Add ReactIntrospection

src/isomorphic/ReactIntrospection.js

@@ -0,0 +1,91 @@
+/**
+ * Copyright 2016-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.
+ *
+ * @providesModule ReactIntrospection
+ */
+
+'use strict';
+
+var invariant = require('invariant');
+
+function validateInstance(instance) {
+  invariant(
+    typeof instance.mountComponent === 'function',
+    'ReactIntrospection: Argument is not an internal instance.'
+  );
+}
+
+function getChildren(instance) {
+  if (instance == null) {
+    return [];
+  }
+  validateInstance(instance);
+
+  if (instance._renderedComponent) {
+    if (instance._renderedComponent._currentElement) {
+      return [instance._renderedComponent];
+    } else {
+      return [];
+    }
+  } else if (instance._renderedChildren) {
+    var children = [];
+    for (var key in instance._renderedChildren) {
+      children.push(instance._renderedChildren[key]);
+    }
+    return children;
+  } else {
+    return [];
+  }
+}
+
+function getDisplayName(instance) {
+  if (instance == null) {
+    return 'Unknown';
+  }
+  validateInstance(instance);
+
+  var name;
+  if (instance.getName) {
+    name = instance.getName();
+  }
+  if (name) {
+    return name;
+  }
+  var element = instance._currentElement;
+  if (element == null) {
+    name = '#empty';
+  } else if (typeof element === 'string' || typeof element === 'number') {
+    name = '#text';
+  } else if (typeof element.type === 'string') {
+    name = element.type;
+  } else {
+    name = element.type.displayName || element.type.name;
+  }
+  return name || 'Unknown';
+}
+
+function isComposite(instance) {
+  if (instance == null) {
+    return false;
+  }
+  validateInstance(instance);
+
+  var element = instance._currentElement;
+  if (element == null) {
+    return false;
+  }
+  return typeof element.type === 'function';
+}
+
+var ReactIntrospection = {
+  getChildren,
+  getDisplayName,
+  isComposite,
+};
+
+module.exports = ReactIntrospection;