1 files changed, 49 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/ReactMarkupChecksum.js b/node_modules/react-dom/lib/ReactMarkupChecksum.js
new file mode 100644
index 000000000..fda495bdf
--- /dev/null
+++ b/node_modules/react-dom/lib/ReactMarkupChecksum.js
@@ -0,0 +1,49 @@
+/**
+ * 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;
+\ No newline at end of file