初始化

康凯

2022-05-20 aa4c235a8ca67ea8b731f90c951a465e92c0a865

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"use strict";
 
const HTMLElementImpl = require("./HTMLElement-impl").implementation;
 
const Document = require("../generated/Document");
const DocumentFragment = require("../generated/DocumentFragment");
 
const { cloningSteps, domSymbolTree } = require("../helpers/internal-constants");
const { clone } = require("../node");
 
class HTMLTemplateElementImpl extends HTMLElementImpl {
  constructor(args, privateData) {
    super(args, privateData);
 
    const doc = this._appropriateTemplateContentsOwnerDocument(this._ownerDocument);
    this._templateContents = DocumentFragment.createImpl([], {
      ownerDocument: doc,
      host: this
    });
  }
 
  // https://html.spec.whatwg.org/multipage/scripting.html#appropriate-template-contents-owner-document
  _appropriateTemplateContentsOwnerDocument(doc) {
    if (!doc._isInertTemplateDocument) {
      if (doc._associatedInertTemplateDocument === undefined) {
        const newDoc = Document.createImpl([], {
          options: {
            parsingMode: doc._parsingMode,
            encoding: doc._encoding
          }
        });
        newDoc._isInertTemplateDocument = true;
 
        doc._associatedInertTemplateDocument = newDoc;
      }
 
      doc = doc._associatedInertTemplateDocument;
    }
 
    return doc;
  }
 
  // https://html.spec.whatwg.org/multipage/scripting.html#template-adopting-steps
  _adoptingSteps() {
    const doc = this._appropriateTemplateContentsOwnerDocument(this._ownerDocument);
    doc._adoptNode(this._templateContents);
  }
 
  get content() {
    return this._templateContents;
  }
 
  [cloningSteps](copy, node, document, cloneChildren) {
    if (!cloneChildren) {
      return;
    }
 
    for (const child of domSymbolTree.childrenIterator(node._templateContents)) {
      const childCopy = clone(child, copy._templateContents._ownerDocument, true);
      copy._templateContents.appendChild(childCopy);
    }
  }
}
 
module.exports = {
  implementation: HTMLTemplateElementImpl
};