/* -*- 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
* Mike McCabe
* 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;
import java.util.Arrays;
/**
* This class implements the Array native object.
* @author Norris Boyd
* @author Mike McCabe
*/
public class NativeArray extends IdScriptableObject
{
static final long serialVersionUID = 7331366857676127338L;
/*
* Optimization possibilities and open issues:
* - Long vs. double schizophrenia. I suspect it might be better
* to use double throughout.
*
* - Functions that need a new Array call "new Array" in the
* current scope rather than using a hardwired constructor;
* "Array" could be redefined. It turns out that js calls the
* equivalent of "new Array" in the current scope, except that it
* always gets at least an object back, even when Array == null.
*/
private static final Object ARRAY_TAG = new Object();
private static final Integer NEGATIVE_ONE = new Integer(-1);
static void init(Scriptable scope, boolean sealed)
{
NativeArray obj = new NativeArray(0);
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
static int getMaximumInitialCapacity() {
return maximumInitialCapacity;
}
static void setMaximumInitialCapacity(int maximumInitialCapacity) {
NativeArray.maximumInitialCapacity = maximumInitialCapacity;
}
public NativeArray(long lengthArg)
{
denseOnly = lengthArg <= maximumInitialCapacity;
if (denseOnly) {
int intLength = (int) lengthArg;
if (intLength < DEFAULT_INITIAL_CAPACITY)
intLength = DEFAULT_INITIAL_CAPACITY;
dense = new Object[intLength];
Arrays.fill(dense, Scriptable.NOT_FOUND);
}
length = lengthArg;
}
public NativeArray(Object[] array)
{
denseOnly = true;
dense = array;
length = array.length;
}
public String getClassName()
{
return "Array";
}
private static final int
Id_length = 1,
MAX_INSTANCE_ID = 1;
protected int getMaxInstanceId()
{
return MAX_INSTANCE_ID;
}
protected int findInstanceIdInfo(String s)
{
if (s.equals("length")) {
return instanceIdInfo(DONTENUM | PERMANENT, Id_length);
}
return super.findInstanceIdInfo(s);
}
protected String getInstanceIdName(int id)
{
if (id == Id_length) { return "length"; }
return super.getInstanceIdName(id);
}
protected Object getInstanceIdValue(int id)
{
if (id == Id_length) {
return ScriptRuntime.wrapNumber(length);
}
return super.getInstanceIdValue(id);
}
protected void setInstanceIdValue(int id, Object value)
{
if (id == Id_length) {
setLength(value); return;
}
super.setInstanceIdValue(id, value);
}
protected void fillConstructorProperties(IdFunctionObject ctor)
{
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_join,
"join", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_reverse,
"reverse", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_sort,
"sort", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_push,
"push", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_pop,
"pop", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_shift,
"shift", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_unshift,
"unshift", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_splice,
"splice", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_concat,
"concat", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_slice,
"slice", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_indexOf,
"indexOf", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_lastIndexOf,
"lastIndexOf", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_every,
"every", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_filter,
"filter", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_forEach,
"forEach", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_map,
"map", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_some,
"some", 2);
super.fillConstructorProperties(ctor);
}
protected void initPrototypeId(int id)
{
String s;
int arity;
switch (id) {
case Id_constructor: arity=1; s="constructor"; break;
case Id_toString: arity=0; s="toString"; break;
case Id_toLocaleString: arity=1; s="toLocaleString"; break;
case Id_toSource: arity=0; s="toSource"; break;
case Id_join: arity=1; s="join"; break;
case Id_reverse: arity=0; s="reverse"; break;
case Id_sort: arity=1; s="sort"; break;
case Id_push: arity=1; s="push"; break;
case Id_pop: arity=1; s="pop"; break;
case Id_shift: arity=1; s="shift"; break;
case Id_unshift: arity=1; s="unshift"; break;
case Id_splice: arity=1; s="splice"; break;
case Id_concat: arity=1; s="concat"; break;
case Id_slice: arity=1; s="slice"; break;
case Id_indexOf: arity=1; s="indexOf"; break;
case Id_lastIndexOf: arity=1; s="lastIndexOf"; break;
case Id_every: arity=1; s="every"; break;
case Id_filter: arity=1; s="filter"; break;
case Id_forEach: arity=1; s="forEach"; break;
case Id_map: arity=1; s="map"; break;
case Id_some: arity=1; s="some"; break;
default: throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(ARRAY_TAG, id, s, arity);
}
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (!f.hasTag(ARRAY_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
again:
for (;;) {
switch (id) {
case ConstructorId_join:
case ConstructorId_reverse:
case ConstructorId_sort:
case ConstructorId_push:
case ConstructorId_pop:
case ConstructorId_shift:
case ConstructorId_unshift:
case ConstructorId_splice:
case ConstructorId_concat:
case ConstructorId_slice:
case ConstructorId_indexOf:
case ConstructorId_lastIndexOf:
case ConstructorId_every:
case ConstructorId_filter:
case ConstructorId_forEach:
case ConstructorId_map:
case ConstructorId_some: {
thisObj = ScriptRuntime.toObject(scope, args[0]);
Object[] newArgs = new Object[args.length-1];
for (int i=0; i < newArgs.length; i++)
newArgs[i] = args[i+1];
args = newArgs;
id = -id;
continue again;
}
case Id_constructor: {
boolean inNewExpr = (thisObj == null);
if (!inNewExpr) {
