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/**
* 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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