source: trip-planner-front/node_modules/@angular/common/esm2015/src/directives/ng_switch.js@ 6a3a178

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { Directive, Host, Input, Optional, TemplateRef, ViewContainerRef, ɵRuntimeError as RuntimeError } from '@angular/core';
9export class SwitchView {
10 constructor(_viewContainerRef, _templateRef) {
11 this._viewContainerRef = _viewContainerRef;
12 this._templateRef = _templateRef;
13 this._created = false;
14 }
15 create() {
16 this._created = true;
17 this._viewContainerRef.createEmbeddedView(this._templateRef);
18 }
19 destroy() {
20 this._created = false;
21 this._viewContainerRef.clear();
22 }
23 enforceState(created) {
24 if (created && !this._created) {
25 this.create();
26 }
27 else if (!created && this._created) {
28 this.destroy();
29 }
30 }
31}
32/**
33 * @ngModule CommonModule
34 *
35 * @description
36 * The `[ngSwitch]` directive on a container specifies an expression to match against.
37 * The expressions to match are provided by `ngSwitchCase` directives on views within the container.
38 * - Every view that matches is rendered.
39 * - If there are no matches, a view with the `ngSwitchDefault` directive is rendered.
40 * - Elements within the `[NgSwitch]` statement but outside of any `NgSwitchCase`
41 * or `ngSwitchDefault` directive are preserved at the location.
42 *
43 * @usageNotes
44 * Define a container element for the directive, and specify the switch expression
45 * to match against as an attribute:
46 *
47 * ```
48 * <container-element [ngSwitch]="switch_expression">
49 * ```
50 *
51 * Within the container, `*ngSwitchCase` statements specify the match expressions
52 * as attributes. Include `*ngSwitchDefault` as the final case.
53 *
54 * ```
55 * <container-element [ngSwitch]="switch_expression">
56 * <some-element *ngSwitchCase="match_expression_1">...</some-element>
57 * ...
58 * <some-element *ngSwitchDefault>...</some-element>
59 * </container-element>
60 * ```
61 *
62 * ### Usage Examples
63 *
64 * The following example shows how to use more than one case to display the same view:
65 *
66 * ```
67 * <container-element [ngSwitch]="switch_expression">
68 * <!-- the same view can be shown in more than one case -->
69 * <some-element *ngSwitchCase="match_expression_1">...</some-element>
70 * <some-element *ngSwitchCase="match_expression_2">...</some-element>
71 * <some-other-element *ngSwitchCase="match_expression_3">...</some-other-element>
72 * <!--default case when there are no matches -->
73 * <some-element *ngSwitchDefault>...</some-element>
74 * </container-element>
75 * ```
76 *
77 * The following example shows how cases can be nested:
78 * ```
79 * <container-element [ngSwitch]="switch_expression">
80 * <some-element *ngSwitchCase="match_expression_1">...</some-element>
81 * <some-element *ngSwitchCase="match_expression_2">...</some-element>
82 * <some-other-element *ngSwitchCase="match_expression_3">...</some-other-element>
83 * <ng-container *ngSwitchCase="match_expression_3">
84 * <!-- use a ng-container to group multiple root nodes -->
85 * <inner-element></inner-element>
86 * <inner-other-element></inner-other-element>
87 * </ng-container>
88 * <some-element *ngSwitchDefault>...</some-element>
89 * </container-element>
90 * ```
91 *
92 * @publicApi
93 * @see `NgSwitchCase`
94 * @see `NgSwitchDefault`
95 * @see [Structural Directives](guide/structural-directives)
96 *
97 */
98export class NgSwitch {
99 constructor() {
100 this._defaultUsed = false;
101 this._caseCount = 0;
102 this._lastCaseCheckIndex = 0;
103 this._lastCasesMatched = false;
104 }
