/** * @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 { HttpClient } from '@angular/common/http'; import { ErrorHandler, Inject, Injectable, Optional, SecurityContext, SkipSelf, } from '@angular/core'; import { DomSanitizer } from '@angular/platform-browser'; import { forkJoin, of as observableOf, throwError as observableThrow } from 'rxjs'; import { catchError, finalize, map, share, tap } from 'rxjs/operators'; import * as i0 from "@angular/core"; import * as i1 from "@angular/common/http"; import * as i2 from "@angular/platform-browser"; import * as i3 from "@angular/common"; /** * Returns an exception to be thrown in the case when attempting to * load an icon with a name that cannot be found. * @docs-private */ export function getMatIconNameNotFoundError(iconName) { return Error(`Unable to find icon with the name "${iconName}"`); } /** * Returns an exception to be thrown when the consumer attempts to use * `` without including @angular/common/http. * @docs-private */ export function getMatIconNoHttpProviderError() { return Error('Could not find HttpClient provider for use with Angular Material icons. ' + 'Please include the HttpClientModule from @angular/common/http in your ' + 'app imports.'); } /** * Returns an exception to be thrown when a URL couldn't be sanitized. * @param url URL that was attempted to be sanitized. * @docs-private */ export function getMatIconFailedToSanitizeUrlError(url) { return Error(`The URL provided to MatIconRegistry was not trusted as a resource URL ` + `via Angular's DomSanitizer. Attempted URL was "${url}".`); } /** * Returns an exception to be thrown when a HTML string couldn't be sanitized. * @param literal HTML that was attempted to be sanitized. * @docs-private */ export function getMatIconFailedToSanitizeLiteralError(literal) { return Error(`The literal provided to MatIconRegistry was not trusted as safe HTML by ` + `Angular's DomSanitizer. Attempted literal was "${literal}".`); } /** * Configuration for an icon, including the URL and possibly the cached SVG element. * @docs-private */ class SvgIconConfig { constructor(url, svgText, options) { this.url = url; this.svgText = svgText; this.options = options; } } /** * Service to register and display icons used by the `` component. * - Registers icon URLs by namespace and name. * - Registers icon set URLs by namespace. * - Registers aliases for CSS classes, for use with icon fonts. * - Loads icons from URLs and extracts individual icons from icon sets. */ export class MatIconRegistry { constructor(_httpClient, _sanitizer, document, _errorHandler) { this._httpClient = _httpClient; this._sanitizer = _sanitizer; this._errorHandler = _errorHandler; /** * URLs and cached SVG elements for individual icons. Keys are of the format "[namespace]:[icon]". */ this._svgIconConfigs = new Map(); /** * SvgIconConfig objects and cached SVG elements for icon sets, keyed by namespace. * Multiple icon sets can be registered under the same namespace. */ this._iconSetConfigs = new Map(); /** Cache for icons loaded by direct URLs. */ this._cachedIconsByUrl = new Map(); /** In-progress icon fetches. Used to coalesce multiple requests to the same URL. */ this._inProgressUrlFetches = new Map(); /** Map from font identifiers to their CSS class names. Used for icon fonts. */ this._fontCssClassesByAlias = new Map(); /** Registered icon resolver functions. */ this._resolvers = []; /** * The CSS class to apply when an `` component has no icon name, url, or font specified. * The default 'material-icons' value assumes that the material icon font has been loaded as * described at http://google.github.io/material-design-icons/#icon-font-for-the-web */ this._defaultFontSetClass = 'material-icons'; this._document = document; } /** * Registers an icon by URL in the default namespace. * @param iconName Name under which the icon should be registered. * @param url */ addSvgIcon(iconName, url, options) { return this.addSvgIconInNamespace('', iconName, url, options); } /** * Registers an icon using an HTML string in the default namespace. * @param iconName Name under which the icon should be registered. * @param literal SVG source of the icon. */ addSvgIconLiteral(iconName, literal, options) { return this.addSvgIconLiteralInNamespace('', iconName, literal, options); } /** * Registers an icon by URL in the specified namespace. * @param namespace Namespace in which the icon should be registered. * @param iconName Name under which the icon should be registered. * @param url */ addSvgIconInNamespace(namespace, iconName, url, options) { return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig(url, null, options)); } /** * Registers an icon resolver function with the registry. The function will be invoked with the * name and namespace of an icon when the registry tries to resolve the URL from which to fetch * the icon. The resolver is expected to return a `SafeResourceUrl` that points to the icon, * an object with the icon URL and icon options, or `null` if the icon is not supported. Resolvers * will be invoked in the order in which they have been registered. * @param resolver Resolver function to be registered. */ addSvgIconResolver(resolver) { this._resolvers.push(resolver); return this; } /** * Registers an icon using an HTML string in the specified namespace. * @param namespace Namespace in which the icon should be registered. * @param iconName Name under which the icon should be registered. * @param literal SVG source of the icon. */ addSvgIconLiteralInNamespace(namespace, iconName, literal, options) { const cleanLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal); // TODO: add an ngDevMode check if (!cleanLiteral) { throw getMatIconFailedToSanitizeLiteralError(literal); } return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig('', cleanLiteral, options)); } /** * Registers an icon set by URL