#has(String, Scriptable)
* @see org.mozilla.javascript.ScriptableObject#READONLY
* @see org.mozilla.javascript.ScriptableObject#DONTENUM
* @see org.mozilla.javascript.ScriptableObject#PERMANENT
* @see org.mozilla.javascript.ScriptableObject#EMPTY
*/
public void setAttributes(int index, int attributes)
{
checkNotSealed(null, index);
findAttributeSlot(null, index, SLOT_MODIFY).setAttributes(attributes);
}
/**
* Set attributes of a Symbol-keyed property.
*/
public void setAttributes(Symbol key, int attributes)
{
checkNotSealed(key, 0);
findAttributeSlot(key, SLOT_MODIFY).setAttributes(attributes);
}
/**
* XXX: write docs.
*/
public void setGetterOrSetter(String name, int index,
Callable getterOrSetter, boolean isSetter)
{
setGetterOrSetter(name, index, getterOrSetter, isSetter, false);
}
private void setGetterOrSetter(String name, int index, Callable getterOrSetter,
boolean isSetter, boolean force)
{
if (name != null && index != 0)
throw new IllegalArgumentException(name);
if (!force) {
checkNotSealed(name, index);
}
final GetterSlot gslot;
if (isExtensible()) {
gslot = (GetterSlot)getSlot(name, index, SLOT_MODIFY_GETTER_SETTER);
} else {
Slot slot = unwrapSlot(getSlot(name, index, SLOT_QUERY));
if (!(slot instanceof GetterSlot))
return;
gslot = (GetterSlot) slot;
}
if (!force) {
int attributes = gslot.getAttributes();
if ((attributes & READONLY) != 0) {
throw Context.reportRuntimeError1("msg.modify.readonly", name);
}
}
if (isSetter) {
gslot.setter = getterOrSetter;
} else {
gslot.getter = getterOrSetter;
}
gslot.value = Undefined.instance;
}
/**
* Get the getter or setter for a given property. Used by __lookupGetter__
* and __lookupSetter__.
*
* @param name Name of the object. If nonnull, index must be 0.
* @param index Index of the object. If nonzero, name must be null.
* @param isSetter If true, return the setter, otherwise return the getter.
* @exception IllegalArgumentException if both name and index are nonnull
* and nonzero respectively.
* @return Null if the property does not exist. Otherwise returns either
* the getter or the setter for the property, depending on
* the value of isSetter (may be undefined if unset).
*/
public Object getGetterOrSetter(String name, int index, boolean isSetter)
{
if (name != null && index != 0)
throw new IllegalArgumentException(name);
Slot slot = unwrapSlot(getSlot(name, index, SLOT_QUERY));
if (slot == null)
return null;
if (slot instanceof GetterSlot) {
GetterSlot gslot = (GetterSlot)slot;
Object result = isSetter ? gslot.setter : gslot.getter;
return result != null ? result : Undefined.instance;
} else
return Undefined.instance;
}
/**
* Returns whether a property is a getter or a setter
* @param name property name
* @param index property index
* @param setter true to check for a setter, false for a getter
* @return whether the property is a getter or a setter
*/
protected boolean isGetterOrSetter(String name, int index, boolean setter) {
Slot slot = unwrapSlot(getSlot(name, index, SLOT_QUERY));
if (slot instanceof GetterSlot) {
if (setter && ((GetterSlot)slot).setter != null) return true;
if (!setter && ((GetterSlot)slot).getter != null) return true;
}
return false;
}
void addLazilyInitializedValue(String name, int index,
LazilyLoadedCtor init, int attributes)
{
if (name != null && index != 0)
throw new IllegalArgumentException(name);
checkNotSealed(name, index);
GetterSlot gslot = (GetterSlot)getSlot(name, index,
SLOT_MODIFY_GETTER_SETTER);
gslot.setAttributes(attributes);
gslot.getter = null;
gslot.setter = null;
gslot.value = init;
}
/**
* Attach the specified object to this object, and delegate all indexed property lookups to it. In other words,
* if the object has 3 elements, then an attempt to look up or modify "[0]", "[1]", or "[2]" will be delegated
* to this object. Additional indexed properties outside the range specified, and additional non-indexed
* properties, may still be added. The object specified must implement the ExternalArrayData interface.
*
* @param array the List to use for delegated property access. Set this to null to revert back to regular
* property access.
* @since 1.7.6
*/
public void setExternalArrayData(ExternalArrayData array)
{
externalData = array;
if (array == null) {
delete("length");
} else {
// Define "length" to return whatever length the List gives us.
defineProperty("length", null,
GET_ARRAY_LENGTH, null, READONLY | DONTENUM);
}
}
/**
* Return the array that was previously set by the call to "setExternalArrayData".
*
* @return the array, or null if it was never set
* @since 1.7.6
*/
public ExternalArrayData getExternalArrayData()
{
return externalData;
}
/**
* This is a function used by setExternalArrayData to dynamically get the "length" property value.
*/
public Object getExternalArrayLength()
{
return (externalData == null ? 0 : externalData.getArrayLength());
}
/**
* Returns the prototype of the object.
*/
public Scriptable getPrototype()
{
return prototypeObject;
}
/**
* Sets the prototype of the object.
*/
public void setPrototype(Scriptable m)
{
prototypeObject = m;
}
/**
* Returns the parent (enclosing) scope of the object.
*/
public Scriptable getParentScope()
{
return parentScopeObject;
}
/**
* Sets the parent (enclosing) scope of the object.
*/
public void setParentScope(Scriptable m)
{
parentScopeObject = m;
}
/**
* Returns an array of ids for the properties of the object.
*
*
Any properties with the attribute DONTENUM are not listed.
*
* @return an array of java.lang.Objects with an entry for every
* listed property. Properties accessed via an integer index will
* have a corresponding
* Integer entry in the returned array. Properties accessed by
* a String will have a String entry in the returned array.
*/
public Object[] getIds() {
return getIds(false, false);
}
/**
* Returns an array of ids for the properties of the object.
*
*
All properties, even those with attribute DONTENUM, are listed.
*
* @return an array of java.lang.Objects with an entry for every
* listed property. Properties accessed via an integer index will
* have a corresponding
* Integer entry in the returned array. Properties accessed by
* a String will have a String entry in the returned array.
*/
public Object[] getAllIds() {
return getIds(true, false);
}
/**
* Implements the [[DefaultValue]] internal method.
*
*
Note that the toPrimitive conversion is a no-op for
* every type other than Object, for which [[DefaultValue]]
* is called. See ECMA 9.1.
*
* A hint of null means "no hint".
*
* @param typeHint the type hint
* @return the default value for the object
*
* See ECMA 8.6.2.6.
*/
public Object getDefaultValue(Class typeHint)
{
return getDefaultValue(this, typeHint);
}
public static Object getDefaultValue(Scriptable object, Class typeHint)
{
Context cx = null;
for (int i=0; i < 2; i++) {
boolean tryToString;
if (typeHint == ScriptRuntime.StringClass) {
tryToString = (i == 0);
} else {
tryToString = (i == 1);
}
String methodName;
Object[] args;
if (tryToString) {
methodName = "toString";
args = ScriptRuntime.emptyArgs;
} else {
methodName = "valueOf";
args = new Object[1];
String hint;
if (typeHint == null) {
hint = "undefined";
} else if (typeHint == ScriptRuntime.StringClass) {
hint = "string";
} else if (typeHint == ScriptRuntime.ScriptableClass) {
hint = "object";
} else if (typeHint == ScriptRuntime.FunctionClass) {
hint = "function";
} else if (typeHint == ScriptRuntime.BooleanClass
|| typeHint == Boolean.TYPE)
{
hint = "boolean";
} else if (typeHint == ScriptRuntime.NumberClass ||
typeHint == ScriptRuntime.ByteClass ||
typeHint == Byte.TYPE ||
typeHint == ScriptRuntime.ShortClass ||
typeHint == Short.TYPE ||
typeHint == ScriptRuntime.IntegerClass ||
typeHint == Integer.TYPE ||
typeHint == ScriptRuntime.FloatClass ||
typeHint == Float.TYPE ||
typeHint == ScriptRuntime.DoubleClass ||
typeHint == Double.TYPE)
{
hint = "number";
} else {
throw Context.reportRuntimeError1(
"msg.invalid.type", typeHint.toString());
}
args[0] = hint;
}
Object v = getProperty(object, methodName);
if (!(v instanceof Function))
continue;
Function fun = (Function) v;
if (cx == null)
cx = Context.getContext();
v = fun.call(cx, fun.getParentScope(), object, args);
if (v != null) {
if (!(v instanceof Scriptable)) {
return v;
}
if (typeHint == ScriptRuntime.ScriptableClass
|| typeHint == ScriptRuntime.FunctionClass)
{
return v;
}
if (tryToString && v instanceof Wrapper) {
// Let a wrapped java.lang.String pass for a primitive
// string.
Object u = ((Wrapper)v).unwrap();
if (u instanceof String)
return u;
}
}
}
// fall through to error
String arg = (typeHint == null) ? "undefined" : typeHint.getName();
throw ScriptRuntime.typeError1("msg.default.value", arg);
}
/**
* Implements the instanceof operator.
*
*
This operator has been proposed to ECMA.
