PaperMC/patches/unapplied/server/1061-Improve-exact-choice-recipe-ingredients.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 25 Jun 2023 23:10:14 -0700
Subject: [PATCH] Improve exact choice recipe ingredients

Fixes exact choices not working with recipe book clicks
and shapeless recipes.

Feature patch

== AT ==
public net.minecraft.world.item.ItemStackLinkedSet TYPE_AND_TAG

diff --git a/src/main/java/io/papermc/paper/inventory/recipe/ItemOrExact.java b/src/main/java/io/papermc/paper/inventory/recipe/ItemOrExact.java
new file mode 100644
index 0000000000000000000000000000000000000000..caaad8f54fb892dfd6c7d4e02ab9c32997f89a6a
--- /dev/null
+++ b/src/main/java/io/papermc/paper/inventory/recipe/ItemOrExact.java
@@ -0,0 +1,63 @@
+package io.papermc.paper.inventory.recipe;
+
+import net.minecraft.core.Holder;
+import net.minecraft.world.item.ItemStack;
+
+public sealed interface ItemOrExact permits ItemOrExact.Item, ItemOrExact.Exact {
+
+    int getMaxStackSize();
+
+    boolean matches(ItemStack stack);
+
+    record Item(Holder<net.minecraft.world.item.Item> item) implements ItemOrExact {
+
+        public Item(final ItemStack stack) {
+            this(stack.getItemHolder());
+        }
+
+        @Override
+        public int getMaxStackSize() {
+            return this.item.value().getDefaultMaxStackSize();
+        }
+
+        @Override
+        public boolean matches(final ItemStack stack) {
+            return stack.is(this.item) && stack.getComponentsPatch().isEmpty();
+        }
+
+        @Override
+        public boolean equals(final Object obj) {
+            if (!(obj instanceof final Item otherItem)) return false;
+            return this.item.equals(otherItem.item());
+        }
+
+        @Override
+        public int hashCode() {
+            return this.item.hashCode();
+        }
+    }
+
+    record Exact(ItemStack stack) implements ItemOrExact {
+
+        @Override
+        public int getMaxStackSize() {
+            return this.stack.getMaxStackSize();
+        }
+
+        @Override
+        public boolean matches(final ItemStack stack) {
+            return ItemStack.isSameItemSameComponents(this.stack, stack);
+        }
+
+        @Override
+        public boolean equals(final Object obj) {
+            if (!(obj instanceof final Exact otherExact)) return false;
+            return ItemStack.isSameItemSameComponents(this.stack, otherExact.stack);
+        }
+
+        @Override
+        public int hashCode() {
+            return ItemStack.hashItemAndComponents(this.stack);
+        }
+    }
+}
diff --git a/src/main/java/io/papermc/paper/inventory/recipe/StackedContentsExtrasMap.java b/src/main/java/io/papermc/paper/inventory/recipe/StackedContentsExtrasMap.java
new file mode 100644
index 0000000000000000000000000000000000000000..bdb876a0e687d4b9e885118523e91185a164b27c
--- /dev/null
+++ b/src/main/java/io/papermc/paper/inventory/recipe/StackedContentsExtrasMap.java
@@ -0,0 +1,67 @@
+package io.papermc.paper.inventory.recipe;
+
+import it.unimi.dsi.fastutil.objects.Object2IntMap;
+import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import it.unimi.dsi.fastutil.objects.ObjectOpenCustomHashSet;
+import it.unimi.dsi.fastutil.objects.ObjectSet;
+import net.minecraft.world.entity.player.StackedContents;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.ItemStackLinkedSet;
+import net.minecraft.world.item.crafting.CraftingInput;
+import net.minecraft.world.item.crafting.Recipe;
+
+public final class StackedContentsExtrasMap {
+
+    private final StackedContents<ItemOrExact> contents;
+    public Object2IntMap<ItemOrExact.Item> regularRemoved = new Object2IntOpenHashMap<>(); // needed for re-using the regular contents (for ShapelessRecipe)
+    public final ObjectSet<ItemStack> exactIngredients = new ObjectOpenCustomHashSet<>(ItemStackLinkedSet.TYPE_AND_TAG);
+
+    public StackedContentsExtrasMap(final StackedContents<ItemOrExact> contents) {
+        this.contents = contents;
+    }
+
+    public void initialize(final Recipe<?> recipe) {
+        this.exactIngredients.clear();
+        for (final StackedContents.IngredientInfo<ItemOrExact> info : recipe.placementInfo().unpackedIngredients()) {
+            if (info.isExact()) {
+                this.exactIngredients.addAll(info.allowedItems().stream().map(o -> ((ItemOrExact.Exact) o).stack()).toList());
+            }
+        }
+    }
+
+    public void accountInput(final CraftingInput input) {
+        // similar logic to the CraftingInput constructor
+        for (final ItemStack item : input.items()) {
+            if (!item.isEmpty()) {
+                if (this.accountStack(item, 1)) {
+                    // if stack was accounted for as an exact ingredient, don't include it in the regular contents
+                    final ItemOrExact.Item asItem = new ItemOrExact.Item(item);
+                    if (this.contents.amounts.containsKey(asItem)) {
+                        final int amount = this.contents.amounts.removeInt(asItem);
+                        this.regularRemoved.put(asItem, amount);
+                    }
+                }
+            }
+        }
+    }
+
+    public void resetExtras() {
+        // clear previous extra ids
+        for (final ItemStack extra : this.exactIngredients) {
+            this.contents.amounts.removeInt(new ItemOrExact.Exact(extra));
+        }
+        for (final Object2IntMap.Entry<ItemOrExact.Item> entry : this.regularRemoved.object2IntEntrySet()) {
+            this.contents.amounts.addTo(entry.getKey(), entry.getIntValue());
+        }
+        this.exactIngredients.clear();
+        this.regularRemoved.clear();
+    }
+
+    public boolean accountStack(final ItemStack stack, final int count) {
+        if (this.exactIngredients.contains(stack)) {
+            this.contents.account(new ItemOrExact.Exact(stack), count);
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java b/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java
index 462a970ffa610bc1eb3c813dafb768c014d077d1..1afb544fb028b645821063ba1eaa9e3c45cee63f 100644
--- a/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java
+++ b/src/main/java/net/minecraft/recipebook/ServerPlaceRecipe.java
@@ -41,6 +41,7 @@ public class ServerPlaceRecipe<R extends Recipe<?>> {
             return RecipeBookMenu.PostPlaceAction.NOTHING;
         } else {
             StackedItemContents stackedItemContents = new StackedItemContents();
+            stackedItemContents.initializeExtras(recipe.value(), null); // Paper - Improve exact choice recipe ingredients
             inventory.fillStackedContents(stackedItemContents);
             handler.fillCraftSlotsStackedContents(stackedItemContents);
             return serverPlaceRecipe.tryPlaceRecipe(recipe, stackedItemContents);
@@ -100,9 +101,9 @@ public class ServerPlaceRecipe<R extends Recipe<?>> {
         }
 
