Deliver consumed item remainders through player inventory pickup

benchmarks/rust-extra-items-2026-10-07/scoped-parity.json

@@ -0,0 +1,287 @@
+{
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+    "crates/horizon-world/src/worldgen.rs": "e8e9f099ee1fcec8eedce31805d676d3f89c18e84f494a147ffcbfee23d3d54f",
+    "crates/horizon-world/examples/extra_items_fixture.rs": "84c269be3c83bc93e72f9c3c9da01474e80d20a8f383ebf426111630701d6fd7"
+  },
+  "fixtures_sha256": {
+    ".local/rust-extra-items-parity/inputs.txt": "29dc3f0f6006102f75008b1c73b62d5dffd8c07e40608580619438f215d3fa72"
+  },
+  "rust_output_sha256": "16470d61d827eda49a1d589908582e8431ed026f89faa4b57eeac9766c211c13",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "16470d61d827eda49a1d589908582e8431ed026f89faa4b57eeac9766c211c13",
+      "matched_output_lines": 272124
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "16470d61d827eda49a1d589908582e8431ed026f89faa4b57eeac9766c211c13",
+      "matched_output_lines": 272124
+    }
+  ],
+  "scope": "Actual ItemStack.finishUsingItem with validated remainders and cooldowns now invokes inherited ServerPlayer.handleExtraItemsCreatedOnUse and real Inventory/PlayerEquipment insertion. Shared item/component references, occupied/aliased slots, offhand merging, creative material queries, partial insertion and the drop fallback are compared through mutation/failure prefixes. The drop call verifies throwRandomly=false and predicted semantics; its entity-spawn body is controlled. Rust composes item-after-use and inventory pickup. Item handlers, full contained schemas, dropped-entity creation, complete use lifecycle and full gameplay remain pending."
+}

crates/horizon-world/examples/extra_items_fixture.rs

@@ -0,0 +1,446 @@
+use horizon_world::{
+    component_patch::{Patch, Prototype},
+    identifier::Identifier,
+    item_after_use::{self, AfterUseWorld},
+    item_cooldowns::{self, CooldownUser, ItemCooldowns, Observer, UseCooldown},
+    item_stack_refs::{ItemStacks, StackRef},
+    item_stack_storage::ItemStackData,
+    item_template::{ItemTemplate, ValidationRules},
+};
+use horizon_world::{
+    extra_items::{self, ExtraItemHooks},
+    inventory_pickup::{PickupError, PickupHooks},
+    player_inventory::{EntityEquipment, InventoryRules, PlayerInventory},
+};
+use serde_json::Value;
+use std::{
+    fs,
+    io::{self, Write},
+    path::Path,
+};
+#[derive(Clone, Debug, PartialEq)]
+enum Component {
+    Integer(i32),
+    Remainder(ItemTemplate<usize, u8, Component>),
+    Cooldown(UseCooldown<Identifier>),
+}
+type Stack = StackRef<usize, u8, Component>;
+type StackData = ItemStackData<usize, u8, Component>;
+type Template = ItemTemplate<usize, u8, Component>;
+type Book = ItemCooldowns<Identifier>;
+type Inventory = PlayerInventory<usize, u8, Component>;
+fn n(v: &Value, k: &str) -> i32 {
+    v[k].as_i64().unwrap() as i32
+}
+fn integer(v: Option<&Component>) -> Option<i32> {
+    match v {
+        Some(Component::Integer(n)) => Some(*n),
+        _ => None,
+    }
+}
+fn bits(f: f32) -> u32 {
+    if f.is_nan() { 0x7fc00000 } else { f.to_bits() }
+}
+fn cooldown(v: &Value) -> Option<UseCooldown<Identifier>> {
+    v["cooldown"].as_u64().map(|b| UseCooldown {
+        seconds: f32::from_bits(b as u32),
+        group: usize::try_from(n(v, "group"))
+            .ok()
+            .map(|i| Identifier::parse(&format!("test:group{i}")).unwrap()),
+    })
+}
+fn template(v: &Value) -> Option<Template> {
+    v["remainder"].as_i64().map(|count| {
+        let mut p = Vec::new();
+        if let Some(m) = v["maximum"].as_i64() {
+            p.push((0, Some(Component::Integer(m as i32))));
+        }
+        if v["damage"].as_bool().unwrap() {
+            p.push((1, Some(Component::Integer(0))));
+        }
+        Template::new(2, 0, count as i32, Patch::new(p)).unwrap()
+    })
+}
