Function setKey

chapter18/docs/d3-graphviz.js:1015–1043

(datum, index)

    var nodeDictionary = {};
    var prevNodeDictionary = this._nodeDictionary || {};
    function setKey(datum, index) {
      var tag = datum.tag;
      if (keyMode == 'index') {
        datum.key = index;
      } else if (tag[0] != '#') {
        if (keyMode == 'id') {
          datum.key = datum.attributes.id;
        } else if (keyMode == 'title') {
          var title = datum.children.find(function (childData) {
            return childData.tag == 'title';
          });
          if (title) {
            if (title.children.length > 0) {
              datum.key = title.children[0].text;
            } else {
              datum.key = '';
            }
          }
        }
      }
      if (datum.key == null) {
        if (tweenShapes) {
          if (tag == 'ellipse' || tag == 'polygon') {
            tag = 'path';
          }
        }
        datum.key = tag + '-' + index;
      }
    }
    function setId(datum, parentData) {
      var id = (parentData ? parentData.id + '.' : '') + datum.key;
      datum.id = id;