[v8-embedding] - Exposing result-set as an array in javascript

[Abhishek Singh]

I'm exposing C++ objects in javascript as a map using NamedPropertyHandlerConfiguration. So operations like below in javascript are intercepted by Getter/Setter/Deleter callbacks as defined in v8 binding code.

var obj = beer-sample["test_key2"]; // "beer-sample" is the keyword I'm exposing to JS from v8 binding code, it's encapsulating a C++ object

beer-sample["test_key1"] = "test_value1";

delete beer-sample["test_key3"];

Next step in this use-case I'm looking at is to enumerate result-set obtained. I've looked at GenericNamedPropertyEnumeratorCallback but that doesn't look to be helpful in this case. Signature looks like below:

void GenericNamedPropertyEnumeratorCallback(PropertyCallbackInfo<Array>& info);

It doesn't allow to pass Local<Name> property to it like Getter/Setter/Deleter callback and I understand Enumerator Callback's purpose is different by looking at the unit tests within V8 code.

===

Here is what I'm specifically after:

In javascript a user could write something like this:

```

var queryResult = queryObj["select * from `beer-sample`;"]

var resultLength = queryResult.length;

for (var i = 0; i < resultLength; i++) {

   //Do some computation and bookkeeping on each row 

   log(queryResult[i]);

}

```

So queryResult needs to of type PropertyCallbackInfo<Array> type and I'm not sure correct way to do this. What would be the recommended to achieve this?

Thanks,

Abhishek

--

Thanks,

Abhishek Singh

[Jochen Eisinger]

The enumerator callback returns what is used for eg Object.getOwnPropertyNames(queryObj)

If you want queryObj["foo"] to return an array, just create on in the getter callback and set it as return value. The getter takes a PropertyCallbackInfo<Value> and Array drives from Value

Best
Jochen

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