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Rawter.ts
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Rawter.ts
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namespace Rawter
{
/** */
export function setup(rawReference?: Raw)
{
if (!rawReference)
{
if (typeof raw === "object")
rawReference = raw;
else
throw new Error("global raw object not found.");
}
rawLocal = rawReference!;
window.addEventListener("popstate", () =>
{
const normalize = (s: string) => "/" + s.split("/").filter(s => !!s).join("/") + "/";
const pathNormal = normalize(window.location.pathname);
const lastPathNormal = normalize(lastPath);
const isBacktracking =
pathNormal.length < lastPath.length &&
lastPathNormal.startsWith(pathNormal);
goInner(pathNormal, isBacktracking);
});
setInterval(() =>
{
lastPath = window.location.pathname;
},
100);
}
let lastPath = "";
let rawLocal: Raw;
/**
* Executes the specified routing function when the address bar changes
* to display the route specified.
*/
export function onset(
route: string,
fn: RawterFn): Raw.Param
{
return onInner(false, route, fn);
}
/**
* Executes the specified routing function when the address bar changes
* to display the route specified. This function also installs a click event handler
* on the container, which activates the specified route when the attached
* element is selected.
*/
export function on(
pattern: string,
fn: RawterFn): Raw.Param
{
return onInner(true, pattern, fn);
}
/**
*
*/
function onInner(
picked: boolean,
pattern: string,
whenFn: RawterFn): Raw.Param
{
if (!rawLocal)
Rawter.setup(new Raw(document));
if (!pattern.startsWith("/"))
pattern = "/" + pattern;
pattern = normalizeRoute(pattern);
return [
element => { routeRegistrations.push({ element, pattern, fn: whenFn }) },
picked && rawLocal.on("click", ev =>
{
ev.preventDefault();
go(pattern);
})
];
}
/** */
interface IRouteRegistration
{
readonly element: Element;
readonly pattern: string;
readonly fn: RawterFn;
handledRoute?: string;
}
const routeRegistrations: IRouteRegistration[] = [];
/**
* Force the browser window to render the routes for the specified path.
* If the path argument is omitted, the current path in the address bar is
* used.
*/
export function go(route = window.location.pathname)
{
const path = normalizeRoute(window.location.pathname);
const isBacktracking = routeStartsWith(route, path) && route.length < path.length;
history.pushState({}, "", route);
goInner(route, isBacktracking);
}
/** */
async function goInner(route: string, isBacktracking = false)
{
route = normalizeRoute(route);
const routes = route
.split("/")
.map((_, i, a) => "/" + a.slice(0, i + 1).filter(s => s).join("/"));
for (let i = routeRegistrations.length; i-- > 0;)
if (!routeRegistrations[i].element.isConnected)
routeRegistrations.splice(i, 1);
for (const currentRoute of routes)
{
for (const reg of routeRegistrations)
{
if (!matchRoute(reg.pattern, currentRoute))
continue;
if (reg.handledRoute === currentRoute)
if (!(isBacktracking && reg.handledRoute === route))
continue;
const fnResult = reg.fn(currentRoute);
if (fnResult || !reg.pattern.split("/").includes(any))
reg.handledRoute = currentRoute;
}
}
// Clean out the handledRoute properties, now that we're on a different route.
for (const rr of routeRegistrations)
if (rr.handledRoute)
if (!routeStartsWith(rr.handledRoute, route))
rr.handledRoute = undefined;
}
/**
*
*/
function routeStartsWith(routePrefix: string, route: string)
{
const prefixParts = splitRoute(routePrefix);
const routeParts = splitRoute(route);
if (prefixParts.length > routeParts.length)
return false;
for (let i = -1; ++i < prefixParts.length;)
if (prefixParts[i] !== routeParts[i])
return false;
return true;
}
/**
* Returns a boolean that indicatse whether the specified test route
* conforms to the specified pattern, taking into account wildcards (*).
* This function can be used to determine if /some/route/* is a match
* for /some/route/123.
*/
function matchRoute(patternRoute: string, testRoute: string)
{
if (patternRoute === testRoute)
return true;
const patternParts = splitRoute(patternRoute);
const testParts = splitRoute(testRoute);
if (patternParts.length !== testParts.length)
return false;
for (let i = -1; ++i < patternParts.length;)
{
const patternPart = patternParts[i];
const testPart = testParts[i];
if (patternPart === any)
continue;
if (patternPart !== testPart)
return false;
}
return true;
}
/** */
function splitRoute(s: string)
{
return s.split("/").filter(s => s);
}
/**
* Normalizes the specified route so that it is in the
* form: /route/is/here
*/
function normalizeRoute(route: string)
{
return route.split("/").filter(s => s).map(s => "/" + s).join("");
}
const any = "?";
/** */
export type RawterFn = (route: string) => any;
}
//@ts-ignore CommonJS compatibility
if (typeof module === "object") Object.assign(module.exports, { Rawter });
// ES module compatibility
declare module "rawter"
{
const __export: { Rawter: typeof Rawter };
export = __export;
}
// The comment and + prefix is removed during npm run bundle
//+ export { Rawter }