+fn components(stack: &Stack, v: &Value) {
+    let mut s = stack.write();
+    s.components
+        .set(2, template(v).map(Component::Remainder))
+        .unwrap();
+    s.components
+        .set(3, cooldown(v).map(Component::Cooldown))
+        .unwrap();
+}
+struct Data {
+    f: Value,
+    out: io::BufWriter<fs::File>,
+    refs: [Stack; 3],
+    extra: Option<Stack>,
+    original: Option<Stack>,
+    result: Option<Stack>,
+    dropped: Option<Stack>,
+    changed: bool,
+    calls: i32,
+    prototypes: [Prototype<u8, Component>; 3],
+    store: ItemStacks<usize, u8, Component>,
+}
+impl Data {
+    fn config(&self) -> &Value {
+        &self.f[if self.changed { "after" } else { "initial" }]
+    }
+    fn snapshot(&self, s: Option<&Stack>) -> String {
+        let Some(s) = s else {
+            return "none".into();
+        };
+        let d = s.read();
+        let remainder = match d.component(&2) {
+            Some(Component::Remainder(t)) => format!(
+                "{}:{}",
+                t.count(),
+                integer(t.component(&self.prototypes[t.item()], &0)).unwrap_or(1)
+            ),
+            _ => "none".into(),
+        };
+        let cooldown = match d.component(&3) {
+            Some(Component::Cooldown(c)) => format!(
+                "{}:{}",
+                bits(c.seconds),
+                c.group.as_ref().map_or("none".into(), ToString::to_string)
+            ),
+            _ => "none".into(),
+        };
+        format!(
+            "{} {} {} {} {} {} {}",
+            s.same_reference(&self.store.empty()),
+            d.item(),
+            d.count,
+            d.count(),
+            d.pop_time,
+            remainder,
+            cooldown
+        )
+    }
+    fn all(&mut self, book: &Book, inventory: &Inventory) {
+        writeln!(
+            self.out,
+            "state {} {} {}",
+            self.calls, self.changed, book.tick_count
+        )
+        .unwrap();
+        let slots = [
+            Some(self.refs[0].clone()),
+            Some(self.refs[1].clone()),
+            Some(self.refs[2].clone()),
+            self.extra.clone(),
+            self.original.clone(),
+            self.result.clone(),
+            self.dropped.clone(),
+        ];
+        for (i, s) in slots.iter().enumerate() {
+            writeln!(self.out, "ref {i} {}", self.snapshot(s.as_ref())).unwrap();
+        }
+        let mut same = Vec::new();
+        for a in 0..slots.len() {
+            for b in a + 1..slots.len() {
+                same.push((slots[a] == slots[b]).to_string());
+            }
+        }
+        writeln!(self.out, "same {}", same.join(",")).unwrap();
+        let entries = book
+            .entries()
+            .map(|(k, v)| format!("{k}={}:{}", v.start, v.end))
+            .collect::<Vec<_>>()
+            .join(",");
+        writeln!(self.out, "cooldowns {entries}").unwrap();
+        let mut contents = Vec::new();
+        for i in 0..43 {
+            let item = inventory.get(i).unwrap();
+            if !item.same_reference(&self.store.empty()) {
+                let aliases = slots
+                    .iter()
+                    .map(|v| {
+                        v.as_ref()
+                            .is_some_and(|r| r.same_reference(&item))
+                            .to_string()
+                    })
+                    .collect::<Vec<_>>()
+                    .join(",");
+                contents.push(format!("{i}={} [{aliases}]", self.snapshot(Some(&item))));
+            }
+        }
+        writeln!(
+            self.out,
+            "inventory {} | {}",
+            inventory.selected(),
+            contents.join(" | ")
+        )
+        .unwrap();
+    }
+    fn reset(&mut self, book: &mut Book, inventory: &mut Inventory) {
+        let c = self.config().clone();
+        self.prototypes[2] = Prototype::new([(0, Component::Integer(n(&c, "prototype_max")))]);
