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	diff --git a/scripts/celerity_mapper.php b/scripts/celerity_mapper.php
	index 8580567016..a9f4313822 100755
	--- a/scripts/celerity_mapper.php
	+++ b/scripts/celerity_mapper.php
	@@ -1,299 +1,303 @@
	#!/usr/bin/env php
	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	$package_spec = array(
	'javelin.pkg.js' => array(
	'javelin-util',
	'javelin-install',
	'javelin-event',
	'javelin-stratcom',
	'javelin-behavior',
	'javelin-request',
	'javelin-vector',
	'javelin-dom',
	'javelin-json',
	'javelin-uri',
	),
	'typeahead.pkg.js' => array(
	'javelin-typeahead',
	'javelin-typeahead-normalizer',
	'javelin-typeahead-source',
	'javelin-typeahead-preloaded-source',
	'javelin-typeahead-ondemand-source',
	'javelin-tokenizer',
	'javelin-behavior-aphront-basic-tokenizer',
	),
	'core.pkg.js' => array(
	'javelin-mask',
	'javelin-workflow',
	'javelin-behavior-workflow',
	'javelin-behavior-aphront-form-disable-on-submit',
	'phabricator-keyboard-shortcut-manager',
	'phabricator-keyboard-shortcut',
	'javelin-behavior-phabricator-keyboard-shortcuts',
	'javelin-behavior-refresh-csrf',
	'javelin-behavior-phabricator-watch-anchor',
	'javelin-behavior-phabricator-autofocus',
	'phabricator-paste-file-upload',
	'phabricator-menu-item',
	'phabricator-dropdown-menu',
	),
	'core.pkg.css' => array(
	'phabricator-core-css',
	'phabricator-core-buttons-css',
	'phabricator-standard-page-view',
	'aphront-dialog-view-css',
	'aphront-form-view-css',
	'aphront-panel-view-css',
	'aphront-side-nav-view-css',
	'aphront-table-view-css',
	'aphront-crumbs-view-css',
	'aphront-tokenizer-control-css',
	'aphront-typeahead-control-css',
	'aphront-list-filter-view-css',

	'phabricator-directory-css',
	'phabricator-jump-nav',
	'phabricator-app-buttons-css',

	'phabricator-remarkup-css',
	'syntax-highlighting-css',
	'aphront-pager-view-css',
	'phabricator-transaction-view-css',
	),
	'differential.pkg.css' => array(
	'differential-core-view-css',
	'differential-changeset-view-css',
	'differential-revision-detail-css',
	'differential-revision-history-css',
	'differential-table-of-contents-css',
	'differential-revision-comment-css',
	'differential-revision-add-comment-css',
	'differential-revision-comment-list-css',
	'phabricator-object-selector-css',
	'aphront-headsup-action-list-view-css',
	'phabricator-content-source-view-css',
	'differential-local-commits-view-css',
	),
	'differential.pkg.js' => array(
	'phabricator-drag-and-drop-file-upload',
	'phabricator-shaped-request',

	'javelin-behavior-differential-feedback-preview',
	'javelin-behavior-differential-edit-inline-comments',
	'javelin-behavior-differential-populate',
	'javelin-behavior-differential-show-more',
	'javelin-behavior-differential-diff-radios',
	'javelin-behavior-differential-accept-with-errors',
	'javelin-behavior-differential-comment-jump',
	'javelin-behavior-differential-add-reviewers-and-ccs',
	'javelin-behavior-differential-keyboard-navigation',
	'javelin-behavior-aphront-drag-and-drop',
	'javelin-behavior-aphront-drag-and-drop-textarea',
	'javelin-behavior-phabricator-object-selector',

	'differential-inline-comment-editor',
	'javelin-behavior-differential-dropdown-menus',
	'javelin-behavior-buoyant',
	),
	'diffusion.pkg.css' => array(
	'diffusion-commit-view-css',
	),
	'maniphest.pkg.css' => array(
	'maniphest-task-summary-css',
	'maniphest-transaction-detail-css',
	'maniphest-task-detail-css',
	'aphront-attached-file-view-css',
	),
	'maniphest.pkg.js' => array(
	'javelin-behavior-maniphest-batch-selector',
	'javelin-behavior-maniphest-transaction-controls',
	'javelin-behavior-maniphest-transaction-preview',
	'javelin-behavior-maniphest-transaction-expand',
	),
	);


	require_once dirname(__FILE__).'/__init_script__.php';

	if ($argc != 2) {
	$self = basename($argv[0]);
	echo "usage: {$self} <webroot>\n";
	exit(1);
	}

	phutil_require_module('phutil', 'filesystem');
	phutil_require_module('phutil', 'filesystem/filefinder');
	phutil_require_module('phutil', 'future/exec');
	phutil_require_module('phutil', 'parser/docblock');