*
* @param instance The value that appeared on the LHS of the instanceof
* operator
* @return true if "this" appears in value's prototype chain
*
*/
public boolean hasInstance(Scriptable instance) {
// Default for JS objects (other than Function) is to do prototype
// chasing. This will be overridden in NativeFunction and non-JS
// objects.
return ScriptRuntime.jsDelegatesTo(instance, this);
}
/**
* Emulate the SpiderMonkey (and Firefox) feature of allowing
* custom objects to avoid detection by normal "object detection"
* code patterns. This is used to implement document.all.
* See https://bugzilla.mozilla.org/show_bug.cgi?id=412247.
* This is an analog to JOF_DETECTING from SpiderMonkey; see
* https://bugzilla.mozilla.org/show_bug.cgi?id=248549.
* Other than this special case, embeddings should return false.
* @return true if this object should avoid object detection
* @since 1.7R1
*/
public boolean avoidObjectDetection() {
return false;
}
/**
* Custom == operator.
* Must return {@link Scriptable#NOT_FOUND} if this object does not
* have custom equality operator for the given value,
* Boolean.TRUE if this object is equivalent to value,
* Boolean.FALSE if this object is not equivalent to
* value.
*
* The default implementation returns Boolean.TRUE
* if this == value or {@link Scriptable#NOT_FOUND} otherwise.
* It indicates that by default custom equality is available only if
* value is this in which case true is returned.
*/
protected Object equivalentValues(Object value)
{
return (this == value) ? Boolean.TRUE : Scriptable.NOT_FOUND;
}
/**
* Defines JavaScript objects from a Java class that implements Scriptable.
*
* If the given class has a method
*
* static void init(Context cx, Scriptable scope, boolean sealed);
*
* or its compatibility form
*
* static void init(Scriptable scope);
*
* then it is invoked and no further initialization is done.
*
* However, if no such a method is found, then the class's constructors and
* methods are used to initialize a class in the following manner.
*
* First, the zero-parameter constructor of the class is called to
* create the prototype. If no such constructor exists,
* a {@link EvaluatorException} is thrown.
*
* Next, all methods are scanned for special prefixes that indicate that they
* have special meaning for defining JavaScript objects.
* These special prefixes are
*
* jsFunction_ for a JavaScript function
* jsStaticFunction_ for a JavaScript function that
* is a property of the constructor
* jsGet_ for a getter of a JavaScript property
* jsSet_ for a setter of a JavaScript property
* jsConstructor for a JavaScript function that
* is the constructor
*
*
* If the method's name begins with "jsFunction_", a JavaScript function
* is created with a name formed from the rest of the Java method name
* following "jsFunction_". So a Java method named "jsFunction_foo" will
* define a JavaScript method "foo". Calling this JavaScript function
* will cause the Java method to be called. The parameters of the method
* must be of number and types as defined by the FunctionObject class.
* The JavaScript function is then added as a property
* of the prototype.
*
* If the method's name begins with "jsStaticFunction_", it is handled
* similarly except that the resulting JavaScript function is added as a
* property of the constructor object. The Java method must be static.
*
* If the method's name begins with "jsGet_" or "jsSet_", the method is
* considered to define a property. Accesses to the defined property
* will result in calls to these getter and setter methods. If no
* setter is defined, the property is defined as READONLY.
*
* If the method's name is "jsConstructor", the method is
* considered to define the body of the constructor. Only one
* method of this name may be defined. You may use the varargs forms
* for constructors documented in {@link FunctionObject#FunctionObject(String, Member, Scriptable)}
*
* If no method is found that can serve as constructor, a Java
* constructor will be selected to serve as the JavaScript
* constructor in the following manner. If the class has only one
* Java constructor, that constructor is used to define
* the JavaScript constructor. If the the class has two constructors,
* one must be the zero-argument constructor (otherwise an
* {@link EvaluatorException} would have already been thrown
* when the prototype was to be created). In this case
* the Java constructor with one or more parameters will be used
* to define the JavaScript constructor. If the class has three
* or more constructors, an {@link EvaluatorException}
* will be thrown.
*
* Finally, if there is a method
*
* static void finishInit(Scriptable scope, FunctionObject constructor,
* Scriptable prototype)
*
* it will be called to finish any initialization. The scope
* argument will be passed, along with the newly created constructor and
* the newly created prototype.
*
* @param scope The scope in which to define the constructor.
* @param clazz The Java class to use to define the JavaScript objects
* and properties.
* @exception IllegalAccessException if access is not available
* to a reflected class member
* @exception InstantiationException if unable to instantiate
* the named class
* @exception InvocationTargetException if an exception is thrown
* during execution of methods of the named class
* @see org.mozilla.javascript.Function
* @see org.mozilla.javascript.FunctionObject
* @see org.mozilla.javascript.ScriptableObject#READONLY
* @see org.mozilla.javascript.ScriptableObject
* #defineProperty(String, Class, int)
*/
public static void defineClass(
Scriptable scope, Class clazz)
throws IllegalAccessException, InstantiationException,
InvocationTargetException
{
defineClass(scope, clazz, false, false);
}
/**
* Defines JavaScript objects from a Java class, optionally
* allowing sealing.
*
* Similar to defineClass(Scriptable scope, Class clazz)
* except that sealing is allowed. An object that is sealed cannot have
* properties added or removed. Note that sealing is not allowed in
* the current ECMA/ISO language specification, but is likely for
* the next version.
*
* @param scope The scope in which to define the constructor.
* @param clazz The Java class to use to define the JavaScript objects
* and properties. The class must implement Scriptable.
* @param sealed Whether or not to create sealed standard objects that
* cannot be modified.
* @exception IllegalAccessException if access is not available
* to a reflected class member
* @exception InstantiationException if unable to instantiate
* the named class
* @exception InvocationTargetException if an exception is thrown
* during execution of methods of the named class
* @since 1.4R3
*/
public static void defineClass(
Scriptable scope, Class clazz, boolean sealed)
throws IllegalAccessException, InstantiationException,
InvocationTargetException
{
defineClass(scope, clazz, sealed, false);
}
/**
* Defines JavaScript objects from a Java class, optionally
* allowing sealing and mapping of Java inheritance to JavaScript
* prototype-based inheritance.
*
* Similar to defineClass(Scriptable scope, Class clazz)
* except that sealing and inheritance mapping are allowed. An object
* that is sealed cannot have properties added or removed. Note that
* sealing is not allowed in the current ECMA/ISO language specification,
* but is likely for the next version.
*
* @param scope The scope in which to define the constructor.
* @param clazz The Java class to use to define the JavaScript objects
* and properties. The class must implement Scriptable.
* @param sealed Whether or not to create sealed standard objects that
* cannot be modified.
* @param mapInheritance Whether or not to map Java inheritance to
* JavaScript prototype-based inheritance.
* @return the class name for the prototype of the specified class
* @exception IllegalAccessException if access is not available
* to a reflected class member
* @exception InstantiationException if unable to instantiate
* the named class
* @exception InvocationTargetException if an exception is thrown
* during execution of methods of the named class
* @since 1.6R2
*/
public static String defineClass(
Scriptable scope, Class clazz, boolean sealed,
boolean mapInheritance)
throws IllegalAccessException, InstantiationException,
InvocationTargetException
{
BaseFunction ctor = buildClassCtor(scope, clazz, sealed,
mapInheritance);
if (ctor == null)
return null;
String name = ctor.getClassPrototype().getClassName();
defineProperty(scope, name, ctor, ScriptableObject.DONTENUM);
return name;
}
static BaseFunction buildClassCtor(
Scriptable scope, Class clazz,
boolean sealed,
boolean mapInheritance)
throws IllegalAccessException, InstantiationException,
InvocationTargetException
{
Method[] methods = FunctionObject.getMethodList(clazz);
for (int i=0; i < methods.length; i++) {
Method method = methods[i];
if (!method.getName().equals("init"))
continue;
Class[] parmTypes = method.getParameterTypes();
if (parmTypes.length == 3 &&
parmTypes[0] == ScriptRuntime.ContextClass &&
parmTypes[1] == ScriptRuntime.ScriptableClass &&
parmTypes[2] == Boolean.TYPE &&
Modifier.isStatic(method.getModifiers()))
{
Object args[] = { Context.getContext(), scope,
sealed ? Boolean.TRUE : Boolean.FALSE };
method.invoke(null, args);
return null;
}
if (parmTypes.length == 1 &&
parmTypes[0] == ScriptRuntime.ScriptableClass &&
Modifier.isStatic(method.getModifiers()))
{
Object args[] = { scope };
method.invoke(null, args);
return null;
}
}
// If we got here, there isn't an "init" method with the right
// parameter types.
Constructor[] ctors = clazz.getConstructors();
Constructor protoCtor = null;
for (int i=0; i < ctors.length; i++) {
if (ctors[i].getParameterTypes().length == 0) {
protoCtor = ctors[i];
break;
}
}
if (protoCtor == null) {
throw Context.reportRuntimeError1(
"msg.zero.arg.ctor", clazz.getName());
}
Scriptable proto = (Scriptable) protoCtor.newInstance(ScriptRuntime.emptyArgs);
String className = proto.getClassName();
// check for possible redefinition
Object existing = getProperty(getTopLevelScope(scope), className);
if (existing instanceof BaseFunction) {
Object existingProto = ((BaseFunction)existing).getPrototypeProperty();
if (existingProto != null && clazz.equals(existingProto.getClass())) {
return (BaseFunction)existing;
}
}
// Set the prototype's prototype, trying to map Java inheritance to JS
// prototype-based inheritance if requested to do so.
