AphrontView.php
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	<?php

	abstract class AphrontView extends Phobject {

	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(
	"View '{$class}' does not support children.");
	}
	$this->children[] = $child;
	return $this;
	}

	final protected function renderChildren() {
	$out = array();
	foreach ($this->children as $child) {
	$out[] = $this->renderSingleView($child);
	}
	return implode('', $out);
	}

	final protected function renderSingleView($child) {
	if ($child instanceof AphrontView) {
	return $child->render();
	} else if (is_array($child)) {
	$out = array();
	foreach ($child as $element) {
	$out[] = $this->renderSingleView($element);
	}
	return implode('', $out);
	} else {
	return $child;
	}
	}

	final protected function renderHTMLView($child) {
	if ($child instanceof AphrontView) {
	return phutil_safe_html($child->render());
	} else if ($child instanceof PhutilSafeHTML) {
	return $child;
	} else if (is_array($child)) {
	$out = array();
	foreach ($child as $element) {
	$out[] = $this->renderHTMLView($element);
	}
	return phutil_safe_html(implode('', $out));
	} else {
	return phutil_safe_html(phutil_escape_html($child));
	}
	}

	abstract public function render();

	}