lib0
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> Monorepo of isomorphic utility functions
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JavaScript
/**
* @beta this API is about to change
*
* ## Mutability
*
* Deltas are mutable by default. But references are often shared, by marking a Delta as "done". You
* may only modify deltas by applying other deltas to them. Casting a Delta to a DeltaBuilder
* manually, will likely modify "shared" state.
*/
import * as list from '../list.js'
import * as object from '../object.js'
import * as equalityTrait from '../trait/equality.js'
import * as fingerprintTrait from '../trait/fingerprint.js'
import * as arr from '../array.js'
import * as fun from '../function.js'
import * as s from '../schema.js'
import * as error from '../error.js'
import * as math from '../math.js'
import * as rabin from '../hash/rabin.js'
import * as encoding from '../encoding.js'
import * as buffer from '../buffer.js'
import * as patience from '../diff/patience.js'
import * as prng from '../prng.js'
/**
* @typedef {{
* insert?: string[]
* insertAt?: number
* delete?: string[]
* deleteAt?: number
* format?: Record<string,string[]>
* formatAt?: number
* }} Attribution
*/
/**
* @type {s.Schema<Attribution>}
*/
export const $attribution = s.$object({
insert: s.$array(s.$string).optional,
insertAt: s.$number.optional,
delete: s.$array(s.$string).optional,
deleteAt: s.$number.optional,
format: s.$record(s.$string, s.$array(s.$string)).optional,
formatAt: s.$number.optional
})
/**
* @typedef {s.Unwrap<$anyOp>} DeltaOps
*/
/**
* @typedef {{ [key: string]: any }} FormattingAttributes
*/
/**
* @typedef {{
* type: 'delta',
* name?: string,
* attrs?: { [Key in string|number]: DeltaAttrOpJSON },
* children?: Array<DeltaListOpJSON>
* }} DeltaJSON
*/
/**
* @typedef {{ type: 'insert', insert: string|Array<any>, format?: { [key: string]: any }, attribution?: Attribution } | { delete: number } | { type: 'retain', retain: number, format?: { [key:string]: any }, attribution?: Attribution } | { type: 'modify', value: object }} DeltaListOpJSON
*/
/**
* @typedef {{ type: 'insert', value: any, prevValue?: any, attribution?: Attribution } | { type: 'delete', prevValue?: any, attribution?: Attribution } | { type: 'modify', value: DeltaJSON }} DeltaAttrOpJSON
*/
/**
* @typedef {TextOp|InsertOp<any>|DeleteOp|RetainOp|ModifyOp<any>} ChildrenOpAny
*/
/**
* @typedef {AttrInsertOp<any>|AttrDeleteOp<any>|AttrModifyOp} AttrOpAny
*/
/**
* @typedef {ChildrenOpAny|AttrOpAny} _OpAny
*/
/**
* @type {s.Schema<DeltaAttrOpJSON>}
*/
export const $deltaMapChangeJson = s.$union(
s.$object({ type: s.$literal('insert'), value: s.$any, prevValue: s.$any.optional, attribution: $attribution.optional }),
s.$object({ type: s.$literal('modify'), value: s.$any }),
s.$object({ type: s.$literal('delete'), prevValue: s.$any.optional, attribution: $attribution.optional })
)
/**
* @template {{[key:string]: any} | null} Attrs
* @param {Attrs} attrs
* @return {Attrs}
*/
const _cloneAttrs = attrs => attrs == null ? attrs : { ...attrs }
/**
* @template {any} MaybeDelta
* @param {MaybeDelta} maybeDelta
* @return {MaybeDelta}
*/
const _markMaybeDeltaAsDone = maybeDelta => $deltaAny.check(maybeDelta) ? /** @type {MaybeDelta} */ (maybeDelta.done()) : maybeDelta
export class TextOp extends list.ListNode {
/**
* @param {string} insert
* @param {FormattingAttributes|null} format
* @param {Attribution?} attribution
*/
constructor (insert, format, attribution) {
super()
// Whenever this is modified, make sure to clear _fingerprint
/**
* @readonly
* @type {string}
*/
this.insert = insert
/**
* @readonly
* @type {FormattingAttributes|null}
*/
this.format = format
this.attribution = attribution
/**
* @type {string?}
*/
this._fingerprint = null
}
/**
* @param {string} newVal
*/
_updateInsert (newVal) {
// @ts-ignore
this.insert = newVal
this._fingerprint = null
}
/**
* @return {'insert'}
*/
get type () {
return 'insert'
}
get length () {
return this.insert.length
}
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 0) // textOp type: 0
encoding.writeVarString(encoder, this.insert)
encoding.writeAny(encoder, this.format)
})))
}
/**
* Remove a part of the operation (similar to Array.splice)
*
* @param {number} offset
* @param {number} len
*/
_splice (offset, len) {
this._fingerprint = null
// @ts-ignore
this.insert = this.insert.slice(0, offset) + this.insert.slice(offset + len)
return this
}
/**
* @return {DeltaListOpJSON}
*/
toJSON () {
const { insert, format, attribution } = this
return object.assign(/** @type {{type: 'insert', insert: string}} */ ({ type: 'insert', insert }), format != null ? { format } : ({}), attribution != null ? { attribution } : ({}))
}
/**
* @param {TextOp} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return fun.equalityDeep(this.insert, other.insert) && fun.equalityDeep(this.format, other.format) && fun.equalityDeep(this.attribution, other.attribution)
}
/**
* @return {TextOp}
*/
clone (start = 0, end = this.length) {
return new TextOp(this.insert.slice(start, end), _cloneAttrs(this.format), _cloneAttrs(this.attribution))
}
}
/**
* @template {fingerprintTrait.Fingerprintable} ArrayContent
*/
export class InsertOp extends list.ListNode {
/**
* @param {Array<ArrayContent>} insert
* @param {FormattingAttributes|null} format
* @param {Attribution?} attribution
*/
constructor (insert, format, attribution) {
super()
/**
* @readonly
* @type {Array<ArrayContent>}
*/
this.insert = insert
/**
* @readonly
* @type {FormattingAttributes?}
*/
this.format = format
/**
* @readonly
* @type {Attribution?}
*/
this.attribution = attribution
/**
* @type {string?}
*/
this._fingerprint = null
}
/**
* @param {ArrayContent} newVal
*/
_updateInsert (newVal) {
// @ts-ignore
this.insert = newVal
this._fingerprint = null
}
/**
* @return {'insert'}
*/
get type () {
return 'insert'
}
get length () {
return this.insert.length
}
/**
* @param {number} i
* @return {Extract<ArrayContent,DeltaAny>}
*/
_modValue (i) {
/**
* @type {any}
*/
let d = this.insert[i]
this._fingerprint = null
$deltaAny.expect(d)
if (d.isDone) {
// @ts-ignore
this.insert[i] = (d = clone(d))
return d
}
return d
}
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 1) // insertOp type: 1
encoding.writeVarUint(encoder, this.insert.length)
this.insert.forEach(ins => {
encoding.writeVarString(encoder, fingerprintTrait.fingerprint(ins))
})
encoding.writeAny(encoder, this.format)
})))
}
/**
* Remove a part of the operation (similar to Array.splice)
*
* @param {number} offset
* @param {number} len
*/
_splice (offset, len) {
this._fingerprint = null
this.insert.splice(offset, len)
return this
}
/**
* @return {DeltaListOpJSON}
*/
toJSON () {
const { insert, format, attribution } = this
return object.assign({ type: /** @type {'insert'} */ ('insert'), insert: insert.map(ins => $deltaAny.check(ins) ? ins.toJSON() : ins) }, format ? { format } : ({}), attribution != null ? { attribution } : ({}))
}
/**
* @param {InsertOp<ArrayContent>} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return fun.equalityDeep(this.insert, other.insert) && fun.equalityDeep(this.format, other.format) && fun.equalityDeep(this.attribution, other.attribution)
}
/**
* @return {InsertOp<ArrayContent>}
*/
clone (start = 0, end = this.length) {
return new InsertOp(this.insert.slice(start, end).map(_markMaybeDeltaAsDone), _cloneAttrs(this.format), _cloneAttrs(this.attribution))
}
}
/**
* @template {fingerprintTrait.Fingerprintable} [Children=never]
* @template {string} [Text=never]
*/
export class DeleteOp extends list.ListNode {
/**
* @param {number} len
*/
constructor (len) {
super()
this.delete = len
/**
* @type {(Children|Text) extends never ? null : (Delta<any,{},Children,Text>?)}
*/
this.prevValue = null
/**
* @type {string|null}
*/
this._fingerprint = null
}
/**
* @return {'delete'}
*/
get type () {
return 'delete'
}
get length () {
return 0
}
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 2) // deleteOp type: 2
encoding.writeVarUint(encoder, this.delete)
})))
}
/**
* Remove a part of the operation (similar to Array.splice)
*
* @param {number} _offset
* @param {number} len
*/
_splice (_offset, len) {
