[webkit-dev] Accessing WebKit JS binding classes from non-WebKit JavaScript Core applications?

Eric Seidel eric at webkit.org
Tue Apr 27 16:04:30 PDT 2010

Various WebKit ports expose different bindings.  The JS bindings are
only exposed to scripts on pages run inside WebKit.

If you have your own separate javascript environment, you would need
to set up your own custom bindings for that environment.  We don't
really provide clean APIs for that, however, there has been talk over
the years of taking the bindings/scripts and making it possible for
clients of WebKit to generate JSC-API compatible autogenerated
bindings wrapping their own implementation objects.

You'd still have to write your own implementation objects which talked
to the right pieces of WebKit/WebCore however.

I think you'll run into a world of pain if you try and just expose
guts of WebCore to clients outside of WebCore w/o having gone through
the normal WebCore parsing mechanisms and created a Page, Frame,
Client objects, etc.

Anyway, best of luck and we look forward to seeing your contributions.


On Tue, Apr 27, 2010 at 3:56 PM, Josh Shagam <Joshua.Shagam at am.sony.com> wrote:
> Thanks.  I apologize for mincing terminology - I'm not particularly versed
> in how WebKit is put together, where WebKit ends and JavaScriptCore begins,
> etc., and I've mostly been banging my head against this based on looking at
> work that some of my coworkers have done. :)
> I should be more specific that we are in fact linking against WebKit and so
> we will have the implementations available.  We are actually using full
> WebKit for another part of the system as well, but we'd like to be able to
> access WebKit's JS bindings from outside of the WebKit view.
> It looks like bindings/scripts bit will help me get on the right track, in
> any case.  Thanks for the pointer.
> Eric Seidel wrote:
> DerivedSources are generated from here:
> http://trac.webkit.org/browser/trunk/WebCore/DerivedSources.make
> I think what your'e thinking of as DerivedSources is actually just the
> javascript bindings, which will be useless to you w/o the actual
> implementations in WebCore.
> If for some reason you wanted to write your own custom bindings which
> use JSC's public API instead of the internal one which WebCore uses,
> you could make your own generator script:
> http://trac.webkit.org/browser/trunk/WebCore/bindings/scripts/
> You can see examples of those scripts being run in DerivedSources.make
> or in run-bindings-tests:
> http://trac.webkit.org/browser/trunk/WebKitTools/Scripts/run-bindings-tests
> In short, this is not a supported configuration. :)  I'm also not
> really sure it's on topic for this list.
> Best of luck!
> -eric
> On Tue, Apr 27, 2010 at 3:44 PM, Josh Shagam <Joshua.Shagam at am.sony.com>
> wrote:
> Hi, I'm working on a project which makes use of JavaScriptCore as a
> scripting engine outside of WebKit.  It would be very helpful to us if we
> could get access to the DOMParser and XMLSerializer classes which are in
> WebKit's DerivedSources area.  However, it seems that those libraries are
> using JavaScript Core's internal/private API (JSC::ExecState, JSC::Value,
> etc.) rather than the public interface expected by external users of
> JavaScript Core.
> We'd also like to avoid pulling in the internal WebKit headers anyway, as
> this would complicate our build system (for example, we'd like to be able to
> do this just using the header files provided by Ubuntu's libwebkit-dev
> package).  I'm fine with writing forward-declaration classes and stub
> methods for the purpose of letting the C++ linker figure it all out, but
> JSC::JSValue seems to get in the way of this idea, since the
> getConstructor() methods on the libraries we want return it by value rather
> than by reference (and it doesn't appear to be a simple reinterpret_cast
> like it is for the other public-API classes).
> Is there some official way that we can get at WebKit's DerivedSources
> library functionality in a non-WebKit JavaScript Core application, or can
> anyone think of some tricky-but-relatively-clean way to do it that doesn't
> involve our app having to see JSC's internal API?
> Thanks in advance.
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