thanks, I'm struggling between function() { return ( "expression" ) } and
running a script like: with(myContextProxy){ "expression" }. The latter
allows me to handle this.x and x resolution separately as well but has
other drawbacks (this is still not the object I want it to be so I cant put
it into a storage, also functions created in the expression will store the
wrong 'this'... so its not an easy issue :)
2019. június 22., szombat 5:00:52 UTC+2 időpontban J Decker a következőt
írta:
>
>
> Sorry I did reflect that there's probably cases of simpler expessions.
> You could limit it to just no semicolons, and only allow commas, then you
> could just put it in a `()=>(/*expression without return*/)`
> but that doesn't let you pass a this.
>
> so you could make a `function() { return ` + (your expression ) + ` } `
> could get a 'this'.
> In the V8 engine though, args do have 'Holder()' and 'This()' and I'm not
> entirely sure how they differ, but most of my code is actually using
> Holder() to unwrap and get my object from.
>
>
>> But; go go back to the start, what value would you want to return from a
>> constructor other than the constructed 'this'?
>>
>>
>> On Fri, Jun 21, 2019 at 2:56 AM Zoltan B <[email protected] <javascript:>>
>> wrote:
>>
>>> Thank you!
>>>
>>> Also, In the case I'm running a Script (and not a function), if I write
>>> "myvariable" or "this.myvariable" then is there a way to distuingish
>>> between the two in the C++ side? Currently how I'm using it is like this:
>>> The context the script runs in has a global object with my template, so
>>> that I can provide external name resolution for contexts. However
>>> "myvariable" and "this.myvariable" both call the same global object, so if
>>> I could distuingish between the two, I could provide separate name
>>> resolution for 'this' and contextual variables.
>>>
>>> 2019. június 21., péntek 10:01:47 UTC+2 időpontban Caitlin Potter a
>>> következőt írta:
>>>>
>>>> No, that method would still require a return statement. Getting rid of
>>>> the return statement requirement would need a new API, or transforming the
>>>> source program before using it.
>>>>
>>>> On Jun 21, 2019, at 3:27 AM, Zoltan B <[email protected]> wrote:
>>>>
>>>> Thanks for your answer! :)
>>>>
>>>> In the (1) solution of yours, is there a way to be able to create
>>>> functions that behave like scripts? I mean, that if I write onclick="1+1",
>>>> then if I parse and run "1+1" as a function it would return 2 without
>>>> using
>>>> the "return" keyword (e.g.: "return 1+1")?
>>>>
>>>> 2019. június 20., csütörtök 16:04:53 UTC+2 időpontban Caitlin Potter a
>>>> következőt írta:
>>>>>
>>>>> I don’t believe you can do exactly what you want here, as there are
>>>>> two parts:
>>>>>
>>>>> 1) getting `this` set properly. I believe you should be able to use
>>>>> `CompileFunctionInContext()` to this effect, which is used to provide
>>>>> implicit arguments to DOM onxxx=“script...” handlers. I believe you can
>>>>> then make `this` whatever you want in that function. Return statements
>>>>> would still be legal, as they are in DOM events, though.
>>>>>
>>>>> 2) completion value of the script. This is trickier, as the v8 API
>>>>> does not expose a way to run the AST rewriter on arbitrary functions
>>>>> afaict. It may be possible to introduce an API for this, if it’s
>>>>> important.
>>>>>
>>>>> You might be able to take a third option, transforming the code with a
>>>>> custom Babel plugin before passing it to v8 (at runtime), and providing
>>>>> the
>>>>> sourcemap info along with it for debugging purposes.
>>>>>
>>>>> On Jun 20, 2019, at 9:49 AM, Zoltan B <[email protected]> wrote:
>>>>>
>>>>> Any ideas? :)
>>>>>
>>>>> 2019. június 7., péntek 13:16:08 UTC+2 időpontban Zoltan B a
>>>>> következőt írta:
>>>>>>
>>>>>> Hi!
>>>>>>
>>>>>> Is there a way to provide value for the 'this' keyword, when I'm
>>>>>> running a v8 Script?
>>>>>>
>>>>>> An alternative would be to compile the code as a function instead,
>>>>>> and provide 'this' when calling it trough 'recv', but then I would have
>>>>>> other issues: running a script like this: "1+1" would not return 2 as a
>>>>>> result, as I would have to explicitly put a "return" in front of "1+1",
>>>>>> so
>>>>>> the function will return the script's value. This seems to be error
>>>>>> prone,
>>>>>> not to mention that script locations will skew when viewed from
>>>>>> DevTools.
>>>>>> Using "return eval('1+1')" would work, but it kills performance due to
>>>>>> the
>>>>>> eval.
>>>>>>
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