PhutilRemarkupRuleDocumentLink.php
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	<?php

	/**
	* @group markup
	*/
	final class PhutilRemarkupRuleDocumentLink
	extends PhutilRemarkupRule {

	public function apply($text) {

	$text = preg_replace_callback(
	'@\B\\[\\[([^\|\\]]+)(?:\\\|([^\\]]+))?\\]\\]\B@U',
	array($this, 'markupDocumentLink'),
	$text);

	return $text;
	}

	protected function renderHyperlink($link, $name) {
	return phutil_render_tag(
	'a',
	array(
	'href' => $link,
	'target' => '_blank',
	),
	phutil_escape_html($name));
	}

	public function markupDocumentLink($matches) {
	$uri = trim($matches[1]);
	$name = trim(idx($matches, 2, $uri));

	// If whatever is being linked to begins with "/" or has "://", treat it
	// as a URI instead of a wiki page.
	$is_uri = preg_match('@(^/)\|(://)@', $uri);

	if ($is_uri && strncmp('/', $uri, 1)) {
	$protocols = $this->getEngine()->getConfig(
	'uri.allowed-protocols',
	array());
	$protocol = id(new PhutilURI($uri))->getProtocol();
	if (!idx($protocols, $protocol)) {
	// Don't treat this as a URI if it's not an allowed protocol.
	$is_uri = false;
	}
	}

	if (!$is_uri) {
	return $matches[0];
	}

	return $this->getEngine()->storeText($this->renderHyperlink($uri, $name));
	}

	}