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Copy pathNativeArray.java
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2502 lines (2250 loc) · 87 KB
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/* -*- 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/. */
package org.mozilla.javascript;
import static org.mozilla.javascript.ScriptRuntimeES6.requireObjectCoercible;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import org.mozilla.javascript.regexp.NativeRegExp;
/**
* This class implements the Array native object.
* @author Norris Boyd
* @author Mike McCabe
*/
public class NativeArray extends IdScriptableObject implements List
{
private 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 = "Array";
private static final Long NEGATIVE_ONE = Long.valueOf(-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;
}
@Override
public String getClassName()
{
return "Array";
}
private static final int
Id_length = 1,
MAX_INSTANCE_ID = 1;
@Override
protected int getMaxInstanceId()
{
return MAX_INSTANCE_ID;
}
@Override
protected void setInstanceIdAttributes(int id, int attr) {
if (id == Id_length) {
lengthAttr = attr;
}
}
@Override
protected int findInstanceIdInfo(String s)
{
if (s.equals("length")) {
return instanceIdInfo(lengthAttr, Id_length);
}
return super.findInstanceIdInfo(s);
}
@Override
protected String getInstanceIdName(int id)
{
if (id == Id_length) { return "length"; }
return super.getInstanceIdName(id);
}
@Override
protected Object getInstanceIdValue(int id)
{
if (id == Id_length) {
return ScriptRuntime.wrapNumber(length);
}
return super.getInstanceIdValue(id);
}
@Override
protected void setInstanceIdValue(int id, Object value)
{
if (id == Id_length) {
setLength(value); return;
}
super.setInstanceIdValue(id, value);
}
@Override
protected void fillConstructorProperties(IdFunctionObject ctor)
{
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_join,
"join", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_reverse,
"reverse", 0);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_sort,
"sort", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_push,
"push", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_pop,
"pop", 0);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_shift,
"shift", 0);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_unshift,
"unshift", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_splice,
"splice", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_concat,
"concat", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_slice,
"slice", 2);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_indexOf,
"indexOf", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_lastIndexOf,
"lastIndexOf", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_every,
"every", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_filter,
"filter", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_forEach,
"forEach", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_map,
"map", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_some,
"some", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_find,
"find", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_findIndex,
"findIndex", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_reduce,
"reduce", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_reduceRight,
"reduceRight", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_isArray,
"isArray", 1);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_of,
"of", 0);
addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_from,
"from", 1);
super.fillConstructorProperties(ctor);
}
@Override
protected void initPrototypeId(int id)
{
if (id == SymbolId_iterator) {
initPrototypeMethod(ARRAY_TAG, id, SymbolKey.ITERATOR, "[Symbol.iterator]", 0);
return;
}
String s, fnName = null;
int arity;
switch (id) {
case Id_constructor: arity=1; s="constructor"; break;
case Id_toString: arity=0; s="toString"; break;
case Id_toLocaleString: arity=0; 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=0; s="pop"; break;
case Id_shift: arity=0; s="shift"; break;
case Id_unshift: arity=1; s="unshift"; break;
case Id_splice: arity=2; s="splice"; break;
case Id_concat: arity=1; s="concat"; break;
case Id_slice: arity=2; 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;
case Id_find: arity=1; s="find"; break;
case Id_findIndex: arity=1; s="findIndex"; break;
case Id_reduce: arity=1; s="reduce"; break;
case Id_reduceRight: arity=1; s="reduceRight"; break;
case Id_fill: arity=1; s="fill"; break;
case Id_keys: arity=0; s="keys"; break;
case Id_values: arity=0; s="values"; break;
case Id_entries: arity=0; s="entries"; break;
