Tag.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
*/
 
declare(strict_types=1);
 
namespace pocketmine\nbt\tag;
 
use pocketmine\nbt\NbtStreamWriter;
 
abstract class Tag{
 
    protected $cloning = false;
 
    abstract public function getValue();
 
    abstract public function getType() : int;
 
    abstract public function write(NbtStreamWriter $writer) : void;
 
    public function __toString(){
        return $this->toString();
    }
 
    final public function toString(int $indentation = 0) : string{
        return "TAG_" . $this->getTypeName() . "=" . $this->stringifyValue($indentation);
    }
 
    abstract protected function getTypeName() : string;
 
    abstract protected function stringifyValue(int $indentation) : string;
 
    public function safeClone() : Tag{
        if($this->cloning){
            throw new \RuntimeException("Recursive NBT tag dependency detected");
        }
        $this->cloning = true;
 
        $retval = $this->makeCopy();
 
        $this->cloning = false;
        $retval->cloning = false;
 
        return $retval;
    }
 
    abstract protected function makeCopy();
 
    public function equals(Tag $that) : bool{
        return $that instanceof $this and $this->getValue() === $that->getValue();
    }
 
    protected static function restrictArgCount(string $func, int $haveArgs, int $wantMaxArgs) : void{
        if($haveArgs > $wantMaxArgs){
            throw new \ArgumentCountError("$func() expects at most $wantMaxArgs parameters, $haveArgs given");
        }
    }
}