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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 KeyEscapeUtils = require('./KeyEscapeUtils');
var traverseAllChildren = require('./traverseAllChildren');
var warning = require('fbjs/lib/warning');
var ReactComponentTreeHook;
if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {
// Temporary hack.
// Inline requires don't work well with Jest:
// https://github.com/facebook/react/issues/7240
// Remove the inline requires when we don't need them anymore:
// https://github.com/facebook/react/pull/7178
ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');
}
/**
* @param {function} traverseContext Context passed through traversal.
* @param {?ReactComponent} child React child component.
* @param {!string} name String name of key path to child.
* @param {number=} selfDebugID Optional debugID of the current internal instance.
*/
function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {
// We found a component instance.
if (traverseContext && typeof traverseContext === 'object') {
var result = traverseContext;
var keyUnique = result[name] === undefined;
if (process.env.NODE_ENV !== 'production') {
if (!ReactComponentTreeHook) {
ReactComponentTreeHook = require('react/lib/ReactComponentTreeHook');
}
if (!keyUnique) {
process.env.NODE_ENV !== 'production' ? warning(false, 'flattenChildren(...): Encountered two children with the same key, ' + '`%s`. Child keys must be unique; when two children share a key, only ' + 'the first child will be used.%s', KeyEscapeUtils.unescape(name), ReactComponentTreeHook.getStackAddendumByID(selfDebugID)) : void 0;
}
}
if (keyUnique && child != null) {
result[name] = child;
}
}
}
/**
* Flattens children that are typically specified as `props.children`. Any null
* children will not be included in the resulting object.
* @return {!object} flattened children keyed by name.
*/
function flattenChildren(children, selfDebugID) {
if (children == null) {
return children;
}
var result = {};
if (process.env.NODE_ENV !== 'production') {
traverseAllChildren(children, function (traverseContext, child, name) {
return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);
}, result);
} else {
traverseAllChildren(children, flattenSingleChildIntoContext, result);
}
return result;
}
module.exports = flattenChildren;
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