Crafting: nuke

This commit brings in a much-needed rewrite of crafting transaction handling.

The following classes have been removed:
- CraftingTransferMaterialAction
- CraftingTakeResultAction

The following classes have significant changes:
- CraftingTransaction
	- All API methods have been removed and are now handled in CraftItemEvent
- CraftItemEvent
	- added the following:
		- getInputs()
		- getOutputs()
		- getRepetitions() (tells how many times a recipe was crafted in this event)
- Recipe interface:
	- Removed getResult() (individual recipes may handle this differently)
- CraftingRecipe interface
	- removed the following:
		- matchItems()
		- getExtraResults()
		- getAllResults()
	- added the following
		- getResults()
		- getIngredientList() : Item[], which must return a 1D array of items that should be consumed (wildcards accepted).
		- matchesCraftingGrid(CraftingGrid)
- ShapedRecipe
	- constructor now accepts string[], Item[], Item[]
- ShapelessRecipe
	- constructor now accepts Item[], Item[]

src/pocketmine/inventory/CraftingGrid.php

@@ -23,6 +23,8 @@ declare(strict_types=1);
 
 namespace pocketmine\inventory;
 
+use pocketmine\item\Item;
+use pocketmine\item\ItemFactory;
 use pocketmine\Player;
 
 class CraftingGrid extends BaseInventory{
@@ -34,6 +36,15 @@ class CraftingGrid extends BaseInventory{
 	/** @var int */
 	private $gridWidth;
 
+	/** @var int|null */
+	private $startX;
+	/** @var int|null */
+	private $xLen;
+	/** @var int|null */
+	private $startY;
+	/** @var int|null */
+	private $yLen;
+
 	public function __construct(Player $holder, int $gridWidth){
 		$this->holder = $holder;
 		$this->gridWidth = $gridWidth;
@@ -56,6 +67,16 @@ class CraftingGrid extends BaseInventory{
 		return "Crafting";
 	}
 
+	public function setItem(int $index, Item $item, bool $send = true) : bool{
+		if(parent::setItem($index, $item, $send)){
+			$this->seekRecipeBounds();
+
+			return true;
+		}
+
+		return false;
+	}
+
 	public function sendSlot(int $index, $target) : void{
 		//we can't send a slot of a client-sided inventory window
 	}
@@ -70,4 +91,70 @@ class CraftingGrid extends BaseInventory{
 	public function getHolder(){
 		return $this->holder;
 	}
+
+	private function seekRecipeBounds() : void{
+		$minX = PHP_INT_MAX;
+		$maxX = 0;
+
+		$minY = PHP_INT_MAX;
+		$maxY = 0;
+
+		$empty = true;
+
+		for($y = 0; $y < $this->gridWidth; ++$y){
+			for($x = 0; $x < $this->gridWidth; ++$x){
+				if(!$this->isSlotEmpty($y * $this->gridWidth + $x)){
+					$minX = min($minX, $x);
+					$maxX = max($maxX, $x);
+
+					$minY = min($minY, $y);
+					$maxY = max($maxY, $y);
+
+					$empty = false;
+				}
+			}
+		}
+
+		if(!$empty){
+			$this->startX = $minX;
+			$this->xLen = $maxX - $minX + 1;
+			$this->startY = $minY;
+			$this->yLen = $maxY - $minY + 1;
+		}else{
+			$this->startX = $this->xLen = $this->startY = $this->yLen = null;
+		}
+	}
+
+	/**
+	 * Returns the item at offset x,y, offset by where the starts of the recipe rectangle are.
+	 *
+	 * @param int $x
+	 * @param int $y
+	 *
+	 * @return Item
+	 */
+	public function getIngredient(int $x, int $y) : Item{
+		if($this->startX !== null and $this->startY !== null){
+			return $this->getItem(($y + $this->startY) * $this->gridWidth + ($x + $this->startX));
+		}
+
+		throw new \InvalidStateException("No ingredients found in grid");
+	}
+
+	/**
+	 * Returns the width of the recipe we're trying to craft, based on items currently in the grid.
+	 *
+	 * @return int
+	 */
+	public function getRecipeWidth() : int{
+		return $this->xLen ?? 0;
+	}
+
+	/**
+	 * Returns the height of the recipe we're trying to craft, based on items currently in the grid.
+	 * @return int
+	 */
+	public function getRecipeHeight() : int{
+		return $this->yLen ?? 0;
+	}
 }