How to write an IDL describing a deeply namespaced enum

[Kristina Chodorow]

I'm trying to write an IDL to describe http://bulletphysics.org/Bullet/BulletFull/btSoftBody_8h_source.html#l00486, basically:

class btSoftBody {

  struct Joint {

    struct eType {

      enum _ {

        Linear, Angular, Contact

      };

    };

  };

}; 

However, I can't figure out how to express this in my .idl file. Based on https://kripken.github.io/emscripten-site/docs/porting/connecting_cpp_and_javascript/WebIDL-Binder.html#enums, I tried:

enum btSoftBody_Joint_eType__ {

  "btSoftBody::Joint::eType::Linear",

  "btSoftBody::Joint::eType::Angular",

  "btSoftBody::Joint::eType::Contact"

};

[Prefix="btSoftBody::Joint::"]

interface eType {

};

... // So on for Joint and btSoftBody.

But that gives me:

Traceback (most recent call last):

  File "/Users/k/emsdk_portable/emscripten/incoming/tools/webidl_binder.py", line 709, in <module>

    raise Exception("Illegal enum value %s" % value)

So then I tried:

enum btSoftBody_Joint_eType__ {

  "eType::Linear",

  "eType::Angular",

  "eType::Contact"

};

This gets further (it generates the cpp bindings) but when it tries to compile them, the types don't resolve to anything:

glue.cpp:4539:1: error: unknown type name 'btSoftBody_Joint_eType__'

btSoftBody_Joint_eType__ EMSCRIPTEN_KEEPALIVE emscripten_enum_btSoftBody_Joint_eType___Linear() {

^

glue.cpp:4539:26: error: expected unqualified-id

btSoftBody_Joint_eType__ EMSCRIPTEN_KEEPALIVE emscripten_enum_btSoftBody_Joint_eType___Linear() {

                         ^

/Users/k/emsdk_portable/emscripten/incoming/system/include/emscripten/emscripten.h:64:30: note: expanded from macro 'EMSCRIPTEN_KEEPALIVE'

#define EMSCRIPTEN_KEEPALIVE __attribute__((used))

                             ^

glue.cpp:4542:1: error: unknown type name 'btSoftBody_Joint_eType__'

...

Does anyone know what I'm doing wrong?  Or how to express this?

[Alon Zakai]

Hmm, this looks like a current limitation of the webidl binder,

https://github.com/kripken/emscripten/blob/master/tools/webidl_binder.py#L695

Seems like it only handles one "::" (or none). In principle it should be straightforward to generalize it, although it has some special logic to check if the name before the "::" is a class or not, and it's not immediately obvious to me how that would work for more elements.

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[Kristina Chodorow]

Okay, thanks. It's probably easier just to skip the IDL and write a C++ wrapper directly.

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