如何从 Symfony2 的服务中解析 yaml 文件 [英] How do I parse a yaml file from within a service in Symfony2

问题描述

我想从我的一个服务中的 yaml 文件中获取一个数组，但我对如何注入该文件以在我的 services.yml 中使用感到有些困惑.

I want to get an array from a yaml file inside one of my services, and I am a little confused of how to inject the file to use in my services.yml.

# /path/to/app/src/Bundle/Resources/config/services.yml
parameters:
    do_something: Bundle\DoSomething
    yaml.parser.class: Symfony\Component\Yaml\Parser
    yaml.config_file: "/Resources/config/config.yml" # what do I put here to win!

services:
    yaml_parser:
        class: %yaml.parser.class%

    do_parsing:
        class: %do_something%
        arguments: [ @yaml_parser, %yaml.config_file% ]

在我的服务中，我有

# /path/to/app/src/Bundle/DoSomething.php

<?php

namespace Bundle;

use \Symfony\Component\Yaml\Parser;

class DoSemething
{
    protected $parser;
    protected $parsed_yaml_file;

    public function __construct(Parser $parser, $file_path)
    {
       $this->parsed_yaml_file = $parser->parse(file_get_contents(__DIR__ . $file_path));
    }

    public function useParsedFile()
    {
        foreach($parsed_yaml_file as $k => $v)
        {
            // ...  etc etc 
        }
    }
}

这可能是完全错误的方法，如果我应该做其他事情，请告诉我！

This may be the completely wrong approach, if I should be doing something else please let me know!

推荐答案

首先，我将解释为什么我实施我的解决方案，让您决定这个案例是否适合您.

我需要一种方法来轻松地在我的包中加载自定义 .yml 文件(对于很多包)，因此为每个文件添加一个单独的行到 app/config.yml 似乎对每个设置都很麻烦.

I needed a way to easily load custom .yml files in my bundle (for lots of bundles) so adding a separate line to app/config.yml for every file seemed like a lot of hassle for every setup.

此外，我希望大多数配置已经默认加载，因此最终用户甚至不需要在大部分时间担心配置，尤其是不检查每个配置文件是否正确设置.

Also I wanted most of the configs to be already loaded by default so end-user wouldn't even need to worry about configuring most of the time, especially not checking that every config file is setup correctly.

如果这对您来说是类似的情况，请继续阅读.如果没有，就使用 Kris 解决方案，也是一个不错的选择！

If this seems like a similar case for you, read on. If not, just use Kris solution, is a good one too!

当我遇到这个功能的需求时，Symfony2并没有提供一个简单的方法来实现这一点，所以我是如何解决的:

Back when I encountered a need for this feature, Symfony2 didnt't provide a simple way to achieve this, so here how I solved it:

首先我创建了一个本地 YamlFileLoader 类，它基本上是一个简化的 Symfony2 类:

First I created a local YamlFileLoader class which was basically a dumbed down Symfony2 one:

<?php

namespace Acme\DemoBundle\Loader;

use Symfony\Component\Yaml\Yaml;
use Symfony\Component\Config\Loader\FileLoader;

/**
 * YamlFileLoader loads Yaml routing files.
 */
class YamlFileLoader extends FileLoader
{
    /**
     * Loads a Yaml file.
     *
     * @param string $file A Yaml file path
     *
     * @return array
     *
     * @throws \InvalidArgumentException When config can't be parsed
     */
    public function load($file, $type = null)
    {
        $path = $this->locator->locate($file);

        $config = Yaml::parse($path);

        // empty file
        if (null === $config) {
            $config = array();
        }

        // not an array
        if (!is_array($config)) {
            throw new \InvalidArgumentException(sprintf('The file "%s" must contain a YAML array.', $file));
        }

        return $config;
    }

    /**
     * Returns true if this class supports the given resource.
     *
     * @param mixed  $resource A resource
     * @param string $type     The resource type
     *
     * @return Boolean True if this class supports the given resource, false otherwise
     *
     * @api
     */
    public function supports($resource, $type = null)
    {
        return is_string($resource) && 'yml' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'yaml' === $type);
    }
}

然后我更新了我的包的 DIC 扩展(如果你让 Symfony2 创建完整的包架构，它通常会自动生成，如果不只是创建一个 DependencyInjection/Extension.php 文件包含以下内容的包目录:

Then I updated DIC Extension for my bundle (it's usually generated automatically if you let Symfony2 create full bundle architecture, if not just create a DependencyInjection/<Vendor&BundleName>Extension.php file in your bundle directory with following content:

<?php

namespace Acme\DemoBundle\DependencyInjection;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader;

use Acme\DemoBundle\Loader\YamlFileLoader;

/**
 * This is the class that loads and manages your bundle configuration
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html}
 */
class AcmeDemoExtension extends Extension
{
    /**
     * {@inheritDoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));

        $loader->load('services.xml');

        // until here everything is default config (for your DIC services)

        $ymlLoader = new YamlFileLoader(new FileLocator(__DIR__.'/../Resources/config'));
        $container->setParameter('param_name', $ymlLoader->load('yaml_file_name'))); // load yml file contents as an array
    }
}

现在您可以访问/传递您的 yaml 配置作为简单的服务参数(即 services.yml 的 %param_name%)

And now you can access/pass your yaml config as simple service parameter (i.e. %param_name% for services.yml)

这篇关于如何从 Symfony2 的服务中解析 yaml 文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！