Kargi-Sitesi/node_modules/@angular/common/esm2022/src/directives/ng_if.mjs

/**
 * @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.dev/license
 */
import { Directive, Input, TemplateRef, ViewContainerRef, ɵstringify as stringify, } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * A structural directive that conditionally includes a template based on the value of
 * an expression coerced to Boolean.
 * When the expression evaluates to true, Angular renders the template
 * provided in a `then` clause, and when  false or null,
 * Angular renders the template provided in an optional `else` clause. The default
 * template for the `else` clause is blank.
 *
 * A [shorthand form](guide/directives/structural-directives#asterisk) of the directive,
 * `*ngIf="condition"`, is generally used, provided
 * as an attribute of the anchor element for the inserted template.
 * Angular expands this into a more explicit version, in which the anchor element
 * is contained in an `<ng-template>` element.
 *
 * Simple form with shorthand syntax:
 *
 * ```
 * <div *ngIf="condition">Content to render when condition is true.</div>
 * ```
 *
 * Simple form with expanded syntax:
 *
 * ```
 * <ng-template [ngIf]="condition"><div>Content to render when condition is
 * true.</div></ng-template>
 * ```
 *
 * Form with an "else" block:
 *
 * ```
 * <div *ngIf="condition; else elseBlock">Content to render when condition is true.</div>
 * <ng-template #elseBlock>Content to render when condition is false.</ng-template>
 * ```
 *
 * Shorthand form with "then" and "else" blocks:
 *
 * ```
 * <div *ngIf="condition; then thenBlock else elseBlock"></div>
 * <ng-template #thenBlock>Content to render when condition is true.</ng-template>
 * <ng-template #elseBlock>Content to render when condition is false.</ng-template>
 * ```
 *
 * Form with storing the value locally:
 *
 * ```
 * <div *ngIf="condition as value; else elseBlock">{{value}}</div>
 * <ng-template #elseBlock>Content to render when value is null.</ng-template>
 * ```
 *
 * @usageNotes
 *
 * The `*ngIf` directive is most commonly used to conditionally show an inline template,
 * as seen in the following  example.
 * The default `else` template is blank.
 *
 * {@example common/ngIf/ts/module.ts region='NgIfSimple'}
 *
 * ### Showing an alternative template using `else`
 *
 * To display a template when `expression` evaluates to false, use an `else` template
 * binding as shown in the following example.
 * The `else` binding points to an `<ng-template>`  element labeled `#elseBlock`.
 * The template can be defined anywhere in the component view, but is typically placed right after
 * `ngIf` for readability.
 *
 * {@example common/ngIf/ts/module.ts region='NgIfElse'}
 *
 * ### Using an external `then` template
 *
 * In the previous example, the then-clause template is specified inline, as the content of the
 * tag that contains the `ngIf` directive. You can also specify a template that is defined
 * externally, by referencing a labeled `<ng-template>` element. When you do this, you can
 * change which template to use at runtime, as shown in the following example.
 *
 * {@example common/ngIf/ts/module.ts region='NgIfThenElse'}
 *
 * ### Storing a conditional result in a variable
 *
 * You might want to show a set of properties from the same object. If you are waiting
 * for asynchronous data, the object can be undefined.
 * In this case, you can use `ngIf` and store the result of the condition in a local
 * variable as shown in the following example.
 *
 * {@example common/ngIf/ts/module.ts region='NgIfAs'}
 *
 * This code uses only one `AsyncPipe`, so only one subscription is created.
 * The conditional statement stores the result of `userStream|async` in the local variable `user`.
 * You can then bind the local `user` repeatedly.
 *
 * The conditional displays the data only if `userStream` returns a value,
 * so you don't need to use the
 * safe-navigation-operator (`?.`)
 * to guard against null values when accessing properties.
 * You can display an alternative template while waiting for the data.
 *
 * ### Shorthand syntax
 *
 * The shorthand syntax `*ngIf` expands into two separate template specifications
 * for the "then" and "else" clauses. For example, consider the following shorthand statement,
 * that is meant to show a loading page while waiting for data to be loaded.
 *
 * ```
 * <div class="hero-list" *ngIf="heroes else loading">
 *  ...
 * </div>
 *
 * <ng-template #loading>
 *  <div>Loading...</div>
 * </ng-template>
 * ```
 *
 * You can see that the "else" clause references the `<ng-template>`
 * with the `#loading` label, and the template for the "then" clause
 * is provided as the content of the anchor element.
