react/src/shared/ReactFiberComponentTreeHook.js

/**
 * Copyright (c) 2016-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 * @providesModule ReactFiberComponentTreeHook
 */

'use strict';

var ReactTypeOfWork = require('ReactTypeOfWork');
var {
  IndeterminateComponent,
  FunctionalComponent,
  ClassComponent,
  HostComponent,
} = ReactTypeOfWork;
var describeComponentFrame = require('describeComponentFrame');
var getComponentName = require('getComponentName');

import type {Fiber} from 'ReactFiber';

function describeFiber(fiber: Fiber): string {
  switch (fiber.tag) {
    case IndeterminateComponent:
    case FunctionalComponent:
    case ClassComponent:
    case HostComponent:
      var owner = fiber._debugOwner;
      var source = fiber._debugSource;
      var name = getComponentName(fiber);
      var ownerName = null;
      if (owner) {
        ownerName = getComponentName(owner);
      }
      return describeComponentFrame(name, source, ownerName);
    default:
      return '';
  }
}

// This function can only be called with a work-in-progress fiber and
// only during begin or complete phase. Do not call it under any other
// circumstances.
function getStackAddendumByWorkInProgressFiber(workInProgress: Fiber): string {
  var info = '';
  var node = workInProgress;
  do {
    info += describeFiber(node);
    // Otherwise this return pointer might point to the wrong tree:
    node = node.return;
  } while (node);
  return info;
}

module.exports = {
  getStackAddendumByWorkInProgressFiber,
};