Scriptable superProto = null;
if (mapInheritance) {
Class superClass = clazz.getSuperclass();
if (ScriptRuntime.ScriptableClass.isAssignableFrom(superClass) &&
!Modifier.isAbstract(superClass.getModifiers()))
{
Class superScriptable =
extendsScriptable(superClass);
String name = ScriptableObject.defineClass(scope,
superScriptable, sealed, mapInheritance);
if (name != null) {
superProto = ScriptableObject.getClassPrototype(scope, name);
}
}
}
if (superProto == null) {
superProto = ScriptableObject.getObjectPrototype(scope);
}
proto.setPrototype(superProto);
// Find out whether there are any methods that begin with
// "js". If so, then only methods that begin with special
// prefixes will be defined as JavaScript entities.
final String functionPrefix = "jsFunction_";
final String staticFunctionPrefix = "jsStaticFunction_";
final String getterPrefix = "jsGet_";
final String setterPrefix = "jsSet_";
final String ctorName = "jsConstructor";
Member ctorMember = findAnnotatedMember(methods, JSConstructor.class);
if (ctorMember == null) {
ctorMember = findAnnotatedMember(ctors, JSConstructor.class);
}
if (ctorMember == null) {
ctorMember = FunctionObject.findSingleMethod(methods, ctorName);
}
if (ctorMember == null) {
if (ctors.length == 1) {
ctorMember = ctors[0];
} else if (ctors.length == 2) {
if (ctors[0].getParameterTypes().length == 0)
ctorMember = ctors[1];
else if (ctors[1].getParameterTypes().length == 0)
ctorMember = ctors[0];
}
if (ctorMember == null) {
throw Context.reportRuntimeError1(
"msg.ctor.multiple.parms", clazz.getName());
}
}
FunctionObject ctor = new FunctionObject(className, ctorMember, scope);
if (ctor.isVarArgsMethod()) {
throw Context.reportRuntimeError1
("msg.varargs.ctor", ctorMember.getName());
}
ctor.initAsConstructor(scope, proto);
Method finishInit = null;
HashSet staticNames = new HashSet(),
instanceNames = new HashSet();
for (Method method : methods) {
if (method == ctorMember) {
continue;
}
String name = method.getName();
if (name.equals("finishInit")) {
Class[] parmTypes = method.getParameterTypes();
if (parmTypes.length == 3 &&
parmTypes[0] == ScriptRuntime.ScriptableClass &&
parmTypes[1] == FunctionObject.class &&
parmTypes[2] == ScriptRuntime.ScriptableClass &&
Modifier.isStatic(method.getModifiers()))
{
finishInit = method;
continue;
}
}
// ignore any compiler generated methods.
if (name.indexOf('$') != -1)
continue;
if (name.equals(ctorName))
continue;
Annotation annotation = null;
String prefix = null;
if (method.isAnnotationPresent(JSFunction.class)) {
annotation = method.getAnnotation(JSFunction.class);
} else if (method.isAnnotationPresent(JSStaticFunction.class)) {
annotation = method.getAnnotation(JSStaticFunction.class);
} else if (method.isAnnotationPresent(JSGetter.class)) {
annotation = method.getAnnotation(JSGetter.class);
} else if (method.isAnnotationPresent(JSSetter.class)) {
continue;
}
if (annotation == null) {
if (name.startsWith(functionPrefix)) {
prefix = functionPrefix;
} else if (name.startsWith(staticFunctionPrefix)) {
prefix = staticFunctionPrefix;
} else if (name.startsWith(getterPrefix)) {
prefix = getterPrefix;
} else if (annotation == null) {
// note that setterPrefix is among the unhandled names here -
// we deal with that when we see the getter
continue;
}
}
boolean isStatic = annotation instanceof JSStaticFunction
|| prefix == staticFunctionPrefix;
HashSet names = isStatic ? staticNames : instanceNames;
String propName = getPropertyName(name, prefix, annotation);
if (names.contains(propName)) {
throw Context.reportRuntimeError2("duplicate.defineClass.name",
name, propName);
}
names.add(propName);
name = propName;
if (annotation instanceof JSGetter || prefix == getterPrefix) {
if (!(proto instanceof ScriptableObject)) {
throw Context.reportRuntimeError2(
"msg.extend.scriptable",
proto.getClass().toString(), name);
}
Method setter = findSetterMethod(methods, name, setterPrefix);
int attr = ScriptableObject.PERMANENT |
ScriptableObject.DONTENUM |
(setter != null ? 0
: ScriptableObject.READONLY);
((ScriptableObject) proto).defineProperty(name, null,
method, setter,
attr);
continue;
}
if (isStatic && !Modifier.isStatic(method.getModifiers())) {
throw Context.reportRuntimeError(
"jsStaticFunction must be used with static method.");
}
FunctionObject f = new FunctionObject(name, method, proto);
if (f.isVarArgsConstructor()) {
throw Context.reportRuntimeError1
("msg.varargs.fun", ctorMember.getName());
}
defineProperty(isStatic ? ctor : proto, name, f, DONTENUM);
if (sealed) {
f.sealObject();
}
}
// Call user code to complete initialization if necessary.
if (finishInit != null) {
Object[] finishArgs = { scope, ctor, proto };
finishInit.invoke(null, finishArgs);
}
// Seal the object if necessary.
if (sealed) {
ctor.sealObject();
if (proto instanceof ScriptableObject) {
((ScriptableObject) proto).sealObject();
}
}
return ctor;
}
private static Member findAnnotatedMember(AccessibleObject[] members,
Class annotation) {
for (AccessibleObject member : members) {
if (member.isAnnotationPresent(annotation)) {
return (Member) member;
}
}
return null;
}
private static Method findSetterMethod(Method[] methods,
String name,
String prefix) {
String newStyleName = "set"
+ Character.toUpperCase(name.charAt(0))
+ name.substring(1);
for (Method method : methods) {
JSSetter annotation = method.getAnnotation(JSSetter.class);
if (annotation != null) {
if (name.equals(annotation.value()) ||
("".equals(annotation.value()) && newStyleName.equals(method.getName()))) {
return method;
}
}
}
String oldStyleName = prefix + name;
for (Method method : methods) {
if (oldStyleName.equals(method.getName())) {
return method;
}
}
return null;
}
private static String getPropertyName(String methodName,
String prefix,
Annotation annotation) {
if (prefix != null) {
return methodName.substring(prefix.length());
}
String propName = null;
if (annotation instanceof JSGetter) {
propName = ((JSGetter) annotation).value();
if (propName == null || propName.length() == 0) {
if (methodName.length() > 3 && methodName.startsWith("get")) {
propName = methodName.substring(3);
if (Character.isUpperCase(propName.charAt(0))) {
if (propName.length() == 1) {
propName = propName.toLowerCase();
} else if (!Character.isUpperCase(propName.charAt(1))){
propName = Character.toLowerCase(propName.charAt(0))
+ propName.substring(1);
}
}
}
}
} else if (annotation instanceof JSFunction) {
propName = ((JSFunction) annotation).value();
} else if (annotation instanceof JSStaticFunction) {
propName = ((JSStaticFunction) annotation).value();
}
if (propName == null || propName.length() == 0) {
propName = methodName;
}
return propName;
}
@SuppressWarnings({"unchecked"})
private static Class extendsScriptable(Class c)
{
if (ScriptRuntime.ScriptableClass.isAssignableFrom(c))
return (Class) c;
return null;
}
/**
* Define a JavaScript property.
*
* Creates the property with an initial value and sets its attributes.
*
* @param propertyName the name of the property to define.
* @param value the initial value of the property
* @param attributes the attributes of the JavaScript property
* @see org.mozilla.javascript.Scriptable#put(String, Scriptable, Object)
*/
public void defineProperty(String propertyName, Object value,
int attributes)
{
checkNotSealed(propertyName, 0);
put(propertyName, this, value);
setAttributes(propertyName, attributes);
}
/**
* A version of defineProperty that uses a Symbol key.
*/
public void defineProperty(Symbol key, Object value,
int attributes)
{
checkNotSealed(key, 0);
put(key, this, value);
setAttributes(key, attributes);
}
/**
* Utility method to add properties to arbitrary Scriptable object.
* If destination is instance of ScriptableObject, calls
* defineProperty there, otherwise calls put in destination
* ignoring attributes
*/
public static void defineProperty(Scriptable destination,
String propertyName, Object value,
int attributes)
{
if (!(destination instanceof ScriptableObject)) {
destination.put(propertyName, destination, value);
return;
}
ScriptableObject so = (ScriptableObject)destination;
so.defineProperty(propertyName, value, attributes);
}
/**
* Utility method to add properties to arbitrary Scriptable object.
* If destination is instance of ScriptableObject, calls
* defineProperty there, otherwise calls put in destination
* ignoring attributes
*/
public static void defineConstProperty(Scriptable destination,
String propertyName)
{
if (destination instanceof ConstProperties) {
ConstProperties cp = (ConstProperties)destination;
cp.defineConst(propertyName, destination);
} else
defineProperty(destination, propertyName, Undefined.instance, CONST);
}
/**
* Define a JavaScript property with getter and setter side effects.
*
* If the setter is not found, the attribute READONLY is added to
* the given attributes.
*
* The getter must be a method with zero parameters, and the setter, if
* found, must be a method with one parameter.
*
* @param propertyName the name of the property to define. This name
* also affects the name of the setter and getter
* to search for. If the propertyId is "foo", then
* clazz will be searched for "getFoo"
* and "setFoo" methods.
