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import { CTOR_KEY } from "../constructor-lock.ts";import { nodesFromString } from "../deserialize.ts";import { DocumentType, HTMLDocument } from "./document.ts";import type { Element } from "./element.ts";
export type DOMParserMimeType =  | "text/html"  | "text/xml"  | "application/xml"  | "application/xhtml+xml"  | "image/svg+xml";
export class DOMParser {  parseFromString(    source: string,    mimeType: DOMParserMimeType,  ): HTMLDocument | null {    if (mimeType !== "text/html") {      throw new Error(`DOMParser: "${mimeType}" unimplemented`); // TODO    }
    const doc = new HTMLDocument(CTOR_KEY);
    const fakeDoc = nodesFromString(source);    let htmlNode: Element | null = null;    let hasDoctype = false;
    for (const child of [...fakeDoc.childNodes]) {      doc.appendChild(child);
      if (child instanceof DocumentType) {        hasDoctype = true;      } else if (child.nodeName === "HTML") {        htmlNode = <Element> child;      }    }
    if (!hasDoctype) {      const docType = new DocumentType("html", "", "", CTOR_KEY);      // doc.insertBefore(docType, doc.firstChild);      if (doc.childNodes.length === 0) {        doc.appendChild(docType);      } else {        doc.insertBefore(docType, doc.childNodes[0]);      }    }
    if (htmlNode) {      for (const child of htmlNode.childNodes) {        switch ((<Element> child).tagName) {          case "HEAD":            doc.head = <Element> child;            break;          case "BODY":            doc.body = <Element> child;            break;        }      }    }
    return doc;  }}