@angular/core
Version:
Angular - the core framework
114 lines • 15.3 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
*/
/**
* Used to resolve resource URLs on `@Component` when used with JIT compilation.
*
* Example:
* ```
* @Component({
* selector: 'my-comp',
* templateUrl: 'my-comp.html', // This requires asynchronous resolution
* })
* class MyComponent{
* }
*
* // Calling `renderComponent` will fail because `renderComponent` is a synchronous process
* // and `MyComponent`'s `@Component.templateUrl` needs to be resolved asynchronously.
*
* // Calling `resolveComponentResources()` will resolve `@Component.templateUrl` into
* // `@Component.template`, which allows `renderComponent` to proceed in a synchronous manner.
*
* // Use browser's `fetch()` function as the default resource resolution strategy.
* resolveComponentResources(fetch).then(() => {
* // After resolution all URLs have been converted into `template` strings.
* renderComponent(MyComponent);
* });
*
* ```
*
* NOTE: In AOT the resolution happens during compilation, and so there should be no need
* to call this method outside JIT mode.
*
* @param resourceResolver a function which is responsible for returning a `Promise` to the
* contents of the resolved URL. Browser's `fetch()` method is a good default implementation.
*/
export function resolveComponentResources(resourceResolver) {
// Store all promises which are fetching the resources.
const componentResolved = [];
// Cache so that we don't fetch the same resource more than once.
const urlMap = new Map();
function cachedResourceResolve(url) {
let promise = urlMap.get(url);
if (!promise) {
const resp = resourceResolver(url);
urlMap.set(url, promise = resp.then(unwrapResponse));
}
return promise;
}
componentResourceResolutionQueue.forEach((component, type) => {
const promises = [];
if (component.templateUrl) {
promises.push(cachedResourceResolve(component.templateUrl).then((template) => {
component.template = template;
}));
}
const styleUrls = component.styleUrls;
const styles = component.styles || (component.styles = []);
const styleOffset = component.styles.length;
styleUrls && styleUrls.forEach((styleUrl, index) => {
styles.push(''); // pre-allocate array.
promises.push(cachedResourceResolve(styleUrl).then((style) => {
styles[styleOffset + index] = style;
styleUrls.splice(styleUrls.indexOf(styleUrl), 1);
if (styleUrls.length == 0) {
component.styleUrls = undefined;
}
}));
});
const fullyResolved = Promise.all(promises).then(() => componentDefResolved(type));
componentResolved.push(fullyResolved);
});
clearResolutionOfComponentResourcesQueue();
return Promise.all(componentResolved).then(() => undefined);
}
let componentResourceResolutionQueue = new Map();
// Track when existing ɵcmp for a Type is waiting on resources.
const componentDefPendingResolution = new Set();
export function maybeQueueResolutionOfComponentResources(type, metadata) {
if (componentNeedsResolution(metadata)) {
componentResourceResolutionQueue.set(type, metadata);
componentDefPendingResolution.add(type);
}
}
export function isComponentDefPendingResolution(type) {
return componentDefPendingResolution.has(type);
}
export function componentNeedsResolution(component) {
return !!((component.templateUrl && !component.hasOwnProperty('template')) ||
component.styleUrls && component.styleUrls.length);
}
export function clearResolutionOfComponentResourcesQueue() {
const old = componentResourceResolutionQueue;
componentResourceResolutionQueue = new Map();
return old;
}
export function restoreComponentResolutionQueue(queue) {
componentDefPendingResolution.clear();
queue.forEach((_, type) => componentDefPendingResolution.add(type));
componentResourceResolutionQueue = queue;
}
export function isComponentResourceResolutionQueueEmpty() {
return componentResourceResolutionQueue.size === 0;
}
function unwrapResponse(response) {
return typeof response == 'string' ? response : response.text();
}
function componentDefResolved(type) {
componentDefPendingResolution.delete(type);
}
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Browser's `fetch()` method is a good default implementation.\n */\nexport function resolveComponentResources(\n    resourceResolver: (url: string) => (Promise<string|{text(): Promise<string>}>)): Promise<void> {\n  // Store all promises which are fetching the resources.\n  const componentResolved: Promise<void>[] = [];\n\n  // Cache so that we don't fetch the same resource more than once.\n  const urlMap = new Map<string, Promise<string>>();\n  function cachedResourceResolve(url: string): Promise<string> {\n    let promise = urlMap.get(url);\n    if (!promise) {\n      const resp = resourceResolver(url);\n      urlMap.set(url, promise = resp.then(unwrapResponse));\n    }\n    return promise;\n  }\n\n  componentResourceResolutionQueue.forEach((component: Component, type: Type<any>) => {\n    const promises: Promise<void>[] = [];\n    if (component.templateUrl) {\n      promises.push(cachedResourceResolve(component.templateUrl).then((template) => {\n        component.template = template;\n      }));\n    }\n    const styleUrls = component.styleUrls;\n    const styles = component.styles || (component.styles = []);\n    const styleOffset = component.styles.length;\n    styleUrls && styleUrls.forEach((styleUrl, index) => {\n      styles.push('');  // pre-allocate array.\n      promises.push(cachedResourceResolve(styleUrl).then((style) => {\n        styles[styleOffset + index] = style;\n        styleUrls.splice(styleUrls.indexOf(styleUrl), 1);\n        if (styleUrls.length == 0) {\n          component.styleUrls = undefined;\n        }\n      }));\n    });\n    const fullyResolved = Promise.all(promises).then(() => componentDefResolved(type));\n    componentResolved.push(fullyResolved);\n  });\n  clearResolutionOfComponentResourcesQueue();\n  return Promise.all(componentResolved).then(() => undefined);\n}\n\nlet componentResourceResolutionQueue = new Map<Type<any>, Component>();\n\n// Track when existing ɵcmp for a Type is waiting on resources.\nconst componentDefPendingResolution = new Set<Type<any>>();\n\nexport function maybeQueueResolutionOfComponentResources(type: Type<any>, metadata: Component) {\n  if (componentNeedsResolution(metadata)) {\n    componentResourceResolutionQueue.set(type, metadata);\n    componentDefPendingResolution.add(type);\n  }\n}\n\nexport function isComponentDefPendingResolution(type: Type<any>): boolean {\n  return componentDefPendingResolution.has(type);\n}\n\nexport function componentNeedsResolution(component: Component): boolean {\n  return !!(\n      (component.templateUrl && !component.hasOwnProperty('template')) ||\n      component.styleUrls && component.styleUrls.length);\n}\nexport function clearResolutionOfComponentResourcesQueue(): Map<Type<any>, Component> {\n  const old = componentResourceResolutionQueue;\n  componentResourceResolutionQueue = new Map();\n  return old;\n}\n\nexport function restoreComponentResolutionQueue(queue: Map<Type<any>, Component>): void {\n  componentDefPendingResolution.clear();\n  queue.forEach((_, type) => componentDefPendingResolution.add(type));\n  componentResourceResolutionQueue = queue;\n}\n\nexport function isComponentResourceResolutionQueueEmpty() {\n  return componentResourceResolutionQueue.size === 0;\n}\n\nfunction unwrapResponse(response: string|{text(): Promise<string>}): string|Promise<string> {\n  return typeof response == 'string' ? response : response.text();\n}\n\nfunction componentDefResolved(type: Type<any>): void {\n  componentDefPendingResolution.delete(type);\n}\n"]}