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45 lines
1.1 KiB
45 lines
1.1 KiB
<?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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* Acts as a sort of lazy reference for repository items in grammars.
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*/
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class RepositoryReference extends Reference {
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protected string $_name;
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protected PatternList|Pattern|null|false $object = null;
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public function __construct(string $name, Grammar $ownerGrammar) {
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$this->_name = $name;
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parent::__construct($ownerGrammar);
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}
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public function get(): PatternList|Pattern|null {
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if ($this->object === false) {
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return null;
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} elseif ($this->object !== null) {
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return $this->object;
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}
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$grammar = $this->_ownerGrammar->get();
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if (!isset($grammar->repository)) {
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die(var_export($grammar));
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}
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if (!isset($grammar->repository[$this->name])) {
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$this->object = false;
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return null;
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}
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$this->object = $grammar->repository[$this->name];
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return $this->object;
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}
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}
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