yjs/src/structs/ItemBinary.js
2019-04-05 19:46:18 +02:00

111 lines
2.8 KiB
JavaScript

/**
* @module structs
*/
// 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
import {
AbstractItem,
AbstractItemRef,
getItemCleanEnd,
getItemCleanStart,
getItemType,
GC,
ItemDeleted,
Transaction, ID, AbstractType // eslint-disable-line
} from '../internals.js'
import * as encoding from 'lib0/encoding.js'
import * as decoding from 'lib0/decoding.js'
export const structBinaryRefNumber = 1
export class ItemBinary extends AbstractItem {
/**
* @param {ID} id
* @param {AbstractItem | null} left
* @param {ID | null} origin
* @param {AbstractItem | null} right
* @param {ID | null} rightOrigin
* @param {AbstractType<any>} parent
* @param {string | null} parentSub
* @param {ArrayBuffer} content
*/
constructor (id, left, origin, right, rightOrigin, parent, parentSub, content) {
super(id, left, origin, right, rightOrigin, parent, parentSub)
this.content = content
}
getContent () {
return [this.content]
}
/**
* @param {ID} id
* @param {AbstractItem | null} left
* @param {ID | null} origin
* @param {AbstractItem | null} right
* @param {ID | null} rightOrigin
* @param {AbstractType<any>} parent
* @param {string | null} parentSub
*/
copy (id, left, origin, right, rightOrigin, parent, parentSub) {
return new ItemBinary(id, left, origin, right, rightOrigin, parent, parentSub, this.content)
}
/**
* @param {encoding.Encoder} encoder
* @param {number} offset
*/
write (encoder, offset) {
super.write(encoder, offset, structBinaryRefNumber)
encoding.writePayload(encoder, this.content)
}
}
export class ItemBinaryRef extends AbstractItemRef {
/**
* @param {decoding.Decoder} decoder
* @param {ID} id
* @param {number} info
*/
constructor (decoder, id, info) {
super(decoder, id, info)
/**
* @type {ArrayBuffer}
*/
this.content = decoding.readPayload(decoder)
}
/**
* @param {Transaction} transaction
* @param {number} offset
* @return {ItemBinary|GC}
*/
toStruct (transaction, offset) {
const y = transaction.y
const store = y.store
let parent
if (this.parent !== null) {
const parentItem = getItemType(store, this.parent)
switch (parentItem.constructor) {
case ItemDeleted:
case GC:
return new GC(this.id, 1)
}
parent = parentItem.type
} else {
// @ts-ignore
parent = y.get(this.parentYKey)
}
return new ItemBinary(
this.id,
this.left === null ? null : getItemCleanEnd(store, this.left),
this.left,
this.right === null ? null : getItemCleanStart(store, this.right),
this.right,
parent,
this.parentSub,
this.content
)
}
}