// IdFunctionObject.construct will set up parent, proto
return f.construct(cx, scope, args);
}
return jsConstructor(cx, scope, args);
}
case Id_toString:
return toStringHelper(cx, scope, thisObj,
cx.hasFeature(Context.FEATURE_TO_STRING_AS_SOURCE), false);
case Id_toLocaleString:
return toStringHelper(cx, scope, thisObj, false, true);
case Id_toSource:
return toStringHelper(cx, scope, thisObj, true, false);
case Id_join:
return js_join(cx, thisObj, args);
case Id_reverse:
return js_reverse(cx, thisObj, args);
case Id_sort:
return js_sort(cx, scope, thisObj, args);
case Id_push:
return js_push(cx, thisObj, args);
case Id_pop:
return js_pop(cx, thisObj, args);
case Id_shift:
return js_shift(cx, thisObj, args);
case Id_unshift:
return js_unshift(cx, thisObj, args);
case Id_splice:
return js_splice(cx, scope, thisObj, args);
case Id_concat:
return js_concat(cx, scope, thisObj, args);
case Id_slice:
return js_slice(cx, thisObj, args);
case Id_indexOf:
return indexOfHelper(cx, thisObj, args, false);
case Id_lastIndexOf:
return indexOfHelper(cx, thisObj, args, true);
case Id_every:
case Id_filter:
case Id_forEach:
case Id_map:
case Id_some:
return iterativeMethod(cx, id, scope, thisObj, args);
}
throw new IllegalArgumentException(String.valueOf(id));
}
}
public Object get(int index, Scriptable start)
{
if (!denseOnly && isGetterOrSetter(null, index, false))
return super.get(index, start);
if (dense != null && 0 <= index && index < dense.length)
return dense[index];
return super.get(index, start);
}
public boolean has(int index, Scriptable start)
{
if (!denseOnly && isGetterOrSetter(null, index, false))
return super.has(index, start);
if (dense != null && 0 <= index && index < dense.length)
return dense[index] != NOT_FOUND;
return super.has(index, start);
}
// if id is an array index (ECMA 15.4.0), return the number,
// otherwise return -1L
private static long toArrayIndex(String id)
{
double d = ScriptRuntime.toNumber(id);
if (d == d) {
long index = ScriptRuntime.toUint32(d);
if (index == d && index != 4294967295L) {
// Assume that ScriptRuntime.toString(index) is the same
// as java.lang.Long.toString(index) for long
if (Long.toString(index).equals(id)) {
return index;
}
}
}
return -1;
}
public void put(String id, Scriptable start, Object value)
{
super.put(id, start, value);
if (start == this) {
// If the object is sealed, super will throw exception
long index = toArrayIndex(id);
if (index >= length) {
length = index + 1;
denseOnly = false;
}
}
}
private boolean ensureCapacity(int capacity)
{
if (capacity > dense.length) {
if (capacity > MAX_PRE_GROW_SIZE) {
denseOnly = false;
return false;
}
capacity = Math.max(capacity, (int)(dense.length * GROW_FACTOR));
Object[] newDense = new Object[capacity];
System.arraycopy(dense, 0, newDense, 0, dense.length);
Arrays.fill(newDense, dense.length, newDense.length,
Scriptable.NOT_FOUND);
dense = newDense;
}
return true;
}
public void put(int index, Scriptable start, Object value)
{
if (start == this && !isSealed() && dense != null && 0 <= index &&
(denseOnly || !isGetterOrSetter(null, index, true)))
{
if (index < dense.length) {
dense[index] = value;
if (this.length <= index)
this.length = (long)index + 1;
return;
} else if (denseOnly && index < dense.length * GROW_FACTOR &&
ensureCapacity(index+1))
{
dense[index] = value;
this.length = (long)index + 1;
return;
} else {
denseOnly = false;
}
}
super.put(index, start, value);
if (start == this) {
// only set the array length if given an array index (ECMA 15.4.0)
if (this.length <= index) {
// avoid overflowing index!
this.length = (long)index + 1;
}
}
}
public void delete(int index)
{
if (dense != null && 0 <= index && index < dense.length &&
!isSealed() && (denseOnly || !isGetterOrSetter(null, index, true)))
{
dense[index] = NOT_FOUND;
} else {
super.delete(index);
}
}
public Object[] getIds()
{
Object[] superIds = super.getIds();
if (dense == null) { return superIds; }
int N = dense.length;
long currentLength = length;
if (N > currentLength) {
N = (int)currentLength;
}
if (N == 0) { return superIds; }
int superLength = superIds.length;
Object[] ids = new Object[N + superLength];
int presentCount = 0;
for (int i = 0; i != N; ++i) {
// Replace existing elements by their indexes
if (dense[i] != NOT_FOUND) {
ids[presentCount] = new Integer(i);
++presentCount;
}
}
if (presentCount != N) {
// dense contains deleted elems, need to shrink the result
Object[] tmp = new Object[presentCount + superLength];
System.arraycopy(ids, 0, tmp, 0, presentCount);
ids = tmp;
}
System.arraycopy(superIds, 0, ids, presentCount, superLength);
return ids;
}
public Object getDefaultValue(Class hint)
{
if (hint == ScriptRuntime.NumberClass) {
Context cx = Context.getContext();
if (cx.getLanguageVersion() == Context.VERSION_1_2)
return new Long(length);
}
return super.getDefaultValue(hint);
}
/**
* See ECMA 15.4.1,2
*/
private static Object jsConstructor(Context cx, Scriptable scope,
Object[] args)
{
if (args.length == 0)
return new NativeArray(0);
// Only use 1 arg as first element for version 1.2; for
// any other version (including 1.3) follow ECMA and use it as
// a length.
if (cx.getLanguageVersion() == Context.VERSION_1_2) {
return new NativeArray(args);
} else {
Object arg0 = args[0];
if (args.length > 1 || !(arg0 instanceof Number)) {
return new NativeArray(args);
} else {
long len = ScriptRuntime.toUint32(arg0);
if (len != ((Number)arg0).doubleValue())
throw Context.reportRuntimeError0("msg.arraylength.bad");
return new NativeArray(len);
}
}
}
public long getLength() {
return length;
}
/** @deprecated Use {@link #getLength()} instead. */
public long jsGet_length() {
return getLength();
}
/**
* Change the value of the internal flag that determines whether all
* storage is handed by a dense backing array rather than an associative
* store.
