YamlFileLoader loads YAML files service definitions.
Drupal does not use Symfony's Config component, so this is a partial copy of \Symfony\Component\DependencyInjection\Loader\YamlFileLoader class not depending on the Config component.
Expanded class hierarchy of YamlFileLoader
class YamlFileLoader {
/**
* @param \Drupal\Core\DependencyInjection\ContainerBuilder $container
*/
protected $container;
public function __construct(ContainerBuilder $container) {
$this->container = $container;
}
/**
* Load a YAML file containing service definitions and kernel parameters.
*
* string $filename
* The name of the file to load.
*/
public function load($filename) {
$content = $this
->loadFile($filename);
$content += array(
'parameters' => array(),
'services' => array(),
);
// parameters
foreach ($content['parameters'] as $key => $value) {
$this->container
->setParameter($key, $this
->resolveServices($value));
}
// services
foreach ($content['services'] as $id => $service) {
$this
->parseDefinition($id, $service, $filename);
}
}
/**
* Parses a definition.
*
* Copied from \Symfony\Component\DependencyInjection\Loader\YamlFileLoader::parseDefinition().
*
* @param string $id
* The id of the service.
* @param string|array $service
* Either a string starting with a @ meaning this service is an alias or
* the array defining the service.
* @param string $filename
* The name of the file, only used in error messages.
*
* @throws \InvalidArgumentException When tags are invalid
*/
protected function parseDefinition($id, $service, $filename) {
if (is_string($service) && 0 === strpos($service, '@')) {
$this->container
->setAlias($id, substr($service, 1));
return;
}
elseif (isset($service['alias'])) {
$public = !array_key_exists('public', $service) || (bool) $service['public'];
$this->container
->setAlias($id, new Alias($service['alias'], $public));
return;
}
if (isset($service['parent'])) {
$definition = new DefinitionDecorator($service['parent']);
}
else {
$definition = new Definition();
}
if (isset($service['class'])) {
$definition
->setClass($service['class']);
}
if (isset($service['scope'])) {
$definition
->setScope($service['scope']);
}
if (isset($service['synthetic'])) {
$definition
->setSynthetic($service['synthetic']);
}
if (isset($service['public'])) {
$definition
->setPublic($service['public']);
}
if (isset($service['abstract'])) {
$definition
->setAbstract($service['abstract']);
}
if (isset($service['factory_class'])) {
$definition
->setFactoryClass($service['factory_class']);
}
if (isset($service['factory_method'])) {
$definition
->setFactoryMethod($service['factory_method']);
}
if (isset($service['factory_service'])) {
$definition
->setFactoryService($service['factory_service']);
}
if (isset($service['file'])) {
$definition
->setFile($service['file']);
}
if (isset($service['arguments'])) {
$definition
->setArguments($this
->resolveServices($service['arguments']));
}
if (isset($service['properties'])) {
$definition
->setProperties($this
->resolveServices($service['properties']));
}
if (isset($service['configurator'])) {
if (is_string($service['configurator'])) {
$definition
->setConfigurator($service['configurator']);
}
else {
$definition
->setConfigurator(array(
$this
->resolveServices($service['configurator'][0]),
$service['configurator'][1],
));
}
}
if (isset($service['calls'])) {
foreach ($service['calls'] as $call) {
$args = isset($call[1]) ? $this
->resolveServices($call[1]) : array();
$definition
->addMethodCall($call[0], $args);
}
}
if (isset($service['tags'])) {
if (!is_array($service['tags'])) {
throw new \InvalidArgumentException(sprintf('Parameter "tags" must be an array for service "%s" in %s.', $id, $filename));
}
foreach ($service['tags'] as $tag) {
if (!isset($tag['name'])) {
throw new \InvalidArgumentException(sprintf('A "tags" entry is missing a "name" key for service "%s" in %s.', $id, $filename));
}
$name = $tag['name'];
unset($tag['name']);
foreach ($tag as $value) {
if (!is_scalar($value)) {
throw new \InvalidArgumentException(sprintf('A "tags" attribute must be of a scalar-type for service "%s", tag "%s" in %s.', $id, $name, $filename));
}
}
$definition
->addTag($name, $tag);
}
}
$this->container
->setDefinition($id, $definition);
}
/**
* Loads a YAML file.
*
* @param string $filename
*
* @return array
* The file content.
*/
protected function loadFile($filename) {
$parser = new Parser();
return $this
->validate($parser
->parse(file_get_contents($filename)), $filename);
}
/**
* Validates a YAML file.
*
* @param mixed $content
* The parsed YAML file.
* @param string $filename
* The name of the file, only used for error messages.
*
* @return array
* The $content unchanged returned to allow for chaining this method.
*
* @throws \InvalidArgumentException When service file is not valid
*/
protected function validate($content, $filename) {
if (NULL === $content) {
return $content;
}
if (!is_array($content)) {
throw new \InvalidArgumentException(sprintf('The service file "%s" is not valid: it is not an array.', $filename));
}
if ($keys = array_diff_key($content, array(
'parameters' => TRUE,
'services' => TRUE,
))) {
$invalid_keys = htmlspecialchars(implode(', ', $keys), ENT_QUOTES, 'UTF-8');
throw new \InvalidArgumentException(sprintf('The service file "%s" is not valid: it contains invalid keys %s.', $filename, $invalid_keys));
}
return $content;
}
/**
* Resolves services.
*
* Copied from \Symfony\Component\DependencyInjection\Loader\YamlFileLoader::parseDefinition().
*
* @param mixed $value
* If a string, then it is either a plain string (for example a class
* name) or a reference to a service. If it's an array then it's a list of
* such strings.
*
* @return string|\Symfony\Component\DependencyInjection\Reference
* Either the string unchanged or the Reference object.
*/
protected function resolveServices($value) {
if (is_array($value)) {
$value = array_map(array(
$this,
'resolveServices',
), $value);
}
elseif (is_string($value) && 0 === strpos($value, '@')) {
if (0 === strpos($value, '@?')) {
$value = substr($value, 2);
$invalidBehavior = ContainerInterface::IGNORE_ON_INVALID_REFERENCE;
}
else {
$value = substr($value, 1);
$invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE;
}
if ('=' === substr($value, -1)) {
$value = substr($value, 0, -1);
$strict = FALSE;
}
else {
$strict = TRUE;
}
$value = new Reference($value, $invalidBehavior, $strict);
}
return $value;
}
}
Name | Modifiers | Type | Description | Overrides |
---|---|---|---|---|
YamlFileLoader:: |
protected | property | ||
YamlFileLoader:: |
public | function | Load a YAML file containing service definitions and kernel parameters. | |
YamlFileLoader:: |
protected | function | Loads a YAML file. | |
YamlFileLoader:: |
protected | function | Parses a definition. | |
YamlFileLoader:: |
protected | function | Resolves services. | |
YamlFileLoader:: |
protected | function | Validates a YAML file. | |
YamlFileLoader:: |
public | function |