react app

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

@@ -0,0 +1,120 @@
+/**
+ * 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 ReactReconciler
+ */
+
+'use strict';
+
+var ReactRef = require("./ReactRef");
+var ReactElementValidator = require("./ReactElementValidator");
+
+/**
+ * Helper to call ReactRef.attachRefs with this composite component, split out
+ * to avoid allocations in the transaction mount-ready queue.
+ */
+function attachRefs() {
+  ReactRef.attachRefs(this, this._currentElement);
+}
+
+var ReactReconciler = {
+
+  /**
+   * Initializes the component, renders markup, and registers event listeners.
+   *
+   * @param {ReactComponent} internalInstance
+   * @param {string} rootID DOM ID of the root node.
+   * @param {ReactReconcileTransaction|ReactServerRenderingTransaction} transaction
+   * @return {?string} Rendered markup to be inserted into the DOM.
+   * @final
+   * @internal
+   */
+  mountComponent: function(internalInstance, rootID, transaction, context) {
+    var markup = internalInstance.mountComponent(rootID, transaction, context);
+    if ("production" !== process.env.NODE_ENV) {
+      ReactElementValidator.checkAndWarnForMutatedProps(
+        internalInstance._currentElement
+      );
+    }
+    transaction.getReactMountReady().enqueue(attachRefs, internalInstance);
+    return markup;
+  },
+
+  /**
+   * Releases any resources allocated by `mountComponent`.
+   *
+   * @final
+   * @internal
+   */
+  unmountComponent: function(internalInstance) {
+    ReactRef.detachRefs(internalInstance, internalInstance._currentElement);
+    internalInstance.unmountComponent();
+  },
+
+  /**
+   * Update a component using a new element.
+   *
+   * @param {ReactComponent} internalInstance
+   * @param {ReactElement} nextElement
+   * @param {ReactReconcileTransaction} transaction
+   * @param {object} context
+   * @internal
+   */
+  receiveComponent: function(
+    internalInstance, nextElement, transaction, context
+  ) {
+    var prevElement = internalInstance._currentElement;
+
+    if (nextElement === prevElement && nextElement._owner != null) {
+      // Since elements are immutable after the owner is rendered,
+      // we can do a cheap identity compare here to determine if this is a
+      // superfluous reconcile. It's possible for state to be mutable but such
+      // change should trigger an update of the owner which would recreate
+      // the element. We explicitly check for the existence of an owner since
+      // it's possible for an element created outside a composite to be
+      // deeply mutated and reused.
+      return;
+    }
+
+    if ("production" !== process.env.NODE_ENV) {
+      ReactElementValidator.checkAndWarnForMutatedProps(nextElement);
+    }
+
+    var refsChanged = ReactRef.shouldUpdateRefs(
+      prevElement,
+      nextElement
+    );
+
+    if (refsChanged) {
+      ReactRef.detachRefs(internalInstance, prevElement);
+    }
+
+    internalInstance.receiveComponent(nextElement, transaction, context);
+
+    if (refsChanged) {
+      transaction.getReactMountReady().enqueue(attachRefs, internalInstance);
+    }
+  },
+
+  /**
+   * Flush any dirty changes in a component.
+   *
+   * @param {ReactComponent} internalInstance
+   * @param {ReactReconcileTransaction} transaction
+   * @internal
+   */
+  performUpdateIfNecessary: function(
+    internalInstance,
+    transaction
+  ) {
+    internalInstance.performUpdateIfNecessary(transaction);
+  }
+
+};
+
+module.exports = ReactReconciler;