AphrontView.php
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	<?php

	abstract class AphrontView extends Phobject
	implements PhutilSafeHTMLProducerInterface {

	protected $user;
	protected $children = array();

	public function setUser(PhabricatorUser $user) {
	$this->user = $user;
	return $this;
	}

	protected function getUser() {
	return $this->user;
	}

	protected function canAppendChild() {
	return true;
	}

	final public function appendChild($child) {
	if (!$this->canAppendChild()) {
	$class = get_class($this);
	throw new Exception(
	pht("View '%s' does not support children.", $class));
	}
	$this->children[] = $child;
	return $this;
	}

	final protected function renderChildren() {
	return $this->children;
	}

	/**
	* @deprecated
	*/
	final protected function renderSingleView($child) {
	phutil_deprecated(
	'AphrontView->renderSingleView()',
	"This method no longer does anything; it can be removed and replaced ".
	"with its arguments.");
	return $child;
	}

	final protected function isEmptyContent($content) {
	if (is_array($content)) {
	foreach ($content as $element) {
	if (!$this->isEmptyContent($element)) {
	return false;
	}
	}
	return true;
	} else {
	return !strlen((string)$content);
	}
	}

	abstract public function render();

	public function producePhutilSafeHTML() {
	return $this->render();
	}

	}