Viewing github.com/facebook/react/fixtures/fiber-debugger/src/Fibers.js

```
import React from 'react';
```

import {Motion, spring} from 'react-motion';

```
import dagre from 'dagre';
```

// import prettyFormat from 'pretty-format';

// import reactElement from 'pretty-format/plugins/ReactElement';

```
function getFiberColor(fibers, id) {
```

  if (fibers.currentIDs.indexOf(id) > -1) {

```
    return 'lightgreen';
```
```
  }
```

  if (id === fibers.workInProgressID) {

```
    return 'yellow';
```
```
  }
```
```
  return 'lightyellow';
```
```
}
```
```
function Graph(props) {
```

  const {rankdir, trackActive} = props.settings;

```
  var g = new dagre.graphlib.Graph();
```
```
  g.setGraph({
```
```
    width: 1000,
```
```
    height: 1000,
```
```
    nodesep: 50,
```
```
    edgesep: 150,
```
```
    ranksep: 100,
```
```
    marginx: 100,
```
```
    marginy: 100,
```
```
    rankdir,
```
```
  });
```
```
  var edgeLabels = {};
```

  React.Children.forEach(props.children, function (child) {

```
    if (!child) {
```
```
      return;
```
```
    }
```
```
    if (child.type.isVertex) {
```
```
      g.setNode(child.key, {
```
```
        label: child,
```
```
        width: child.props.width,
```
```
        height: child.props.height,
```
```
      });
```
```
    } else if (child.type.isEdge) {
```

      const relationshipKey = child.props.source + ':' + child.props.target;

      if (!edgeLabels[relationshipKey]) {

        edgeLabels[relationshipKey] = [];

```
      }
```

      edgeLabels[relationshipKey].push(child);

```
    }
```
```
  });
```

  Object.keys(edgeLabels).forEach(key => {

```
    const children = edgeLabels[key];
```
```
    const child = children[0];
```

    g.setEdge(child.props.source, child.props.target, {

```
      label: child,
```

      allChildren: children.map(c => c.props.children),

```
      weight: child.props.weight,
```
```
    });
```
```
  });
```
```
  dagre.layout(g);
```
```
  var activeNode = g
```
```
    .nodes()
```
```
    .map(v => g.node(v))
```

    .find(node => node.label.props.isActive);

  const [winX, winY] = [window.innerWidth / 2, window.innerHeight / 2];

  var focusDx = trackActive && activeNode ? winX - activeNode.x : 0;

  var focusDy = trackActive && activeNode ? winY - activeNode.y : 0;

```
  var nodes = g.nodes().map(v => {
```
```
    var node = g.node(v);
```
```
    return (
```
```
      <Motion
```
```
        style={{
```

          x: props.isDragging ? node.x + focusDx : spring(node.x + focusDx),

          y: props.isDragging ? node.y + focusDy : spring(node.y + focusDy),

```
        }}
```
```
        key={node.label.key}>
```
```
        {interpolatingStyle =>
```

          React.cloneElement(node.label, {

            x: interpolatingStyle.x + props.dx,

            y: interpolatingStyle.y + props.dy,

```
            vanillaX: node.x,
```
```
            vanillaY: node.y,
```
```
          })
```
```
        }
```
```
      </Motion>
```
```
    );
```
```
  });
```
```
  var edges = g.edges().map(e => {
```
```
    var edge = g.edge(e);
```
```
    let idx = 0;
```
```
    return (
```
```
      <Motion
```

        style={edge.points.reduce((bag, point) => {

          bag[idx + ':x'] = props.isDragging

```
            ? point.x + focusDx
```

            : spring(point.x + focusDx);

          bag[idx + ':y'] = props.isDragging

```
            ? point.y + focusDy
```

            : spring(point.y + focusDy);

```
          idx++;
```
```
          return bag;
```
```
        }, {})}
```
```
        key={edge.label.key}>
```
```
        {interpolatedStyle => {
```
```
          let points = [];
```