+        for i in 0..2 {
+            let v = &c["items"][i];
+            self.refs[i].write().count = n(v, "count");
+            components(&self.refs[i], v);
+        }
+        book.tick_count = n(&c, "clock");
+        inventory.clear();
+        inventory.set_selected(n(&c, "selected")).unwrap();
+        for pair in c["slots"].as_array().unwrap() {
+            inventory
+                .set(
+                    pair[0].as_i64().unwrap() as i32,
+                    self.refs[pair[1].as_u64().unwrap() as usize].clone(),
+                )
+                .unwrap();
+        }
+        if let Some(extra) = &self.extra {
+            extra.write().count = n(&c, "extra_count");
+        }
+        if let Some(original) = &self.original {
+            original.write().count = n(&c, "original_count");
+            components(original, &c["items"][1]);
+        }
+    }
+    fn event(
+        &mut self,
+        book: &mut Book,
+        inventory: &mut Inventory,
+        name: String,
+    ) -> Result<(), &'static str> {
+        writeln!(self.out, "event {name}").unwrap();
+        let index = self.calls;
+        self.calls += 1;
+        self.all(book, inventory);
+        if index == n(&self.f, "fail") {
+            return Err("callback");
+        }
+        if index == n(&self.f, "mutate") {
+            self.changed = true;
+            self.reset(book, inventory);
+        }
+        Ok(())
+    }
+}
+struct Observe<'a> {
+    data: &'a mut Data,
+    inventory: &'a mut Inventory,
+}
+impl Observer<Identifier> for Observe<'_> {
+    type Error = &'static str;
+    fn started(&mut self, b: &mut Book, g: Identifier, d: i32) -> Result<(), Self::Error> {
+        self.data
+            .event(b, self.inventory, format!("started {g} {d}"))
+    }
+    fn ended(&mut self, _: &mut Book, _: Identifier) -> Result<(), Self::Error> {
+        unreachable!()
+    }
+}
+struct Pickup<'a> {
+    data: &'a mut Data,
+    book: &'a mut Book,
+}
+impl InventoryRules<usize, u8, Component> for Pickup<'_> {
+    fn is_enchanted(&self, _: &Stack) -> bool {
+        false
+    }
+    fn is_damaged(&self, _: &Stack) -> bool {
+        false
+    }
+    fn has_custom_name(&self, _: &Stack) -> bool {
+        false
+    }
+}
+impl PickupHooks<usize, u8, Component> for Pickup<'_> {
+    type Error = &'static str;
+    fn item_max_stack_size(&self, s: &Stack) -> i32 {
+        integer(s.read().component(&0)).unwrap_or(1)
+    }
+    fn max_stack_size(&mut self, _: &mut Inventory) -> Result<i32, Self::Error> {
+        Ok(99)
+    }
+    fn infinite_materials(&mut self, inv: &mut Inventory) -> Result<bool, Self::Error> {
+        self.data.event(self.book, inv, "infinite".into())?;
+        Ok(self.data.config()["infinite"].as_bool().unwrap())
+    }
+}
+impl ExtraItemHooks<usize, u8, Component> for Pickup<'_> {
+    fn drop_predicted(&mut self, inv: &mut Inventory, s: Stack) -> Result<(), Self::Error> {
+        self.data.dropped = Some(s);
+        self.data.event(self.book, inv, "drop".into())
+    }
+}
+struct World {
+    data: Data,
+    book: Book,
+    inventory: Inventory,
+}
+impl ValidationRules<usize, u8, Component> for World {
+    type ContentsError = std::convert::Infallible;
+    fn has_max_damage(&self, s: &StackData) -> bool {
+        s.component(&1).is_some()
+    }
+    fn max_stack_size(&self, s: &StackData) -> i32 {
+        integer(s.component(&0)).unwrap_or(1)
+    }
+    fn validate_contents(&self, _: &StackData) -> Result<(), Self::ContentsError> {
+        Ok(())
+    }
+}
+impl CooldownUser for World {
+    type Error = &'static str;
+    type Stack = Stack;
+    type Manager = ();
+    fn is_player(&self) -> bool {
+        self.data.f["player"].as_bool().unwrap()
+    }
+    fn cooldowns(&mut self) -> Result<(), Self::Error> {
+        self.data