in the default namespace. * @param url */ addSvgIconSet(url, options) { return this.addSvgIconSetInNamespace('', url, options); } /** * Registers an icon set using an HTML string in the default namespace. * @param literal SVG source of the icon set. */ addSvgIconSetLiteral(literal, options) { return this.addSvgIconSetLiteralInNamespace('', literal, options); } /** * Registers an icon set by URL in the specified namespace. * @param namespace Namespace in which to register the icon set. * @param url */ addSvgIconSetInNamespace(namespace, url, options) { return this._addSvgIconSetConfig(namespace, new SvgIconConfig(url, null, options)); } /** * Registers an icon set using an HTML string in the specified namespace. * @param namespace Namespace in which to register the icon set. * @param literal SVG source of the icon set. */ addSvgIconSetLiteralInNamespace(namespace, literal, options) { const cleanLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal); if (!cleanLiteral) { throw getMatIconFailedToSanitizeLiteralError(literal); } return this._addSvgIconSetConfig(namespace, new SvgIconConfig('', cleanLiteral, options)); } /** * Defines an alias for a CSS class name to be used for icon fonts. Creating an matIcon * component with the alias as the fontSet input will cause the class name to be applied * to the `` element. * * @param alias Alias for the font. * @param className Class name override to be used instead of the alias. */ registerFontClassAlias(alias, className = alias) { this._fontCssClassesByAlias.set(alias, className); return this; } /** * Returns the CSS class name associated with the alias by a previous call to * registerFontClassAlias. If no CSS class has been associated, returns the alias unmodified. */ classNameForFontAlias(alias) { return this._fontCssClassesByAlias.get(alias) || alias; } /** * Sets the CSS class name to be used for icon fonts when an `` component does not * have a fontSet input value, and is not loading an icon by name or URL. * * @param className */ setDefaultFontSetClass(className) { this._defaultFontSetClass = className; return this; } /** * Returns the CSS class name to be used for icon fonts when an `` component does not * have a fontSet input value, and is not loading an icon by name or URL. */ getDefaultFontSetClass() { return this._defaultFontSetClass; } /** * Returns an Observable that produces the icon (as an `` DOM element) from the given URL. * The response from the URL may be cached so this will not always cause an HTTP request, but * the produced element will always be a new copy of the originally fetched icon. (That is, * it will not contain any modifications made to elements previously returned). * * @param safeUrl URL from which to fetch the SVG icon. */ getSvgIconFromUrl(safeUrl) { const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, safeUrl); if (!url) { throw getMatIconFailedToSanitizeUrlError(safeUrl); } const cachedIcon = this._cachedIconsByUrl.get(url); if (cachedIcon) { return observableOf(cloneSvg(cachedIcon)); } return this._loadSvgIconFromConfig(new SvgIconConfig(safeUrl, null)).pipe(tap(svg => this._cachedIconsByUrl.set(url, svg)), map(svg => cloneSvg(svg))); } /** * Returns an Observable that produces the icon (as an `` DOM element) with the given name * and namespace. The icon must have been previously registered with addIcon or addIconSet; * if not, the Observable will throw an error. * * @param name Name of the icon to be retrieved. * @param namespace Namespace in which to look for the icon. */ getNamedSvgIcon(name, namespace = '') { const key = iconKey(namespace, name); let config = this._svgIconConfigs.get(key); // Return (copy of) cached icon if possible. if (config) { return this._getSvgFromConfig(config); } // Otherwise try to resolve the config from one of the resolver functions. config = this._getIconConfigFromResolvers(namespace, name); if (config) { this._svgIconConfigs.set(key, config); return this._getSvgFromConfig(config); } // See if we have any icon sets registered for the namespace. const iconSetConfigs = this._iconSetConfigs.get(namespace); if (iconSetConfigs) { return this._getSvgFromIconSetConfigs(name, iconSetConfigs); } return observableThrow(getMatIconNameNotFoundError(key)); } ngOnDestroy() { this._resolvers = []; this._svgIconConfigs.clear(); this._iconSetConfigs.clear(); this._cachedIconsByUrl.clear(); } /** * Returns the cached icon for a SvgIconConfig if available, or fetches it from its URL if not. */ _getSvgFromConfig(config) { if (config.svgText) { // We already have the SVG element for this icon, return a copy. return observableOf(cloneSvg(this._svgElementFromConfig(config))); } else { // Fetch the icon from the config's URL, cache it, and return a copy. return this._loadSvgIconFromConfig(config).pipe(map(svg => cloneSvg(svg))); } } /** * Attempts to find an icon with the specified name in any of the SVG icon sets. * First searches the available cached icons for a nested element with a matching name, and * if found copies the element to a new `` element. If not found, fetches all icon sets * that have not been cached, and searches again after all fetches are completed. * The returned Observable produces the SVG element if possible, and throws * an error if no icon with the specified name can be found. */ _getSvgFromIconSetConfigs(name, iconSetConfigs) { // For all the icon set SVG elements we've fetched, see if any contain an icon with the // requested name. const namedIcon = this._extractIconWithNameFromAnySet(name, iconSetConfigs); if (namedIcon) { // We could cache namedIcon in _svgIconConfigs, but since we have to make a copy every // time anyway, there's probably not much advantage compared to just always extracting // it from the icon set. return observableOf(namedIcon); } // Not found in any cached icon sets. If there are icon sets with URLs that we haven't // fetched, fetch them now and look for iconName in the results. const iconSetFetchRequests = iconSetConfigs .filter(iconSetConfig => !iconSetConfig.svgText) .map(iconSetConfig => { return this._loadSvgIconSetFromConfig(iconSetConfig).pipe(catchError((err) => { const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, iconSetConfig.url); // Swallow errors fetching individual URLs so the // combined Observable won't necessarily fail. const errorMessage = `Loading icon set URL: ${url} failed: ${err.message}`; this._errorHandler.handleError(new Error(errorMessage)); return observableOf(null); })); }); // Fetch all the icon set URLs. When the requests complete, every IconSet should have a // cached SVG element (unless the request failed), and we can check again for the icon. return forkJoin(iconSetFetchRequests).pipe(map(() => { const foundIcon = this._extractIconWithNameFromAnySet(name, iconSetConfigs); // TODO: add an ngDevMode check if (!foundIcon) { throw getMatIconNameNotFoundError(name); } return foundIcon; })); } /** * Searches the cached SVG elements for the given icon sets for a nested icon element whose "id" * tag matches the specified name. If found, copies the nested element to a new SVG element and * returns it. Returns null if no matching element is found. */ _extractIconWithNameFromAnySet(iconName, iconSetConfigs) { // Iterate backwards, so icon sets added later have precedence. for (let i = iconSetConfigs.length - 1; i >= 0; i--) { const config = iconSetConfigs[i]; // Parsing the icon set's text into an SVG element can be expensive. We can avoid some of // the parsing by doing a quick check using `indexOf` to see if there's any chance for the // icon to be in the set. This won't be 100% accurate, but it should help us avoid at least // some of the parsing. if (config.svgText && config.svgText.indexOf(iconName) > -1) { const svg = this._svgElementFromConfig(config); const foundIcon = this._extractSvgIconFromSet(svg, iconName, config.options); if (foundIcon) { return foundIcon; } } } return null; } /** * Loads the content of the icon URL specified in the SvgIconConfig and creates an SVG element * from it. */ _loadSvgIconFromConfig(config) { return this._fetchIcon(config).pipe(tap(svgText => config.svgText = svgText), map(() => this._svgElementFromConfig(config))); } /** * Loads the content of the icon set URL specified in the * SvgIconConfig and attaches it to the config. */ _loadSvgIconSetFromConfig(config) { if (config.svgText) { return observableOf(null); } return this._fetchIcon(config).pipe(tap(svgText => config.svgText = svgText)); } /** * Searches the cached element of the given SvgIconConfig for a nested icon element whose "id" * tag matches the specified name. If found, copies the nested element to a new SVG element and * returns it. Returns null if no matching element is found. */ _extractSvgIconFromSet(iconSet, iconName, options) { // Use the `id="iconName"` syntax in order to escape special // characters in the ID (versus using the #iconName syntax). const iconSource = iconSet.querySelector(`[id="${iconName}"]`); if (!iconSource) { return null; } // Clone the element and remove the ID to prevent multiple elements from being added // to the page with the same ID. const iconElement = iconSource.cloneNode(true); iconElement.removeAttribute('id'); // If the icon node is itself an node, clone and return it directly. If not, set it as // the content of a new node. if (iconElement.nodeName.toLowerCase() === 'svg') { return this._setSvgAttributes(iconElement, options); } // If the node is a , it won't be rendered so we have to convert it into . Note // that the same could be achieved by referring to it via , however the // tag is problematic on Firefox, because it needs to include the current page path. if (iconElement.nodeName.toLowerCase() === 'symbol') { return this._setSvgAttributes(this._toSvgElement(iconElement), options); } // createElement('SVG') doesn't work as expected; the DOM ends up with // the correct nodes, but the SVG content doesn't render. Instead we // have to create an empty SVG node using innerHTML and append its content. // Elements created using DOMParser.parseFromString have the same problem. // http://stackoverflow.com/questions/23003278/svg-innerhtml-in-firefox-can-not-display const svg = this._svgElementFromString(''); // Clone the node so we don't remove it from the parent icon set element. svg.appendChild(iconElement); return this._setSvgAttributes(svg, options); } /** * Creates a DOM element from the given SVG string. */ _svgElementFromString(str) { const div = this._document.createElement('DIV'); div.innerHTML = str; const svg = div.querySelector('svg'); // TODO: add an ngDevMode check if (!svg) { throw Error(' tag not found'); } return svg; } /** * Converts an element into an SVG node by cloning all of its children. */ _toSvgElement(element) { const svg = this._svgElementFromString(''); const attributes = element.attributes; // Copy over all the attributes from the `symbol` to the new SVG, except the id. for (let i = 0; i < attributes.length; i++) { const { name, value } = attributes[i]; if (name !== 'id') { svg.setAttribute(name, value); } } for (let i = 0; i < element.childNodes.length; i++) { if (element.childNodes[i].nodeType === this._document.ELEMENT_NODE) { svg.appendChild(element.childNodes[i].cloneNode(true)); } } return svg; } /** * Sets the default attributes for an SVG element to be used as an icon. */ _setSvgAttributes(svg, options) { svg.setAttribute('fit', ''); svg.setAttribute('height', '100%'); svg.setAttribute('width', '100%'); svg.setAttribute('preserveAspectRatio', 'xMidYMid meet'); svg.setAttribute('focusable', 'false'); // Disable IE11 default behavior to make SVGs focusable. if (options && options.viewBox) { svg.setAttribute('viewBox', options.viewBox); } return svg; } /** * Returns an Observable which produces the string contents of the given icon. Results may be * cached, so future calls with the same URL may not cause another HTTP request. */ _fetchIcon(iconConfig) { var _a; const { url: safeUrl, options } = iconConfig; const withCredentials = (_a = options === null || options === void 0 ? void 0 : options.withCredentials) !