prelim refactor commit

src/structs/ItemDeleted.js

@@ -0,0 +1,83 @@
+/**
+ * @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, logItemHelper, AbstractItemRef } from './AbstractItem.js'
+import * as encoding from 'lib0/encoding.js'
+import * as decoding from 'lib0/decoding.js'
+import { ID } from '../utils/ID.js' // eslint-disable-line
+import { ItemType } from './ItemType.js' // eslint-disable-line
+import { Y } from '../utils/Y.js' // eslint-disable-line
+
+export const structDeletedRefNumber = 2
+
+export class ItemBinary extends AbstractItem {
+  /**
+   * @param {ID} id
+   * @param {AbstractItem | null} left
+   * @param {AbstractItem | null} right
+   * @param {ItemType | null} parent
+   * @param {string | null} parentSub
+   * @param {ArrayBuffer} content
+   */
+  constructor (id, left, right, parent, parentSub, content) {
+    super(id, left, right, parent, parentSub)
+    this.content = content
+  }
+  /**
+   * @param {ID} id
+   * @param {AbstractItem | null} left
+   * @param {AbstractItem | null} right
+   * @param {ItemType | null} parent
+   * @param {string | null} parentSub
+   */
+  copy (id, left, right, parent, parentSub) {
+    return new ItemBinary(id, left, right, parent, parentSub, this.content)
+  }
+  /**
+   * Transform this Type to a readable format.
+   * Useful for logging as all Items and Delete implement this method.
+   *
+   * @private
+   */
+  logString () {
+    return logItemHelper('ItemBinary', this)
+  }
+  /**
+   * @param {encoding.Encoder} encoder
+   */
+  write (encoder) {
+    super.write(encoder, structDeletedRefNumber)
+    encoding.writePayload(encoder, this.content)
+  }
+}
+
+export class ItemDeletedRef extends AbstractItemRef {
+  /**
+   * @param {decoding.Decoder} decoder
+   * @param {number} info
+   */
+  constructor (decoder, info) {
+    super(decoder, info)
+    /**
+     * @type {ArrayBuffer}
+     */
+    this.content = decoding.readPayload(decoder)
+  }
+  /**
+   * @param {Y} y
+   * @return {ItemBinary}
+   */
+  toStruct (y) {
+    return new ItemBinary(
+      this.id,
+      this.left === null ? null : y.os.getItemCleanEnd(this.left),
+      this.right === null ? null : y.os.getItemCleanStart(this.right),
+      this.parent === null ? null : y.os.getItem(this.parent),
+      this.parentSub,
+      this.content
+    )
+  }
+}