case Id_includes: arity=1; s="includes"; break;
case Id_copyWithin: arity=2; s="copyWithin"; break;
default: throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(ARRAY_TAG, id, s, fnName, arity);
}
@Override
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:
case ConstructorId_find:
case ConstructorId_findIndex:
case ConstructorId_reduce:
case ConstructorId_reduceRight: {
// this is a small trick; we will handle all the ConstructorId_xxx calls
// the same way the object calls are processed
// so we adjust the args, inverting the id and
// restarting the method selection
// Attention: the implementations have to be aware of this
if (args.length > 0) {
thisObj = ScriptRuntime.toObject(cx, 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 ConstructorId_isArray:
return args.length > 0 && js_isArray(args[0]);
case ConstructorId_of: {
return js_of(cx, scope, thisObj, args);
}
case ConstructorId_from: {
return js_from(cx, scope, thisObj, args);
}
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 js_indexOf(cx, scope, thisObj, args);
case Id_lastIndexOf:
return js_lastIndexOf(cx, scope, thisObj, args);
case Id_includes:
return js_includes(cx, scope, thisObj, args);
case Id_fill:
return js_fill(cx, scope, thisObj, args);
case Id_copyWithin:
return js_copyWithin(cx, scope, thisObj, args);
case Id_every:
case Id_filter:
case Id_forEach:
case Id_map:
case Id_some:
case Id_find:
case Id_findIndex:
return iterativeMethod(cx, f, scope, thisObj, args);
case Id_reduce:
case Id_reduceRight:
return reduceMethod(cx, id, scope, thisObj, args);
case Id_keys:
thisObj = ScriptRuntime.toObject(cx, scope, thisObj);
return new NativeArrayIterator(scope, thisObj, NativeArrayIterator.ARRAY_ITERATOR_TYPE.KEYS);
case Id_entries:
thisObj = ScriptRuntime.toObject(cx, scope, thisObj);
return new NativeArrayIterator(scope, thisObj, NativeArrayIterator.ARRAY_ITERATOR_TYPE.ENTRIES);
case Id_values:
case SymbolId_iterator:
thisObj = ScriptRuntime.toObject(cx, scope, thisObj);
return new NativeArrayIterator(scope, thisObj, NativeArrayIterator.ARRAY_ITERATOR_TYPE.VALUES);
}
throw new IllegalArgumentException("Array.prototype has no method: " + f.getFunctionName());
}
}
@Override
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);
}
@Override
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);
}
private static long toArrayIndex(Object id) {
if (id instanceof String) {
return toArrayIndex((String)id);
} else if (id instanceof Number) {
return toArrayIndex(((Number)id).doubleValue());
}
return -1;
}
// if id is an array index (ECMA 15.4.0), return the number,
// otherwise return -1L
private static long toArrayIndex(String id)
{
long index = toArrayIndex(ScriptRuntime.toNumber(id));
// 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;
}
private static long toArrayIndex(double d) {
if (!Double.isNaN(d)) {
long index = ScriptRuntime.toUint32(d);
if (index == d && index != 4294967295L) {
return index;
}
}
return -1;
}
private static int toDenseIndex(Object id) {
long index = toArrayIndex(id);
return 0 <= index && index < Integer.MAX_VALUE ? (int) index : -1;
}
@Override
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;
}
@Override
public void put(int index, Scriptable start, Object value)
{
if (start == this && !isSealed() && dense != null && 0 <= index &&
(denseOnly || !isGetterOrSetter(null, index, true)))
{
if (!isExtensible() && this.length <= index) {
return;
} else 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 && (lengthAttr & READONLY) == 0) {
// 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;
}
}
}
@Override
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);
}
}
@Override
public Object[] getIds(boolean nonEnumerable, boolean getSymbols)
{
Object[] superIds = super.getIds(nonEnumerable, getSymbols);
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] = Integer.valueOf(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 List<Integer> getIndexIds() {
Object[] ids = getIds();
List<Integer> indices = new ArrayList<Integer>(ids.length);
for (Object id : ids) {
int int32Id = ScriptRuntime.toInt32(id);
if (int32Id >= 0 && ScriptRuntime.toString(int32Id).equals(ScriptRuntime.toString(id))) {
indices.add(int32Id);
}
}
return indices;
}
@Override
public Object getDefaultValue(Class<?> hint)
{
if (hint == ScriptRuntime.NumberClass) {
Context cx = Context.getContext();
if (cx.getLanguageVersion() == Context.VERSION_1_2)
return Long.valueOf(length);
}
return super.getDefaultValue(hint);
}
private ScriptableObject defaultIndexPropertyDescriptor(Object value) {
Scriptable scope = getParentScope();
if (scope == null) scope = this;