== null && _a !== void 0 ? _a : false; if (!this._httpClient) { throw getMatIconNoHttpProviderError(); } // TODO: add an ngDevMode check if (safeUrl == null) { throw Error(`Cannot fetch icon from URL "${safeUrl}".`); } const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, safeUrl); // TODO: add an ngDevMode check if (!url) { throw getMatIconFailedToSanitizeUrlError(safeUrl); } // Store in-progress fetches to avoid sending a duplicate request for a URL when there is // already a request in progress for that URL. It's necessary to call share() on the // Observable returned by http.get() so that multiple subscribers don't cause multiple XHRs. const inProgressFetch = this._inProgressUrlFetches.get(url); if (inProgressFetch) { return inProgressFetch; } const req = this._httpClient.get(url, { responseType: 'text', withCredentials }).pipe(finalize(() => this._inProgressUrlFetches.delete(url)), share()); this._inProgressUrlFetches.set(url, req); return req; } /** * Registers an icon config by name in the specified namespace. * @param namespace Namespace in which to register the icon config. * @param iconName Name under which to register the config. * @param config Config to be registered. */ _addSvgIconConfig(namespace, iconName, config) { this._svgIconConfigs.set(iconKey(namespace, iconName), config); return this; } /** * Registers an icon set config in the specified namespace. * @param namespace Namespace in which to register the icon config. * @param config Config to be registered. */ _addSvgIconSetConfig(namespace, config) { const configNamespace = this._iconSetConfigs.get(namespace); if (configNamespace) { configNamespace.push(config); } else { this._iconSetConfigs.set(namespace, [config]); } return this; } /** Parses a config's text into an SVG element. */ _svgElementFromConfig(config) { if (!config.svgElement) { const svg = this._svgElementFromString(config.svgText); this._setSvgAttributes(svg, config.options); config.svgElement = svg; } return config.svgElement; } /** Tries to create an icon config through the registered resolver functions. */ _getIconConfigFromResolvers(namespace, name) { for (let i = 0; i < this._resolvers.length; i++) { const result = this._resolvers[i](name, namespace); if (result) { return isSafeUrlWithOptions(result) ? new SvgIconConfig(result.url, null, result.options) : new SvgIconConfig(result, null); } } return undefined; } } MatIconRegistry.ɵprov = i0.ɵɵdefineInjectable({ factory: function MatIconRegistry_Factory() { return new MatIconRegistry(i0.ɵɵinject(i1.HttpClient, 8), i0.ɵɵinject(i2.DomSanitizer), i0.ɵɵinject(i3.DOCUMENT, 8), i0.ɵɵinject(i0.ErrorHandler)); }, token: MatIconRegistry, providedIn: "root" }); MatIconRegistry.decorators = [ { type: Injectable, args: [{ providedIn: 'root' },] } ]; MatIconRegistry.ctorParameters = () => [ { type: HttpClient, decorators: [{ type: Optional }] }, { type: DomSanitizer }, { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] }, { type: ErrorHandler } ]; /** @docs-private */ export function ICON_REGISTRY_PROVIDER_FACTORY(parentRegistry, httpClient, sanitizer, errorHandler, document) { return parentRegistry || new MatIconRegistry(httpClient, sanitizer, document, errorHandler); } /** @docs-private */ export const ICON_REGISTRY_PROVIDER = { // If there is already an MatIconRegistry available, use that. Otherwise, provide a new one. provide: MatIconRegistry, deps: [ [new Optional(), new SkipSelf(), MatIconRegistry], [new Optional(), HttpClient], DomSanitizer, ErrorHandler, [new Optional(), DOCUMENT], ], useFactory: ICON_REGISTRY_PROVIDER_FACTORY, }; /** Clones an SVGElement while preserving type information. */ function cloneSvg(svg) { return svg.cloneNode(true); } /** Returns the cache key to use for an icon namespace and name. */ function iconKey(namespace, name) { return namespace + ':' + name; } function isSafeUrlWithOptions(value) { return !!(value.url && value.options); } //# 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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} from '@angular/common';\nimport {HttpClient, HttpErrorResponse} from '@angular/common/http';\nimport {\n  ErrorHandler,\n  Inject,\n  Injectable,\n  InjectionToken,\n  Optional,\n  SecurityContext,\n  SkipSelf,\n  OnDestroy,\n} from '@angular/core';\nimport {DomSanitizer, SafeResourceUrl, SafeHtml} from '@angular/platform-browser';\nimport {forkJoin, Observable, of as observableOf, throwError as observableThrow} from 'rxjs';\nimport {catchError, finalize, map, share, tap} from 'rxjs/operators';\n\n\n/**\n * Returns an exception to be thrown in the case when attempting to\n * load an icon with a name that cannot be found.\n * @docs-private\n */\nexport function getMatIconNameNotFoundError(iconName: string): Error {\n  return Error(`Unable to find icon with the name \"${iconName}\"`);\n}\n\n\n/**\n * Returns an exception to be thrown when the consumer attempts to use\n * `<mat-icon>` without including @angular/common/http.\n * @docs-private\n */\nexport function getMatIconNoHttpProviderError(): Error {\n  return Error('Could not find HttpClient provider for use with Angular Material icons. ' +\n               'Please include the HttpClientModule from @angular/common/http in your ' +\n               'app imports.');\n}\n\n\n/**\n * Returns an exception to be thrown when a URL couldn't be sanitized.\n * @param url URL that was attempted to be sanitized.