function isSelectionAtLeafStart()

in src/component/selection/isSelectionAtLeafStart.js [16:46]

• 25 lines of code
• 4 McCabe index (conditional complexity)

function isSelectionAtLeafStart(editorState: EditorState): boolean {
  const selection = editorState.getSelection();
  const anchorKey = selection.getAnchorKey();
  const blockTree = editorState.getBlockTree(anchorKey);
  const offset = selection.getStartOffset();

  let isAtStart = false;

  blockTree.some(leafSet => {
    if (offset === leafSet.get('start')) {
      isAtStart = true;
      return true;
    }

    if (offset < leafSet.get('end')) {
      return leafSet.get('leaves').some(leaf => {
        const leafStart = leaf.get('start');
        if (offset === leafStart) {
          isAtStart = true;
          return true;
        }

        return false;
      });
    }

    return false;
  });

  return isAtStart;
}