	$root = Filesystem::resolvePath($argv[1]);

	echo "Finding static resources...\n";
	$files = id(new FileFinder($root))
	->withType('f')
	->withSuffix('js')
	->withSuffix('css')
	->withFollowSymlinks(true)
	->setGenerateChecksums(true)
	->find();

	echo "Processing ".count($files)." files";

	$resource_hash = PhabricatorEnv::getEnvConfig('celerity.resource-hash');

	$file_map = array();
	foreach ($files as $path => $hash) {
	echo ".";
	$name = '/'.Filesystem::readablePath($path, $root);
	$file_map[$name] = array(
	'hash' => md5($hash.$name.$resource_hash),
	'disk' => $path,
	);
	}
	echo "\n";

	$runtime_map = array();
	$resource_graph = array();
	$hash_map = array();

	$parser = new PhutilDocblockParser();
	foreach ($file_map as $path => $info) {
	$data = Filesystem::readFile($info['disk']);
	$matches = array();
	$ok = preg_match('@/[][].?[]/@s', $data, $matches);
	if (!$ok) {
	throw new Exception(
	"File {$path} does not have a header doc comment. Encode dependency ".
	"data in a header docblock.");
	}

	list($description, $metadata) = $parser->parse($matches[0]);

	$provides = preg_split('/\s+/', trim(idx($metadata, 'provides')));
	$requires = preg_split('/\s+/', trim(idx($metadata, 'requires')));
	$provides = array_filter($provides);
	$requires = array_filter($requires);

	+ if (!$provides) {
	+ // Tests and documentation-only JS is permitted to @provide no targets.
	+ continue;
	+ }
	+
	if (count($provides) > 1) {
	- // NOTE: Documentation-only JS is permitted to @provide no targets.
	throw new Exception(
	"File {$path} must @provide at most one Celerity target.");
	}

	$provides = reset($provides);

	$type = 'js';
	if (preg_match('/\.css$/', $path)) {
	$type = 'css';
	}

	$uri = '/res/'.substr($info['hash'], 0, 8).$path;

	$hash_map[$provides] = $info['hash'];

	$resource_graph[$provides] = $requires;

	$runtime_map[$provides] = array(
	'uri' => $uri,
	'type' => $type,
	'requires' => $requires,
	'disk' => $path,
	);
	}

	$celerity_resource_graph = new CelerityResourceGraph();
	$celerity_resource_graph->addNodes($resource_graph);
	$celerity_resource_graph->setResourceGraph($resource_graph);
	$celerity_resource_graph->loadGraph();

	foreach ($resource_graph as $provides => $requires) {
	$cycle = $celerity_resource_graph->detectCycles($provides);
	if ($cycle) {
	throw new Exception(
	"Cycle detected in resource graph: ". implode($cycle, " => ")
	);
	}
	}

	$package_map = array();
	foreach ($package_spec as $name => $package) {
	$hashes = array();
	$type = null;
	foreach ($package as $symbol) {
	if (empty($hash_map[$symbol])) {
	throw new Exception(
	"Package specification for '{$name}' includes '{$symbol}', but that ".
	"symbol is not defined anywhere.");
	}
	if ($type === null) {
	$type = $runtime_map[$symbol]['type'];
	} else {
	$ntype = $runtime_map[$symbol]['type'];
	if ($type !== $ntype) {
	throw new Exception(
	"Package specification for '{$name}' mixes resources of type ".
	"'{$type}' with resources of type '{$ntype}'. Each package may only ".
	"contain one type of resource.");
	}
	}
	$hashes[] = $symbol.':'.$hash_map[$symbol];
	}
	$key = substr(md5(implode("\n", $hashes)), 0, 8);
	$package_map['packages'][$key] = array(
	'name' => $name,
	'symbols' => $package,
	'uri' => '/res/pkg/'.$key.'/'.$name,
	'type' => $type,
	);
	foreach ($package as $symbol) {
	$package_map['reverse'][$symbol] = $key;
	}
	}

	ksort($runtime_map);
	$runtime_map = var_export($runtime_map, true);
	$runtime_map = preg_replace('/\s+$/m', '', $runtime_map);
	$runtime_map = preg_replace('/array \(/', 'array(', $runtime_map);

	ksort($package_map['packages']);
	ksort($package_map['reverse']);
	$package_map = var_export($package_map, true);
	$package_map = preg_replace('/\s+$/m', '', $package_map);
	$package_map = preg_replace('/array \(/', 'array(', $package_map);

	$generated = '@'.'generated';
	$resource_map = <<<EOFILE
	<?php

	/**
	* This file is automatically generated. Use 'celerity_mapper.php' to rebuild
	* it.
	* {$generated}
	*/

	celerity_register_resource_map({$runtime_map}, {$package_map});

	EOFILE;

	echo "Writing map...\n";
	Filesystem::writeFile(
	$root.'/../src/__celerity_resource_map__.php',
	$resource_map);
	echo "Done.\n";

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