         int j = this.calculateAmountToCraft(i, bl);
-        List<Holder<Item>> list = new ArrayList<>();
+        List<io.papermc.paper.inventory.recipe.ItemOrExact> list = new ArrayList<>(); // Paper - Improve exact choice recipe ingredients
         if (finder.canCraft(recipe.value(), j, list::add)) {
-            OptionalInt optionalInt = list.stream().mapToInt(item -> item.value().getDefaultMaxStackSize()).min();
+            OptionalInt optionalInt = list.stream().mapToInt(io.papermc.paper.inventory.recipe.ItemOrExact::getMaxStackSize).min(); // Paper - Improve exact choice recipe ingredients
             if (optionalInt.isPresent()) {
                 j = Math.min(j, optionalInt.getAsInt());
             }
@@ -119,7 +120,7 @@ public class ServerPlaceRecipe<R extends Recipe<?>> {
                             int kx = k;
 
                             while (kx > 0) {
-                                Holder<Item> holder = list.get(jx);
+                                io.papermc.paper.inventory.recipe.ItemOrExact holder = list.get(jx); // Paper - Improve exact choice recipe ingredients
                                 kx = this.moveItemToGrid(slot2, holder, kx);
                                 if (kx == -1) {
                                     return;
@@ -155,7 +156,7 @@ public class ServerPlaceRecipe<R extends Recipe<?>> {
         }
     }
 
