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# Logs
logs
*.log
# Dependency directory
# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
node_modules
# Remove some common IDE working directories
.idea
.vscode
# macOS
.DS_Store
# Packages
*.tgz
# Build artifacts
lib
module
docs/assets/hy-*

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GNU GENERAL PUBLIC LICENSE
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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

69
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{
"name": "@hydecorp/push-state",
"version": "1.0.0",
"description": "Turn static web sites into dynamic web apps",
"type": "module",
"main": "lib/index.js",
"module": "lib/index.js",
"files": [
"src",
"lib",
"module",
"tsconfig.json"
],
"publishConfig": {
"access": "public"
},
"scripts": {
"clean": "rm -rf lib module",
"test": "exit 0",
"build:tsc": "tsc -d",
"watch:tsc": "tsc -d -w",
"build:rollup": "rollup -c",
"watch:rollup": "rollup -c -w",
"build": "pnpm run build:tsc & pnpm run build:rollup & wait",
"watch": "pnpm run watch:tsc & pnpm run watch:rollup",
"serve": "serve -l 3337",
"dev": "pnpm run watch & pnpm run serve",
"preversion": "sed -i '' -E 's:^(lib|docs/assets/hy-\\*)$:#<removed temporarily>\\1:' .gitignore",
"version": "pnpm run build && git add .",
"postversion": "sed -i '' -E 's:^#<removed temporarily>(lib|docs/assets/hy-\\*)$:\\1:' .gitignore && git rm --cached -r lib docs/assets/hy-* && git add . && git commit -m 'Restore preversion .gitignore'",
"prepack": "pnpm run clean && pnpm run build"
},
"author": "Florian Klampfer <mail@qwtel.com> (https://qwtel.com/)",
"license": "GPL-3.0",
"dependencies": {
"@hydecorp/component": "^1.0.0",
"@types/resize-observer-browser": "^0.1.7"
},
"repository": {
"type": "git",
"url": "git+https://github.com/hydecorp/push-state.git"
},
"bugs": {
"url": "https://github.com/hydecorp/push-state/issues"
},
"homepage": "https://hydecorp.github.io/push-state/",
"keywords": [
"page-transitions",
"ajax",
"pjax",
"smoothstate",
"pivoine",
"vanilla",
"jquery",
"animations",
"rxjs",
"vanilla-js",
"custom-element",
"jquery-plugin",
"history-api",
"web-components",
"webcomponent",
"history-management",
"prefetch",
"page-loader",
"prefetcher",
"reactive"
]
}

23
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import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import typescript from "@rollup/plugin-typescript";
import terser from "@rollup/plugin-terser";
export default [
{
input: "src/index.ts",
output: [
{
file: `docs/assets/hy-push-state.js`,
format: "es",
sourcemap: true,
},
{
file: `module/index.js`,
format: "es",
sourcemap: true,
},
],
plugins: [typescript(), resolve(), commonjs(), terser()],
},
];

98
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export {
applyMixins,
subscribeWhen,
unsubscribeWhen,
filterWhen,
bufferDebounceTime,
fetchRx,
fragmentFromString,
createMutationObservable,
getScrollHeight,
getScrollLeft,
getScrollTop,
matches,
matchesAncestors,
} from "@hydecorp/component";
export enum Cause {
Init = "init",
Hint = "hint",
Push = "push",
Pop = "pop",
}
export interface Context {
cause: Cause;
url: URL;
oldURL?: URL;
cacheNr?: number;
replace?: boolean;
error?: any;
anchor?: HTMLAnchorElement;
}
export interface ClickContext extends Context {
event: MouseEvent;
}
export function isExternal(
url?: { protocol: string; host: string } | null,
location: { protocol: string; host: string } = window.location,
) {
return (
url != null &&
(url.protocol !== location.protocol || url.host !== location.host)
);
}
export function isHash(
{
hash,
origin,
pathname,
}: { hash: string; origin: string; pathname: string },
location: {
hash: string;
origin: string;
pathname: string;
} = window.location,
) {
return (
hash !== "" && origin === location.origin && pathname === location.pathname
);
}
export function shouldLoadAnchor(anchor?: HTMLAnchorElement | null) {
return anchor && anchor.target === "";
}
export function isPushEvent(
{ url, anchor, event: { metaKey, ctrlKey } }: ClickContext,
location: Location,
) {
return !!(
!metaKey &&
!ctrlKey &&
shouldLoadAnchor(anchor) &&
!isExternal(url, location)
);
}
export function isHintEvent({ url, anchor }: Context, location: Location) {
return !!(
shouldLoadAnchor(anchor) &&
!isExternal(url, location) &&
!isHash(url, location)
);
}
export function isHashChange({
cause,
url: { pathname, hash },
oldURL,
}: Context) {
return (
pathname === oldURL?.pathname &&
(cause === Cause.Pop || (cause === Cause.Push && hash !== ""))
);
}