* @param denseOnly new value for denseOnly flag
* @throws IllegalArgumentException if an attempt is made to enable
* denseOnly after it was disabled; NativeArray code is not written
* to handle switching back to a dense representation
*/
void setDenseOnly(boolean denseOnly) {
if (denseOnly && !this.denseOnly)
throw new IllegalArgumentException();
this.denseOnly = denseOnly;
}
private void setLength(Object val) {
/* XXX do we satisfy this?
* 15.4.5.1 [[Put]](P, V):
* 1. Call the [[CanPut]] method of A with name P.
* 2. If Result(1) is false, return.
* ?
*/
double d = ScriptRuntime.toNumber(val);
long longVal = ScriptRuntime.toUint32(d);
if (longVal != d)
throw Context.reportRuntimeError0("msg.arraylength.bad");
if (denseOnly) {
if (longVal < length) {
// downcast okay because denseOnly
Arrays.fill(dense, (int) longVal, dense.length, NOT_FOUND);
length = longVal;
return;
} else if (longVal < MAX_PRE_GROW_SIZE &&
longVal < (length * GROW_FACTOR) &&
ensureCapacity((int)longVal))
{
length = longVal;
return;
} else {
denseOnly = false;
}
}
if (longVal < length) {
// remove all properties between longVal and length
if (length - longVal > 0x1000) {
// assume that the representation is sparse
Object[] e = getIds(); // will only find in object itself
for (int i=0; i < e.length; i++) {
Object id = e[i];
if (id instanceof String) {
// > MAXINT will appear as string
String strId = (String)id;
long index = toArrayIndex(strId);
if (index >= longVal)
delete(strId);
} else {
int index = ((Integer)id).intValue();
if (index >= longVal)
delete(index);
}
}
} else {
// assume a dense representation
for (long i = longVal; i < length; i++) {
deleteElem(this, i);
}
}
}
length = longVal;
}
/* Support for generic Array-ish objects. Most of the Array
* functions try to be generic; anything that has a length
* property is assumed to be an array.
* getLengthProperty returns 0 if obj does not have the length property
* or its value is not convertible to a number.
*/
static long getLengthProperty(Context cx, Scriptable obj) {
// These will both give numeric lengths within Uint32 range.
if (obj instanceof NativeString) {
return ((NativeString)obj).getLength();
} else if (obj instanceof NativeArray) {
return ((NativeArray)obj).getLength();
}
return ScriptRuntime.toUint32(
ScriptRuntime.getObjectProp(obj, "length", cx));
}
private static Object setLengthProperty(Context cx, Scriptable target,
long length)
{
return ScriptRuntime.setObjectProp(
target, "length", ScriptRuntime.wrapNumber(length), cx);
}
/* Utility functions to encapsulate index > Integer.MAX_VALUE
* handling. Also avoids unnecessary object creation that would
* be necessary to use the general ScriptRuntime.get/setElem
* functions... though this is probably premature optimization.
*/
private static void deleteElem(Scriptable target, long index) {
int i = (int)index;
if (i == index) { target.delete(i); }
else { target.delete(Long.toString(index)); }
}
private static Object getElem(Context cx, Scriptable target, long index)
{
if (index > Integer.MAX_VALUE) {
String id = Long.toString(index);
return ScriptRuntime.getObjectProp(target, id, cx);
} else {
return ScriptRuntime.getObjectIndex(target, (int)index, cx);
}
}
private static void setElem(Context cx, Scriptable target, long index,
Object value)
{
if (index > Integer.MAX_VALUE) {
String id = Long.toString(index);
ScriptRuntime.setObjectProp(target, id, value, cx);
} else {
ScriptRuntime.setObjectIndex(target, (int)index, value, cx);
}
}
private static String toStringHelper(Context cx, Scriptable scope,
Scriptable thisObj,
boolean toSource, boolean toLocale)
{
/* It's probably redundant to handle long lengths in this
* function; StringBuffers are limited to 2^31 in java.
*/
long length = getLengthProperty(cx, thisObj);
StringBuffer result = new StringBuffer(256);
// whether to return '4,unquoted,5' or '[4, "quoted", 5]'
String separator;
if (toSource) {
result.append('[');
separator = ", ";
} else {
separator = ",";
}
boolean haslast = false;
long i = 0;
boolean toplevel, iterating;
if (cx.iterating == null) {
toplevel = true;
iterating = false;
cx.iterating = new ObjToIntMap(31);
} else {
toplevel = false;
iterating = cx.iterating.has(thisObj);
}
// Make sure cx.iterating is set to null when done
// so we don't leak memory
try {
if (!iterating) {
cx.iterating.put(thisObj, 0); // stop recursion.
for (i = 0; i < length; i++) {
if (i > 0) result.append(separator);
Object elem = getElem(cx, thisObj, i);
if (elem == null || elem == Undefined.instance) {
haslast = false;
continue;
}
haslast = true;
if (toSource) {
result.append(ScriptRuntime.uneval(cx, scope, elem));
} else if (elem instanceof String) {
String s = (String)elem;
if (toSource) {
result.append('\"');
result.append(ScriptRuntime.escapeString(s));
result.append('\"');
} else {
result.append(s);
}
} else {
if (toLocale)
{
Callable fun;
Scriptable funThis;
fun = ScriptRuntime.getPropFunctionAndThis(
elem, "toLocaleString", cx);
funThis = ScriptRuntime.lastStoredScriptable(cx);
elem = fun.call(cx, scope, funThis,
ScriptRuntime.emptyArgs);
}
result.append(ScriptRuntime.toString(elem));
}
}
}
} finally {
if (toplevel) {
cx.iterating = null;
}
}
if (toSource) {
//for [,,].length behavior; we want toString to be symmetric.
