@angular/router
Version:
Angular - the routing library
100 lines (99 loc) • 11.5 kB
JavaScript
/**
* @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
*/
import { ɵisObservable as isObservable, ɵisPromise as isPromise } from '@angular/core';
import { from, of } from 'rxjs';
import { concatAll, every, last as lastValue, map, mergeAll } from 'rxjs/operators';
import { PRIMARY_OUTLET } from '../shared';
export function shallowEqualArrays(a, b) {
if (a.length !== b.length)
return false;
for (var i = 0; i < a.length; ++i) {
if (!shallowEqual(a[i], b[i]))
return false;
}
return true;
}
export function shallowEqual(a, b) {
var k1 = Object.keys(a);
var k2 = Object.keys(b);
if (k1.length != k2.length) {
return false;
}
var key;
for (var i = 0; i < k1.length; i++) {
key = k1[i];
if (a[key] !== b[key]) {
return false;
}
}
return true;
}
/**
* Flattens single-level nested arrays.
*/
export function flatten(arr) {
return Array.prototype.concat.apply([], arr);
}
/**
* Return the last element of an array.
*/
export function last(a) {
return a.length > 0 ? a[a.length - 1] : null;
}
/**
* Verifys all booleans in an array are `true`.
*/
export function and(bools) {
return !bools.some(function (v) { return !v; });
}
export function forEach(map, callback) {
for (var prop in map) {
if (map.hasOwnProperty(prop)) {
callback(map[prop], prop);
}
}
}
export function waitForMap(obj, fn) {
if (Object.keys(obj).length === 0) {
return of({});
}
var waitHead = [];
var waitTail = [];
var res = {};
forEach(obj, function (a, k) {
var mapped = fn(k, a).pipe(map(function (r) { return res[k] = r; }));
if (k === PRIMARY_OUTLET) {
waitHead.push(mapped);
}
else {
waitTail.push(mapped);
}
});
// Closure compiler has problem with using spread operator here. So just using Array.concat.
return of.apply(null, waitHead.concat(waitTail)).pipe(concatAll(), lastValue(), map(function () { return res; }));
}
/**
* ANDs Observables by merging all input observables, reducing to an Observable verifying all
* input Observables return `true`.
*/
export function andObservables(observables) {
return observables.pipe(mergeAll(), every(function (result) { return result === true; }));
}
export function wrapIntoObservable(value) {
if (isObservable(value)) {
return value;
}
if (isPromise(value)) {
// Use `Promise.resolve()` to wrap promise-like instances.
// Required ie when a Resolver returns a AngularJS `$q` promise to correctly trigger the
// change detection.
return from(Promise.resolve(value));
}
return of(value);
}
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {NgModuleFactory, ɵisObservable as isObservable, ɵisPromise as isPromise} from '@angular/core';\nimport {Observable, from, of } from 'rxjs';\nimport {concatAll, every, last as lastValue, map, mergeAll} from 'rxjs/operators';\n\nimport {PRIMARY_OUTLET} from '../shared';\n\nexport function shallowEqualArrays(a: any[], b: any[]): boolean {\n  if (a.length !== b.length) return false;\n  for (let i = 0; i < a.length; ++i) {\n    if (!shallowEqual(a[i], b[i])) return false;\n  }\n  return true;\n}\n\nexport function shallowEqual(a: {[x: string]: any}, b: {[x: string]: any}): boolean {\n  const k1 = Object.keys(a);\n  const k2 = Object.keys(b);\n  if (k1.length != k2.length) {\n    return false;\n  }\n  let key: string;\n  for (let i = 0; i < k1.length; i++) {\n    key = k1[i];\n    if (a[key] !== b[key]) {\n      return false;\n    }\n  }\n  return true;\n}\n\n/**\n * Flattens single-level nested arrays.\n */\nexport function flatten<T>(arr: T[][]): T[] {\n  return Array.prototype.concat.apply([], arr);\n}\n\n/**\n * Return the last element of an array.\n */\nexport function last<T>(a: T[]): T|null {\n  return a.length > 0 ? a[a.length - 1] : null;\n}\n\n/**\n * Verifys all booleans in an array are `true`.\n */\nexport function and(bools: boolean[]): boolean {\n  return !bools.some(v => !v);\n}\n\nexport function forEach<K, V>(map: {[key: string]: V}, callback: (v: V, k: string) => void): void {\n  for (const prop in map) {\n    if (map.hasOwnProperty(prop)) {\n      callback(map[prop], prop);\n    }\n  }\n}\n\nexport function waitForMap<A, B>(\n    obj: {[k: string]: A}, fn: (k: string, a: A) => Observable<B>): Observable<{[k: string]: B}> {\n  if (Object.keys(obj).length === 0) {\n    return of ({});\n  }\n\n  const waitHead: Observable<B>[] = [];\n  const waitTail: Observable<B>[] = [];\n  const res: {[k: string]: B} = {};\n\n  forEach(obj, (a: A, k: string) => {\n    const mapped = fn(k, a).pipe(map((r: B) => res[k] = r));\n    if (k === PRIMARY_OUTLET) {\n      waitHead.push(mapped);\n    } else {\n      waitTail.push(mapped);\n    }\n  });\n\n  // Closure compiler has problem with using spread operator here. So just using Array.concat.\n  return of .apply(null, waitHead.concat(waitTail)).pipe(concatAll(), lastValue(), map(() => res));\n}\n\n/**\n * ANDs Observables by merging all input observables, reducing to an Observable verifying all\n * input Observables return `true`.\n */\nexport function andObservables(observables: Observable<Observable<any>>): Observable<boolean> {\n  return observables.pipe(mergeAll(), every((result: any) => result === true));\n}\n\nexport function wrapIntoObservable<T>(value: T | NgModuleFactory<T>| Promise<T>| Observable<T>):\n    Observable<T> {\n  if (isObservable(value)) {\n    return value;\n  }\n\n  if (isPromise(value)) {\n    // Use `Promise.resolve()` to wrap promise-like instances.\n    // Required ie when a Resolver returns a AngularJS `$q` promise to correctly trigger the\n    // change detection.\n    return from(Promise.resolve(value));\n  }\n\n  return of (value as T);\n}\n"]}