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