ScriptableObject desc = new NativeObject();
ScriptRuntime.setBuiltinProtoAndParent(desc, scope, TopLevel.Builtins.Object);
desc.defineProperty("value", value, EMPTY);
desc.defineProperty("writable", true, EMPTY);
desc.defineProperty("enumerable", true, EMPTY);
desc.defineProperty("configurable", true, EMPTY);
return desc;
}
@Override
public int getAttributes(int index) {
if (dense != null && index >= 0 && index < dense.length
&& dense[index] != NOT_FOUND) {
return EMPTY;
}
return super.getAttributes(index);
}
@Override
protected ScriptableObject getOwnPropertyDescriptor(Context cx, Object id) {
if (dense != null) {
int index = toDenseIndex(id);
if (0 <= index && index < dense.length && dense[index] != NOT_FOUND) {
Object value = dense[index];
return defaultIndexPropertyDescriptor(value);
}
}
return super.getOwnPropertyDescriptor(cx, id);
}
@Override
protected void defineOwnProperty(Context cx, Object id,
ScriptableObject desc,
boolean checkValid) {
if (dense != null) {
Object[] values = dense;
dense = null;
denseOnly = false;
for (int i = 0; i < values.length; i++) {
if (values[i] != NOT_FOUND) {
put(i, this, values[i]);
}
}
}
long index = toArrayIndex(id);
if (index >= length) {
length = index + 1;
}
super.defineOwnProperty(cx, id, desc, checkValid);
}
/**
* 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);
}
Object arg0 = args[0];
if (args.length > 1 || !(arg0 instanceof Number)) {
return new NativeArray(args);
}
long len = ScriptRuntime.toUint32(arg0);
if (len != ((Number)arg0).doubleValue()) {
String msg = ScriptRuntime.getMessage0("msg.arraylength.bad");
throw ScriptRuntime.constructError("RangeError", msg);
}
return new NativeArray(len);
}
private static Scriptable callConstructorOrCreateArray(Context cx, Scriptable scope,
Scriptable arg, long length, boolean lengthAlways) {
Scriptable result = null;
if (arg instanceof Function) {
try {
final Object[] args = (lengthAlways || (length > 0)) ?
new Object[]{length} : ScriptRuntime.emptyArgs;
result = ((Function) arg).construct(cx, scope, args);
} catch (EcmaError ee) {
if (!"TypeError".equals(ee.getName())) {
throw ee;
}
// If we get here then it is likely that the function we called is not really
// a constructor. Unfortunately there's no better way to tell in Rhino right now.
}
}
if (result == null) {
// "length" below is really a hint so don't worry if it's really large
result = cx.newArray(scope, (length > Integer.MAX_VALUE) ? 0 : (int)length);
}
return result;
}
private static Object js_from(Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
final Scriptable items =
ScriptRuntime.toObject(scope, (args.length >= 1) ? args[0] : Undefined.instance);
Object mapArg = (args.length >= 2) ? args[1] : Undefined.instance;
Scriptable thisArg = Undefined.SCRIPTABLE_UNDEFINED;
final boolean mapping = !Undefined.isUndefined(mapArg);
Function mapFn = null;
if (mapping) {
if (!(mapArg instanceof Function)) {
throw ScriptRuntime.typeError0("msg.map.function.not");
}
mapFn = (Function)mapArg;
if (args.length >= 3) {
thisArg = ensureScriptable(args[2]);
}
}
Object iteratorProp = ScriptableObject.getProperty(items, SymbolKey.ITERATOR);
if (!(items instanceof NativeArray) && (iteratorProp != Scriptable.NOT_FOUND) &&
!Undefined.isUndefined(iteratorProp)) {
final Object iterator = ScriptRuntime.callIterator(items, cx, scope);
if (!Undefined.isUndefined(iterator)) {
final Scriptable result = callConstructorOrCreateArray(cx, scope, thisObj, 0, false);
long k = 0;
try (IteratorLikeIterable it = new IteratorLikeIterable(cx, scope, iterator)) {
for (Object temp : it) {
if (mapping) {
temp = mapFn.call(cx, scope, thisArg, new Object[]{temp, k});
}
defineElem(cx, result, k, temp);
k++;
}
}
setLengthProperty(cx, result, k);
return result;
}
}
final long length = getLengthProperty(cx, items, false);
final Scriptable result = callConstructorOrCreateArray(cx, scope, thisObj, length, true);
for (long k = 0; k < length; k++) {
Object temp = getRawElem(items, k);
if (temp != Scriptable.NOT_FOUND) {
if (mapping) {
temp = mapFn.call(cx, scope, thisArg, new Object[] { temp, k });
}
defineElem(cx, result, k, temp);
}
}
setLengthProperty(cx, result, length);
return result;
}
private static Object js_of(Context cx, Scriptable scope, Scriptable thisObj, Object[] args)
{
final Scriptable result =
callConstructorOrCreateArray(cx, scope, thisObj, args.length, true);
for (int i = 0; i < args.length; i++) {
defineElem(cx, result, i, args[i]);
}
setLengthProperty(cx, result, args.length);
return result;
}
public long getLength() {
return length;
}
/** @deprecated Use {@link #getLength()} instead. */
@Deprecated
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.
