33 lines
1.3 KiB
JavaScript
33 lines
1.3 KiB
JavaScript
import * as delta from 'lib0/delta'
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import { createInsertSetFromStructStore, createDeleteSetFromStructStore, diffIdSet, mergeIdSets } from './ids.js'
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import { createDiffRenderer } from './Renderer.js'
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import { computeModifiedFromItems } from '../ynode.js'
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/**
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* @param {Doc} v1
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* @param {Doc} v2
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* @return {delta.DeltaBuilderAny}
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*/
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export const diffDocsToDelta = (v1, v2, { renderer = createDiffRenderer(v1, v2) } = {}) => {
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const insertDiff = diffIdSet(createInsertSetFromStructStore(v2.store, false), createInsertSetFromStructStore(v1.store, false))
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const deleteDiff = diffIdSet(createDeleteSetFromStructStore(v2.store), createDeleteSetFromStructStore(v1.store))
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// don't render items that have been inserted and then deleted
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const insertsOnly = diffIdSet(insertDiff, deleteDiff)
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const itemsToRender = mergeIdSets([insertsOnly, deleteDiff])
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/**
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* @type {Map<YNode, Set<string|null>>}
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*/
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const changedTypes = computeModifiedFromItems(v2.store, itemsToRender)
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const d = delta.create()
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v2.share.forEach((type, typename) => {
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const typeConf = changedTypes.get(type)
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if (typeConf) {
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const shareDelta = type.toDelta({
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renderer, itemsToRender, retainDeletes: true, modified: changedTypes, deep: true
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})
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d.modifyAttr(typename, shareDelta)
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}
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})
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return d
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}
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