node_modules

1 files changed, 194 insertions, 0 deletions

diff --git a/node_modules/react-dom/lib/ReactDOMComponentTree.js b/node_modules/react-dom/lib/ReactDOMComponentTree.js
new file mode 100644
index 000000000..2b34ddf73
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+++ b/node_modules/react-dom/lib/ReactDOMComponentTree.js
@@ -0,0 +1,194 @@
+/**
+ * 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 _prodInvariant = require('./reactProdInvariant');
+
+var DOMProperty = require('./DOMProperty');
+var ReactDOMComponentFlags = require('./ReactDOMComponentFlags');
+
+var invariant = require('fbjs/lib/invariant');
+
+var ATTR_NAME = DOMProperty.ID_ATTRIBUTE_NAME;
+var Flags = ReactDOMComponentFlags;
+
+var internalInstanceKey = '__reactInternalInstance$' + Math.random().toString(36).slice(2);
+
+/**
+ * Check if a given node should be cached.
+ */
+function shouldPrecacheNode(node, nodeID) {
+  return node.nodeType === 1 && node.getAttribute(ATTR_NAME) === String(nodeID) || node.nodeType === 8 && node.nodeValue === ' react-text: ' + nodeID + ' ' || node.nodeType === 8 && node.nodeValue === ' react-empty: ' + nodeID + ' ';
+}
+
+/**
+ * Drill down (through composites and empty components) until we get a host or
+ * host text component.
+ *
+ * This is pretty polymorphic but unavoidable with the current structure we have
+ * for `_renderedChildren`.
+ */
+function getRenderedHostOrTextFromComponent(component) {
+  var rendered;
+  while (rendered = component._renderedComponent) {
+    component = rendered;
+  }
+  return component;
+}
+
+/**
+ * Populate `_hostNode` on the rendered host/text component with the given
+ * DOM node. The passed `inst` can be a composite.
+ */
+function precacheNode(inst, node) {
+  var hostInst = getRenderedHostOrTextFromComponent(inst);
+  hostInst._hostNode = node;
+  node[internalInstanceKey] = hostInst;
+}
+
+function uncacheNode(inst) {
+  var node = inst._hostNode;
+  if (node) {
+    delete node[internalInstanceKey];
+    inst._hostNode = null;
+  }
+}
+
+/**
+ * Populate `_hostNode` on each child of `inst`, assuming that the children
+ * match up with the DOM (element) children of `node`.
+ *
+ * We cache entire levels at once to avoid an n^2 problem where we access the
+ * children of a node sequentially and have to walk from the start to our target
+ * node every time.
+ *
+ * Since we update `_renderedChildren` and the actual DOM at (slightly)
+ * different times, we could race here and see a newer `_renderedChildren` than
+ * the DOM nodes we see. To avoid this, ReactMultiChild calls
+ * `prepareToManageChildren` before we change `_renderedChildren`, at which
+ * time the container's child nodes are always cached (until it unmounts).
+ */
+function precacheChildNodes(inst, node) {
+  if (inst._flags & Flags.hasCachedChildNodes) {
+    return;
+  }
+  var children = inst._renderedChildren;
+  var childNode = node.firstChild;
+  outer: for (var name in children) {
+    if (!children.hasOwnProperty(name)) {
+      continue;
+    }
+    var childInst = children[name];
+    var childID = getRenderedHostOrTextFromComponent(childInst)._domID;
+    if (childID === 0) {
+      // We're currently unmounting this child in ReactMultiChild; skip it.
+      continue;
+    }
+    // We assume the child nodes are in the same order as the child instances.
+    for (; childNode !== null; childNode = childNode.nextSibling) {
+      if (shouldPrecacheNode(childNode, childID)) {
+        precacheNode(childInst, childNode);
+        continue outer;
+      }
+    }
+    // We reached the end of the DOM children without finding an ID match.
+    !false ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Unable to find element with ID %s.', childID) : _prodInvariant('32', childID) : void 0;
+  }
+  inst._flags |= Flags.hasCachedChildNodes;
+}
+
+/**
+ * Given a DOM node, return the closest ReactDOMComponent or
+ * ReactDOMTextComponent instance ancestor.
+ */
+function getClosestInstanceFromNode(node) {
+  if (node[internalInstanceKey]) {
+    return node[internalInstanceKey];
+  }
+
+  // Walk up the tree until we find an ancestor whose instance we have cached.
+  var parents = [];
+  while (!node[internalInstanceKey]) {
+    parents.push(node);
+    if (node.parentNode) {
+      node = node.parentNode;
+    } else {
+      // Top of the tree. This node must not be part of a React tree (or is
+      // unmounted, potentially).
+      return null;
+    }
+  }
+
+  var closest;
+  var inst;
+  for (; node && (inst = node[internalInstanceKey]); node = parents.pop()) {
+    closest = inst;
+    if (parents.length) {
+      precacheChildNodes(inst, node);
+    }
+  }
+
+  return closest;
+}
+
+/**
+ * Given a DOM node, return the ReactDOMComponent or ReactDOMTextComponent
+ * instance, or null if the node was not rendered by this React.
+ */
+function getInstanceFromNode(node) {
+  var inst = getClosestInstanceFromNode(node);
+  if (inst != null && inst._hostNode === node) {
+    return inst;
+  } else {
+    return null;
+  }
+}
+
+/**
+ * Given a ReactDOMComponent or ReactDOMTextComponent, return the corresponding
+ * DOM node.
+ */
+function getNodeFromInstance(inst) {
+  // Without this first invariant, passing a non-DOM-component triggers the next
+  // invariant for a missing parent, which is super confusing.
+  !(inst._hostNode !== undefined) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'getNodeFromInstance: Invalid argument.') : _prodInvariant('33') : void 0;
+
+  if (inst._hostNode) {
+    return inst._hostNode;
+  }
+
+  // Walk up the tree until we find an ancestor whose DOM node we have cached.
+  var parents = [];
+  while (!inst._hostNode) {
+    parents.push(inst);
+    !inst._hostParent ? process.env.NODE_ENV !== 'production' ? invariant(false, 'React DOM tree root should always have a node reference.') : _prodInvariant('34') : void 0;
+    inst = inst._hostParent;
+  }
+
+  // Now parents contains each ancestor that does *not* have a cached native
+  // node, and `inst` is the deepest ancestor that does.
+  for (; parents.length; inst = parents.pop()) {
+    precacheChildNodes(inst, inst._hostNode);
+  }
+
+  return inst._hostNode;
+}
+
+var ReactDOMComponentTree = {
+  getClosestInstanceFromNode: getClosestInstanceFromNode,
+  getInstanceFromNode: getInstanceFromNode,
+  getNodeFromInstance: getNodeFromInstance,
+  precacheChildNodes: precacheChildNodes,
+  precacheNode: precacheNode,
+  uncacheNode: uncacheNode
+};
+
+module.exports = ReactDOMComponentTree;
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