overriding standard types

[nadako]

I tried to add haxe.io.Bytes implementation, but there's a problem that in a macro it also tries to use the overriden class and then complains about using js.node.Buffer in a macro context.

What can we do with that? One option is to just move nodejs sys stuff into Haxe itself (and fence with #if nodejs), another one is to make it possible to override types only for target output context, not the macro one.

Also, @:coreApi metadata doesn't work on our overriden types.

cc @Simn @ncannasse

[nadako]

Bytes implementation 72d7b83

[nadako]

Oh, and thanks to @andyli and Travis CI we can see that @:coreApi actually worked in 3.2.0: https://travis-ci.org/HaxeFoundation/hxnodejs/jobs/79463579

[eduardo-costa]

I didn't get yet whay @coreapi does :)
Em 09/09/2015 10:05, "Dan Korostelev" notifications@github.com escreveu:

Oh, and thanks to @andyli https://github.com/andyli and Travis CI we
can see that @:coreApi actually worked in 3.2.0:
https://travis-ci.org/HaxeFoundation/hxnodejs/jobs/79463579

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#42 (comment)
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[nadako]

@eduardo-costa it checks whether all fields are defined correctly in the overriden std class. it's used in haxe std for providing target implementations. it does check field existance, type, access modifiers, method signatures, etc.

[eduardo-costa]

Got it! Thanks!
We should describe more of thia in he docs!
Em 09/09/2015 11:23, "Dan Korostelev" notifications@github.com escreveu:

@eduardo-costa https://github.com/eduardo-costa it checks whether all
fields are defined correctly in the overriden std class. it's used in haxe
std for providing target implementations. it does check field existance,
type, access modifiers, method signatures, etc.

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#42 (comment)
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[ncannasse]

Yes I'm aware of the issue with Bytes redefinition. I actually opened HaxeFoundation/haxe#4249 because of that. Not sure if that's the right solution or not.

I actually thing we need to find better ways for libraries to override/implement some std classes as well as configure which implementation is used depending on the compiled platform (in a safe manner, ie like we do for @:coreApiin stdlib)

[waneck]

I wish we implemented the _std magic for all classpaths - not just the std classpath

[ncannasse]

This currently breaks haxe.io.BytesBuffer compilation, and breaks some WebGL code I'm having in Node Webkit as well (since I need to have Bytes that maps to JS ArrayBuffer). Should we not drop the haxe.io.Bytes <-> NodeBuffer support since it seems recent NodeJS version does uses ArrayBuffer ? (I didn't test the later)

[ncannasse]

Up again : should we remove this and instead add NodeBuffer <-> Bytes conversion (in NodeBuffer class) since they are both based on ArrayBuffer but uses different APIs ?

[nadako]

To be honest, I'd remove anything but node.js externs (to reduce scope of this particular lib), and then make a separate lib that provides sys stuff.

[clemos]

@nadako +1

[ncannasse]

Maybe, but that just moves the problem away, no ?
I think it would be nice for Haxe users to have a crossplatform sys API for Node. Even more if that's a complex problem to solve so that users don't have to reinvent the wheel.

But looking at the Buffer API it seems there's no way to easy convert from/to ArrayBuffer (with no copying being done in the process). I don't then understand why they say that in 4.0+, Buffer is backed by UInt8Array. Unless there's a trick, can Node users confirm this ?

If there's no easy way, I agree we should move it out of hxnodejs for now, until we come up with a solution.

[nadako]

Looking at this code: https://github.com/nodejs/node/blob/master/lib/buffer.js#L43-L62, it seems that Buffer actually IS Uint8Array