| {"version":3,"file":"icon.es5.js","sources":["../../../src/material/icon/icon-module.ts","../../../src/material/icon/icon.ts","../../../src/material/icon/icon-registry.ts"],"sourcesContent":["/**\n * @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 {NgModule} from '@angular/core';\nimport {MatCommonModule} from '@angular/material/core';\nimport {MatIcon} from './icon';\n\n\n@NgModule({\n imports: [MatCommonModule],\n exports: [MatIcon, MatCommonModule],\n declarations: [MatIcon],\n})\nexport class MatIconModule {}\n","/**\n * @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 {take} from 'rxjs/operators';\nimport {\n Attribute,\n ChangeDetectionStrategy,\n Component,\n ElementRef,\n Input,\n OnChanges,\n OnInit,\n SimpleChanges,\n ViewEncapsulation,\n Optional,\n InjectionToken,\n inject,\n Inject,\n OnDestroy,\n AfterViewChecked,\n} from '@angular/core';\nimport {DOCUMENT} from '@angular/common';\nimport {CanColor, CanColorCtor, mixinColor} from '@angular/material/core';\nimport {coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {MatIconRegistry} from './icon-registry';\n\n\n// Boilerplate for applying mixins to MatIcon.\n/** @docs-private */\nclass MatIconBase {\n constructor(public _elementRef: ElementRef) {}\n}\nconst _MatIconMixinBase: CanColorCtor & typeof MatIconBase = mixinColor(MatIconBase);\n\n/**\n * Injection token used to provide the current location to `MatIcon`.\n * Used to handle server-side rendering and to stub out during unit tests.\n * @docs-private\n */\nexport const MAT_ICON_LOCATION = new InjectionToken<MatIconLocation>('mat-icon-location', {\n providedIn: 'root',\n factory: MAT_ICON_LOCATION_FACTORY\n});\n\n/**\n * Stubbed out location for `MatIcon`.\n * @docs-private\n */\nexport interface MatIconLocation {\n getPathname: () => string;\n}\n\n/** @docs-private */\nexport function MAT_ICON_LOCATION_FACTORY(): MatIconLocation {\n const _document = inject(DOCUMENT);\n const _location = _document ? _document.location : null;\n\n return {\n // Note that this needs to be a function, rather than a property, because Angular\n // will only resolve it once, but we want the current path on each call.\n getPathname: () => _location ? (_location.pathname + _location.search) : ''\n };\n}\n\n\n/** SVG attributes that accept a FuncIRI (e.g. `url(<something>)`). */\nconst funcIriAttributes = [\n 'clip-path',\n 'color-profile',\n 'src',\n 'cursor',\n 'fill',\n 'filter',\n 'marker',\n 'marker-start',\n 'marker-mid',\n 'marker-end',\n 'mask',\n 'stroke'\n];\n\n/** Selector that can be used to find all elements that are using a `FuncIRI`. */\nconst funcIriAttributeSelector = funcIriAttributes.map(attr => `[${attr}]`).join(', ');\n\n/** Regex that can be used to extract the id out of a FuncIRI. */\nconst funcIriPattern = /^url\\(['\"]?#(.*?)['\"]?\\)$/;\n\n/**\n * Component to display an icon. It can be used in the following ways:\n *\n * - Specify the svgIcon input to load an SVG icon from a URL previously registered with the\n * addSvgIcon, addSvgIconInNamespace, addSvgIconSet, or addSvgIconSetInNamespace methods of\n * MatIconRegistry. If the svgIcon value contains a colon it is assumed to be in the format\n * \"[namespace]:[name]\", if not the value will be the name of an icon in the default namespace.\n * Examples:\n * `<mat-icon svgIcon=\"left-arrow\"></mat-icon>\n * <mat-icon svgIcon=\"animals:cat\"></mat-icon>`\n *\n * - Use a font ligature as an icon by putting the ligature text in the content of the `<mat-icon>`\n * component. By default the Material icons font is used as described at\n * http://google.github.io/material-design-icons/#icon-font-for-the-web. You can specify an\n * alternate font by setting the fontSet input to either the CSS class to apply to use the\n * desired font, or to an alias previously registered with MatIconRegistry.registerFontClassAlias.\n * Examples:\n * `<mat-icon>home</mat-icon>\n * <mat-icon fontSet=\"myfont\">sun</mat-icon>`\n *\n * - Specify a font glyph to be included via CSS rules by setting the fontSet input to specify the\n * font, and the fontIcon input to specify the icon. Typically the fontIcon will specify a\n * CSS class which causes the glyph to be displayed via a :before selector, as in\n * https://fortawesome.github.io/Font-Awesome/examples/\n * Example:\n * `<mat-icon fontSet=\"fa\" fontIcon=\"alarm\"></mat-icon>`\n */\n@Component({\n moduleId: module.id,\n template: '<ng-content></ng-content>',\n selector: 'mat-icon',\n exportAs: 'matIcon',\n styleUrls: ['icon.css'],\n inputs: ['color'],\n host: {\n 'role': 'img',\n 'class': 'mat-icon notranslate',\n '[class.mat-icon-inline]': 'inline',\n '[class.mat-icon-no-color]': 'color !