DiffusionSourceLinkRemarkupRule.php
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	<?php

	final class DiffusionSourceLinkRemarkupRule
	extends PhutilRemarkupRule {

	const KEY_SOURCELINKS = 'diffusion.links';

	public function getPriority() {
	return 200.0;
	}

	public function apply($text) {
	return preg_replace_callback(
	'@{(?:src\|source)\b((?:[^}\\\\]+\|\\\\.)*)}@m',
	array($this, 'markupSourceLink'),
	$text);
	}

	public function markupSourceLink(array $matches) {
	$engine = $this->getEngine();
	$text_mode = $engine->isTextMode();
	$mail_mode = $engine->isHTMLMailMode();

	if (!$this->isFlatText($matches[0]) \|\| $text_mode \|\| $mail_mode) {
	// We could do better than this in text mode and mail mode, but focus
	// on web mode first.
	return $matches[0];
	}

	$metadata_key = self::KEY_SOURCELINKS;
	$metadata = $engine->getTextMetadata($metadata_key, array());

	$token = $engine->storeText($matches[0]);

	$metadata[] = array(
	'token' => $token,
	'raw' => $matches[0],
	'input' => $matches[1],
	);

	$engine->setTextMetadata($metadata_key, $metadata);

	return $token;
	}

	public function didMarkupText() {
	$engine = $this->getEngine();
	$metadata_key = self::KEY_SOURCELINKS;
	$metadata = $engine->getTextMetadata($metadata_key, array());

	if (!$metadata) {
	return;
	}

	$viewer = $engine->getConfig('viewer');
	if (!$viewer) {
	return;
	}

	$defaults = array(
	'repository' => null,
	'line' => null,
	'commit' => null,
	'ref' => null,
	);

	$tags = array();
	foreach ($metadata as $ref) {
	$token = $ref['token'];
	$raw = $ref['raw'];
	$input = $ref['input'];

	$pattern =
	'(^'.
	'[\s,]*'.
	'(?:"(?P<quotedpath>(?:[^\\\\"]+\|\\.)+)"\|(?P<rawpath>[^\s,]+))'.
	'[\s,]*'.
	'(?P<options>.*)'.
	'\z)';
	$matches = null;
	if (!preg_match($pattern, $input, $matches)) {
	$hint_text = pht(
	'Missing path, expected "{src path ...}" in: %s',
	$raw);
	$hint = $this->newSyntaxHint($hint_text);

	$engine->overwriteStoredText($token, $hint);
	continue;
	}

	$path = idx($matches, 'rawpath');
	if (!strlen($path)) {
	$path = idx($matches, 'quotedpath');
	$path = stripcslashes($path);
	}

	$parts = explode(':', $path, 2);
	if (count($parts) == 2) {
	$repository = nonempty($parts[0], null);
	$path = $parts[1];
	} else {
	$repository = null;
	$path = $parts[0];
	}

	$options = $matches['options'];

	$parser = new PhutilSimpleOptions();
	$options = $parser->parse($options) + $defaults;

	foreach ($options as $key => $value) {
	if (!array_key_exists($key, $defaults)) {
	$hint_text = pht(
	'Unknown option "%s" in: %s',
	$key,
	$raw);
	$hint = $this->newSyntaxHint($hint_text);

	$engine->overwriteStoredText($token, $hint);
	continue 2;
	}
	}

	if ($options['repository'] !== null) {
	$repository = $options['repository'];
	}

	if ($repository === null) {
	$hint_text = pht(
	'Missing repository, expected "{src repository:path ...}" '.
	'or "{src path repository=...}" in: %s',
	$raw);
	$hint = $this->newSyntaxHint($hint_text);

	$engine->overwriteStoredText($token, $hint);
	continue;
	}

	$tags[] = array(
	'token' => $token,
	'raw' => $raw,
	'identifier' => $repository,
	'path' => $path,
	'options' => $options,
	);
	}

	if (!$tags) {
	return;
	}

	$query = id(new PhabricatorRepositoryQuery())
	->setViewer($viewer)
	->withIdentifiers(ipull($tags, 'identifier'));

	$query->execute();

	$repository_map = $query->getIdentifierMap();

	foreach ($tags as $tag) {
	$token = $tag['token'];

	$identifier = $tag['identifier'];
	$repository = idx($repository_map, $identifier);
	if (!$repository) {
	// For now, just bail out here. Ideally, we should distingiush between
	// restricted and invalid repositories.
	continue;
	}

	$drequest = DiffusionRequest::newFromDictionary(
	array(
	'user' => $viewer,
	'repository' => $repository,
	));

	$options = $tag['options'];

	$line = $options['line'];
	$commit = $options['commit'];
	$ref_name = $options['ref'];

	$link_uri = $drequest->generateURI(
	array(
	'action' => 'browse',
	'path' => $tag['path'],
	'commit' => $commit,
	'line' => $line,
	'branch' => $ref_name,
	));

	$view = id(new DiffusionSourceLinkView())
	->setRepository($repository)
	->setPath($tag['path'])
	->setURI($link_uri);

	if ($line !== null) {
	$view->setLine($line);
	}

	if ($commit !== null) {
	$view->setCommit($commit);
	}

	if ($ref_name !== null) {
	$view->setRefName($ref_name);
	}

	$engine->overwriteStoredText($token, $view);
	}
	}

	private function newSyntaxHint($text) {
	return id(new PHUITagView())
	->setType(PHUITagView::TYPE_SHADE)
	->setColor('red')
	->setIcon('fa-exclamation-triangle')
	->setName($text);
	}

	}

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