handleAddRule method

Implementation

void handleAddRule(int? id, Map<String, dynamic> params) {
  final ctx = dbgContext;
  if (ctx == null) {
    sendToFrontend(id, null);
    return;
  }

  final dynamic rawStyleSheetId = params['styleSheetId'];
  final String ruleText = (params['ruleText'] ?? '').toString();

  if (ruleText.trim().isEmpty) {
    sendToFrontend(id, JSONEncodableMap({'rule': {}}));
    return;
  }

  int? nodeId;
  if (rawStyleSheetId is int) {
    nodeId = ctx.getTargetIdByNodeId(rawStyleSheetId);
  } else if (rawStyleSheetId is String) {
    String sid = rawStyleSheetId;
    if (sid.startsWith('inline:')) {
      final String rest = sid.substring('inline:'.length);
      final int? nid = int.tryParse(rest);
      if (nid != null) {
        nodeId = ctx.getTargetIdByNodeId(nid);
      }
    } else {
      final int? nid = int.tryParse(sid);
      if (nid != null) {
        nodeId = ctx.getTargetIdByNodeId(nid);
      }
    }
  }

  if (nodeId == null) {
    sendToFrontend(id, JSONEncodableMap({'rule': {}}));
    return;
  }
  final BindingObject? obj = ctx.getBindingObject(Pointer.fromAddress(nodeId));
  if (obj is Element && obj is StyleElementMixin) {
    // Append text node with the rule; StyleElementMixin reacts and recalculates styles
    final Element styleEl = obj;
    final Document doc = styleEl.ownerDocument;
    final textNode = doc.createTextNode('\n$ruleText\n',
        BindingContext(doc.controller.view, doc.controller.view.contextId, allocateNewBindingObject()));
    styleEl.appendChild(textNode);
    // Respond with a minimal rule object
    sendToFrontend(id, JSONEncodableMap({'rule': {}}));
    return;
  }

  // Fallback: unsupported stylesheet target; no-op success
  sendToFrontend(id, JSONEncodableMap({'rule': {}}));
}