105 set ngSwitch(newValue) {
106 this._ngSwitch = newValue;
107 if (this._caseCount === 0) {
108 this._updateDefaultCases(true);
109 }
110 }
111 /** @internal */
112 _addCase() {
113 return this._caseCount++;
114 }
115 /** @internal */
116 _addDefault(view) {
117 if (!this._defaultViews) {
118 this._defaultViews = [];
119 }
120 this._defaultViews.push(view);
121 }
122 /** @internal */
123 _matchCase(value) {
124 const matched = value == this._ngSwitch;
125 this._lastCasesMatched = this._lastCasesMatched || matched;
126 this._lastCaseCheckIndex++;
127 if (this._lastCaseCheckIndex === this._caseCount) {
128 this._updateDefaultCases(!this._lastCasesMatched);
129 this._lastCaseCheckIndex = 0;
130 this._lastCasesMatched = false;
131 }
132 return matched;
133 }
134 _updateDefaultCases(useDefault) {
135 if (this._defaultViews && useDefault !== this._defaultUsed) {
136 this._defaultUsed = useDefault;
137 for (let i = 0; i < this._defaultViews.length; i++) {
138 const defaultView = this._defaultViews[i];
139 defaultView.enforceState(useDefault);
140 }
141 }
142 }
143}
144NgSwitch.decorators = [
145 { type: Directive, args: [{ selector: '[ngSwitch]' },] }
146];
147NgSwitch.propDecorators = {
148 ngSwitch: [{ type: Input }]
149};
150/**
151 * @ngModule CommonModule
152 *
153 * @description
154 * Provides a switch case expression to match against an enclosing `ngSwitch` expression.
155 * When the expressions match, the given `NgSwitchCase` template is rendered.
156 * If multiple match expressions match the switch expression value, all of them are displayed.
157 *
158 * @usageNotes
159 *
160 * Within a switch container, `*ngSwitchCase` statements specify the match expressions
161 * as attributes. Include `*ngSwitchDefault` as the final case.
162 *
163 * ```
164 * <container-element [ngSwitch]="switch_expression">
165 * <some-element *ngSwitchCase="match_expression_1">...</some-element>
166 * ...
167 * <some-element *ngSwitchDefault>...</some-element>
168 * </container-element>
169 * ```
170 *
171 * Each switch-case statement contains an in-line HTML template or template reference
172 * that defines the subtree to be selected if the value of the match expression
173 * matches the value of the switch expression.
174 *
175 * Unlike JavaScript, which uses strict equality, Angular uses loose equality.
176 * This means that the empty string, `""` matches 0.
177 *
178 * @publicApi
179 * @see `NgSwitch`
180 * @see `NgSwitchDefault`
181 *
182 */
183export class NgSwitchCase {
184 constructor(viewContainer, templateRef, ngSwitch) {
185 this.ngSwitch = ngSwitch;
186 if ((typeof ngDevMode === 'undefined' || ngDevMode) && !ngSwitch) {
187 throwNgSwitchProviderNotFoundError('ngSwitchCase', 'NgSwitchCase');
188 }
189 ngSwitch._addCase();
190 this._view = new SwitchView(viewContainer, templateRef);
191 }
192 /**
193 * Performs case matching. For internal use only.
194 */
195 ngDoCheck() {
196 this._view.enforceState(this.ngSwitch._matchCase(this.ngSwitchCase));
197 }
198}
199NgSwitchCase.decorators = [
200 { type: Directive, args: [{ selector: '[ngSwitchCase]' },] }
201];
202NgSwitchCase.ctorParameters = () => [
203 { type: ViewContainerRef },
204 { type: TemplateRef },
205 { type: NgSwitch, decorators: [{ type: Optional }, { type: Host }] }
206];
207NgSwitchCase.propDecorators = {
208 ngSwitchCase: [{ type: Input }]
209};
210/**
211 * @ngModule CommonModule
212 *
213 * @description
214 *
215 * Creates a view that is rendered when no `NgSwitchCase` expressions
216 * match the `NgSwitch` expression.
217 * This statement should be the final case in an `NgSwitch`.