+            .event(&mut self.book, &mut self.inventory, "get-cooldowns".into())
+    }
+    fn add_cooldown(&mut self, _: (), stack: Stack, ticks: i32) -> Result<(), Self::Error> {
+        self.data.original = Some(stack.clone());
+        self.data.event(
+            &mut self.book,
+            &mut self.inventory,
+            format!("add-cooldown {ticks}"),
+        )?;
+        let group = {
+            let s = stack.read();
+            let c = match s.component(&3) {
+                Some(Component::Cooldown(c)) => Some(c),
+                _ => None,
+            };
+            item_cooldowns::group(c, || {
+                Identifier::parse(if s.item() == 2 {
+                    "minecraft:stick"
+                } else {
+                    "minecraft:air"
+                })
+                .unwrap()
+            })
+        };
+        self.book.add(
+            group,
+            ticks,
+            &mut Observe {
+                data: &mut self.data,
+                inventory: &mut self.inventory,
+            },
+        )
+    }
+}
+impl AfterUseWorld<usize, u8, Component> for World {
+    type Error = &'static str;
+    type Level = ();
+    type Group = Identifier;
+    fn remainder(&self, s: &StackData) -> Option<Template> {
+        match s.component(&2) {
+            Some(Component::Remainder(t)) => Some(t.clone()),
+            _ => None,
+        }
+    }
+    fn cooldown(&self, s: &StackData) -> Option<UseCooldown<Identifier>> {
+        match s.component(&3) {
+            Some(Component::Cooldown(c)) => Some(c.clone()),
+            _ => None,
+        }
+    }
+    fn prototype(&self, item: usize) -> Prototype<u8, Component> {
+        self.data.prototypes[item].clone()
+    }
+    fn finish_item(&mut self, s: Stack, _: ()) -> Result<Stack, Self::Error> {
+        let kind = s.read().item();
+        if kind == 1 {
+            self.data
+                .event(&mut self.book, &mut self.inventory, "finish".into())?;
+            Ok(self.data.refs[n(self.data.config(), "finish") as usize].clone())
+        } else {
+            Ok(s)
+        }
+    }
+    fn infinite_materials(&mut self) -> Result<bool, Self::Error> {
+        self.data
+            .event(&mut self.book, &mut self.inventory, "infinite".into())?;
+        Ok(self.data.config()["infinite"].as_bool().unwrap())
+    }
+    fn extra_item(&mut self, s: Stack) -> Result<(), Self::Error> {
+        self.data.extra = Some(s.clone());
+        self.data
+            .event(&mut self.book, &mut self.inventory, "extra".into())?;
+        if self.data.f["player"].as_bool().unwrap() {
+            extra_items::deliver(
+                &mut self.inventory,
+                s,
+                &mut Pickup {
+                    data: &mut self.data,
+                    book: &mut self.book,
+                },
+            )
+            .map_err(|e| match e {
+                PickupError::Callback(e) => e,
+                PickupError::Inventory(_) => "callback",
+            })?;
+        }
+        Ok(())
+    }
+    fn apply_cooldown(
+        &mut self,
+        c: UseCooldown<Identifier>,
+        original: Stack,
+    ) -> Result<(), Self::Error> {
+        c.apply(self, original)
+    }
+}
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let arg = std::env::args().nth(1).unwrap();
+    let dir = Path::new(&arg);
+    let mut out = io::BufWriter::new(fs::File::create(dir.join("rust.txt"))?);
+    for line in fs::read_to_string(dir.join("inputs.txt"))?.lines() {
+        let f: Value = serde_json::from_str(line)?;
+        let store = ItemStacks::new(0);
+        let prototypes = [
+            Prototype::new([]),
+            Prototype::new([]),
+            Prototype::new([(0, Component::Integer(n(&f["initial"], "prototype_max")))]),
+        ];
+        let refs = [
+            store.create(1, 1, prototypes[1].clone()),