\n * @docs-private\n */\nexport function getMatIconFailedToSanitizeUrlError(url: SafeResourceUrl): Error {\n  return Error(`The URL provided to MatIconRegistry was not trusted as a resource URL ` +\n               `via Angular's DomSanitizer. Attempted URL was \"${url}\".`);\n}\n\n/**\n * Returns an exception to be thrown when a HTML string couldn't be sanitized.\n * @param literal HTML that was attempted to be sanitized.\n * @docs-private\n */\nexport function getMatIconFailedToSanitizeLiteralError(literal: SafeHtml): Error {\n  return Error(`The literal provided to MatIconRegistry was not trusted as safe HTML by ` +\n               `Angular's DomSanitizer. Attempted literal was \"${literal}\".`);\n}\n\n/** Options that can be used to configure how an icon or the icons in an icon set are presented. */\nexport interface IconOptions {\n  /** View box to set on the icon. */\n  viewBox?: string;\n\n  /** Whether or not to fetch the icon or icon set using HTTP credentials. */\n  withCredentials?: boolean;\n}\n\n/**\n * Function that will be invoked by the icon registry when trying to resolve the\n * URL from which to fetch an icon. 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Used for icon fonts. */\n  private _fontCssClassesByAlias = new Map<string, string>();\n\n  /** Registered icon resolver functions. */\n  private _resolvers: IconResolver[] = [];\n\n  /**\n   * The CSS class to apply when an `<mat-icon>` component has no icon name, url, or font specified.\n   * The default 'material-icons' value assumes that the material icon font has been loaded as\n   * described at http://google.github.io/material-design-icons/#icon-font-for-the-web\n   */\n  private _defaultFontSetClass = 'material-icons';\n\n  constructor(\n    @Optional() private _httpClient: HttpClient,\n    private _sanitizer: DomSanitizer,\n    @Optional() @Inject(DOCUMENT) document: any,\n    private readonly _errorHandler: ErrorHandler) {\n      this._document = document;\n    }\n\n  /**\n   * Registers an icon by URL in the default namespace.\n   * @param iconName Name under which the icon should be registered.\n   * @param url\n   */\n  addSvgIcon(iconName: string, url: SafeResourceUrl, options?: IconOptions): this {\n    return this.addSvgIconInNamespace('', iconName, url, options);\n  }\n\n  /**\n   * Registers an icon using an HTML string in the default namespace.\n   * @param iconName Name under which the icon should be registered.\n   * @param literal SVG source of the icon.\n   */\n  addSvgIconLiteral(iconName: string, literal: SafeHtml, options?: IconOptions): this {\n    return this.addSvgIconLiteralInNamespace('', iconName, literal, options);\n  }\n\n  /**\n   * Registers an icon by URL in the specified namespace.\n   * @param namespace Namespace in which the icon should be registered.\n   * @param iconName Name under which the icon should be registered.\n   * @param url\n   */\n  addSvgIconInNamespace(namespace: string, iconName: string, url: SafeResourceUrl,\n                        options?: IconOptions): this {\n    return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig(url, null, options));\n  }\n\n  /**\n   * Registers an icon resolver function with the registry. The function will be invoked with the\n   * name and namespace of an icon when the registry tries to resolve the URL from which to fetch\n   * the icon. The resolver is expected to return a `SafeResourceUrl` that points to the icon,\n   * an object with the icon URL and icon options, or `null` if the icon is not supported. Resolvers\n   * will be invoked in the order in which they have been registered.\n   * @param resolver Resolver function to be registered.\n   */\n  addSvgIconResolver(resolver: IconResolver): this {\n    this._resolvers.push(resolver);\n    return this;\n  }\n\n  /**\n   * Registers an icon using an HTML string in the specified namespace.\n   * @param namespace Namespace in which the icon should be registered.\n   * @param iconName Name under which the icon should be registered.\n   * @param literal SVG source of the icon.\n   */\n  addSvgIconLiteralInNamespace(namespace: string, iconName: string, literal: SafeHtml,\n                               options?: IconOptions): this {\n    const cleanLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal);\n\n    // TODO: add an ngDevMode check\n    if (!cleanLiteral) {\n      throw getMatIconFailedToSanitizeLiteralError(literal);\n    }\n\n    return this._addSvgIconConfig(namespace, iconName,\n        new SvgIconConfig('', cleanLiteral, options));\n  }\n\n  /**\n   * Registers an icon set by URL in the default namespace.\n   * @param url\n   */\n  addSvgIconSet(url: SafeResourceUrl, options?: IconOptions): this {\n    return this.addSvgIconSetInNamespace('', url, options);\n  }\n\n  /**\n   * Registers an icon set using an HTML string in the default namespace.\n   * @param literal SVG source of the icon set.\n   */\n  addSvgIconSetLiteral(literal: SafeHtml, options?: IconOptions): this {\n    return this.addSvgIconSetLiteralInNamespace('', literal, options);\n  }\n\n  /**\n   * Registers an icon set by URL in the specified namespace.\n   * @param namespace Namespace in which to register the icon set.\n   * @param url\n   */\n  addSvgIconSetInNamespace(namespace: string, url: SafeResourceUrl, options?: IconOptions): this {\n    return this._addSvgIconSetConfig(namespace, new SvgIconConfig(url, null, options));\n  }\n\n  /**\n   * Registers an icon set using an HTML string in the specified namespace.\n   * @param namespace Namespace in which to register the icon set.\n   * @param literal SVG source of the icon set.\n   */\n  addSvgIconSetLiteralInNamespace(namespace: string, literal: SafeHtml,\n                                  options?: IconOptions): this {\n    const cleanLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal);\n\n    if (!cleanLiteral) {\n      throw getMatIconFailedToSanitizeLiteralError(literal);\n    }\n\n    return this._addSvgIconSetConfig(namespace, new SvgIconConfig('', cleanLiteral, options));\n  }\n\n  /**\n   * Defines an alias for a CSS class name to be used for icon fonts. Creating an matIcon\n   * component with the alias as the fontSet input will cause the class name to be applied\n   * to the `<mat-icon>` element.