          Object.keys(interpolatedStyle).forEach(key => {

            const [idx, prop] = key.split(':');

```
            if (!points[idx]) {
```

              points[idx] = {x: props.dx, y: props.dy};

```
            }
```

            points[idx][prop] += interpolatedStyle[key];

```
          });
```

          return React.cloneElement(edge.label, {

```
            points,
```
```
            id: edge.label.key,
```

            children: edge.allChildren.join(', '),

```
          });
```
```
        }}
```
```
      </Motion>
```
```
    );
```
```
  });
```
```
  return (
```
```
    <div
```
```
      style={{
```
```
        position: 'relative',
```
```
        height: '100%',
```
```
      }}>
```
```
      {edges}
```
```
      {nodes}
```
```
    </div>
```
```
  );
```
```
}
```
```
function Vertex(props) {
```

  if (Number.isNaN(props.x) || Number.isNaN(props.y)) {

```
    return null;
```
```
  }
```
```
  return (
```
```
    <div
```
```
      style={{
```
```
        position: 'absolute',
```
```
        border: '1px solid black',
```

        left: props.x - props.width / 2,

        top: props.y - props.height / 2,

```
        width: props.width,
```
```
        height: props.height,
```
```
        overflow: 'hidden',
```
```
        padding: '4px',
```
```
        wordWrap: 'break-word',
```
```
      }}>
```
```
      {props.children}
```
```
    </div>
```
```
  );
```
```
}
```
```
Vertex.isVertex = true;
```
```
const strokes = {
```
```
  alt: 'blue',
```
```
  child: 'green',
```
```
  sibling: 'darkgreen',
```
```
  return: 'red',
```
```
  fx: 'purple',
```
```
};
```
```
function Edge(props) {
```
```
  var points = props.points;
```

  var path = 'M' + points[0].x + ' ' + points[0].y + ' ';

```
  if (!points[0].x || !points[0].y) {
```
```
    return null;
```
```
  }
```

  for (var i = 1; i < points.length; i++) {

    path += 'L' + points[i].x + ' ' + points[i].y + ' ';

    if (!points[i].x || !points[i].y) {

```
      return null;
```
```
    }
```
```
  }
```
```
  var lineID = props.id;
```
```
  return (
```
```
    <svg
```
```
      width="100%"
```
```
      height="100%"
```
```
      style={{
```
```
        position: 'absolute',
```
```
        left: 0,
```
```
        right: 0,
```
```
        top: 0,
```
```
        bottom: 0,
```
```
      }}>
```
```
      <defs>
```
```
        <path d={path} id={lineID} />
```
```
        <marker
```
```
          id="markerCircle"
```
```
          markerWidth="8"
```
```
          markerHeight="8"
```
```
          refX="5"
```
```
          refY="5">
```

          <circle cx="5" cy="5" r="3" style={{stroke: 'none', fill: 'black'}} />

```
        </marker>
```
```
        <marker
```
```
          id="markerArrow"
```
```
          markerWidth="13"
```
```
          markerHeight="13"
```
```
          refX="2"
```
```
          refY="6"
```
```
          orient="auto">
```

          <path d="M2,2 L2,11 L10,6 L2,2" style={{fill: 'black'}} />

```
        </marker>
```
```
      </defs>
```
```
      <use
```
```
        xlinkHref={`#${lineID}`}
```
```
        fill="none"
```
```
        stroke={strokes[props.kind]}
```
```
        style={{
```

          markerStart: 'url(#markerCircle)',

          markerEnd: 'url(#markerArrow)',

```
        }}
```
```
      />
```
```
      <text>
```

        <textPath xlinkHref={`#${lineID}`}>

```
          {'     '}
```
```
          {props.children}
```
```
        </textPath>
```
```
      </text>
```
```
    </svg>
```
```
  );
```
```
}
```
```
Edge.isEdge = true;
```
```
function formatPriority(priority) {
```
```
  switch (priority) {
```
```
    case 1:
```
```
      return 'synchronous';
```
```
    case 2:
```
```
      return 'task';
```
```
    case 3:
```
```
      return 'hi-pri work';
```
```
    case 4:
```
```
      return 'lo-pri work';
```
```
    case 5:
```
```
      return 'offscreen work';
```
```
    default:
```

      throw new Error('Unknown priority.');

```
  }
```
```
}
```

export default function Fibers({fibers, show, graphSettings, ...rest}) {

  const items = Object.keys(fibers.descriptions).map(

```
    id => fibers.descriptions[id]
```
```
  );
```

  const isDragging = rest.className.indexOf('dragging') > -1;

```
  const [_, sdx, sdy] =
```