== \"primary\" && color !== \"accent\" && color !== \"warn\"',\n },\n encapsulation: ViewEncapsulation.None,\n changeDetection: ChangeDetectionStrategy.OnPush,\n})\nexport class MatIcon extends _MatIconMixinBase implements OnChanges, OnInit, AfterViewChecked,\n CanColor, OnDestroy {\n\n /**\n * Whether the icon should be inlined, automatically sizing the icon to match the font size of\n * the element the icon is contained in.\n */\n @Input()\n get inline(): boolean {\n return this._inline;\n }\n set inline(inline: boolean) {\n this._inline = coerceBooleanProperty(inline);\n }\n private _inline: boolean = false;\n\n /** Name of the icon in the SVG icon set. */\n @Input() svgIcon: string;\n\n /** Font set that the icon is a part of. */\n @Input()\n get fontSet(): string { return this._fontSet; }\n set fontSet(value: string) {\n this._fontSet = this._cleanupFontValue(value);\n }\n private _fontSet: string;\n\n /** Name of an icon within a font set. */\n @Input()\n get fontIcon(): string { return this._fontIcon; }\n set fontIcon(value: string) {\n this._fontIcon = this._cleanupFontValue(value);\n }\n private _fontIcon: string;\n\n private _previousFontSetClass: string;\n private _previousFontIconClass: string;\n\n /** Keeps track of the current page path. */\n private _previousPath?: string;\n\n /** Keeps track of the elements and attributes that we've prefixed with the current path. */\n private _elementsWithExternalReferences?: Map<Element, {name: string, value: string}[]>;\n\n constructor(\n elementRef: ElementRef<HTMLElement>,\n private _iconRegistry: MatIconRegistry,\n @Attribute('aria-hidden') ariaHidden: string,\n /**\n * @deprecated `location` parameter to be made required.\n * @breaking-change 8.0.0\n */\n @Optional() @Inject(MAT_ICON_LOCATION) private _location?: MatIconLocation) {\n super(elementRef);\n\n // If the user has not explicitly set aria-hidden, mark the icon as hidden, as this is\n // the right thing to do for the majority of icon use-cases.\n if (!ariaHidden) {\n elementRef.nativeElement.setAttribute('aria-hidden', 'true');\n }\n }\n\n /**\n * Splits an svgIcon binding value into its icon set and icon name components.\n * Returns a 2-element array of [(icon set), (icon name)].\n * The separator for the two fields is ':'. If there is no separator, an empty\n * string is returned for the icon set and the entire value is returned for\n * the icon name. If the argument is falsy, returns an array of two empty strings.\n * Throws an error if the name contains two or more ':' separators.\n * Examples:\n * `'social:cake' -> ['social', 'cake']\n * 'penguin' -> ['', 'penguin']\n * null -> ['', '']\n * 'a:b:c' -> (throws Error)`\n */\n private _splitIconName(iconName: string): [string, string] {\n if (!iconName) {\n return ['', ''];\n }\n const parts = iconName.split(':');\n switch (parts.length) {\n case 1: return ['', parts[0]]; // Use default namespace.\n case 2: return <[string, string]>parts;\n default: throw Error(`Invalid icon name: \"${iconName}\"`);\n }\n }\n\n ngOnChanges(changes: SimpleChanges) {\n // Only update the inline SVG icon if the inputs changed, to avoid unnecessary DOM operations.\n const svgIconChanges = changes['svgIcon'];\n\n if (svgIconChanges) {\n if (this.svgIcon) {\n const [namespace, iconName] = this._splitIconName(this.svgIcon);\n\n this._iconRegistry.getNamedSvgIcon(iconName, namespace).pipe(take(1)).subscribe(\n svg => this._setSvgElement(svg),\n (err: Error) => console.log(`Error retrieving icon: ${err.message}`)\n );\n } else if (svgIconChanges.previousValue) {\n this._clearSvgElement();\n }\n }\n\n if (this._usingFontIcon()) {\n this._updateFontIconClasses();\n }\n }\n\n ngOnInit() {\n // Update font classes because ngOnChanges won't be called if none of the inputs are present,\n // e.g. <mat-icon>arrow</mat-icon> In this case we need to add a CSS class for the default font.