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import { Subject, Observable, from, fromEvent, of, merge, NEVER } from "rxjs";
import {
matchesAncestors,
createMutationObservable,
subscribeWhen,
bufferDebounceTime,
} from "./common";
import {
map,
filter,
startWith,
tap,
mergeMap,
mergeAll,
switchMap,
} from "rxjs/operators";
const flat = <T>(x: Array<Array<T>>): Array<T> =>
Array.prototype.concat.apply([], x);
type MiniRecord = { addedNodes: Iterable<Node>; removedNodes: Iterable<Node> };
const combineRecords = (records: MiniRecord[]) => ({
addedNodes: new Set(flat(records.map((r) => Array.from(r.addedNodes)))),
removedNodes: new Set(flat(records.map((r) => Array.from(r.removedNodes)))),
});
export class EventListenersMixin {
el!: HTMLElement;
linkSelector!: string;
$!: {
linkSelector: Subject<string>;
prefetch: Subject<boolean>;
};
// LINKS 2
setupEventListeners() {
const pushEvent$ = fromEvent(this.el, "click").pipe(
map((event) => {
const anchor = matchesAncestors(
<Element>event.target,
this.linkSelector,
);
if (anchor instanceof HTMLAnchorElement) {
return [event, anchor] as [MouseEvent, HTMLAnchorElement];
}
}),
filter((x) => !!x),
);
const matchOrQuery = (
el: Element,
selector: string,
): Observable<HTMLAnchorElement> => {
if (el.matches(selector) && el instanceof HTMLAnchorElement) {
return of(el);
} else {
return from(el.querySelectorAll(selector)).pipe(
filter(
(el): el is HTMLAnchorElement => el instanceof HTMLAnchorElement,
),
);
}
};
const addEventListeners = (link: HTMLAnchorElement) => {
return merge(
fromEvent(link, "mouseenter", { passive: true }),
fromEvent(link, "touchstart", { passive: true }),
fromEvent(link, "focus", { passive: true }),
).pipe(map((event) => [event, link] as [Event, HTMLAnchorElement]));
};
const hintEvent$ = this.$.linkSelector.pipe(
switchMap((linkSelector) => {
const links = new Map<
HTMLAnchorElement,
Observable<[Event, HTMLAnchorElement]>
>();
const addLink = (link: HTMLAnchorElement) => {
if (!links.has(link)) {
links.set(link, addEventListeners(link));
}
};
const removeLink = (link: HTMLAnchorElement) => {
links.delete(link);
};
return createMutationObservable(this.el, {
childList: true,
subtree: true,
}).pipe(
startWith({ addedNodes: [this.el], removedNodes: [] }),
bufferDebounceTime(500),
map(combineRecords),
switchMap(({ addedNodes, removedNodes }) => {
from(removedNodes)
.pipe(
filter((el): el is Element => el instanceof Element),
mergeMap((el) => matchOrQuery(el, linkSelector)),
tap(removeLink),
)
.subscribe();
from(addedNodes)
.pipe(
filter((el): el is Element => el instanceof Element),
mergeMap((el) => matchOrQuery(el, linkSelector)),
tap(addLink),
)
.subscribe();
return from(links.values()).pipe(mergeAll());
}),
subscribeWhen(this.$.prefetch),
);
}),
);
return { hintEvent$, pushEvent$ };
}
}

68
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import { Context } from "./common";
import { ResponseContextErr } from "./fetch";
import { HyPushState } from "./index";
const timeout = (t: number) => new Promise((r) => setTimeout(r, t));
export class EventManager {
private parent: HyPushState;
constructor(parent: HyPushState) {
this.parent = parent;
}
onStart(context: Context) {
this.parent.animPromise = timeout(this.parent.duration);
const transitionUntil = (promise: Promise<{}>) => {
this.parent.animPromise = Promise.all([this.parent.animPromise, promise]);
};
this.parent.fireEvent("start", { detail: { ...context, transitionUntil } });
}
emitDOMError(error: any) {
if (process.env.DEBUG) console.error(error);
// To open the link directly, we first pop one entry off the browser history.
// We have to do this because some browsers (Safari) won't handle the back button correctly otherwise.
// We then wait for a short time and change the document's location.
// TODO: If we didn't call `pushState` optimistically we wouldn't have to do this.
// TODO: Use browser sniffing instead?
const url = location.href;
window.history.back();
setTimeout(() => document.location.assign(url), 100);
}
emitNetworkError(context: ResponseContextErr) {
if (process.env.DEBUG) console.error(context);
this.parent.fireEvent("networkerror", { detail: context });
}
emitError(context: Context) {
if (process.env.DEBUG) console.error(context);
this.parent.fireEvent("error", { detail: context });
}
emitReady(context: Context) {
this.parent.fireEvent("ready", { detail: context });
}
emitAfter(context: Context) {
this.parent.fadePromise = timeout(this.parent.duration);
const transitionUntil = (promise: Promise<{}>) => {
this.parent.fadePromise = Promise.all([this.parent.fadePromise, promise]);
};
this.parent.fireEvent("after", { detail: { ...context, transitionUntil } });
}
emitProgress(context: Context) {
this.parent.fireEvent("progress", { detail: context });
}
emitLoad(context: Context) {
this.parent.fireEvent("load", { detail: context });
}
}

