kitchensink/examples/node_modules/react/lib/flattenChildren.js

Dispatch's awesome components and style guide

/**
 * 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.
 *
 * @providesModule flattenChildren
 * 
 */

'use strict';

var KeyEscapeUtils = require('./KeyEscapeUtils');
var traverseAllChildren = require('./traverseAllChildren');
var warning = require('fbjs/lib/warning');

/**
 * @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') {
      var ReactComponentTreeDevtool = require('./ReactComponentTreeDevtool');
      process.env.NODE_ENV !== 'production' ? warning(keyUnique, '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), ReactComponentTreeDevtool.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;