ArcanistCommitGraphSetTreeView.php
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	<?php

	final class ArcanistCommitGraphSetTreeView
	extends Phobject {

	private $repositoryAPI;
	private $rootSet;
	private $markers;
	private $markerGroups;
	private $stateRefs;
	private $setViews;

	public function setRootSet($root_set) {
	$this->rootSet = $root_set;
	return $this;
	}

	public function getRootSet() {
	return $this->rootSet;
	}

	public function setMarkers($markers) {
	$this->markers = $markers;
	$this->markerGroups = mgroup($markers, 'getCommitHash');
	return $this;
	}

	public function getMarkers() {
	return $this->markers;
	}

	public function setStateRefs($state_refs) {
	$this->stateRefs = $state_refs;
	return $this;
	}

	public function getStateRefs() {
	return $this->stateRefs;
	}

	public function setRepositoryAPI($repository_api) {
	$this->repositoryAPI = $repository_api;
	return $this;
	}

	public function getRepositoryAPI() {
	return $this->repositoryAPI;
	}

	public function draw() {
	$set = $this->getRootSet();

	$this->setViews = array();
	$view_root = $this->newSetViews($set);
	$view_list = $this->setViews;

	$api = $this->getRepositoryAPI();

	foreach ($view_list as $view) {
	$view_set = $view->getSet();
	$hashes = $view_set->getHashes();

	$commit_refs = $this->getCommitRefs($hashes);
	$revision_refs = $this->getRevisionRefs(head($hashes));
	$marker_refs = $this->getMarkerRefs($hashes);

	$view
	->setRepositoryAPI($api)
	->setCommitRefs($commit_refs)
	->setRevisionRefs($revision_refs)
	->setMarkerRefs($marker_refs);
	}

	$view_list = $this->collapseViews($view_root, $view_list);

	$rows = array();
	foreach ($view_list as $view) {
	$rows[] = $view->newCellViews();
	}

	return $rows;
	}

	private function newSetViews(ArcanistCommitGraphSet $set) {
	$set_view = $this->newSetView($set);

	$this->setViews[] = $set_view;

	foreach ($set->getDisplayChildSets() as $child_set) {
	$child_view = $this->newSetViews($child_set);
	$child_view->setParentView($set_view);
	$set_view->addChildView($child_view);
	}

	return $set_view;
	}

	private function newSetView(ArcanistCommitGraphSet $set) {
	return id(new ArcanistCommitGraphSetView())
	->setSet($set);
	}

	private function getStateRef($hash) {
	$state_refs = $this->getStateRefs();

	if (!isset($state_refs[$hash])) {
	throw new Exception(
	pht(
	'Found no state ref for hash "%s".',
	$hash));
	}

	return $state_refs[$hash];
	}

	private function getRevisionRefs($hash) {
	$state_ref = $this->getStateRef($hash);
	return $state_ref->getRevisionRefs();
	}

	private function getCommitRefs(array $hashes) {
	$results = array();
	foreach ($hashes as $hash) {
	$state_ref = $this->getStateRef($hash);
	$results[$hash] = $state_ref->getCommitRef();
	}

	return $results;
	}

	private function getMarkerRefs(array $hashes) {
	$results = array();
	foreach ($hashes as $hash) {
	$results[$hash] = idx($this->markerGroups, $hash, array());
	}
	return $results;
	}

	private function collapseViews($view_root, array $view_list) {
	$this->groupViews($view_root);

	foreach ($view_list as $view) {
	$group = $view->getGroupView();
	$group->addMemberView($view);
	}

	foreach ($view_list as $view) {
	$member_views = $view->getMemberViews();

	// Break small groups apart.
	$count = count($member_views);
	if ($count > 1 && $count < 4) {
	foreach ($member_views as $member_view) {
	$member_view->setGroupView($member_view);
	$member_view->setMemberViews(array($member_view));
	}
	}
	}

	foreach ($view_list as $view) {
	$parent_view = $view->getParentView();
	if (!$parent_view) {
	$depth = 0;
	} else {
	$parent_group = $parent_view->getGroupView();

	$member_views = $parent_group->getMemberViews();
	if (count($member_views) > 1) {
	$depth = $parent_group->getViewDepth() + 2;
	} else {
	$depth = $parent_group->getViewDepth() + 1;
	}
	}

	$view->setViewDepth($depth);
	}

	foreach ($view_list as $key => $view) {
	if (!$view->getMemberViews()) {
	unset($view_list[$key]);
	}
	}

	return $view_list;
	}

	private function groupViews($view) {
	$group_view = $this->getGroupForView($view);
	$view->setGroupView($group_view);



	$children = $view->getChildViews();
	foreach ($children as $child) {
	$this->groupViews($child);
	}
	}

	private function getGroupForView($view) {
	$revision_refs = $view->getRevisionRefs();
	if ($revision_refs) {
	$has_unpublished_revision = false;

	foreach ($revision_refs as $revision_ref) {
	if (!$revision_ref->isStatusPublished()) {
	$has_unpublished_revision = true;
	break;
	}
	}

	if ($has_unpublished_revision) {
	return $view;
	}
	}

	$marker_lists = $view->getMarkerRefs();
	foreach ($marker_lists as $marker_refs) {
	if ($marker_refs) {
	return $view;
	}
	}

	// If a view has no children, it is never grouped with other views.
	$children = $view->getChildViews();
	if (!$children) {
	return $view;
	}

	// If a view is a root, we can't group it.
	$parent = $view->getParentView();
	if (!$parent) {
	return $view;
	}

	// If a view has siblings, we can't group it with other views.
	$siblings = $parent->getChildViews();
	if (count($siblings) !== 1) {
	return $view;
	}

	// The view has no children and no other siblings, so add it to the
	// parent's group.
	return $parent->getGroupView();
	}

	}

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