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import { of, zip, Observable } from "rxjs";
import { catchError, map, take, switchMap } from "rxjs/operators";
import { fetchRx, Context } from "./common";
import { HyPushState } from "./index";
export interface ResponseContext extends Context {
responseText: string | null;
error?: any;
}
export interface ResponseContextOk extends ResponseContext {
responseText: string;
}
export interface ResponseContextErr extends ResponseContext {
responseText: null;
error: any;
}
export class FetchManager {
private parent: HyPushState;
constructor(parent: HyPushState) {
this.parent = parent;
}
fetchPage(context: Context): Observable<ResponseContext> {
return fetchRx(context.url.href, {
method: "GET",
mode: "cors", ///isExternal(this.parent) ? 'cors' : undefined,
headers: { Accept: "text/html" },
}).pipe(
switchMap((response) => response.text()),
map((responseText) => ({ ...context, responseText })),
catchError((error) => of({ ...context, error, responseText: null })),
);
}
private selectPrefetch(
{ href }: URL,
latestPrefetch: ResponseContext,
prefetch$: Observable<ResponseContext>,
) {
return href === latestPrefetch.url.href // && latestPrefetch.error == null
? of(latestPrefetch)
: prefetch$.pipe(take(1));
}
// Returns an observable that emits exactly one notice, which contains the response.
// It will not emit until an (optional) page transition animation completes.
getResponse(
prefetch$: Observable<ResponseContext>,
context: Context,
latestPrefetch: ResponseContext,
) {
return zip(
this.selectPrefetch(context.url, latestPrefetch, prefetch$),
this.parent.animPromise,
).pipe(
map(([prefetch]) => ({ ...prefetch, ...context }) as ResponseContext),
);
}
}

96
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import {
isExternal,
getScrollTop,
getScrollHeight,
Cause,
Context,
} from "./common";
import { ReplaceContext } from "./update";
// @ts-ignore
window.HashChangeEvent =
window.HashChangeEvent ||
function HashChangeEvent(type, { oldURL = "", newURL = "" } = {}) {
const e = new CustomEvent(type);
// @ts-ignore
e.oldURL = oldURL;
// @ts-ignore
e.newURL = newURL;
return e;
};
function simHashChange(newURL: URL, oldURL: URL) {
if (newURL.hash !== oldURL.hash) {
window.dispatchEvent(
new HashChangeEvent("hashchange", {
newURL: newURL.href,
oldURL: oldURL.href,
}),
);
}
}
export class HistoryManager {
private parent: Location & { histId: string; simulateHashChange: boolean };
constructor(
parent: Location & { histId: string; simulateHashChange: boolean },
) {
this.parent = parent;
}
updateHistoryState({ cause, replace, url, oldURL }: Context) {
if (isExternal(this.parent)) return;
switch (cause) {
case Cause.Init:
case Cause.Push: {
const { histId } = this.parent;
if (replace || url.href === location.href) {
const state = { ...history.state, [histId]: {} };
history.replaceState(state, document.title, url.href);
} else {
history.pushState({ [histId]: {} }, document.title, url.href);
}
// no break
}
case Cause.Pop: {
if (this.parent.simulateHashChange && oldURL)
simHashChange(url, oldURL);
break;
}
default: {
// if (process.env.DEBUG) console.warn(`Type '${cause}' not reconginzed`);
break;
}
}
}
updateTitle({ cause, title }: ReplaceContext) {
document.title = title;
if (!isExternal(this.parent) && cause === Cause.Push) {
history.replaceState(history.state, title);
}
}
updateHistoryScrollPosition = () => {
if (isExternal(this.parent)) return;
const state = this.assignScrollPosition(history.state || {});
history.replaceState(state, document.title);
};
private assignScrollPosition(state: any) {
const { histId } = this.parent;
return {
...state,
[histId]: {
...state[histId],
scrollTop: getScrollTop(),
scrollHeight: getScrollHeight(),
},
};
}
}

