Function getYTarget

packages/yjs-transform/src/location.ts:20–59

(yRoot: Y.XmlText, editorRoot: Node, path: Path)

}

export function getYTarget(yRoot: Y.XmlText, editorRoot: Node, path: Path): YTarget {
  if (path.length === 0) {
    throw new Error('Path has to a have a length >= 1')
  }

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

  const [pathOffset, ...childPath] = path

  const yOffset = editorPathOffsetToYOffset(editorRoot, pathOffset)
  const targetNode = editorRoot.children[pathOffset]

  const delta = yTextToInsertDelta(yRoot)
  const targetLength = getEditorNodeYLength(targetNode)

  const targetDelta = sliceInsertDelta(delta, yOffset, targetLength)
  if (targetDelta.length > 1) {
    throw new Error("Path doesn't match yText, yTarget spans multiple nodes")
  }

  const yTarget = targetDelta[0]?.insert
  if (childPath.length > 0) {
    if (!(yTarget instanceof Y.XmlText)) {
      throw new Error("Path doesn't match yText, cannot descent into non-yText")
    }

    return getYTarget(yTarget, targetNode, childPath)
  }

  return {
    yParent: yRoot,
    textRange: { start: yOffset, end: yOffset + targetLength },
    yTarget: yTarget instanceof Y.XmlText ? yTarget : undefined,
    editorParent: editorRoot,
    editorTarget: targetNode,
    targetDelta,
  }
}

export function yOffsetToEditorOffsets(
  parent: Element,