if (!haslast && i > 0)
result.append(", ]");
else
result.append(']');
}
return result.toString();
}
/**
* See ECMA 15.4.4.3
*/
private static String js_join(Context cx, Scriptable thisObj,
Object[] args)
{
long llength = getLengthProperty(cx, thisObj);
int length = (int)llength;
if (llength != length) {
throw Context.reportRuntimeError1(
"msg.arraylength.too.big", String.valueOf(llength));
}
// if no args, use "," as separator
String separator = (args.length < 1 || args[0] == Undefined.instance)
? ","
: ScriptRuntime.toString(args[0]);
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
if (i != 0) {
sb.append(separator);
}
if (i < na.dense.length) {
Object temp = na.dense[i];
if (temp != null && temp != Undefined.instance &&
temp != Scriptable.NOT_FOUND)
{
sb.append(ScriptRuntime.toString(temp));
}
}
}
return sb.toString();
}
}
if (length == 0) {
return "";
}
String[] buf = new String[length];
int total_size = 0;
for (int i = 0; i != length; i++) {
Object temp = getElem(cx, thisObj, i);
if (temp != null && temp != Undefined.instance) {
String str = ScriptRuntime.toString(temp);
total_size += str.length();
buf[i] = str;
}
}
total_size += (length - 1) * separator.length();
StringBuffer sb = new StringBuffer(total_size);
for (int i = 0; i != length; i++) {
if (i != 0) {
sb.append(separator);
}
String str = buf[i];
if (str != null) {
// str == null for undefined or null
sb.append(str);
}
}
return sb.toString();
}
/**
* See ECMA 15.4.4.4
*/
private static Scriptable js_reverse(Context cx, Scriptable thisObj,
Object[] args)
{
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly) {
for (int i=0, j=((int)na.length)-1; i < j; i++,j--) {
Object temp = na.dense[i];
na.dense[i] = na.dense[j];
na.dense[j] = temp;
}
return thisObj;
}
}
long len = getLengthProperty(cx, thisObj);
long half = len / 2;
for(long i=0; i < half; i++) {
long j = len - i - 1;
Object temp1 = getElem(cx, thisObj, i);
Object temp2 = getElem(cx, thisObj, j);
setElem(cx, thisObj, i, temp2);
setElem(cx, thisObj, j, temp1);
}
return thisObj;
}
/**
* See ECMA 15.4.4.5
*/
private static Scriptable js_sort(Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
long length = getLengthProperty(cx, thisObj);
if (length <= 1) { return thisObj; }
Object compare;
Object[] cmpBuf;
if (args.length > 0 && Undefined.instance != args[0]) {
// sort with given compare function
compare = args[0];
cmpBuf = new Object[2]; // Buffer for cmp arguments
} else {
// sort with default compare
compare = null;
cmpBuf = null;
}
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly) {
int ilength = (int) length;
heapsort(cx, scope, na.dense, ilength, compare, cmpBuf);
return thisObj;
}
}
// Should we use the extended sort function, or the faster one?
if (length >= Integer.MAX_VALUE) {
heapsort_extended(cx, scope, thisObj, length, compare, cmpBuf);
} else {
int ilength = (int)length;
// copy the JS array into a working array, so it can be
// sorted cheaply.
Object[] working = new Object[ilength];
for (int i = 0; i != ilength; ++i) {
working[i] = getElem(cx, thisObj, i);
}
heapsort(cx, scope, working, ilength, compare, cmpBuf);
// copy the working array back into thisObj
for (int i = 0; i != ilength; ++i) {
setElem(cx, thisObj, i, working[i]);
}
}
return thisObj;
}
// Return true only if x > y
private static boolean isBigger(Context cx, Scriptable scope,
Object x, Object y,
Object cmp, Object[] cmpBuf)
{
if (cmp == null) {
if (cmpBuf != null) Kit.codeBug();
} else {
if (cmpBuf == null || cmpBuf.length != 2) Kit.codeBug();
}
Object undef = Undefined.instance;
Object notfound = Scriptable.NOT_FOUND;
// sort undefined to end
if (y == undef || y == notfound) {
return false; // x can not be bigger then undef
} else if (x == undef || x == notfound) {
return true; // y != undef here, so x > y
}
if (cmp == null) {
// if no cmp function supplied, sort lexicographically
String a = ScriptRuntime.toString(x);
String b = ScriptRuntime.toString(y);
return a.compareTo(b) > 0;
}
else {
// assemble args and call supplied JS cmp function
cmpBuf[0] = x;
cmpBuf[1] = y;
Callable fun = ScriptRuntime.getValueFunctionAndThis(cmp, cx);
Scriptable funThis = ScriptRuntime.lastStoredScriptable(cx);
Object ret = fun.call(cx, scope, funThis, cmpBuf);
double d = ScriptRuntime.toNumber(ret);
// XXX what to do when cmp function returns NaN? ECMA states
// that it's then not a 'consistent comparison function'... but
// then what do we do? Back out and start over with the generic
// cmp function when we see a NaN? Throw an error?
// for now, just ignore it:
return d > 0;
}
}
/** Heapsort implementation.
* See "Introduction to Algorithms" by Cormen, Leiserson, Rivest for details.
* Adjusted for zero based indexes.
