Function getEditorPath

packages/yjs-transform/src/location.ts:99–144

(sharedRoot: Y.XmlText, editorRoot: Node, yText: Y.XmlText)

}

export function getEditorPath(sharedRoot: Y.XmlText, editorRoot: Node, yText: Y.XmlText): Path {
  const yNodePath = [yText]
  while (yNodePath[0] !== sharedRoot) {
    const { parent: yParent } = yNodePath[0]

    if (!yParent) {
      throw new Error("yText isn't a descendant of root element")
    }

    if (!(yParent instanceof Y.XmlText)) {
      throw new Error('Unexpected y parent type')
    }

    yNodePath.unshift(yParent)
  }

  if (yNodePath.length < 2) {
    return []
  }

  let editorParent = editorRoot
  return yNodePath.reduce<Path>((path, yParent, idx) => {
    const yChild = yNodePath[idx + 1]
    if (!yChild) {
      return path
    }

    let yOffset = 0
    const currentDelta = yTextToInsertDelta(yParent)
    for (const element of currentDelta) {
      if (element.insert === yChild) {
        break
      }

      yOffset += typeof element.insert === 'string' ? element.insert.length : 1
    }

    if (Text.isText(editorParent)) {
      throw new Error('Cannot descent into editor text')
    }

    const [pathOffset] = yOffsetToEditorOffsets(editorParent, yOffset)
    editorParent = editorParent.children[pathOffset]
    return path.concat(pathOffset)
  }, [])
}