 *
 * However, when Angular expands the shorthand syntax, it creates
 * another `<ng-template>` tag, with `ngIf` and `ngIfElse` directives.
 * The anchor element containing the template for the "then" clause becomes
 * the content of this unlabeled `<ng-template>` tag.
 *
 * ```
 * <ng-template [ngIf]="heroes" [ngIfElse]="loading">
 *  <div class="hero-list">
 *   ...
 *  </div>
 * </ng-template>
 *
 * <ng-template #loading>
 *  <div>Loading...</div>
 * </ng-template>
 * ```
 *
 * The presence of the implicit template object has implications for the nesting of
 * structural directives. For more on this subject, see
 * [Structural Directives](guide/directives/structural-directives#one-per-element).
 *
 * @ngModule CommonModule
 * @publicApi
 */
export class NgIf {
    constructor(_viewContainer, templateRef) {
        this._viewContainer = _viewContainer;
        this._context = new NgIfContext();
        this._thenTemplateRef = null;
        this._elseTemplateRef = null;
        this._thenViewRef = null;
        this._elseViewRef = null;
        this._thenTemplateRef = templateRef;
    }
    /**
     * The Boolean expression to evaluate as the condition for showing a template.
     */
    set ngIf(condition) {
        this._context.$implicit = this._context.ngIf = condition;
        this._updateView();
    }
    /**
     * A template to show if the condition expression evaluates to true.
     */
    set ngIfThen(templateRef) {
        assertTemplate('ngIfThen', templateRef);
        this._thenTemplateRef = templateRef;
        this._thenViewRef = null; // clear previous view if any.
        this._updateView();
    }
    /**
     * A template to show if the condition expression evaluates to false.
     */
    set ngIfElse(templateRef) {
        assertTemplate('ngIfElse', templateRef);
        this._elseTemplateRef = templateRef;
        this._elseViewRef = null; // clear previous view if any.
        this._updateView();
    }
    _updateView() {
        if (this._context.$implicit) {
            if (!this._thenViewRef) {
                this._viewContainer.clear();
                this._elseViewRef = null;
                if (this._thenTemplateRef) {
                    this._thenViewRef = this._viewContainer.createEmbeddedView(this._thenTemplateRef, this._context);
                }
            }
        }
        else {
            if (!this._elseViewRef) {
                this._viewContainer.clear();
                this._thenViewRef = null;
                if (this._elseTemplateRef) {
                    this._elseViewRef = this._viewContainer.createEmbeddedView(this._elseTemplateRef, this._context);
                }
            }
        }
    }
    /**
     * Asserts the correct type of the context for the template that `NgIf` will render.
     *
     * The presence of this method is a signal to the Ivy template type-check compiler that the
     * `NgIf` structural directive renders its template with a specific context type.
     */
    static ngTemplateContextGuard(dir, ctx) {
        return true;
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.10", ngImport: i0, type: NgIf, deps: [{ token: i0.ViewContainerRef }, { token: i0.TemplateRef }], target: i0.ɵɵFactoryTarget.Directive }); }
    static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.10", type: NgIf, isStandalone: true, selector: "[ngIf]", inputs: { ngIf: "ngIf", ngIfThen: "ngIfThen", ngIfElse: "ngIfElse" }, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.10", ngImport: i0, type: NgIf, decorators: [{
            type: Directive,
            args: [{
                    selector: '[ngIf]',
                    standalone: true,
                }]
        }], ctorParameters: () => [{ type: i0.ViewContainerRef }, { type: i0.TemplateRef }], propDecorators: { ngIf: [{
                type: Input
            }], ngIfThen: [{
                type: Input
            }], ngIfElse: [{
                type: Input
            }] } });
/**
 * @publicApi
 */
export class NgIfContext {
    constructor() {
        this.$implicit = null;
        this.ngIf = null;
    }
}
function assertTemplate(property, templateRef) {
    const isTemplateRefOrNull = !!(!templateRef || templateRef.createEmbeddedView);
    if (!isTemplateRefOrNull) {
        throw new Error(`${property} must be a TemplateRef, but received '${stringify(templateRef)}'.`);
    }
}