this.prevValue = /** @type {any} */ (this.prevValue?.slice(_offset, len) || null)
this._fingerprint = null
this.delete -= len
return this
}
/**
* @return {DeltaListOpJSON}
*/
toJSON () {
return { delete: this.delete }
}
/**
* @param {DeleteOp} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return this.delete === other.delete
}
clone (start = 0, end = this.delete) {
return new DeleteOp(end - start)
}
}
export class RetainOp extends list.ListNode {
/**
* @param {number} retain
* @param {FormattingAttributes|null} format
* @param {Attribution?} attribution
*/
constructor (retain, format, attribution) {
super()
/**
* @readonly
* @type {number}
*/
this.retain = retain
/**
* @readonly
* @type {FormattingAttributes?}
*/
this.format = format
/**
* @readonly
* @type {Attribution?}
*/
this.attribution = attribution
/**
* @type {string|null}
*/
this._fingerprint = null
}
/**
* @return {'retain'}
*/
get type () {
return 'retain'
}
get length () {
return this.retain
}
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 3) // retainOp type: 3
encoding.writeVarUint(encoder, this.retain)
encoding.writeAny(encoder, this.format)
})))
}
/**
* Remove a part of the operation (similar to Array.splice)
*
* @param {number} _offset
* @param {number} len
*/
_splice (_offset, len) {
// @ts-ignore
this.retain -= len
this._fingerprint = null
return this
}
/**
* @return {DeltaListOpJSON}
*/
toJSON () {
const { retain, format, attribution } = this
return object.assign({ type: /** @type {'retain'} */ ('retain'), retain }, format ? { format } : {}, attribution != null ? { attribution } : {})
}
/**
* @param {RetainOp} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return this.retain === other.retain && fun.equalityDeep(this.format, other.format) && fun.equalityDeep(this.attribution, other.attribution)
}
clone (start = 0, end = this.retain) {
return new RetainOp(end - start, _cloneAttrs(this.format), _cloneAttrs(this.attribution))
}
}
/**
* Delta that can be applied on a YType Embed
*
* @template {DeltaAny} [DTypes=DeltaAny]
*/
export class ModifyOp extends list.ListNode {
/**
* @param {DTypes} delta
* @param {FormattingAttributes|null} format
* @param {Attribution?} attribution
*/
constructor (delta, format, attribution) {
super()
/**
* @readonly
* @type {DTypes}
*/
this.value = delta
/**
* @readonly
* @type {FormattingAttributes?}
*/
this.format = format
/**
* @readonly
* @type {Attribution?}
*/
this.attribution = attribution
/**
* @type {string|null}
*/
this._fingerprint = null
}
/**
* @return {'modify'}
*/
get type () {
return 'modify'
}
get length () {
return 1
}
/**
* @type {DeltaBuilderAny}
*/
get _modValue () {
/**
* @type {any}
*/
const d = this.value
this._fingerprint = null
if (d.isDone) {
// @ts-ignore
return (this.value = clone(d))
}
return d
}
get fingerprint () {
// don't cache fingerprint because we don't know when delta changes
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 4) // modifyOp type: 4
encoding.writeVarString(encoder, this.value.fingerprint)
encoding.writeAny(encoder, this.format)
})))
}
/**
* Remove a part of the operation (similar to Array.splice)
*
* @param {number} _offset
* @param {number} _len
*/
_splice (_offset, _len) {
return this
}
/**
* @return {DeltaListOpJSON}
*/
toJSON () {
const { value, attribution, format } = this
return object.assign({ type: /** @type {'modify'} */ ('modify'), value: value.toJSON() }, format ? { format } : {}, attribution != null ? { attribution } : {})
}
/**
* @param {ModifyOp<any>} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return this.value[equalityTrait.EqualityTraitSymbol](other.value) && fun.equalityDeep(this.format, other.format) && fun.equalityDeep(this.attribution, other.attribution)
}
/**
* @return {ModifyOp<DTypes>}
*/
clone () {
return new ModifyOp(/** @type {DTypes} */ (this.value.done()), _cloneAttrs(this.format), _cloneAttrs(this.attribution))
}
}
/**
* @template {fingerprintTrait.Fingerprintable} V
* @template {string|number} [K=any]
*/
export class AttrInsertOp {
/**
* @param {K} key
* @param {V} value
* @param {V|undefined} prevValue
* @param {Attribution?} attribution
*/
constructor (key, value, prevValue, attribution) {
/**
* @readonly
* @type {K}
*/
this.key = key
/**
* @readonly
* @type {V}
*/
this.value = value
/**
* @readonly
* @type {V|undefined}
*/
this.prevValue = prevValue
/**
* @readonly
* @type {Attribution?}
*/
this.attribution = attribution
/**
* @type {string|null}
*/
this._fingerprint = null
}
/**
* @return {'insert'}
*/
get type () { return 'insert' }
/**
* @type {DeltaBuilderAny}
*/
get _modValue () {
/**
* @type {any}
*/
const v = this.value
this._fingerprint = null
if ($deltaAny.check(v) && v.isDone) {
// @ts-ignore
return (this.value = clone(v))
}
return v
}
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 5) // map insert type: 5
encoding.writeAny(encoder, this.key)
if ($deltaAny.check(this.value)) {
encoding.writeUint8(encoder, 0)
encoding.writeVarString(encoder, this.value.fingerprint)
} else {
encoding.writeUint8(encoder, 1)
encoding.writeAny(encoder, this.value)
}
})))
}
toJSON () {
const v = this.value
const prevValue = this.prevValue
const attribution = this.attribution
return object.assign({
type: this.type,
value: $deltaAny.check(v) ? v.toJSON() : v
}, attribution != null ? { attribution } : {}, prevValue !== undefined ? { prevValue } : {})
}
/**
* @param {AttrInsertOp<V>} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return this.key === other.key && fun.equalityDeep(this.value, other.value) && fun.equalityDeep(this.attribution, other.attribution)
}
/**
* @return {AttrInsertOp<V,K>}
*/
clone () {
return new AttrInsertOp(this.key, _markMaybeDeltaAsDone(this.value), _markMaybeDeltaAsDone(this.prevValue), _cloneAttrs(this.attribution))
}
}
/**
* @template V
* @template {string|number} [K=string]
*/
export class AttrDeleteOp {
/**
* @param {K} key
* @param {V|undefined} prevValue
* @param {Attribution?} attribution
*/
constructor (key, prevValue, attribution) {
/**
* @type {K}
*/
this.key = key
/**
* @type {V|undefined}
*/
this.prevValue = prevValue
this.attribution = attribution
/**
* @type {string|null}
*/
this._fingerprint = null
}
get value () { return undefined }
/**
* @type {'delete'}
*/
get type () { return 'delete' }
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 6) // map delete type: 6
encoding.writeAny(encoder, this.key)
})))
}
/**
* @return {DeltaAttrOpJSON}
*/
toJSON () {
const {
type, attribution, prevValue
} = this
return object.assign({ type }, attribution != null ? { attribution } : {}, prevValue !== undefined ? { prevValue } : {})
}
/**
* @param {AttrDeleteOp<V>} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return this.key === other.key && fun.equalityDeep(this.attribution, other.attribution)
}
clone () {
return new AttrDeleteOp(this.key, _markMaybeDeltaAsDone(this.prevValue), _cloneAttrs(this.attribution))
}
}
/**
* @template {DeltaAny} [Modifier=DeltaAny]
* @template {string|number} [K=string]
*/
export class AttrModifyOp {
/**
* @param {K} key
* @param {Modifier} delta
*/
constructor (key, delta) {
/**
* @readonly
* @type {K}
*/
this.key = key
/**
* @readonly
* @type {Modifier}
*/
this.value = delta
/**
* @type {string|null}
*/
this._fingerprint = null
}
/**
* @type {'modify'}
*/
get type () { return 'modify' }
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeVarUint(encoder, 7) // map modify type: 7
encoding.writeAny(encoder, this.key)
encoding.writeVarString(encoder, this.value.fingerprint)
})))
}
/**
* @return {DeltaBuilder}
*/
get _modValue () {
this._fingerprint = null
if (this.value.isDone) {
// @ts-ignore
this.value = /** @type {any} */ (clone(this.value))
}
// @ts-ignore
return this.value
}
/**
* @return {DeltaAttrOpJSON}
*/
toJSON () {
return {
type: this.type,
value: this.value.toJSON()
}
}
/**
* @param {AttrModifyOp<Modifier>} other
*/
[equalityTrait.EqualityTraitSymbol] (other) {
return this.key === other.key && this.value[equalityTrait.EqualityTraitSymbol](other.value)
}
/**
* @return {AttrModifyOp<Modifier,K>}
*/
clone () {
return new AttrModifyOp(this.key, /** @type {Modifier} */ (this.value.done()))
}
}
/**
* @type {s.Schema<AttrDeleteOp<any> | DeleteOp>}
*/
