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export interface IPrettyRoute extends Route {
linkClick: (event: MouseEvent) => void;
}
export interface IPrettyRouteDynamicSegments {
[route: string]: string;
}
export interface IPrettyRouteQueries {
[field: string]: string;
}
const dynamicRoutes: IPrettyRouteDynamicSegments = {};
function decomposeDynamicRoute(route: string): {staticSegment: string, dynamicSegment: string } {
let pos = route.search(/[:\?]/);
if(pos === -1) {
pos = route.length;
} else Eif(route[pos] === ":") {
// Need to capture the "/"" before the ":". It must exist to be a well formed path element.
pos = pos - 1;
}
return {
dynamicSegment: route.substring(pos),
staticSegment: route.substring(0, pos),
};
}
export function addDynamicRoute(route: string): string {
const {staticSegment, dynamicSegment} = decomposeDynamicRoute(route);
// Just in case someone passes in a static route - ignore it.
if(dynamicSegment) {
dynamicRoutes[staticSegment] = dynamicSegment;
}
return staticSegment;
}
export function removeDynamicRoute(route: string): string | undefined {
const {staticSegment, dynamicSegment} = decomposeDynamicRoute(route);
const old = dynamicRoutes[staticSegment];
if(old) {
delete dynamicRoutes[staticSegment];
return staticSegment;
}
return undefined;
}
let prettyLinkQuerySeparator = "&";
export function setPrettyLinkQuerySeparator(newSeparator: string): string {
const old = prettyLinkQuerySeparator;
prettyLinkQuerySeparator = newSeparator;
return old;
}
// Handle automatically setting the pretty link onclick handler
// via the $prettylink directive
const prettyClickDirective: string = "$prettylink";
app.on("$", ({key, props}) => {
Eif (key === prettyClickDirective) {
if(typeof props[key] === "boolean") {
props.onclick = linkClick;
}
}
});
// A router function that handles "pretty links" (i.e. non hash based urls)
// dynamic segements, query strings, and html5 history.
function prettyLinkRouter(url: string, Epopstate: boolean = false): void {
// Adjust url in case there is a dynamic portion such as a query or
// dynamic segment.
const origUrl = url;
// Any queries?
const queries: IPrettyRouteQueries = {};
const queryPos = url.search(/\?/);
if(queryPos >= 0) {
const queryStr = url.substring(queryPos + 1);
const queryStrings = queryStr.split(prettyLinkQuerySeparator);
for(const query of queryStrings) {
const [field, value] = query.split("=");
queries[field] = value;
}
url = url.substring(0, queryPos);
}
// Any dynamic segements?
const dynamic: IPrettyRouteDynamicSegments = {};
const matchingDynamicRoute = Object.keys(dynamicRoutes).find((route) => {
return url.startsWith(route + "/");
});
if(matchingDynamicRoute) {
const urlDynamicParams = url.substring(matchingDynamicRoute.length).split("/");
const dynamicParams = dynamicRoutes[matchingDynamicRoute].split("/");
console.assert(dynamicParams.length === urlDynamicParams.length, `expected dynamic and actual dynamic length don't match ${dynamicParams.length} vs. ${urlDynamicParams.length}`);
// First param will always be a "", so ignore it.
for(let i = 1; i < dynamicParams.length; ++i) {
// Is this parameter in the dynamic section actually dynamic?
if(dynamicParams[i][0] === ":") {
dynamic[dynamicParams[i].substring(1)] = urlDynamicParams[i];
}
}
url = matchingDynamicRoute;
}
app.run(url, dynamic, queries) || app.run(ROUTER_404_EVENT, url, dynamic, queries);
app.run(ROUTER_EVENT, url, dynamic, queries);
Eif(!popstate) history.pushState({}, "", origUrl);
}
const prettyLinkRouterPopstateHandler = (_event: PopStateEvent) => {
// app.route cannot be undefined/null as it is assigned at the end of this module.
app.route!(location.href.replace(location.origin, ""), true);
};
document.addEventListener("DOMContentLoaded", () => {
window.onpopstate = prettyLinkRouterPopstateHandler;
prettyLinkRouter(location.href.replace(location.origin, ""));
});
// linkClick method to be used as an onclick event handler.
const linkClick = (event: MouseEvent) => {
event.preventDefault();
const currentTarget: HTMLBaseElement = event.currentTarget as HTMLBaseElement;
const href: string = currentTarget.href;
Iif(!href) console.error("linkClick invoked on target with no href!", event.currentTarget);
else app.run("route", href.replace(location.origin, ""));
};
prettyLinkRouter.linkClick = linkClick;
// selectors is a standard DOMString so you can select multiple selectors separated by
// commas to come up with any scheme to identify all your links.
export function addPrettyLinkHandlers(selectors: string): void {
document.querySelectorAll(selectors)
.forEach((link: Element) => {
(link as HTMLElement).onclick = linkClick;
});
}
// Overwrite AppRun's default router which only supports hash links.
app.route = prettyLinkRouter;
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