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 { ParseError } from '../parse_util';
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9 | import * as html from './ast';
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10 | // http://cldr.unicode.org/index/cldr-spec/plural-rules
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11 | const PLURAL_CASES = ['zero', 'one', 'two', 'few', 'many', 'other'];
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12 | /**
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13 | * Expands special forms into elements.
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14 | *
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15 | * For example,
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16 | *
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17 | * ```
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18 | * { messages.length, plural,
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19 | * =0 {zero}
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20 | * =1 {one}
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21 | * other {more than one}
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22 | * }
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23 | * ```
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24 | *
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25 | * will be expanded into
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26 | *
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27 | * ```
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28 | * <ng-container [ngPlural]="messages.length">
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29 | * <ng-template ngPluralCase="=0">zero</ng-template>
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30 | * <ng-template ngPluralCase="=1">one</ng-template>
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31 | * <ng-template ngPluralCase="other">more than one</ng-template>
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32 | * </ng-container>
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33 | * ```
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34 | */
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35 | export function expandNodes(nodes) {
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36 | const expander = new _Expander();
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37 | return new ExpansionResult(html.visitAll(expander, nodes), expander.isExpanded, expander.errors);
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38 | }
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39 | export class ExpansionResult {
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40 | constructor(nodes, expanded, errors) {
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41 | this.nodes = nodes;
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42 | this.expanded = expanded;
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43 | this.errors = errors;
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44 | }
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45 | }
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46 | export class ExpansionError extends ParseError {
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47 | constructor(span, errorMsg) {
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48 | super(span, errorMsg);
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49 | }
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50 | }
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51 | /**
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52 | * Expand expansion forms (plural, select) to directives
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53 | *
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54 | * @internal
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55 | */
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56 | class _Expander {
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57 | constructor() {
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58 | this.isExpanded = false;
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59 | this.errors = [];
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60 | }
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61 | visitElement(element, context) {
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62 | return new html.Element(element.name, element.attrs, html.visitAll(this, element.children), element.sourceSpan, element.startSourceSpan, element.endSourceSpan);
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63 | }
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64 | visitAttribute(attribute, context) {
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65 | return attribute;
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66 | }
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67 | visitText(text, context) {
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68 | return text;
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69 | }
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70 | visitComment(comment, context) {
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71 | return comment;
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72 | }
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73 | visitExpansion(icu, context) {
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74 | this.isExpanded = true;
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75 | return icu.type === 'plural' ? _expandPluralForm(icu, this.errors) :
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76 | _expandDefaultForm(icu, this.errors);
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77 | }
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78 | visitExpansionCase(icuCase, context) {
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79 | throw new Error('Should not be reached');
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80 | }
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81 | }
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82 | // Plural forms are expanded to `NgPlural` and `NgPluralCase`s
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83 | function _expandPluralForm(ast, errors) {
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84 | const children = ast.cases.map(c => {
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85 | if (PLURAL_CASES.indexOf(c.value) === -1 && !c.value.match(/^=\d+$/)) {
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86 | errors.push(new ExpansionError(c.valueSourceSpan, `Plural cases should be "=<number>" or one of ${PLURAL_CASES.join(', ')}`));
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87 | }
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88 | const expansionResult = expandNodes(c.expression);
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89 | errors.push(...expansionResult.errors);
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90 | return new html.Element(`ng-template`, [new html.Attribute('ngPluralCase', `${c.value}`, c.valueSourceSpan, undefined /* keySpan */, undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */)], expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);
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91 | });