440
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/**
* Copyright (c) 2020 Florian Klampfer <https://qwtel.com/>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @license
* @nocompile
*/
import { property, customElement } from "lit/decorators.js";
import {
Observable,
Subject,
BehaviorSubject,
merge,
defer,
fromEvent,
animationFrameScheduler,
} from "rxjs";
import {
map,
filter,
tap,
takeUntil,
startWith,
pairwise,
share,
mapTo,
switchMap,
distinctUntilChanged,
withLatestFrom,
catchError,
observeOn,
} from "rxjs/operators";
import {
RxLitElement,
createResolvablePromise,
matchesAncestors,
} from "@hydecorp/component";
import {
applyMixins,
Context,
Cause,
ClickContext,
isPushEvent,
isHashChange,
isHintEvent,
filterWhen,
isExternal,
} from "./common";
import {
FetchManager,
ResponseContext,
ResponseContextErr,
ResponseContextOk,
} from "./fetch";
import { UpdateManager } from "./update";
import { EventListenersMixin } from "./event-listeners";
import { EventManager } from "./event";
import { HistoryManager } from "./history";
import { ScrollManager } from "./scroll";
function compareContext(p: Context, q: Context) {
return (
p.url.href === q.url.href && p.error === q.error && p.cacheNr === q.cacheNr
);
}
@customElement("hy-push-state")
export class HyPushState
extends applyMixins(RxLitElement, [EventListenersMixin])
implements Location, EventListenersMixin
{
el: HTMLElement = this;
createRenderRoot() {
return this;
}
@property({ type: String, reflect: true, attribute: "replace-selector" })
replaceSelector?: string;
@property({ type: String, reflect: true, attribute: "link-selector" })
linkSelector: string = "a[href]:not([data-no-push])";
@property({ type: String, reflect: true, attribute: "script-selector" })
scriptSelector?: string;
@property({ type: Boolean, reflect: true }) prefetch: boolean = false;
@property({ type: Number, reflect: true }) duration: number = 0;
// @property({ type: Boolean, reflect: true, attribute: 'simulate-load' }) simulateLoad: boolean = false;
@property({ type: Boolean, reflect: true, attribute: "hashchange" })
simulateHashChange: boolean = false;
@property({ type: String }) baseURL: string = window.location.href;
#initialized = createResolvablePromise();
get initialized() {
return this.#initialized;
}
$!: {
linkSelector: Subject<string>;
prefetch: Subject<boolean>;
};
animPromise: Promise<any> = Promise.resolve(null);
fadePromise: Promise<any> = Promise.resolve(null);
#scrollManager = new ScrollManager(this);
#historyManager = new HistoryManager(this);
#fetchManager = new FetchManager(this);
#updateManager = new UpdateManager(this);
#eventManager = new EventManager(this);
#url = new URL(this.baseURL);
#setLocation = (
key:
| "hash"
| "host"
| "hostname"
| "href"
| "pathname"
| "port"
| "protocol"
| "search",
value: string,
) => {
const u = new URL(this.#url.href);
u[key] = value;
this.assign(u.href);
};
// Implement Location
get hash() {
return this.#url.hash;
}
get host() {
return this.#url.host;
}
get hostname() {
return this.#url.hostname;
}
get href() {
return this.#url.href;
}
get pathname() {
return this.#url.pathname;
}
get port() {
return this.#url.port;
}
get protocol() {
return this.#url.protocol;
}
get search() {
return this.#url.search;
}
get origin() {
return this.#url.origin;
}
get ancestorOrigins() {
return window.location.ancestorOrigins;
}
set hash(value) {
this.#setLocation("hash", value);
}
set host(value) {
this.#setLocation("host", value);
}
set hostname(value) {
this.#setLocation("hostname", value);
}
set href(value) {
this.#setLocation("href", value);
}
set pathname(value) {
this.#setLocation("pathname", value);
}
set port(value) {
this.#setLocation("port", value);
}
set protocol(value) {
this.#setLocation("protocol", value);
}
set search(value) {
this.#setLocation("search", value);
}
// EventListenersMixin
setupEventListeners!: () => {
pushEvent$: Observable<[MouseEvent, HTMLAnchorElement]>;
hintEvent$: Observable<[Event, HTMLAnchorElement]>;
};
#cacheNr = 0;
get histId() {
return this.id || this.tagName;
}
#reload$ = new Subject<Context>();
@property()
assign(url: string) {
this.#reload$.next({
cause: Cause.Push,
url: new URL(url, this.href),
cacheNr: ++this.#cacheNr,
});
}
@property()
reload() {
this.#reload$.next({
cause: Cause.Push,
url: new URL(this.href),
cacheNr: ++this.#cacheNr,
replace: true,
});
}
@property()
replace(url: string) {
this.#reload$.next({
cause: Cause.Push,
url: new URL(url, this.href),
cacheNr: ++this.#cacheNr,
replace: true,
});
}
connectedCallback() {
super.connectedCallback();
this.$ = {
linkSelector: new BehaviorSubject(this.linkSelector),
prefetch: new BehaviorSubject(this.prefetch),
};
// Remember the current scroll position (for F5/reloads).
window.addEventListener(
"beforeunload",
this.#historyManager.updateHistoryScrollPosition,
);
// Remember scroll position for backward/forward navigation cache.
// Technically, this is only necessary for Safari, because other browsers will not use the BFN cache
// when a beforeunload event is registered...
document.documentElement.addEventListener(
"click",
this.#updateHistoryScrollPosition,
);
this.updateComplete.then(this.#upgrade);
}
#updateHistoryScrollPosition = (event: MouseEvent) => {
const anchor = matchesAncestors(
event.target as Element,
"a[href]",
) as HTMLAnchorElement | null;
if (isExternal(anchor)) {
this.#historyManager.updateHistoryScrollPosition();
}
};
#response$!: Observable<ResponseContext>;
#upgrade = () => {
const { pushEvent$, hintEvent$ } = this.setupEventListeners();
const push$: Observable<ClickContext> = pushEvent$.pipe(
// takeUntil(this.subjects.disconnect),
map(([event, anchor]) => ({
cause: Cause.Push,
url: new URL(anchor.href, this.href),
anchor,
event,
cacheNr: this.#cacheNr,
})),
filter((x) => isPushEvent(x, this)),
tap(({ event }) => {
event.preventDefault();
this.#historyManager.updateHistoryScrollPosition();
}),
);
const pop$: Observable<Context> = fromEvent(window, "popstate").pipe(
// takeUntil(this.subjects.disconnect),
filter(() => window.history.state && window.history.state[this.histId]),
map((event) => ({
cause: Cause.Pop,
url: new URL(window.location.href),
cacheNr: this.#cacheNr,
event,
})),
);
const reload$ = this.#reload$; // .pipe(takeUntil(this.subjects.disconnect));
const merged$: Observable<Context> = merge(push$, pop$, reload$).pipe(
startWith({ url: new URL(window.location.href) } as Context),
pairwise(),
map(([old, current]) => Object.assign(current, { oldURL: old.url })),
share(),
);
const page$ = merged$.pipe(
filter((p) => !isHashChange(p)),
share(),
);
const hash$ = merged$.pipe(
filter((p) => isHashChange(p)),
filter(() => history.state && history.state[this.histId]),
observeOn<Context>(animationFrameScheduler),
tap((context) => {
this.#historyManager.updateHistoryState(context);
this.#scrollManager.manageScrollPosition(context);
}),
);
const pauser$ = defer(() =>
merge(page$.pipe(mapTo(true)), this.#response$.pipe(mapTo(false))),
).pipe(startWith(false));
const hint$: Observable<Context> = hintEvent$.pipe(
// takeUntil(this.subjects.disconnect),
filterWhen(pauser$.pipe(map((x) => !x))),
map(([event, anchor]) => ({
cause: Cause.Hint,
url: new URL(anchor.href, this.href),
anchor,
event,
cacheNr: this.#cacheNr,
})),
filter((x) => isHintEvent(x, this)),
);
const prefetchResponse$ = merge(hint$, page$).pipe(
distinctUntilChanged((x, y) => compareContext(x, y)),
switchMap((x) => this.#fetchManager.fetchPage(x)),
startWith({ url: {} } as ResponseContext),
share(),
);
const response$ = (this.#response$ = page$.pipe(
tap((context) => {
this.#eventManager.onStart(context);
this.#historyManager.updateHistoryState(context);
this.#url = context.url;
}),
withLatestFrom(prefetchResponse$),
switchMap((args) =>
this.#fetchManager.getResponse(prefetchResponse$, ...args),
),
share(),
));
const responseOk$ = response$.pipe(
filter((ctx): ctx is ResponseContextOk => !ctx.error),
);
const responseErr$ = response$.pipe(
filter((ctx): ctx is ResponseContextErr => !!ctx.error),
);
const main$ = responseOk$.pipe(
map((context) => this.#updateManager.responseToContent(context)),
tap((context) => this.#eventManager.emitReady(context)),
observeOn(animationFrameScheduler),
tap((context) => {
this.#updateManager.updateDOM(context);
this.#historyManager.updateTitle(context);
this.#eventManager.emitAfter(context);
}),
startWith({
cause: Cause.Init,
url: this.#url,
scripts: [],
}),
observeOn(animationFrameScheduler),
tap((context) => this.#scrollManager.manageScrollPosition(context)),
tap({ error: (e) => this.#eventManager.emitDOMError(e) }),
catchError((_, c) => c),
switchMap((x) => this.fadePromise.then(() => x)),
switchMap((x) => this.#updateManager.reinsertScriptTags(x)),
tap({ error: (e) => this.#eventManager.emitError(e) }),
catchError((_, c) => c),
tap((context) => this.#eventManager.emitLoad(context)),
);
const error$ = responseErr$.pipe(
tap((e) => this.#eventManager.emitNetworkError(e)),
);
const progress$ = page$.pipe(
switchMap((context) =>
defer(() => this.animPromise).pipe(
takeUntil(response$),
mapTo(context),
),
),
tap((context) => this.#eventManager.emitProgress(context)),
);
// Subscriptions
main$.subscribe();
hash$.subscribe();
error$.subscribe();
progress$.subscribe();
this.#initialized.resolve(this);
this.fireEvent("init");
};
disconnectedCallback() {
window.removeEventListener(
"beforeunload",
this.#historyManager.updateHistoryScrollPosition,
);
document.documentElement.removeEventListener(
"click",
this.#updateHistoryScrollPosition,
);
}
}

