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routing.ts
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routing.ts
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import util from '../../shared/util.ts'
import type { RouterURL } from '../../types.ts'
import events from './events.ts'
import { toPagePath } from './module.ts'
const ghostRoute: Route = { path: '', module: { url: '' } }
export type Route = {
path: string
module: RouteModule
children?: Route[]
}
export type RouteModule = {
readonly url: string
readonly useDeno?: boolean
}
export type RoutingOptions = {
routes?: Route[]
rewrites?: Record<string, string>
baseURL?: string
defaultLocale?: string
locales?: string[]
}
export class Routing {
private _baseURL: string
private _defaultLocale: string
private _locales: string[]
private _routes: Route[]
private _rewrites: Record<string, string>
constructor({
baseURL = '/',
defaultLocale = 'en',
locales = [],
routes = [],
rewrites = {}
}: RoutingOptions) {
this._baseURL = baseURL
this._defaultLocale = defaultLocale
this._locales = locales
this._routes = routes
this._rewrites = rewrites
}
get baseURL() {
return this._baseURL
}
get paths() {
const paths: string[] = []
this._lookup(path => { paths.push(path.map(r => r.path).join('')) }, true)
return paths
}
// routes returns the routes as copy
get routes(): Route[] {
return JSON.parse(JSON.stringify(this._routes))
}
config(options: RoutingOptions) {
Object.keys(options).forEach((key) => {
Object.assign(this, { ['_' + key]: options[key as keyof typeof options] })
})
}
update(module: RouteModule) {
const newRoute: Route = { path: toPagePath(module.url), module: module }
const dirtyRoutes: Set<Route[]> = new Set()
let exists = false
let targetRoutes = this._routes
this._lookup(routePath => {
const path = routePath.map(r => r.path).join('')
const route = routePath[routePath.length - 1]
const parentRoute = routePath[routePath.length - 2]
if (route.module.url === module.url) {
Object.assign(route.module, module)
exists = true
return false
}
if (!newRoute.path.endsWith('/') && path.startsWith(newRoute.path + '/')) {
const routes = parentRoute ? parentRoute.children! : this._routes
const index = routes.indexOf(route)
if (index >= 0) {
routes.splice(index, 1, ghostRoute)
dirtyRoutes.add(routes)
}
(newRoute.children || (newRoute.children = [])).push({ ...route, path: util.trimPrefix(path, newRoute.path) })
} else if (!path.endsWith('/') && newRoute.path.startsWith(path + '/')) {
newRoute.path = util.trimPrefix(newRoute.path, path)
targetRoutes = route.children || (route.children = [])
}
})
if (exists) {
return
}
dirtyRoutes.forEach(routes => {
let index: number
while (~(index = routes.indexOf(ghostRoute))) {
routes.splice(index, 1)
}
})
dirtyRoutes.clear()
targetRoutes.push(newRoute)
}
removeRoute(url: string) {
this._lookup(path => {
const route = path[path.length - 1]
if (route.module.url === url) {
const parentRoute = path[path.length - 2]
const routes = parentRoute ? parentRoute.children! : this._routes
const index = routes.indexOf(route)
if (index >= 0) {
routes.splice(index, 1, ...(route.children || []).map(r => ({ ...r, path: route.path + r.path })))
}
return false
}
})
}
createRouter(location?: { pathname: string, search?: string }): [RouterURL, RouteModule[]] {
const loc = location || (window as any).location || { pathname: '/' }
const url = rewriteURL(loc.pathname + (loc.search || ''), this._baseURL, this._rewrites)
let locale = this._defaultLocale
let pathname = decodeURI(url.pathname)
let pagePath = ''
let params: Record<string, string> = {}
let nestedModules: RouteModule[] = []
if (pathname !== '/' && this._locales.length > 0) {
const a = pathname.split('/')