218 *
219 * @publicApi
220 * @see `NgSwitch`
221 * @see `NgSwitchCase`
222 *
223 */
224export class NgSwitchDefault {
225 constructor(viewContainer, templateRef, ngSwitch) {
226 if ((typeof ngDevMode === 'undefined' || ngDevMode) && !ngSwitch) {
227 throwNgSwitchProviderNotFoundError('ngSwitchDefault', 'NgSwitchDefault');
228 }
229 ngSwitch._addDefault(new SwitchView(viewContainer, templateRef));
230 }
231}
232NgSwitchDefault.decorators = [
233 { type: Directive, args: [{ selector: '[ngSwitchDefault]' },] }
234];
235NgSwitchDefault.ctorParameters = () => [
236 { type: ViewContainerRef },
237 { type: TemplateRef },
238 { type: NgSwitch, decorators: [{ type: Optional }, { type: Host }] }
239];
240function throwNgSwitchProviderNotFoundError(attrName, directiveName) {
241 throw new RuntimeError("305" /* TEMPLATE_STRUCTURE_ERROR */, `An element with the "${attrName}" attribute ` +
242 `(matching the "${directiveName}" directive) must be located inside an element with the "ngSwitch" attribute ` +
243 `(matching "NgSwitch" directive)`);
244}
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Every view that matches is rendered.\n * - If there are no matches, a view with the `ngSwitchDefault` directive is rendered.\n * - Elements within the `[NgSwitch]` statement but outside of any `NgSwitchCase`\n * or `ngSwitchDefault` directive are preserved at the location.\n *\n * @usageNotes\n * Define a container element for the directive, and specify the switch expression\n * to match against as an attribute:\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n * ```\n *\n * Within the container, `*ngSwitchCase` statements specify the match expressions\n * as attributes. Include `*ngSwitchDefault` as the final case.\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *    <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n * ...\n *    <some-element *ngSwitchDefault>...</some-element>\n * </container-element>\n * ```\n *\n * ### Usage Examples\n *\n * The following example shows how to use more than one case to display the same view:\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *   <!-- the same view can be shown in more than one case -->\n *   <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n *   <some-element *ngSwitchCase=\"match_expression_2\">...</some-element>\n *   <some-other-element *ngSwitchCase=\"match_expression_3\">...</some-other-element>\n *   <!--default case when there are no matches -->\n *   <some-element *ngSwitchDefault>...</some-element>\n * </container-element>\n * ```\n *\n * The following example shows how cases can be nested:\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *       <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n *       <some-element *ngSwitchCase=\"match_expression_2\">...</some-element>\n *       <some-other-element *ngSwitchCase=\"match_expression_3\">...</some-other-element>\n *       <ng-container *ngSwitchCase=\"match_expression_3\">\n *         <!-- use a ng-container to group multiple root nodes -->\n *         <inner-element></inner-element>\n *         <inner-other-element></inner-other-element>\n *       </ng-container>\n *       <some-element *ngSwitchDefault>...</some-element>\n *     </container-element>\n * ```\n *\n * @publicApi\n * @see `NgSwitchCase`\n * @see `NgSwitchDefault`\n * @see [Structural Directives](guide/structural-directives)\n *\n */\n@Directive({selector: '[ngSwitch]'})\nexport class NgSwitch {\n  // TODO(issue/24571): remove '!'.