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import { merge } from "../core/utils.ts";
import type { Element } from "../deps/dom.ts";import type { Page, Site } from "../core.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions: string[];
  /** The function to generate the new url */  fn: (url: string, page: Page) => string;}
// Default optionsexport const defaults: Options = {  extensions: [".html"],  fn: (url) => url,};
/** A plugin to modify all URLs found in the HTML documents */export default function (userOptions?: Partial<Options>) {  const options = merge(defaults, userOptions);
  const replace = (url: string | null, page: Page) => {    return url ? options.fn(url, page) : "";  };
  return (site: Site) => {    site.process(options.extensions, (page: Page) => {      page.document?.querySelectorAll("[href]").forEach((node) => {        const element = node as Element;        element.setAttribute(          "href",          replace(element.getAttribute("href"), page),        );      });
      page.document?.querySelectorAll("[src]").forEach((node) => {        const element = node as Element;        element.setAttribute("src", replace(element.getAttribute("src"), page));      });
      const srcsetUrlRegex =        /(?<=^\s*|,\s+|\s,+|\s[^\s,]+,+)[^\s,](?:\S*[^\s,])?/g;
      page.document?.querySelectorAll("[srcset]").forEach((node) => {        const element = node as Element;        element.setAttribute(          "srcset",          element.getAttribute("srcset")!.replace(            srcsetUrlRegex,            (url: string) => replace(url, page),          ),        );      });
      page.document?.querySelectorAll("[imagesrcset]").forEach((node) => {        const element = node as Element;        element.setAttribute(          "imagesrcset",          element.getAttribute("imagesrcset")!.replace(            srcsetUrlRegex,            (url: string) => replace(url, page),          ),        );      });    });  };}