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// When fetching documents from an external source,
// relative URLs will be resolved relative to the current `window.location`.
// We can rewrite URL to absolute urls
export function rewriteURLs(replaceEls: (Element | null)[], base: string) {
replaceEls.forEach((el) => {
if (!el) return;
el.querySelectorAll("[href]").forEach(rewriteURL("href", base));
el.querySelectorAll("[src]").forEach(rewriteURL("src", base));
el.querySelectorAll("img[srcset]").forEach(
rewriteURLSrcSet("srcset", base),
);
el.querySelectorAll("blockquote[cite]").forEach(rewriteURL("cite", base));
el.querySelectorAll("del[cite]").forEach(rewriteURL("cite", base));
el.querySelectorAll("ins[cite]").forEach(rewriteURL("cite", base));
el.querySelectorAll("q[cite]").forEach(rewriteURL("cite", base));
el.querySelectorAll("img[longdesc]").forEach(rewriteURL("longdesc", base));
el.querySelectorAll("frame[longdesc]").forEach(
rewriteURL("longdesc", base),
);
el.querySelectorAll("iframe[longdesc]").forEach(
rewriteURL("longdesc", base),
);
el.querySelectorAll("img[usemap]").forEach(rewriteURL("usemap", base));
el.querySelectorAll("input[usemap]").forEach(rewriteURL("usemap", base));
el.querySelectorAll("object[usemap]").forEach(rewriteURL("usemap", base));
el.querySelectorAll("form[action]").forEach(rewriteURL("action", base));
el.querySelectorAll("button[formaction]").forEach(
rewriteURL("formaction", base),
);
el.querySelectorAll("input[formaction]").forEach(
rewriteURL("formaction", base),
);
el.querySelectorAll("video[poster]").forEach(rewriteURL("poster", base));
el.querySelectorAll("object[data]").forEach(rewriteURL("data", base));
el.querySelectorAll("object[codebase]").forEach(
rewriteURL("codebase", base),
);
el.querySelectorAll("object[archive]").forEach(
rewriteURLList("archive", base),
);
/* el.querySelectorAll("command[icon]").forEach(this.rewriteURL("icon")); */ // obsolte
});
}
function rewriteURL(attr: string, base: string) {
return (el: Element) => {
try {
const attrVal = el.getAttribute(attr);
if (attrVal == null) return;
el.setAttribute(attr, new URL(attrVal, base).href);
} catch (e) {
// if (process.env.DEBUG) console.warn(`Couldn't rewrite URL in attribute ${attr} on element`, el);
}
};
}
function rewriteURLSrcSet(attr: string, base: string) {
return (el: Element) => {
try {
const attrVal = el.getAttribute(attr);
if (attrVal == null) return;
el.setAttribute(
attr,
attrVal
.split(/\s*,\s*/)
.map((str) => {
const pair = str.split(/\s+/);
pair[0] = new URL(pair[0], base).href;
return pair.join(" ");
})
.join(", "),
);
} catch (e) {
// if (process.env.DEBUG) console.warn(`Couldn't rewrite URLs in attribute ${attr} on element`, el);
}
};
}
function rewriteURLList(attr: string, base: string) {
return (el: Element) => {
try {
const attrVal = el.getAttribute(attr);
if (attrVal == null) return;
el.setAttribute(
attr,
attrVal
.split(/[\s,]+/)
.map((str) => new URL(str, base).href)
.join(", "),
);
} catch (e) {
// if (process.env.DEBUG) console.warn(`Couldn't rewrite URLs in attribute ${attr} on element`, el);
}
};
}

