protected function BackendBase::getCallbackFunction in SCSS Compiler 1.0.x

Fetch the callback function to use for the supplied descriptor.

This method serves to provide a point where the concrete class can wrap (or otherwise modify) the callback function before it is conveyed to the underlying compiler implementation.

By default, this method wraps the callback function to facilitate processing of its return value.

Parameters

object $descriptor: A function descriptor object created by ::registerFunction().

Return value

callable The callback function to use for the supplied descriptor.

File

src/BackendBase.php, line 84

Class

BackendBase

Provides a base compiler backend implementation.

Namespace

Drupal\compiler_scss

Code

protected function getCallbackFunction(object $descriptor) {
  return function ($args) use ($descriptor) {
    if (count($args) !== count($descriptor->params)) {
      throw new \BadFunctionCallException('PHP function parameter mismatch');
    }
    $args = array_map([
      $this,
      'processArgumentValue',
    ], $args);
    $return = call_user_func_array($descriptor->callback, $args);
    $return = $this
      ->processReturnValue($return);
    return $return;
  };
}