<?php namespace BookStack\References\ModelResolvers; use BookStack\App\Model; use BookStack\Entities\Models\Chapter; use BookStack\Entities\Queries\ChapterQueries; class ChapterLinkModelResolver implements CrossLinkModelResolver { public function __construct( protected ChapterQueries $queries ) { } public function resolve(string $link): ?Model { $pattern = '/^' . preg_quote(url('/books'), '/') . '\/([\w-]+)' . '\/chapter\/' . '([\w-]+)' . '([#?\/]|$)/'; $matches = []; $match = preg_match($pattern, $link, $matches); if (!$match) { return null; } $bookSlug = $matches[1]; $chapterSlug = $matches[2]; /** @var ?Chapter $model */ $model = $this->queries->usingSlugs($bookSlug, $chapterSlug)->first(['id']); return $model; } }