Using === across different contexts

[Vivin Suresh Paliath]

One more thing I noticed is that apparently a new ScriptObjectMirror
instance is probably being created each time x is dereferenced, so "e.x ===
e.x" also returns "false".

On Mon, Dec 21, 2015 at 3:49 PM, Vivin Suresh Paliath <
vivin.paliath at gmail.com> wrote:

> I ran into an issue where === returns false even when both should be
> pointing to the same object. I'm assuming this is because one of the
> objects is wrapped by a ScriptObjectMirror, because it was defined in a
> different context.
>
> Here's some code that demonstrates this:
>
>         ScriptEngine engine = new
> NashornScriptEngineFactory().getScriptEngine(
>             new String[] { "-strict" }
>         );
>
>         try {
>             engine.eval("function Foo(src) { this.src = src }; var e = {
> x: new Foo(\"what\") };");
>
>             ScriptContext c = new SimpleScriptContext();
>             c.setBindings(engine.createBindings(),
> ScriptContext.ENGINE_SCOPE);
>
> c.getBindings(ScriptContext.ENGINE_SCOPE).putAll(engine.getBindings(ScriptContext.ENGINE_SCOPE));
>
>             System.out.println(engine.eval("var z = e.x; z === e.x;", c));
>         } catch(Exception e) {
>             throw new RuntimeException(e);
>         }
>
> This prints out "false". Is there a way around this? I am also explicitly
> copying over all the bindings from the parent scope into the new scope so
> that I have access to "e". Could this be the source of the problem, and if
> so, is there a better way to achieve what I'm trying to do?
>
> --
> Ruin untold;
> And thine own sadness,
> Sing in the grass,
> When eve has forgot, that no more hear common things that gleam and pass;
> But seek alone to lip, sad Rose of love and ruin untold;
> And thine own mother
> Can know it as I know
> More than another
> What makes your own sadness,
> Set in her eyes.
>
> map{@n=split//;$j.=$n[0]x$n[1]}split/:/,"01:11:02".
> ":11:01:11:02:13:01:11:01:11:01:13:02:12:01:13:01".
> ":11:04:11:06:12:04:11:01:12:01:13:02:12:01:14:01".
> ":13:01:11:03:12:01:11:04:12:02:11:01:11:01:13:02".
> ":11:03:11:06:11:01:11:05:12:02:11:01:11:01:13:02".
> ":11:02:12:01:12:04:11:06:12:01:11:04:12:04:11:01".
> ":12:03:12:01:12:01:11:01:12:01:12:02:11:01:11:01".
> ":13:02:11:01:02:11:01:12:02";map{print chr unpack"
> i",pack"B32",$_}$j=~m/.{8}/g
>



-- 
Ruin untold;
And thine own sadness,
Sing in the grass,
When eve has forgot, that no more hear common things that gleam and pass;
But seek alone to lip, sad Rose of love and ruin untold;
And thine own mother
Can know it as I know
More than another
What makes your own sadness,
Set in her eyes.

map{@n=split//;$j.=$n[0]x$n[1]}split/:/,"01:11:02".
":11:01:11:02:13:01:11:01:11:01:13:02:12:01:13:01".
":11:04:11:06:12:04:11:01:12:01:13:02:12:01:14:01".
":13:01:11:03:12:01:11:04:12:02:11:01:11:01:13:02".
":11:03:11:06:11:01:11:05:12:02:11:01:11:01:13:02".
":11:02:12:01:12:04:11:06:12:01:11:04:12:04:11:01".
":12:03:12:01:12:01:11:01:12:01:12:02:11:01:11:01".
":13:02:11:01:02:11:01:12:02";map{print chr unpack"
i",pack"B32",$_}$j=~m/.{8}/g