react app

react-app/node_modules/react/lib/ReactMarkupChecksum.js

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+/**
+ * Copyright 2013-2015, 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.
+ *
+ * @providesModule ReactMarkupChecksum
+ */
+
+'use strict';
+
+var adler32 = require("./adler32");
+
+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);
+    return markup.replace(
+      '>',
+      ' ' + 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;