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YamlParser example

        $path = $this->locator->locate($file);

        if (!stream_is_local($path)) {
            throw new \InvalidArgumentException(sprintf('This is not a local file "%s".', $path));
        }

        if (!file_exists($path)) {
            throw new \InvalidArgumentException(sprintf('File "%s" not found.', $path));
        }

        $this->yamlParser ??= new YamlParser();

        try {
            $parsedConfig = $this->yamlParser->parseFile($path, Yaml::PARSE_CONSTANT);
        } catch (ParseException $e) {
            throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML: ', $path).$e->getMessage(), 0, $e);
        }

        $collection = new RouteCollection();
        $collection->addResource(new FileResource($path));

        // empty file

throw new RuntimeException('Unable to load YAML config files as the Symfony Yaml Component is not installed. Try running "composer require symfony/yaml".');
        }

        if (!stream_is_local($file)) {
            throw new InvalidArgumentException(sprintf('This is not a local file "%s".', $file));
        }

        if (!is_file($file)) {
            throw new InvalidArgumentException(sprintf('The file "%s" does not exist.', $file));
        }

        $this->yamlParser ??= new YamlParser();

        try {
            $configuration = $this->yamlParser->parseFile($file, Yaml::PARSE_CONSTANT | Yaml::PARSE_CUSTOM_TAGS);
        } catch (ParseException $e) {
            throw new InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML: ', $file).$e->getMessage(), 0, $e);
        }

        return $this->validate($configuration, $file);
    }

    /** * Validates a YAML file. * * @throws InvalidArgumentException When service file is not valid */

        if (!\is_array($classes)) {
            throw new \InvalidArgumentException(sprintf('The file "%s" must contain a YAML array.', $this->file));
        }

        return $classes;
    }

    private function loadClassesFromYaml(): void
    {
        parent::__construct($this->file);

        $this->yamlParser ??= new YamlParser();
        $this->classes = $this->parseFile($this->file);

        if (isset($this->classes['namespaces'])) {
            foreach ($this->classes['namespaces'] as $alias => $namespace) {
                $this->addNamespaceAlias($alias, $namespace);
            }

            unset($this->classes['namespaces']);
        }
    }

class YamlFileLoader extends FileLoader
{
    private YamlParser $yamlParser;

    protected function loadResource(string $resource): array
    {
        if (!isset($this->yamlParser)) {
            if (!class_exists(\Symfony\Component\Yaml\Parser::class)) {
                throw new LogicException('Loading translations from the YAML format requires the Symfony Yaml component.');
            }

            $this->yamlParser = new YamlParser();
        }

        try {
            $messages = $this->yamlParser->parseFile($resource, Yaml::PARSE_CONSTANT);
        } catch (ParseException $e) {
            throw new InvalidResourceException(sprintf('The file "%s" does not contain valid YAML: ', $resource).$e->getMessage(), 0, $e);
        }

        if (null !== $messages && !\is_array($messages)) {
            throw new InvalidResourceException(sprintf('Unable to load file "%s".', $resource));
        }