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import { of, from } from "rxjs";
import { concatMap, catchError, finalize, mapTo } from "rxjs/operators";
import { HyPushState } from ".";
function cloneScript(script: HTMLScriptElement) {
const newScript = document.createElement("script");
Array.from(script.attributes).forEach((attr) =>
newScript.setAttributeNode(attr.cloneNode() as Attr),
);
newScript.innerHTML = script.innerHTML;
return newScript;
}
export class ScriptManager {
private parent: HyPushState;
constructor(parent: HyPushState) {
this.parent = parent;
}
get scriptSelector() {
return this.parent.scriptSelector;
}
removeScriptTags(replaceEls: (Element | null)[]) {
const scripts: Array<[HTMLScriptElement, HTMLScriptElement]> = [];
replaceEls.forEach((el) => {
if (el && this.scriptSelector) {
el.querySelectorAll(this.scriptSelector).forEach((script) => {
if (script instanceof HTMLScriptElement) {
const newScript = cloneScript(script);
const pair: [HTMLScriptElement, HTMLScriptElement] = [
newScript,
script,
];
scripts.push(pair);
}
});
}
});
return scripts;
}
reinsertScriptTags(context: {
scripts: Array<[HTMLScriptElement, HTMLScriptElement]>;
}) {
if (!this.scriptSelector) return Promise.resolve(context);
const { scripts } = context;
const originalWrite = document.write;
return from(scripts)
.pipe(
concatMap((script) => this.insertScript(script)),
catchError((error) => of({ ...context, error })),
finalize(() => (document.write = originalWrite)),
mapTo(context),
)
.toPromise();
}
private insertScript([script, ref]: [
HTMLScriptElement,
HTMLScriptElement,
]): Promise<{}> {
document.write = (...args) => {
const temp = document.createElement("div");
temp.innerHTML = args.join();
Array.from(temp.childNodes).forEach((node) =>
ref.parentNode?.insertBefore(node, ref),
);
};
return new Promise((resolve, reject) => {
if (script.src !== "") {
script.addEventListener("load", resolve);
script.addEventListener("error", reject);
ref.parentNode?.replaceChild(script, ref);
} else {
ref.parentNode?.replaceChild(script, ref);
resolve({});
}
});
}
}

