@angular/platform-browser
Version:
Angular - library for using Angular in a web browser
161 lines • 19.4 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, isPlatformServer } from '@angular/common';
import { APP_ID, CSP_NONCE, Inject, Injectable, Optional, PLATFORM_ID } from '@angular/core';
import * as i0 from "@angular/core";
/** The style elements attribute name used to set value of `APP_ID` token. */
const APP_ID_ATTRIBUTE_NAME = 'ng-app-id';
export class SharedStylesHost {
constructor(doc, appId, nonce, platformId = {}) {
this.doc = doc;
this.appId = appId;
this.nonce = nonce;
this.platformId = platformId;
// Maps all registered host nodes to a list of style nodes that have been added to the host node.
this.styleRef = new Map();
this.hostNodes = new Set();
this.styleNodesInDOM = this.collectServerRenderedStyles();
this.platformIsServer = isPlatformServer(platformId);
this.resetHostNodes();
}
addStyles(styles) {
for (const style of styles) {
const usageCount = this.changeUsageCount(style, 1);
if (usageCount === 1) {
this.onStyleAdded(style);
}
}
}
removeStyles(styles) {
for (const style of styles) {
const usageCount = this.changeUsageCount(style, -1);
if (usageCount <= 0) {
this.onStyleRemoved(style);
}
}
}
ngOnDestroy() {
const styleNodesInDOM = this.styleNodesInDOM;
if (styleNodesInDOM) {
styleNodesInDOM.forEach((node) => node.remove());
styleNodesInDOM.clear();
}
for (const style of this.getAllStyles()) {
this.onStyleRemoved(style);
}
this.resetHostNodes();
}
addHost(hostNode) {
this.hostNodes.add(hostNode);
for (const style of this.getAllStyles()) {
this.addStyleToHost(hostNode, style);
}
}
removeHost(hostNode) {
this.hostNodes.delete(hostNode);
}
getAllStyles() {
return this.styleRef.keys();
}
onStyleAdded(style) {
for (const host of this.hostNodes) {
this.addStyleToHost(host, style);
}
}
onStyleRemoved(style) {
const styleRef = this.styleRef;
styleRef.get(style)?.elements?.forEach((node) => node.remove());
styleRef.delete(style);
}
collectServerRenderedStyles() {
const styles = this.doc.head?.querySelectorAll(`style[${APP_ID_ATTRIBUTE_NAME}="${this.appId}"]`);
if (styles?.length) {
const styleMap = new Map();
styles.forEach((style) => {
if (style.textContent != null) {
styleMap.set(style.textContent, style);
}
});
return styleMap;
}
return null;
}
changeUsageCount(style, delta) {
const map = this.styleRef;
if (map.has(style)) {
const styleRefValue = map.get(style);
styleRefValue.usage += delta;
return styleRefValue.usage;
}
map.set(style, { usage: delta, elements: [] });
return delta;
}
getStyleElement(host, style) {
const styleNodesInDOM = this.styleNodesInDOM;
const styleEl = styleNodesInDOM?.get(style);
if (styleEl?.parentNode === host) {
// `styleNodesInDOM` cannot be undefined due to the above `styleNodesInDOM?.get`.
styleNodesInDOM.delete(style);
styleEl.removeAttribute(APP_ID_ATTRIBUTE_NAME);
if (typeof ngDevMode === 'undefined' || ngDevMode) {
// This attribute is solely used for debugging purposes.
styleEl.setAttribute('ng-style-reused', '');
}
return styleEl;
}
else {
const styleEl = this.doc.createElement('style');
if (this.nonce) {
styleEl.setAttribute('nonce', this.nonce);
}
styleEl.textContent = style;
if (this.platformIsServer) {
styleEl.setAttribute(APP_ID_ATTRIBUTE_NAME, this.appId);
}
return styleEl;
}
}
addStyleToHost(host, style) {
const styleEl = this.getStyleElement(host, style);
host.appendChild(styleEl);
const styleRef = this.styleRef;
const styleElRef = styleRef.get(style)?.elements;
if (styleElRef) {
styleElRef.push(styleEl);
}
else {
styleRef.set(style, { elements: [styleEl], usage: 1 });
}
}
resetHostNodes() {
const hostNodes = this.hostNodes;
hostNodes.clear();
// Re-add the head element back since this is the default host.
