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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 (nodeByKeyValue.has(keyValue = key.call(node = group[i], 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 (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};
}