const a1 = a[1]
if (a1 !== locale && this._locales.includes(a1)) {
locale = a1
pathname = '/' + a.slice(2).join('/')
}
}
this._lookup(routePath => {
const path = routePath.map(r => r.path).join('')
const [p, ok] = matchPath(path, pathname)
if (ok) {
nestedModules = routePath.map(r => r.module)
const c = routePath[routePath.length - 1].children?.find(c => c.path === '/')
if (c) {
nestedModules.push(c.module)
}
pagePath = path
params = p
return false
}
}, true)
return [
{
baseURL: this._baseURL,
locale,
pathname,
pagePath,
params,
query: url.searchParams,
push: (url: string) => redirect(url),
replace: (url: string) => redirect(url, true),
},
nestedModules
]
}
lookup(callback: (path: Route[]) => Boolean | void) {
this._lookup(callback)
}
private _lookup(
callback: (path: Route[]) => Boolean | void,
skipNestedIndex = false,
__tracing: Route[] = [],
__routes = this._routes
) {
for (const route of __routes) {
if (skipNestedIndex && __tracing.length > 0 && route.path === '/') {
continue
}
if (callback([...__tracing, route]) === false) {
return false
}
}
for (const route of __routes) {
if (route.path !== '/' && route.children?.length) {
if (this._lookup(callback, skipNestedIndex, [...__tracing, route], route.children) === false) {
return false
}
}
}
}
}
function matchPath(routePath: string, locPath: string): [Record<string, string>, boolean] {
const params: Record<string, string> = {}
const routeSegments = util.splitPath(routePath)
const locSegments = util.splitPath(locPath)
const depth = Math.max(routeSegments.length, locSegments.length)
for (let i = 0; i < depth; i++) {
const routeSeg = routeSegments[i]
const locSeg = locSegments[i]
if (locSeg === undefined || routeSeg === undefined) {
return [{}, false]
}
if (routeSeg.startsWith('[...') && routeSeg.endsWith(']') && routeSeg.length > 5 && i === routeSegments.length - 1) {
params[routeSeg.slice(4, -1)] = locSegments.slice(i).map(decodeURIComponent).join('/')
break
}
if (routeSeg.startsWith('[') && routeSeg.endsWith(']') && routeSeg.length > 2) {
params[routeSeg.slice(1, -1)] = decodeURIComponent(locSeg)
} else if (routeSeg.startsWith('$') && routeSeg.length > 1) {
params[routeSeg.slice(1)] = decodeURIComponent(locSeg)
} else if (routeSeg !== locSeg) {
return [{}, false]
}
}
return [params, true]
}
export function createBlankRouterURL(baseURL = '/', locale = 'en'): RouterURL {
return {
baseURL,
locale,
pagePath: '',
pathname: '/',
params: {},
query: new URLSearchParams(),
push: () => void 0,
replace: () => void 0,
}
}
/** `rewriteURL` returns a rewrited URL */
export function rewriteURL(reqUrl: string, baseURL: string, rewrites: Record<string, string>): URL {
const url = new URL('http://localhost' + reqUrl)
if (baseURL !== '/') {
url.pathname = util.trimPrefix(decodeURI(url.pathname), baseURL)
}
for (const path in rewrites) {
const to = rewrites[path]
const [params, ok] = matchPath(path, decodeURI(url.pathname))
if (ok) {
const { searchParams } = url
url.href = 'http://localhost' + util.cleanPath(to.replace(/:(.+)(\/|&|$)/g, (s, k, e) => {
if (k in params) {
return params[k] + e
}
return s
}))
for (const [key, value] of url.searchParams.entries()) {
searchParams.append(key, value)
}
url.search = searchParams.toString()
break
}
}
return url
}
export async function redirect(url: string, replace?: boolean) {
const { location, history } = window as any
if (!util.isNEString(url)) {
return
}
if (util.isLikelyHttpURL(url) || url.startsWith('file://') || url.startsWith('mailto:')) {
location.href = url
return
}
url = util.cleanPath(url)
if (replace) {
history.replaceState(null, '', url)
} else {
history.pushState(null, '', url)
}
events.emit('popstate', { type: 'popstate', resetScroll: true })
}