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[relative-positions] add option to configure whether to follow redon insertions - #638

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This commit is contained in:
Kevin Jahns 2024-04-27 00:24:49 +02:00
parent 927c2369aa
commit ce43124ad0
2 changed files with 37 additions and 3 deletions
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18
src/utils/RelativePosition.js
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@ -8,6 +8,7 @@ import {
createID,
ContentType,
followRedone,
getItem,
ID, Doc, AbstractType // eslint-disable-line
} from '../internals.js'
@ -256,13 +257,24 @@ export const readRelativePosition = decoder => {
export const decodeRelativePosition = uint8Array => readRelativePosition(decoding.createDecoder(uint8Array))
/**
* Transform a relative position to an absolute position.
*
* If you want to share the relative position with other users, you should set
* `followUndoneDeletions` to false to get consistent results across all clients.
*
* When calculating the absolute position, we try to follow the "undone deletions". This yields
* better results for the user who performed undo. However, only the user who performed the undo
* will get the better results, the other users don't know which operations recreated a deleted
* range of content. There is more information in this ticket: https://github.com/yjs/yjs/issues/638
*
* @param {RelativePosition} rpos
* @param {Doc} doc
* @param {boolean} followUndoneDeletions - whether to follow undone deletions - see https://github.com/yjs/yjs/issues/638
* @return {AbsolutePosition|null}
*
* @function
*/
export const createAbsolutePositionFromRelativePosition = (rpos, doc) => {
export const createAbsolutePositionFromRelativePosition = (rpos, doc, followUndoneDeletions = true) => {
const store = doc.store
const rightID = rpos.item
const typeID = rpos.type
@ -274,7 +286,7 @@ export const createAbsolutePositionFromRelativePosition = (rpos, doc) => {
if (getState(store, rightID.client) <= rightID.clock) {
return null
}
const res = followRedone(store, rightID)
const res = followUndoneDeletions ? followRedone(store, rightID) : { item: getItem(store, rightID), diff: 0 }
const right = res.item
if (!(right instanceof Item)) {
return null
@ -298,7 +310,7 @@ export const createAbsolutePositionFromRelativePosition = (rpos, doc) => {
// type does not exist yet
return null
}
const { item } = followRedone(store, typeID)
const { item } = followUndoneDeletions ? followRedone(store, typeID) : { item: getItem(store, typeID) }
if (item instanceof Item && item.content instanceof ContentType) {
type = item.content.type
} else {

22
tests/relativePositions.tests.js
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@ -101,3 +101,25 @@ export const testRelativePositionAssociationDifference = tc => {
t.assert(posRight != null && posRight.index === 2)
t.assert(posLeft != null && posLeft.index === 1)
}
/**
* @param {t.TestCase} tc
*/
export const testRelativePositionWithUndo = tc => {
const ydoc = new Y.Doc()
const ytext = ydoc.getText()
ytext.insert(0, 'hello world')
const rpos = Y.createRelativePositionFromTypeIndex(ytext, 1)
const um = new Y.UndoManager(ytext)
ytext.delete(0, 6)
t.assert(Y.createAbsolutePositionFromRelativePosition(rpos, ydoc)?.index === 0)
um.undo()
t.assert(Y.createAbsolutePositionFromRelativePosition(rpos, ydoc)?.index === 1)
const posWithoutFollow = Y.createAbsolutePositionFromRelativePosition(rpos, ydoc, false)
console.log({ posWithoutFollow })
t.assert(Y.createAbsolutePositionFromRelativePosition(rpos, ydoc, false)?.index === 6)
const ydocClone = new Y.Doc()
Y.applyUpdate(ydocClone, Y.encodeStateAsUpdate(ydoc))
t.assert(Y.createAbsolutePositionFromRelativePosition(rpos, ydocClone)?.index === 6)
t.assert(Y.createAbsolutePositionFromRelativePosition(rpos, ydocClone, false)?.index === 6)
}