Function yOffsetToEditorOffsets

packages/yjs-transform/src/location.ts:61–97

(
  parent: Element,
  yOffset: number,
  opts: { assoc?: number; insert?: boolean } = {},
)

}

export function yOffsetToEditorOffsets(
  parent: Element,
  yOffset: number,
  opts: { assoc?: number; insert?: boolean } = {},
): [number, number] {
  const { assoc = 0, insert = false } = opts

  let currentOffset = 0
  let lastNonEmptyPathOffset = 0
  for (let pathOffset = 0; pathOffset < parent.children.length; pathOffset++) {
    const child = parent.children[pathOffset]
    const nodeLength = Text.isText(child) ? child.text.length : 1

    if (nodeLength > 0) {
      lastNonEmptyPathOffset = pathOffset
    }

    const endOffset = currentOffset + nodeLength
    if (nodeLength > 0 && (assoc >= 0 ? endOffset > yOffset : endOffset >= yOffset)) {
      return [pathOffset, yOffset - currentOffset]
    }

    currentOffset += nodeLength
  }

  if (yOffset > currentOffset + (insert ? 1 : 0)) {
    throw new Error('yOffset out of bounds')
  }

  if (insert) {
    return [parent.children.length, 0]
  }

  const child = parent.children[lastNonEmptyPathOffset]
  const textOffset = Text.isText(child) ? child.text.length : 1
  return [lastNonEmptyPathOffset, textOffset]
}

export function getEditorPath(sharedRoot: Y.XmlText, editorRoot: Node, yText: Y.XmlText): Path {
  const yNodePath = [yText]