WritableBookBase.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\item;
 
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\nbt\tag\StringTag;
use function array_push;
use function array_slice;
use function array_values;
use function count;
use function mb_scrub;
 
abstract class WritableBookBase extends Item{
    public const TAG_PAGES = "pages"; //TAG_List<TAG_Compound>
    public const TAG_PAGE_TEXT = "text"; //TAG_String
    public const TAG_PAGE_PHOTONAME = "photoname"; //TAG_String - TODO
 
    private array $pages = [];
 
    public function __construct(ItemIdentifier $identifier, string $name){
        parent::__construct($identifier, $name);
    }
 
    public function pageExists(int $pageId) : bool{
        return isset($this->pages[$pageId]);
    }
 
    public function getPageText(int $pageId) : string{
        return $this->pages[$pageId]->getText();
    }
 
    public function setPageText(int $pageId, string $pageText) : self{
        if(!$this->pageExists($pageId)){
            $this->addPage($pageId);
        }
 
        $this->pages[$pageId] = new WritableBookPage($pageText);
        return $this;
    }
 
    public function addPage(int $pageId) : self{
        if($pageId < 0){
            throw new \InvalidArgumentException("Page number \"$pageId\" is out of range");
        }
 
        for($current = count($this->pages); $current <= $pageId; $current++){
            $this->pages[] = new WritableBookPage("");
        }
        return $this;
    }
 
    public function deletePage(int $pageId) : self{
        $newPages = $this->pages;
        unset($newPages[$pageId]);
        $this->pages = array_values($newPages);
        return $this;
    }
 
    public function insertPage(int $pageId, string $pageText = "") : self{
        if($pageId < 0 || $pageId > count($this->pages)){
            throw new \InvalidArgumentException("Page ID must not be negative");
        }
        $newPages = array_slice($this->pages, 0, $pageId);
        $newPages[] = new WritableBookPage($pageText);
        array_push($newPages, ...array_slice($this->pages, $pageId));
        $this->pages = $newPages;
        return $this;
    }
 
    public function swapPages(int $pageId1, int $pageId2) : bool{
        $pageContents1 = $this->getPageText($pageId1);
        $pageContents2 = $this->getPageText($pageId2);
        $this->setPageText($pageId1, $pageContents2);
        $this->setPageText($pageId2, $pageContents1);
 
        return true;
    }
 
    public function getMaxStackSize() : int{
        return 1;
    }
 
    public function getPages() : array{
        return $this->pages;
    }
 
    public function setPages(array $pages) : self{
        $this->pages = array_values($pages);
        return $this;
    }
 
    protected function deserializeCompoundTag(CompoundTag $tag) : void{
        parent::deserializeCompoundTag($tag);
        $this->pages = [];
 
        $pages = $tag->getListTag(self::TAG_PAGES);
        if($pages !== null){
            if(($compoundPages = $pages->cast(CompoundTag::class)) !== null){ //PE format
                foreach($compoundPages as $page){
                    $this->pages[] = new WritableBookPage(mb_scrub($page->getString(self::TAG_PAGE_TEXT), 'UTF-8'), $page->getString(self::TAG_PAGE_PHOTONAME, ""));
                }
            }elseif(($stringPages = $pages->cast(StringTag::class)) !== null){ //PC format
                foreach($stringPages as $page){
                    $this->pages[] = new WritableBookPage(mb_scrub($page->getValue(), 'UTF-8'));
                }
            }
        }
    }
 
    protected function serializeCompoundTag(CompoundTag $tag) : void{
        parent::serializeCompoundTag($tag);
        if(count($this->pages) > 0){
            $pages = new ListTag();
            foreach($this->pages as $page){
                $pages->push(CompoundTag::create()
                    ->setString(self::TAG_PAGE_TEXT, $page->getText())
                    ->setString(self::TAG_PAGE_PHOTONAME, $page->getPhotoName())
                );
            }
            $tag->setTag(self::TAG_PAGES, $pages);
        }else{
            $tag->removeTag(self::TAG_PAGES);
        }
    }
}