export const $deleteOp = s.$custom(o => o != null && (o.constructor === DeleteOp || o.constructor === AttrDeleteOp))
/**
* @type {s.Schema<AttrInsertOp<any> | InsertOp<any>>}
*/
export const $insertOp = s.$custom(o => o != null && (o.constructor === AttrInsertOp || o.constructor === InsertOp))
/**
* @template {fingerprintTrait.Fingerprintable} Content
* @param {s.Schema<Content>} $content
* @return {s.Schema<AttrInsertOp<Content> | InsertOp<Content>>}
*/
export const $insertOpWith = $content => s.$custom(o =>
o != null && (
(o.constructor === AttrInsertOp && $content.check(/** @type {AttrInsertOp<Content>} */ (o).value)) ||
(o.constructor === InsertOp && /** @type {InsertOp<Content>} */ (o).insert.every(ins => $content.check(ins)))
)
)
/**
* @type {s.Schema<TextOp>}
*/
export const $textOp = s.$constructedBy(TextOp)
/**
* @type {s.Schema<RetainOp>}
*/
export const $retainOp = s.$constructedBy(RetainOp)
/**
* @type {s.Schema<AttrModifyOp | ModifyOp>}
*/
export const $modifyOp = s.$custom(o => o != null && (o.constructor === AttrModifyOp || o.constructor === ModifyOp))
/**
* @template {DeltaAny} Modify
* @param {s.Schema<Modify>} $content
* @return {s.Schema<AttrModifyOp<Modify> | ModifyOp<Modify>>}
*/
export const $modifyOpWith = $content => s.$custom(o =>
o != null && (
(o.constructor === AttrModifyOp && $content.check(/** @type {AttrModifyOp<Modify>} */ (o).value)) ||
(o.constructor === ModifyOp && $content.check(/** @type {ModifyOp<Modify>} */ (o).value))
)
)
export const $anyOp = s.$union($insertOp, $deleteOp, $textOp, $modifyOp)
/**
* @template {Array<any>|string} C1
* @template {Array<any>|string} C2
* @typedef {Extract<C1 | C2, Array<any>> extends never
* ? never
* : (Array<(Extract<C1 | C2,Array<any>> extends Array<infer AC1> ? (unknown extends AC1 ? never : AC1) : never)>)} MergeListArrays
*/
/**
* @template {{[Key in string|number]: any}} Attrs
* @template {string|number} Key
* @template {any} Val
* @typedef {{ [K in (Key | keyof Attrs)]: (unknown extends Attrs[K] ? never : Attrs[K]) | (Key extends K ? Val : never) }} AddToAttrs
*/
/**
* @template {{[Key in string|number|symbol]: any}} Attrs
* @template {{[Key in string|number|symbol]: any}} NewAttrs
* @typedef {{ [K in (keyof NewAttrs | keyof Attrs)]: (unknown extends Attrs[K] ? never : Attrs[K]) | (unknown extends NewAttrs[K] ? never : NewAttrs[K]) }} MergeAttrs
*/
/**
* @template X
* @typedef {0 extends (1 & X) ? null : X} _AnyToNull
*/
/**
* @template {s.Schema<Delta<any,any,any,any,any>>|null} Schema
* @typedef {_AnyToNull<Schema> extends null ? Delta<any,{[key:string|number]:any},any,string> : (Schema extends s.Schema<infer D> ? D : never)} AllowedDeltaFromSchema
*/
/**
* @typedef {Delta<any,{ [k:string|number]: any },any,any,any>} DeltaAny
*/
/**
* @typedef {DeltaBuilder<any,{ [k:string|number]: any },any,any,any>} DeltaBuilderAny
*/
/**
* @template {string} [NodeName=any]
* @template {{[k:string|number]:any}} [Attrs={}]
* @template {fingerprintTrait.Fingerprintable} [Children=never]
* @template {string} [Text=never]
* @template {s.Schema<Delta<any,any,any,any,any>>|null} [Schema=any]
*/
export class Delta {
/**
* @param {NodeName} [name]
* @param {Schema} [$schema]
*/
constructor (name, $schema) {
this.name = name || null
this.$schema = $schema || null
/**
* @type {{ [K in keyof Attrs]?: K extends string|number ? (AttrInsertOp<Attrs[K],K>|AttrDeleteOp<Attrs[K],K>|(Delta extends Attrs[K] ? AttrModifyOp<Extract<Attrs[K],DeltaAny>,K> : never)) : never }
* & { [Symbol.iterator]: () => Iterator<{ [K in keyof Attrs]: K extends string|number ? (AttrInsertOp<Attrs[K],K>|AttrDeleteOp<Attrs[K],K>|(Delta extends Attrs[K] ? AttrModifyOp<Extract<Attrs[K],DeltaAny>,K> : never)) : never }[keyof Attrs]> }
* }
*/
this.attrs = /** @type {any} */ ({
* [Symbol.iterator] () {
for (const k in this) {
yield this[k]
}
}
})
/**
* @type {list.List<
* RetainOp
* | DeleteOp
* | (Text extends never ? never : TextOp)
* | (Children extends never ? never : InsertOp<Children>)
* | (Delta extends Children ? ModifyOp<Extract<Children,Delta<any,any,any,any,any>>> : never)
* >}
*/
this.children = /** @type {any} */ (list.create())
this.childCnt = 0
/**
* @type {any}
*/
this.origin = null
/**
* @type {string|null}
*/
this._fingerprint = null
this.isDone = false
}
/**
* @type {string}
*/
get fingerprint () {
return this._fingerprint || (this._fingerprint = buffer.toBase64(encoding.encode(encoder => {
encoding.writeUint32(encoder, 0xf2ae5680) // "magic number" that ensures that different types of content don't yield the same fingerprint
encoding.writeAny(encoder, this.name)
/**
* @type {Array<number|string>}
*/
const keys = []
for (const attr of this.attrs) {
keys.push(attr.key)
}
keys.sort((a, b) => {
const aIsString = s.$string.check(a)
const bIsString = s.$string.check(b)
// numbers first
// in ascending order
return (aIsString && bIsString)
? a.localeCompare(b)
: (aIsString ? 1 : (bIsString ? -1 : (a - b)))
})
encoding.writeVarUint(encoder, keys.length)
for (const key of keys) {
encoding.writeVarString(encoder, /** @type {any} */ (this.attrs[/** @type {keyof Attrs} */ (key)]).fingerprint)
}
encoding.writeVarUint(encoder, this.children.len)
for (const child of this.children) {
encoding.writeVarString(encoder, child.fingerprint)
}
return buffer.toBase64(rabin.fingerprint(rabin.StandardIrreducible128, encoding.toUint8Array(encoder)))
})))
}
[fingerprintTrait.FingerprintTraitSymbol] () {
return this.fingerprint
}
isEmpty () {
return object.isEmpty(this.attrs) && list.isEmpty(this.children)
}
/**
* @return {DeltaJSON}
*/
toJSON () {
const name = this.name
/**
* @type {any}
*/
const attrs = {}
/**
* @type {any}
*/
const children = []
for (const attr of this.attrs) {
attrs[attr.key] = attr.toJSON()
}
this.children.forEach(val => {
children.push(val.toJSON())
})
return object.assign(
{ type: /** @type {'delta'} */ ('delta') },
(name != null ? { name } : {}),
(object.isEmpty(attrs) ? {} : { attrs }),
(children.length > 0 ? { children } : {})
)
}
/**
* @param {Delta<any,any,any,any,any>} other
* @return {boolean}
*/
equals (other) {
return this[equalityTrait.EqualityTraitSymbol](other)
}
/**
* @param {any} other
* @return {boolean}
*/
[equalityTrait.EqualityTraitSymbol] (other) {
// @todo it is only necessary to compare finrerprints OR do a deep equality check (remove
// childCnt as well)
return this.name === other.name && fun.equalityDeep(this.attrs, other.attrs) && fun.equalityDeep(this.children, other.children) && this.childCnt === other.childCnt
}
/**
* @return {DeltaBuilder<NodeName,Attrs,Children,Text,Schema>}
*/
clone () {
return this.slice(0, this.childCnt)
}
/**
* @param {number} start
* @param {number} end
* @return {DeltaBuilder<NodeName,Attrs,Children,Text,Schema>}
*/
slice (start = 0, end = this.childCnt) {
const cpy = /** @type {DeltaAny} */ (new DeltaBuilder(/** @type {any} */ (this.name), this.$schema))
cpy.origin = this.origin
// copy attrs
for (const op of this.attrs) {
cpy.attrs[op.key] = /** @type {any} */ (op.clone())
}
// copy children
const slicedLen = end - start
let remainingLen = slicedLen
/**
* @type {ChildrenOpAny?}
*/
let currNode = this.children.start
let currNodeOffset = 0
while (start > 0 && currNode != null) {
if (currNode.length <= start) {
start -= currNode.length
currNode = currNode.next
} else {
currNodeOffset = start
start = 0
}
}
if (currNodeOffset > 0 && currNode) {
const ncpy = currNode.clone(currNodeOffset, currNodeOffset + math.min(remainingLen, currNode.length - currNodeOffset))
list.pushEnd(cpy.children, ncpy)
remainingLen -= ncpy.length
currNode = currNode.next
}
while (currNode != null && currNode.length <= remainingLen) {
list.pushEnd(cpy.children, currNode.clone())
remainingLen -= currNode.length
currNode = currNode.next
}
if (currNode != null && remainingLen > 0) {
list.pushEnd(cpy.children, currNode.clone(0, remainingLen))
remainingLen -= math.min(currNode.length, remainingLen)
}
cpy.childCnt = slicedLen - remainingLen
// @ts-ignore
return cpy
}
/**
* Mark this delta as done and perform some cleanup (e.g. remove appended retains without
* formats&attributions). In the future, there might be additional merge operations that can be
* performed to result in smaller deltas. Set `markAsDone=false` to only perform the cleanup.
