Playground

What this page will eventually be

A two-pane Cairn workbench, all client-side:

A .crn editor on the left, with syntax highlighting and inline diagnostics from the Cairn LSP.
A target selector (--edition java|bedrock, --target <version>) and a compile button.
A right-hand pane that flips between:
- Resolved IR — the block-array IR after phase evaluation.
- Diagnostics — lint output in the same “what is wrong / valid candidates / suggested fix” shape used by cairn and the LSP (Lint).
- Bytes — the per-edition NBT / schematic bytes the compiler would emit.

The lift loop (Ecosystem Interop) will live here too: drop a .litematic or .mcstructure file in and watch the compiler produce a raw-centric .crn plus a voxel diff against the source.

A sample to read in the meantime

@cairn 2026.06
@requires version>=1.20

theme medieval:
  slot wall  -> @cobblestone
  slot roof  -> @spruce_stairs

struct cottage size=9x7
  floor  mat_slot=floor
  walls  class=outer mat_slot=wall height=4
  door   side=front at=center
  window class=small side=front offset=2 y=2 size=2x2 sym=true
  roof   kind=gable mat_slot=roof overhang=1

Track progress on the Cairn GitHub repository — the playground unlocks the moment cairn-wasm exposes a compile() binding.