* ?
*/
if ((lengthAttr & READONLY) != 0) {
return;
}
double d = ScriptRuntime.toNumber(val);
long longVal = ScriptRuntime.toUint32(d);
if (longVal != d) {
String msg = ScriptRuntime.getMessage0("msg.arraylength.bad");
throw ScriptRuntime.constructError("RangeError", msg);
}
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, boolean throwIfTooLarge) {
// These will both give numeric lengths within Uint32 range.
if (obj instanceof NativeString) {
return ((NativeString)obj).getLength();
}
if (obj instanceof NativeArray) {
return ((NativeArray)obj).getLength();
}
Object len = ScriptableObject.getProperty(obj, "length");
if (len == Scriptable.NOT_FOUND) {
// toUint32(undefined) == 0
return 0;
}
double doubleLen = ScriptRuntime.toNumber(len);
if (doubleLen > NativeNumber.MAX_SAFE_INTEGER) {
if (throwIfTooLarge) {
String msg = ScriptRuntime.getMessage0("msg.arraylength.bad");
throw ScriptRuntime.constructError("RangeError", msg);
}
return (int) NativeNumber.MAX_SAFE_INTEGER;
}
if (doubleLen < 0) {
return 0;
}
return ScriptRuntime.toUint32(len);
}
private static Object setLengthProperty(Context cx, Scriptable target,
long length)
{
Object len = ScriptRuntime.wrapNumber(length);
ScriptableObject.putProperty(target, "length", len);
return len;
}
/* 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)
{
Object elem = getRawElem(target, index);
return (elem != Scriptable.NOT_FOUND ? elem : Undefined.instance);
}
// same as getElem, but without converting NOT_FOUND to undefined
private static Object getRawElem(Scriptable target, long index) {
if (index > Integer.MAX_VALUE) {
return ScriptableObject.getProperty(target, Long.toString(index));
}
return ScriptableObject.getProperty(target, (int)index);
}
private static void defineElem(Context cx, Scriptable target, long index,
Object value)
{
if (index > Integer.MAX_VALUE) {
String id = Long.toString(index);
target.put(id, target, value);
} else {
target.put((int)index, target, value);
}
}
private static void setElem(Context cx, Scriptable target, long index,
Object value)
{
if (index > Integer.MAX_VALUE) {
String id = Long.toString(index);
ScriptableObject.putProperty(target, id, value);
} else {
ScriptableObject.putProperty(target, (int)index, value);
}
}
// Similar as setElem(), but triggers deleteElem() if value is NOT_FOUND
private static void setRawElem(Context cx, Scriptable target, long index,
Object value) {
if (value == NOT_FOUND) {
deleteElem(target, index);
} else {
setElem(cx, target, index, value);
}
}
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; StringBuilders are limited to 2^31 in java.
*/
long length = getLengthProperty(cx, thisObj, false);
StringBuilder result = new StringBuilder(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.
// make toSource print null and undefined values in recent versions
boolean skipUndefinedAndNull = !toSource
|| cx.getLanguageVersion() < Context.VERSION_1_5;
for (i = 0; i < length; i++) {
if (i > 0) result.append(separator);
Object elem = getRawElem(thisObj, i);
if (elem == NOT_FOUND || (skipUndefinedAndNull &&
(elem == null || elem == Undefined.instance))) {
haslast = false;
continue;
}
haslast = true;
if (toSource) {
result.append(ScriptRuntime.uneval(cx, scope, elem));
} else if (elem instanceof String) {
result.append((String)elem);