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CelerityResourceMap.php
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Mon, Feb 3, 04:43

CelerityResourceMap.php
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<?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.
*/
/**
* Interface to the static resource map, which is a graph of available
* resources, resource dependencies, and packaging information. You generally do
* not need to invoke it directly; instead, you call higher-level Celerity APIs
* and it uses the resource map to satisfy your requests.
*
* @group celerity
*/
final class CelerityResourceMap {
private static $instance;
private $resourceMap;
private $packageMap;
private $reverseMap;
public static function getInstance() {
if (empty(self::$instance)) {
self::$instance = new CelerityResourceMap();
$root = phutil_get_library_root('phabricator');
$path = PhabricatorEnv::getEnvConfig(
'celerity.resource-map',
'__celerity_resource_map__.php');
$ok = include_once Filesystem::resolvePath($path, $root);
if (!$ok) {
throw new Exception("Failed to load Celerity resource map!");
}
}
return self::$instance;
}
public function setResourceMap($resource_map) {
$this->resourceMap = $resource_map;
return $this;
}
public function resolveResources(array $symbols) {
$map = array();
foreach ($symbols as $symbol) {
if (!empty($map[$symbol])) {
continue;
}
$this->resolveResource($map, $symbol);
}
return $map;
}
private function resolveResource(array &$map, $symbol) {
if (empty($this->resourceMap[$symbol])) {
throw new Exception(
"Attempting to resolve unknown Celerity resource, '{$symbol}'.");
}
$info = $this->resourceMap[$symbol];
foreach ($info['requires'] as $requires) {
if (!empty($map[$requires])) {
continue;
}
$this->resolveResource($map, $requires);
}
$map[$symbol] = $info;
}
public function setPackageMap($package_map) {
$this->packageMap = $package_map;
return $this;
}
public function packageResources(array $resolved_map) {
$packaged = array();
$handled = array();
foreach ($resolved_map as $symbol => $info) {
if (isset($handled[$symbol])) {
continue;
}
if (empty($this->packageMap['reverse'][$symbol])) {
$packaged[$symbol] = $info;
} else {
$package = $this->packageMap['reverse'][$symbol];
$package_info = $this->packageMap['packages'][$package];
$packaged[$package_info['name']] = $package_info;
foreach ($package_info['symbols'] as $packaged_symbol) {
$handled[$packaged_symbol] = true;
}
}
}
return $packaged;
}
public function resolvePackage($package_hash) {
$package = idx($this->packageMap['packages'], $package_hash);
if (!$package) {
return null;
}
$paths = array();
foreach ($package['symbols'] as $symbol) {
$paths[] = $this->resourceMap[$symbol]['disk'];
}
return $paths;
}
public function lookupSymbolInformation($symbol) {
return idx($this->resourceMap, $symbol);
}
public function lookupFileInformation($path) {
if (empty($this->reverseMap)) {
$this->reverseMap = array();
foreach ($this->resourceMap as $symbol => $data) {
$data['provides'] = $symbol;
$this->reverseMap[$data['disk']] = $data;
}
}
return idx($this->reverseMap, $path);
}
}

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