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PhutilInvisibleSyntaxHighlighter.php
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			<?php

			final class PhutilInvisibleSyntaxHighlighter extends Phobject {

			private $config = array();

			public function setConfig($key, $value) {
			$this->config[$key] = $value;
			return $this;
			}

			public function getHighlightFuture($source) {
			$keys = array_map('chr', range(0x0, 0x1F));
			$vals = array_map(
			array($this, 'decimalToHtmlEntityDecoded'), range(0x2400, 0x241F));

			$invisible = array_combine($keys, $vals);

			$result = array();
			foreach (str_split($source) as $character) {
			if (isset($invisible[$character])) {
			$result[] = phutil_tag(
			'span',
			array('class' => 'invisible'),
			$invisible[$character]);

			if ($character === "\n") {
			$result[] = $character;
			}
			} else {
			$result[] = $character;
			}
			}

			$result = phutil_implode_html('', $result);
			return new ImmediateFuture($result);
			}

			private function decimalToHtmlEntityDecoded($dec) {
			return html_entity_decode("&#{$dec};");
			}

			}