pleroma/app/soapbox/features/compose/editor/utils/get-selected-node.ts

/*
MIT License

Copyright (c) Meta Platforms, Inc. and affiliates.

This source code is licensed under the MIT license found in the
LICENSE file in the /app/soapbox/features/compose/editor directory.
*/

import { $isAtNodeEnd } from '@lexical/selection';
import { ElementNode, RangeSelection, TextNode } from 'lexical';

export const getSelectedNode = (
  selection: RangeSelection,
): TextNode | ElementNode =>  {
  const anchor = selection.anchor;
  const focus = selection.focus;
  const anchorNode = selection.anchor.getNode();
  const focusNode = selection.focus.getNode();
  if (anchorNode === focusNode) {
    return anchorNode;
  }
  const isBackward = selection.isBackward();
  if (isBackward) {
    return $isAtNodeEnd(focus) ? anchorNode : focusNode;
  } else {
    return $isAtNodeEnd(anchor) ? focusNode : anchorNode;
  }
};