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Rhino JavaScript Java Library Source Code
Rhino JavaScript Java Library is an open-source implementation of JavaScript written entirely in Java.
Rhino JavaScript Java Library Source Code files are provided in binary package (rhino-1.7.14.zip).
You can also browse the source code below:
✍: FYIcenter.com
⏎ org/mozilla/javascript/NativeWeakMap.java
/* -*- 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 java.io.IOException; import java.io.ObjectInputStream; import java.util.WeakHashMap; /** * This is an implementation of the ES6 WeakMap class. As per the spec, keys must be ordinary * objects. Since there is no defined "equality" for objects, comparisions are done strictly by * object equality. Both ES6 and the java.util.WeakHashMap class have the same basic structure -- * entries are removed automatically when the sole remaining reference to the key is a weak * reference. Therefore, we can use WeakHashMap as the basis of this implementation and preserve the * same semantics. */ public class NativeWeakMap extends IdScriptableObject { private static final long serialVersionUID = 8670434366883930453L; private static final Object MAP_TAG = "WeakMap"; private boolean instanceOfWeakMap = false; private transient WeakHashMap<Scriptable, Object> map = new WeakHashMap<>(); private static final Object NULL_VALUE = new Object(); static void init(Scriptable scope, boolean sealed) { NativeWeakMap m = new NativeWeakMap(); m.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed); } @Override public String getClassName() { return "WeakMap"; } @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) { NativeWeakMap nm = new NativeWeakMap(); nm.instanceOfWeakMap = true; if (args.length > 0) { NativeMap.loadFromIterable(cx, scope, nm, NativeMap.key(args)); } return nm; } throw ScriptRuntime.typeErrorById("msg.no.new", "WeakMap"); case Id_delete: return realThis(thisObj, f).js_delete(NativeMap.key(args)); case Id_get: return realThis(thisObj, f).js_get(NativeMap.key(args)); case Id_has: return realThis(thisObj, f).js_has(NativeMap.key(args)); case Id_set: return realThis(thisObj, f) .js_set( NativeMap.key(args), args.length > 1 ? args[1] : Undefined.instance); } throw new IllegalArgumentException( "WeakMap.prototype has no method: " + f.getFunctionName()); } private Object js_delete(Object key) { if (!ScriptRuntime.isObject(key)) { return Boolean.FALSE; } return Boolean.valueOf(map.remove(key) != null); } private Object js_get(Object key) { if (!ScriptRuntime.isObject(key)) { return Undefined.instance; } Object result = map.get(key); if (result == null) { return Undefined.instance; } else if (result == NULL_VALUE) { return null; } return result; } private Object js_has(Object key) { if (!ScriptRuntime.isObject(key)) { return Boolean.FALSE; } return Boolean.valueOf(map.containsKey(key)); } private Object js_set(Object key, Object v) { // As the spec says, only a true "Object" can be the key to a WeakMap. // Use the default object equality here. ScriptableObject does not override // equals or hashCode, which means that in effect we are only keying on object identity. // This is all correct according to the ECMAscript spec. if (!ScriptRuntime.isObject(key)) { throw ScriptRuntime.typeErrorById("msg.arg.not.object", ScriptRuntime.typeof(key)); } // Map.get() does not distinguish between "not found" and a null value. So, // replace true null here with a marker so that we can re-convert in "get". final Object value = (v == null ? NULL_VALUE : v); map.put((Scriptable) key, value); return this; } private static NativeWeakMap realThis(Scriptable thisObj, IdFunctionObject f) { final NativeWeakMap nm = ensureType(thisObj, NativeWeakMap.class, f); if (!nm.instanceOfWeakMap) { // Check for "Map internal data tag" throw ScriptRuntime.typeErrorById("msg.incompat.call", f.getFunctionName()); } return nm; } @Override protected void initPrototypeId(int id) { if (id == SymbolId_toStringTag) { initPrototypeValue( SymbolId_toStringTag, SymbolKey.TO_STRING_TAG, getClassName(), DONTENUM | READONLY); return; } String s, fnName = null; int arity; switch (id) { case Id_constructor: arity = 0; s = "constructor"; break; case Id_delete: arity = 1; s = "delete"; break; case Id_get: arity = 1; s = "get"; break; case Id_has: arity = 1; s = "has"; break; case Id_set: arity = 2; s = "set"; break; default: throw new IllegalArgumentException(String.valueOf(id)); } initPrototypeMethod(MAP_TAG, id, s, fnName, arity); } @Override protected int findPrototypeId(Symbol k) { 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 "delete": id = Id_delete; break; case "get": id = Id_get; break; case "has": id = Id_has; break; case "set": id = Id_set; break; default: id = 0; break; } return id; } private static final int Id_constructor = 1, Id_delete = 2, Id_get = 3, Id_has = 4, Id_set = 5, SymbolId_toStringTag = 6, MAX_PROTOTYPE_ID = SymbolId_toStringTag; private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); map = new WeakHashMap<>(); } }
⏎ org/mozilla/javascript/NativeWeakMap.java
Or download all of them as a single archive file:
File name: rhino-1.7.14-sources.jar File size: 1029165 bytes Release date: 2022-01-06 Download
⇒ Example code to Test rhino-runtime-1.7.14.jar
⇐ Download Rhino JavaScript Binary Package
2022-05-03, 35366👍, 1💬
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