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PhabricatorHigherOrderChartFunction.php
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			<?php

			abstract class PhabricatorHigherOrderChartFunction
			extends PhabricatorChartFunction {

			public function getDomain() {
			$domains = array();
			foreach ($this->getFunctionArguments() as $function) {
			$domains[] = $function->getDomain();
			}

			return PhabricatorChartInterval::newFromIntervalList($domains);
			}

			public function newInputValues(PhabricatorChartDataQuery $query) {
			$map = array();
			foreach ($this->getFunctionArguments() as $function) {
			$xv = $function->newInputValues($query);
			if ($xv !== null) {
			foreach ($xv as $x) {
			$map[$x] = true;
			}
			}
			}

			if (!$map) {
			return null;
			}

			ksort($map);

			return array_keys($map);
			}

			public function getDataRefs(array $xv) {
			$refs = array();

			foreach ($this->getFunctionArguments() as $function) {
			$function_refs = $function->getDataRefs($xv);

			$function_refs = array_select_keys($function_refs, $xv);
			if (!$function_refs) {
			continue;
			}

			foreach ($function_refs as $x => $ref_list) {
			if (!isset($refs[$x])) {
			$refs[$x] = array();
			}
			foreach ($ref_list as $ref) {
			$refs[$x][] = $ref;
			}
			}
			}

			return $refs;
			}

			public function loadRefs(array $refs) {
			$results = array();

			foreach ($this->getFunctionArguments() as $function) {
			$results += $function->loadRefs($refs);
			}

			return $results;
			}

			}