    rest.style.transform.match(/translate\((-?\d+)px,(-?\d+)px\)/) || [];

```
  const dx = Number(sdx);
```
```
  const dy = Number(sdy);
```
```
  return (
```
```
    <div
```
```
      {...rest}
```
```
      style={{
```
```
        width: '100%',
```
```
        height: '100%',
```
```
        position: 'absolute',
```
```
        top: 0,
```
```
        left: 0,
```
```
        ...rest.style,
```
```
        transform: null,
```
```
      }}>
```
```
      <Graph
```
```
        className="graph"
```
```
        dx={dx}
```
```
        dy={dy}
```
```
        isDragging={isDragging}
```
```
        settings={graphSettings}>
```
```
        {items.map(fiber => [
```
```
          <Vertex
```
```
            key={fiber.id}
```
```
            width={150}
```
```
            height={100}
```

            isActive={fiber.id === fibers.workInProgressID}>

```
            <div
```
```
              style={{
```
```
                width: '100%',
```
```
                height: '100%',
```

                backgroundColor: getFiberColor(fibers, fiber.id),

```
              }}
```
```
              title={
```

                /*prettyFormat(fiber, { plugins: [reactElement ]})*/

                'todo: this was hanging last time I tried to pretty print'

```
              }>
```
```
              <small>
```

                {fiber.tag} #{fiber.id}

```
              </small>
```
```
              <br />
```
```
              {fiber.type}
```
```
              <br />
```

              {fibers.currentIDs.indexOf(fiber.id) === -1 ? (

```
                <small>
```

                  {fiber.pendingWorkPriority !== 0 && [

```
                    <span key="span">
```

                      Needs: {formatPriority(fiber.pendingWorkPriority)}

```
                    </span>,
```
```
                    <br key="br" />,
```
```
                  ]}
```

                  {fiber.memoizedProps !== null &&

                    fiber.pendingProps !== null && [

                      fiber.memoizedProps === fiber.pendingProps

                        ? 'Can reuse memoized.'

                        : 'Cannot reuse memoized.',

```
                      <br key="br" />,
```
```
                    ]}
```
```
                </small>
```
```
              ) : (
```

                <small>Committed</small>

```
              )}
```
```
              {fiber.flags && [
```
```
                <br key="br" />,
```

                <small key="small">Effect: {fiber.flags}</small>,

```
              ]}
```
```
            </div>
```
```
          </Vertex>,
```

          fiber.child && show.child && (

```
            <Edge
```
```
              source={fiber.id}
```
```
              target={fiber.child}
```
```
              kind="child"
```
```
              weight={1000}
```

              key={`${fiber.id}-${fiber.child}-child`}>

```
              child
```
```
            </Edge>
```
```
          ),
```

          fiber.sibling && show.sibling && (

```
            <Edge
```
```
              source={fiber.id}
```
```
              target={fiber.sibling}
```
```
              kind="sibling"
```
```
              weight={2000}
```

              key={`${fiber.id}-${fiber.sibling}-sibling`}>

```
              sibling
```
```
            </Edge>
```
```
          ),
```

          fiber.return && show.return && (

```
            <Edge
```
```
              source={fiber.id}
```
```
              target={fiber.return}
```
```
              kind="return"
```
```
              weight={1000}
```

              key={`${fiber.id}-${fiber.return}-return`}>

```
              return
```
```
            </Edge>
```
```
          ),
```

          fiber.nextEffect && show.fx && (

```
            <Edge
```
```
              source={fiber.id}
```

              target={fiber.nextEffect}

```
              kind="fx"
```
```
              weight={100}
```

              key={`${fiber.id}-${fiber.nextEffect}-nextEffect`}>

```
              nextFx
```
```
            </Edge>
```
```
          ),
```

          fiber.firstEffect && show.fx && (

```
            <Edge
```
```
              source={fiber.id}
```

              target={fiber.firstEffect}

```
              kind="fx"
```
```
              weight={100}
```

              key={`${fiber.id}-${fiber.firstEffect}-firstEffect`}>

```
              firstFx
```
```
            </Edge>
```
```
          ),
```

          fiber.lastEffect && show.fx && (

```
            <Edge
```
```
              source={fiber.id}
```

              target={fiber.lastEffect}

```
              kind="fx"
```
```
              weight={100}
```

              key={`${fiber.id}-${fiber.lastEffect}-lastEffect`}>

```
              lastFx
```
```
            </Edge>
```
```
          ),
```

          fiber.alternate && show.alt && (

```
            <Edge
```
```
              source={fiber.id}
```
```
              target={fiber.alternate}
```
```
              kind="alt"
```
```
              weight={10}
```

              key={`${fiber.id}-${fiber.alternate}-alt`}>

```
              alt
```
```
            </Edge>
```
```
          ),
```
```
        ])}
```
```
      </Graph>
```
```
    </div>
```
```
  );
```
```
}
```