DiffusionLowLevelParentsQuery.php
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DiffusionLowLevelParentsQuery.php
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	<?php

	final class DiffusionLowLevelParentsQuery
	extends DiffusionLowLevelQuery {

	private $identifier;

	public function withIdentifier($identifier) {
	$this->identifier = $identifier;
	return $this;
	}

	protected function executeQuery() {
	if (!strlen($this->identifier)) {
	throw new PhutilInvalidStateException('withIdentifier');
	}

	$type = $this->getRepository()->getVersionControlSystem();
	switch ($type) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	$result = $this->loadGitParents();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$result = $this->loadMercurialParents();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	$result = $this->loadSubversionParents();
	break;
	default:
	throw new Exception(pht('Unsupported repository type "%s"!', $type));
	}

	return $result;
	}

	private function loadGitParents() {
	$repository = $this->getRepository();

	list($stdout) = $repository->execxLocalCommand(
	'log -n 1 %s %s --',
	'--format=%P',
	gitsprintf('%s', $this->identifier));

	return preg_split('/\s+/', trim($stdout));
	}

	private function loadMercurialParents() {
	$repository = $this->getRepository();

	$hg_analyzer = PhutilBinaryAnalyzer::getForBinary('hg');
	if ($hg_analyzer->isMercurialTemplatePnodeAvailable()) {
	$hg_log_template = '{p1.node} {p2.node}';
	} else {
	$hg_log_template = '{p1node} {p2node}';
	}

	list($stdout) = $repository->execxLocalCommand(
	'log --limit 1 --template %s --rev %s',
	$hg_log_template,
	$this->identifier);

	$hashes = preg_split('/\s+/', trim($stdout));
	foreach ($hashes as $key => $value) {
	// We get 40-character hashes but also get the "000000..." hash for
	// missing parents; ignore it.
	if (preg_match('/^0+\z/', $value)) {
	unset($hashes[$key]);
	}
	}

	return $hashes;
	}

	private function loadSubversionParents() {
	$repository = $this->getRepository();
	$identifier = $this->identifier;

	$refs = id(new DiffusionCachedResolveRefsQuery())
	->setRepository($repository)
	->withRefs(array($identifier))
	->execute();
	if (!$refs) {
	throw new Exception(
	pht(
	'No commit "%s" in this repository.',
	$identifier));
	}

	$n = (int)$identifier;
	if ($n > 1) {
	$ids = array($n - 1);
	} else {
	$ids = array();
	}

	return $ids;
	}

	}

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