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