\n if (this._usingFontIcon()) {\n this._updateFontIconClasses();\n }\n }\n\n ngAfterViewChecked() {\n const cachedElements = this._elementsWithExternalReferences;\n\n if (cachedElements && this._location && cachedElements.size) {\n const newPath = this._location.getPathname();\n\n // We need to check whether the URL has changed on each change detection since\n // the browser doesn't have an API that will let us react on link clicks and\n // we can't depend on the Angular router. The references need to be updated,\n // because while most browsers don't care whether the URL is correct after\n // the first render, Safari will break if the user navigates to a different\n // page and the SVG isn't re-rendered.\n if (newPath !== this._previousPath) {\n this._previousPath = newPath;\n this._prependPathToReferences(newPath);\n }\n }\n }\n\n ngOnDestroy() {\n if (this._elementsWithExternalReferences) {\n this._elementsWithExternalReferences.clear();\n }\n }\n\n private _usingFontIcon(): boolean {\n return !this.svgIcon;\n }\n\n private _setSvgElement(svg: SVGElement) {\n this._clearSvgElement();\n\n // Workaround for IE11 and Edge ignoring `style` tags inside dynamically-created SVGs.\n // See: https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10898469/\n // Do this before inserting the element into the DOM, in order to avoid a style recalculation.\n const styleTags = svg.querySelectorAll('style') as NodeListOf<HTMLStyleElement>;\n\n for (let i = 0; i < styleTags.length; i++) {\n styleTags[i].textContent += ' ';\n }\n\n // Note: we do this fix here, rather than the icon registry, because the\n // references have to point to the URL at the time that the icon was created.\n if (this._location) {\n const path = this._location.getPathname();\n this._previousPath = path;\n this._cacheChildrenWithExternalReferences(svg);\n this._prependPathToReferences(path);\n }\n\n this._elementRef.nativeElement.appendChild(svg);\n }\n\n private _clearSvgElement() {\n const layoutElement: HTMLElement = this._elementRef.nativeElement;\n let childCount = layoutElement.childNodes.length;\n\n if (this._elementsWithExternalReferences) {\n this._elementsWithExternalReferences.clear();\n }\n\n // Remove existing non-element child nodes and SVGs, and add the new SVG element. Note that\n // we can't use innerHTML, because IE will throw if the element has a data binding.\n while (childCount--) {\n const child = layoutElement.childNodes[childCount];\n\n // 1 corresponds to Node.ELEMENT_NODE. We remove all non-element nodes in order to get rid\n // of any loose text nodes, as well as any SVG elements in order to remove any old icons.\n if (child.nodeType !== 1 || child.nodeName.toLowerCase() === 'svg') {\n layoutElement.removeChild(child);\n }\n }\n }\n\n private _updateFontIconClasses() {\n if (!this._usingFontIcon()) {\n return;\n }\n\n const elem: HTMLElement = this._elementRef.nativeElement;\n const fontSetClass = this.fontSet ?\n this._iconRegistry.classNameForFontAlias(this.fontSet) :\n this._iconRegistry.getDefaultFontSetClass();\n\n if (fontSetClass != this._previousFontSetClass) {\n if (this._previousFontSetClass) {\n elem.classList.remove(this._previousFontSetClass);\n }\n if (fontSetClass) {\n elem.classList.add(fontSetClass);\n }\n this._previousFontSetClass = fontSetClass;\n }\n\n if (this.fontIcon != this._previousFontIconClass) {\n if (this._previousFontIconClass) {\n elem.classList.remove(this._previousFontIconClass);\n }\n if (this.fontIcon) {\n elem.classList.add(this.fontIcon);\n }\n this._previousFontIconClass = this.fontIcon;\n }\n }\n\n /**\n * Cleans up a value to be used as a fontIcon or fontSet.\n * Since the value ends up being assigned as a CSS class, we\n * have to trim the value and omit space-separated values.\n */\n private _cleanupFontValue(value: string) {\n return typeof value === 'string' ? value.trim().split(' ')[0] : value;\n }\n\n /**\n * Prepends the current path to all elements that have an attribute pointing to a `FuncIRI`\n * reference. This is required because WebKit browsers require references to be prefixed with\n * the current path, if the page has a `base` tag.\n */\n private _prependPathToReferences(path: string) {\n const elements = this._elementsWithExternalReferences;\n\n if (elements) {\n elements.forEach((attrs, element) => {\n attrs.forEach(attr => {\n element.setAttribute(attr.name, `url('${path}#${attr.value}')`);\n });\n });\n }\n }\n\n /**\n * Caches the children of an SVG element that have `url()`\n * references that we need to prefix with the current path.