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PhutilLibraryMapRegistry.php
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Wed, Jan 8, 05:58

PhutilLibraryMapRegistry.php
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<?php
/*
* Copyright 2011 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.
*/
class PhutilLibraryMapRegistry {
protected static $map = array();
protected static $library;
public static function findDescendantsOfClass($class) {
foreach (array_keys(__phutil_library_registry('list')) as $library) {
if (empty(self::$map[$library])) {
self::loadLibraryMap($library);
}
}
$children = array();
foreach (self::$map as $library => $map) {
foreach ($map['requires_class'] as $child => $parent) {
if ($parent == $class) {
$children[] = $child;
}
}
foreach ($map['requires_interface'] as $child => $parent) {
if ($parent == $class) {
$children[] = $child;
}
}
}
$descendants = array(
$children,
);
foreach ($children as $child) {
$descendants[] = self::findDescendantsOfClass($child);
}
return call_user_func_array('array_merge', $descendants);
}
public static function findClassesDeclaredInModule($library, $module) {
if (empty(self::$map[$library])) {
$map = self::loadLibraryMap($library);
} else {
$map = self::$map[$library];
}
$results = array();
foreach ($map['class'] as $class => $declared) {
if ($declared == $module) {
$results[] = $class;
}
}
return $results;
}
public static function register(array $map) {
self::$map[self::$library] = $map;
}
public static function loadLibraryMap($library) {
if (!empty(self::$map[$library])) {
return self::$map[$library];
}
self::$library = $library;
$root = __phutil_library_registry('find', $library);
$okay = @include_once $root.'/__phutil_library_map__.php';
if (!$okay) {
throw new Exception("Unable to load library map for '{$library}'.");
}
return self::$map[$library];
}
public static function findClass($library, $class, $search = true) {
return self::findSymbolOfType('class', $library, $class, $search);
}
public static function findFunction($library, $function, $search = true) {
return self::findSymbolOfType('function', $library, $function, $search);
}
public static function findSymbolOfType($type, $library, $symbol, $search) {
if ($library) {
$map = self::loadLibraryMap($library);
if (isset($map[$library][$type][$symbol])) {
return self::getSpec($type, $library, $symbol);
}
}
if (!$search) {
return false;
}
foreach (self::$map as $library => $map) {
if (isset($map[$type][$symbol])) {
return self::getSpec($type, $library, $symbol);
}
}
foreach (array_keys(__phutil_library_registry('list')) as $library) {
if (empty(self::$map[$library])) {
$map = self::loadLibraryMap($library);
if (isset($map[$type][$symbol])) {
return self::getSpec($type, $library, $symbol);
}
}
}
return false;
}
private static function getSpec($type, $library, $symbol) {
if ($type == 'function') {
return self::getFunctionSpec($library, $symbol);
} else {
return self::getClassSpec($library, $symbol);
}
}
private static function getFunctionSpec($library, $function) {
$map = self::$map[$library];
return array(
'library' => $library,
'module' => $map['function'][$function],
);
}
private static function getClassSpec($library, $class) {
$map = self::$map[$library];
$module = $map['class'][$class];
$parent = null;
$interface = array();
if (!empty($map['requires_class'][$class])) {
$parent = $map['requires_class'][$class];
}
if (!empty($map['requires_interface'][$class])) {
$interface = $map['requires_interface'][$class];
}
return array(
'library' => $library,
'module' => $module,
'requires_class' => $parent,
'requires_interface' => $interface,
);
}
}

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