90 lines
2.2 KiB
TypeScript
90 lines
2.2 KiB
TypeScript
import { safeRun } from "../common/util";
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function encodePageUrl(name: string): string {
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return name.replaceAll(" ", "_");
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}
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function decodePageUrl(url: string): string {
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return url.replaceAll("_", " ");
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}
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export class PathPageNavigator {
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navigationResolve?: () => void;
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constructor(readonly indexPage: string, readonly root: string = "") {}
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async navigate(page: string, pos?: number, replaceState = false) {
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let encodedPage = encodePageUrl(page);
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if (page === this.indexPage) {
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encodedPage = "";
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}
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if (replaceState) {
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window.history.replaceState(
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{ page, pos },
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page,
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`${this.root}/${encodedPage}`
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);
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} else {
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window.history.pushState(
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{ page, pos },
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page,
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`${this.root}/${encodedPage}`
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);
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}
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window.dispatchEvent(
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new PopStateEvent("popstate", {
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state: { page, pos },
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})
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);
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await new Promise<void>((resolve) => {
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this.navigationResolve = resolve;
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});
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this.navigationResolve = undefined;
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}
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subscribe(
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pageLoadCallback: (pageName: string, pos: number) => Promise<void>
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): void {
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const cb = (event?: PopStateEvent) => {
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const gotoPage = this.getCurrentPage();
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if (!gotoPage) {
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return;
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}
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safeRun(async () => {
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await pageLoadCallback(
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this.getCurrentPage(),
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event?.state && event.state.pos
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);
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if (this.navigationResolve) {
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this.navigationResolve();
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}
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});
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};
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window.addEventListener("popstate", cb);
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cb();
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}
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decodeURI(): [string, number] {
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let parts = decodeURI(
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location.pathname.substring(this.root.length + 1)
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).split("@");
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let page =
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parts.length > 1 ? parts.slice(0, parts.length - 1).join("@") : parts[0];
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let pos = parts.length > 1 ? parts[parts.length - 1] : "0";
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if (pos.match(/^\d+$/)) {
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return [page, +pos];
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} else {
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return [`${page}@${pos}`, 0];
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}
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}
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getCurrentPage(): string {
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return decodePageUrl(this.decodeURI()[0]) || this.indexPage;
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}
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getCurrentPos(): number {
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// console.log("Pos", this.decodeURI()[1]);
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return this.decodeURI()[1];
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}
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}
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