feat: support RNTuple

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

src/uproot_browser/plot.py

@@ -51,7 +51,7 @@ def plot(tree: Any) -> None:
 
 
 @plot.register
-def plot_branch(tree: uproot.TBranch) -> None:
+def plot_branch(tree: uproot.TBranch | uproot.models.RNTuple.RField) -> None:
     """
     Plot a single tree branch.
     """

src/uproot_browser/tree.py

@@ -52,6 +52,8 @@ def is_dir(self) -> bool:
             return True
         if isinstance(self.item, uproot.behaviors.TBranch.HasBranches):
             return len(self.item.branches) > 0
+        if isinstance(self.item, uproot.behaviors.RNTuple.HasFields):
+            return len(self.item.keys()) > 0
         return False
 
     def meta(self) -> MetaDict:
@@ -79,6 +81,8 @@ def children(self) -> list[UprootEntry]:
             }
         elif isinstance(self.item, uproot.behaviors.TBranch.HasBranches):
             items = {item.name for item in self.item.branches}
+        elif isinstance(self.item, uproot.behaviors.RNTuple.HasFields):
+            items = self.item.keys()
         else:
             items = {obj.name.split(";")[0] for obj in self.item.branches}
         return [
@@ -141,7 +145,7 @@ def _process_item_tfile(
 
 
 @process_item.register
-def _process_item_ttree(uproot_object: uproot.TTree) -> MetaDict:
+def _process_item_ttree(uproot_object: uproot.TTree | uproot.behaviors.RNTuple.RNTuple) -> MetaDict:
     """
     Given an tree, return a rich.tree.Tree output.
     """