AphrontView.php
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	<?php

	/*
	* Copyright 2011 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	abstract class AphrontView {

	protected $children = array();

	final public function appendChild($child) {
	$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;
	}
	}

	abstract public function render();

	}