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Rhino JavaScript runtime jar, excludes tools & JSR-223 Script Engine wrapper.
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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;
public class NativeMap extends IdScriptableObject {
private static final long serialVersionUID = 1171922614280016891L;
private static final Object MAP_TAG = "Map";
static final String ITERATOR_TAG = "Map Iterator";
private final Hashtable entries = new Hashtable();
private boolean instanceOfMap = false;
static void init(Context cx, Scriptable scope, boolean sealed) {
NativeMap obj = new NativeMap();
IdFunctionObject constructor = obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, false);
ScriptableObject desc = (ScriptableObject) cx.newObject(scope);
desc.put("enumerable", desc, Boolean.FALSE);
desc.put("configurable", desc, Boolean.TRUE);
desc.put("get", desc, obj.get(NativeSet.GETSIZE, obj));
obj.defineOwnProperty(cx, "size", desc);
ScriptRuntimeES6.addSymbolSpecies(cx, scope, constructor);
if (sealed) {
obj.sealObject();
}
}
@Override
public String getClassName() {
return "Map";
}
@Override
public Object execIdCall(
IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
if (!f.hasTag(MAP_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
switch (id) {
case Id_constructor:
if (thisObj == null) {
NativeMap nm = new NativeMap();
nm.instanceOfMap = true;
if (args.length > 0) {
loadFromIterable(cx, scope, nm, key(args));
}
return nm;
}
throw ScriptRuntime.typeErrorById("msg.no.new", "Map");
case Id_set:
return realThis(thisObj, f)
.js_set(key(args), args.length > 1 ? args[1] : Undefined.instance);
case Id_delete:
return realThis(thisObj, f).js_delete(key(args));
case Id_get:
return realThis(thisObj, f).js_get(key(args));
case Id_has:
return realThis(thisObj, f).js_has(key(args));
case Id_clear:
return realThis(thisObj, f).js_clear();
case Id_keys:
return realThis(thisObj, f).js_iterator(scope, NativeCollectionIterator.Type.KEYS);
case Id_values:
return realThis(thisObj, f)
.js_iterator(scope, NativeCollectionIterator.Type.VALUES);
case Id_entries:
return realThis(thisObj, f).js_iterator(scope, NativeCollectionIterator.Type.BOTH);
case Id_forEach:
return realThis(thisObj, f)
.js_forEach(
cx,
scope,
args.length > 0 ? args[0] : Undefined.instance,
args.length > 1 ? args[1] : Undefined.instance);
case SymbolId_getSize:
return realThis(thisObj, f).js_getSize();
}
throw new IllegalArgumentException("Map.prototype has no method: " + f.getFunctionName());
}
private Object js_set(Object k, Object v) {
// Special handling of "negative zero" from the spec.
Object key = k;
if ((key instanceof Number) && ((Number) key).doubleValue() == ScriptRuntime.negativeZero) {
key = ScriptRuntime.zeroObj;
}
entries.put(key, v);
return this;
}
private Object js_delete(Object arg) {
return Boolean.valueOf(entries.deleteEntry(arg));
}
private Object js_get(Object arg) {
final Hashtable.Entry entry = entries.getEntry(arg);
if (entry == null) {
return Undefined.instance;
}
return entry.value;
}
private Object js_has(Object arg) {
return Boolean.valueOf(entries.has(arg));
}
private Object js_getSize() {
return Integer.valueOf(entries.size());
}
private Object js_iterator(Scriptable scope, NativeCollectionIterator.Type type) {
return new NativeCollectionIterator(scope, ITERATOR_TAG, type, entries.iterator());
}
private Object js_clear() {
entries.clear();
return Undefined.instance;
}
private Object js_forEach(Context cx, Scriptable scope, Object arg1, Object arg2) {
if (!(arg1 instanceof Callable)) {
throw ScriptRuntime.typeErrorById(
"msg.isnt.function", arg1, ScriptRuntime.typeof(arg1));
}
final Callable f = (Callable) arg1;
boolean isStrict = cx.isStrictMode();
for (Hashtable.Entry entry : entries) {
// Per spec must convert every time so that primitives are always regenerated...
Scriptable thisObj = ScriptRuntime.toObjectOrNull(cx, arg2, scope);
if (thisObj == null && !isStrict) {
thisObj = scope;
}
if (thisObj == null) {
thisObj = Undefined.SCRIPTABLE_UNDEFINED;
}
final Hashtable.Entry e = entry;
f.call(cx, scope, thisObj, new Object[] {e.value, e.key, this});
}
return Undefined.instance;
}
/**
* If an "iterable" object was passed to the constructor, there are many many things to do...
