FlatGeneratorOptions.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\world\generator;
 
use pocketmine\data\bedrock\BiomeIds;
use pocketmine\item\LegacyStringToItemParser;
use pocketmine\item\LegacyStringToItemParserException;
use pocketmine\world\World;
use function array_map;
use function explode;
use function preg_match;
use function preg_match_all;
use const PHP_INT_MAX;
 
final class FlatGeneratorOptions{
 
    public function __construct(
        private array $structure,
        private int $biomeId,
        private array $extraOptions = []
    ){}
 
    public function getStructure() : array{ return $this->structure; }
 
    public function getBiomeId() : int{ return $this->biomeId; }
 
    public function getExtraOptions() : array{ return $this->extraOptions; }
 
    public static function parseLayers(string $layers) : array{
        $result = [];
        $split = array_map('\trim', explode(',', $layers, limit: World::Y_MAX - World::Y_MIN));
        $y = 0;
        $itemParser = LegacyStringToItemParser::getInstance();
        foreach($split as $line){
            if(preg_match('#^(?:(\d+)[x|*])?(.+)$#', $line, $matches) !== 1){
                throw new InvalidGeneratorOptionsException("Invalid preset layer \"$line\"");
            }
 
            $cnt = $matches[1] !== "" ? (int) $matches[1] : 1;
            try{
                $b = $itemParser->parse($matches[2])->getBlock();
            }catch(LegacyStringToItemParserException $e){
                throw new InvalidGeneratorOptionsException("Invalid preset layer \"$line\": " . $e->getMessage(), 0, $e);
            }
            for($cY = $y, $y += $cnt; $cY < $y; ++$cY){
                $result[$cY] = $b->getStateId();
            }
        }
 
        return $result;
    }
 
    public static function parsePreset(string $presetString) : self{
        $preset = explode(";", $presetString, limit: 4);
        $blocks = $preset[1] ?? "";
        $biomeId = (int) ($preset[2] ?? BiomeIds::PLAINS);
        $optionsString = $preset[3] ?? "";
        $structure = self::parseLayers($blocks);
 
        $options = [];
        //TODO: more error checking
        preg_match_all('#(([0-9a-z_]{1,})\‍(?([0-9a-z_ =:]{0,})\‍)?),?#', $optionsString, $matches);
        foreach($matches[2] as $i => $option){
            $params = true;
            if($matches[3][$i] !== ""){
                $params = [];
                $p = explode(" ", $matches[3][$i], limit: PHP_INT_MAX);
                foreach($p as $k){
                    //TODO: this should be limited to 2 parts, but 3 preserves old behaviour when given e.g. treecount=20=1
                    $k = explode("=", $k, limit: 3);
                    if(isset($k[1])){
                        $params[$k[0]] = $k[1];
                    }
                }
            }
            $options[$option] = $params;
        }
        return new self($structure, $biomeId, $options);
    }
 
}