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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);
			}

			}