<?php

namespace Cocur\Slugify;

use Cocur\Slugify\RuleProvider\DefaultRuleProvider;
use Cocur\Slugify\RuleProvider\RuleProviderInterface;

/**
 * Slugify
 *
 * @package   Cocur\Slugify
 * @author    Florian Eckerstorfer <florian@eckerstorfer.co>
 * @author    Ivo Bathke <ivo.bathke@gmail.com>
 * @author    Marchenko Alexandr
 * @copyright 2012-2015 Florian Eckerstorfer
 * @license   http://www.opensource.org/licenses/MIT The MIT License
 */
class Slugify implements SlugifyInterface
{
	public const LOWERCASE_NUMBERS_DASHES = '/[^A-Za-z0-9]+/';

	/** @var array<string,string> */
	protected array $rules = [];

	/** @var RuleProviderInterface */
	protected RuleProviderInterface $provider;

	/** @var array<string,mixed> */
	protected array $options = [
	    'regexp'    => self::LOWERCASE_NUMBERS_DASHES,
	    'separator' => '-',
	    'lowercase' => true,
	    'lowercase_after_regexp' => false,
	    'trim' => true,
	    'strip_tags' => false,
	    'rulesets'  => [
	        'default',
	        // Languages are preferred if they appear later, list is ordered by number of
	        // websites in that language
	        // https://en.wikipedia.org/wiki/Languages_used_on_the_Internet#Content_languages_for_websites
	        'yiddish',
	        'armenian',
	        'azerbaijani',
	        'burmese',
	        'hindi',
	        'georgian',
	        'norwegian',
	        'vietnamese',
	        'ukrainian',
	        'latvian',
	        'finnish',
	        'greek',
	        'czech',
	        'arabic',
	        'slovak',
	        'turkish',
	        'polish',
	        'german',
	        'russian',
	        'romanian'
	    ],
	];


	/**
	 * @param array                 $options
	 * @param RuleProviderInterface $provider
	 */
	public function __construct(array $options = [], ?RuleProviderInterface $provider = null)
	{
		$this->options  = array_merge($this->options, $options);
		$this->provider = $provider ? $provider : new DefaultRuleProvider();

		foreach ($this->options['rulesets'] as $ruleSet) {
		    $this->activateRuleSet($ruleSet);
		}
	}


	/**
	 * Returns the slug-version of the string.
	 *
	 * @param string            $string  String to slugify
	 * @param string|array|null $options Options
	 *
	 * @return string Slugified version of the string
	 */
	public function slugify(string $string, array|string|null $options = null): string
	{
		if (is_string($options)) {
		    $separator            = $options;
		    $options              = [];
		    $options['separator'] = $separator;
		}

		$options = array_merge($this->options, (array) $options);

		// Add a custom ruleset without touching the default rules
		if (isset($options['ruleset'])) {
		    $rules = array_merge($this->rules, $this->provider->getRules($options['ruleset']));
		} else {
		    $rules = $this->rules;
		}

		$string = ($options['strip_tags'])
		    ? strip_tags($string)
		    : $string;

		$string = strtr($string, $rules);
		unset($rules);

		if ($options['lowercase'] && !$options['lowercase_after_regexp']) {
		    $string = mb_strtolower($string);
		}

		$string = preg_replace($options['regexp'], $options['separator'], $string);

		if ($options['lowercase'] && $options['lowercase_after_regexp']) {
		    $string = mb_strtolower($string);
		}

		return ($options['trim'])
		    ? trim($string, $options['separator'])
		    : $string;
	}


	/**
	 * Adds a custom rule to Slugify.
	 *
	 * @param string $character   Character
	 * @param string $replacement Replacement character
	 *
	 * @return Slugify
	 */
	public function addRule($character, $replacement): self
	{
		$this->rules[$character] = $replacement;

		return $this;
	}


	/**
	 * Adds multiple rules to Slugify.
	 *
	 * @param array <string,string> $rules
	 *
	 * @return Slugify
	 */
	public function addRules(array $rules): self
	{
		foreach ($rules as $character => $replacement) {
		    $this->addRule($character, $replacement);
		}

		return $this;
	}


	/**
	 * @param string $ruleSet
	 *
	 * @return Slugify
	 */
	public function activateRuleSet($ruleSet): self
	{
		return $this->addRules($this->provider->getRules($ruleSet));
	}


	/**
	 * Static method to create new instance of {@see Slugify}.
	 *
	 * @param array <string,mixed> $options
	 *
	 * @return Slugify
	 */
	public static function create(array $options = []): self
	{
		return new static($options);
	}
}
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