import micromorph from "micromorph"
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import { CanonicalSlug, RelativeURL, getCanonicalSlug } from "../../util/path"
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// adapted from `micromorph`
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// https://github.com/natemoo-re/micromorph
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const NODE_TYPE_ELEMENT = 1
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let announcer = document.createElement("route-announcer")
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const isElement = (target: EventTarget | null): target is Element =>
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(target as Node)?.nodeType === NODE_TYPE_ELEMENT
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const isLocalUrl = (href: string) => {
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try {
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const url = new URL(href)
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if (window.location.origin === url.origin) {
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if (url.pathname === window.location.pathname) {
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return !url.hash
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}
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return true
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}
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} catch (e) { }
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return false
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}
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const getOpts = ({ target }: Event): { url: URL; scroll?: boolean } | undefined => {
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if (!isElement(target)) return
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const a = target.closest("a")
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if (!a) return
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if ("routerIgnore" in a.dataset) return
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const { href } = a
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if (!isLocalUrl(href)) return
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return { url: new URL(href), scroll: "routerNoscroll" in a.dataset ? false : undefined }
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}
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function notifyNav(url: CanonicalSlug) {
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const event: CustomEventMap["nav"] = new CustomEvent("nav", { detail: { url } })
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document.dispatchEvent(event)
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}
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let p: DOMParser
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async function navigate(url: URL, isBack: boolean = false) {
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p = p || new DOMParser()
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const contents = await fetch(`${url}`)
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.then((res) => res.text())
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.catch(() => {
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window.location.assign(url)
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})
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if (!contents) return
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if (!isBack) {
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history.pushState({}, "", url)
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window.scrollTo({ top: 0 })
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}
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const html = p.parseFromString(contents, "text/html")
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let title = html.querySelector("title")?.textContent
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if (title) {
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document.title = title
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} else {
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const h1 = document.querySelector("h1")
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title = h1?.innerText ?? h1?.textContent ?? url.pathname
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}
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if (announcer.textContent !== title) {
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announcer.textContent = title
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}
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announcer.dataset.persist = ""
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html.body.appendChild(announcer)
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micromorph(document.body, html.body)
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// now, patch head
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const elementsToRemove = document.head.querySelectorAll(":not([spa-preserve])")
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elementsToRemove.forEach((el) => el.remove())
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const elementsToAdd = html.head.querySelectorAll(":not([spa-preserve])")
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elementsToAdd.forEach((el) => document.head.appendChild(el))
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notifyNav(getCanonicalSlug(window))
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delete announcer.dataset.persist
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}
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window.spaNavigate = navigate
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function createRouter() {
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if (typeof window !== "undefined") {
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window.addEventListener("click", async (event) => {
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const { url } = getOpts(event) ?? {}
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if (!url) return
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event.preventDefault()
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try {
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navigate(url, false)
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} catch (e) {
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window.location.assign(url)
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}
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})
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window.addEventListener("popstate", () => {
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if (window.location.hash) return
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try {
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navigate(new URL(window.location.toString()), true)
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} catch (e) {
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window.location.reload()
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}
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return
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})
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}
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return new (class Router {
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go(pathname: RelativeURL) {
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const url = new URL(pathname, window.location.toString())
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return navigate(url, false)
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}
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back() {
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return window.history.back()
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}
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forward() {
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return window.history.forward()
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}
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})()
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}
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createRouter()
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notifyNav(getCanonicalSlug(window))
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if (!customElements.get("route-announcer")) {
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const attrs = {
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"aria-live": "assertive",
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"aria-atomic": "true",
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style:
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"position: absolute; left: 0; top: 0; clip: rect(0 0 0 0); clip-path: inset(50%); overflow: hidden; white-space: nowrap; width: 1px; height: 1px",
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}
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customElements.define(
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"route-announcer",
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class RouteAnnouncer extends HTMLElement {
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constructor() {
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super()
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}
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connectedCallback() {
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for (const [key, value] of Object.entries(attrs)) {
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this.setAttribute(key, value)
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}
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}
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},
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)
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}
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