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UserSyncFrontend
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import "../arrays/map";
import "../arrays/set";
import "selection";

d3_selectionPrototype.data = function(value, key) {
  var i = -1,
      n = this.length,
      group,
      node;

  // If no value is specified, return the first value.
  if (!arguments.length) {
    value = new Array(n = (group = this[0]).length);
    while (++i < n) {
      if (node = group[i]) {
        value[i] = node.__data__;
      }
    }
    return value;
  }

  function bind(group, groupData) {
    var i,
        n = group.length,
        m = groupData.length,
        n0 = Math.min(n, m),
        updateNodes = new Array(m),
        enterNodes = new Array(m),
        exitNodes = new Array(n),
        node,
        nodeData;

    if (key) {
      var nodeByKeyValue = new d3_Map,
          keyValues = new Array(n),
          keyValue;

      for (i = -1; ++i < n;) {
        if (node = group[i]) {
          if (nodeByKeyValue.has(keyValue = key.call(node, node.__data__, i))) {
            exitNodes[i] = node; // duplicate selection key
          } else {
            nodeByKeyValue.set(keyValue, node);
          }
          keyValues[i] = keyValue;
        }
      }

      for (i = -1; ++i < m;) {
        if (!(node = nodeByKeyValue.get(keyValue = key.call(groupData, nodeData = groupData[i], i)))) {
          enterNodes[i] = d3_selection_dataNode(nodeData);
        } else if (node !== true) { // no duplicate data key
          updateNodes[i] = node;
          node.__data__ = nodeData;
        }
        nodeByKeyValue.set(keyValue, true);
      }

      for (i = -1; ++i < n;) {
        if (i in keyValues && nodeByKeyValue.get(keyValues[i]) !== true) {
          exitNodes[i] = group[i];
        }
      }
    } else {
      for (i = -1; ++i < n0;) {
        node = group[i];
        nodeData = groupData[i];
        if (node) {
          node.__data__ = nodeData;
          updateNodes[i] = node;
        } else {
          enterNodes[i] = d3_selection_dataNode(nodeData);
        }
      }
      for (; i < m; ++i) {
        enterNodes[i] = d3_selection_dataNode(groupData[i]);
      }
      for (; i < n; ++i) {
        exitNodes[i] = group[i];
      }
    }

    enterNodes.update
        = updateNodes;

    enterNodes.parentNode
        = updateNodes.parentNode
        = exitNodes.parentNode
        = group.parentNode;

    enter.push(enterNodes);
    update.push(updateNodes);
    exit.push(exitNodes);
  }

  var enter = d3_selection_enter([]),
      update = d3_selection([]),
      exit = d3_selection([]);

  if (typeof value === "function") {
    while (++i < n) {
      bind(group = this[i], value.call(group, group.parentNode.__data__, i));
    }
  } else {
    while (++i < n) {
      bind(group = this[i], value);
    }
  }

  update.enter = function() { return enter; };
  update.exit = function() { return exit; };
  return update;
};

function d3_selection_dataNode(data) {
  return {__data__: data};
}