-    private int moveItemToGrid(Slot slot, Holder<Item> item, int count) {
+    private int moveItemToGrid(Slot slot, io.papermc.paper.inventory.recipe.ItemOrExact item, int count) { // Paper - Improve exact choice recipe ingredients
         int i = this.inventory.findSlotMatchingCraftingIngredient(item);
         if (i == -1) {
             return -1;
diff --git a/src/main/java/net/minecraft/world/entity/player/Inventory.java b/src/main/java/net/minecraft/world/entity/player/Inventory.java
index ad82e5aeb565b23c3ec565fa60e1f31d1710bd4e..0990bcf65f484b9a019c91fcdae1783bac6388da 100644
--- a/src/main/java/net/minecraft/world/entity/player/Inventory.java
+++ b/src/main/java/net/minecraft/world/entity/player/Inventory.java
@@ -201,11 +201,11 @@ public class Inventory implements Container, Nameable {
         return !stack.isDamaged() && !stack.isEnchanted() && !stack.has(DataComponents.CUSTOM_NAME);
     }
 
-    public int findSlotMatchingCraftingIngredient(Holder<Item> item) {
+    public int findSlotMatchingCraftingIngredient(io.papermc.paper.inventory.recipe.ItemOrExact item) { // Paper - Improve exact choice recipe ingredients
         for (int i = 0; i < this.items.size(); ++i) {
             ItemStack itemstack = (ItemStack) this.items.get(i);
 
-            if (!itemstack.isEmpty() && itemstack.is(item) && Inventory.isUsableForCrafting(itemstack)) {
+            if (!itemstack.isEmpty() && item.matches(itemstack) && (!(item instanceof io.papermc.paper.inventory.recipe.ItemOrExact.Item) || isUsableForCrafting(itemstack))) { // Paper - Improve exact choice recipe ingredients
                 return i;
             }
         }
diff --git a/src/main/java/net/minecraft/world/entity/player/StackedContents.java b/src/main/java/net/minecraft/world/entity/player/StackedContents.java
index 3bc7c9b3df5547c6564696fce67417c96ffdebf9..9ad3c4510f0e0530dfbbc3ba7e6d19b7678e1294 100644
--- a/src/main/java/net/minecraft/world/entity/player/StackedContents.java
+++ b/src/main/java/net/minecraft/world/entity/player/StackedContents.java
@@ -10,7 +10,7 @@ import java.util.Set;
 import javax.annotation.Nullable;
 
 public class StackedContents<T> {
-    public final Reference2IntOpenHashMap<T> amounts = new Reference2IntOpenHashMap<>();
+    public final it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap<T> amounts = new it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap<>(); // Paper - Improve exact choice recipe ingredients (don't use "reference" map)
 
     boolean hasAnyAmount(T input) {
         return this.amounts.getInt(input) > 0;
@@ -47,12 +47,13 @@ public class StackedContents<T> {
         this.put(input, count);
     }
 
-    public static record IngredientInfo<T>(List<T> allowedItems) {
-        public IngredientInfo(List<T> allowedItems) {
+    public static record IngredientInfo<T>(List<T> allowedItems, boolean isExact) { // Paper - Improve exact choice recipe ingredients
+        public IngredientInfo(List<T> allowedItems, boolean isExact) { // Paper - Improve exact choice recipe ingredients
             if (allowedItems.isEmpty()) {
                 throw new IllegalArgumentException("Ingredients can't be empty");
             } else {
                 this.allowedItems = allowedItems;
+                this.isExact = isExact; // Paper - Improve exact choice recipe ingredients
             }
         }
     }
diff --git a/src/main/java/net/minecraft/world/entity/player/StackedItemContents.java b/src/main/java/net/minecraft/world/entity/player/StackedItemContents.java
index cc6c5cf0d1034ed074b6c354c307a0c2613f85c7..3f075c5c12f7ce331200fddb1b6602380d6f5f3e 100644
--- a/src/main/java/net/minecraft/world/entity/player/StackedItemContents.java
+++ b/src/main/java/net/minecraft/world/entity/player/StackedItemContents.java
@@ -12,9 +12,14 @@ import net.minecraft.world.item.crafting.PlacementInfo;
 import net.minecraft.world.item.crafting.Recipe;
 
