BookStack Code Mirror - bookstack/blob - resources/js/wysiwyg/services/node-clipboard.ts

   1 import {$isElementNode, LexicalEditor, LexicalNode, SerializedLexicalNode} from "lexical";
   2
   3 type SerializedLexicalNodeWithChildren = {
   4     node: SerializedLexicalNode,
   5     children: SerializedLexicalNodeWithChildren[],
   6 };
   7
   8 function serializeNodeRecursive(node: LexicalNode): SerializedLexicalNodeWithChildren {
   9     const childNodes = $isElementNode(node) ? node.getChildren() : [];
  10     return {
  11         node: node.exportJSON(),
  12         children: childNodes.map(n => serializeNodeRecursive(n)),
  13     };
  14 }
  15
  16 function unserializeNodeRecursive(editor: LexicalEditor, {node, children}: SerializedLexicalNodeWithChildren): LexicalNode|null {
  17     const instance = editor._nodes.get(node.type)?.klass.importJSON(node);
  18     if (!instance) {
  19         return null;
  20     }
  21
  22     const childNodes = children.map(child => unserializeNodeRecursive(editor, child));
  23     for (const child of childNodes) {
  24         if (child && $isElementNode(instance)) {
  25             instance.append(child);
  26         }
  27     }
  28
  29     return instance;
  30 }
  31
  32 export class NodeClipboard<T extends LexicalNode> {
  33     nodeClass: {importJSON: (s: SerializedLexicalNode) => T};
  34     protected store: SerializedLexicalNodeWithChildren[] = [];
  35
  36     constructor(nodeClass: {importJSON: (s: any) => T}) {
  37         this.nodeClass = nodeClass;
  38     }
  39
  40     set(...nodes: LexicalNode[]): void {
  41         this.store.splice(0, this.store.length);
  42         for (const node of nodes) {
  43             this.store.push(serializeNodeRecursive(node));
  44         }
  45     }
  46
  47     get(editor: LexicalEditor): LexicalNode[] {
  48         return this.store.map(json => unserializeNodeRecursive(editor, json)).filter((node) => {
  49             return node !== null;
  50         });
  51     }
  52
  53     size(): number {
  54         return this.store.length;
  55     }
  56 }