*
* @return {Delta<NodeName,Attrs,Children,Text,Schema>}
*/
done (markAsDone = true) {
if (!this.isDone) {
this.isDone = markAsDone
const cs = this.children
for (let end = cs.end; end !== null && $retainOp.check(end) && end.format == null && end.attribution == null; end = cs.end) {
this.childCnt -= end.length
list.popEnd(cs)
}
}
return this
}
}
/**
* @template {DeltaAny} D
* @param {D} d
* @return {D extends DeltaBuilder<infer NodeName,infer Attrs,infer Children,infer Text,infer Schema> ? DeltaBuilder<NodeName,Attrs,Children,Text,Schema> : never}
*/
export const clone = d => /** @type {any} */ (d.slice(0, d.childCnt))
/**
* Try merging this op with the previous op
* @param {list.List<any>} parent
* @param {InsertOp<any>|RetainOp|DeleteOp|TextOp|ModifyOp<any>} op
*/
const tryMergeWithPrev = (parent, op) => {
const prevOp = op.prev
if (
prevOp?.constructor !== op.constructor ||
(
(!$deleteOp.check(op) && !$modifyOp.check(op)) && (!fun.equalityDeep(op.format, /** @type {InsertOp<any>} */ (prevOp).format) || !fun.equalityDeep(op.attribution, /** @type {InsertOp<any>} */ (prevOp).attribution))
)
) {
// constructor mismatch or format/attribution mismatch
return
}
// can be merged
if ($insertOp.check(op)) {
/** @type {InsertOp<any>} */ (prevOp).insert.push(...op.insert)
} else if ($retainOp.check(op)) {
// @ts-ignore
/** @type {RetainOp} */ (prevOp).retain += op.retain
} else if ($deleteOp.check(op)) {
/** @type {DeleteOp} */ (prevOp).delete += op.delete
} else if ($textOp.check(op)) {
/** @type {TextOp} */ (prevOp)._updateInsert(/** @type {TextOp} */ (prevOp).insert + op.insert)
} else {
error.unexpectedCase()
}
list.remove(parent, op)
}
/**
* Ensures that the delta can be edited. clears _fingerprint cache.
*
* @param {any} d
*/
const modDeltaCheck = d => {
if (d.isDone) {
/**
* You tried to modify a delta after it has been marked as "done".
*/
throw error.create("Readonly Delta can't be modified")
}
d._fingerprint = null
}
/**
* @template {string} [NodeName=any]
* @template {{[key:string|number]:any}} [Attrs={}]
* @template {fingerprintTrait.Fingerprintable} [Children=never]
* @template {string} [Text=never]
* @template {s.Schema<Delta<any,any,any,any,any>>|null} [Schema=any]
* @extends {Delta<NodeName,Attrs,Children,Text,Schema>}
*/
export class DeltaBuilder extends Delta {
/**
* @param {NodeName} [name]
* @param {Schema} [$schema]
*/
constructor (name, $schema) {
super(name, $schema)
/**
* @type {FormattingAttributes?}
*/
this.usedAttributes = null
/**
* @type {Attribution?}
*/
this.usedAttribution = null
}
/**
* @param {Attribution?} attribution
*/
useAttribution (attribution) {
modDeltaCheck(this)
this.usedAttribution = attribution
return this
}
/**
* @param {FormattingAttributes?} attributes
* @return {this}
*/
useAttributes (attributes) {
modDeltaCheck(this)
this.usedAttributes = attributes
return this
}
/**
* @param {string} name
* @param {any} value
*/
updateUsedAttributes (name, value) {
modDeltaCheck(this)
if (value == null) {
this.usedAttributes = object.assign({}, this.usedAttributes)
delete this.usedAttributes?.[name]
if (object.isEmpty(this.usedAttributes)) {
this.usedAttributes = null
}
} else if (!fun.equalityDeep(this.usedAttributes?.[name], value)) {
this.usedAttributes = object.assign({}, this.usedAttributes)
this.usedAttributes[name] = value
}
return this
}
/**
* @template {keyof Attribution} NAME
* @param {NAME} name
* @param {Attribution[NAME]?} value
*/
updateUsedAttribution (name, value) {
modDeltaCheck(this)
if (value == null) {
this.usedAttribution = object.assign({}, this.usedAttribution)
delete this.usedAttribution?.[name]
if (object.isEmpty(this.usedAttribution)) {
this.usedAttribution = null
}
} else if (!fun.equalityDeep(this.usedAttribution?.[name], value)) {
this.usedAttribution = object.assign({}, this.usedAttribution)
this.usedAttribution[name] = value
}
return this
}
/**
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,any,infer Children,infer Text,infer Schema> ? ((Children extends never ? never : Array<Children>) | Text) : never} NewContent
* @param {NewContent} insert
* @param {FormattingAttributes?} [formatting]
* @param {Attribution?} [attribution]
* @return {DeltaBuilder<
* NodeName,
* Attrs,
* Exclude<NewContent,string>[number]|Children,
* (Extract<NewContent,string>|Text) extends never ? never : string,
* Schema
* >}
*/
insert (insert, formatting = null, attribution = null) {
modDeltaCheck(this)
const mergedAttributes = mergeAttrs(this.usedAttributes, formatting)
const mergedAttribution = mergeAttrs(this.usedAttribution, attribution)
/**
* @param {TextOp | InsertOp<any>} lastOp
*/
const checkMergedEquals = lastOp => (mergedAttributes === lastOp.format || fun.equalityDeep(mergedAttributes, lastOp.format)) && (mergedAttribution === lastOp.attribution || fun.equalityDeep(mergedAttribution, lastOp.attribution))
const end = this.children.end
if (s.$string.check(insert)) {
if ($textOp.check(end) && checkMergedEquals(end)) {
end._updateInsert(end.insert + insert)
} else if (insert.length > 0) {
list.pushEnd(this.children, new TextOp(insert, object.isEmpty(mergedAttributes) ? null : mergedAttributes, object.isEmpty(mergedAttribution) ? null : mergedAttribution))
}
this.childCnt += insert.length
} else if (arr.isArray(insert)) {
if ($insertOp.check(end) && checkMergedEquals(end)) {
// @ts-ignore
end.insert.push(...insert)
end._fingerprint = null
} else if (insert.length > 0) {
list.pushEnd(this.children, new InsertOp(insert, object.isEmpty(mergedAttributes) ? null : mergedAttributes, object.isEmpty(mergedAttribution) ? null : mergedAttribution))
}
this.childCnt += insert.length
}
return /** @type {any} */ (this)
}
/**
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,any,infer Children,any,any> ? Extract<Children,Delta<any,any,any,any,any>> : never} NewContent
* @param {NewContent} modify
* @param {FormattingAttributes?} formatting
* @param {Attribution?} attribution
* @return {DeltaBuilder<
* NodeName,
* Attrs,
* Exclude<NewContent,string>[number]|Children,
* (Extract<NewContent,string>|Text) extends string ? string : never,
* Schema
* >}
*/
modify (modify, formatting = null, attribution = null) {
modDeltaCheck(this)
const mergedAttributes = mergeAttrs(this.usedAttributes, formatting)
const mergedAttribution = mergeAttrs(this.usedAttribution, attribution)
list.pushEnd(this.children, new ModifyOp(modify, object.isEmpty(mergedAttributes) ? null : mergedAttributes, object.isEmpty(mergedAttribution) ? null : mergedAttribution))
this.childCnt += 1
return /** @type {any} */ (this)
}
/**
* @param {number} len
* @param {FormattingAttributes?} [format]
* @param {Attribution?} [attribution]
*/
retain (len, format = null, attribution = null) {
modDeltaCheck(this)
const mergedFormats = mergeAttrs(this.usedAttributes, format)
const mergedAttribution = mergeAttrs(this.usedAttribution, attribution)
const lastOp = /** @type {RetainOp|InsertOp<any>} */ (this.children.end)
if (lastOp instanceof RetainOp && fun.equalityDeep(mergedFormats, lastOp.format) && fun.equalityDeep(mergedAttribution, lastOp.attribution)) {
// @ts-ignore
lastOp.retain += len
} else if (len > 0) {
list.pushEnd(this.children, new RetainOp(len, mergedFormats, mergedAttribution))
}
this.childCnt += len
return this
}
/**
* @param {number} len
*/
delete (len) {
modDeltaCheck(this)
const lastOp = /** @type {DeleteOp|InsertOp<any>} */ (this.children.end)
if (lastOp instanceof DeleteOp) {
lastOp.delete += len
} else if (len > 0) {
list.pushEnd(this.children, new DeleteOp(len))
}
this.childCnt += len
return this
}
/**
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,infer Attrs,any,any,any> ? (keyof Attrs) : never} Key
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,infer Attrs,any,any,any> ? (Attrs[Key]) : never} Val
* @param {Key} key
* @param {Val} val
* @param {Attribution?} attribution
* @param {Val|undefined} [prevValue]
* @return {DeltaBuilder<
* NodeName,
* { [K in keyof AddToAttrs<Attrs,Key,Val>]: AddToAttrs<Attrs,Key,Val>[K] },
* Children,
* Text,
* Schema
* >}
*/
set (key, val, attribution = null, prevValue) {
modDeltaCheck(this)