\n   *\n   * @param alias Alias for the font.\n   * @param className Class name override to be used instead of the alias.\n   */\n  registerFontClassAlias(alias: string, className: string = alias): this {\n    this._fontCssClassesByAlias.set(alias, className);\n    return this;\n  }\n\n  /**\n   * Returns the CSS class name associated with the alias by a previous call to\n   * registerFontClassAlias. If no CSS class has been associated, returns the alias unmodified.\n   */\n  classNameForFontAlias(alias: string): string {\n    return this._fontCssClassesByAlias.get(alias) || alias;\n  }\n\n  /**\n   * Sets the CSS class name to be used for icon fonts when an `<mat-icon>` component does not\n   * have a fontSet input value, and is not loading an icon by name or URL.\n   *\n   * @param className\n   */\n  setDefaultFontSetClass(className: string): this {\n    this._defaultFontSetClass = className;\n    return this;\n  }\n\n  /**\n   * Returns the CSS class name to be used for icon fonts when an `<mat-icon>` component does not\n   * have a fontSet input value, and is not loading an icon by name or URL.\n   */\n  getDefaultFontSetClass(): string {\n    return this._defaultFontSetClass;\n  }\n\n  /**\n   * Returns an Observable that produces the icon (as an `<svg>` DOM element) from the given URL.\n   * The response from the URL may be cached so this will not always cause an HTTP request, but\n   * the produced element will always be a new copy of the originally fetched icon. (That is,\n   * it will not contain any modifications made to elements previously returned).\n   *\n   * @param safeUrl URL from which to fetch the SVG icon.\n   */\n  getSvgIconFromUrl(safeUrl: SafeResourceUrl): Observable<SVGElement> {\n    const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, safeUrl);\n\n    if (!url) {\n      throw getMatIconFailedToSanitizeUrlError(safeUrl);\n    }\n\n    const cachedIcon = this._cachedIconsByUrl.get(url);\n\n    if (cachedIcon) {\n      return observableOf(cloneSvg(cachedIcon));\n    }\n\n    return this._loadSvgIconFromConfig(new SvgIconConfig(safeUrl, null)).pipe(\n      tap(svg => this._cachedIconsByUrl.set(url!, svg)),\n      map(svg => cloneSvg(svg)),\n    );\n  }\n\n  /**\n   * Returns an Observable that produces the icon (as an `<svg>` DOM element) with the given name\n   * and namespace. The icon must have been previously registered with addIcon or addIconSet;\n   * if not, the Observable will throw an error.\n   *\n   * @param name Name of the icon to be retrieved.\n   * @param namespace Namespace in which to look for the icon.\n   */\n  getNamedSvgIcon(name: string, namespace: string = ''): Observable<SVGElement> {\n    const key = iconKey(namespace, name);\n    let config = this._svgIconConfigs.get(key);\n\n    // Return (copy of) cached icon if possible.\n    if (config) {\n      return this._getSvgFromConfig(config);\n    }\n\n    // Otherwise try to resolve the config from one of the resolver functions.\n    config = this._getIconConfigFromResolvers(namespace, name);\n\n    if (config) {\n      this._svgIconConfigs.set(key, config);\n      return this._getSvgFromConfig(config);\n    }\n\n    // See if we have any icon sets registered for the namespace.\n    const iconSetConfigs = this._iconSetConfigs.get(namespace);\n\n    if (iconSetConfigs) {\n      return this._getSvgFromIconSetConfigs(name, iconSetConfigs);\n    }\n\n    return observableThrow(getMatIconNameNotFoundError(key));\n  }\n\n  ngOnDestroy() {\n    this._resolvers = [];\n    this._svgIconConfigs.clear();\n    this._iconSetConfigs.clear();\n    this._cachedIconsByUrl.clear();\n  }\n\n  /**\n   * Returns the cached icon for a SvgIconConfig if available, or fetches it from its URL if not.\n   */\n  private _getSvgFromConfig(config: SvgIconConfig): Observable<SVGElement> {\n    if (config.svgText) {\n      // We already have the SVG element for this icon, return a copy.\n      return observableOf(cloneSvg(this._svgElementFromConfig(config as LoadedSvgIconConfig)));\n    } else {\n      // Fetch the icon from the config's URL, cache it, and return a copy.\n      return this._loadSvgIconFromConfig(config).pipe(map(svg => cloneSvg(svg)));\n    }\n  }\n\n  /**\n   * Attempts to find an icon with the specified name in any of the SVG icon sets.\n   * First searches the available cached icons for a nested element with a matching name, and\n   * if found copies the element to a new `<svg>` element. If not found, fetches all icon sets\n   * that have not been cached, and searches again after all fetches are completed.\n   * The returned Observable produces the SVG element if possible, and throws\n   * an error if no icon with the specified name can be found.\n   */\n  private _getSvgFromIconSetConfigs(name: string, iconSetConfigs: SvgIconConfig[]):\n      Observable<SVGElement> {\n    // For all the icon set SVG elements we've fetched, see if any contain an icon with the\n    // requested name.\n    const namedIcon = this._extractIconWithNameFromAnySet(name, iconSetConfigs);\n\n    if (namedIcon) {\n      // We could cache namedIcon in _svgIconConfigs, but since we have to make a copy every\n      // time anyway, there's probably not much advantage compared to just always extracting\n      // it from the icon set.\n      return observableOf(namedIcon);\n    }\n\n    // Not found in any cached icon sets. If there are icon sets with URLs that we haven't\n    // fetched, fetch them now and look for iconName in the results.