angular-cn/packages/core/schematics/test/helpers.ts

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/**
* @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
*/
/**
* Template string function that can be used to dedent the resulting
* string literal. The smallest common indentation will be omitted.
*/
export function dedent(strings: TemplateStringsArray, ...values: any[]) {
let joinedString = '';
for (let i = 0; i < values.length; i++) {
joinedString += `${strings[i]}${values[i]}`;
}
joinedString += strings[strings.length - 1];
const matches = joinedString.match(/^[ \t]*(?=\S)/gm);
if (matches === null) {
return joinedString;
}
const minLineIndent = Math.min(...matches.map(el => el.length));
const omitMinIndentRegex = new RegExp(`^[ \\t]{${minLineIndent}}`, 'gm');
return minLineIndent > 0 ? joinedString.replace(omitMinIndentRegex, '') : joinedString;
}