* @param clazz the Java class to search for the getter and setter
* @param attributes the attributes of the JavaScript property
* @see org.mozilla.javascript.Scriptable#put(String, Scriptable, Object)
*/
public void defineProperty(String propertyName, Class clazz,
int attributes)
{
int length = propertyName.length();
if (length == 0) throw new IllegalArgumentException();
char[] buf = new char[3 + length];
propertyName.getChars(0, length, buf, 3);
buf[3] = Character.toUpperCase(buf[3]);
buf[0] = 'g';
buf[1] = 'e';
buf[2] = 't';
String getterName = new String(buf);
buf[0] = 's';
String setterName = new String(buf);
Method[] methods = FunctionObject.getMethodList(clazz);
Method getter = FunctionObject.findSingleMethod(methods, getterName);
Method setter = FunctionObject.findSingleMethod(methods, setterName);
if (setter == null)
attributes |= ScriptableObject.READONLY;
defineProperty(propertyName, null, getter,
setter == null ? null : setter, attributes);
}
/**
* Define a JavaScript property.
*
* Use this method only if you wish to define getters and setters for
* a given property in a ScriptableObject. To create a property without
* special getter or setter side effects, use
* defineProperty(String,int).
*
* If setter is null, the attribute READONLY is added to
* the given attributes.
*
* Several forms of getters or setters are allowed. In all cases the
* type of the value parameter can be any one of the following types:
* Object, String, boolean, Scriptable, byte, short, int, long, float,
* or double. The runtime will perform appropriate conversions based
* upon the type of the parameter (see description in FunctionObject).
* The first forms are nonstatic methods of the class referred to
* by 'this':
*
* Object getFoo();
* void setFoo(SomeType value);
* Next are static methods that may be of any class; the object whose
* property is being accessed is passed in as an extra argument:
*
* static Object getFoo(Scriptable obj);
* static void setFoo(Scriptable obj, SomeType value);
* Finally, it is possible to delegate to another object entirely using
* the delegateTo parameter. In this case the methods are
* nonstatic methods of the class delegated to, and the object whose
* property is being accessed is passed in as an extra argument:
*
* Object getFoo(Scriptable obj);
* void setFoo(Scriptable obj, SomeType value);
*
* @param propertyName the name of the property to define.
* @param delegateTo an object to call the getter and setter methods on,
* or null, depending on the form used above.
* @param getter the method to invoke to get the value of the property
* @param setter the method to invoke to set the value of the property
* @param attributes the attributes of the JavaScript property
*/
public void defineProperty(String propertyName, Object delegateTo,
Method getter, Method setter, int attributes)
{
MemberBox getterBox = null;
if (getter != null) {
getterBox = new MemberBox(getter);
boolean delegatedForm;
if (!Modifier.isStatic(getter.getModifiers())) {
delegatedForm = (delegateTo != null);
getterBox.delegateTo = delegateTo;
} else {
delegatedForm = true;
// Ignore delegateTo for static getter but store
// non-null delegateTo indicator.
getterBox.delegateTo = Void.TYPE;
}
String errorId = null;
Class[] parmTypes = getter.getParameterTypes();
if (parmTypes.length == 0) {
if (delegatedForm) {
errorId = "msg.obj.getter.parms";
}
} else if (parmTypes.length == 1) {
Object argType = parmTypes[0];
// Allow ScriptableObject for compatibility
if (!(argType == ScriptRuntime.ScriptableClass ||
argType == ScriptRuntime.ScriptableObjectClass))
{
errorId = "msg.bad.getter.parms";
} else if (!delegatedForm) {
errorId = "msg.bad.getter.parms";
}
} else {
errorId = "msg.bad.getter.parms";
}
if (errorId != null) {
throw Context.reportRuntimeError1(errorId, getter.toString());
}
}
MemberBox setterBox = null;
if (setter != null) {
if (setter.getReturnType() != Void.TYPE)
throw Context.reportRuntimeError1("msg.setter.return",
setter.toString());
setterBox = new MemberBox(setter);
boolean delegatedForm;
if (!Modifier.isStatic(setter.getModifiers())) {
delegatedForm = (delegateTo != null);
setterBox.delegateTo = delegateTo;
} else {
delegatedForm = true;
// Ignore delegateTo for static setter but store
// non-null delegateTo indicator.
setterBox.delegateTo = Void.TYPE;
}
String errorId = null;
Class[] parmTypes = setter.getParameterTypes();
if (parmTypes.length == 1) {
if (delegatedForm) {
errorId = "msg.setter2.expected";
}
} else if (parmTypes.length == 2) {
Object argType = parmTypes[0];
// Allow ScriptableObject for compatibility
if (!(argType == ScriptRuntime.ScriptableClass ||
argType == ScriptRuntime.ScriptableObjectClass))
{
errorId = "msg.setter2.parms";
} else if (!delegatedForm) {
errorId = "msg.setter1.parms";
}
} else {
errorId = "msg.setter.parms";
}
if (errorId != null) {
throw Context.reportRuntimeError1(errorId, setter.toString());
}
}
GetterSlot gslot = (GetterSlot)getSlot(propertyName, 0,
SLOT_MODIFY_GETTER_SETTER);
gslot.setAttributes(attributes);
gslot.getter = getterBox;
gslot.setter = setterBox;
}
/**
* Defines one or more properties on this object.
*
* @param cx the current Context
* @param props a map of property ids to property descriptors
*/
public void defineOwnProperties(Context cx, ScriptableObject props) {
Object[] ids = props.getIds(false, true);
ScriptableObject[] descs = new ScriptableObject[ids.length];
for (int i = 0, len = ids.length; i < len; ++i) {
Object descObj = ScriptRuntime.getObjectElem(props, ids[i], cx);
ScriptableObject desc = ensureScriptableObject(descObj);
checkPropertyDefinition(desc);
descs[i] = desc;
}
for (int i = 0, len = ids.length; i < len; ++i) {
defineOwnProperty(cx, ids[i], descs[i]);
}
}
/**
* Defines a property on an object.
*
* @param cx the current Context
* @param id the name/index of the property
* @param desc the new property descriptor, as described in 8.6.1
*/
public void defineOwnProperty(Context cx, Object id, ScriptableObject desc) {
checkPropertyDefinition(desc);
defineOwnProperty(cx, id, desc, true);
}
/**
* Defines a property on an object.
*
* Based on [[DefineOwnProperty]] from 8.12.10 of the spec.
*
* @param cx the current Context
* @param id the name/index of the property
* @param desc the new property descriptor, as described in 8.6.1
* @param checkValid whether to perform validity checks
*/
protected void defineOwnProperty(Context cx, Object id, ScriptableObject desc,
boolean checkValid) {
Slot slot = getSlot(cx, id, SLOT_QUERY);
boolean isNew = slot == null;
if (checkValid) {
ScriptableObject current = slot == null ?
null : slot.getPropertyDescriptor(cx, this);
checkPropertyChange(id, current, desc);
}
boolean isAccessor = isAccessorDescriptor(desc);
final int attributes;
if (slot == null) { // new slot
slot = getSlot(cx, id, isAccessor ? SLOT_MODIFY_GETTER_SETTER : SLOT_MODIFY);
attributes = applyDescriptorToAttributeBitset(DONTENUM|READONLY|PERMANENT, desc);
} else {
attributes = applyDescriptorToAttributeBitset(slot.getAttributes(), desc);
}
slot = unwrapSlot(slot);
if (isAccessor) {
if ( !(slot instanceof GetterSlot) ) {
slot = getSlot(cx, id, SLOT_MODIFY_GETTER_SETTER);
}
GetterSlot gslot = (GetterSlot) slot;
Object getter = getProperty(desc, "get");
if (getter != NOT_FOUND) {
gslot.getter = getter;
}
Object setter = getProperty(desc, "set");
if (setter != NOT_FOUND) {
gslot.setter = setter;
}
gslot.value = Undefined.instance;
gslot.setAttributes(attributes);
} else {
if (slot instanceof GetterSlot && isDataDescriptor(desc)) {
slot = getSlot(cx, id, SLOT_CONVERT_ACCESSOR_TO_DATA);
}
Object value = getProperty(desc, "value");
if (value != NOT_FOUND) {
slot.value = value;
} else if (isNew) {
slot.value = Undefined.instance;
}
slot.setAttributes(attributes);
}
}
protected void checkPropertyDefinition(ScriptableObject desc) {
Object getter = getProperty(desc, "get");
if (getter != NOT_FOUND && getter != Undefined.instance
&& !(getter instanceof Callable)) {
throw ScriptRuntime.notFunctionError(getter);
}
Object setter = getProperty(desc, "set");
if (setter != NOT_FOUND && setter != Undefined.instance
&& !(setter instanceof Callable)) {
throw ScriptRuntime.notFunctionError(setter);
}
if (isDataDescriptor(desc) && isAccessorDescriptor(desc)) {
throw ScriptRuntime.typeError0("msg.both.data.and.accessor.desc");
}
}
protected void checkPropertyChange(Object id, ScriptableObject current,
ScriptableObject desc) {
if (current == null) { // new property
if (!isExtensible()) throw ScriptRuntime.typeError0("msg.not.extensible");
} else {
if (isFalse(current.get("configurable", current))) {
if (isTrue(getProperty(desc, "configurable")))
throw ScriptRuntime.typeError1(
"msg.change.configurable.false.to.true", id);
if (isTrue(current.get("enumerable", current)) != isTrue(getProperty(desc, "enumerable")))
throw ScriptRuntime.typeError1(
"msg.change.enumerable.with.configurable.false", id);
boolean isData = isDataDescriptor(desc);
boolean isAccessor = isAccessorDescriptor(desc);
if (!isData && !isAccessor) {
// no further validation required for generic descriptor
} else if (isData && isDataDescriptor(current)) {
if (isFalse(current.get("writable", current))) {
if (isTrue(getProperty(desc, "writable")))
throw ScriptRuntime.typeError1(
"msg.change.writable.false.to.true.with.configurable.false", id);
if (!sameValue(getProperty(desc, "value"), current.get("value", current)))
throw ScriptRuntime.typeError1(
"msg.change.value.with.writable.false", id);
}
} else if (isAccessor && isAccessorDescriptor(current)) {
if (!sameValue(getProperty(desc, "set"), current.get("set", current)))
throw ScriptRuntime.typeError1(
"msg.change.setter.with.configurable.false", id);
if (!sameValue(getProperty(desc, "get"), current.get("get", current)))
throw ScriptRuntime.typeError1(
"msg.change.getter.with.configurable.false", id);
} else {
if (isDataDescriptor(current))
throw ScriptRuntime.typeError1(
"msg.change.property.data.to.accessor.with.configurable.false", id);
else
throw ScriptRuntime.typeError1(
"msg.change.property.accessor.to.data.with.configurable.false", id);
}
}
}
}
protected static boolean isTrue(Object value) {
return (value != NOT_FOUND) && ScriptRuntime.toBoolean(value);
}
protected static boolean isFalse(Object value) {
return !isTrue(value);
}
/**
* Implements SameValue as described in ES5 9.12, additionally checking
* if new value is defined.
