index.js
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/*!
* escape-html
* Copyright(c) 2012-2013 TJ Holowaychuk
* Copyright(c) 2015 Andreas Lubbe
* Copyright(c) 2015 Tiancheng "Timothy" Gu
* MIT Licensed
*/
'use strict';
/**
* Module variables.
* @private
*/
var matchHtmlRegExp = /["'&<>]/;
/**
* Module exports.
* @public
*/
module.exports = escapeHtml;
/**
* Escape special characters in the given string of html.
*
* @param {string} string The string to escape for inserting into HTML
* @return {string}
* @public
*/
function escapeHtml(string) {
var str = '' + string;
var match = matchHtmlRegExp.exec(str);
if (!match) {
return str;
}
var escape;
var html = '';
var index = 0;
var lastIndex = 0;
for (index = match.index; index < str.length; index++) {
switch (str.charCodeAt(index)) {
case 34: // "
escape = '"';
break;
case 38: // &
escape = '&';
break;
case 39: // '
escape = ''';
break;
case 60: // <
escape = '<';
break;
case 62: // >
escape = '>';
break;
default:
continue;
}
if (lastIndex !== index) {
html += str.substring(lastIndex, index);
}
lastIndex = index + 1;
html += escape;
}
return lastIndex !== index
? html + str.substring(lastIndex, index)
: html;
}