@angular/core
Version:
Angular - the core framework
39 lines • 5.02 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { assertNotEqual } from '../../util/assert';
/**
* Returns an index of `classToSearch` in `className` taking token boundaries into account.
*
* `classIndexOf('AB A', 'A', 0)` will be 3 (not 0 since `AB!==A`)
*
* @param className A string containing classes (whitespace separated)
* @param classToSearch A class name to locate
* @param startingIndex Starting location of search
* @returns an index of the located class (or -1 if not found)
*/
export function classIndexOf(className, classToSearch, startingIndex) {
ngDevMode && assertNotEqual(classToSearch, '', 'can not look for "" string.');
let end = className.length;
while (true) {
const foundIndex = className.indexOf(classToSearch, startingIndex);
if (foundIndex === -1)
return foundIndex;
if (foundIndex === 0 || className.charCodeAt(foundIndex - 1) <= 32 /* CharCode.SPACE */) {
// Ensure that it has leading whitespace
const length = classToSearch.length;
if (foundIndex + length === end ||
className.charCodeAt(foundIndex + length) <= 32 /* CharCode.SPACE */) {
// Ensure that it has trailing whitespace
return foundIndex;
}
}
// False positive, keep searching from where we left off.
startingIndex = foundIndex + 1;
}
}
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