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221 lines (190 loc) · 7.32 KB
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* This is a private API for the ngtools toolkit.
*
* This API should be stable for NG 2. It can be removed in NG 4..., but should be replaced by
* something else.
*/
import {AotCompilerHost, StaticReflector, StaticSymbol} from '@angular/compiler';
import {NgModule} from '@angular/core';
// We cannot depend directly to @angular/router.
type Route = any;
const ROUTER_MODULE_PATH = '@angular/router';
const ROUTER_ROUTES_SYMBOL_NAME = 'ROUTES';
// LazyRoute information between the extractors.
export interface LazyRoute {
routeDef: RouteDef;
absoluteFilePath: string;
}
export type LazyRouteMap = {
[route: string]: LazyRoute
};
// A route definition. Normally the short form 'path/to/module#ModuleClassName' is used by
// the user, and this is a helper class to extract information from it.
export class RouteDef {
private constructor(public readonly path: string, public readonly className: string|null = null) {
}
toString() {
return (this.className === null || this.className == 'default') ?
this.path :
`${this.path}#${this.className}`;
}
static fromString(entry: string): RouteDef {
const split = entry.split('#');
return new RouteDef(split[0], split[1] || null);
}
}
/**
*
* @returns {LazyRouteMap}
* @private
*/
export function listLazyRoutesOfModule(
entryModule: string, host: AotCompilerHost, reflector: StaticReflector): LazyRouteMap {
const entryRouteDef = RouteDef.fromString(entryModule);
const containingFile = _resolveModule(entryRouteDef.path, entryRouteDef.path, host);
const modulePath = `./${containingFile.replace(/^(.*)\//, '')}`;
const className = entryRouteDef.className !;
// List loadChildren of this single module.
const appStaticSymbol = reflector.findDeclaration(modulePath, className, containingFile);
const ROUTES = reflector.findDeclaration(ROUTER_MODULE_PATH, ROUTER_ROUTES_SYMBOL_NAME);
const lazyRoutes: LazyRoute[] =
_extractLazyRoutesFromStaticModule(appStaticSymbol, reflector, host, ROUTES);
const allLazyRoutes = lazyRoutes.reduce(
function includeLazyRouteAndSubRoutes(allRoutes: LazyRouteMap, lazyRoute: LazyRoute):
LazyRouteMap {
const route: string = lazyRoute.routeDef.toString();
_assertRoute(allRoutes, lazyRoute);
allRoutes[route] = lazyRoute;
// StaticReflector does not support discovering annotations like `NgModule` on default
// exports
// Which means: if a default export NgModule was lazy-loaded, we can discover it, but,
// we cannot parse its routes to see if they have loadChildren or not.
if (!lazyRoute.routeDef.className) {
return allRoutes;
}
const lazyModuleSymbol = reflector.findDeclaration(
lazyRoute.absoluteFilePath, lazyRoute.routeDef.className || 'default');
const subRoutes =
_extractLazyRoutesFromStaticModule(lazyModuleSymbol, reflector, host, ROUTES);
return subRoutes.reduce(includeLazyRouteAndSubRoutes, allRoutes);
},
{});
return allLazyRoutes;
}
/**
* Try to resolve a module, and returns its absolute path.
* @private
*/
function _resolveModule(modulePath: string, containingFile: string, host: AotCompilerHost) {
const result = host.moduleNameToFileName(modulePath, containingFile);
if (!result) {
throw new Error(`Could not resolve "${modulePath}" from "${containingFile}".`);
}
return result;
}
/**
* Throw an exception if a route is in a route map, but does not point to the same module.
* @private
*/
function _assertRoute(map: LazyRouteMap, route: LazyRoute) {
const r = route.routeDef.toString();
if (map[r] && map[r].absoluteFilePath != route.absoluteFilePath) {
throw new Error(
`Duplicated path in loadChildren detected: "${r}" is used in 2 loadChildren, ` +
`but they point to different modules "(${map[r].absoluteFilePath} and ` +
`"${route.absoluteFilePath}"). Webpack cannot distinguish on context and would fail to ` +
'load the proper one.');
}
}
export function flatten<T>(list: Array<T|T[]>): T[] {
return list.reduce((flat: any[], item: T | T[]): T[] => {
const flatItem = Array.isArray(item) ? flatten(item) : item;
return (<T[]>flat).concat(flatItem);
}, []);
}
/**
* Extract all the LazyRoutes from a module. This extracts all `loadChildren` keys from this
* module and all statically referred modules.
* @private
*/
function _extractLazyRoutesFromStaticModule(
staticSymbol: StaticSymbol, reflector: StaticReflector, host: AotCompilerHost,
ROUTES: StaticSymbol): LazyRoute[] {
const moduleMetadata = _getNgModuleMetadata(staticSymbol, reflector);
const imports = flatten(moduleMetadata.imports || []);
const allRoutes: any = imports.filter(i => 'providers' in i).reduce((mem: Route[], m: any) => {
return mem.concat(_collectRoutes(m.providers || [], reflector, ROUTES));
}, _collectRoutes(moduleMetadata.providers || [], reflector, ROUTES));
const lazyRoutes: LazyRoute[] =
_collectLoadChildren(allRoutes).reduce((acc: LazyRoute[], route: string) => {
const routeDef = RouteDef.fromString(route);
const absoluteFilePath = _resolveModule(routeDef.path, staticSymbol.filePath, host);
acc.push({routeDef, absoluteFilePath});
return acc;
}, []);
const importedSymbols =
(imports as any[])
.filter(i => i instanceof StaticSymbol || i.ngModule instanceof StaticSymbol)
.map(i => {
if (i instanceof StaticSymbol) return i;
return i.ngModule;
}) as StaticSymbol[];
return importedSymbols
.reduce(
(acc: LazyRoute[], i: StaticSymbol) => {
return acc.concat(_extractLazyRoutesFromStaticModule(i, reflector, host, ROUTES));
},
[])
.concat(lazyRoutes);
}
/**
* Get the NgModule Metadata of a symbol.
* @private
*/
function _getNgModuleMetadata(staticSymbol: StaticSymbol, reflector: StaticReflector): NgModule {
const ngModules = reflector.annotations(staticSymbol).filter((s: any) => s instanceof NgModule);
if (ngModules.length === 0) {
throw new Error(`${staticSymbol.name} is not an NgModule`);
}
return ngModules[0];
}
/**
* Return the routes from the provider list.
* @private
*/
function _collectRoutes(
providers: any[], reflector: StaticReflector, ROUTES: StaticSymbol): Route[] {
return providers.reduce((routeList: Route[], p: any) => {
if (p.provide === ROUTES) {
return routeList.concat(p.useValue);
} else if (Array.isArray(p)) {
return routeList.concat(_collectRoutes(p, reflector, ROUTES));
} else {
return routeList;
}
}, []);
}
/**
* Return the loadChildren values of a list of Route.
* @private
*/
function _collectLoadChildren(routes: Route[]): string[] {
return routes.reduce((m, r) => {
if (r.loadChildren && typeof r.loadChildren === 'string') {
return m.concat(r.loadChildren);
} else if (Array.isArray(r)) {
return m.concat(_collectLoadChildren(r));
} else if (r.children) {
return m.concat(_collectLoadChildren(r.children));
} else {
return m;
}
}, []);
}