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import type { RouterParsedOptions, RouteState } from './types';
import { RouterMode } from './types';
type NavigationSubscribe = (url: string, state: RouteState) => void;
type NavigationGoResult = null | {
type: 'success';
url: string;
state: RouteState;
};
const PAGE_ID_KEY = '__pageId__';
export class Navigation {
public readonly options: RouterParsedOptions;
private readonly _history: History | MemoryHistory;
private readonly _unSubscribePopState: () => void;
private _promiseResolve:
| ((url?: string | null, state?: RouteState) => void)
| null = null;
public constructor(
options: RouterParsedOptions,
onUpdated?: NavigationSubscribe
) {
const history: History =
options.mode === RouterMode.history
? window.history
: new MemoryHistory();
const onPopStateChange: NavigationSubscribe = (url, state) => {
const dispatchEvent = this._promiseResolve || onUpdated;
dispatchEvent?.(url, state);
};
const subscribePopState =
history instanceof MemoryHistory
? history.onPopState(onPopStateChange)
: subscribeHtmlHistory(onPopStateChange);
this.options = options;
this._history = history;
this._unSubscribePopState = subscribePopState;
}
public get length(): number {
return this._history.length;
}
private _push(
history: History,
data: any,
url?: string | URL | null
): RouteState {
const state = {
...(data || {}),
[PAGE_ID_KEY]: PAGE_ID.next()
};
history.pushState(state, '', url);
return state;
}
private _replace(
history: History,
data: any,
url?: string | URL | null
): RouteState {
const oldId = history.state?.[PAGE_ID_KEY];
const state = {
...(data || {}),
[PAGE_ID_KEY]: typeof oldId === 'number' ? oldId : PAGE_ID.next()
};
history.replaceState(state, '', url);
return state;
}
public push(data: any, url?: string | URL | null): RouteState {
return this._push(this._history, data, url);
}
public replace(data: any, url?: string | URL | null): RouteState {
return this._replace(this._history, data, url);
}
public pushHistoryState(data: any, url?: string | URL | null) {
this._push(history, data, url);
}
public replaceHistoryState(data: any, url?: string | URL | null) {
this._replace(history, data, url);
}
public backHistoryState() {
return this._go(history, -1);
}
private _go(history: History, index: number): Promise<NavigationGoResult> {
if (this._promiseResolve) {
return Promise.resolve(null);
}
return new Promise<NavigationGoResult>((resolve) => {
this._promiseResolve = (url, state) => {
this._promiseResolve = null;
if (typeof url !== 'string') return resolve(null);
resolve({ type: 'success', url, state: state || {} });
};
setTimeout(this._promiseResolve, 80);
history.go(index);
});
}
public go(delta?: number): Promise<NavigationGoResult> {
return this._go(this._history, delta || 0);
}
public forward(): Promise<NavigationGoResult> {
return this.go(1);
}
public back(): Promise<NavigationGoResult> {
return this.go(-1);
}
public destroy() {
this._promiseResolve?.();
this._unSubscribePopState();
}
}
export class MemoryHistory implements History {
private _entries: Array<{ state: any; url: string }> = [];
private _index = -1;
private get _curEntry() {
const idx = this._index;
if (idx < 0 || idx >= this.length) return null;
return this._entries[idx];
}
private readonly _popStateCbs = new Set<NavigationSubscribe>();
public scrollRestoration: ScrollRestoration = 'auto';
// Return null when no current entry to align with browser history.state behavior
// Browser history.state can be null when no state was provided
public get state() {
return this._curEntry?.state ?? null;
}
public get url() {
return this._curEntry?.url ?? '';
}
constructor() {
this.pushState(null, '', '/');
}
public get length() {
return this._entries.length;
}
public pushState(
data: any,
unused: string,
url?: string | URL | null
): void {
// Remove all entries after the current position
this._entries.splice(this._index + 1);
this._entries.push({ state: data, url: url?.toString() ?? this.url });
this._index = this._entries.length - 1;
}
public replaceState(
data: any,
unused: string,
url?: string | URL | null
): void {
const curEntry = this._curEntry;
if (!curEntry) return;
curEntry.state = { ...data };
if (url) curEntry.url = url.toString();
}
public back(): void {
this.go(-1);
}
public forward(): void {
this.go(1);
}
public go(delta?: number): void {
if (!delta) return;
const newIdx = this._index + delta;
if (newIdx < 0 || newIdx >= this.length) return;
this._index = newIdx;
const entry = this._curEntry!;
// Simulate the async popstate event of html history as closely as possible
setTimeout(() => {
this._popStateCbs.forEach((cb) => cb(entry.url, entry.state));
});
}
public onPopState(cb: NavigationSubscribe) {
if (typeof cb !== 'function') return () => {};
this._popStateCbs.add(cb);
return () => this._popStateCbs.delete(cb);
}
}
function subscribeHtmlHistory(cb: NavigationSubscribe) {
// Use history.state || {} to handle null state from browser history
// Browser history.state can be null, but we normalize it to empty object
const wrapper = () => cb(location.href, history.state || {});
window.addEventListener('popstate', wrapper);
return () => window.removeEventListener('popstate', wrapper);
}
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