all files / lib/util/ CopyPasteUtil.js

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import {
  forEach
} from 'min-dash';
 
 
export function getTopLevel(elements) {
  var topLevel = {},
      parents = [],
      result = [],
      clearedParents = [];
 
  forEach(elements, function(element) {
    var parent = element.parent;
 
    if (!topLevel[parent.id]) {
      topLevel[parent.id] = [];
    }
 
    if (parents.indexOf(parent.id) === -1) {
      parents.push(parent.id);
    }
 
    topLevel[parent.id].push(element);
  });
 
  forEach(parents, function(parent) {
    forEach(topLevel[parent], function(element) {
      if (topLevel[element.id]) {
        clearedParents.push(element.id);
      }
    });
  });
 
  forEach(parents, function(parent) {
    var idx = clearedParents.indexOf(parent);
 
    if (idx === -1) {
      result = result.concat(topLevel[parent]);
    }
  });
 
  return result;
}