JsInterop Generator from webidl

[nick936]

Hi,
while playing with the new JsInterop feature i decided to write a code generator which generate the interfaces out of webidls fetched from https://html.spec.whatwg.org/ or the mozilla repository. Yesterday i started this littel project. It's a prototype and far away from being stable, but enough to use the generated interfaces for test purposes. I did a rather quick and dirty just to use the interfaces my internal test project and the code needs some refactoring. I used ANTLR4, javasoup and javapoet. You can find the sources in this github repo https://github.com/Nickel671/JsInteropGenerator. You can find the generated Interfaces here https://github.com/Nickel671/JsInteropGenerator/tree/master/target/generated-sources/gwt/org/niklas/elemental/Elemental/client/elements. If you are interested in this i will improve it.

[Stefano Ciccarelli]

http://www.gwtproject.org/articles/elemental.html

Is it the same?

Il giorno mer 1 apr 2015 alle 23:32 nick936 <nikl...@googlemail.com> ha scritto:

Hi,
while playing with the new JsInterop feature i decided to write a code generator which generate the interfaces out of webidls fetched from https://html.spec.whatwg.org/ or the mozilla repository. Yesterday i started this littel project. It's a prototype and far away from being stable, but enough to use the generated interfaces for test purposes. I did a rather quick and dirty just to use the interfaces my internal test project and the code needs some refactoring. I used ANTLR4, javasoup and javapoet. You can find the sources in this github repo https://github.com/Nickel671/JsInteropGenerator. You can find the generated Interfaces here https://github.com/Nickel671/JsInteropGenerator/tree/master/target/generated-sources/gwt/org/niklas/elemental/Elemental/client/elements. If you are interested in this i will improve it.

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[Ray Cromwell]

Yes, there is a version under development based on html5index.org (https://github.com/tidej/html5index)

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[nick936]

Hey,
i know you guys develop Elemental 2.0. It's only for the people how are interested in the meantime. But you are welcome to look at the code. ( Besides it's inspired by laziness ;) )

Am Donnerstag, 2. April 2015 10:15:28 UTC+2 schrieb Ray Cromwell:

Yes, there is a version under development based on html5index.org (https://github.com/tidej/html5index)

On Wed, Apr 1, 2015 at 8:39 PM, Stefano Ciccarelli <scicc...@gmail.com> wrote:

http://www.gwtproject.org/articles/elemental.html

Is it the same?

Il giorno mer 1 apr 2015 alle 23:32 nick936 <nikl...@googlemail.com> ha scritto:

Hi,
while playing with the new JsInterop feature i decided to write a code generator which generate the interfaces out of webidls fetched from https://html.spec.whatwg.org/ or the mozilla repository. Yesterday i started this littel project. It's a prototype and far away from being stable, but enough to use the generated interfaces for test purposes. I did a rather quick and dirty just to use the interfaces my internal test project and the code needs some refactoring. I used ANTLR4, javasoup and javapoet. You can find the sources in this github repo https://github.com/Nickel671/JsInteropGenerator. You can find the generated Interfaces here https://github.com/Nickel671/JsInteropGenerator/tree/master/target/generated-sources/gwt/org/niklas/elemental/Elemental/client/elements. If you are interested in this i will improve it.

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[Goktug Gokdogan]

Cool stuff! I'll definitely take a look.

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[Jens]

A few notes, after a quick look:

- Generated interfaces should be public

- Some interfaces have multiple methods with the same name but different parameters, e.g. Window.alert() and Window.alert(String msg). That seems to cause a compile error that "alert" is already defined. There are a couple of other interface with similar errors (mostly the Canvas stuff if I remember correctly). 

- I'm not a JS expert but could it be that things like WindowBase64 should not have @JsType(prototype="WindowBase64") applied as its just an interface/mixin that does not exist on its own? In the IDL it also has a marker "NoInterfaceObject".

-- J.

[Rene Hangstrup Møller]

Hi

I did a similar experiment a while ago, but abandoned it due to the missing support for overloads in JsInterop and I did not come up with a pleasing solution for constructors. Many parts of the DOM API use method overloading (fx the canvas API) and constructors -(fx to create a Path2D object)

Feel free to take whatever from it if you find anything useful.

https://github.com/rhmoller/webidl2gwt

It contains:
- a scraper that extract webidl snippets from https://html.spec.whatwg.org
- a quick and dirty and incomplete webidl parser based on an Antlr4 grammar
- an example with a hacked version of GWT where the method overloading guard has been removed. It does some painting using Canvas.
- a factory approach for constructing new instances of JsInterop types.

[Rene Hangstrup Møller]

oh and I think I had to massage the extracted webidl snippets, because not all of them are syntactically valid.

/Rene

[nick936]

Thank you Jens for your feedback. I expected that there is someting like method overloading because in webidl you have many optional  and union parameters.
Yes currently i don't support any markers. My current problem is how to handle union types propertly and unknown idl interfaces.At the moment i read the specs and try to find some solutions http://www.w3.org/TR/2012/WD-WebIDL-Java-20120207/ https://docs.google.com/document/d/1tir74SB-ZWrs-gQ8w-lOEV3oMY6u6lF2MmNivDEihZ4/edit.

Rene i use the IDL grammar from http://www.w3.org/TR/WebIDL/#idl-grammar and i didn't find any syntax errors in the webidls from whatwg. But i will defintly take a look.

[Goktug Gokdogan]

In practice, the overloading is only a problem if the interface is implemented by a java class. I'm already planning to relax the rules so that the check for overloads will fail only if there is a java implementor of the interface.

For constructors and static methods see: https://groups.google.com/d/topic/google-web-toolkit-contributors/L6uh96NcZtE/discussion (not implemented yet)

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[Bademus l.]

Hello,

Are you willing to generate JsInterprop for ChromeExtension API too?

thanks and sorry for offtopic,