PhutilInvisibleSyntaxHighlighter.php
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	<?php

	final class PhutilInvisibleSyntaxHighlighter {

	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};");
	}

	}