\n */\n private _cacheChildrenWithExternalReferences(element: SVGElement) {\n const elementsWithFuncIri = element.querySelectorAll(funcIriAttributeSelector);\n const elements = this._elementsWithExternalReferences =\n this._elementsWithExternalReferences || new Map();\n\n for (let i = 0; i < elementsWithFuncIri.length; i++) {\n funcIriAttributes.forEach(attr => {\n const elementWithReference = elementsWithFuncIri[i];\n const value = elementWithReference.getAttribute(attr);\n const match = value ? value.match(funcIriPattern) : null;\n\n if (match) {\n let attributes = elements.get(elementWithReference);\n\n if (!attributes) {\n attributes = [];\n elements.set(elementWithReference, attributes);\n }\n\n attributes!.push({name: attr, value: match[1]});\n }\n });\n }\n }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {HttpClient, HttpErrorResponse} from '@angular/common/http';\nimport {\n Inject,\n Injectable,\n InjectionToken,\n Optional,\n SecurityContext,\n SkipSelf,\n OnDestroy,\n} from '@angular/core';\nimport {DomSanitizer, SafeResourceUrl, SafeHtml} from '@angular/platform-browser';\nimport {forkJoin, Observable, of as observableOf, throwError as observableThrow} from 'rxjs';\nimport {catchError, finalize, map, share, tap} from 'rxjs/operators';\n\n\n/**\n * Returns an exception to be thrown in the case when attempting to\n * load an icon with a name that cannot be found.\n * @docs-private\n */\nexport function getMatIconNameNotFoundError(iconName: string): Error {\n return Error(`Unable to find icon with the name \"${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\n/**\n * Configuration for an icon, including the URL and possibly the cached SVG element.\n * @docs-private\n */\nclass SvgIconConfig {\n url: SafeResourceUrl | null;\n svgElement: SVGElement | null;\n\n constructor(url: SafeResourceUrl);\n constructor(svgElement: SVGElement);\n constructor(data: SafeResourceUrl | SVGElement) {\n // Note that we can't use `instanceof SVGElement` here,\n // because it'll break during server-side rendering.\n if (!!(data as any).nodeName) {\n this.svgElement = data as SVGElement;\n } else {\n this.url = data as SafeResourceUrl;\n }\n }\n}\n\n/**\n * Service to register and display icons used by the `<mat-icon>` component.\n * - Registers icon URLs by namespace and name.\n * - Registers icon set URLs by namespace.\n * - Registers aliases for CSS classes, for use with icon fonts.\n * - Loads icons from URLs and extracts individual icons from icon sets.\n */\n@Injectable({providedIn: 'root'})\nexport class MatIconRegistry implements OnDestroy {\n private _document: Document;\n\n /**\n * URLs and cached SVG elements for individual icons. Keys are of the format \"[namespace]:[icon]\".\n */\n private _svgIconConfigs = new Map<string, SvgIconConfig>();\n\n /**\n * SvgIconConfig objects and cached SVG elements for icon sets, keyed by namespace.\n * Multiple icon sets can be registered under the same namespace.\n */\n private _iconSetConfigs = new Map<string, SvgIconConfig[]>();\n\n /** Cache for icons loaded by direct URLs. */\n private _cachedIconsByUrl = new Map<string, SVGElement>();\n\n /** In-progress icon fetches. Used to coalesce multiple requests to the same URL. */\n private _inProgressUrlFetches = new Map<string, Observable<string>>();\n\n /** Map from font identifiers to their CSS class names. Used for icon fonts. */\n private _fontCssClassesByAlias = new Map<string, string>();\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 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): this {\n return this.addSvgIconInNamespace('', iconName, url);\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): this {\n return this.addSvgIconLiteralInNamespace('', iconName, literal);\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): this {\n return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig(url));\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): this {\n const sanitizedLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal);\n\n if (!sanitizedLiteral) {\n throw getMatIconFailedToSanitizeLiteralError(literal);\n }\n\n const svgElement = this._createSvgElementForSingleIcon(sanitizedLiteral);\n return this._addSvgIconConfig(namespace, iconName, new SvgIconConfig(svgElement));\n }\n\n /**\n * Registers an icon set by URL in the default namespace.