chrome/browser/resources/chromeos/chromevox/common/string_util.js

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview Utilities for strings.
   7  */
   8
   9 goog.provide('StringUtil');
  10
  11 /**
  12  * @constructor
  13  */
  14 StringUtil = function() {};
  15
  16 /**
  17  * Returns the length of the longest common prefix of two strings.
  18  * @param {string} first The first string.
  19  * @param {string} second The second string.
  20  * @return {number} The length of the longest common prefix, which may be 0
  21  *     for an empty common prefix.
  22  */
  23 StringUtil.longestCommonPrefixLength = function(first, second) {
  24   var limit = Math.min(first.length, second.length);
  25   var i;
  26   for (i = 0; i < limit; ++i) {
  27     if (first.charAt(i) != second.charAt(i)) {
  28       break;
  29     }
  30   }
  31   return i;
  32 };