* @param newValue the new value
* @param currentValue the current value
* @return true if values are the same as defined by ES5 9.12
*/
protected boolean sameValue(Object newValue, Object currentValue) {
if (newValue == NOT_FOUND) {
return true;
}
if (currentValue == NOT_FOUND) {
currentValue = Undefined.instance;
}
// Special rules for numbers: NaN is considered the same value,
// while zeroes with different signs are considered different.
if (currentValue instanceof Number && newValue instanceof Number) {
double d1 = ((Number)currentValue).doubleValue();
double d2 = ((Number)newValue).doubleValue();
if (Double.isNaN(d1) && Double.isNaN(d2)) {
return true;
}
if (d1 == 0.0 && Double.doubleToLongBits(d1) != Double.doubleToLongBits(d2)) {
return false;
}
}
return ScriptRuntime.shallowEq(currentValue, newValue);
}
protected int applyDescriptorToAttributeBitset(int attributes,
ScriptableObject desc)
{
Object enumerable = getProperty(desc, "enumerable");
if (enumerable != NOT_FOUND) {
attributes = ScriptRuntime.toBoolean(enumerable)
? attributes & ~DONTENUM : attributes | DONTENUM;
}
Object writable = getProperty(desc, "writable");
if (writable != NOT_FOUND) {
attributes = ScriptRuntime.toBoolean(writable)
? attributes & ~READONLY : attributes | READONLY;
}
Object configurable = getProperty(desc, "configurable");
if (configurable != NOT_FOUND) {
attributes = ScriptRuntime.toBoolean(configurable)
? attributes & ~PERMANENT : attributes | PERMANENT;
}
return attributes;
}
/**
* Implements IsDataDescriptor as described in ES5 8.10.2
* @param desc a property descriptor
* @return true if this is a data descriptor.
*/
protected boolean isDataDescriptor(ScriptableObject desc) {
return hasProperty(desc, "value") || hasProperty(desc, "writable");
}
/**
* Implements IsAccessorDescriptor as described in ES5 8.10.1
* @param desc a property descriptor
* @return true if this is an accessor descriptor.
*/
protected boolean isAccessorDescriptor(ScriptableObject desc) {
return hasProperty(desc, "get") || hasProperty(desc, "set");
}
/**
* Implements IsGenericDescriptor as described in ES5 8.10.3
* @param desc a property descriptor
* @return true if this is a generic descriptor.
*/
protected boolean isGenericDescriptor(ScriptableObject desc) {
return !isDataDescriptor(desc) && !isAccessorDescriptor(desc);
}
protected static Scriptable ensureScriptable(Object arg) {
if ( !(arg instanceof Scriptable) )
throw ScriptRuntime.typeError1("msg.arg.not.object", ScriptRuntime.typeof(arg));
return (Scriptable) arg;
}
protected static SymbolScriptable ensureSymbolScriptable(Object arg) {
if ( !(arg instanceof SymbolScriptable) )
throw ScriptRuntime.typeError1("msg.object.not.symbolscriptable", ScriptRuntime.typeof(arg));
return (SymbolScriptable) arg;
}
protected static ScriptableObject ensureScriptableObject(Object arg) {
if ( !(arg instanceof ScriptableObject) )
throw ScriptRuntime.typeError1("msg.arg.not.object", ScriptRuntime.typeof(arg));
return (ScriptableObject) arg;
}
/**
* Search for names in a class, adding the resulting methods
* as properties.
*
* Uses reflection to find the methods of the given names. Then
* FunctionObjects are constructed from the methods found, and
* are added to this object as properties with the given names.
*
* @param names the names of the Methods to add as function properties
* @param clazz the class to search for the Methods
* @param attributes the attributes of the new properties
* @see org.mozilla.javascript.FunctionObject
*/
public void defineFunctionProperties(String[] names, Class clazz,
int attributes)
{
Method[] methods = FunctionObject.getMethodList(clazz);
for (int i=0; i < names.length; i++) {
String name = names[i];
Method m = FunctionObject.findSingleMethod(methods, name);
if (m == null) {
throw Context.reportRuntimeError2(
"msg.method.not.found", name, clazz.getName());
}
FunctionObject f = new FunctionObject(name, m, this);
defineProperty(name, f, attributes);
}
}
/**
* Get the Object.prototype property.
* See ECMA 15.2.4.
*/
public static Scriptable getObjectPrototype(Scriptable scope) {
return TopLevel.getBuiltinPrototype(getTopLevelScope(scope),
TopLevel.Builtins.Object);
}
/**
* Get the Function.prototype property.
* See ECMA 15.3.4.
*/
public static Scriptable getFunctionPrototype(Scriptable scope) {
return TopLevel.getBuiltinPrototype(getTopLevelScope(scope),
TopLevel.Builtins.Function);
}
public static Scriptable getArrayPrototype(Scriptable scope) {
return TopLevel.getBuiltinPrototype(getTopLevelScope(scope),
TopLevel.Builtins.Array);
}
/**
* Get the prototype for the named class.
*
* For example, getClassPrototype(s, "Date") will first
* walk up the parent chain to find the outermost scope, then will
* search that scope for the Date constructor, and then will
* return Date.prototype. If any of the lookups fail, or
* the prototype is not a JavaScript object, then null will
* be returned.
*
* @param scope an object in the scope chain
* @param className the name of the constructor
* @return the prototype for the named class, or null if it
* cannot be found.
*/
public static Scriptable getClassPrototype(Scriptable scope,
String className)
{
scope = getTopLevelScope(scope);
Object ctor = getProperty(scope, className);
Object proto;
if (ctor instanceof BaseFunction) {
proto = ((BaseFunction)ctor).getPrototypeProperty();
} else if (ctor instanceof Scriptable) {
Scriptable ctorObj = (Scriptable)ctor;
proto = ctorObj.get("prototype", ctorObj);
} else {
return null;
}
if (proto instanceof Scriptable) {
return (Scriptable)proto;
}
return null;
}
/**
* Get the global scope.
*
*
Walks the parent scope chain to find an object with a null
* parent scope (the global object).
*
* @param obj a JavaScript object
* @return the corresponding global scope
*/
public static Scriptable getTopLevelScope(Scriptable obj)
{
for (;;) {
Scriptable parent = obj.getParentScope();
if (parent == null) {
return obj;
}
obj = parent;
}
}
public boolean isExtensible() {
return isExtensible;
}
public void preventExtensions() {
isExtensible = false;
}
/**
* Seal this object.
*
* It is an error to add properties to or delete properties from
* a sealed object. It is possible to change the value of an
* existing property. Once an object is sealed it may not be unsealed.
*
* @since 1.4R3
*/
public synchronized void sealObject() {
if (count >= 0) {
// Make sure all LazilyLoadedCtors are initialized before sealing.
Slot slot = firstAdded;
while (slot != null) {
Object value = slot.value;
if (value instanceof LazilyLoadedCtor) {
LazilyLoadedCtor initializer = (LazilyLoadedCtor) value;
try {
initializer.init();
} finally {
slot.value = initializer.getValue();
}
}
slot = slot.orderedNext;
}
count = ~count;
}
}
/**
* Return true if this object is sealed.
*
* @return true if sealed, false otherwise.
* @since 1.4R3
* @see #sealObject()
*/
public final boolean isSealed() {
return count < 0;
}
private void checkNotSealed(Object key, int index)
{
if (!isSealed())
return;
String str = (key != null) ? key.toString() : Integer.toString(index);
throw Context.reportRuntimeError1("msg.modify.sealed", str);
}
/**
* Gets a named property from an object or any object in its prototype chain.
*
* Searches the prototype chain for a property named name.
