Support dashed attributes

[kevinresol]

https://github.com/react-spring/react-three-fiber/blob/master/api.md#piercing-into-nested-properties

<mesh rotation-x={1} />

I vaguely recall that hxx supports dotted attributes e.g. <mesh rotation.x={1}/> could we exploit that and make it generate dashes? Edit: ignore this, as dot syntax has its own semantics

[kevinresol]

And this drills down to some nasty dynamic typings. For example, the following code modifies the opacity field of material, but only some material types (e.g. StandardMeshMaterial) would have that field.

<mesh material-opacity={0.5} />

perhaps it is easier to just allow untyped in hxx, though not sure what the syntax should be...

<mesh untyped material-opacity={0.5} />

[kevinresol]

Currently I hacked the custom attribute regex with this:

class Setup {
	public static function all() {
		var NAMELESS = '';
		var def = macro class BaseAttr {
			@:hxxCustomAttributes(~/(.*-.*)/)
			@:optional var $NAMELESS:Dynamic;
		}
		def.pack = ['react', 'three_fiber'];
		def.kind = TDStructure;
		Context.defineType(def);
	}
}

and extending this BaseAttr would do what I needed

[back2dos]

Moved to coconut.react-core