75 lines
2.7 KiB
JavaScript
75 lines
2.7 KiB
JavaScript
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/**
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* Copyright 2013-present, 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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*
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*/
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'use strict';
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var KeyEscapeUtils = require('./KeyEscapeUtils');
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var traverseAllChildren = require('./traverseAllChildren');
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var warning = require('fbjs/lib/warning');
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var ReactComponentTreeHook;
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if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'test') {
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// Temporary hack.
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// Inline requires don't work well with Jest:
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// https://github.com/facebook/react/issues/7240
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// Remove the inline requires when we don't need them anymore:
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// https://github.com/facebook/react/pull/7178
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ReactComponentTreeHook = require('./ReactComponentTreeHook');
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}
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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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* @param {number=} selfDebugID Optional debugID of the current internal instance.
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*/
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function flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID) {
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// We found a component instance.
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if (traverseContext && typeof traverseContext === 'object') {
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var result = traverseContext;
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var keyUnique = result[name] === undefined;
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if (process.env.NODE_ENV !== 'production') {
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if (!ReactComponentTreeHook) {
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ReactComponentTreeHook = require('./ReactComponentTreeHook');
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}
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if (!keyUnique) {
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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;
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}
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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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/**
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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, selfDebugID) {
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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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if (process.env.NODE_ENV !== 'production') {
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traverseAllChildren(children, function (traverseContext, child, name) {
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return flattenSingleChildIntoContext(traverseContext, child, name, selfDebugID);
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}, result);
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} else {
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traverseAllChildren(children, flattenSingleChildIntoContext, result);
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}
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return result;
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}
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module.exports = flattenChildren;
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