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