+            store.create(2, 1, prototypes[2].clone()),
+            store.empty(),
+        ];
+        refs[0].write().pop_time = 5;
+        refs[1].write().pop_time = 7;
+        let mut w = World {
+            data: Data {
+                f,
+                out,
+                refs,
+                extra: None,
+                original: None,
+                result: None,
+                dropped: None,
+                changed: false,
+                calls: 0,
+                prototypes,
+                store: store.clone(),
+            },
+            book: Book::default(),
+            inventory: Inventory::new(store.clone(), EntityEquipment::new(store.empty())),
+        };
+        w.data.reset(&mut w.book, &mut w.inventory);
+        w.data.all(&w.book, &w.inventory);
+        let source = w.data.refs[n(&w.data.f, "source") as usize].clone();
+        let result = item_after_use::finish(&store, &mut w, source, ());
+        match result {
+            Ok(s) => {
+                w.data.result = Some(s);
+                writeln!(w.data.out, "result ok")?;
+            }
+            Err(e) => writeln!(w.data.out, "result {e}")?,
+        }
+        w.data.all(&w.book, &w.inventory);
+        out = w.data.out;
+    }
+    Ok(())
+}

crates/horizon-world/src/extra_items.rs

@@ -0,0 +1,26 @@
+//! Server-player delivery of extra items created by consuming an item.
+use crate::{
+    inventory_pickup::{self, PickupError, PickupHooks},
+    item_stack_refs::StackRef,
+    player_inventory::PlayerInventory,
+};
+pub trait ExtraItemHooks<I, K, V>: PickupHooks<I, K, V> {
+    /// Native drop uses throwRandomly=false and Prediction::PREDICTED.
+    fn drop_predicted(
+        &mut self,
+        inventory: &mut PlayerInventory<I, K, V>,
+        stack: StackRef<I, K, V>,
+    ) -> Result<(), Self::Error>;
+}
+pub fn deliver<I: Copy + Eq, K: Clone + Eq, V: Clone + PartialEq, H: ExtraItemHooks<I, K, V>>(
+    inventory: &mut PlayerInventory<I, K, V>,
+    stack: StackRef<I, K, V>,
+    hooks: &mut H,
+) -> Result<(), PickupError<H::Error>> {
+    if !inventory_pickup::add(inventory, -1, &stack, hooks)? {
+        hooks
+            .drop_predicted(inventory, stack)
+            .map_err(PickupError::Callback)?;
+    }
+    Ok(())
+}

crates/horizon-world/src/lib.rs

@@ -35,6 +35,7 @@ pub mod entity_fluid;
 pub mod entity_fluid_tick;
 pub mod entity_move;
 pub mod entity_obstruction;
+pub mod extra_items;
 pub mod fall_damage;
 pub mod fluid;
 pub mod fluid_box;

docs/collision-geometry.md

@@ -1920,3 +1920,20 @@ copies, empty aliases and mutations/failures at each effect boundary. The
 retains **353,264 matching lines per JAR**. Targeted Clippy passes. Item handlers
 and actor extra-item delivery remain controlled; concrete consumables, full
 inventory-use binding, contained schemas and complete gameplay remain pending.
+
+
+`extra_items::deliver` connects server-player remainder delivery to actual
+inventory pickup. Failed insertion reaches the predicted drop service with the
+same remaining stack; successful insertion retains native count consumption and
+slot aliases. The drop service represents throwRandomly=false and
+Prediction::PREDICTED.
+
+`python3 tools/test_extra_items_parity.py` composes native item completion,
+remainders and cooldowns with inherited ServerPlayer extra-item handling and
+real Inventory/PlayerEquipment. The
+[delivery report](../benchmarks/rust-extra-items-2026-10-07/scoped-parity.json)
+records **272,124 matching lines per JAR**, including full/partially filled
+inventories, offhand merging, aliased slots, creative material queries, partial
+insertion and callback failures. Targeted Clippy passes. Drop arguments are
+verified, but entity spawning remains controlled. Concrete item handlers, full
+contained schemas, complete use lifecycle and full gameplay remain pending.

