@angular/platform-browser
Version:
Angular - library for using Angular in a web browser
158 lines • 16.1 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { DOCUMENT } from '@angular/common';
import { APP_ID, Injectable, NgModule } from '@angular/core';
import * as i0 from "@angular/core";
export function escapeHtml(text) {
const escapedText = {
'&': '&a;',
'"': '&q;',
'\'': '&s;',
'<': '&l;',
'>': '&g;',
};
return text.replace(/[&"'<>]/g, s => escapedText[s]);
}
export function unescapeHtml(text) {
const unescapedText = {
'&a;': '&',
'&q;': '"',
'&s;': '\'',
'&l;': '<',
'&g;': '>',
};
return text.replace(/&[^;]+;/g, s => unescapedText[s]);
}
/**
* Create a `StateKey<T>` that can be used to store value of type T with `TransferState`.
*
* Example:
*
* ```
* const COUNTER_KEY = makeStateKey<number>('counter');
* let value = 10;
*
* transferState.set(COUNTER_KEY, value);
* ```
*
* @publicApi
*/
export function makeStateKey(key) {
return key;
}
/**
* A key value store that is transferred from the application on the server side to the application
* on the client side.
*
* `TransferState` will be available as an injectable token. To use it import
* `ServerTransferStateModule` on the server and `BrowserTransferStateModule` on the client.
*
* The values in the store are serialized/deserialized using JSON.stringify/JSON.parse. So only
* boolean, number, string, null and non-class objects will be serialized and deserialized in a
* non-lossy manner.
*
* @publicApi
*/
export class TransferState {
constructor() {
this.store = {};
this.onSerializeCallbacks = {};
}
/** @internal */
static init(initState) {
const transferState = new TransferState();
transferState.store = initState;
return transferState;
}
/**
* Get the value corresponding to a key. Return `defaultValue` if key is not found.
*/
get(key, defaultValue) {
return this.store[key] !== undefined ? this.store[key] : defaultValue;
}
/**
* Set the value corresponding to a key.
*/
set(key, value) {
this.store[key] = value;
}
/**
* Remove a key from the store.
*/
remove(key) {
delete this.store[key];
}
/**
* Test whether a key exists in the store.
*/
hasKey(key) {
return this.store.hasOwnProperty(key);
}
/**
* Register a callback to provide the value for a key when `toJson` is called.
*/
onSerialize(key, callback) {
this.onSerializeCallbacks[key] = callback;
}
/**
* Serialize the current state of the store to JSON.
*/
toJson() {
// Call the onSerialize callbacks and put those values into the store.
for (const key in this.onSerializeCallbacks) {
if (this.onSerializeCallbacks.hasOwnProperty(key)) {
try {
this.store[key] = this.onSerializeCallbacks[key]();
}
catch (e) {
console.warn('Exception in onSerialize callback: ', e);
}
}
}
return JSON.stringify(this.store);
}
}
TransferState.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: TransferState, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
TransferState.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: TransferState });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: TransferState, decorators: [{
type: Injectable
}] });
export function initTransferState(doc, appId) {
// Locate the script tag with the JSON data transferred from the server.
// The id of the script tag is set to the Angular appId + 'state'.
const script = doc.getElementById(appId + '-state');
let initialState = {};
if (script && script.textContent) {
try {
// Avoid using any here as it triggers lint errors in google3 (any is not allowed).
initialState = JSON.parse(unescapeHtml(script.textContent));
}
catch (e) {
console.warn('Exception while restoring TransferState for app ' + appId, e);
}
}
return TransferState.init(initialState);
}
/**
* NgModule to install on the client side while using the `TransferState` to transfer state from
* server to client.
*
* @publicApi
*/
export class BrowserTransferStateModule {
}
BrowserTransferStateModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: BrowserTransferStateModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
BrowserTransferStateModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: BrowserTransferStateModule });
BrowserTransferStateModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: BrowserTransferStateModule, providers: [{ provide: TransferState, useFactory: initTransferState, deps: [DOCUMENT, APP_ID] }] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.3", ngImport: i0, type: BrowserTransferStateModule, decorators: [{
type: NgModule,
args: [{
providers: [{ provide: TransferState, useFactory: initTransferState, deps: [DOCUMENT, APP_ID] }],
}]
}] });
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To use it import\n * `ServerTransferStateModule` on the server and `BrowserTransferStateModule` on the client.\n *\n * The values in the store are serialized/deserialized using JSON.stringify/JSON.parse. So only\n * boolean, number, string, null and non-class objects will be serialized and deserialized in a\n * non-lossy manner.\n *\n * @publicApi\n */\n@Injectable()\nexport class TransferState {\n  private store: {[k: string]: {}|undefined} = {};\n  private onSerializeCallbacks: {[k: string]: () => {} | undefined} = {};\n\n  /** @internal */\n  static init(initState: {}) {\n    const transferState = new TransferState();\n    transferState.store = initState;\n    return transferState;\n  }\n\n  /**\n   * Get the value corresponding to a key. Return `defaultValue` if key is not found.\n   */\n  get<T>(key: StateKey<T>, defaultValue: T): T {\n    return this.store[key] !== undefined ? this.store[key] as T : defaultValue;\n  }\n\n  /**\n   * Set the value corresponding to a key.\n   */\n  set<T>(key: StateKey<T>, value: T): void {\n    this.store[key] = value;\n  }\n\n  /**\n   * Remove a key from the store.\n   */\n  remove<T>(key: StateKey<T>): void {\n    delete this.store[key];\n  }\n\n  /**\n   * Test whether a key exists in the store.\n   */\n  hasKey<T>(key: StateKey<T>) {\n    return this.store.hasOwnProperty(key);\n  }\n\n  /**\n   * Register a callback to provide the value for a key when `toJson` is called.\n   */\n  onSerialize<T>(key: StateKey<T>, callback: () => T): void {\n    this.onSerializeCallbacks[key] = callback;\n  }\n\n  /**\n   * Serialize the current state of the store to JSON.\n   */\n  toJson(): string {\n    // Call the onSerialize callbacks and put those values into the store.\n    for (const key in this.onSerializeCallbacks) {\n      if (this.onSerializeCallbacks.hasOwnProperty(key)) {\n        try {\n          this.store[key] = this.onSerializeCallbacks[key]();\n        } catch (e) {\n          console.warn('Exception in onSerialize callback: ', e);\n        }\n      }\n    }\n    return JSON.stringify(this.store);\n  }\n}\n\nexport function initTransferState(doc: Document, appId: string) {\n  // Locate the script tag with the JSON data transferred from the server.\n  // The id of the script tag is set to the Angular appId + 'state'.\n  const script = doc.getElementById(appId + '-state');\n  let initialState = {};\n  if (script && script.textContent) {\n    try {\n      // Avoid using any here as it triggers lint errors in google3 (any is not allowed).\n      initialState = JSON.parse(unescapeHtml(script.textContent)) as {};\n    } catch (e) {\n      console.warn('Exception while restoring TransferState for app ' + appId, e);\n    }\n  }\n  return TransferState.init(initialState);\n}\n\n/**\n * NgModule to install on the client side while using the `TransferState` to transfer state from\n * server to client.\n *\n * @publicApi\n */\n@NgModule({\n  providers: [{provide: TransferState, useFactory: initTransferState, deps: [DOCUMENT, APP_ID]}],\n})\nexport class BrowserTransferStateModule {\n}\n"]}