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PhutilLexerSyntaxHighlighter.php
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			<?php

			final class PhutilLexerSyntaxHighlighter extends PhutilSyntaxHighlighter {

			private $config = array();

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

			public function getHighlightFuture($source) {
			$strip = false;
			$state = 'start';
			$lang = idx($this->config, 'language');

			if ($lang == 'php') {
			if (strpos($source, '<?') === false) {
			$state = 'php';
			}
			}

			$lexer = idx($this->config, 'lexer');
			$tokens = $lexer->getTokens($source, $state);
			$tokens = $lexer->mergeTokens($tokens);

			$result = array();
			foreach ($tokens as $token) {
			list($type, $value, $context) = $token;

			$data_name = null;
			switch ($type) {
			case 'nc':
			case 'nf':
			case 'na':
			$data_name = $value;
			break;
			}

			if (strpos($value, "\n") !== false) {
			$value = explode("\n", $value);
			} else {
			$value = array($value);
			}
			foreach ($value as $part) {
			if (strlen($part)) {
			if ($type) {
			$result[] = phutil_tag(
			'span',
			array(
			'class' => $type,
			'data-symbol-context' => $context,
			'data-symbol-name' => $data_name,
			),
			$part);
			} else {
			$result[] = $part;
			}
			}
			$result[] = "\n";
			}

			// Throw away the last "\n".
			array_pop($result);
			}

			$result = phutil_implode_html('', $result);

			return new ImmediateFuture($result);
			}

			}