mods/horizon/src/test/java/dev/horizonlab/parity/VanillaExtraItemsOracle.java

@@ -0,0 +1,29 @@
+package dev.horizonlab.parity;
+import com.google.gson.*;import java.io.*;import java.lang.reflect.*;import java.nio.file.*;import java.util.*;
+import net.minecraft.core.*;import net.minecraft.core.component.*;import net.minecraft.resources.Identifier;import net.minecraft.world.item.*;import net.minecraft.world.item.component.*;import net.minecraft.world.entity.*;import net.minecraft.world.entity.player.Player;import net.minecraft.world.level.*;
+/** Real ItemStack.finishUsingItem, UseRemainder/template and UseCooldown/ItemCooldowns composition. */
+public final class VanillaExtraItemsOracle {
+ static Object unsafe;static Method allocate;static Field count,tick,map,start,end;static Constructor<ItemStack> stackCtor;
+ static Field field(Class<?> c,String n)throws Exception{var f=c.getDeclaredField(n);f.setAccessible(true);return f;}
+ static <T>T make(Class<T> c)throws Exception{return c.cast(allocate.invoke(unsafe,c));}
+ static int n(JsonObject v,String k){return v.get(k).getAsInt();}
+ static final class Stop extends RuntimeException{}
+ static UseCooldown cooldown(JsonObject v){return v.get("cooldown").isJsonNull()?null:new UseCooldown(Float.intBitsToFloat((int)v.get("cooldown").getAsLong()),n(v,"group")<0?Optional.empty():Optional.of(Identifier.parse("test:group"+n(v,"group"))));}
+ static ItemStackTemplate template(JsonObject v){if(v.get("remainder").isJsonNull())return null;var p=DataComponentPatch.builder();if(!v.get("maximum").isJsonNull())p.set(DataComponents.MAX_STACK_SIZE,n(v,"maximum"));if(v.get("damage").getAsBoolean())p.set(DataComponents.MAX_DAMAGE,0);return new ItemStackTemplate(Items.STICK.builtInRegistryHolder(),n(v,"remainder"),p.build());}
+ static void components(ItemStack s,JsonObject v){var t=template(v);s.set(DataComponents.USE_REMAINDER,t==null?null:new UseRemainder(t));s.set(DataComponents.USE_COOLDOWN,cooldown(v));}
+ static final class Custom extends Item{Data d;Custom(){super(null);}@Override public ItemStack finishUsingItem(ItemStack s,Level l,LivingEntity actor){d.event("finish");return d.refs[n(d.config(),"finish")];}}
+ static final class Actor extends net.minecraft.server.level.ServerPlayer{Data d;Actor(){super(null,null,null,null);}@Override public GameType gameMode(){return GameType.SURVIVAL;}@Override public boolean isSpectator(){return false;}@Override public boolean isCreative(){return false;}@Override public boolean hasInfiniteMaterials(){d.event("infinite");return d.config().get("infinite").getAsBoolean();}@Override public void handleExtraItemsCreatedOnUse(ItemStack stack){d.extra=stack;d.event("extra");super.handleExtraItemsCreatedOnUse(stack);}@Override public net.minecraft.world.entity.player.Inventory getInventory(){return d.inv;}@Override public net.minecraft.world.entity.item.ItemEntity drop(ItemStack stack,boolean random,net.minecraft.util.Prediction prediction){if(random||prediction!=net.minecraft.util.Prediction.PREDICTED)throw new AssertionError();d.dropped=stack;d.event("drop");return null;}@Override public ItemCooldowns getCooldowns(){d.event("get-cooldowns");return d.book;}}
+ static final class Other extends net.minecraft.world.entity.decoration.ArmorStand{Data d;Other(){super(null,null);}@Override public boolean hasInfiniteMaterials(){d.event("infinite");return d.config().get("infinite").getAsBoolean();}@Override public void handleExtraItemsCreatedOnUse(ItemStack stack){d.extra=stack;d.event("extra");}}
