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ExpressionLanguageProvider.php
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ExpressionLanguageProvider.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\DependencyInjection;
use Symfony\Component\DependencyInjection\Exception\LogicException;
use Symfony\Component\ExpressionLanguage\ExpressionFunction;
use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
/**
* Define some ExpressionLanguage functions.
*
* To get a service, use service('request').
* To get a parameter, use parameter('kernel.debug').
* To get an env variable, use env('SOME_VARIABLE').
*
* @author Fabien Potencier <[email protected]>
*/
class ExpressionLanguageProvider implements ExpressionFunctionProviderInterface
{
private ?\Closure $serviceCompiler;
private ?\Closure $getEnv;
public function __construct(?callable $serviceCompiler = null, ?\Closure $getEnv = null)
{
$this->serviceCompiler = null === $serviceCompiler ? null : $serviceCompiler(...);
$this->getEnv = $getEnv;
}
public function getFunctions(): array
{
return [
new ExpressionFunction('service', $this->serviceCompiler ?? fn ($arg) => sprintf('$container->get(%s)', $arg), fn (array $variables, $value) => $variables['container']->get($value)),
new ExpressionFunction('parameter', fn ($arg) => sprintf('$container->getParameter(%s)', $arg), fn (array $variables, $value) => $variables['container']->getParameter($value)),
new ExpressionFunction('env', fn ($arg) => sprintf('$container->getEnv(%s)', $arg), function (array $variables, $value) {
if (!$this->getEnv) {
throw new LogicException('You need to pass a getEnv closure to the expression language provider to use the "env" function.');
}
return ($this->getEnv)($value);
}),
new ExpressionFunction('arg', fn ($arg) => sprintf('$args?->get(%s)', $arg), fn (array $variables, $value) => $variables['args']?->get($value)),
];
}
}