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	diff --git a/src/applications/files/document/render/PhabricatorDocumentRenderingEngine.php b/src/applications/files/document/render/PhabricatorDocumentRenderingEngine.php
	index f43689bbba..c664e56b6d 100644
	--- a/src/applications/files/document/render/PhabricatorDocumentRenderingEngine.php
	+++ b/src/applications/files/document/render/PhabricatorDocumentRenderingEngine.php
	@@ -1,344 +1,344 @@
	<?php

	abstract class PhabricatorDocumentRenderingEngine
	extends Phobject {

	private $request;
	private $controller;
	private $activeEngine;
	private $ref;

	final public function setRequest(AphrontRequest $request) {
	$this->request = $request;
	return $this;
	}

	final public function getRequest() {
	if (!$this->request) {
	throw new PhutilInvalidStateException('setRequest');
	}

	return $this->request;
	}

	final public function setController(PhabricatorController $controller) {
	$this->controller = $controller;
	return $this;
	}

	final public function getController() {
	if (!$this->controller) {
	throw new PhutilInvalidStateException('setController');
	}

	return $this->controller;
	}

	final protected function getActiveEngine() {
	return $this->activeEngine;
	}

	final protected function getRef() {
	return $this->ref;
	}

	final public function newDocumentView(PhabricatorDocumentRef $ref) {
	$request = $this->getRequest();
	$viewer = $request->getViewer();

	$engines = PhabricatorDocumentEngine::getEnginesForRef($viewer, $ref);

	$engine_key = $this->getSelectedDocumentEngineKey();
	if (!isset($engines[$engine_key])) {
	$engine_key = head_key($engines);
	}
	$engine = $engines[$engine_key];

	$lines = $this->getSelectedLineRange();
	if ($lines) {
	$engine->setHighlightedLines(range($lines[0], $lines[1]));
	}

	$encode_setting = $request->getStr('encode');
	if (phutil_nonempty_string($encode_setting)) {
	$engine->setEncodingConfiguration($encode_setting);
	}

	$highlight_setting = $request->getStr('highlight');
	if (phutil_nonempty_string($highlight_setting)) {
	$engine->setHighlightingConfiguration($highlight_setting);
	}

	$blame_setting = ($request->getStr('blame') !== 'off');
	$engine->setBlameConfiguration($blame_setting);

	$views = array();
	foreach ($engines as $candidate_key => $candidate_engine) {
	$label = $candidate_engine->getViewAsLabel($ref);
	if ($label === null) {
	continue;
	}

	$view_uri = $this->newRefViewURI($ref, $candidate_engine);

	$view_icon = $candidate_engine->getViewAsIconIcon($ref);
	$view_color = $candidate_engine->getViewAsIconColor($ref);
	$loading = $candidate_engine->newLoadingContent($ref);

	$views[] = array(
	'viewKey' => $candidate_engine->getDocumentEngineKey(),
	'icon' => $view_icon,
	'color' => $view_color,
	'name' => $label,
	'engineURI' => $this->newRefRenderURI($ref, $candidate_engine),
	'viewURI' => $view_uri,
	'loadingMarkup' => hsprintf('%s', $loading),
	'canEncode' => $candidate_engine->canConfigureEncoding($ref),
	'canHighlight' => $candidate_engine->canConfigureHighlighting($ref),
	'canBlame' => $candidate_engine->canBlame($ref),
	);
	}

	$viewport_id = celerity_generate_unique_node_id();
	$control_id = celerity_generate_unique_node_id();
	$icon = $engine->newDocumentIcon($ref);

	$config = array(
	'controlID' => $control_id,
	);

	$this->willStageRef($ref);

	if ($engine->shouldRenderAsync($ref)) {
	$content = $engine->newLoadingContent($ref);
	$config['next'] = 'render';
	} else {
	$this->willRenderRef($ref);
	$content = $engine->newDocument($ref);

	if ($engine->canBlame($ref)) {
	$config['next'] = 'blame';
	}
	}

	Javelin::initBehavior('document-engine', $config);

	$viewport = phutil_tag(
	'div',
	array(
	'id' => $viewport_id,
	),
	$content);

	$meta = array(
	'viewportID' => $viewport_id,
	'viewKey' => $engine->getDocumentEngineKey(),
	'views' => $views,
	'encode' => array(
	'icon' => 'fa-font',
	'name' => pht('Change Text Encoding...'),
	'uri' => '/services/encoding/',
	'value' => $encode_setting,
	),
	'highlight' => array(
	'icon' => 'fa-lightbulb-o',
	'name' => pht('Highlight As...'),
	'uri' => '/services/highlight/',
	'value' => $highlight_setting,
	),
	'blame' => array(
	'icon' => 'fa-backward',
	'hide' => pht('Hide Blame'),
	'show' => pht('Show Blame'),
	'uri' => $ref->getBlameURI(),
	'enabled' => $blame_setting,
	'value' => null,
	),
	'coverage' => array(
	'labels' => array(
	// TODO: Modularize this properly, see T13125.
	array(
	'C' => pht('Covered'),
	'U' => pht('Not Covered'),
	'N' => pht('Not Executable'),
	'X' => pht('Not Reachable'),
	),
	),
	),
	);