*
* @param obj a JavaScript object
* @param name a property name
* @return the value of a property with name name found in
* obj or any object in its prototype chain, or
* Scriptable.NOT_FOUND if not found
* @since 1.5R2
*/
public static Object getProperty(Scriptable obj, String name)
{
Scriptable start = obj;
Object result;
do {
result = obj.get(name, start);
if (result != Scriptable.NOT_FOUND)
break;
obj = obj.getPrototype();
} while (obj != null);
return result;
}
/**
* This is a version of getProperty that works with Symbols.
*/
public static Object getProperty(Scriptable obj, Symbol key)
{
Scriptable start = obj;
Object result;
do {
result = ensureSymbolScriptable(obj).get(key, start);
if (result != Scriptable.NOT_FOUND)
break;
obj = obj.getPrototype();
} while (obj != null);
return result;
}
/**
* Gets an indexed property from an object or any object in its prototype
* chain and coerces it to the requested Java type.
*
* Searches the prototype chain for a property with integral index
* index. Note that if you wish to look for properties with numerical
* but non-integral indicies, you should use getProperty(Scriptable,String) with
* the string value of the index.
*
* @param s a JavaScript object
* @param index an integral index
* @param type the required Java type of the result
* @return the value of a property with name name found in
* obj or any object in its prototype chain, or
* null if not found. Note that it does not return
* {@link Scriptable#NOT_FOUND} as it can ordinarily not be
* converted to most of the types.
* @since 1.7R3
*/
public static T getTypedProperty(Scriptable s, int index, Class type) {
Object val = getProperty(s, index);
if(val == Scriptable.NOT_FOUND) {
val = null;
}
return type.cast(Context.jsToJava(val, type));
}
/**
* Gets an indexed property from an object or any object in its prototype chain.
*
* Searches the prototype chain for a property with integral index
* index. Note that if you wish to look for properties with numerical
* but non-integral indicies, you should use getProperty(Scriptable,String) with
* the string value of the index.
*
* @param obj a JavaScript object
* @param index an integral index
* @return the value of a property with index index found in
* obj or any object in its prototype chain, or
* Scriptable.NOT_FOUND if not found
* @since 1.5R2
*/
public static Object getProperty(Scriptable obj, int index)
{
Scriptable start = obj;
Object result;
do {
result = obj.get(index, start);
if (result != Scriptable.NOT_FOUND)
break;
obj = obj.getPrototype();
} while (obj != null);
return result;
}
/**
* Gets a named property from an object or any object in its prototype chain
* and coerces it to the requested Java type.
*
* Searches the prototype chain for a property named name.
*
* @param s a JavaScript object
* @param name a property name
* @param type the required Java type of the result
* @return the value of a property with name name found in
* obj or any object in its prototype chain, or
* null if not found. Note that it does not return
* {@link Scriptable#NOT_FOUND} as it can ordinarily not be
* converted to most of the types.
* @since 1.7R3
*/
public static T getTypedProperty(Scriptable s, String name, Class type) {
Object val = getProperty(s, name);
if(val == Scriptable.NOT_FOUND) {
val = null;
}
return type.cast(Context.jsToJava(val, type));
}
/**
* Returns whether a named property is defined in an object or any object
* in its prototype chain.
*
* Searches the prototype chain for a property named name.
*
* @param obj a JavaScript object
* @param name a property name
* @return the true if property was found
* @since 1.5R2
*/
public static boolean hasProperty(Scriptable obj, String name)
{
return null != getBase(obj, name);
}
/**
* If hasProperty(obj, name) would return true, then if the property that
* was found is compatible with the new property, this method just returns.
* If the property is not compatible, then an exception is thrown.
*
* A property redefinition is incompatible if the first definition was a
* const declaration or if this one is. They are compatible only if neither
* was const.
*/
public static void redefineProperty(Scriptable obj, String name,
boolean isConst)
{
Scriptable base = getBase(obj, name);
if (base == null)
return;
if (base instanceof ConstProperties) {
ConstProperties cp = (ConstProperties)base;
if (cp.isConst(name))
throw ScriptRuntime.typeError1("msg.const.redecl", name);
}
if (isConst)
throw ScriptRuntime.typeError1("msg.var.redecl", name);
}
/**
* Returns whether an indexed property is defined in an object or any object
* in its prototype chain.
*
* Searches the prototype chain for a property with index index.
*
* @param obj a JavaScript object
* @param index a property index
* @return the true if property was found
* @since 1.5R2
*/
public static boolean hasProperty(Scriptable obj, int index)
{
return null != getBase(obj, index);
}
/**
* A version of hasProperty for properties with Symbol keys.
*/
public static boolean hasProperty(Scriptable obj, Symbol key)
{
return null != getBase(obj, key);
}
/**
* Puts a named property in an object or in an object in its prototype chain.
*
* Searches for the named property in the prototype chain. If it is found,
* the value of the property in obj is changed through a call
* to {@link Scriptable#put(String, Scriptable, Object)} on the
* prototype passing obj as the start argument.
* This allows the prototype to veto the property setting in case the
* prototype defines the property with [[ReadOnly]] attribute. If the
* property is not found, it is added in obj.
* @param obj a JavaScript object
* @param name a property name
* @param value any JavaScript value accepted by Scriptable.put
* @since 1.5R2
*/
public static void putProperty(Scriptable obj, String name, Object value)
{
Scriptable base = getBase(obj, name);
if (base == null)
base = obj;
base.put(name, obj, value);
}
/**
* This is a version of putProperty for Symbol keys.
*/
public static void putProperty(Scriptable obj, Symbol key, Object value)
{
Scriptable base = getBase(obj, key);
if (base == null)
base = obj;
ensureSymbolScriptable(base).put(key, obj, value);
}
/**
* Puts a named property in an object or in an object in its prototype chain.
*
* Searches for the named property in the prototype chain. If it is found,
* the value of the property in obj is changed through a call
* to {@link Scriptable#put(String, Scriptable, Object)} on the
* prototype passing obj as the start argument.
* This allows the prototype to veto the property setting in case the
* prototype defines the property with [[ReadOnly]] attribute. If the
* property is not found, it is added in obj.
* @param obj a JavaScript object
* @param name a property name
* @param value any JavaScript value accepted by Scriptable.put
* @since 1.5R2
*/
public static void putConstProperty(Scriptable obj, String name, Object value)
{
Scriptable base = getBase(obj, name);
if (base == null)
base = obj;
if (base instanceof ConstProperties)
((ConstProperties)base).putConst(name, obj, value);
}
/**
* Puts an indexed property in an object or in an object in its prototype chain.
*
* Searches for the indexed property in the prototype chain. If it is found,
* the value of the property in obj is changed through a call
* to {@link Scriptable#put(int, Scriptable, Object)} on the prototype
* passing obj as the start argument. This allows
* the prototype to veto the property setting in case the prototype defines
* the property with [[ReadOnly]] attribute. If the property is not found,
* it is added in obj.
* @param obj a JavaScript object
* @param index a property index
* @param value any JavaScript value accepted by Scriptable.put
* @since 1.5R2
*/
public static void putProperty(Scriptable obj, int index, Object value)
{
Scriptable base = getBase(obj, index);
if (base == null)
base = obj;
base.put(index, obj, value);
}
/**
* Removes the property from an object or its prototype chain.
*
* Searches for a property with name in obj or
* its prototype chain. If it is found, the object's delete
* method is called.
* @param obj a JavaScript object
* @param name a property name
* @return true if the property doesn't exist or was successfully removed
* @since 1.5R2
*/
public static boolean deleteProperty(Scriptable obj, String name)
{
Scriptable base = getBase(obj, name);
if (base == null)
return true;
base.delete(name);
return !base.has(name, obj);
}
/**
* Removes the property from an object or its prototype chain.
*
* Searches for a property with index in obj or
* its prototype chain. If it is found, the object's delete
* method is called.
* @param obj a JavaScript object
* @param index a property index
* @return true if the property doesn't exist or was successfully removed
* @since 1.5R2
*/
public static boolean deleteProperty(Scriptable obj, int index)
{
Scriptable base = getBase(obj, index);
if (base == null)
return true;
base.delete(index);
return !base.has(index, obj);
}
/**
* Returns an array of all ids from an object and its prototypes.
*
* @param obj a JavaScript object
* @return an array of all ids from all object in the prototype chain.
* If a given id occurs multiple times in the prototype chain,
* it will occur only once in this list.
* @since 1.5R2
*/
public static Object[] getPropertyIds(Scriptable obj)
{
if (obj == null) {
return ScriptRuntime.emptyArgs;
}
Object[] result = obj.getIds();
ObjToIntMap map = null;
for (;;) {
obj = obj.getPrototype();
if (obj == null) {
break;
}
Object[] ids = obj.getIds();
if (ids.length == 0) {
continue;
}
if (map == null) {
if (result.length == 0) {
result = ids;
continue;
}
map = new ObjToIntMap(result.length + ids.length);
for (int i = 0; i != result.length; ++i) {
map.intern(result[i]);
}
result = null; // Allow to GC the result
}
for (int i = 0; i != ids.length; ++i) {
map.intern(ids[i]);
}
}
if (map != null) {
result = map.getKeys();
}
return result;
}
/**
* Call a method of an object.
* @param obj the JavaScript object
* @param methodName the name of the function property
* @param args the arguments for the call
*
* @see Context#getCurrentContext()
*/
public static Object callMethod(Scriptable obj, String methodName,
Object[] args)
{
return callMethod(null, obj, methodName, args);
}
/**
* Call a method of an object.