 public class StackedItemContents {
-    private final StackedContents<Holder<Item>> raw = new StackedContents<>();
+    // Paper start - Improve exact choice recipe ingredients
+    private final StackedContents<io.papermc.paper.inventory.recipe.ItemOrExact> raw = new StackedContents<>();
+    @Nullable
+    private io.papermc.paper.inventory.recipe.StackedContentsExtrasMap extrasMap = null;
+    // Paper start - Improve exact choice recipe ingredients
 
     public void accountSimpleStack(ItemStack item) {
+        if (this.extrasMap != null && this.extrasMap.accountStack(item, Math.min(64, item.getCount()))) return; // Paper - Improve exact choice recipe ingredients; max of 64 due to accountStack method below
         if (Inventory.isUsableForCrafting(item)) {
             this.accountStack(item);
         }
@@ -27,39 +32,56 @@ public class StackedItemContents {
     public void accountStack(ItemStack item, int maxCount) {
         if (!item.isEmpty()) {
             int i = Math.min(maxCount, item.getCount());
-            this.raw.account(item.getItemHolder(), i);
+            if (this.extrasMap != null && !item.getComponentsPatch().isEmpty() && this.extrasMap.accountStack(item, i)) return; // Paper - Improve exact choice recipe ingredients; if an exact ingredient, don't include it
+            this.raw.account(new io.papermc.paper.inventory.recipe.ItemOrExact.Item(item.getItemHolder()), i);
         }
     }
 
-    public static StackedContents.IngredientInfo<Holder<Item>> convertIngredientContents(Stream<Holder<Item>> items) {
-        List<Holder<Item>> list = items.sorted(Comparator.comparingInt(item -> BuiltInRegistries.ITEM.getId(item.value()))).toList();
-        return new StackedContents.IngredientInfo<>(list);
+    // Paper start - Improve exact choice recipe ingredients
+    public void initializeExtras(final Recipe<?> recipe, @Nullable final net.minecraft.world.item.crafting.CraftingInput input) {
+        if (this.extrasMap == null) {
+            this.extrasMap = new io.papermc.paper.inventory.recipe.StackedContentsExtrasMap(this.raw);
+        }
+        this.extrasMap.initialize(recipe);
+        if (input != null) this.extrasMap.accountInput(input);
+    }
+
+    public void resetExtras() {
+        if (this.extrasMap != null && !this.raw.amounts.isEmpty()) {
+            this.extrasMap.resetExtras();
+        }
+    }
+
+    public static StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact> convertIngredientContents(Stream<io.papermc.paper.inventory.recipe.ItemOrExact> items, boolean isExact) {
+        List<io.papermc.paper.inventory.recipe.ItemOrExact> list = items.sorted(Comparator.comparingInt(item -> isExact ? ItemStack.hashItemAndComponents(((io.papermc.paper.inventory.recipe.ItemOrExact.Exact) item).stack()) : BuiltInRegistries.ITEM.getId(((io.papermc.paper.inventory.recipe.ItemOrExact.Item) item).item().value()))).toList();
+        return new StackedContents.IngredientInfo<>(list, isExact);
+        // Paper end - Improve exact choice recipe ingredients
     }
 
-    public boolean canCraft(Recipe<?> recipe, @Nullable StackedContents.Output<Holder<Item>> itemCallback) {
+    public boolean canCraft(Recipe<?> recipe, @Nullable StackedContents.Output<io.papermc.paper.inventory.recipe.ItemOrExact> itemCallback) { // Paper - Improve exact choice recipe ingredients
         return this.canCraft(recipe, 1, itemCallback);
     }
 
-    public boolean canCraft(Recipe<?> recipe, int quantity, @Nullable StackedContents.Output<Holder<Item>> itemCallback) {
+    public boolean canCraft(Recipe<?> recipe, int quantity, @Nullable StackedContents.Output<io.papermc.paper.inventory.recipe.ItemOrExact> itemCallback) { // Paper - Improve exact choice recipe ingredients
         PlacementInfo placementInfo = recipe.placementInfo();
         return !placementInfo.isImpossibleToPlace() && this.canCraft(placementInfo.unpackedIngredients(), quantity, itemCallback);
     }
 
