resolveNode function

Morphic resolveNode(dynamic node)

Resolves a Morphic tree by expanding all Component instances found.

FragmentMorphic nodes are preserved in the resolved tree — they are NOT flattened here. Flattening happens at the DOM level in createDom and _patchChildren in diff.dart, where the parent element context is available. Preserving fragments in the resolved tree lets the differ compare prev/next fragments at the same position accurately.

Implementation

Morphic resolveNode(dynamic node) {
  // ── Component ────────────────────────────────────────────────────────────
  if (node is Component) {
    node.attach(RenderContext.runtime);

    final rendered = RenderContext.runWithComponent(node, () {
      return node.render();
    });

    final resolved = resolveNode(rendered);
    RenderContext.runtime.registerComponentTree(node, resolved);
    return resolved;
  }

  // ── FragmentMorphic ──────────────────────────────────────────────────────
  if (node is FragmentMorphic) {
    final resolvedChildren = <Morphic>[];
    for (final child in node.children) {
      resolvedChildren.add(resolveNode(child));
    }
    return FragmentMorphic(children: resolvedChildren, key: node.key);
  }

  // ── ElementMorphic ───────────────────────────────────────────────────────
  if (node is ElementMorphic) {
    final resolvedChildren = <Morphic>[];
    for (final child in node.children) {
      final resolved = resolveNode(child);
      resolvedChildren.add(resolved);
    }
    return ElementMorphic(
      tag: node.tag,
      attributes: node.attributes,
      children: resolvedChildren,
      key: node.key,
    );
  }

  // ── Primitives ───────────────────────────────────────────────────────────
  if (node is TextMorphic) return node;
  if (node is String) return TextMorphic(node);
  if (node is int || node is double) return TextMorphic(node.toString());

  throw UnsupportedError('Unknown node type: ${node.runtimeType}');
}