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92 | const switchAttr = new html.Attribute('[ngPlural]', ast.switchValue, ast.switchValueSourceSpan, undefined /* keySpan */, undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */);
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93 | return new html.Element('ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
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94 | }
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95 | // ICU messages (excluding plural form) are expanded to `NgSwitch` and `NgSwitchCase`s
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96 | function _expandDefaultForm(ast, errors) {
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97 | const children = ast.cases.map(c => {
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98 | const expansionResult = expandNodes(c.expression);
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99 | errors.push(...expansionResult.errors);
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100 | if (c.value === 'other') {
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101 | // other is the default case when no values match
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102 | return new html.Element(`ng-template`, [new html.Attribute('ngSwitchDefault', '', c.valueSourceSpan, undefined /* keySpan */, undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */)], expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);
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103 | }
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104 | return new html.Element(`ng-template`, [new html.Attribute('ngSwitchCase', `${c.value}`, c.valueSourceSpan, undefined /* keySpan */, undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */)], expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);
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105 | });
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106 | const switchAttr = new html.Attribute('[ngSwitch]', ast.switchValue, ast.switchValueSourceSpan, undefined /* keySpan */, undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */);
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107 | return new html.Element('ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
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108 | }
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ParseError, ParseSourceSpan} from '../parse_util';\n\nimport * as html from './ast';\n\n// http://cldr.unicode.org/index/cldr-spec/plural-rules\nconst PLURAL_CASES: string[] = ['zero', 'one', 'two', 'few', 'many', 'other'];\n\n/**\n * Expands special forms into elements.\n *\n * For example,\n *\n * ```\n * { messages.length, plural,\n *   =0 {zero}\n *   =1 {one}\n *   other {more than one}\n * }\n * ```\n *\n * will be expanded into\n *\n * ```\n * <ng-container [ngPlural]=\"messages.length\">\n *   <ng-template ngPluralCase=\"=0\">zero</ng-template>\n *   <ng-template ngPluralCase=\"=1\">one</ng-template>\n *   <ng-template ngPluralCase=\"other\">more than one</ng-template>\n * </ng-container>\n * ```\n */\nexport function expandNodes(nodes: html.Node[]): ExpansionResult {\n  const expander = new _Expander();\n  return new ExpansionResult(html.visitAll(expander, nodes), expander.isExpanded, expander.errors);\n}\n\nexport class ExpansionResult {\n  constructor(public nodes: html.Node[], public expanded: boolean, public errors: ParseError[]) {}\n}\n\nexport class ExpansionError extends ParseError {\n  constructor(span: ParseSourceSpan, errorMsg: string) {\n    super(span, errorMsg);\n  }\n}\n\n/**\n * Expand expansion forms (plural, select) to directives\n *\n * @internal\n */\nclass _Expander implements html.Visitor {\n  isExpanded: boolean = false;\n  errors: ParseError[] = [];\n\n  visitElement(element: html.Element, context: any): any {\n    return new html.Element(\n        element.name, element.attrs, html.visitAll(this, element.children), element.sourceSpan,\n        element.startSourceSpan, element.endSourceSpan);\n  }\n\n  visitAttribute(attribute: html.Attribute, context: any): any {\n    return attribute;\n  }\n\n  visitText(text: html.Text, context: any): any {\n    return text;\n  }\n\n  visitComment(comment: html.Comment, context: any): any {\n    return comment;\n  }\n\n  visitExpansion(icu: html.Expansion, context: any): any {\n    this.isExpanded = true;\n    return icu.type === 'plural' ? _expandPluralForm(icu, this.errors) :\n                                   _expandDefaultForm(icu, this.errors);\n  }\n\n  visitExpansionCase(icuCase: html.ExpansionCase, context: any): any {\n    throw new Error('Should not be reached');\n  }\n}\n\n// Plural forms are expanded to `NgPlural` and `NgPluralCase`s\nfunction _expandPluralForm(ast: html.Expansion, errors: ParseError[]): html.Element {\n  const children = ast.cases.map(c => {\n    if (PLURAL_CASES.indexOf(c.value) === -1 && !c.value.match(/^=\\d+$/)) {\n      errors.push(new ExpansionError(\n          c.valueSourceSpan,\n          `Plural cases should be \"=<number>\" or one of ${PLURAL_CASES.join(', ')}`));\n    }\n\n    const expansionResult = expandNodes(c.expression);\n    errors.push(...expansionResult.errors);\n\n    return new html.Element(\n        `ng-template`,\n        [new html.Attribute(\n            'ngPluralCase', `${c.value}`, c.valueSourceSpan, undefined /* keySpan */,\n            undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */)],\n        expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);\n  });\n  const switchAttr = new html.Attribute(\n      '[ngPlural]', ast.switchValue, ast.switchValueSourceSpan, undefined /* keySpan */,\n      undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */);\n  return new html.Element(\n      'ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);\n}\n\n// ICU messages (excluding plural form) are expanded to `NgSwitch`  and `NgSwitchCase`s\nfunction _expandDefaultForm(ast: html.Expansion, errors: ParseError[]): html.Element {\n  const children = ast.cases.map(c => {\n    const expansionResult = expandNodes(c.expression);\n    errors.push(...expansionResult.errors);\n\n    if (c.value === 'other') {\n      // other is the default case when no values match\n      return new html.Element(\n          `ng-template`,\n          [new html.Attribute(\n              'ngSwitchDefault', '', c.valueSourceSpan, undefined /* keySpan */,\n              undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */)],\n          expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);\n    }\n\n    return new html.Element(\n        `ng-template`,\n        [new html.Attribute(\n            'ngSwitchCase', `${c.value}`, c.valueSourceSpan, undefined /* keySpan */,\n            undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */)],\n        expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);\n  });\n  const switchAttr = new html.Attribute(\n      '[ngSwitch]', ast.switchValue, ast.switchValueSourceSpan, undefined /* keySpan */,\n      undefined /* valueSpan */, undefined /* valueTokens */, undefined /* i18n */);\n  return new html.Element(\n      'ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);\n}\n"]} |
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