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/**
* Copyright 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
'use strict';
var adler32 = require('./adler32');
var TAG_END = /\/?>/;
var COMMENT_START = /^<\!\-\-/;
var ReactMarkupChecksum = {
CHECKSUM_ATTR_NAME: 'data-react-checksum',
/**
* @param {string} markup Markup string
* @return {string} Markup string with checksum attribute attached
*/
addChecksumToMarkup: function (markup) {
var checksum = adler32(markup);
// Add checksum (handle both parent tags, comments and self-closing tags)
if (COMMENT_START.test(markup)) {
return markup;
} else {
return markup.replace(TAG_END, ' ' + ReactMarkupChecksum.CHECKSUM_ATTR_NAME + '="' + checksum + '"$&');
}
},
/**
* @param {string} markup to use
* @param {DOMElement} element root React element
* @returns {boolean} whether or not the markup is the same
*/
canReuseMarkup: function (markup, element) {
var existingChecksum = element.getAttribute(ReactMarkupChecksum.CHECKSUM_ATTR_NAME);
existingChecksum = existingChecksum && parseInt(existingChecksum, 10);
var markupChecksum = adler32(markup);
return markupChecksum === existingChecksum;
}
};
module.exports = ReactMarkupChecksum;
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