opusdev/vector-similarity-api

1/*!2 * escape-html3 * Copyright(c) 2012-2013 TJ Holowaychuk4 * Copyright(c) 2015 Andreas Lubbe5 * Copyright(c) 2015 Tiancheng "Timothy" Gu6 * MIT Licensed7 */8 9'use strict';10 11/**12 * Module variables.13 * @private14 */15 16var matchHtmlRegExp = /["'&<>]/;17 18/**19 * Module exports.20 * @public21 */22 23module.exports = escapeHtml;24 25/**26 * Escape special characters in the given string of html.27 *28 * @param  {string} string The string to escape for inserting into HTML29 * @return {string}30 * @public31 */32 33function escapeHtml(string) {34  var str = '' + string;35  var match = matchHtmlRegExp.exec(str);36 37  if (!match) {38    return str;39  }40 41  var escape;42  var html = '';43  var index = 0;44  var lastIndex = 0;45 46  for (index = match.index; index < str.length; index++) {47    switch (str.charCodeAt(index)) {48      case 34: // "49        escape = '&quot;';50        break;51      case 38: // &52        escape = '&amp;';53        break;54      case 39: // '55        escape = '&#39;';56        break;57      case 60: // <58        escape = '&lt;';59        break;60      case 62: // >61        escape = '&gt;';62        break;63      default:64        continue;65    }66 67    if (lastIndex !== index) {68      html += str.substring(lastIndex, index);69    }70 71    lastIndex = index + 1;72    html += escape;73  }74 75  return lastIndex !== index76    ? html + str.substring(lastIndex, index)77    : html;78}79