Function getPosition

packages/@react-spectrum/ai/src/TokenField.tsx:593–620

(container: Element, node: Node, offset: number)

}

function getPosition(container: Element, node: Node, offset: number): Position {
  if (node === container) {
    return {index: offset, offset: 0};
  }

  let originalNode = node;
  while (node.parentNode !== container) {
    node = node.parentNode!;
  }

  let index = indexOfNode(node);
  if (node.nodeType === Node.ELEMENT_NODE) {
    let tokenNode = node.childNodes[1];
    if (originalNode === tokenNode) {
      // Cursor is inside the token.
      offset = offset > 0 ? (tokenNode?.textContent?.length ?? 0) : 0;
    } else if (originalNode === node) {
      // Cursor is inside the wrapper element.
      offset = offset <= 1 ? 0 : (tokenNode?.textContent?.length ?? 0);
    } else {
      // Cursor is on one of the zero width spaces.
      offset =
        originalNode === tokenNode.previousSibling ? 0 : (tokenNode?.textContent?.length ?? 0);
    }
    return {index, offset};
  }
  return {index, offset};
}

let isProgrammaticSelectionChange = false;