78
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import { getScrollTop, Cause } from "./common";
interface ScrollState {
[k: string]: any;
scrollTop?: number;
scrollHeight?: number;
}
export class ScrollManager {
private parent: { histId: string } & HTMLElement;
constructor(parent: { histId: string } & HTMLElement) {
this.parent = parent;
if ("scrollRestoration" in history) {
history.scrollRestoration = "manual";
}
}
manageScrollPosition({ cause, url: { hash } }: { cause: Cause; url: URL }) {
switch (cause) {
case Cause.Push: {
// FIXME: make configurable
this.scrollHashIntoView(hash, {
behavior: "smooth",
block: "start",
inline: "nearest",
});
break;
}
case Cause.Pop: {
this.restoreScrollPosition();
break;
}
case Cause.Init: {
this.restoreScrollPositionOnReload();
break;
}
}
}
private elementFromHash(hash: string) {
return document.getElementById(decodeURIComponent(hash.substr(1)));
}
private scrollHashIntoView(
hash: string,
options: boolean | ScrollIntoViewOptions,
) {
if (hash) {
const el = this.elementFromHash(hash);
if (el) el.scrollIntoView(options);
} else {
window.scroll(window.pageXOffset, 0);
}
}
private restoreScrollPosition() {
const { histId } = this.parent;
const { scrollTop } =
(history.state && history.state[histId]) || ({} as ScrollState);
if (scrollTop != null) {
window.scroll(window.pageXOffset, scrollTop);
}
}
private restoreScrollPositionOnReload() {
const { histId } = this.parent;
const scrollState = history.state && history.state[histId];
// FIXME: As far as I can tell there is no better way of figuring out if the user has scrolled
// and it doesn't work on hash links b/c the scroll position is going to be non-null by definition
if (scrollState && getScrollTop() === 0) {
this.restoreScrollPosition();
} else if (location.hash) {
requestAnimationFrame(() => this.scrollHashIntoView(location.hash, true));
}
}
}