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The default\n * template for the `else` clause is blank.\n *\n * A [shorthand form](guide/directives/structural-directives#asterisk) of the directive,\n * `*ngIf=\"condition\"`, is generally used, provided\n * as an attribute of the anchor element for the inserted template.\n * Angular expands this into a more explicit version, in which the anchor element\n * is contained in an `<ng-template>` element.\n *\n * Simple form with shorthand syntax:\n *\n * ```\n * <div *ngIf=\"condition\">Content to render when condition is true.</div>\n * ```\n *\n * Simple form with expanded syntax:\n *\n * ```\n * <ng-template [ngIf]=\"condition\"><div>Content to render when condition is\n * true.</div></ng-template>\n * ```\n *\n * Form with an \"else\" block:\n *\n * ```\n * <div *ngIf=\"condition; else elseBlock\">Content to render when condition is true.</div>\n * <ng-template #elseBlock>Content to render when condition is false.</ng-template>\n * ```\n *\n * Shorthand form with \"then\" and \"else\" blocks:\n *\n * ```\n * <div *ngIf=\"condition; then thenBlock else elseBlock\"></div>\n * <ng-template #thenBlock>Content to render when condition is true.</ng-template>\n * <ng-template #elseBlock>Content to render when condition is false.</ng-template>\n * ```\n *\n * Form with storing the value locally:\n *\n * ```\n * <div *ngIf=\"condition as value; else elseBlock\">{{value}}</div>\n * <ng-template #elseBlock>Content to render when value is null.</ng-template>\n * ```\n *\n * @usageNotes\n *\n * The `*ngIf` directive is most commonly used to conditionally show an inline template,\n * as seen in the following  example.\n * The default `else` template is blank.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfSimple'}\n *\n * ### Showing an alternative template using `else`\n *\n * To display a template when `expression` evaluates to false, use an `else` template\n * binding as shown in the following example.\n * The `else` binding points to an `<ng-template>`  element labeled `#elseBlock`.\n * The template can be defined anywhere in the component view, but is typically placed right after\n * `ngIf` for readability.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfElse'}\n *\n * ### Using an external `then` template\n *\n * In the previous example, the then-clause template is specified inline, as the content of the\n * tag that contains the `ngIf` directive. You can also specify a template that is defined\n * externally, by referencing a labeled `<ng-template>` element. When you do this, you can\n * change which template to use at runtime, as shown in the following example.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfThenElse'}\n *\n * ### Storing a conditional result in a variable\n *\n * You might want to show a set of properties from the same object. If you are waiting\n * for asynchronous data, the object can be undefined.\n * In this case, you can use `ngIf` and store the result of the condition in a local\n * variable as shown in the following example.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfAs'}\n *\n * This code uses only one `AsyncPipe`, so only one subscription is created.\n * The conditional statement stores the result of `userStream|async` in the local variable `user`.\n * You can then bind the local `user` repeatedly.\n *\n * The conditional displays the data only if `userStream` returns a value,\n * so you don't need to use the\n * safe-navigation-operator (`?.`)\n * to guard against null values when accessing properties.\n * You can display an alternative template while waiting for the data.\n *\n * ### Shorthand syntax\n *\n * The shorthand syntax `*ngIf` expands into two separate template specifications\n * for the \"then\" and \"else\" clauses. For example, consider the following shorthand statement,\n * that is meant to show a loading page while waiting for data to be loaded.\n *\n * ```\n * <div class=\"hero-list\" *ngIf=\"heroes else loading\">\n *  ...\n * </div>\n *\n * <ng-template #loading>\n *  <div>Loading...</div>\n * </ng-template>\n * ```\n *\n * You can see that the \"else\" clause references the `<ng-template>`\n * with the `#loading` label, and the template for the \"then\" clause\n * is provided as the content of the anchor element.\n *\n * However, when Angular expands the shorthand syntax, it creates\n * another `<ng-template>` tag, with `ngIf` and `ngIfElse` directives.