php – 如何在Symfony中注册表达式语言

我已经创建了一个具有安全功能的提供程序.在
the doc之后,我创建了自己的ExpressionLanguage类并注册了提供程序.

namespace AppBundle\ExpressionLanguage;

use Symfony\Component\ExpressionLanguage\ExpressionLanguage as BaseExpressionLanguage;
use Symfony\Component\ExpressionLanguage\ParserCache\ParserCacheInterface;

class ExpressionLanguage extends BaseExpressionLanguage
{
    public function __construct(ParserCacheInterface $parser = null, array $providers = array())
    {
        // prepend the default provider to let users override it easily
        array_unshift($providers, new AppExpressionLanguageProvider());

        parent::__construct($parser, $providers);
    }
}

我使用相同的函数小写,即in the doc.但是现在,我没有ideia如何注册要在我的Symfony项目中加载的ExpressionLanguage类.

每次我尝试在注释中加载带有自定义函数的页面时,我都会收到此错误:

The function “lowercase” does not exist around position 26.

我正在使用Symfony 2.7.5.

最佳答案 标记security.expression_language_provider仅用于将语言提供程序添加到symfonys安全组件中使用的表达式语言,或者更具体地说,在ExpressionVoter中.

FrameworkBundle的@ Security-Annotation使用表达式语言的不同实例,该实例不了解您创建的语言提供程序.

为了能够在@ Security-Annotation中使用自定义语言提供程序,我使用以下编译器传递解决了这个问题:

<?php

namespace ApiBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\Reference;

/**
 * This compiler pass adds language providers tagged
 * with security.expression_language_provider to the
 * expression language used in the framework extra bundle.
 *
 * This allows to use custom expression language functions
 * in the @Security-Annotation.
 *
 * Symfony\Bundle\FrameworkBundle\DependencyInection\Compiler\AddExpressionLanguageProvidersPass
 * does the same, but only for the security.expression_language
 * which is used in the ExpressionVoter.
 */
class AddExpressionLanguageProvidersPass implements CompilerPassInterface
{
    /**
     * {@inheritdoc}
     */
    public function process(ContainerBuilder $container)
    {
        if ($container->has('sensio_framework_extra.security.expression_language')) {
            $definition = $container->findDefinition('sensio_framework_extra.security.expression_language');
            foreach ($container->findTaggedServiceIds('security.expression_language_provider') as $id => $attributes) {
                $definition->addMethodCall('registerProvider', array(new Reference($id)));
            }
        }
    }
}

这样,ExpressionVoter和FrameworkBundle使用的表达式语言都使用相同的语言提供程序进行配置.

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