\n    const iconSetFetchRequests: Observable<string | null>[] = iconSetConfigs\n      .filter(iconSetConfig => !iconSetConfig.svgText)\n      .map(iconSetConfig => {\n        return this._loadSvgIconSetFromConfig(iconSetConfig).pipe(\n          catchError((err: HttpErrorResponse) => {\n            const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, iconSetConfig.url);\n\n            // Swallow errors fetching individual URLs so the\n            // combined Observable won't necessarily fail.\n            const errorMessage = `Loading icon set URL: ${url} failed: ${err.message}`;\n            this._errorHandler.handleError(new Error(errorMessage));\n            return observableOf(null);\n          })\n        );\n      });\n\n    // Fetch all the icon set URLs. When the requests complete, every IconSet should have a\n    // cached SVG element (unless the request failed), and we can check again for the icon.\n    return forkJoin(iconSetFetchRequests).pipe(map(() => {\n      const foundIcon = this._extractIconWithNameFromAnySet(name, iconSetConfigs);\n\n      // TODO: add an ngDevMode check\n      if (!foundIcon) {\n        throw getMatIconNameNotFoundError(name);\n      }\n\n      return foundIcon;\n    }));\n  }\n\n  /**\n   * Searches the cached SVG elements for the given icon sets for a nested icon element whose \"id\"\n   * tag matches the specified name. If found, copies the nested element to a new SVG element and\n   * returns it. Returns null if no matching element is found.\n   */\n  private _extractIconWithNameFromAnySet(iconName: string, iconSetConfigs: SvgIconConfig[]):\n      SVGElement | null {\n    // Iterate backwards, so icon sets added later have precedence.\n    for (let i = iconSetConfigs.length - 1; i >= 0; i--) {\n      const config = iconSetConfigs[i];\n\n      // Parsing the icon set's text into an SVG element can be expensive. We can avoid some of\n      // the parsing by doing a quick check using `indexOf` to see if there's any chance for the\n      // icon to be in the set. This won't be 100% accurate, but it should help us avoid at least\n      // some of the parsing.\n      if (config.svgText && config.svgText.indexOf(iconName) > -1) {\n        const svg = this._svgElementFromConfig(config as LoadedSvgIconConfig);\n        const foundIcon = this._extractSvgIconFromSet(svg, iconName, config.options);\n        if (foundIcon) {\n          return foundIcon;\n        }\n      }\n    }\n    return null;\n  }\n\n  /**\n   * Loads the content of the icon URL specified in the SvgIconConfig and creates an SVG element\n   * from it.\n   */\n  private _loadSvgIconFromConfig(config: SvgIconConfig): Observable<SVGElement> {\n    return this._fetchIcon(config).pipe(\n      tap(svgText => config.svgText = svgText),\n      map(() => this._svgElementFromConfig(config as LoadedSvgIconConfig))\n    );\n  }\n\n  /**\n   * Loads the content of the icon set URL specified in the\n   * SvgIconConfig and attaches it to the config.\n   */\n  private _loadSvgIconSetFromConfig(config: SvgIconConfig): Observable<string | null> {\n    if (config.svgText) {\n      return observableOf(null);\n    }\n\n    return this._fetchIcon(config).pipe(tap(svgText => config.svgText = svgText));\n  }\n\n  /**\n   * Searches the cached element of the given SvgIconConfig for a nested icon element whose \"id\"\n   * tag matches the specified name. If found, copies the nested element to a new SVG element and\n   * returns it. Returns null if no matching element is found.\n   */\n  private _extractSvgIconFromSet(iconSet: SVGElement, iconName: string,\n                                 options?: IconOptions): SVGElement | null {\n    // Use the `id=\"iconName\"` syntax in order to escape special\n    // characters in the ID (versus using the #iconName syntax).\n    const iconSource = iconSet.querySelector(`[id=\"${iconName}\"]`);\n\n    if (!iconSource) {\n      return null;\n    }\n\n    // Clone the element and remove the ID to prevent multiple elements from being added\n    // to the page with the same ID.\n    const iconElement = iconSource.cloneNode(true) as Element;\n    iconElement.removeAttribute('id');\n\n    // If the icon node is itself an <svg> node, clone and return it directly. If not, set it as\n    // the content of a new <svg> node.\n    if (iconElement.nodeName.toLowerCase() === 'svg') {\n      return this._setSvgAttributes(iconElement as SVGElement, options);\n    }\n\n    // If the node is a <symbol>, it won't be rendered so we have to convert it into <svg>. Note\n    // that the same could be achieved by referring to it via <use href=\"#id\">, however the <use>\n    // tag is problematic on Firefox, because it needs to include the current page path.\n    if (iconElement.nodeName.toLowerCase() === 'symbol') {\n      return this._setSvgAttributes(this._toSvgElement(iconElement), options);\n    }\n\n    // createElement('SVG') doesn't work as expected; the DOM ends up with\n    // the correct nodes, but the SVG content doesn't render. Instead we\n    // have to create an empty SVG node using innerHTML and append its content.\n    // Elements created using DOMParser.parseFromString have the same problem.\n    // http://stackoverflow.com/questions/23003278/svg-innerhtml-in-firefox-can-not-display\n    const svg = this._svgElementFromString('<svg></svg>');\n    // Clone the node so we don't remove it from the parent icon set element.\n    svg.appendChild(iconElement);\n\n    return this._setSvgAttributes(svg, options);\n  }\n\n  /**\n   * Creates a DOM element from the given SVG string.\n   */\n  private _svgElementFromString(str: string): SVGElement {\n    const div = this._document.createElement('DIV');\n    div.innerHTML = str;\n    const svg = div.querySelector('svg') as SVGElement;\n\n    // TODO: add an ngDevMode check\n    if (!svg) {\n      throw Error('<svg> tag not found');\n    }\n\n    return svg;\n  }\n\n  /**\n   * Converts an element into an SVG node by cloning all of its children.