PhabricatorPHID.php
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	<?php

	final class PhabricatorPHID {

	protected $phid;
	protected $phidType;
	protected $ownerPHID;
	protected $parentPHID;

	public static function generateNewPHID($type, $subtype = null) {
	if (!$type) {
	throw new Exception("Can not generate PHID with no type.");
	}

	if ($subtype === null) {
	$uniq_len = 20;
	$type_str = "{$type}";
	} else {
	$uniq_len = 15;
	$type_str = "{$type}-{$subtype}";
	}

	$uniq = Filesystem::readRandomCharacters($uniq_len);
	return "PHID-{$type_str}-{$uniq}";
	}

	public static function fromObjectName($name) {
	$object = null;
	$match = null;
	if (preg_match('/^PHID-[A-Z]+-.{20}$/', $name)) {
	// It's already a PHID! Yay.
	return $name;
	}
	if (preg_match('/^r([A-Z]+)(\S*)$/', $name, $match)) {
	$repository = id(new PhabricatorRepository())
	->loadOneWhere('callsign = %s', $match[1]);
	if ($match[2] == '') {
	$object = $repository;
	} else if ($repository) {
	$object = id(new PhabricatorRepositoryCommit())->loadOneWhere(
	'repositoryID = %d AND commitIdentifier = %s',
	$repository->getID(),
	$match[2]);
	if (!$object) {
	try {
	$object = id(new PhabricatorRepositoryCommit())->loadOneWhere(
	'repositoryID = %d AND commitIdentifier LIKE %>',
	$repository->getID(),
	$match[2]);
	} catch (AphrontQueryCountException $ex) {
	// Ambiguous; return nothing.
	}
	}
	}
	} else if (preg_match('/^d(\d+)$/i', $name, $match)) {
	$object = id(new DifferentialRevision())->load($match[1]);
	} else if (preg_match('/^t(\d+)$/i', $name, $match)) {
	$object = id(new ManiphestTask())->load($match[1]);
	}
	if ($object) {
	return $object->getPHID();
	}
	return null;
	}
	}