org.mozilla.javascript.Arguments Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of js Show documentation
Show all versions of js Show documentation
Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
The newest version!
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Norris Boyd
* Igor Bukanov
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript;
/**
* This class implements the "arguments" object.
*
* See ECMA 10.1.8
*
* @see org.mozilla.javascript.NativeCall
* @author Norris Boyd
*/
final class Arguments extends IdScriptableObject
{
static final long serialVersionUID = 4275508002492040609L;
public Arguments(NativeCall activation)
{
this.activation = activation;
Scriptable parent = activation.getParentScope();
setParentScope(parent);
setPrototype(ScriptableObject.getObjectPrototype(parent));
args = activation.originalArgs;
lengthObj = new Integer(args.length);
NativeFunction f = activation.function;
calleeObj = f;
int version = f.getLanguageVersion();
if (version <= Context.VERSION_1_3
&& version != Context.VERSION_DEFAULT)
{
callerObj = null;
} else {
callerObj = NOT_FOUND;
}
}
@Override
public String getClassName()
{
return "Object";
}
@Override
public boolean has(int index, Scriptable start)
{
if (0 <= index && index < args.length) {
if (args[index] != NOT_FOUND) {
return true;
}
}
return super.has(index, start);
}
@Override
public Object get(int index, Scriptable start)
{
if (0 <= index && index < args.length) {
Object value = args[index];
if (value != NOT_FOUND) {
if (sharedWithActivation(index)) {
NativeFunction f = activation.function;
String argName = f.getParamOrVarName(index);
value = activation.get(argName, activation);
if (value == NOT_FOUND) Kit.codeBug();
}
return value;
}
}
return super.get(index, start);
}
private boolean sharedWithActivation(int index)
{
NativeFunction f = activation.function;
int definedCount = f.getParamCount();
if (index < definedCount) {
// Check if argument is not hidden by later argument with the same
// name as hidden arguments are not shared with activation
if (index < definedCount - 1) {
String argName = f.getParamOrVarName(index);
for (int i = index + 1; i < definedCount; i++) {
if (argName.equals(f.getParamOrVarName(i))) {
return false;
}
}
}
return true;
}
return false;
}
@Override
public void put(int index, Scriptable start, Object value)
{
if (0 <= index && index < args.length) {
if (args[index] != NOT_FOUND) {
if (sharedWithActivation(index)) {
String argName;
argName = activation.function.getParamOrVarName(index);
activation.put(argName, activation, value);
return;
}
synchronized (this) {
if (args[index] != NOT_FOUND) {
if (args == activation.originalArgs) {
args = args.clone();
}
args[index] = value;
return;
}
}
}
}
super.put(index, start, value);
}
@Override
public void delete(int index)
{
if (0 <= index && index < args.length) {
synchronized (this) {
if (args[index] != NOT_FOUND) {
if (args == activation.originalArgs) {
args = args.clone();
}
args[index] = NOT_FOUND;
return;
}
}
}
super.delete(index);
}
// #string_id_map#
private static final int
Id_callee = 1,
Id_length = 2,
Id_caller = 3,
MAX_INSTANCE_ID = 3;
@Override
protected int getMaxInstanceId()
{
return MAX_INSTANCE_ID;
}
@Override
protected int findInstanceIdInfo(String s)
{
int id;
// #generated# Last update: 2007-05-09 08:15:04 EDT
L0: { id = 0; String X = null; int c;
if (s.length()==6) {
c=s.charAt(5);
if (c=='e') { X="callee";id=Id_callee; }
else if (c=='h') { X="length";id=Id_length; }
else if (c=='r') { X="caller";id=Id_caller; }
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
if (id == 0) return super.findInstanceIdInfo(s);
int attr;
switch (id) {
case Id_callee:
case Id_caller:
case Id_length:
attr = DONTENUM;
break;
default: throw new IllegalStateException();
}
return instanceIdInfo(attr, id);
}
// #/string_id_map#
@Override
protected String getInstanceIdName(int id)
{
switch (id) {
case Id_callee: return "callee";
case Id_length: return "length";
case Id_caller: return "caller";
}
return null;
}
@Override
protected Object getInstanceIdValue(int id)
{
switch (id) {
case Id_callee: return calleeObj;
case Id_length: return lengthObj;
case Id_caller: {
Object value = callerObj;
if (value == UniqueTag.NULL_VALUE) { value = null; }
else if (value == null) {
NativeCall caller = activation.parentActivationCall;
if (caller != null) {
value = caller.get("arguments", caller);
}
}
return value;
}
}
return super.getInstanceIdValue(id);
}
@Override
protected void setInstanceIdValue(int id, Object value)
{
switch (id) {
case Id_callee: calleeObj = value; return;
case Id_length: lengthObj = value; return;
case Id_caller:
callerObj = (value != null) ? value : UniqueTag.NULL_VALUE;
return;
}
super.setInstanceIdValue(id, value);
}
@Override
Object[] getIds(boolean getAll)
{
Object[] ids = super.getIds(getAll);
if (getAll && args.length != 0) {
boolean[] present = null;
int extraCount = args.length;
for (int i = 0; i != ids.length; ++i) {
Object id = ids[i];
if (id instanceof Integer) {
int index = ((Integer)id).intValue();
if (0 <= index && index < args.length) {
if (present == null) {
present = new boolean[args.length];
}
if (!present[index]) {
present[index] = true;
extraCount--;
}
}
}
}
if (extraCount != 0) {
Object[] tmp = new Object[extraCount + ids.length];
System.arraycopy(ids, 0, tmp, extraCount, ids.length);
ids = tmp;
int offset = 0;
for (int i = 0; i != args.length; ++i) {
if (present == null || !present[i]) {
ids[offset] = new Integer(i);
++offset;
}
}
if (offset != extraCount) Kit.codeBug();
}
}
return ids;
}
// Fields to hold caller, callee and length properties,
// where NOT_FOUND value tags deleted properties.
// In addition if callerObj == NULL_VALUE, it tags null for scripts, as
// initial callerObj == null means access to caller arguments available
// only in JS <= 1.3 scripts
private Object callerObj;
private Object calleeObj;
private Object lengthObj;
private NativeCall activation;
// Initially args holds activation.getOriginalArgs(), but any modification
// of its elements triggers creation of a copy. If its element holds NOT_FOUND,
// it indicates deleted index, in which case super class is queried.
private Object[] args;
}