hostNodes.add(this.doc.head);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.2.6", ngImport: i0, type: SharedStylesHost, deps: [{ token: DOCUMENT }, { token: APP_ID }, { token: CSP_NONCE, optional: true }, { token: PLATFORM_ID }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.2.6", ngImport: i0, type: SharedStylesHost }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.2.6", ngImport: i0, type: SharedStylesHost, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: Document, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Inject,
args: [APP_ID]
}] }, { type: undefined, decorators: [{
type: Inject,
args: [CSP_NONCE]
}, {
type: Optional
}] }, { type: undefined, decorators: [{
type: Inject,
args: [PLATFORM_ID]
}] }]; } });
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* @license\n * Copyright Google LLC 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 {DOCUMENT, isPlatformServer} from '@angular/common';\nimport {APP_ID, CSP_NONCE, Inject, Injectable, OnDestroy, Optional, PLATFORM_ID} from '@angular/core';\n\n/** The style elements attribute name used to set value of `APP_ID` token. */\nconst APP_ID_ATTRIBUTE_NAME = 'ng-app-id';\n\n@Injectable()\nexport class SharedStylesHost implements OnDestroy {\n  // Maps all registered host nodes to a list of style nodes that have been added to the host node.\n  private readonly styleRef = new Map < string /** Style string */, {\n    elements: HTMLStyleElement[];\n    usage: number\n  }\n  > ();\n  private readonly hostNodes = new Set<Node>();\n  private readonly styleNodesInDOM: Map<string, HTMLStyleElement>|null;\n  private readonly platformIsServer: boolean;\n\n  constructor(\n      @Inject(DOCUMENT) private readonly doc: Document,\n      @Inject(APP_ID) private readonly appId: string,\n      @Inject(CSP_NONCE) @Optional() private nonce?: string|null,\n      @Inject(PLATFORM_ID) readonly platformId: object = {}) {\n    this.styleNodesInDOM = this.collectServerRenderedStyles();\n    this.platformIsServer = isPlatformServer(platformId);\n    this.resetHostNodes();\n  }\n\n  addStyles(styles: string[]): void {\n    for (const style of styles) {\n      const usageCount = this.changeUsageCount(style, 1);\n\n      if (usageCount === 1) {\n        this.onStyleAdded(style);\n      }\n    }\n  }\n\n  removeStyles(styles: string[]): void {\n    for (const style of styles) {\n      const usageCount = this.changeUsageCount(style, -1);\n\n      if (usageCount <= 0) {\n        this.onStyleRemoved(style);\n      }\n    }\n  }\n\n  ngOnDestroy(): void {\n    const styleNodesInDOM = this.styleNodesInDOM;\n    if (styleNodesInDOM) {\n      styleNodesInDOM.forEach((node) => node.remove());\n      styleNodesInDOM.clear();\n    }\n\n    for (const style of this.getAllStyles()) {\n      this.onStyleRemoved(style);\n    }\n\n    this.resetHostNodes();\n  }\n\n  addHost(hostNode: Node): void {\n    this.hostNodes.add(hostNode);\n\n    for (const style of this.getAllStyles()) {\n      this.addStyleToHost(hostNode, style);\n    }\n  }\n\n  removeHost(hostNode: Node): void {\n    this.hostNodes.delete(hostNode);\n  }\n\n  private getAllStyles(): IterableIterator<string> {\n    return this.styleRef.keys();\n  }\n\n  private onStyleAdded(style: string): void {\n    for (const host of this.hostNodes) {\n      this.addStyleToHost(host, style);\n    }\n  }\n\n  private onStyleRemoved(style: string): void {\n    const styleRef = this.styleRef;\n    styleRef.get(style)?.elements?.forEach((node) => node.remove());\n    styleRef.delete(style);\n  }\n\n  private collectServerRenderedStyles(): Map<string, HTMLStyleElement>|null {\n    const styles = this.doc.head?.querySelectorAll<HTMLStyleElement>(\n        `style[${APP_ID_ATTRIBUTE_NAME}=\"${this.appId}\"]`);\n\n    if (styles?.length) {\n      const styleMap = new Map<string, HTMLStyleElement>();\n\n      styles.forEach((style) => {\n        if (style.textContent != null) {\n          styleMap.set(style.textContent, style);\n        }\n      });\n\n      return styleMap;\n    }\n\n    return null;\n  }\n\n  private changeUsageCount(style: string, delta: number): number {\n    const map = this.styleRef;\n    if (map.has(style)) {\n      const styleRefValue = map.get(style)!;\n      styleRefValue.usage += delta;\n\n      return styleRefValue.usage;\n    }\n\n    map.set(style, {usage: delta, elements: []});\n    return delta;\n  }\n\n  private getStyleElement(host: Node, style: string): HTMLStyleElement {\n    const styleNodesInDOM = this.styleNodesInDOM;\n    const styleEl = styleNodesInDOM?.get(style);\n    if (styleEl?.parentNode === host) {\n      // `styleNodesInDOM` cannot be undefined due to the above `styleNodesInDOM?.get`.\n      styleNodesInDOM!.delete(style);\n\n      styleEl.removeAttribute(APP_ID_ATTRIBUTE_NAME);\n\n      if (typeof ngDevMode === 'undefined' || ngDevMode) {\n        // This attribute is solely used for debugging purposes.\n        styleEl.setAttribute('ng-style-reused', '');\n      }\n\n      return styleEl;\n    } else {\n      const styleEl = this.doc.createElement('style');\n\n      if (this.nonce) {\n        styleEl.setAttribute('nonce', this.nonce);\n      }\n\n      styleEl.textContent = style;\n\n      if (this.platformIsServer) {\n        styleEl.setAttribute(APP_ID_ATTRIBUTE_NAME, this.appId);\n      }\n\n      return styleEl;\n    }\n  }\n\n  private addStyleToHost(host: Node, style: string): void {\n    const styleEl = this.getStyleElement(host, style);\n\n    host.appendChild(styleEl);\n\n    const styleRef = this.styleRef;\n    const styleElRef = styleRef.get(style)?.elements;\n    if (styleElRef) {\n      styleElRef.push(styleEl);\n    } else {\n      styleRef.set(style, {elements: [styleEl], usage: 1});\n    }\n  }\n\n  private resetHostNodes(): void {\n    const hostNodes = this.hostNodes;\n    hostNodes.clear();\n    // Re-add the head element back since this is the default host.\n    hostNodes.add(this.doc.head);\n  }\n}\n"]}