this.attrs[key] = /** @type {any} */ (new AttrInsertOp(key, val, prevValue, mergeAttrs(this.usedAttribution, attribution)))
return /** @type {any} */ (this)
}
/**
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,infer Attrs,any,any,any> ? Attrs : never} NewAttrs
* @param {NewAttrs} attrs
* @param {Attribution?} attribution
* @return {DeltaBuilder<
* NodeName,
* { [K in keyof MergeAttrs<Attrs,NewAttrs>]: MergeAttrs<Attrs,NewAttrs>[K] },
* Children,
* Text,
* Schema
* >}
*/
setMany (attrs, attribution = null) {
modDeltaCheck(this)
for (const k in attrs) {
this.set(/** @type {any} */ (k), attrs[k], attribution)
}
return /** @type {any} */ (this)
}
/**
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,infer As,any,any,any> ? keyof As : never} Key
* @param {Key} key
* @param {Attribution?} attribution
* @param {any} [prevValue]
* @return {DeltaBuilder<
* NodeName,
* { [K in keyof AddToAttrs<Attrs,Key,never>]: AddToAttrs<Attrs,Key,never>[K] },
* Children,
* Text,
* Schema
* >}
*/
unset (key, attribution = null, prevValue) {
modDeltaCheck(this)
this.attrs[key] = /** @type {any} */ (new AttrDeleteOp(key, prevValue, mergeAttrs(this.usedAttribution, attribution)))
return /** @type {any} */ (this)
}
/**
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,infer As,any,any,any> ? { [K in keyof As]: Extract<As[K],Delta<any,any,any,any,any>> extends never ? never : K }[keyof As] : never} Key
* @template {AllowedDeltaFromSchema<Schema> extends Delta<any,infer As,any,any,any> ? Extract<As[Key],Delta<any,any,any,any,any>> : never} D
* @param {Key} key
* @param {D} modify
* @return {DeltaBuilder<
* NodeName,
* { [K in keyof AddToAttrs<Attrs,Key,D>]: AddToAttrs<Attrs,Key,D>[K] },
* Children,
* Text,
* Schema
* >}
*/
update (key, modify) {
modDeltaCheck(this)
this.attrs[key] = /** @type {any} */ (new AttrModifyOp(key, modify))
return /** @type {any} */ (this)
}
/**
* @param {Delta<NodeName,Attrs,Children,Text,any>} other
*/
apply (other) {
modDeltaCheck(this)
this.$schema?.expect(other)
// apply attrs
for (const op of other.attrs) {
const c = /** @type {AttrInsertOp<any,any>|AttrDeleteOp<any>|AttrModifyOp<any,any>} */ (this.attrs[op.key])
if ($modifyOp.check(op)) {
if ($deltaAny.check(c?.value)) {
c._modValue.apply(op.value)
} else {
// then this is a simple modify
// @ts-ignore
this.attrs[op.key] = op.clone()
}
} else if ($insertOp.check(op)) {
// @ts-ignore
op.prevValue = c?.value
// @ts-ignore
this.attrs[op.key] = op.clone()
} else if ($deleteOp.check(op)) {
op.prevValue = c?.value
delete this.attrs[op.key]
}
}
// apply children
/**
* @type {ChildrenOpAny?}
*/
let opsI = this.children.start
let offset = 0
/**
* At the end, we will try to merge this op, and op.next op with their respective previous op.
*
* Hence, anytime an op is cloned, deleted, or inserted (anytime list.* api is used) we must add
* an op to maybeMergeable.
*
* @type {Array<InsertOp<any>|RetainOp|DeleteOp|TextOp|ModifyOp<any>>}
*/
const maybeMergeable = []
/**
* @template {InsertOp<any>|RetainOp|DeleteOp|TextOp|ModifyOp<any>|null} OP
* @param {OP} op
* @return {OP}
*/
const scheduleForMerge = op => {
op && maybeMergeable.push(op)
return op
}
other.children.forEach(op => {
if ($textOp.check(op) || $insertOp.check(op)) {
if (offset === 0) {
list.insertBetween(this.children, opsI == null ? this.children.end : opsI.prev, opsI, scheduleForMerge(op.clone()))
} else {
// @todo inmplement "splitHelper" and "insertHelper" - I'm splitting all the time and
// forget to update opsI
if (opsI == null) error.unexpectedCase()
const cpy = scheduleForMerge(opsI.clone(offset))
opsI._splice(offset, opsI.length - offset)
list.insertBetween(this.children, opsI, opsI.next || null, cpy)
list.insertBetween(this.children, opsI, cpy || null, scheduleForMerge(op.clone()))
opsI = cpy
offset = 0
}
this.childCnt += op.insert.length
} else if ($retainOp.check(op)) {
let retainLen = op.length
if (offset > 0 && opsI != null && op.format != null && !$deleteOp.check(opsI) && !object.every(op.format, (v, k) => fun.equalityDeep(v, /** @type {InsertOp<any>|RetainOp|ModifyOp} */ (opsI).format?.[k] || null))) {
// need to split current op
const cpy = scheduleForMerge(opsI.clone(offset))
opsI._splice(offset, opsI.length - offset)
list.insertBetween(this.children, opsI, opsI.next || null, cpy)
opsI = cpy
offset = 0
}
while (opsI != null && opsI.length - offset <= retainLen) {
op.format != null && updateOpFormat(opsI, op.format)
retainLen -= opsI.length - offset
opsI = opsI?.next || null
offset = 0
}
if (opsI != null) {
if (op.format != null && retainLen > 0) {
// split current op and apply format
const cpy = scheduleForMerge(opsI.clone(retainLen))
opsI._splice(retainLen, opsI.length - retainLen)
list.insertBetween(this.children, opsI, opsI.next || null, cpy)
updateOpFormat(opsI, op.format)
opsI = cpy
} else {
offset += retainLen
}
} else if (retainLen > 0) {
list.pushEnd(this.children, scheduleForMerge(new RetainOp(retainLen, op.format, op.attribution)))
this.childCnt += retainLen
}
} else if ($deleteOp.check(op)) {
let remainingLen = op.delete
while (remainingLen > 0) {
if (opsI == null) {
list.pushEnd(this.children, scheduleForMerge(new DeleteOp(remainingLen)))
this.childCnt += remainingLen
break
} else if (opsI instanceof DeleteOp) {
const delLen = opsI.length - offset
// the same content can't be deleted twice, remove duplicated deletes
if (delLen >= remainingLen) {
offset = 0
opsI = opsI.next
} else {
offset += remainingLen
}
remainingLen -= delLen
} else { // insert / embed / retain / modify ⇒ replace
// case1: delete o fully
// case2: delete some part of beginning
// case3: delete some part of end
// case4: delete some part of center
const delLen = math.min(opsI.length - offset, remainingLen)
this.childCnt -= delLen
if (opsI.length === delLen) {
// case 1
offset = 0
scheduleForMerge(opsI.next)
list.remove(this.children, opsI)
opsI = opsI.next
} else if (offset === 0) {
// case 2
offset = 0
opsI._splice(0, delLen)
} else if (offset + delLen === opsI.length) {
// case 3
opsI._splice(offset, delLen)
offset = 0
opsI = opsI.next
} else {
// case 4
opsI._splice(offset, delLen)
}
remainingLen -= delLen
}
}
} else if ($modifyOp.check(op)) {
if (opsI == null) {
list.pushEnd(this.children, op.clone())
this.childCnt += 1
return
}
if ($modifyOp.check(opsI)) {
opsI._modValue.apply(op.value)
} else if ($insertOp.check(opsI)) {
opsI._modValue(offset).apply(op.value)
} else if ($retainOp.check(opsI)) {
if (offset > 0) {
const cpy = scheduleForMerge(opsI.clone(0, offset)) // skipped len
opsI._splice(0, offset) // new remainder
list.insertBetween(this.children, opsI.prev, opsI, cpy) // insert skipped len
offset = 0
}
list.insertBetween(this.children, opsI.prev, opsI, scheduleForMerge(op.clone())) // insert skipped len
if (opsI.length === 1) {
list.remove(this.children, opsI)
} else {
opsI._splice(0, 1)
scheduleForMerge(opsI)
}
} else if ($deleteOp.check(opsI)) {
// nop
} else {
error.unexpectedCase()
}
} else {
error.unexpectedCase()
}
})
maybeMergeable.forEach(op => {
// check if this is still integrated
if (op.prev?.next === op) {
tryMergeWithPrev(this.children, op)
op.next && tryMergeWithPrev(this.children, op.next)
}
})
return this
}
/**
* @param {DeltaAny} other
* @param {boolean} priority
*/
rebase (other, priority) {
modDeltaCheck(this)
/**
* Rebase attributes
*
* - insert vs delete ⇒ insert takes precedence
* - insert vs modify ⇒ insert takes precedence
* - insert vs insert ⇒ priority decides
* - delete vs modify ⇒ delete takes precedence
* - delete vs delete ⇒ current delete op is removed because item has already been deleted
* - modify vs modify ⇒ rebase using priority
*/
for (const op of this.attrs) {
if ($insertOp.check(op)) {
if ($insertOp.check(other.attrs[op.key]) && !priority) {
delete this.attrs[op.key]
}
} else if ($deleteOp.check(op)) {
const otherOp = other.attrs[/** @type {any} */ (op.key)]
if ($insertOp.check(otherOp)) {
delete this.attrs[otherOp.key]
}
} else if ($modifyOp.check(op)) {
const otherOp = other.attrs[/** @type {any} */ (op.key)]
if (otherOp == null) {
// nop
} else if ($modifyOp.check(otherOp)) {
op._modValue.rebase(otherOp.value, priority)
} else {
delete this.attrs[otherOp.key]
}
}
}
/**
* Rebase children.