\n  private _defaultViews!: SwitchView[];\n  private _defaultUsed = false;\n  private _caseCount = 0;\n  private _lastCaseCheckIndex = 0;\n  private _lastCasesMatched = false;\n  private _ngSwitch: any;\n\n  @Input()\n  set ngSwitch(newValue: any) {\n    this._ngSwitch = newValue;\n    if (this._caseCount === 0) {\n      this._updateDefaultCases(true);\n    }\n  }\n\n  /** @internal */\n  _addCase(): number {\n    return this._caseCount++;\n  }\n\n  /** @internal */\n  _addDefault(view: SwitchView) {\n    if (!this._defaultViews) {\n      this._defaultViews = [];\n    }\n    this._defaultViews.push(view);\n  }\n\n  /** @internal */\n  _matchCase(value: any): boolean {\n    const matched = value == this._ngSwitch;\n    this._lastCasesMatched = this._lastCasesMatched || matched;\n    this._lastCaseCheckIndex++;\n    if (this._lastCaseCheckIndex === this._caseCount) {\n      this._updateDefaultCases(!this._lastCasesMatched);\n      this._lastCaseCheckIndex = 0;\n      this._lastCasesMatched = false;\n    }\n    return matched;\n  }\n\n  private _updateDefaultCases(useDefault: boolean) {\n    if (this._defaultViews && useDefault !== this._defaultUsed) {\n      this._defaultUsed = useDefault;\n      for (let i = 0; i < this._defaultViews.length; i++) {\n        const defaultView = this._defaultViews[i];\n        defaultView.enforceState(useDefault);\n      }\n    }\n  }\n}\n\n/**\n * @ngModule CommonModule\n *\n * @description\n * Provides a switch case expression to match against an enclosing `ngSwitch` expression.\n * When the expressions match, the given `NgSwitchCase` template is rendered.\n * If multiple match expressions match the switch expression value, all of them are displayed.\n *\n * @usageNotes\n *\n * Within a switch container, `*ngSwitchCase` statements specify the match expressions\n * as attributes. Include `*ngSwitchDefault` as the final case.\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *   <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n *   ...\n *   <some-element *ngSwitchDefault>...</some-element>\n * </container-element>\n * ```\n *\n * Each switch-case statement contains an in-line HTML template or template reference\n * that defines the subtree to be selected if the value of the match expression\n * matches the value of the switch expression.\n *\n * Unlike JavaScript, which uses strict equality, Angular uses loose equality.\n * This means that the empty string, `\"\"` matches 0.\n *\n * @publicApi\n * @see `NgSwitch`\n * @see `NgSwitchDefault`\n *\n */\n@Directive({selector: '[ngSwitchCase]'})\nexport class NgSwitchCase implements DoCheck {\n  private _view: SwitchView;\n  /**\n   * Stores the HTML template to be selected on match.\n   */\n  @Input() ngSwitchCase: any;\n\n  constructor(\n      viewContainer: ViewContainerRef, templateRef: TemplateRef<Object>,\n      @Optional() @Host() private ngSwitch: NgSwitch) {\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && !ngSwitch) {\n      throwNgSwitchProviderNotFoundError('ngSwitchCase', 'NgSwitchCase');\n    }\n\n    ngSwitch._addCase();\n    this._view = new SwitchView(viewContainer, templateRef);\n  }\n\n  /**\n   * Performs case matching. For internal use only.\n   */\n  ngDoCheck() {\n    this._view.enforceState(this.ngSwitch._matchCase(this.ngSwitchCase));\n  }\n}\n\n/**\n * @ngModule CommonModule\n *\n * @description\n *\n * Creates a view that is rendered when no `NgSwitchCase` expressions\n * match the `NgSwitch` expression.\n * This statement should be the final case in an `NgSwitch`.\n *\n * @publicApi\n * @see `NgSwitch`\n * @see `NgSwitchCase`\n *\n */\n@Directive({selector: '[ngSwitchDefault]'})\nexport class NgSwitchDefault {\n  constructor(\n      viewContainer: ViewContainerRef, templateRef: TemplateRef<Object>,\n      @Optional() @Host() ngSwitch: NgSwitch) {\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && !ngSwitch) {\n      throwNgSwitchProviderNotFoundError('ngSwitchDefault', 'NgSwitchDefault');\n    }\n\n    ngSwitch._addDefault(new SwitchView(viewContainer, templateRef));\n  }\n}\n\nfunction throwNgSwitchProviderNotFoundError(attrName: string, directiveName: string): never {\n  throw new RuntimeError(\n      RuntimeErrorCode.TEMPLATE_STRUCTURE_ERROR,\n      `An element with the \"${attrName}\" attribute ` +\n          `(matching the \"${\n              directiveName}\" directive) must be located inside an element with the \"ngSwitch\" attribute ` +\n          `(matching \"NgSwitch\" directive)`);\n}\n"]}
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