You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
723 B
32 lines
723 B
<?php
|
|
/** @license MIT
|
|
* Copyright 2021 Dustin Wilson et al.
|
|
* See LICENSE file for details */
|
|
|
|
declare(strict_types=1);
|
|
namespace dW\Lit\Grammar;
|
|
use dW\Lit\Grammar;
|
|
|
|
/**
|
|
* A weak reference to a grammar's self. This indeed doesn't have to exist, but
|
|
* exists to maintain sanity when checking types.
|
|
*/
|
|
class SelfReference extends Reference {
|
|
protected ?Grammar $grammar;
|
|
|
|
|
|
public function __construct(Grammar $grammar, Grammar $ownerGrammar) {
|
|
$this->grammar = $grammar;
|
|
parent::__construct($ownerGrammar);
|
|
}
|
|
|
|
public function __destruct() {
|
|
parent::__destruct();
|
|
$this->grammar = null;
|
|
}
|
|
|
|
|
|
public function get(): Grammar {
|
|
return $this->grammar;
|
|
}
|
|
}
|