@angular/compiler
Version:
Angular - the compiler library
101 lines • 15 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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.io/license
*/
import { ParseError } from '../parse_util';
import * as html from './ast';
// http://cldr.unicode.org/index/cldr-spec/plural-rules
const PLURAL_CASES = ['zero', 'one', 'two', 'few', 'many', 'other'];
/**
* Expands special forms into elements.
*
* For example,
*
* ```
* { messages.length, plural,
* =0 {zero}
* =1 {one}
* other {more than one}
* }
* ```
*
* will be expanded into
*
* ```
* <ng-container [ngPlural]="messages.length">
* <ng-template ngPluralCase="=0">zero</ng-template>
* <ng-template ngPluralCase="=1">one</ng-template>
* <ng-template ngPluralCase="other">more than one</ng-template>
* </ng-container>
* ```
*/
export function expandNodes(nodes) {
const expander = new _Expander();
return new ExpansionResult(html.visitAll(expander, nodes), expander.isExpanded, expander.errors);
}
export class ExpansionResult {
constructor(nodes, expanded, errors) {
this.nodes = nodes;
this.expanded = expanded;
this.errors = errors;
}
}
export class ExpansionError extends ParseError {
constructor(span, errorMsg) { super(span, errorMsg); }
}
/**
* Expand expansion forms (plural, select) to directives
*
* @internal
*/
class _Expander {
constructor() {
this.isExpanded = false;
this.errors = [];
}
visitElement(element, context) {
return new html.Element(element.name, element.attrs, html.visitAll(this, element.children), element.sourceSpan, element.startSourceSpan, element.endSourceSpan);
}
visitAttribute(attribute, context) { return attribute; }
visitText(text, context) { return text; }
visitComment(comment, context) { return comment; }
visitExpansion(icu, context) {
this.isExpanded = true;
return icu.type == 'plural' ? _expandPluralForm(icu, this.errors) :
_expandDefaultForm(icu, this.errors);
}
visitExpansionCase(icuCase, context) {
throw new Error('Should not be reached');
}
}
// Plural forms are expanded to `NgPlural` and `NgPluralCase`s
function _expandPluralForm(ast, errors) {
const children = ast.cases.map(c => {
if (PLURAL_CASES.indexOf(c.value) == -1 && !c.value.match(/^=\d+$/)) {
errors.push(new ExpansionError(c.valueSourceSpan, `Plural cases should be "=<number>" or one of ${PLURAL_CASES.join(", ")}`));
}
const expansionResult = expandNodes(c.expression);
errors.push(...expansionResult.errors);
return new html.Element(`ng-template`, [new html.Attribute('ngPluralCase', `${c.value}`, c.valueSourceSpan)], expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);
});
const switchAttr = new html.Attribute('[ngPlural]', ast.switchValue, ast.switchValueSourceSpan);
return new html.Element('ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
}
// ICU messages (excluding plural form) are expanded to `NgSwitch` and `NgSwitchCase`s
function _expandDefaultForm(ast, errors) {
const children = ast.cases.map(c => {
const expansionResult = expandNodes(c.expression);
errors.push(...expansionResult.errors);
if (c.value === 'other') {
// other is the default case when no values match
return new html.Element(`ng-template`, [new html.Attribute('ngSwitchDefault', '', c.valueSourceSpan)], expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);
}
return new html.Element(`ng-template`, [new html.Attribute('ngSwitchCase', `${c.value}`, c.valueSourceSpan)], expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);
});
const switchAttr = new html.Attribute('[ngSwitch]', ast.switchValue, ast.switchValueSourceSpan);
return new html.Element('ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
}
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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) { super(span, errorMsg); }\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 { return attribute; }\n\n  visitText(text: html.Text, context: any): any { return text; }\n\n  visitComment(comment: html.Comment, context: any): any { return comment; }\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 ${PLURAL_CASES.join(\", \")}`));\n    }\n\n    const expansionResult = expandNodes(c.expression);\n    errors.push(...expansionResult.errors);\n\n    return new html.Element(\n        `ng-template`, [new html.Attribute('ngPluralCase', `${c.value}`, c.valueSourceSpan)],\n        expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);\n  });\n  const switchAttr = new html.Attribute('[ngPlural]', ast.switchValue, ast.switchValueSourceSpan);\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`, [new html.Attribute('ngSwitchDefault', '', c.valueSourceSpan)],\n          expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);\n    }\n\n    return new html.Element(\n        `ng-template`, [new html.Attribute('ngSwitchCase', `${c.value}`, c.valueSourceSpan)],\n        expansionResult.nodes, c.sourceSpan, c.sourceSpan, c.sourceSpan);\n  });\n  const switchAttr = new html.Attribute('[ngSwitch]', ast.switchValue, ast.switchValueSourceSpan);\n  return new html.Element(\n      'ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);\n}\n"]}