[Feature Request] Compound type support

[aprock]

Great project!

I'm the owner of DuckDB.dart and we're exploring wasm support. I was able to use this to load in the duckdb-wasm binaries, however the bindings fail due to the lack of compound types (struct, union, and array), and const constructors for the primitives.

Any plans to add this support?

here is my ffi generated file with specific examples below of what fails.

final class duckdb_date_struct extends ffi.Struct {
  @ffi.Int32()
  external int year;

  @ffi.Int8()
  external int month;

  @ffi.Int8()
  external int day;
}
...
final class duckdb_string_t extends ffi.Struct {
  external UnnamedUnion1 value;
}

final class UnnamedUnion1 extends ffi.Union {
  external UnnamedStruct1 pointer;

  external UnnamedStruct2 inlined;
}
...
final class UnnamedStruct1 extends ffi.Struct {
  @ffi.Uint32()
  external int length;

  @ffi.Array.multi([4])
  external ffi.Array<ffi.Char> prefix;

  external ffi.Pointer<ffi.Char> ptr;
}

[vm75]

Thanks @aprock
I will have a go at it this winter.

DuckDB.dart is a cool project as well :)

[CaptainDario]

@vm75, this would be awesome.
I am trying to create some simple bindings for the onnx runtime for Dart.
For this, it would be awesome to have web support!

[CaptainDario]

@vm75 sorry for pinging you, but I wanted to ask you if this is still something you want to work on or if I should rather look for other solutions.

[vm75]

I did spend a lot of time trying to figure it, but I don't have a solution. Arrays of base types may be easier, but I couldn't figure that out either. I will keep trying, but cannot promise any timeline. You may want to explore other options, sorry.

…

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[CaptainDario]

Thank you for getting back to me and thank you for trying!

It would be awesome to get this working as it would greatly reduce the maintenance burden on the web.