\n   */\n  private _toSvgElement(element: Element): SVGElement {\n    const svg = this._svgElementFromString('<svg></svg>');\n    const attributes = element.attributes;\n\n    // Copy over all the attributes from the `symbol` to the new SVG, except the id.\n    for (let i = 0; i < attributes.length; i++) {\n      const {name, value} = attributes[i];\n\n      if (name !== 'id') {\n        svg.setAttribute(name, value);\n      }\n    }\n\n    for (let i = 0; i < element.childNodes.length; i++) {\n      if (element.childNodes[i].nodeType === this._document.ELEMENT_NODE) {\n        svg.appendChild(element.childNodes[i].cloneNode(true));\n      }\n    }\n\n    return svg;\n  }\n\n  /**\n   * Sets the default attributes for an SVG element to be used as an icon.\n   */\n  private _setSvgAttributes(svg: SVGElement, options?: IconOptions): SVGElement {\n    svg.setAttribute('fit', '');\n    svg.setAttribute('height', '100%');\n    svg.setAttribute('width', '100%');\n    svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');\n    svg.setAttribute('focusable', 'false'); // Disable IE11 default behavior to make SVGs focusable.\n\n    if (options && options.viewBox) {\n      svg.setAttribute('viewBox', options.viewBox);\n    }\n\n    return svg;\n  }\n\n  /**\n   * Returns an Observable which produces the string contents of the given icon. Results may be\n   * cached, so future calls with the same URL may not cause another HTTP request.\n   */\n  private _fetchIcon(iconConfig: SvgIconConfig): Observable<string> {\n    const {url: safeUrl, options} = iconConfig;\n    const withCredentials = options?.withCredentials ?? false;\n\n    if (!this._httpClient) {\n      throw getMatIconNoHttpProviderError();\n    }\n\n    // TODO: add an ngDevMode check\n    if (safeUrl == null) {\n      throw Error(`Cannot fetch icon from URL \"${safeUrl}\".`);\n    }\n\n    const url = this._sanitizer.sanitize(SecurityContext.RESOURCE_URL, safeUrl);\n\n    // TODO: add an ngDevMode check\n    if (!url) {\n      throw getMatIconFailedToSanitizeUrlError(safeUrl);\n    }\n\n    // Store in-progress fetches to avoid sending a duplicate request for a URL when there is\n    // already a request in progress for that URL. It's necessary to call share() on the\n    // Observable returned by http.get() so that multiple subscribers don't cause multiple XHRs.\n    const inProgressFetch = this._inProgressUrlFetches.get(url);\n\n    if (inProgressFetch) {\n      return inProgressFetch;\n    }\n\n    const req = this._httpClient.get(url, {responseType: 'text', withCredentials}).pipe(\n      finalize(() => this._inProgressUrlFetches.delete(url)),\n      share(),\n    );\n\n    this._inProgressUrlFetches.set(url, req);\n    return req;\n  }\n\n  /**\n   * Registers an icon config by name in the specified namespace.\n   * @param namespace Namespace in which to register the icon config.\n   * @param iconName Name under which to register the config.\n   * @param config Config to be registered.\n   */\n  private _addSvgIconConfig(namespace: string, iconName: string, config: SvgIconConfig): this {\n    this._svgIconConfigs.set(iconKey(namespace, iconName), config);\n    return this;\n  }\n\n  /**\n   * Registers an icon set config in the specified namespace.\n   * @param namespace Namespace in which to register the icon config.\n   * @param config Config to be registered.\n   */\n  private _addSvgIconSetConfig(namespace: string, config: SvgIconConfig): this {\n    const configNamespace = this._iconSetConfigs.get(namespace);\n\n    if (configNamespace) {\n      configNamespace.push(config);\n    } else {\n      this._iconSetConfigs.set(namespace, [config]);\n    }\n\n    return this;\n  }\n\n  /** Parses a config's text into an SVG element. */\n  private _svgElementFromConfig(config: LoadedSvgIconConfig): SVGElement {\n    if (!config.svgElement) {\n      const svg = this._svgElementFromString(config.svgText);\n      this._setSvgAttributes(svg, config.options);\n      config.svgElement = svg;\n    }\n\n    return config.svgElement;\n  }\n\n  /** Tries to create an icon config through the registered resolver functions. */\n  private _getIconConfigFromResolvers(namespace: string, name: string): SvgIconConfig | undefined {\n    for (let i = 0; i < this._resolvers.length; i++) {\n      const result = this._resolvers[i](name, namespace);\n\n      if (result) {\n        return isSafeUrlWithOptions(result) ?\n          new SvgIconConfig(result.url, null, result.options) :\n          new SvgIconConfig(result, null);\n      }\n    }\n\n    return undefined;\n  }\n}\n\n/** @docs-private */\nexport function ICON_REGISTRY_PROVIDER_FACTORY(\n  parentRegistry: MatIconRegistry,\n  httpClient: HttpClient,\n  sanitizer: DomSanitizer,\n  errorHandler: ErrorHandler,\n  document?: any) {\n  return parentRegistry || new MatIconRegistry(httpClient, sanitizer, document, errorHandler);\n}\n\n/** @docs-private */\nexport const ICON_REGISTRY_PROVIDER = {\n  // If there is already an MatIconRegistry available, use that. Otherwise, provide a new one.\n  provide: MatIconRegistry,\n  deps: [\n    [new Optional(), new SkipSelf(), MatIconRegistry],\n    [new Optional(), HttpClient],\n    DomSanitizer,\n    ErrorHandler,\n    [new Optional(), DOCUMENT as InjectionToken<any>],\n  ],\n  useFactory: ICON_REGISTRY_PROVIDER_FACTORY,\n};\n\n/** Clones an SVGElement while preserving type information. */\nfunction cloneSvg(svg: SVGElement): SVGElement {\n  return svg.cloneNode(true) as SVGElement;\n}\n\n/** Returns the cache key to use for an icon namespace and name. */\nfunction iconKey(namespace: string, name: string) {\n  return namespace + ':' + name;\n}\n\nfunction isSafeUrlWithOptions(value: any): value is SafeResourceUrlWithIconOptions {\n  return !!(value.url && value.options);\n}\n"]}