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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 ReactCurrentOwner = require('react/lib/ReactCurrentOwner');
var REACT_ELEMENT_TYPE = require('./ReactElementSymbol');
var getIteratorFn = require('./getIteratorFn');
var invariant = require('fbjs/lib/invariant');
var KeyEscapeUtils = require('./KeyEscapeUtils');
var warning = require('fbjs/lib/warning');
var SEPARATOR = '.';
var SUBSEPARATOR = ':';
/**
* This is inlined from ReactElement since this file is shared between
* isomorphic and renderers. We could extract this to a
*
*/
/**
* TODO: Test that a single child and an array with one item have the same key
* pattern.
*/
var didWarnAboutMaps = false;
/**
* Generate a key string that identifies a component within a set.
*
* @param {*} component A component that could contain a manual key.
* @param {number} index Index that is used if a manual key is not provided.
* @return {string}
*/
function getComponentKey(component, index) {
// Do some typechecking here since we call this blindly. We want to ensure
// that we don't block potential future ES APIs.
if (component && typeof component === 'object' && component.key != null) {
// Explicit key
return KeyEscapeUtils.escape(component.key);
}
// Implicit key determined by the index in the set
return index.toString(36);
}
/**
* @param {?*} children Children tree container.
* @param {!string} nameSoFar Name of the key path so far.
* @param {!function} callback Callback to invoke with each child found.
* @param {?*} traverseContext Used to pass information throughout the traversal
* process.
* @return {!number} The number of children in this subtree.
*/
function traverseAllChildrenImpl(children, nameSoFar, callback, traverseContext) {
var type = typeof children;
if (type === 'undefined' || type === 'boolean') {
// All of the above are perceived as null.
children = null;
}
if (children === null || type === 'string' || type === 'number' ||
// The following is inlined from ReactElement. This means we can optimize
// some checks. React Fiber also inlines this logic for similar purposes.
type === 'object' && children.$$typeof === REACT_ELEMENT_TYPE) {
callback(traverseContext, children,
// If it's the only child, treat the name as if it was wrapped in an array
// so that it's consistent if the number of children grows.
nameSoFar === '' ? SEPARATOR + getComponentKey(children, 0) : nameSoFar);
return 1;
}
var child;
var nextName;
var subtreeCount = 0; // Count of children found in the current subtree.
var nextNamePrefix = nameSoFar === '' ? SEPARATOR : nameSoFar + SUBSEPARATOR;
if (Array.isArray(children)) {
for (var i = 0; i < children.length; i++) {
child = children[i];
nextName = nextNamePrefix + getComponentKey(child, i);
subtreeCount += traverseAllChildrenImpl(child, nextName, callback, traverseContext);
}
} else {
var iteratorFn = getIteratorFn(children);
if (iteratorFn) {
var iterator = iteratorFn.call(children);
var step;
if (iteratorFn !== children.entries) {
var ii = 0;
while (!(step = iterator.next()).done) {
child = step.value;
nextName = nextNamePrefix + getComponentKey(child, ii++);
subtreeCount += traverseAllChildrenImpl(child, nextName, callback, traverseContext);
}
} else {
if (process.env.NODE_ENV !== 'production') {
var mapsAsChildrenAddendum = '';
if (ReactCurrentOwner.current) {
var mapsAsChildrenOwnerName = ReactCurrentOwner.current.getName();
if (mapsAsChildrenOwnerName) {
mapsAsChildrenAddendum = ' Check the render method of `' + mapsAsChildrenOwnerName + '`.';
}
}
process.env.NODE_ENV !== 'production' ? warning(didWarnAboutMaps, 'Using Maps as children is not yet fully supported. It is an ' + 'experimental feature that might be removed. Convert it to a ' + 'sequence / iterable of keyed ReactElements instead.%s', mapsAsChildrenAddendum) : void 0;
didWarnAboutMaps = true;
}
// Iterator will provide entry [k,v] tuples rather than values.
while (!(step = iterator.next()).done) {
var entry = step.value;
if (entry) {
child = entry[1];
nextName = nextNamePrefix + KeyEscapeUtils.escape(entry[0]) + SUBSEPARATOR + getComponentKey(child, 0);
subtreeCount += traverseAllChildrenImpl(child, nextName, callback, traverseContext);
}
}
}
} else if (type === 'object') {
var addendum = '';
if (process.env.NODE_ENV !== 'production') {
addendum = ' If you meant to render a collection of children, use an array ' + 'instead or wrap the object using createFragment(object) from the ' + 'React add-ons.';
if (children._isReactElement) {
addendum = " It looks like you're using an element created by a different " + 'version of React. Make sure to use only one copy of React.';
}
if (ReactCurrentOwner.current) {
var name = ReactCurrentOwner.current.getName();
if (name) {
addendum += ' Check the render method of `' + name + '`.';
}
}
}
var childrenString = String(children);
!false ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Objects are not valid as a React child (found: %s).%s', childrenString === '[object Object]' ? 'object with keys {' + Object.keys(children).join(', ') + '}' : childrenString, addendum) : _prodInvariant('31', childrenString === '[object Object]' ? 'object with keys {' + Object.keys(children).join(', ') + '}' : childrenString, addendum) : void 0;
}
}
return subtreeCount;
}
/**
* Traverses children that are typically specified as `props.children`, but
* might also be specified through attributes:
*
* - `traverseAllChildren(this.props.children, ...)`
* - `traverseAllChildren(this.props.leftPanelChildren, ...)`
*
* The `traverseContext` is an optional argument that is passed through the
* entire traversal. It can be used to store accumulations or anything else that
* the callback might find relevant.
*
* @param {?*} children Children tree object.
* @param {!function} callback To invoke upon traversing each child.
* @param {?*} traverseContext Context for traversal.
* @return {!number} The number of children in this subtree.
*/
function traverseAllChildren(children, callback, traverseContext) {
if (children == null) {
return 0;
}
return traverseAllChildrenImpl(children, '', callback, traverseContext);
}
module.exports = traverseAllChildren;
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