* @param cx the Context object associated with the current thread.
* @param obj the JavaScript object
* @param methodName the name of the function property
* @param args the arguments for the call
*/
public static Object callMethod(Context cx, Scriptable obj,
String methodName,
Object[] args)
{
Object funObj = getProperty(obj, methodName);
if (!(funObj instanceof Function)) {
throw ScriptRuntime.notFunctionError(obj, methodName);
}
Function fun = (Function)funObj;
// XXX: What should be the scope when calling funObj?
// The following favor scope stored in the object on the assumption
// that is more useful especially under dynamic scope setup.
// An alternative is to check for dynamic scope flag
// and use ScriptableObject.getTopLevelScope(fun) if the flag is not
// set. But that require access to Context and messy code
// so for now it is not checked.
Scriptable scope = ScriptableObject.getTopLevelScope(obj);
if (cx != null) {
return fun.call(cx, scope, obj, args);
} else {
return Context.call(null, fun, scope, obj, args);
}
}
private static Scriptable getBase(Scriptable obj, String name)
{
do {
if (obj.has(name, obj))
break;
obj = obj.getPrototype();
} while(obj != null);
return obj;
}
private static Scriptable getBase(Scriptable obj, int index)
{
do {
if (obj.has(index, obj))
break;
obj = obj.getPrototype();
} while(obj != null);
return obj;
}
private static Scriptable getBase(Scriptable obj, Symbol key)
{
do {
if (ensureSymbolScriptable(obj).has(key, obj))
break;
obj = obj.getPrototype();
} while(obj != null);
return obj;
}
/**
* Get arbitrary application-specific value associated with this object.
* @param key key object to select particular value.
* @see #associateValue(Object key, Object value)
*/
public final Object getAssociatedValue(Object key)
{
Map h = associatedValues;
if (h == null)
return null;
return h.get(key);
}
/**
* Get arbitrary application-specific value associated with the top scope
* of the given scope.
* The method first calls {@link #getTopLevelScope(Scriptable scope)}
* and then searches the prototype chain of the top scope for the first
* object containing the associated value with the given key.
*
* @param scope the starting scope.
* @param key key object to select particular value.
* @see #getAssociatedValue(Object key)
*/
public static Object getTopScopeValue(Scriptable scope, Object key)
{
scope = ScriptableObject.getTopLevelScope(scope);
for (;;) {
if (scope instanceof ScriptableObject) {
ScriptableObject so = (ScriptableObject)scope;
Object value = so.getAssociatedValue(key);
if (value != null) {
return value;
}
}
scope = scope.getPrototype();
if (scope == null) {
return null;
}
}
}
/**
* Associate arbitrary application-specific value with this object.
* Value can only be associated with the given object and key only once.
* The method ignores any subsequent attempts to change the already
* associated value.
* The associated values are not serialized.
* @param key key object to select particular value.
* @param value the value to associate
* @return the passed value if the method is called first time for the
* given key or old value for any subsequent calls.
* @see #getAssociatedValue(Object key)
*/
public synchronized final Object associateValue(Object key, Object value)
{
if (value == null) throw new IllegalArgumentException();
Map h = associatedValues;
if (h == null) {
h = new HashMap();
associatedValues = h;
}
return Kit.initHash(h, key, value);
}
/**
*
* @param key
* @param index
* @param start
* @param value
* @return false if this != start and no slot was found. true if this == start
* or this != start and a READONLY slot was found.
*/
private boolean putImpl(Object key, int index, Scriptable start,
Object value)
{
// This method is very hot (basically called on each assignment)
// so we inline the extensible/sealed checks below.
if (!isExtensible) {
Context cx = Context.getContext();
if (cx.isStrictMode()) {
throw ScriptRuntime.typeError0("msg.not.extensible");
}
}
Slot slot;
if (this != start) {
slot = getSlot(key, index, SLOT_QUERY);
if (slot == null) {
return false;
}
} else if (!isExtensible) {
slot = getSlot(key, index, SLOT_QUERY);
if (slot == null) {
return true;
}
} else {
if (count < 0) checkNotSealed(key, index);
slot = getSlot(key, index, SLOT_MODIFY);
}
return slot.setValue(value, this, start);
}
/**
*
* @param name
* @param index
* @param start
* @param value
* @param constFlag EMPTY means normal put. UNINITIALIZED_CONST means
* defineConstProperty. READONLY means const initialization expression.
* @return false if this != start and no slot was found. true if this == start
* or this != start and a READONLY slot was found.
*/
private boolean putConstImpl(String name, int index, Scriptable start,
Object value, int constFlag)
{
assert (constFlag != EMPTY);
if (!isExtensible) {
Context cx = Context.getContext();
if (cx.isStrictMode()) {
throw ScriptRuntime.typeError0("msg.not.extensible");
}
}
Slot slot;
if (this != start) {
slot = getSlot(name, index, SLOT_QUERY);
if (slot == null) {
return false;
}
} else if (!isExtensible()) {
slot = getSlot(name, index, SLOT_QUERY);
if (slot == null) {
return true;
}
} else {
checkNotSealed(name, index);
// either const hoisted declaration or initialization
slot = unwrapSlot(getSlot(name, index, SLOT_MODIFY_CONST));
int attr = slot.getAttributes();
if ((attr & READONLY) == 0)
throw Context.reportRuntimeError1("msg.var.redecl", name);
if ((attr & UNINITIALIZED_CONST) != 0) {
slot.value = value;
// clear the bit on const initialization
if (constFlag != UNINITIALIZED_CONST)
slot.setAttributes(attr & ~UNINITIALIZED_CONST);
}
return true;
}
return slot.setValue(value, this, start);
}
private Slot findAttributeSlot(String name, int index, int accessType)
{
Slot slot = getSlot(name, index, accessType);
if (slot == null) {
String str = (name != null ? name : Integer.toString(index));
throw Context.reportRuntimeError1("msg.prop.not.found", str);
}
return slot;
}
private Slot findAttributeSlot(Symbol key, int accessType)
{
Slot slot = getSlot(key, 0, accessType);
if (slot == null) {
throw Context.reportRuntimeError1("msg.prop.not.found", key);
}
return slot;
}
private static Slot unwrapSlot(Slot slot) {
return (slot instanceof RelinkedSlot) ? ((RelinkedSlot)slot).slot : slot;
}
/**
* Locate the slot with given name or index. Depending on the accessType
* parameter and the current slot status, a new slot may be allocated.
*
* @param key either a String or a Symbol object that identifies the property
* @param index index or 0 if slot holds property name.
*/
private Slot getSlot(Object key, int index, int accessType)
{
// Check the hashtable without using synchronization
Slot[] slotsLocalRef = slots; // Get stable local reference
if (slotsLocalRef == null && accessType == SLOT_QUERY) {
return null;
}
int indexOrHash = (key != null ? key.hashCode() : index);
if (slotsLocalRef != null) {
Slot slot;
int slotIndex = getSlotIndex(slotsLocalRef.length, indexOrHash);
for (slot = slotsLocalRef[slotIndex];
slot != null;
slot = slot.next) {
Object skey = slot.name;
if (indexOrHash == slot.indexOrHash &&
(skey == key ||
(key != null && key.equals(skey)))) {
break;
}
}
switch (accessType) {
case SLOT_QUERY:
return slot;
case SLOT_MODIFY:
case SLOT_MODIFY_CONST:
if (slot != null)
return slot;
break;
case SLOT_MODIFY_GETTER_SETTER:
slot = unwrapSlot(slot);
if (slot instanceof GetterSlot)
return slot;
break;
case SLOT_CONVERT_ACCESSOR_TO_DATA:
slot = unwrapSlot(slot);
if ( !(slot instanceof GetterSlot) )
return slot;
break;
}
}
// A new slot has to be inserted or the old has to be replaced
// by GetterSlot. Time to synchronize.
return createSlot(key, indexOrHash, accessType);
}
private synchronized Slot createSlot(Object key, int indexOrHash, int accessType) {
Slot[] slotsLocalRef = slots;
int insertPos;
if (count == 0) {
// Always throw away old slots if any on empty insert.
slotsLocalRef = new Slot[INITIAL_SLOT_SIZE];
slots = slotsLocalRef;
insertPos = getSlotIndex(slotsLocalRef.length, indexOrHash);
} else {
int tableSize = slotsLocalRef.length;
insertPos = getSlotIndex(tableSize, indexOrHash);
Slot prev = slotsLocalRef[insertPos];
Slot slot = prev;
while (slot != null) {
if (slot.indexOrHash == indexOrHash &&
(slot.name == key ||
(key != null && key.equals(slot.name))))
{
break;
}
prev = slot;
slot = slot.next;
}
if (slot != null) {
// A slot with same name/index already exists. This means that
// a slot is being redefined from a value to a getter slot or
// vice versa, or it could be a race in application code.
// Check if we need to replace the slot depending on the
// accessType flag and return the appropriate slot instance.
