dagre-d3-es/src/dagre-js/label/add-label.js

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import { addHtmlLabel } from './add-html-label.js';
import { addSVGLabel } from './add-svg-label.js';
import { addTextLabel } from './add-text-label.js';

export { addLabel };

function addLabel(root, node, location) {
  var label = node.label;
  var labelSvg = root.append('g');

  // Allow the label to be a string, a function that returns a DOM element, or
  // a DOM element itself.
  if (node.labelType === 'svg') {
    addSVGLabel(labelSvg, node);
  } else if (typeof label !== 'string' || node.labelType === 'html') {
    addHtmlLabel(labelSvg, node);
  } else {
    addTextLabel(labelSvg, node);
  }

  var labelBBox = labelSvg.node().getBBox();
  var y;
  switch (location) {
    case 'top':
      y = -node.height / 2;
      break;
    case 'bottom':
      y = node.height / 2 - labelBBox.height;
      break;
    default:
      y = -labelBBox.height / 2;
  }
  labelSvg.attr('transform', 'translate(' + -labelBBox.width / 2 + ',' + y + ')');

  return labelSvg;
}