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