PhabricatorPhurlLinkRemarkupRule.php
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	<?php

	final class PhabricatorPhurlLinkRemarkupRule extends PhutilRemarkupRule {

	public function getPriority() {
	return 200.0;
	}

	public function apply($text) {
	// `((123))` remarkup link to `/u/123`
	// `((alias))` remarkup link to `/u/alias`
	return preg_replace_callback(
	'/$\(([^ )]+)$\)/',
	array($this, 'markupLink'),
	$text);
	}

	public function markupLink(array $matches) {
	$engine = $this->getEngine();
	$viewer = $engine->getConfig('viewer');

	$text_mode = $engine->isTextMode();
	$html_mode = $engine->isHTMLMailMode();

	if (!$this->isFlatText($matches[0])) {
	return $matches[0];
	}

	$ref = $matches[1];
	$monogram = null;
	$is_monogram = '/^U(?P<id>[1-9]\d*)/';

	$query = id(new PhabricatorPhurlURLQuery())
	->setViewer($viewer);

	if (preg_match($is_monogram, $ref, $monogram)) {
	$query->withIDs(array($monogram[1]));
	} else if (ctype_digit($ref)) {
	$query->withIDs(array($ref));
	} else {
	$query->withAliases(array($ref));
	}

	$phurl = $query->executeOne();
	if (!$phurl) {
	return $matches[0];
	}

	$uri = $phurl->getRedirectURI();
	$name = $phurl->getDisplayName();

	if ($text_mode \|\| $html_mode) {
	$uri = PhabricatorEnv::getProductionURI($uri);
	}

	if ($text_mode) {
	return pht(
	'%s <%s>',
	$name,
	$uri);
	} else {
	$link = phutil_tag(
	'a',
	array(
	'href' => $uri,
	'target' => '_blank',
	),
	$name);
	}

	return $this->getEngine()->storeText($link);
	}

	}