*
* Precedence: insert with higher priority comes first. Op with less priority is transformed to
* be inserted later.
*
* @todo always check if inser OR text
*/
/**
* @type {ChildrenOpAny?}
*/
let currChild = this.children.start
let currOffset = 0
/**
* @type {ChildrenOpAny?}
*/
let otherChild = other.children.start
let otherOffset = 0
while (currChild != null && otherChild != null) {
if ($insertOp.check(currChild) || $textOp.check(currChild)) {
/**
* Transforming *insert*. If other is..
* - insert: transform based on priority
* - retain/delete/modify: transform next op against other
*/
if ($insertOp.check(otherChild) || $modifyOp.check(otherChild) || $textOp.check(otherChild)) {
if (!priority) {
list.insertBetween(this.children, currChild.prev, currChild, new RetainOp(otherChild.length, null, null))
this.childCnt += otherChild.length
// curr is transformed against other, transform curr against next
otherOffset = otherChild.length
} else {
// curr stays as is, transform next op
currOffset = currChild.length
}
} else { // otherChild = delete | retain | modify - curr stays as is, transform next op
currOffset = currChild.length
}
} else if ($modifyOp.check(currChild)) {
/**
* Transforming *modify*. If other is..
* - insert: adjust position
* - modify: rebase curr modify on other modify
* - delete: remove modify
* - retain: adjust offset
*/
if ($insertOp.check(otherChild) || $textOp.check(otherChild)) {
// @todo: with all list changes (retain insertions, removal), try to merge the surrounding
// ops later
list.insertBetween(this.children, currChild.prev, currChild, new RetainOp(otherChild.length, null, null))
this.childCnt += otherChild.length
// curr is transformed against other, transform curr against next
otherOffset = otherChild.length
} else {
if ($modifyOp.check(otherChild)) {
/** @type {any} */ (currChild.value).rebase(otherChild, priority)
} else if ($deleteOp.check(otherChild)) {
list.remove(this.children, currChild)
this.childCnt -= 1
}
currOffset += 1
otherOffset += 1
}
} else { // DeleteOp | RetainOp
const maxCommonLen = math.min(currChild.length - currOffset, otherChild.length - otherOffset)
/**
* Transforming *retain* OR *delete*. If other is..
* - retain / modify: adjust offsets
* - delete: shorten curr op
* - insert: split curr op and insert retain
*/
if ($retainOp.check(otherChild) || $modifyOp.check(otherChild)) {
currOffset += maxCommonLen
otherOffset += maxCommonLen
} else if ($deleteOp.check(otherChild)) {
if ($retainOp.check(currChild)) {
// @ts-ignore
currChild.retain -= maxCommonLen
} else if ($deleteOp.check(currChild)) {
currChild.delete -= maxCommonLen
}
this.childCnt -= maxCommonLen
} else { // insert/text.check(currOp)
if (currOffset > 0) {
const leftPart = currChild.clone(currOffset)
list.insertBetween(this.children, currChild.prev, currChild, leftPart)
currChild._splice(currOffset, currChild.length - currOffset)
currOffset = 0
}
list.insertBetween(this.children, currChild.prev, currChild, new RetainOp(otherChild.length, null, null))
this.childCnt += otherChild.length
otherOffset = otherChild.length
}
}
if (currOffset >= currChild.length) {
currChild = currChild.next
currOffset = 0
}
if (otherOffset >= otherChild.length) {
otherChild = otherChild.next
otherOffset = 0
}
}
return this
}
/**
* Same as doing `delta.rebase(other.inverse())`, without creating a temporary delta.
*
* @param {DeltaAny} other
* @param {boolean} priority
*/
rebaseOnInverse (other, priority) {
modDeltaCheck(this)
// @todo
console.info('method rebaseOnInverse unimplemented')
return this
}
/**
* Append child ops from one op to the other.
*
* delta.create().insert('a').append(delta.create().insert('b')) // => insert "ab"
*
* @template {DeltaAny} OtherDelta
* @param {OtherDelta} other
* @return {CastToDelta<OtherDelta> extends Delta<any,any,infer OtherChildren,infer OtherText,any> ? DeltaBuilder<NodeName,Attrs,Children|OtherChildren,Text|OtherText,Schema> : never}
*/
append (other) {
const children = this.children
const prevLast = children.end
// @todo Investigate. Above is a typescript issue. It is necessary to cast OtherDelta to a Delta first before
// inferring type, otherwise Children will contain Text.
for (const child of other.children) {
list.pushEnd(children, child.clone())
}
this.childCnt += other.childCnt
prevLast?.next && tryMergeWithPrev(children, prevLast.next)
// @ts-ignore
return this
}
}
/**
* @param {ChildrenOpAny} op
* @param {{[k:string]:any}} formatUpdate
*/
const updateOpFormat = (op, formatUpdate) => {
if (!$deleteOp.check(op)) {
// apply formatting attributes
for (const k in formatUpdate) {
const v = formatUpdate[k]
if (v != null || $retainOp.check(op)) {
// never modify formats
/** @type {any} */ (op).format = object.assign({}, op.format, { [k]: v })
} else if (op.format != null) {
const { [k]: _, ...rest } = op.format
;/** @type {any} */ (op).format = rest
}
}
}
}
/**
* @template {DeltaAny} D
* @typedef {D extends DeltaBuilder<infer N,infer Attrs,infer Children,infer Text,infer Schema> ? Delta<N,Attrs,Children,Text,Schema> : D} CastToDelta
*/
/**
* @template {string} NodeName
* @template {{ [key: string|number]: any }} [Attrs={}]
* @template {fingerprintTrait.Fingerprintable|never} [Children=never]
* @template {string|never} [Text=never]
* @typedef {Delta<NodeName,Attrs,Children|Delta<NodeName,Attrs,Children,Text>|RecursiveDelta<NodeName,Attrs,Children,Text>,Text>} RecursiveDelta
*/
/**
* @template {string} Name
* @template {{[k:string|number]:any}} Attrs
* @template {fingerprintTrait.Fingerprintable} Children
* @template {boolean} HasText
* @template {{ [k:string]:any }} Formats
* @template {boolean} Recursive
* @extends {s.Schema<Delta<
* Name,
* Attrs,
* Children|(Recursive extends true ? RecursiveDelta<Name,Attrs,Children,HasText extends true ? string : never> : never),
* HasText extends true ? string : never,
* any>>}
*/
export class $Delta extends s.Schema {
/**
* @param {s.Schema<Name>} $name
* @param {s.Schema<Attrs>} $attrs
* @param {s.Schema<Children>} $children
* @param {HasText} hasText
* @param {s.Schema<Formats>} $formats
* @param {Recursive} recursive
*/
constructor ($name, $attrs, $children, hasText, $formats, recursive) {
super()
const $attrsPartial = s.$$object.check($attrs) ? $attrs.partial : $attrs
if (recursive) {
// @ts-ignore
$children = s.$union($children, this)
}
this.shape = { $name, $attrs: $attrsPartial, $children, hasText, $formats }
}
/**
* @param {any} o
* @param {s.ValidationError} [err]
* @return {o is Delta<
* Name,
* Attrs,
* Children|(Recursive extends true ? RecursiveDelta<Name,Attrs,Children,HasText extends true ? string : never> : never),
* HasText extends true ? string : never,
* any>}
*/
check (o, err = undefined) {
const { $name, $attrs, $children, hasText, $formats } = this.shape
if (!(o instanceof Delta)) {
err?.extend(null, 'Delta', o?.constructor.name, 'Constructor match failed')
} else if (o.name != null && !$name.check(o.name, err)) {
err?.extend('Delta.name', $name.toString(), o.name, 'Unexpected node name')
} else if (list.toArray(o.children).some(c => (!hasText && $textOp.check(c)) || (hasText && $textOp.check(c) && c.format != null && !$formats.check(c.format)) || ($insertOp.check(c) && !c.insert.every(ins => $children.check(ins))))) {
err?.extend('Delta.children', '', '', 'Children don\'t match the schema')
} else if (object.some(o.attrs, (op, k) => $insertOp.check(op) && !$attrs.check({ [k]: op.value }, err))) {
err?.extend('Delta.attrs', '', '', 'Attrs don\'t match the schema')
} else {
return true
}
return false
}
}
/**
* @template {s.Schema<string>|string|Array<string>} [NodeNameSchema=s.Schema<any>]
* @template {s.Schema<{ [key: string|number]: any }>|{ [key:string|number]:any }} [AttrsSchema=s.Schema<{}>]
* @template {any} [ChildrenSchema=s.Schema<never>]
* @template {boolean} [HasText=false]
* @template {boolean} [Recursive=false]
* @template {{ [k:string]:any }} [Formats={[k:string]:any}]
* @param {object} opts
* @param {NodeNameSchema?} [opts.name]
* @param {AttrsSchema?} [opts.attrs] What key-value pairs are included.
