DiffusionBrowseQuery.php
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	<?php

	abstract class DiffusionBrowseQuery {

	private $request;

	protected $reason;
	protected $existedAtCommit;
	protected $deletedAtCommit;
	protected $validityOnly;
	private $viewer;

	public function setViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	public function getViewer() {
	return $this->viewer;
	}

	const REASON_IS_FILE = 'is-file';
	const REASON_IS_DELETED = 'is-deleted';
	const REASON_IS_NONEXISTENT = 'nonexistent';
	const REASON_BAD_COMMIT = 'bad-commit';
	const REASON_IS_EMPTY = 'empty';
	const REASON_IS_UNTRACKED_PARENT = 'untracked-parent';

	final private function __construct() {
	// <private>
	}

	final public static function newFromDiffusionRequest(
	DiffusionRequest $request) {

	$repository = $request->getRepository();

	switch ($repository->getVersionControlSystem()) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	// TODO: Verify local-path?
	$query = new DiffusionGitBrowseQuery();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$query = new DiffusionMercurialBrowseQuery();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	$query = new DiffusionSvnBrowseQuery();
	break;
	default:
	throw new Exception("Unsupported VCS!");
	}

	$query->request = $request;

	return $query;
	}

	final protected function getRequest() {
	return $this->request;
	}

	final public function getReasonForEmptyResultSet() {
	return $this->reason;
	}

	final public function getExistedAtCommit() {
	return $this->existedAtCommit;
	}

	final public function getDeletedAtCommit() {
	return $this->deletedAtCommit;
	}

	final public function loadPaths() {
	return $this->executeQuery();
	}

	final public function shouldOnlyTestValidity() {
	return $this->validityOnly;
	}

	final public function needValidityOnly($need_validity_only) {
	$this->validityOnly = $need_validity_only;
	return $this;
	}

	final public function renderReadme(array $results) {
	$drequest = $this->getRequest();

	$readme = null;
	foreach ($results as $result) {
	$file_type = $result->getFileType();
	if (($file_type != ArcanistDiffChangeType::FILE_NORMAL) &&
	($file_type != ArcanistDiffChangeType::FILE_TEXT)) {
	// Skip directories, etc.
	continue;
	}

	$path = $result->getPath();

	if (preg_match('/^readme(\|\.txt\|\.remarkup\|\.rainbow)$/i', $path)) {
	$readme = $result;
	break;
	}
	}

	if (!$readme) {
	return null;
	}

	$readme_request = DiffusionRequest::newFromDictionary(
	array(
	'repository' => $drequest->getRepository(),
	'commit' => $drequest->getStableCommitName(),
	'path' => $readme->getFullPath(),
	));

	$content_query = DiffusionFileContentQuery::newFromDiffusionRequest(
	$readme_request);
	$content_query->setViewer($this->getViewer());
	$content_query->loadFileContent();
	$readme_content = $content_query->getRawData();

	if (preg_match('/\\.txt$/', $readme->getPath())) {
	$readme_content = phutil_escape_html_newlines($readme_content);

	$class = null;
	} else if (preg_match('/\\.rainbow$/', $readme->getPath())) {
	$highlighter = new PhutilRainbowSyntaxHighlighter();
	$readme_content = $highlighter
	->getHighlightFuture($readme_content)
	->resolve();
	$readme_content = phutil_escape_html_newlines($readme_content);

	require_celerity_resource('syntax-highlighting-css');
	$class = 'remarkup-code';
	} else {
	// Markup extensionless files as remarkup so we get links and such.
	$engine = PhabricatorMarkupEngine::newDiffusionMarkupEngine();
	$engine->setConfig('viewer', $this->getViewer());
	$readme_content = $engine->markupText($readme_content);

	$class = 'phabricator-remarkup';
	}

	$readme_content = phutil_tag(
	'div',
	array(
	'class' => $class,
	),
	$readme_content);

	return $readme_content;
	}

	abstract protected function executeQuery();
	}

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