135
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import { isExternal, fragmentFromString } from "./common";
import { ScriptManager } from "./script";
import { rewriteURLs } from "./rewrite-urls";
import { ResponseContext, ResponseContextOk } from "./fetch";
import { HyPushState } from ".";
const CANONICAL_SEL = "link[rel=canonical]";
const META_DESC_SEL = "meta[name=description]";
export interface ReplaceContext extends ResponseContext {
title: string;
document: Document;
replaceEls: (Element | null)[];
scripts: Array<[HTMLScriptElement, HTMLScriptElement]>;
}
export class UpdateManager {
private parent!: HyPushState;
private scriptManager!: ScriptManager;
constructor(parent: HyPushState) {
this.parent = parent;
this.scriptManager = new ScriptManager(parent);
}
get el() {
return this.parent;
}
get replaceSelector() {
return this.parent.replaceSelector;
}
get scriptSelector() {
return this.parent.scriptSelector;
}
// Extracts the elements to be replaced
private getReplaceElements(doc: Document): (Element | null)[] {
if (this.replaceSelector) {
return this.replaceSelector
.split(",")
.map((sel) => doc.querySelector(sel));
} else if (this.el.id) {
return [doc.getElementById(this.el.id)];
} else {
const index = Array.from(
document.getElementsByTagName(this.el.tagName),
).indexOf(this.el);
return [doc.getElementsByTagName(this.el.tagName)[index]];
}
}
// Takes the response string and turns it into document fragments
// that can be inserted into the DOM.
responseToContent(context: ResponseContextOk): ReplaceContext {
const { responseText } = context;
const doc = new DOMParser().parseFromString(responseText, "text/html");
const { title = "" } = doc;
const replaceEls = this.getReplaceElements(doc);
if (replaceEls.every((el) => el == null)) {
throw new Error(
`Couldn't find any element in the document at '${location}'.`,
);
}
const scripts = this.scriptSelector
? this.scriptManager.removeScriptTags(replaceEls)
: [];
return { ...context, document: doc, title, replaceEls, scripts };
}
// Replaces the old elements with the new one, one-by-one.
private replaceContentWithSelector(
replaceSelector: string,
elements: (Element | null)[],
) {
replaceSelector
.split(",")
.map((sel) => document.querySelector(sel))
.forEach((oldElement, i) => {
const el = elements[i];
if (el) oldElement?.parentNode?.replaceChild(el, oldElement);
});
}
// When no `replaceIds` are set, replace the entire content of the component (slow).
private replaceContentWholesale([el]: (Element | null)[]) {
if (el) this.el.innerHTML = el.innerHTML;
}
private replaceContent(replaceEls: (Element | null)[]) {
if (this.replaceSelector) {
this.replaceContentWithSelector(this.replaceSelector, replaceEls);
} else {
this.replaceContentWholesale(replaceEls);
}
}
private replaceHead(doc: Document) {
const { head } = this.el.ownerDocument;
const canonicalEl = head.querySelector(
CANONICAL_SEL,
) as HTMLLinkElement | null;
const cEl = doc.head.querySelector(CANONICAL_SEL) as HTMLLinkElement | null;
if (canonicalEl && cEl) canonicalEl.href = cEl.href;
const metaDescEl = head.querySelector(
META_DESC_SEL,
) as HTMLMetaElement | null;
const mEl = doc.head.querySelector(META_DESC_SEL) as HTMLMetaElement | null;
if (metaDescEl && mEl) metaDescEl.content = mEl.content;
}
updateDOM(context: ReplaceContext) {
try {
const { replaceEls, document } = context;
if (isExternal(this.parent)) rewriteURLs(replaceEls, this.parent.href);
this.replaceHead(document);
this.replaceContent(replaceEls);
} catch (error) {
throw { ...context, error };
}
}
reinsertScriptTags(context: {
scripts: Array<[HTMLScriptElement, HTMLScriptElement]>;
}) {
return this.scriptManager.reinsertScriptTags(context);
}
}

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{
"compilerOptions": {
"experimentalDecorators": true,
"lib": ["DOM", "DOM.Iterable", "ES2020"],
"moduleResolution": "Node",
"module": "ES2020",
"target": "ES2018",
"outDir": "lib",
"declaration": true,
"declarationMap": true,
"sourceMap": true,
"inlineSources": true,
"strict": true,
"importHelpers": true
},
"include": ["typings/**/*.ts", "src/**/*.ts"]
}

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type Constructor<T> = {
new (...args: unknown[]): T;
};
// From the TC39 Decorators proposal
interface ClassDescriptor {
kind: "class";
elements: ClassElement[];
finisher?: <T>(clazz: Constructor<T>) => undefined | Constructor<T>;
}
// From the TC39 Decorators proposal
interface ClassElement {
kind: "field" | "method";
key: PropertyKey;
placement: "static" | "prototype" | "own";
initializer?: Function;
extras?: ClassElement[];
finisher?: <T>(clazz: Constructor<T>) => undefined | Constructor<T>;
descriptor?: PropertyDescriptor;
}