\n * The anchor element containing the template for the \"then\" clause becomes\n * the content of this unlabeled `<ng-template>` tag.\n *\n * ```\n * <ng-template [ngIf]=\"heroes\" [ngIfElse]=\"loading\">\n *  <div class=\"hero-list\">\n *   ...\n *  </div>\n * </ng-template>\n *\n * <ng-template #loading>\n *  <div>Loading...</div>\n * </ng-template>\n * ```\n *\n * The presence of the implicit template object has implications for the nesting of\n * structural directives. For more on this subject, see\n * [Structural Directives](guide/directives/structural-directives#one-per-element).\n *\n * @ngModule CommonModule\n * @publicApi\n */\n@Directive({\n  selector: '[ngIf]',\n  standalone: true,\n})\nexport class NgIf<T = unknown> {\n  private _context: NgIfContext<T> = new NgIfContext<T>();\n  private _thenTemplateRef: TemplateRef<NgIfContext<T>> | null = null;\n  private _elseTemplateRef: TemplateRef<NgIfContext<T>> | null = null;\n  private _thenViewRef: EmbeddedViewRef<NgIfContext<T>> | null = null;\n  private _elseViewRef: EmbeddedViewRef<NgIfContext<T>> | null = null;\n\n  constructor(\n    private _viewContainer: ViewContainerRef,\n    templateRef: TemplateRef<NgIfContext<T>>,\n  ) {\n    this._thenTemplateRef = templateRef;\n  }\n\n  /**\n   * The Boolean expression to evaluate as the condition for showing a template.\n   */\n  @Input()\n  set ngIf(condition: T) {\n    this._context.$implicit = this._context.ngIf = condition;\n    this._updateView();\n  }\n\n  /**\n   * A template to show if the condition expression evaluates to true.\n   */\n  @Input()\n  set ngIfThen(templateRef: TemplateRef<NgIfContext<T>> | null) {\n    assertTemplate('ngIfThen', templateRef);\n    this._thenTemplateRef = templateRef;\n    this._thenViewRef = null; // clear previous view if any.\n    this._updateView();\n  }\n\n  /**\n   * A template to show if the condition expression evaluates to false.\n   */\n  @Input()\n  set ngIfElse(templateRef: TemplateRef<NgIfContext<T>> | null) {\n    assertTemplate('ngIfElse', templateRef);\n    this._elseTemplateRef = templateRef;\n    this._elseViewRef = null; // clear previous view if any.\n    this._updateView();\n  }\n\n  private _updateView() {\n    if (this._context.$implicit) {\n      if (!this._thenViewRef) {\n        this._viewContainer.clear();\n        this._elseViewRef = null;\n        if (this._thenTemplateRef) {\n          this._thenViewRef = this._viewContainer.createEmbeddedView(\n            this._thenTemplateRef,\n            this._context,\n          );\n        }\n      }\n    } else {\n      if (!this._elseViewRef) {\n        this._viewContainer.clear();\n        this._thenViewRef = null;\n        if (this._elseTemplateRef) {\n          this._elseViewRef = this._viewContainer.createEmbeddedView(\n            this._elseTemplateRef,\n            this._context,\n          );\n        }\n      }\n    }\n  }\n\n  /** @internal */\n  public static ngIfUseIfTypeGuard: void;\n\n  /**\n   * Assert the correct type of the expression bound to the `ngIf` input within the template.\n   *\n   * The presence of this static field is a signal to the Ivy template type check compiler that\n   * when the `NgIf` structural directive renders its template, the type of the expression bound\n   * to `ngIf` should be narrowed in some way. For `NgIf`, the binding expression itself is used to\n   * narrow its type, which allows the strictNullChecks feature of TypeScript to work with `NgIf`.\n   */\n  static ngTemplateGuard_ngIf: 'binding';\n\n  /**\n   * Asserts the correct type of the context for the template that `NgIf` will render.\n   *\n   * The presence of this method is a signal to the Ivy template type-check compiler that the\n   * `NgIf` structural directive renders its template with a specific context type.\n   */\n  static ngTemplateContextGuard<T>(\n    dir: NgIf<T>,\n    ctx: any,\n  ): ctx is NgIfContext<Exclude<T, false | 0 | '' | null | undefined>> {\n    return true;\n  }\n}\n\n/**\n * @publicApi\n */\nexport class NgIfContext<T = unknown> {\n  public $implicit: T = null!;\n  public ngIf: T = null!;\n}\n\nfunction assertTemplate(property: string, templateRef: TemplateRef<any> | null): void {\n  const isTemplateRefOrNull = !!(!templateRef || templateRef.createEmbeddedView);\n  if (!isTemplateRefOrNull) {\n    throw new Error(`${property} must be a TemplateRef, but received '${stringify(templateRef)}'.`);\n  }\n}\n"]}