* @param {ChildrenSchema?} [opts.children] The type of content in `insertOp`
* @param {HasText} [opts.text] Whether this delta contains text using `textOp`
* @param {Formats} [opts.formats]
* @param {Recursive} [opts.recursive]
* @return {[s.Unwrap<s.ReadSchema<NodeNameSchema>>,s.Unwrap<s.ReadSchema<AttrsSchema>>,s.Unwrap<s.ReadSchema<ChildrenSchema>>] extends [infer NodeName, infer Attrs, infer Children] ? s.Schema<Delta<
* NodeName,
* Attrs,
* Children|(Recursive extends true ? RecursiveDelta<NodeName,Attrs,Children,HasText extends true ? string : never> : never),
* HasText extends true ? string : never
* >> : never}
*/
export const $delta = ({ name, attrs, children, text, formats, recursive }) => /** @type {any} */ (new $Delta(
name == null ? s.$any : s.$(name),
/** @type {any} */ (attrs == null ? s.$object({}) : s.$(attrs)),
/** @type {any} */ (children == null ? s.$never : s.$(children)),
text ?? false,
formats == null ? s.$any : s.$(formats),
recursive ?? false
))
export const $$delta = s.$constructedBy($Delta)
/**
* @todo remove this
*
* @template {s.Schema<string>|string|Array<string>} [NodeNameSchema=s.Schema<any>]
* @template {s.Schema<{ [key: string|number]: any }>|{ [key:string|number]:any }} [AttrsSchema=s.Schema<{}>]
* @template {any} [ChildrenSchema=s.Schema<never>]
* @template {boolean} [HasText=false]
* @template {boolean} [Recursive=false]
* @param {object} opts
* @param {NodeNameSchema?} [opts.name]
* @param {AttrsSchema?} [opts.attrs]
* @param {ChildrenSchema?} [opts.children]
* @param {HasText} [opts.text]
* @param {Recursive} [opts.recursive]
* @return {[s.Unwrap<s.ReadSchema<NodeNameSchema>>,s.Unwrap<s.ReadSchema<AttrsSchema>>,s.Unwrap<s.ReadSchema<ChildrenSchema>>] extends [infer NodeName, infer Attrs, infer Children] ? s.Schema<Delta<
* NodeName,
* Attrs,
* Children|(Recursive extends true ? RecursiveDelta<NodeName,Attrs,Children,HasText extends true ? string : never> : never),
* HasText extends true ? string : never
* >> : never}
*/
export const _$delta = ({ name, attrs, children, text, recursive }) => {
/**
* @type {s.Schema<Array<any>>}
*/
let $arrContent = children == null ? s.$never : s.$array(s.$(children))
const $name = name == null ? s.$any : s.$(name)
const $attrsPartial = attrs == null ? s.$object({}) : (s.$$record.check(attrs) ? attrs : /** @type {any} */ (s.$(attrs)).partial)
const $d = s.$instanceOf(Delta, /** @param {Delta<any,any,any,any,any>} d */ d => {
if (
!$name.check(d.name) ||
object.some(d.attrs,
(op, k) => $insertOp.check(op) && !$attrsPartial.check({ [k]: op.value })
)
) return false
for (const op of d.children) {
if ((!text && $textOp.check(op)) || ($insertOp.check(op) && !$arrContent.check(op.insert))) {
return false
}
}
return true
})
if (recursive) {
$arrContent = children == null ? s.$array($d) : s.$array(s.$(children), $d)
}
return /** @type {any} */ ($d)
}
/**
* @type {s.Schema<DeltaAny>}
*/
export const $deltaAny = /** @type {any} */ (s.$instanceOf(Delta))
/**
* @type {s.Schema<DeltaBuilderAny>}
*/
export const $deltaBuilderAny = /** @type {any} */ (s.$instanceOf(DeltaBuilder))
/**
* Helper function to merge attribution and attributes. The latter input "wins".
*
* @template {{ [key: string]: any }} T
* @param {T | null} a
* @param {T | null} b
*/
export const mergeAttrs = (a, b) => object.isEmpty(a)
? (object.isEmpty(b) ? null : b)
: (object.isEmpty(b) ? a : object.assign({}, a, b))
/**
* @template {DeltaAny|null} D
* @param {D} a
* @param {D} b
* @return {D}
*/
export const mergeDeltas = (a, b) => {
if (a != null && b != null) {
const c = clone(a)
c.apply(b)
return /** @type {any} */ (c)
}
return a == null ? b : (a || null)
}
/**
* @template {DeltaAny} D
* @param {prng.PRNG} gen
* @param {s.Schema<D>} $d
* @return {D extends Delta<infer NodeName,infer Attrs,infer Children,infer Text,infer Schema> ? DeltaBuilder<NodeName,Attrs,Children,Text,Schema> : never}
*/
export const random = (gen, $d) => {
const { $name, $attrs, $children, hasText, $formats: $formats_ } = /** @type {$Delta<any,any,any,boolean,any,any>} */ (/** @type {any} */ ($d)).shape
const d = s.$$any.check($name) ? create($deltaAny) : create(s.random(gen, $name), $deltaAny)
const $formats = s.$$any.check($formats_) ? s.$null : $formats_
prng.bool(gen) && d.setMany(s.random(gen, $attrs))
for (let i = prng.uint32(gen, 0, 5); i > 0; i--) {
if (hasText && prng.bool(gen)) {
d.insert(prng.word(gen), s.random(gen, $formats))
} else if (!s.$$never.check($children)) {
/**
* @type {Array<any>}
*/
const ins = []
let insN = prng.int32(gen, 0, 5)
while (insN--) {
ins.push(s.random(gen, $children))
}
d.insert(ins, s.random(gen, $formats))
}
}
return /** @type {any} */ (d)
}
/**
* @overload
* @return {DeltaBuilder<any,{},never,never,null>}
*/
/**
* @template {string} NodeName
* @overload
* @param {NodeName} nodeName
* @return {DeltaBuilder<NodeName,{},never,never,null>}
*/
/**
* @template {string} NodeName
* @template {s.Schema<DeltaAny>} Schema
* @overload
* @param {NodeName} nodeName
* @param {Schema} schema
* @return {Schema extends s.Schema<Delta<infer N,infer Attrs,infer Children,infer Text,any>> ? DeltaBuilder<NodeName,Attrs,Children,Text,Schema> : never}
*/
/**
* @template {s.Schema<DeltaAny>} Schema
* @overload
* @param {Schema} schema
* @return {Schema extends s.Schema<Delta<infer N,infer Attrs,infer Children,infer Text,any>> ? DeltaBuilder<N,Attrs,Children,Text,Schema> : never}
*/
/**
* @template {string|null} NodeName
* @template {{[k:string|number]:any}|null} Attrs
* @template {Array<any>|string} [Children=never]
* @overload
* @param {NodeName} nodeName
* @param {Attrs} attrs
* @param {Children} [children]
* @return {DeltaBuilder<
* NodeName extends null ? any : NodeName,
* Attrs extends null ? {} : Attrs,
* Extract<Children,Array<any>> extends Array<infer Ac> ? (unknown extends Ac ? never : Ac) : never,
* Extract<Children,string>,
* null
* >}
*/
/**
* @param {string|s.Schema<DeltaAny>} [nodeNameOrSchema]
* @param {{[K:string|number]:any}|s.Schema<DeltaAny>} [attrsOrSchema]
* @param {(Array<any>|string)} [children]
* @return {DeltaBuilder<any,any,any,any,any>}
*/
export const create = (nodeNameOrSchema, attrsOrSchema, children) => {
const nodeName = /** @type {any} */ (s.$string.check(nodeNameOrSchema) ? nodeNameOrSchema : null)
const schema = /** @type {any} */ (s.$$schema.check(nodeNameOrSchema) ? nodeNameOrSchema : (s.$$schema.check(attrsOrSchema) ? attrsOrSchema : null))
const d = /** @type {DeltaBuilder<any,any,any,string,null>} */ (new DeltaBuilder(nodeName, schema))
if (s.$objectAny.check(attrsOrSchema)) {
d.setMany(attrsOrSchema)
}
children && d.insert(children)
return d
}
// DELTA TEXT
/**
* @template {fingerprintTrait.Fingerprintable} [Embeds=never]
* @typedef {Delta<any,{},Embeds,string>} TextDelta
*/
/**
* @template {fingerprintTrait.Fingerprintable} [Embeds=never]
* @typedef {DeltaBuilder<any,{},Embeds,string>} TextDeltaBuilder
*/
/**
* @template {Array<s.Schema<any>>} [$Embeds=any]
* @param {$Embeds} $embeds
* @return {s.Schema<TextDelta<_AnyToNull<$Embeds> extends null ? never : ($Embeds extends Array<s.Schema<infer $C>> ? $C : never)>>}
*/
export const $text = (...$embeds) => /** @type {any} */ ($delta({ children: s.$union(...$embeds), text: true }))
export const $textOnly = $text()
/**
* @template {s.Schema<Delta<any,{},any,any,null>>} [Schema=s.Schema<Delta<any,{},never,string,null>>]
* @param {Schema} [$schema]
* @return {Schema extends s.Schema<Delta<infer N,infer Attrs,infer Children,infer Text,any>> ? DeltaBuilder<N,Attrs,Children,Text,Schema> : never}
*/
export const text = $schema => /** @type {any} */ (create($schema || $textOnly))
/**
