Added script to generate biome IDs

this has been sitting in my local workspace for a very long time

build/generate-biome-ids.php

@@ -0,0 +1,133 @@
+<?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\build\generate_biome_ids;
+
+use pocketmine\data\bedrock\BedrockDataFiles;
+use pocketmine\utils\Filesystem;
+use pocketmine\utils\Utils;
+use function asort;
+use function dirname;
+use function fclose;
+use function fopen;
+use function fwrite;
+use function is_array;
+use function is_int;
+use function is_string;
+use function json_decode;
+use function str_replace;
+use function strtoupper;
+use const SORT_NUMERIC;
+
+require dirname(__DIR__) . '/vendor/autoload.php';
+
+const HEADER = <<<'HEADER'
+<?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);
+
+
+HEADER;
+
+/** @return resource */
+function safe_fopen(string $file, string $flags){
+	$result = fopen($file, $flags);
+	if($result === false){
+		throw new \RuntimeException("Failed to open file");
+	}
+	return $result;
+}
+
+function make_const_name(string $name) : string{
+	return strtoupper(str_replace(['.', 'minecraft:'], ['_', ''], $name));
+}
+
+/**
+ * @param int[] $map
+ * @phpstan-param array<string, int> $map
+ */
+function generate(array $map, string $outputFile) : void{
+	$file = safe_fopen($outputFile, 'wb');
+	fwrite($file, HEADER);
+	fwrite($file, <<<'CLASSHEADER'
+namespace pocketmine\data\bedrock;
+
+final class BiomeIds{
+
+	private function __construct(){
+		//NOOP
+	}
+
+
+CLASSHEADER
+);
+	$list = $map;
+	asort($list, SORT_NUMERIC);
+	$lastId = -1;
+	foreach(Utils::stringifyKeys($list) as $name => $id){
+		if($name === ""){
+			continue;
+		}
+		if($id !== $lastId + 1){
+			fwrite($file, "\n");
+		}
+		$lastId = $id;
+		fwrite($file, "\tpublic const " . make_const_name($name) . ' = ' . $id . ';' . "\n");
+	}
+	fwrite($file, "}\n");
+	fclose($file);
+}
+
+$ids = json_decode(Filesystem::fileGetContents(BedrockDataFiles::BIOME_ID_MAP_JSON), true);
+if(!is_array($ids)){
+	throw new \RuntimeException("Invalid biome ID map, expected array for root JSON object");
+}
+$cleanedIds = [];
+foreach($ids as $name => $id){
+	if(!is_string($name) || !is_int($id)){
+		throw new \RuntimeException("Invalid biome ID map, expected string => int map");
+	}
+	$cleanedIds[$name] = $id;
+}
+generate($cleanedIds, dirname(__DIR__) . '/src/data/bedrock/BiomeIds.php');
+
+echo "Done. Don't forget to run CS fixup after generating code.\n";