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<?php
/**
* This file is part of the Fedora Autoloader package.
*
* (c) Shawn Iwinski <shawn@iwin.ski> and Remi Collet <remi@fedoraproject.org>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Fedora\Autoloader;
class Dependencies
{
/* Already loaded dependencies */
public static $_loaded = array();
/**
* Static functions only.
*/
private function __construct()
{
}
/**
* Processes dependencies to require/load.
*
* - If dependency is not an array:
* - If dependency is required, it is only required/loaded if it exists,
* otherwise a `\RuntimeException` is thrown.
* - If dependency is not required, it is only required/loaded if it exists.
* - If dependency is an array:
* - Loops through all items until the first item that exists is found and
* then it is required/loaded. If no item is found and the dependency
* is required, the last item will be required/loaded if it exists,
* otherwise a `\RuntimeException` is thrown.
*
* See README for examples.
*
* @param array $dependencies Dependencies
* @param bool $required Whether dependencies are required or not
*
* @throws \RuntimeException If required and no file is successfully loaded
* via {@link requireFile()}
*/
protected static function process(array $dependencies, $required)
{
foreach ($dependencies as $dependency) {
if (is_array($dependency)) {
$dependencyLoaded = false;
foreach ($dependency as $firstExistsDependency) {
if (in_array($firstExistsDependency, self::$_loaded)) {
$dependencyLoaded = true;
break;
}
}
if (!$dependencyLoaded) {
foreach ($dependency as $firstExistsDependency) {
try {
requireFile($firstExistsDependency);
$dependencyLoaded = true;
self::$_loaded[] = $firstExistsDependency;
break;
} catch (\RuntimeException $e) {
}
}
}
if ($required && !$dependencyLoaded) {
throw new \RuntimeException(sprintf(
"Files not found: '%s'",
implode("' || '", $dependency)
));
}
} else {
try {
requireFile($dependency);
self::$_loaded[] = $dependency;
} catch (\RuntimeException $e) {
if ($required) {
throw $e;
}
}
}
}
}
/**
* Requires dependency files.
*
* Calls `process($requiredDependencies, true)`.
*
* @param array $requiredDependencies Required dependencies
*
* @see process()
*/
public static function required(array $requiredDependencies)
{
static::process($requiredDependencies, true);
}
/**
* Optionally requires other dependency files if they exist.
*
* Calls `process($optionalDependencies, false)`.
*
* @param array $optionalDependencies Optional dependencies
*
* @see process()
*/
public static function optional(array $optionalDependencies)
{
static::process($optionalDependencies, false);
}
}