49 lines
1.8 KiB
JavaScript
49 lines
1.8 KiB
JavaScript
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var baseToString = require('../internal/baseToString'),
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escapeHtmlChar = require('../internal/escapeHtmlChar');
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/** Used to match HTML entities and HTML characters. */
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var reUnescapedHtml = /[&<>"'`]/g,
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reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
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/**
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* Converts the characters "&", "<", ">", '"', "'", and "\`", in `string` to
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* their corresponding HTML entities.
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*
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* **Note:** No other characters are escaped. To escape additional characters
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* use a third-party library like [_he_](https://mths.be/he).
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*
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* Though the ">" character is escaped for symmetry, characters like
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* ">" and "/" don't need escaping in HTML and have no special meaning
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* unless they're part of a tag or unquoted attribute value.
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* See [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
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* (under "semi-related fun fact") for more details.
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*
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* Backticks are escaped because in Internet Explorer < 9, they can break out
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* of attribute values or HTML comments. See [#59](https://html5sec.org/#59),
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* [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
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* [#133](https://html5sec.org/#133) of the [HTML5 Security Cheatsheet](https://html5sec.org/)
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* for more details.
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*
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* When working with HTML you should always [quote attribute values](http://wonko.com/post/html-escaping)
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* to reduce XSS vectors.
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*
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* @static
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* @memberOf _
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* @category String
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* @param {string} [string=''] The string to escape.
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* @returns {string} Returns the escaped string.
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* @example
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*
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* _.escape('fred, barney, & pebbles');
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* // => 'fred, barney, & pebbles'
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*/
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function escape(string) {
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// Reset `lastIndex` because in IE < 9 `String#replace` does not.
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string = baseToString(string);
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return (string && reHasUnescapedHtml.test(string))
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? string.replace(reUnescapedHtml, escapeHtmlChar)
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: string;
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}
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module.exports = escape;
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