react/packages/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
 */

import type {Fiber} from 'react-reconciler/src/ReactFiber';

import {
  IndeterminateComponent,
  FunctionalComponent,
  ClassComponent,
  HostComponent,
} from './ReactTypeOfWork';
import describeComponentFrame from './describeComponentFrame';
import getComponentName from './getComponentName';

function describeFiber(fiber: Fiber): string {
  switch (fiber.tag) {
    case IndeterminateComponent:
    case FunctionalComponent:
    case ClassComponent:
    case HostComponent:
      const owner = fiber._debugOwner;
      const source = fiber._debugSource;
      const name = getComponentName(fiber);
      let 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.
export function getStackAddendumByWorkInProgressFiber(
  workInProgress: Fiber,
): string {
  let info = '';
  let node = workInProgress;
  do {
    info += describeFiber(node);
    // Otherwise this return pointer might point to the wrong tree:
    node = node.return;
  } while (node);
  return info;
}