Unless we create mirrors as weak refs internally (i.e., maintain 1:1
with underlying foreign object reference), there is no easy solution.
And maintaining such weak refs is unnecessarily complex. "Foreign
object" call/access is mean to be just a "lightweight wrapper" based
access. That said, you can do the === on the foreign context itself. You
can call ScriptObjectMirror's eval to evaluate === test in that foreign
context. That would get right object identity.
-Sundar
On 12/22/2015 4:26 AM, Vivin Suresh Paliath wrote:
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.pali...@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.
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