*/
private static void heapsort(Context cx, Scriptable scope,
Object[] array, int length,
Object cmp, Object[] cmpBuf)
{
if (length <= 1) Kit.codeBug();
// Build heap
for (int i = length / 2; i != 0;) {
--i;
Object pivot = array[i];
heapify(cx, scope, pivot, array, i, length, cmp, cmpBuf);
}
// Sort heap
for (int i = length; i != 1;) {
--i;
Object pivot = array[i];
array[i] = array[0];
heapify(cx, scope, pivot, array, 0, i, cmp, cmpBuf);
}
}
/** pivot and child heaps of i should be made into heap starting at i,
* original array[i] is never used to have less array access during sorting.
*/
private static void heapify(Context cx, Scriptable scope,
Object pivot, Object[] array, int i, int end,
Object cmp, Object[] cmpBuf)
{
for (;;) {
int child = i * 2 + 1;
if (child >= end) {
break;
}
Object childVal = array[child];
if (child + 1 < end) {
Object nextVal = array[child + 1];
if (isBigger(cx, scope, nextVal, childVal, cmp, cmpBuf)) {
++child; childVal = nextVal;
}
}
if (!isBigger(cx, scope, childVal, pivot, cmp, cmpBuf)) {
break;
}
array[i] = childVal;
i = child;
}
array[i] = pivot;
}
/** Version of heapsort that call getElem/setElem on target to query/assign
* array elements instead of Java array access
*/
private static void heapsort_extended(Context cx, Scriptable scope,
Scriptable target, long length,
Object cmp, Object[] cmpBuf)
{
if (length <= 1) Kit.codeBug();
// Build heap
for (long i = length / 2; i != 0;) {
--i;
Object pivot = getElem(cx, target, i);
heapify_extended(cx, scope, pivot, target, i, length, cmp, cmpBuf);
}
// Sort heap
for (long i = length; i != 1;) {
--i;
Object pivot = getElem(cx, target, i);
setElem(cx, target, i, getElem(cx, target, 0));
heapify_extended(cx, scope, pivot, target, 0, i, cmp, cmpBuf);
}
}
private static void heapify_extended(Context cx, Scriptable scope,
Object pivot, Scriptable target,
long i, long end,
Object cmp, Object[] cmpBuf)
{
for (;;) {
long child = i * 2 + 1;
if (child >= end) {
break;
}
Object childVal = getElem(cx, target, child);
if (child + 1 < end) {
Object nextVal = getElem(cx, target, child + 1);
if (isBigger(cx, scope, nextVal, childVal, cmp, cmpBuf)) {
++child; childVal = nextVal;
}
}
if (!isBigger(cx, scope, childVal, pivot, cmp, cmpBuf)) {
break;
}
setElem(cx, target, i, childVal);
i = child;
}
setElem(cx, target, i, pivot);
}
/**
* Non-ECMA methods.
*/
private static Object js_push(Context cx, Scriptable thisObj,
Object[] args)
{
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly &&
na.ensureCapacity((int) na.length + args.length))
{
for (int i = 0; i < args.length; i++) {
na.dense[(int)na.length++] = args[i];
}
return ScriptRuntime.wrapNumber(na.length);
}
}
long length = getLengthProperty(cx, thisObj);
for (int i = 0; i < args.length; i++) {
setElem(cx, thisObj, length + i, args[i]);
}
length += args.length;
Object lengthObj = setLengthProperty(cx, thisObj, length);
/*
* If JS1.2, follow Perl4 by returning the last thing pushed.
* Otherwise, return the new array length.
*/
if (cx.getLanguageVersion() == Context.VERSION_1_2)
// if JS1.2 && no arguments, return undefined.
return args.length == 0
? Undefined.instance
: args[args.length - 1];
else
return lengthObj;
}
private static Object js_pop(Context cx, Scriptable thisObj,
Object[] args)
{
Object result;
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly && na.length > 0) {
na.length--;
result = na.dense[(int)na.length];
na.dense[(int)na.length] = NOT_FOUND;
return result;
}
}
long length = getLengthProperty(cx, thisObj);
if (length > 0) {
length--;
// Get the to-be-deleted property's value.
result = getElem(cx, thisObj, length);
// We don't need to delete the last property, because
// setLength does that for us.
} else {
result = Undefined.instance;
}
// necessary to match js even when length < 0; js pop will give a
// length property to any target it is called on.
setLengthProperty(cx, thisObj, length);
return result;
}
private static Object js_shift(Context cx, Scriptable thisObj,
Object[] args)
{
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly && na.length > 0) {
na.length--;
Object result = na.dense[0];
System.arraycopy(na.dense, 1, na.dense, 0, (int)na.length);
na.dense[(int)na.length] = NOT_FOUND;
return result;
}
}
Object result;
long length = getLengthProperty(cx, thisObj);
if (length > 0) {
long i = 0;
length--;
// Get the to-be-deleted property's value.
result = getElem(cx, thisObj, i);
/*
* Slide down the array above the first element. Leave i
* set to point to the last element.
*/
if (length > 0) {
for (i = 1; i <= length; i++) {
Object temp = getElem(cx, thisObj, i);
setElem(cx, thisObj, i - 1, temp);
}
}
// We don't need to delete the last property, because
// setLength does that for us.