	$view_button = id(new PHUIButtonView())
	->setTag('a')
	->setText(pht('View Options'))
	->setIcon('fa-file-image-o')
	->setColor(PHUIButtonView::GREY)
	->setID($control_id)
	->setMetadata($meta)
	->setDropdown(true)
	->addSigil('document-engine-view-dropdown');

	$header = id(new PHUIHeaderView())
	->setHeaderIcon($icon)
	->setHeader($ref->getName())
	->addActionLink($view_button);

	return id(new PHUIObjectBoxView())
	->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
	->setHeader($header)
	->appendChild($viewport);
	}

	final public function newRenderResponse(PhabricatorDocumentRef $ref) {
	$this->willStageRef($ref);
	$this->willRenderRef($ref);

	$request = $this->getRequest();
	$viewer = $request->getViewer();

	$engines = PhabricatorDocumentEngine::getEnginesForRef($viewer, $ref);
	$engine_key = $this->getSelectedDocumentEngineKey();
	if (!isset($engines[$engine_key])) {
	return $this->newErrorResponse(
	pht(
	'The engine ("%s") is unknown, or unable to render this document.',
	$engine_key));
	}
	$engine = $engines[$engine_key];

	$this->activeEngine = $engine;

	$encode_setting = $request->getStr('encode');
	- if (strlen($encode_setting)) {
	+ if (phutil_nonempty_string($encode_setting)) {
	$engine->setEncodingConfiguration($encode_setting);
	}

	$highlight_setting = $request->getStr('highlight');
	- if (strlen($highlight_setting)) {
	+ if (phutil_nonempty_string($highlight_setting)) {
	$engine->setHighlightingConfiguration($highlight_setting);
	}

	$blame_setting = ($request->getStr('blame') !== 'off');
	$engine->setBlameConfiguration($blame_setting);

	try {
	$content = $engine->newDocument($ref);
	} catch (Exception $ex) {
	return $this->newErrorResponse($ex->getMessage());
	}

	return $this->newContentResponse($content);
	}

	public function newErrorResponse($message) {
	$container = phutil_tag(
	'div',
	array(
	'class' => 'document-engine-error',
	),
	array(
	id(new PHUIIconView())
	->setIcon('fa-exclamation-triangle red'),
	' ',
	$message,
	));

	return $this->newContentResponse($container);
	}

	private function newContentResponse($content) {
	$request = $this->getRequest();
	$viewer = $request->getViewer();
	$controller = $this->getController();

	if ($request->isAjax()) {
	return id(new AphrontAjaxResponse())
	->setContent(
	array(
	'markup' => hsprintf('%s', $content),
	));
	}

	$crumbs = $this->newCrumbs();
	$crumbs->setBorder(true);

	$content_frame = id(new PHUIObjectBoxView())
	->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
	->appendChild($content);

	$page_frame = id(new PHUITwoColumnView())
	->setFooter($content_frame);

	$title = array();
	$ref = $this->getRef();
	if ($ref) {
	$title = array(
	$ref->getName(),
	pht('Standalone'),
	);
	} else {
	$title = pht('Document');
	}

	return $controller->newPage()
	->setCrumbs($crumbs)
	->setTitle($title)
	->appendChild($page_frame);
	}

	protected function newCrumbs() {
	$engine = $this->getActiveEngine();
	$controller = $this->getController();

	$crumbs = $controller->buildApplicationCrumbsForEditEngine();

	$ref = $this->getRef();

	$this->addApplicationCrumbs($crumbs, $ref);

	if ($ref) {
	$label = $engine->getViewAsLabel($ref);
	if ($label) {
	$crumbs->addTextCrumb($label);
	}
	}

	return $crumbs;
	}

	public function getRefViewURI(
	PhabricatorDocumentRef $ref,
	PhabricatorDocumentEngine $engine) {
	return $this->newRefViewURI($ref, $engine);
	}

	abstract protected function newRefViewURI(
	PhabricatorDocumentRef $ref,
	PhabricatorDocumentEngine $engine);

	abstract protected function newRefRenderURI(
	PhabricatorDocumentRef $ref,
	PhabricatorDocumentEngine $engine);

	protected function getSelectedDocumentEngineKey() {
	return $this->getRequest()->getURIData('engineKey');
	}

	protected function getSelectedLineRange() {
	return $this->getRequest()->getURILineRange('lines', 1000);
	}

	protected function addApplicationCrumbs(
	PHUICrumbsView $crumbs,
	PhabricatorDocumentRef $ref = null) {
	return;
	}

	protected function willStageRef(PhabricatorDocumentRef $ref) {
	return;
	}

	protected function willRenderRef(PhabricatorDocumentRef $ref) {
	return;
	}

	}

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