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