-    public boolean canCraft(List<StackedContents.IngredientInfo<Holder<Item>>> rawIngredients, @Nullable StackedContents.Output<Holder<Item>> itemCallback) {
+    public boolean canCraft(List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> rawIngredients, @Nullable StackedContents.Output<io.papermc.paper.inventory.recipe.ItemOrExact> itemCallback) { // Paper - Improve exact choice recipe ingredients
         return this.canCraft(rawIngredients, 1, itemCallback);
     }
 
     private boolean canCraft(
-        List<StackedContents.IngredientInfo<Holder<Item>>> rawIngredients, int quantity, @Nullable StackedContents.Output<Holder<Item>> itemCallback
+        List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> rawIngredients, int quantity, @Nullable StackedContents.Output<io.papermc.paper.inventory.recipe.ItemOrExact> itemCallback // Paper - Improve exact choice recipe ingredients
     ) {
         return this.raw.tryPick(rawIngredients, quantity, itemCallback);
     }
 
-    public int getBiggestCraftableStack(Recipe<?> recipe, @Nullable StackedContents.Output<Holder<Item>> itemCallback) {
+    public int getBiggestCraftableStack(Recipe<?> recipe, @Nullable StackedContents.Output<io.papermc.paper.inventory.recipe.ItemOrExact> itemCallback) { // Paper - Improve exact choice recipe ingredients
         return this.getBiggestCraftableStack(recipe, Integer.MAX_VALUE, itemCallback);
     }
 
-    public int getBiggestCraftableStack(Recipe<?> recipe, int max, @Nullable StackedContents.Output<Holder<Item>> itemCallback) {
+    public int getBiggestCraftableStack(Recipe<?> recipe, int max, @Nullable StackedContents.Output<io.papermc.paper.inventory.recipe.ItemOrExact> itemCallback) { // Paper - Improve exact choice recipe ingredients
         return this.raw.tryPickAll(recipe.placementInfo().unpackedIngredients(), max, itemCallback);
     }
 
diff --git a/src/main/java/net/minecraft/world/item/crafting/Ingredient.java b/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
index 2dce801e06687c218be3333ac9f000bae09f0caf..812f919a7a7e309c8513f44104f092496037608f 100644
--- a/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
+++ b/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
@@ -139,6 +139,11 @@ public final class Ingredient implements Predicate<ItemStack> {
     }
 
     public SlotDisplay display() {
+        // Paper start - show exact ingredients in recipe book
+        if (this.isExact()) {
+            return new SlotDisplay.Composite(this.itemStacks().stream().<SlotDisplay>map(SlotDisplay.ItemStackSlotDisplay::new).toList());
+        }
+        // Paper end - show exact ingredients in recipe book
         return (SlotDisplay) this.values.unwrap().map(SlotDisplay.TagSlotDisplay::new, (list) -> {
             return new SlotDisplay.Composite(list.stream().map(Ingredient::displayForSingleItem).toList());
         });
diff --git a/src/main/java/net/minecraft/world/item/crafting/PlacementInfo.java b/src/main/java/net/minecraft/world/item/crafting/PlacementInfo.java
index 43124a000f48e243d75df64051fbda816035af25..400fd1cdfd17d4d34552f9bb3d91bc71fd394301 100644
--- a/src/main/java/net/minecraft/world/item/crafting/PlacementInfo.java
+++ b/src/main/java/net/minecraft/world/item/crafting/PlacementInfo.java
@@ -11,26 +11,28 @@ import net.minecraft.world.item.Item;
 public class PlacementInfo {
     public static final PlacementInfo NOT_PLACEABLE = new PlacementInfo(List.of(), List.of(), List.of());
     private final List<Ingredient> ingredients;
-    private final List<StackedContents.IngredientInfo<Holder<Item>>> unpackedIngredients;
+    private final List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> unpackedIngredients; // Paper - Improve exact choice recipe ingredients
     private final List<Optional<PlacementInfo.SlotInfo>> slotInfo;
 
     private PlacementInfo(
-        List<Ingredient> ingredients, List<StackedContents.IngredientInfo<Holder<Item>>> rawIngredients, List<Optional<PlacementInfo.SlotInfo>> placementSlots
+        List<Ingredient> ingredients, List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> rawIngredients, List<Optional<PlacementInfo.SlotInfo>> placementSlots // Paper - Improve exact choice recipe ingredients
     ) {
         this.ingredients = ingredients;
         this.unpackedIngredients = rawIngredients;
         this.slotInfo = placementSlots;
     }
 