} else {
result = Undefined.instance;
}
setLengthProperty(cx, thisObj, length);
return result;
}
private static Object js_unshift(Context cx, Scriptable thisObj,
Object[] args)
{
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly &&
na.ensureCapacity((int)na.length + args.length))
{
System.arraycopy(na.dense, 0, na.dense, args.length,
(int) na.length);
for (int i = 0; i < args.length; i++) {
na.dense[i] = args[i];
}
na.length += args.length;
return ScriptRuntime.wrapNumber(na.length);
}
}
long length = getLengthProperty(cx, thisObj);
int argc = args.length;
if (args.length > 0) {
/* Slide up the array to make room for args at the bottom */
if (length > 0) {
for (long last = length - 1; last >= 0; last--) {
Object temp = getElem(cx, thisObj, last);
setElem(cx, thisObj, last + argc, temp);
}
}
/* Copy from argv to the bottom of the array. */
for (int i = 0; i < args.length; i++) {
setElem(cx, thisObj, i, args[i]);
}
/* Follow Perl by returning the new array length. */
length += args.length;
return setLengthProperty(cx, thisObj, length);
}
return ScriptRuntime.wrapNumber(length);
}
private static Object js_splice(Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
NativeArray na = null;
boolean denseMode = false;
if (thisObj instanceof NativeArray) {
na = (NativeArray) thisObj;
denseMode = na.denseOnly;
}
/* create an empty Array to return. */
scope = getTopLevelScope(scope);
int argc = args.length;
if (argc == 0)
return ScriptRuntime.newObject(cx, scope, "Array", null);
long length = getLengthProperty(cx, thisObj);
/* Convert the first argument into a starting index. */
long begin = toSliceIndex(ScriptRuntime.toInteger(args[0]), length);
argc--;
/* Convert the second argument into count */
long count;
if (args.length == 1) {
count = length - begin;
} else {
double dcount = ScriptRuntime.toInteger(args[1]);
if (dcount < 0) {
count = 0;
} else if (dcount > (length - begin)) {
count = length - begin;
} else {
count = (long)dcount;
}
argc--;
}
long end = begin + count;
/* If there are elements to remove, put them into the return value. */
Object result;
if (count != 0) {
if (count == 1
&& (cx.getLanguageVersion() == Context.VERSION_1_2))
{
/*
* JS lacks "list context", whereby in Perl one turns the
* single scalar that's spliced out into an array just by
* assigning it to @single instead of $single, or by using it
* as Perl push's first argument, for instance.
*
* JS1.2 emulated Perl too closely and returned a non-Array for
* the single-splice-out case, requiring callers to test and
* wrap in [] if necessary. So JS1.3, default, and other
* versions all return an array of length 1 for uniformity.
*/
result = getElem(cx, thisObj, begin);
} else {
if (denseMode) {
int intLen = (int) (end - begin);
Object[] copy = new Object[intLen];
System.arraycopy(na.dense, (int) begin, copy, 0, intLen);
result = cx.newArray(scope, copy);
} else {
Scriptable resultArray = ScriptRuntime.newObject(cx, scope,
"Array", null);
for (long last = begin; last != end; last++) {
Object temp = getElem(cx, thisObj, last);
setElem(cx, resultArray, last - begin, temp);
}
result = resultArray;
}
}
} else { // (count == 0)
if (cx.getLanguageVersion() == Context.VERSION_1_2) {
/* Emulate C JS1.2; if no elements are removed, return undefined. */
result = Undefined.instance;
} else {
result = ScriptRuntime.newObject(cx, scope, "Array", null);
}
}
/* Find the direction (up or down) to copy and make way for argv. */
long delta = argc - count;
if (denseMode && length + delta < Integer.MAX_VALUE &&
na.ensureCapacity((int) (length + delta)))
{
System.arraycopy(na.dense, (int) end, na.dense,
(int) (begin + argc), (int) (length - end));
if (argc > 0) {
System.arraycopy(args, 2, na.dense, (int) begin, argc);
}
if (delta < 0) {
Arrays.fill(na.dense, (int) (length + delta), (int) length,
NOT_FOUND);
}
na.length = length + delta;
return result;
}
if (delta > 0) {
for (long last = length - 1; last >= end; last--) {
Object temp = getElem(cx, thisObj, last);
setElem(cx, thisObj, last + delta, temp);
}
} else if (delta < 0) {
for (long last = end; last < length; last++) {
Object temp = getElem(cx, thisObj, last);
setElem(cx, thisObj, last + delta, temp);
}
}
/* Copy from argv into the hole to complete the splice. */
int argoffset = args.length - argc;
for (int i = 0; i < argc; i++) {
setElem(cx, thisObj, begin + i, args[i + argoffset]);
}
/* Update length in case we deleted elements from the end. */
setLengthProperty(cx, thisObj, length + delta);
return result;
}
/*
* See Ecma 262v3 15.4.4.4
*/
private static Scriptable js_concat(Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
// create an empty Array to return.
scope = getTopLevelScope(scope);
Function ctor = ScriptRuntime.getExistingCtor(cx, scope, "Array");
Scriptable result = ctor.construct(cx, scope, ScriptRuntime.emptyArgs);
if (thisObj instanceof NativeArray && result instanceof NativeArray) {
NativeArray denseThis = (NativeArray) thisObj;
NativeArray denseResult = (NativeArray) result;
if (denseThis.denseOnly && denseResult.denseOnly) {
// First calculate length of resulting array
boolean canUseDense = true;
int length = (int) denseThis.length;
for (int i = 0; i < args.length && canUseDense; i++) {
if (ScriptRuntime.instanceOf(args[i], ctor, cx)) {
// only try to use dense approach for Array-like
// objects that are actually NativeArrays
canUseDense = args[i] instanceof NativeArray;
length += ((NativeArray) args[i]).length;
} else {
length++;
}
}
if (canUseDense && denseResult.ensureCapacity(length)) {
System.arraycopy(denseThis.dense, 0, denseResult.dense,
0, (int) denseThis.length);
int cursor = (int) denseThis.length;
for (int i = 0; i < args.length && canUseDense; i++) {
if (args[i] instanceof NativeArray) {
NativeArray arg = (NativeArray) args[i];
System.arraycopy(arg.dense, 0,
denseResult.dense, cursor,
(int)arg.length);
cursor += (int)arg.length;
} else {
denseResult.dense[cursor++] = args[i];
}
}
denseResult.length = length;
return result;
}
}
}
long length;
long slot = 0;
/* Put the target in the result array; only add it as an array
* if it looks like one.
