111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
/**
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* @module structs
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*/
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// TODO: ItemBinary should be able to merge with right (similar to other items). Or the other items (ItemJSON) should not be able to merge - extra byte + consistency
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import {
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AbstractItem,
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AbstractItemRef,
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getItemCleanEnd,
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getItemCleanStart,
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getItemType,
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GC,
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ItemDeleted,
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Transaction, ID, AbstractType // eslint-disable-line
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} from '../internals.js'
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import * as encoding from 'lib0/encoding.js'
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import * as decoding from 'lib0/decoding.js'
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export const structBinaryRefNumber = 1
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export class ItemBinary extends AbstractItem {
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/**
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* @param {ID} id
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* @param {AbstractItem | null} left
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* @param {ID | null} origin
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* @param {AbstractItem | null} right
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* @param {ID | null} rightOrigin
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* @param {AbstractType<any>} parent
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* @param {string | null} parentSub
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* @param {ArrayBuffer} content
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*/
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constructor (id, left, origin, right, rightOrigin, parent, parentSub, content) {
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super(id, left, origin, right, rightOrigin, parent, parentSub)
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this.content = content
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}
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getContent () {
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return [this.content]
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}
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/**
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* @param {ID} id
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* @param {AbstractItem | null} left
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* @param {ID | null} origin
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* @param {AbstractItem | null} right
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* @param {ID | null} rightOrigin
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* @param {AbstractType<any>} parent
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* @param {string | null} parentSub
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*/
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copy (id, left, origin, right, rightOrigin, parent, parentSub) {
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return new ItemBinary(id, left, origin, right, rightOrigin, parent, parentSub, this.content)
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}
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/**
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* @param {encoding.Encoder} encoder
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* @param {number} offset
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*/
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write (encoder, offset) {
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super.write(encoder, offset, structBinaryRefNumber)
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encoding.writePayload(encoder, this.content)
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}
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}
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export class ItemBinaryRef extends AbstractItemRef {
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/**
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* @param {decoding.Decoder} decoder
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* @param {ID} id
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* @param {number} info
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*/
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constructor (decoder, id, info) {
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super(decoder, id, info)
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/**
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* @type {ArrayBuffer}
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*/
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this.content = decoding.readPayload(decoder)
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}
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/**
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* @param {Transaction} transaction
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* @param {number} offset
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* @return {ItemBinary|GC}
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*/
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toStruct (transaction, offset) {
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const y = transaction.y
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const store = y.store
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let parent
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if (this.parent !== null) {
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const parentItem = getItemType(store, this.parent)
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switch (parentItem.constructor) {
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case ItemDeleted:
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case GC:
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return new GC(this.id, 1)
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}
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parent = parentItem.type
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} else {
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// @ts-ignore
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parent = y.get(this.parentYKey)
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}
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return new ItemBinary(
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this.id,
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this.left === null ? null : getItemCleanEnd(store, this.left),
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this.left,
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this.right === null ? null : getItemCleanStart(store, this.right),
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this.right,
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parent,
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this.parentSub,
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this.content
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)
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}
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}
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