* Make this static because NativeWeakMap has the exact same requirement.
*/
static void loadFromIterable(Context cx, Scriptable scope, ScriptableObject map, Object arg1) {
if ((arg1 == null) || Undefined.instance.equals(arg1)) {
return;
}
// Call the "[Symbol.iterator]" property as a function.
final Object ito = ScriptRuntime.callIterator(arg1, cx, scope);
if (Undefined.instance.equals(ito)) {
// Per spec, ignore if the iterator is undefined
return;
}
// Find the "add" function of our own prototype, since it might have
// been replaced. Since we're not fully constructed yet, create a dummy instance
// so that we can get our own prototype.
Scriptable proto = ScriptableObject.getClassPrototype(scope, map.getClassName());
final Callable set = ScriptRuntime.getPropFunctionAndThis(proto, "set", cx, scope);
ScriptRuntime.lastStoredScriptable(cx);
ScriptRuntime.loadFromIterable(
cx,
scope,
arg1,
(key, value) -> set.call(cx, scope, map, new Object[] {key, value}));
}
private static NativeMap realThis(Scriptable thisObj, IdFunctionObject f) {
final NativeMap nm = ensureType(thisObj, NativeMap.class, f);
if (!nm.instanceOfMap) {
// Check for "Map internal data tag"
throw ScriptRuntime.typeErrorById("msg.incompat.call", f.getFunctionName());
}
return nm;
}
@Override
protected void initPrototypeId(int id) {
switch (id) {
case SymbolId_getSize:
initPrototypeMethod(MAP_TAG, id, NativeSet.GETSIZE, "get size", 0);
return;
case SymbolId_toStringTag:
initPrototypeValue(
SymbolId_toStringTag,
SymbolKey.TO_STRING_TAG,
getClassName(),
DONTENUM | READONLY);
return;
// fallthrough
}
String s, fnName = null;
int arity;
switch (id) {
case Id_constructor:
arity = 0;
s = "constructor";
break;
case Id_set:
arity = 2;
s = "set";
break;
case Id_get:
arity = 1;
s = "get";
break;
case Id_delete:
arity = 1;
s = "delete";
break;
case Id_has:
arity = 1;
s = "has";
break;
case Id_clear:
arity = 0;
s = "clear";
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_forEach:
arity = 1;
s = "forEach";
break;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(MAP_TAG, id, s, fnName, arity);
}
@Override
protected int findPrototypeId(Symbol k) {
if (NativeSet.GETSIZE.equals(k)) {
return SymbolId_getSize;
}
if (SymbolKey.ITERATOR.equals(k)) {
// ECMA spec says that the "Symbol.iterator" property of the prototype has the
// "same value" as the "entries" property. We implement this by returning the
// ID of "entries" when the iterator symbol is accessed.
return Id_entries;
}
if (SymbolKey.TO_STRING_TAG.equals(k)) {
return SymbolId_toStringTag;
}
return 0;
}
@Override
protected int findPrototypeId(String s) {
int id;
switch (s) {
case "constructor":
id = Id_constructor;
break;
case "set":
id = Id_set;
break;
case "get":
id = Id_get;
break;
case "delete":
id = Id_delete;
break;
case "has":
id = Id_has;
break;
case "clear":
id = Id_clear;
break;
case "keys":
id = Id_keys;
break;
case "values":
id = Id_values;
break;
case "entries":
id = Id_entries;
break;
case "forEach":
id = Id_forEach;
break;
default:
id = 0;
break;
}
return id;
}
// Note that "SymbolId_iterator" is not present here. That's because the spec
// requires that it be the same value as the "entries" prototype property.
private static final int Id_constructor = 1,
Id_set = 2,
Id_get = 3,
Id_delete = 4,
Id_has = 5,
Id_clear = 6,
Id_keys = 7,
Id_values = 8,
Id_entries = 9,
Id_forEach = 10,
SymbolId_getSize = 11,
SymbolId_toStringTag = 12,
MAX_PROTOTYPE_ID = SymbolId_toStringTag;
/**
* Extracts the key from the first args entry if any and takes care of the Delegator. This is
* used by {@code NativeSet}, {@code NativeWeakMap}, and {@code NativeWekSet} also.
*
* @param args the args
* @return the first argument (de-delegated) or undefined if there is no element in args
*/
static Object key(Object[] args) {
if (args.length > 0) {
Object key = args[0];
if (key instanceof Delegator) {
return ((Delegator) key).getDelegee();
}
return key;
}
return Undefined.instance;
}
}