* @template {fingerprintTrait.Fingerprintable} Children
* @typedef {Delta<any,{},Children,never>} ArrayDelta
*/
/**
* @template {fingerprintTrait.Fingerprintable} Children
* @typedef {DeltaBuilder<any,{},Children,never>} ArrayDeltaBuilder
*/
/**
* @template {any|s.Schema<any>} $Children
* @param {$Children} [$children]
* @return {s.Schema<ArrayDelta<s.Unwrap<s.ReadSchema<$Children>>>>}
*/
export const $array = $children => /** @type {any} */ ($delta({ children: $children }))
/**
* @template {s.Schema<ArrayDelta<any>>} [$Schema=never]
* @param {$Schema} $schema
* @return {$Schema extends never ? ArrayDeltaBuilder<never> : DeltaBuilder<any,{},never,never,$Schema>}
*/
export const array = $schema => /** @type {any} */ ($schema ? create($schema) : create())
/**
* @template {{ [K: string|number]: any }} Attrs
* @typedef {Delta<any,Attrs,never,never>} MapDelta
*/
/**
* @template {{ [K: string|number]: any }} Attrs
* @typedef {DeltaBuilder<any,Attrs,never,never>} MapDeltaBuilder
*/
/**
* @template {{ [K: string|number]: any }} $Attrs
* @param {s.Schema<$Attrs>} $attrs
* @return {s.Schema<MapDelta<$Attrs>>}
*/
export const $map = $attrs => /** @type {any} */ ($delta({ attrs: $attrs }))
/**
* @template {s.Schema<MapDelta<any>>|undefined} [$Schema=undefined]
* @param {$Schema} [$schema]
* @return {$Schema extends s.Schema<MapDelta<infer Attrs>> ? DeltaBuilder<any,Attrs,never,never,$Schema> : MapDeltaBuilder<{}>}
*/
export const map = $schema => /** @type {any} */ (create(/** @type {any} */ ($schema)))
/**
* @template {DeltaAny} D
* @param {D} d1
* @param {NoInfer<D>} d2
* @return {D extends Delta<infer N,infer Attrs,infer Children,infer Text,any> ? DeltaBuilder<N,Attrs,Children,Text,null> : never}
*/
export const diff = (d1, d2) => {
/**
* @type {DeltaBuilderAny}
*/
const d = create()
if (d1.fingerprint !== d2.fingerprint) {
let left1 = d1.children.start
let left2 = d2.children.start
let right1 = d1.children.end
let right2 = d2.children.end
let commonPrefixOffset = 0
// perform a patience sort
// 1) remove common prefix and suffix
while (left1 != null && left1.fingerprint === left2?.fingerprint) {
if (!$deleteOp.check(left1)) {
commonPrefixOffset += left1.length
}
left1 = left1.next
left2 = left2.next
}
while (right1 !== null && right1 !== left1 && right1.fingerprint === right2?.fingerprint) {
right1 = right1.prev
right2 = right2.prev
}
/**
* @type {Array<ChildrenOpAny>}
*/
const ops1 = []
/**
* @type {Array<ChildrenOpAny>}
*/
const ops2 = []
while (left1 !== null && left1 !== right1?.next) {
ops1.push(left1)
left1 = left1.next
}
while (left2 !== null && left2 !== right2?.next) {
ops2.push(left2)
left2 = left2.next
}
const fprints1 = ops1.map(op => op.fingerprint)
const fprints2 = ops2.map(op => op.fingerprint)
const changeset = patience.diff(fprints1, fprints2)
d.retain(commonPrefixOffset)
for (let i = 0, lastIndex1 = 0, currIndexOffset2 = 0; i < changeset.length; i++) {
const change = changeset[i]
d.retain(change.index - lastIndex1)
// insert minimal diff at curred position in d
/**
*
* @todo it would be better if these would be slices of delta (an actual delta)
*
* @param {ChildrenOpAny[]} opsIs
* @param {ChildrenOpAny[]} opsShould
*/
const diffAndApply = (opsIs, opsShould) => {
const d = create()
// @todo unoptimized implementation. Convert content to array and diff that based on
// generated fingerprints. We probably could do better and cache more information.
// - benchmark
// - cache fingerprints in ops
/**
* @type {Array<string|DeltaAny|fingerprintTrait.Fingerprintable>}
*/
const isContent = opsIs.flatMap(op => $insertOp.check(op) ? op.insert : ($textOp.check(op) ? op.insert.split('') : error.unexpectedCase()))
/**
* @type {Array<string|DeltaAny|fingerprintTrait.Fingerprintable>}
*/
const shouldContent = opsShould.flatMap(op => $insertOp.check(op) ? op.insert : ($textOp.check(op) ? op.insert.split('') : error.unexpectedCase()))
const isContentFingerprinted = isContent.map(c => s.$string.check(c) ? c : fingerprintTrait.fingerprint(c))
const shouldContentFingerprinted = shouldContent.map(c => s.$string.check(c) ? c : fingerprintTrait.fingerprint(c))
const hasFormatting = opsIs.some(op => !$deleteOp.check(op) && op.format != null) || opsShould.some(op => !$deleteOp.check(op) && op.format != null)
/**
* @type {{ index: number, insert: Array<string|DeltaAny|fingerprintTrait.Fingerprintable>, remove: Array<string|DeltaAny|fingerprintTrait.Fingerprintable> }[]}
*/
const cdiff = patience.diff(isContentFingerprinted, shouldContentFingerprinted)
// overwrite fingerprinted content with actual content
for (let i = 0, adj = 0; i < cdiff.length; i++) {
const cd = cdiff[i]
cd.remove = isContent.slice(cd.index, cd.index + cd.remove.length)
cd.insert = shouldContent.slice(cd.index + adj, cd.index + adj + cd.insert.length)
adj += cd.insert.length - cd.remove.length
}
for (let i = 0, lastIndex = 0; i < cdiff.length; i++) {
const cd = cdiff[i]
d.retain(cd.index - lastIndex)
lastIndex = cd.index
let cdii = 0
let cdri = 0
// try to match as much content as possible, preferring to skip over non-deltas
for (; cdii < cd.insert.length && cdri < cd.remove.length;) {
const a = cd.insert[cdii]
const b = cd.remove[cdri]
if ($deltaAny.check(a) && $deltaAny.check(b) && a.name === b.name) {
d.modify(diff(b, a))
cdii++
cdri++
} else if ($deltaAny.check(b)) {
d.insert(s.$string.check(a) ? a : [a])
cdii++
} else {
d.delete(1)
cdri++
}
}
for (; cdii < cd.insert.length; cdii++) {
const a = cd.insert[cdii]
d.insert(s.$string.check(a) ? a : [a])
}
d.delete(cd.remove.length - cdri)
}
// create the diff for formatting
if (hasFormatting) {
const formattingDiff = create()
// update opsIs with content diff. then we can figure out the formatting diff.
const isUpdated = create()
// copy opsIs to fresh delta
opsIs.forEach(op => {
isUpdated.childCnt += op.length
list.pushEnd(isUpdated.children, op.clone())
})
isUpdated.apply(d)
let shouldI = 0
let shouldOffset = 0
let isOp = isUpdated.children.start
let isOffset = 0
while (shouldI < opsShould.length && isOp != null) {
const shouldOp = opsShould[shouldI]
if (!$deleteOp.check(shouldOp) && !$deleteOp.check(isOp)) {
const isFormat = isOp.format
const minForward = math.min(shouldOp.length - shouldOffset, isOp.length - isOffset)
shouldOffset += minForward
isOffset += minForward
if (fun.equalityDeep(shouldOp.format, isFormat)) {
formattingDiff.retain(minForward)
} else {
/**
* @type {FormattingAttributes}
*/
const fupdate = {}
shouldOp.format != null && object.forEach(shouldOp.format, (v, k) => {
if (!fun.equalityDeep(v, isFormat?.[k] || null)) {
fupdate[k] = v
}
})
isFormat && object.forEach(isFormat, (_, k) => {
if (shouldOp?.format?.[k] === undefined) {
fupdate[k] = null
}
})
formattingDiff.retain(minForward, fupdate)
}
// update offset and iterators
if (shouldOffset >= shouldOp.length) {
shouldI++
shouldOffset = 0
}
if (isOffset >= isOp.length) {
isOp = isOp.next
isOffset = 0
}
}
}
d.apply(formattingDiff)
}
return d
}
const subd = diffAndApply(ops1.slice(change.index, change.index + change.remove.length), ops2.slice(change.index + currIndexOffset2, change.index + currIndexOffset2 + change.insert.length))
d.append(subd)
lastIndex1 = change.index + change.remove.length
currIndexOffset2 += change.insert.length - change.remove.length
}
for (const attr2 of d2.attrs) {
const attr1 = d1.attrs[attr2.key]
if (attr1 == null || (attr1.fingerprint !== attr2.fingerprint)) {
/* c8 ignore else */
if ($insertOp.check(attr2)) {
d.set(attr2.key, attr2.value)
} else {
/* c8 ignore next 2 */
error.unexpectedCase()
}
}
}
for (const attr1 of d1.attrs) {
if (d2.attrs[attr1.key] == null) {
d.unset(attr1.key)
}
}
}
return /** @type {any} */ (d.done(false))
}