\n * @param url\n */\n addSvgIconSet(url: SafeResourceUrl): this {\n return this.addSvgIconSetInNamespace('', url);\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): this {\n return this.addSvgIconSetLiteralInNamespace('', literal);\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): this {\n return this._addSvgIconSetConfig(namespace, new SvgIconConfig(url));\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): this {\n const sanitizedLiteral = this._sanitizer.sanitize(SecurityContext.HTML, literal);\n\n if (!sanitizedLiteral) {\n throw getMatIconFailedToSanitizeLiteralError(literal);\n }\n\n const svgElement = this._svgElementFromString(sanitizedLiteral);\n return this._addSvgIconSetConfig(namespace, new SvgIconConfig(svgElement));\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)).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 // Return (copy of) cached icon if possible.\n const key = iconKey(namespace, name);\n const config = this._svgIconConfigs.get(key);\n\n if (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._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.svgElement) {\n // We already have the SVG element for this icon, return a copy.\n return observableOf(cloneSvg(config.svgElement));\n } else {\n // Fetch the icon from the config's URL, cache it, and return a copy.\n return this._loadSvgIconFromConfig(config).pipe(\n tap(svg => config.svgElement = svg),\n map(svg => cloneSvg(svg)),\n );\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<SVGElement | null>[] = iconSetConfigs\n .filter(iconSetConfig => !iconSetConfig.svgElement)\n .map(iconSetConfig => {\n return this._loadSvgIconSetFromConfig(iconSetConfig).pipe(\n catchError((err: HttpErrorResponse): Observable<SVGElement | null> => {\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 console.error(`Loading icon set URL: ${url} failed: ${err.message}`);\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 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 if (config.svgElement) {\n const foundIcon = this._extractSvgIconFromSet(config.svgElement, iconName);\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._fetchUrl(config.url)\n .pipe(map(svgText => this._createSvgElementForSingleIcon(svgText)));\n }\n\n /**\n * Loads the content of the icon set URL specified in the SvgIconConfig and creates an SVG element\n * from it.\n */\n private _loadSvgIconSetFromConfig(config: SvgIconConfig): Observable<SVGElement> {\n // If the SVG for this icon set has already been parsed, do nothing.\n if (config.svgElement) {\n return observableOf(config.svgElement);\n }\n\n return this._fetchUrl(config.url).pipe(map(svgText => {\n // It is possible that the icon set was parsed and cached by an earlier request, so parsing\n // only needs to occur if the cache is yet unset.\n if (!config.svgElement) {\n config.svgElement = this._svgElementFromString(svgText);\n }\n\n return config.svgElement;\n }));\n }\n\n /**\n * Creates a DOM element from the given SVG string, and adds default attributes.\n */\n private _createSvgElementForSingleIcon(responseText: string): SVGElement {\n const svg = this._svgElementFromString(responseText);\n this._setSvgAttributes(svg);\n return svg;\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): 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);\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));\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. 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Results may be\n * cached, so future calls with the same URL may not cause another HTTP request.\n */\n private _fetchUrl(safeUrl: SafeResourceUrl | null): Observable<string> {\n if (!this._httpClient) {\n throw getMatIconNoHttpProviderError();\n }\n\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 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 // TODO(jelbourn): for some reason, the `finalize` operator \"loses\" the generic type on the\n // Observable. Figure out why and fix it.\n const req = this._httpClient.get(url, {responseType: 'text'}).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\n/** @docs-private */\nexport function ICON_REGISTRY_PROVIDER_FACTORY(\n parentRegistry: MatIconRegistry,\n httpClient: HttpClient,\n sanitizer: DomSanitizer,\n document?: any) {\n return parentRegistry || new MatIconRegistry(httpClient, sanitizer, document);\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 [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 + ':' + 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