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30 lines
735 B
30 lines
735 B
<?php
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/** @license MIT
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* Copyright 2021 Dustin Wilson et al.
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* See LICENSE file for details */
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declare(strict_types=1);
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namespace dW\Lit\Grammar;
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use dW\Lit\Grammar;
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/**
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* Abstract class used as a base class for Pattern and Reference classes
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*/
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abstract class Rule {
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use FauxReadOnly;
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protected \WeakReference $_ownerGrammar;
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public function __construct(Grammar $ownerGrammar) {
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$this->_ownerGrammar = \WeakReference::create($ownerGrammar);
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}
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// Used when adopting to change the $ownerGrammar property.
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public function withOwnerGrammar(Grammar $ownerGrammar): self {
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$new = clone $this;
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$new->_ownerGrammar = \WeakReference::create($ownerGrammar);
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return $new;
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}
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}
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