Data-driven runtime styling for Node

[1ec5]

Basic runtime styling support was added to the Node module in #5318, but it doesn’t include property functions, which were implemented in mbgl in #7372. Currently, you can set property functions via style JSON. This issue tracks adding a way to manipulate them via the runtime styling API.

/cc @kkaefer @bsudekum

[jfirebaugh]

Can you say more specifically what you see as missing? The existing bindings pass most of the tests in https://github.com/mapbox/mapbox-gl-js/tree/master/test/integration/render-tests/runtime-styling, which include tests that use property functions.

[1ec5]

@jfirebaugh, I was referring to passing property functions into setPaintProperty() from the JavaScript side, going off the discussion in #7372 (comment). From a cursory look at node_map.cpp, it didn’t look like there was support for property functions, but if there’s conversion magic going on, we can close this ticket and call it done. 😄

[jfirebaugh]

Yep, that should work -- it's handled by the logic in style/conversion/function.hpp.