Resolving bug 258844: implementation of continuation support for Rhino interpret

er inspired by Christopher Oliver work for custom Rhino version for cocoon.apach
e.org.

js/rhino/src/org/mozilla/javascript/Continuation.java

@@ -0,0 +1,118 @@
+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape 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/NPL/
+ *
+ * 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 Netscape are
+ * Copyright (C) 1997-1999 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s):
+ * Igor Bukanov
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU Public License (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 NPL, indicate your decision by
+ * deleting the provisions above and replace 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 NPL or the GPL.
+ */
+
+package org.mozilla.javascript;
+
+final class Continuation extends IdScriptableObject implements Function
+{
+    private static final Object FTAG = new Object();
+
+    Object data;
+
+    static void init(Context cx, Scriptable scope, boolean sealed)
+    {
+        Continuation obj = new Continuation();
+        obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
+    }
+
+    public String getClassName()
+    {
+        return "Continuation";
+    }
+
+    public Scriptable construct(Context cx, Scriptable scope, Object[] args)
+    {
+        throw Context.reportRuntimeError("Direct call is not supported");
+    }
+
+    public Object call(Context cx, Scriptable scope, Scriptable thisObj,
+                       Object[] args)
+    {
+        return Interpreter.restartContinuation(this, cx, scope, args);
+    }
+
+    static boolean isContinuationConstructor(IdFunctionObject f)
+    {
+        if (f.hasTag(FTAG) && f.methodId() == Id_constructor) {
+            return true;
+        }
+        return false;
+    }
+
+    protected void initPrototypeId(int id)
+    {
+        String s;
+        int arity;
+        switch (id) {
+          case Id_constructor: arity=0; s="constructor"; break;
+          default: throw new IllegalArgumentException(String.valueOf(id));
+        }
+        initPrototypeMethod(FTAG, id, s, arity);
+    }
+
+    public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
+                             Scriptable thisObj, Object[] args)
+    {
+        if (!f.hasTag(FTAG)) {
+            return super.execIdCall(f, cx, scope, thisObj, args);
+        }
+        int id = f.methodId();
+        switch (id) {
+          case Id_constructor:
+            throw Context.reportRuntimeError("Direct call is not supported");
+        }
+        throw new IllegalArgumentException(String.valueOf(id));
+    }
+
+// #string_id_map#
+
+    protected int findPrototypeId(String s)
+    {
+        int id;
+// #generated# Last update: 2004-09-08 12:02:41 CEST
+        L0: { id = 0; String X = null;
+            if (s.length()==11) { X="constructor";id=Id_constructor; }
+            if (X!=null && X!=s && !X.equals(s)) id = 0;
+        }
+// #/generated#
+        return id;
+    }
+
+    private static final int
+        Id_constructor          = 1,
+        MAX_PROTOTYPE_ID        = 1;
+
+// #/string_id_map#
+}