+ static final class Book extends ItemCooldowns{Data d;@Override public void addCooldown(ItemStack stack,int ticks){d.original=stack;d.event("add-cooldown "+ticks);super.addCooldown(stack,ticks);}@Override protected void onCooldownStarted(Identifier group,int ticks){d.event("started "+group+" "+ticks);}}
+ static final class Data{
+  JsonObject f;PrintWriter out;ItemStack[] refs;ItemStack extra,original,result,dropped;net.minecraft.world.entity.player.Inventory inv;Book book;boolean changed;int calls;
+  JsonObject config(){return f.getAsJsonObject(changed?"after":"initial");}
+  String snapshot(ItemStack s){if(s==null)return "none";try{var remainder=s.get(DataComponents.USE_REMAINDER);var c=s.get(DataComponents.USE_COOLDOWN);return (s==ItemStack.EMPTY)+" "+(s.getItem()==Items.AIR?0:s.getItem()==Items.STICK?2:1)+" "+count.getInt(s)+" "+s.getCount()+" "+s.getPopTime()+" "+(remainder==null?"none":remainder.convertInto().count()+":"+remainder.convertInto().getMaxStackSize())+" "+(c==null?"none":Integer.toUnsignedString(Float.floatToIntBits(c.seconds()))+":"+c.cooldownGroup().map(Object::toString).orElse("none"));}catch(Exception e){throw new AssertionError(e);}}
+  void all(){try{out.println("state "+calls+" "+changed+" "+tick.getInt(book));var slots=new ItemStack[]{refs[0],refs[1],refs[2],extra,original,result,dropped};for(int i=0;i<slots.length;i++)out.println("ref "+i+" "+snapshot(slots[i]));var same=new StringJoiner(",");for(int a=0;a<slots.length;a++)for(int b=a+1;b<slots.length;b++)same.add(Boolean.toString(slots[a]==slots[b]));out.println("same "+same);var entries=new StringJoiner(",");for(var e:((Map<Identifier,?>)map.get(book)).entrySet())entries.add(e.getKey()+"="+start.getInt(e.getValue())+":"+end.getInt(e.getValue()));out.println("cooldowns "+entries);var contents=new StringJoiner(" | ");for(int i=0;i<43;i++){var item=inv.getItem(i);if(item!=ItemStack.EMPTY){var aliases=new StringJoiner(",");for(var ref:slots)aliases.add(Boolean.toString(item==ref));contents.add(i+"="+snapshot(item)+" ["+aliases+"]");}}out.println("inventory "+inv.getSelectedSlot()+" | "+contents);}catch(Exception e){throw new AssertionError(e);}}
+  void reset(){try{var c=config();Items.STICK.builtInRegistryHolder().bindComponents(DataComponentMap.builder().set(DataComponents.MAX_STACK_SIZE,n(c,"prototype_max")).build());for(int i=0;i<2;i++){var v=c.getAsJsonArray("items").get(i).getAsJsonObject();refs[i].setCount(n(v,"count"));components(refs[i],v);}tick.setInt(book,n(c,"clock"));inv.clearContent();inv.setSelectedSlot(n(c,"selected"));for(var sv:c.getAsJsonArray("slots")){var pair=sv.getAsJsonArray();inv.setItem(pair.get(0).getAsInt(),refs[pair.get(1).getAsInt()]);}if(extra!=null)extra.setCount(n(c,"extra_count"));if(original!=null){original.setCount(n(c,"original_count"));components(original,c.getAsJsonArray("items").get(1).getAsJsonObject());}}catch(Exception e){throw new AssertionError(e);}}
+  void event(String name){out.println("event "+name);int index=calls++;all();if(index==n(f,"fail"))throw new Stop();if(index==n(f,"mutate")){changed=true;reset();}}
+ }
+ public static void main(String[] args)throws Exception{net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();Items.AIR.builtInRegistryHolder().bindComponents(DataComponentMap.EMPTY);var u=Class.forName("sun.misc.Unsafe");unsafe=field(u,"theUnsafe").get(null);allocate=u.getMethod("allocateInstance",Class.class);count=field(ItemStack.class,"count");tick=field(ItemCooldowns.class,"tickCount");map=field(ItemCooldowns.class,"cooldowns");var ci=Class.forName("net.minecraft.world.item.ItemCooldowns$CooldownInstance");start=field(ci,"startTime");end=field(ci,"endTime");stackCtor=ItemStack.class.getDeclaredConstructor(Holder.class,int.class,PatchedDataComponentMap.class);stackCtor.setAccessible(true);Path dir=Path.of(args[1]);
