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export default class Search {  #site = null;
  constructor(site) {    this.#site = site;  }
  folder(path = "/") {    return this.#site.source.getDirectory(path);  }
  pages(tags, sort) {    return this.#searchPages(tags, sort);  }
  nextPage(url, tags, sort) {    const pages = this.pages(tags, sort);    const index = pages.findIndex((page) => page.data.url === url);
    return (index === -1) ? undefined : pages[index + 1];  }
  previousPage(url, tags, sort) {    const pages = this.pages(tags, sort);    const index = pages.findIndex((page) => page.data.url === url);
    return (index <= 0) ? undefined : pages[index - 1];  }
  #searchPages(tags = [], sort = "date") {    tags = getTags(tags);
    const filter = (page) => {      if (page.dest.ext !== ".html") {        return false;      }
      if (tags && !tags.every((tag) => page.tags.has(tag))) {        return false;      }
      return true;    };
    return this.#site.pages      .filter(filter)      .sort(sort === "file" ? sortByFilename : sortByDate);  }}
function getTags(tags) {  if (typeof tags === "string") {    tags = tags.split(/\s+/).filter((tag) => tag);  }
  return tags.length ? tags : null;}
function sortByDate(a, b) {  return a.data.date - b.data.date;}
function sortByFilename(a, b) {  return (a.src.path < b.src.path) ? -1 : 1;}