*/
if (ScriptRuntime.instanceOf(thisObj, ctor, cx)) {
length = getLengthProperty(cx, thisObj);
// Copy from the target object into the result
for (slot = 0; slot < length; slot++) {
Object temp = getElem(cx, thisObj, slot);
setElem(cx, result, slot, temp);
}
} else {
setElem(cx, result, slot++, thisObj);
}
/* Copy from the arguments into the result. If any argument
* has a numeric length property, treat it as an array and add
* elements separately; otherwise, just copy the argument.
*/
for (int i = 0; i < args.length; i++) {
if (ScriptRuntime.instanceOf(args[i], ctor, cx)) {
// ScriptRuntime.instanceOf => instanceof Scriptable
Scriptable arg = (Scriptable)args[i];
length = getLengthProperty(cx, arg);
for (long j = 0; j < length; j++, slot++) {
Object temp = getElem(cx, arg, j);
setElem(cx, result, slot, temp);
}
} else {
setElem(cx, result, slot++, args[i]);
}
}
return result;
}
private Scriptable js_slice(Context cx, Scriptable thisObj,
Object[] args)
{
Scriptable scope = getTopLevelScope(this);
Scriptable result = ScriptRuntime.newObject(cx, scope, "Array", null);
long length = getLengthProperty(cx, thisObj);
long begin, end;
if (args.length == 0) {
begin = 0;
end = length;
} else {
begin = toSliceIndex(ScriptRuntime.toInteger(args[0]), length);
if (args.length == 1) {
end = length;
} else {
end = toSliceIndex(ScriptRuntime.toInteger(args[1]), length);
}
}
for (long slot = begin; slot < end; slot++) {
Object temp = getElem(cx, thisObj, slot);
setElem(cx, result, slot - begin, temp);
}
return result;
}
private static long toSliceIndex(double value, long length) {
long result;
if (value < 0.0) {
if (value + length < 0.0) {
result = 0;
} else {
result = (long)(value + length);
}
} else if (value > length) {
result = length;
} else {
result = (long)value;
}
return result;
}
/**
* Implements the methods "indexOf" and "lastIndexOf".
*/
private Object indexOfHelper(Context cx, Scriptable thisObj,
Object[] args, boolean isLast)
{
Object compareTo = args.length > 0 ? args[0] : Undefined.instance;
long length = getLengthProperty(cx, thisObj);
long start;
if (isLast) {
// lastIndexOf
/*
* From http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array:lastIndexOf
* The index at which to start searching backwards. Defaults to the
* array's length, i.e. the whole array will be searched. If the
* index is greater than or equal to the length of the array, the
* whole array will be searched. If negative, it is taken as the
* offset from the end of the array. Note that even when the index
* is negative, the array is still searched from back to front. If
* the calculated index is less than 0, -1 is returned, i.e. the
* array will not be searched.
*/
if (args.length < 2) {
// default
start = length-1;
} else {
start = ScriptRuntime.toInt32(ScriptRuntime.toNumber(args[1]));
if (start >= length)
start = length-1;
else if (start < 0)
start += length;
// Note that start may be negative, but that's okay
// as the result of -1 will fall out from the code below
}
} else {
// indexOf
/*
* From http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array:indexOf
* The index at which to begin the search. Defaults to 0, i.e. the
* whole array will be searched. If the index is greater than or
* equal to the length of the array, -1 is returned, i.e. the array
* will not be searched. If negative, it is taken as the offset from
* the end of the array. Note that even when the index is negative,
* the array is still searched from front to back. If the calculated
* index is less than 0, the whole array will be searched.
*/
if (args.length < 2) {
// default
start = 0;
} else {
start = ScriptRuntime.toInt32(ScriptRuntime.toNumber(args[1]));
if (start < 0) {
start += length;
if (start < 0)
start = 0;
}
// Note that start may be > length-1, but that's okay
// as the result of -1 will fall out from the code below
}
}
if (thisObj instanceof NativeArray) {
NativeArray na = (NativeArray) thisObj;
if (na.denseOnly) {
if (isLast) {
for (int i=(int)start; i >= 0; i--) {
if (na.dense[i] != Scriptable.NOT_FOUND &&
ScriptRuntime.shallowEq(na.dense[i], compareTo))
{
return new Long(i);
}
}
} else {
for (int i=(int)start; i < length; i++) {
if (na.dense[i] != Scriptable.NOT_FOUND &&
ScriptRuntime.shallowEq(na.dense[i], compareTo))
{
return new Long(i);
}
}
}
return NEGATIVE_ONE;
}
}
if (isLast) {
for (long i=start; i >= 0; i--) {
if (ScriptRuntime.shallowEq(getElem(cx, thisObj, i), compareTo)) {
return new Long(i);
}
}
} else {
for (long i=start; i < length; i++) {
if (ScriptRuntime.shallowEq(getElem(cx, thisObj, i), compareTo)) {
return new Long(i);
}
}
}
return NEGATIVE_ONE;
}
/**
* Implements the methods "every", "filter", "forEach", "map", and "some".
