/**
* @param ConfigInterface $config
*
* @return DirectiveInterface
* @throws Exception
*/
public function mergeInto(ConfigInterface $config) : DirectiveInterface
{
$identifier = sprintf('%s.%s', static::class, $this->identifier);
// only set directive if it is not present
if ($config->lacks($identifier)) {
$config->set($identifier, $this->getValue());
return $this;
}
$mergePolicy = $this->mergePolicy;
// automatically define the merge policy depending
// on current directive value
//
// - MERGE arrays
// - REPLACE other types
if ($mergePolicy == MergePolicy::AUTO) {
if (is_array($config->get($identifier))) {
$mergePolicy = MergePolicy::NATIVE;
} else {
$mergePolicy = MergePolicy::REPLACE;
}
}
// otherwise handle MergePolicy
switch ($mergePolicy) {
case MergePolicy::SKIP:
break;
case MergePolicy::REPLACE:
$config->set($identifier, $this->getValue());
break;
case MergePolicy::NATIVE:
$combinedValue = array_merge((array) $config->get($identifier), (array) $this->value);
$config->set($identifier, $combinedValue);
break;
case MergePolicy::COMBINE:
case MergePolicy::RECURSIVE:
$combinedValue = array_merge_recursive((array) $config->get($identifier), (array) $this->value);
$config->set($identifier, $combinedValue);
break;
default:
throw new Exception(sprintf('Unsupported merge policy "%s"', $this->mergePolicy));
}
return $this;
}