getSceneProperty function

Object? getSceneProperty(SceneNode node, String prop)

Read one authored property by the name a SceneNode.bindings entry keys it under — the table's reader, with the two shapes a binding sees differently: edges as their uniform value, a nested argument at its override else the child's default.

Implementation

Object? getSceneProperty(SceneNode node, String prop) =>
    switch (resolveSceneKey(node, prop)) {
      ScenePropertyKey(:var prop) => switch (prop.kind) {
        ScenePropKind.edges => (prop.read(node)! as SceneQuad).sides.first,
        ScenePropKind.size => sizeToWire(prop.read(node) as double?),
        _ => prop.read(node),
      },
      ScenePartKey(:var prop, :var part) when prop.kind == ScenePropKind.args =>
        switch (node) {
          SceneRefNode r =>
            r.args[part] ?? r.instance?.paramNamed(part)?.defaultValue,
          ExternalNode e => e.args[part],
          _ => null,
        },
      ScenePartKey(:var prop, :var part) when prop.kind == ScenePropKind.axes =>
        (prop.read(node)! as Map<String, double>)[part],
      ScenePartKey(:var prop, :var sideIndex) =>
        (prop.read(node)! as SceneQuad).sides[sideIndex],
      null => null,
    };