EntityDataHelper.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\entity;
 
use pocketmine\data\SavedDataLoadingException;
use pocketmine\math\Vector3;
use pocketmine\nbt\NBT;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\DoubleTag;
use pocketmine\nbt\tag\FloatTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\world\World;
use function count;
use function is_infinite;
use function is_nan;
 
final class EntityDataHelper{
 
    private function __construct(){
        //NOOP
    }
 
    private static function validateFloat(string $tagName, string $component, float $value) : void{
        if(is_infinite($value)){
            throw new SavedDataLoadingException("$component component of '$tagName' contains invalid infinite value");
        }
        if(is_nan($value)){
            throw new SavedDataLoadingException("$component component of '$tagName' contains invalid NaN value");
        }
    }
 
    public static function parseLocation(CompoundTag $nbt, World $world) : Location{
        $pos = self::parseVec3($nbt, Entity::TAG_POS, false);
 
        $yawPitch = $nbt->getTag(Entity::TAG_ROTATION);
        if(!($yawPitch instanceof ListTag) || $yawPitch->getTagType() !== NBT::TAG_Float){
            throw new SavedDataLoadingException("'" . Entity::TAG_ROTATION . "' should be a List<Float>");
        }
        $values = $yawPitch->getValue();
        if(count($values) !== 2){
            throw new SavedDataLoadingException("Expected exactly 2 entries for 'Rotation'");
        }
        self::validateFloat(Entity::TAG_ROTATION, "yaw", $values[0]->getValue());
        self::validateFloat(Entity::TAG_ROTATION, "pitch", $values[1]->getValue());
 
        return Location::fromObject($pos, $world, $values[0]->getValue(), $values[1]->getValue());
    }
 
    public static function parseVec3(CompoundTag $nbt, string $tagName, bool $optional) : Vector3{
        $pos = $nbt->getTag($tagName);
        if($pos === null && $optional){
            return Vector3::zero();
        }
        if(!($pos instanceof ListTag) || ($pos->getTagType() !== NBT::TAG_Double && $pos->getTagType() !== NBT::TAG_Float)){
            throw new SavedDataLoadingException("'$tagName' should be a List<Double> or List<Float>");
        }
        $values = $pos->getValue();
        if(count($values) !== 3){
            throw new SavedDataLoadingException("Expected exactly 3 entries in '$tagName' tag");
        }
 
        $x = $values[0]->getValue();
        $y = $values[1]->getValue();
        $z = $values[2]->getValue();
 
        self::validateFloat($tagName, "x", $x);
        self::validateFloat($tagName, "y", $y);
        self::validateFloat($tagName, "z", $z);
 
        return new Vector3($x, $y, $z);
    }
}