Slot inner = unwrapSlot(slot);
Slot newSlot;
if (accessType == SLOT_MODIFY_GETTER_SETTER
&& !(inner instanceof GetterSlot)) {
newSlot = new GetterSlot(key, indexOrHash, inner.getAttributes());
} else if (accessType == SLOT_CONVERT_ACCESSOR_TO_DATA
&& (inner instanceof GetterSlot)) {
newSlot = new Slot(key, indexOrHash, inner.getAttributes());
} else if (accessType == SLOT_MODIFY_CONST) {
return null;
} else {
return inner;
}
newSlot.value = inner.value;
newSlot.next = slot.next;
// add new slot to linked list
if (lastAdded != null) {
lastAdded.orderedNext = newSlot;
}
if (firstAdded == null) {
firstAdded = newSlot;
}
lastAdded = newSlot;
// add new slot to hash table
if (prev == slot) {
slotsLocalRef[insertPos] = newSlot;
} else {
prev.next = newSlot;
}
// other housekeeping
slot.markDeleted();
return newSlot;
} else {
// Check if the table is not too full before inserting.
if (4 * (count + 1) > 3 * slotsLocalRef.length) {
// table size must be a power of 2, always grow by x2
slotsLocalRef = new Slot[slotsLocalRef.length * 2];
copyTable(slots, slotsLocalRef, count);
slots = slotsLocalRef;
insertPos = getSlotIndex(slotsLocalRef.length,
indexOrHash);
}
}
}
Slot newSlot = (accessType == SLOT_MODIFY_GETTER_SETTER
? new GetterSlot(key, indexOrHash, 0)
: new Slot(key, indexOrHash, 0));
if (accessType == SLOT_MODIFY_CONST)
newSlot.setAttributes(CONST);
++count;
// add new slot to linked list
if (lastAdded != null)
lastAdded.orderedNext = newSlot;
if (firstAdded == null)
firstAdded = newSlot;
lastAdded = newSlot;
// add new slot to hash table, return it
addKnownAbsentSlot(slotsLocalRef, newSlot, insertPos);
return newSlot;
}
private synchronized void removeSlot(Object key, int index) {
int indexOrHash = (key != null ? key.hashCode() : index);
Slot[] slotsLocalRef = slots;
if (count != 0) {
int tableSize = slotsLocalRef.length;
int slotIndex = getSlotIndex(tableSize, indexOrHash);
Slot prev = slotsLocalRef[slotIndex];
Slot slot = prev;
while (slot != null) {
if (slot.indexOrHash == indexOrHash &&
(slot.name == key ||
(key != null && key.equals(slot.name))))
{
break;
}
prev = slot;
slot = slot.next;
}
if (slot != null) {
// non-configurable
if ((slot.getAttributes() & PERMANENT) != 0) {
Context cx = Context.getContext();
if (cx.isStrictMode()) {
throw ScriptRuntime.typeError1("msg.delete.property.with.configurable.false", key);
}
return;
}
count--;
// remove slot from hash table
if (prev == slot) {
slotsLocalRef[slotIndex] = slot.next;
} else {
prev.next = slot.next;
}
// remove from ordered list. Previously this was done lazily in
// getIds() but delete is an infrequent operation so O(n)
// should be ok
// ordered list always uses the actual slot
Slot deleted = unwrapSlot(slot);
if (deleted == firstAdded) {
prev = null;
firstAdded = deleted.orderedNext;
} else {
prev = firstAdded;
while (prev.orderedNext != deleted) {
prev = prev.orderedNext;
}
prev.orderedNext = deleted.orderedNext;
}
if (deleted == lastAdded) {
lastAdded = prev;
}
// Mark the slot as removed.
slot.markDeleted();
}
}
}
private static int getSlotIndex(int tableSize, int indexOrHash)
{
// tableSize is a power of 2
return indexOrHash & (tableSize - 1);
}
// Must be inside synchronized (this)
private static void copyTable(Slot[] oldSlots, Slot[] newSlots, int count)
{
if (count == 0) throw Kit.codeBug();
int tableSize = newSlots.length;
int i = oldSlots.length;
for (;;) {
--i;
Slot slot = oldSlots[i];
while (slot != null) {
int insertPos = getSlotIndex(tableSize, slot.indexOrHash);
// If slot has next chain in old table use a new
// RelinkedSlot wrapper to keep old table valid
Slot insSlot = slot.next == null ? slot : new RelinkedSlot(slot);
addKnownAbsentSlot(newSlots, insSlot, insertPos);
slot = slot.next;
if (--count == 0)
return;
}
}
}
/**
* Add slot with keys that are known to absent from the table.
* This is an optimization to use when inserting into empty table,
* after table growth or during deserialization.
*/
private static void addKnownAbsentSlot(Slot[] slots, Slot slot,
int insertPos)
{
if (slots[insertPos] == null) {
slots[insertPos] = slot;
} else {
Slot prev = slots[insertPos];
Slot next = prev.next;
while (next != null) {
prev = next;
next = prev.next;
}
prev.next = slot;
}
}
Object[] getIds(boolean getNonEnumerable, boolean getSymbols) {
Slot[] s = slots;
Object[] a;
int externalLen = (externalData == null ? 0 : externalData.getArrayLength());
if (externalLen == 0) {
a = ScriptRuntime.emptyArgs;
} else {
a = new Object[externalLen];
for (int i = 0; i < externalLen; i++) {
a[i] = Integer.valueOf(i);
}
}
if (s == null) {
return a;
}
int c = externalLen;
Slot slot = firstAdded;
while (slot != null && slot.wasDeleted) {
// we used to removed deleted slots from the linked list here
// but this is now done in removeSlot(). There may still be deleted
// slots (e.g. from slot conversion) but we don't want to mess
// with the list in unsynchronized code.
slot = slot.orderedNext;
}
while (slot != null) {
if ((getNonEnumerable || (slot.getAttributes() & DONTENUM) == 0) &&
(getSymbols || !(slot.name instanceof Symbol))) {
if (c == externalLen) {
// Special handling to combine external array with additional properties
Object[] oldA = a;
a = new Object[s.length + externalLen];
if (oldA != null) {
System.arraycopy(oldA, 0, a, 0, externalLen);
}
}
a[c++] = slot.name != null
? slot.name
: Integer.valueOf(slot.indexOrHash);
}
slot = slot.orderedNext;
while (slot != null && slot.wasDeleted) {
// skip deleted slots, see comment above
slot = slot.orderedNext;
}
}
if (c == (a.length + externalLen)) {
return a;
}
Object[] result = new Object[c];
System.arraycopy(a, 0, result, 0, c);
Context cx = Context.getCurrentContext();
if ((cx != null) && cx.hasFeature(Context.FEATURE_ENUMERATE_IDS_FIRST)) {
// Move all the numeric IDs to the front in numeric order
Arrays.sort(result, KEY_COMPARATOR);
}
return result;
}
private synchronized void writeObject(ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
int objectsCount = count;
if (objectsCount < 0) {
// "this" was sealed
objectsCount = ~objectsCount;
}
if (objectsCount == 0) {
out.writeInt(0);
} else {
out.writeInt(slots.length);
Slot slot = firstAdded;
while (slot != null && slot.wasDeleted) {
// as long as we're traversing the order-added linked list,
// remove deleted slots
slot = slot.orderedNext;
}
firstAdded = slot;
while (slot != null) {
out.writeObject(slot);
Slot next = slot.orderedNext;
while (next != null && next.wasDeleted) {
// remove deleted slots
next = next.orderedNext;
}
slot.orderedNext = next;
slot = next;
}
}
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
int tableSize = in.readInt();
if (tableSize != 0) {
// If tableSize is not a power of 2 find the closest
// power of 2 >= the original size.
if ((tableSize & (tableSize - 1)) != 0) {
if (tableSize > 1 << 30)
throw new RuntimeException("Property table overflow");
int newSize = INITIAL_SLOT_SIZE;
while (newSize < tableSize)
newSize <<= 1;
tableSize = newSize;
}
slots = new Slot[tableSize];
int objectsCount = count;
if (objectsCount < 0) {
// "this" was sealed
objectsCount = ~objectsCount;
}
Slot prev = null;
for (int i=0; i != objectsCount; ++i) {
lastAdded = (Slot)in.readObject();
if (i==0) {
firstAdded = lastAdded;
} else {
prev.orderedNext = lastAdded;
}
int slotIndex = getSlotIndex(tableSize, lastAdded.indexOrHash);
addKnownAbsentSlot(slots, lastAdded, slotIndex);
prev = lastAdded;
}
}
}
protected ScriptableObject getOwnPropertyDescriptor(Context cx, Object id) {
Slot slot = getSlot(cx, id, SLOT_QUERY);
if (slot == null) return null;
Scriptable scope = getParentScope();
return slot.getPropertyDescriptor(cx, (scope == null ? this : scope));
}
protected Slot getSlot(Context cx, Object id, int accessType) {
if (id instanceof Symbol) {
return getSlot(id, 0, accessType);
}
String name = ScriptRuntime.toStringIdOrIndex(cx, id);
if (name == null) {
return getSlot(null, ScriptRuntime.lastIndexResult(cx), accessType);
} else {
return getSlot(name, 0, accessType);
}
}
// Partial implementation of java.util.Map. See NativeObject for
// a subclass that implements java.util.Map.
public int size() {
return count < 0 ? ~count : count;
}
public boolean isEmpty() {
return count == 0 || count == -1;
}
public Object get(Object key) {
Object value = null;
if (key instanceof String) {
value = get((String) key, this);
} else if (key instanceof Symbol) {
value = get((Symbol) key, this);
} else if (key instanceof Number) {
value = get(((Number) key).intValue(), this);
}
if (value == Scriptable.NOT_FOUND || value == Undefined.instance) {
return null;
} else if (value instanceof Wrapper) {
return ((Wrapper) value).unwrap();
} else {
return value;
}
}
private static final Comparator