PhutilSafeHTML.php
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	<?php

	final class PhutilSafeHTML extends Phobject {

	private $content;

	public function __construct($content) {
	$this->content = (string)$content;
	}

	public function __toString() {
	return $this->content;
	}

	public function getHTMLContent() {
	return $this->content;
	}

	public function appendHTML($html /* , ... */) {
	foreach (func_get_args() as $html) {
	$this->content .= phutil_escape_html($html);
	}
	return $this;
	}

	public static function applyFunction($function, $string /* , ... */) {
	$args = func_get_args();
	array_shift($args);
	$args = array_map('phutil_escape_html', $args);
	return new PhutilSafeHTML(call_user_func_array($function, $args));
	}

	// Requires http://pecl.php.net/operator.

	public function __concat($html) {
	$clone = clone $this;
	return $clone->appendHTML($html);
	}

	public function __assign_concat($html) {
	return $this->appendHTML($html);
	}

	}