*/
private Object iterativeMethod(Context cx, int id, Scriptable scope,
Scriptable thisObj, Object[] args)
{
Object callbackArg = args.length > 0 ? args[0] : Undefined.instance;
if (callbackArg == null || !(callbackArg instanceof Function)) {
throw ScriptRuntime.notFunctionError(
ScriptRuntime.toString(callbackArg));
}
Function f = (Function) callbackArg;
Scriptable parent = ScriptableObject.getTopLevelScope(f);
Scriptable thisArg;
if (args.length < 2 || args[1] == null || args[1] == Undefined.instance)
{
thisArg = parent;
} else {
thisArg = ScriptRuntime.toObject(cx, scope, args[1]);
}
long length = getLengthProperty(cx, thisObj);
Scriptable array = ScriptRuntime.newObject(cx, scope, "Array", null);
long j=0;
for (long i=0; i < length; i++) {
Object[] innerArgs = new Object[3];
Object elem = (i > Integer.MAX_VALUE)
? ScriptableObject.getProperty(thisObj, Long.toString(i))
: ScriptableObject.getProperty(thisObj, (int)i);
if (elem == Scriptable.NOT_FOUND) {
continue;
}
innerArgs[0] = elem;
innerArgs[1] = new Long(i);
innerArgs[2] = thisObj;
Object result = f.call(cx, parent, thisArg, innerArgs);
switch (id) {
case Id_every:
if (!ScriptRuntime.toBoolean(result))
return Boolean.FALSE;
break;
case Id_filter:
if (ScriptRuntime.toBoolean(result))
setElem(cx, array, j++, innerArgs[0]);
break;
case Id_forEach:
break;
case Id_map:
setElem(cx, array, i, result);
break;
case Id_some:
if (ScriptRuntime.toBoolean(result))
return Boolean.TRUE;
break;
}
}
switch (id) {
case Id_every:
return Boolean.TRUE;
case Id_filter:
case Id_map:
return array;
case Id_some:
return Boolean.FALSE;
case Id_forEach:
default:
return Undefined.instance;
}
}
// #string_id_map#
protected int findPrototypeId(String s)
{
int id;
// #generated# Last update: 2005-09-26 15:47:42 EDT
L0: { id = 0; String X = null; int c;
L: switch (s.length()) {
case 3: c=s.charAt(0);
if (c=='m') { if (s.charAt(2)=='p' && s.charAt(1)=='a') {id=Id_map; break L0;} }
else if (c=='p') { if (s.charAt(2)=='p' && s.charAt(1)=='o') {id=Id_pop; break L0;} }
break L;
case 4: switch (s.charAt(2)) {
case 'i': X="join";id=Id_join; break L;
case 'm': X="some";id=Id_some; break L;
case 'r': X="sort";id=Id_sort; break L;
case 's': X="push";id=Id_push; break L;
} break L;
case 5: c=s.charAt(1);
if (c=='h') { X="shift";id=Id_shift; }
else if (c=='l') { X="slice";id=Id_slice; }
else if (c=='v') { X="every";id=Id_every; }
break L;
case 6: c=s.charAt(0);
if (c=='c') { X="concat";id=Id_concat; }
else if (c=='f') { X="filter";id=Id_filter; }
else if (c=='s') { X="splice";id=Id_splice; }
break L;
case 7: switch (s.charAt(0)) {
case 'f': X="forEach";id=Id_forEach; break L;
case 'i': X="indexOf";id=Id_indexOf; break L;
case 'r': X="reverse";id=Id_reverse; break L;
case 'u': X="unshift";id=Id_unshift; break L;
} break L;
case 8: c=s.charAt(3);
if (c=='o') { X="toSource";id=Id_toSource; }
else if (c=='t') { X="toString";id=Id_toString; }
break L;
case 11: c=s.charAt(0);
if (c=='c') { X="constructor";id=Id_constructor; }
else if (c=='l') { X="lastIndexOf";id=Id_lastIndexOf; }
break L;
case 14: X="toLocaleString";id=Id_toLocaleString; break L;
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
}
// #/generated#
return id;
}
private static final int
Id_constructor = 1,
Id_toString = 2,
Id_toLocaleString = 3,
Id_toSource = 4,
Id_join = 5,
Id_reverse = 6,
Id_sort = 7,
Id_push = 8,
Id_pop = 9,
Id_shift = 10,
Id_unshift = 11,
Id_splice = 12,
Id_concat = 13,
Id_slice = 14,
Id_indexOf = 15,
Id_lastIndexOf = 16,
Id_every = 17,
Id_filter = 18,
Id_forEach = 19,
Id_map = 20,
Id_some = 21,
MAX_PROTOTYPE_ID = 21;
// #/string_id_map#
private static final int
ConstructorId_join = -Id_join,
ConstructorId_reverse = -Id_reverse,
ConstructorId_sort = -Id_sort,
ConstructorId_push = -Id_push,
ConstructorId_pop = -Id_pop,
ConstructorId_shift = -Id_shift,
ConstructorId_unshift = -Id_unshift,
ConstructorId_splice = -Id_splice,
ConstructorId_concat = -Id_concat,
ConstructorId_slice = -Id_slice,
ConstructorId_indexOf = -Id_indexOf,
ConstructorId_lastIndexOf = -Id_lastIndexOf,
ConstructorId_every = -Id_every,
ConstructorId_filter = -Id_filter,
ConstructorId_forEach = -Id_forEach,
ConstructorId_map = -Id_map,
ConstructorId_some = -Id_some;
/**
* Internal representation of the JavaScript array's length property.
*/
private long length;
/**
* Fast storage for dense arrays. Sparse arrays will use the superclass's
* hashtable storage scheme.
*/
private Object[] dense;
/**
* True if all numeric properties are stored in dense.
*/
private boolean denseOnly;
/**
* The maximum size of dense that will be allocated initially.
*/
private static int maximumInitialCapacity = 10000;
/**
* The default capacity for dense.
*/
private static final int DEFAULT_INITIAL_CAPACITY = 10;
/**
* The factor to grow dense by.
*/
private static final double GROW_FACTOR = 1.5;
private static final int MAX_PRE_GROW_SIZE = (int)(Integer.MAX_VALUE / GROW_FACTOR);
}