Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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[6a3a178] | 1 | /*!
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| 2 | * escape-html
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| 3 | * Copyright(c) 2012-2013 TJ Holowaychuk
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| 4 | * Copyright(c) 2015 Andreas Lubbe
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| 5 | * Copyright(c) 2015 Tiancheng "Timothy" Gu
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| 6 | * MIT Licensed
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| 7 | */
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| 8 |
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| 9 | 'use strict';
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| 10 |
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| 11 | /**
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| 12 | * Module variables.
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| 13 | * @private
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| 14 | */
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| 15 |
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| 16 | var matchHtmlRegExp = /["'&<>]/;
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| 17 |
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| 18 | /**
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| 19 | * Module exports.
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| 20 | * @public
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| 21 | */
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| 22 |
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| 23 | module.exports = escapeHtml;
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| 24 |
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| 25 | /**
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| 26 | * Escape special characters in the given string of html.
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| 27 | *
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| 28 | * @param {string} string The string to escape for inserting into HTML
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| 29 | * @return {string}
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| 30 | * @public
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| 31 | */
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| 32 |
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| 33 | function escapeHtml(string) {
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| 34 | var str = '' + string;
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| 35 | var match = matchHtmlRegExp.exec(str);
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| 36 |
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| 37 | if (!match) {
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| 38 | return str;
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| 39 | }
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| 40 |
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| 41 | var escape;
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| 42 | var html = '';
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| 43 | var index = 0;
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| 44 | var lastIndex = 0;
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| 45 |
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| 46 | for (index = match.index; index < str.length; index++) {
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| 47 | switch (str.charCodeAt(index)) {
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| 48 | case 34: // "
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| 49 | escape = '"';
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| 50 | break;
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| 51 | case 38: // &
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| 52 | escape = '&';
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| 53 | break;
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| 54 | case 39: // '
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| 55 | escape = ''';
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| 56 | break;
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| 57 | case 60: // <
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| 58 | escape = '<';
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| 59 | break;
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| 60 | case 62: // >
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| 61 | escape = '>';
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| 62 | break;
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| 63 | default:
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| 64 | continue;
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| 65 | }
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| 66 |
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| 67 | if (lastIndex !== index) {
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| 68 | html += str.substring(lastIndex, index);
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| 69 | }
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| 70 |
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| 71 | lastIndex = index + 1;
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| 72 | html += escape;
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| 73 | }
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| 74 |
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| 75 | return lastIndex !== index
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| 76 | ? html + str.substring(lastIndex, index)
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| 77 | : html;
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| 78 | }
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