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55 lines
1.6 KiB
55 lines
1.6 KiB
10 years ago
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/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule flattenChildren
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*/
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'use strict';
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var traverseAllChildren = require("./traverseAllChildren");
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var warning = require("./warning");
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/**
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* @param {function} traverseContext Context passed through traversal.
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* @param {?ReactComponent} child React child component.
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* @param {!string} name String name of key path to child.
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*/
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function flattenSingleChildIntoContext(traverseContext, child, name) {
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// We found a component instance.
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var result = traverseContext;
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var keyUnique = !result.hasOwnProperty(name);
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if ("production" !== process.env.NODE_ENV) {
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("production" !== process.env.NODE_ENV ? warning(
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keyUnique,
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'flattenChildren(...): Encountered two children with the same key, ' +
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'`%s`. Child keys must be unique; when two children share a key, only ' +
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'the first child will be used.',
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name
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) : null);
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}
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if (keyUnique && child != null) {
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result[name] = child;
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}
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}
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/**
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* Flattens children that are typically specified as `props.children`. Any null
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* children will not be included in the resulting object.
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* @return {!object} flattened children keyed by name.
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*/
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function flattenChildren(children) {
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if (children == null) {
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return children;
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}
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var result = {};
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traverseAllChildren(children, flattenSingleChildIntoContext, result);
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return result;
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}
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module.exports = flattenChildren;
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