-    public static StackedContents.IngredientInfo<Holder<Item>> ingredientToContents(Ingredient ingredient) {
-        return StackedItemContents.convertIngredientContents(ingredient.items().stream());
+    // Paper start - Improve exact choice recipe ingredients
+    public static StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact> ingredientToContents(Ingredient ingredient) {
+        return StackedItemContents.convertIngredientContents(ingredient.isExact() ? ingredient.itemStacks().stream().map(io.papermc.paper.inventory.recipe.ItemOrExact.Exact::new) : ingredient.items().stream().map(io.papermc.paper.inventory.recipe.ItemOrExact.Item::new), ingredient.isExact());
+        // Paper end - Improve exact choice recipe ingredients
     }
 
     public static PlacementInfo create(Ingredient ingredient) {
         if (ingredient.items().isEmpty()) {
             return NOT_PLACEABLE;
         } else {
-            StackedContents.IngredientInfo<Holder<Item>> ingredientInfo = ingredientToContents(ingredient);
+            StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact> ingredientInfo = ingredientToContents(ingredient); // Paper - Improve exact choice recipe ingredients
             PlacementInfo.SlotInfo slotInfo = new PlacementInfo.SlotInfo(0);
             return new PlacementInfo(List.of(ingredient), List.of(ingredientInfo), List.of(Optional.of(slotInfo)));
         }
@@ -39,7 +41,7 @@ public class PlacementInfo {
     public static PlacementInfo createFromOptionals(List<Optional<Ingredient>> ingredients) {
         int i = ingredients.size();
         List<Ingredient> list = new ArrayList<>(i);
-        List<StackedContents.IngredientInfo<Holder<Item>>> list2 = new ArrayList<>(i);
+        List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> list2 = new ArrayList<>(i); // Paper - Improve exact choice recipe ingredients
         List<Optional<PlacementInfo.SlotInfo>> list3 = new ArrayList<>(i);
         int j = 0;
 
@@ -63,7 +65,7 @@ public class PlacementInfo {
 
     public static PlacementInfo create(List<Ingredient> ingredients) {
         int i = ingredients.size();
-        List<StackedContents.IngredientInfo<Holder<Item>>> list = new ArrayList<>(i);
+        List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> list = new ArrayList<>(i); // Paper - Improve exact choice recipe ingredients
         List<Optional<PlacementInfo.SlotInfo>> list2 = new ArrayList<>(i);
 
         for (int j = 0; j < i; j++) {
@@ -87,7 +89,7 @@ public class PlacementInfo {
         return this.ingredients;
     }
 
-    public List<StackedContents.IngredientInfo<Holder<Item>>> unpackedIngredients() {
+    public List<StackedContents.IngredientInfo<io.papermc.paper.inventory.recipe.ItemOrExact>> unpackedIngredients() { // Paper - Improve exact choice recipe ingredients
         return this.unpackedIngredients;
     }
 
diff --git a/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java b/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java
index 6ec7b234b468755835107be40d0080222c0b9263..12f95bee2a69fd5df7c4a165537e01299e60c5f6 100644
--- a/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java
+++ b/src/main/java/net/minecraft/world/item/crafting/ShapelessRecipe.java
@@ -80,7 +80,18 @@ public class ShapelessRecipe implements CraftingRecipe {
     }
 
     public boolean matches(CraftingInput input, Level world) {
-        return input.ingredientCount() != this.ingredients.size() ? false : (input.size() == 1 && this.ingredients.size() == 1 ? ((Ingredient) this.ingredients.getFirst()).test(input.getItem(0)) : input.stackedContents().canCraft((Recipe) this, (StackedContents.Output) null));
+        // Paper start - Improve exact choice recipe ingredients & unwrap ternary
+        if (input.ingredientCount() != this.ingredients.size()) {
+            return false;
+        }
+        if (input.size() == 1 && this.ingredients.size() == 1) {
+            return this.ingredients.getFirst().test(input.getItem(0));
+        }
+        input.stackedContents().initializeExtras(this, input);
+        boolean canCraft = input.stackedContents().canCraft(this, null);
+        input.stackedContents().resetExtras();
+        return canCraft;
+        // Paper end - Improve exact choice recipe ingredients & unwrap ternary
     }
 
     public ItemStack assemble(CraftingInput input, HolderLookup.Provider registries) {