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PhutilSymbolLoader.php
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Sat, Aug 17, 12:21

PhutilSymbolLoader.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.
*/
/**
* Query and load Phutil classes, interfaces and functions. PhutilSymbolLoader
* is a query object which selects symbols which satisfy certain criteria, and
* optionally loads them. For instance, to load all classes in a module:
*
* id(new PhutilSymbolLoader())
* ->setType('class')
* ->setLibrary('example')
* ->setModule('some/module')
* ->selectAndLoadSymbols();
*
* @group library
*/
final class PhutilSymbolLoader {
private $type;
private $library;
private $base;
private $module;
private $name;
private $suppressLoad;
public function setType($type) {
$this->type = $type;
return $this;
}
public function setLibrary($library) {
// Validate the library name; this throws if the library in not loaded.
$bootloader = PhutilBootloader::getInstance();
$bootloader->getLibraryRoot($library);
$this->library = $library;
return $this;
}
public function setModule($module) {
$this->module = $module;
return $this;
}
public function setName($name) {
$this->name = $name;
return $this;
}
public function setAncestorClass($base) {
$this->base = $base;
return $this;
}
public function selectSymbolsWithoutLoading() {
$this->suppressLoad = true;
$result = $this->selectAndLoadSymbols();
$this->suppressLoad = false;
return $result;
}
public function selectAndLoadSymbols() {
$map = array();
$bootloader = PhutilBootloader::getInstance();
if ($this->library) {
$libraries = array($this->library);
} else {
$libraries = $bootloader->getAllLibraries();
}
if ($this->type) {
$types = array($this->type);
} else {
$types = array(
'class',
'function',
);
}
$symbols = array();
foreach ($libraries as $library) {
$map = $bootloader->getLibraryMap($library);
foreach ($types as $type) {
foreach ($map[$type] as $name => $module) {
if ($this->name && ($name != $this->name)) {
continue;
}
if ($this->module && ($module != $this->module)) {
continue;
}
$symbol = array(
'type' => $type,
'name' => $name,
'library' => $library,
'module' => $module,
);
if (!empty($map['requires_class'][$name])) {
$symbol['requires_class'] = $map['requires_class'][$name];
}
if (!empty($map['requires_interface'][$name])) {
$symbol['requires_interface'] = $map['requires_interface'][$name];
}
$symbols[$type.'$'.$name] = $symbol;
}
}
}
if ($this->base) {
$tree = array();
$libraries = $bootloader->getAllLibraries();
foreach ($libraries as $library) {
$map = $bootloader->getLibraryMap($library);
foreach ($map['requires_class'] as $child => $parent) {
$tree[$parent][] = $child;
}
foreach ($map['requires_interface'] as $child => $parents) {
foreach ($parents as $parent) {
$tree[$parent][] = $child;
}
}
}
$names = $this->selectDescendantsOf($tree, $this->base);
foreach ($symbols as $symbol_key => $symbol) {
$type = $symbol['type'];
if ($type == 'class' || $type == 'interface') {
if (isset($names[$symbol['name']])) {
continue;
}
}
unset($symbols[$symbol_key]);
}
}
if (!$this->suppressLoad) {
foreach ($symbols as $symbol) {
$this->loadSymbol($symbol);
}
}
return $symbols;
}
private function selectDescendantsOf($tree, $root) {
$result = array();
foreach ($tree[$root] as $child) {
$result[$child] = true;
if (!empty($tree[$child])) {
$result += $this->selectDescendantsOf($tree, $child);
}
}
return $result;
}
public static function loadClass($class_name) {
$symbols = id(new PhutilSymbolLoader())
->setType('class')
->setName($class_name)
->selectAndLoadSymbols();
if (!$symbols) {
throw new PhutilMissingSymbolException($class_name);
}
}
private function loadSymbol(array $symbol_spec) {
if ($symbol_spec['type'] == 'function') {
$this->loadFunctionSymbol($symbol_spec);
} else {
$this->loadClassOrInterfaceSymbol($symbol_spec);
}
}
private function loadFunctionSymbol(array $symbol_spec) {
$name = $symbol_spec['name'];
if (function_exists($name)) {
return;
}
$bootloader = PhutilBootloader::getInstance();
$bootloader->loadModule($symbol_spec['library'], $symbol_spec['module']);
if (!function_exists($name)) {
throw new PhutilMissingSymbolException($name);
}
}
private function loadClassOrInterfaceSymbol(array $symbol_spec) {
$name = $symbol_spec['name'];
if (class_exists($name, false) || interface_exists($name, false)) {
return;
}
$bootloader = PhutilBootloader::getInstance();
$bootloader->loadModule($symbol_spec['library'], $symbol_spec['module']);
if (!class_exists($name, false) && !interface_exists($name, false)) {
throw new PhutilMissingSymbolException($name);
}
}
}

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