+ try(var out=new PrintWriter(Files.newBufferedWriter(dir.resolve(args[0]+".txt")));var lines=Files.lines(dir.resolve("inputs.txt"))){for(var line:(Iterable<String>)lines::iterator){var d=new Data();d.f=JsonParser.parseString(line).getAsJsonObject();d.out=out;var custom=make(Custom.class);custom.d=d;ItemStack.EMPTY.setCount(0);ItemStack.EMPTY.setPopTime(0);var initial=d.config();Items.STICK.builtInRegistryHolder().bindComponents(DataComponentMap.builder().set(DataComponents.MAX_STACK_SIZE,n(initial,"prototype_max")).build());d.refs=new ItemStack[]{stackCtor.newInstance(Holder.direct(custom),1,new PatchedDataComponentMap(DataComponentMap.EMPTY)),new ItemStack(Items.STICK),ItemStack.EMPTY};d.refs[0].setPopTime(5);d.refs[1].setPopTime(7);d.book=new Book();d.book.d=d;var actor=make(Actor.class);actor.d=d;d.inv=new net.minecraft.world.entity.player.Inventory(actor,new net.minecraft.world.entity.player.PlayerEquipment(actor));d.reset();var other=make(Other.class);other.d=d;d.all();try{d.result=d.refs[n(d.f,"source")].finishUsingItem(null,d.f.get("player").getAsBoolean()?actor:other);out.println("result ok");}catch(Stop|net.minecraft.ReportedException e){out.println("result callback");}d.all();}
+ }}
+}

tools/test_extra_items_parity.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+"""Compare native extra-item deliverys and strict scalar stack validation."""
+import argparse
+import json
+import os
+from pathlib import Path
+import platform
+import subprocess
+import random
+import struct
+import math
+try:
+    from . import lab, test_rust_parity as base
+except ImportError:
+    import lab
+    import test_rust_parity as base
+
+
+def corpus():
+    edges=[-2147483648,-1,0,1,2,64,2147483647]
+    def item(count=2,remainder=1,maximum=None,damage=False,cooldown=0x3f800000,group=0):return dict(count=count,remainder=remainder,maximum=maximum,damage=damage,cooldown=cooldown,group=group)
+    def config(items=None,**kw):
+        v=dict(items=items or [item(),item(1,None,cooldown=None)],finish=0,infinite=False,prototype_max=64,clock=0,extra_count=2,original_count=3,selected=0,slots=[]);v.update(kw);return v
+    def row(initial=None,after=None,**kw):
+        v=dict(initial=initial or config(),after=after or config([item(1,None,cooldown=None),item(2,None,cooldown=0x40000000,group=1)]),source=0,player=True,fail=-1,mutate=-1);v.update(kw);return v
+    for count in edges:
+        for finish in range(3):
+            for infinite in [False,True]:
+                for player in [False,True]:
+                    for mutate in [-1,0,1,2,3,4,5]:
+                        for fail in [-1,0,1,2,3,4,5]:
+                            yield row(config([item(count),item(1,None,cooldown=None)],finish=finish,infinite=infinite),source=0,player=player,mutate=mutate,fail=fail)
+    for existing in [0,1,63,64]:
+        for remainder in [1,2,64]:
+            for occupied in [0,1,35,36]:
+                for offhand in [False,True]:
+                    for infinite in [False,True]:
+                        initial=config([item(2,remainder),item(existing,None,cooldown=None)],slots=[[i,1] for i in range(occupied)]+([[40,1]] if offhand else []))
+                        after=config([item(1,remainder),item(existing,None,cooldown=None)],slots=initial['slots'],infinite=infinite)
+                        yield row(initial,after,mutate=0)
+    rng=random.Random(0x4146544552555345)
+    def random_item():return item(rng.choice(edges),rng.choice([None,-1,1,2,64,2147483647]),rng.choice([None,*edges]),bool(rng.randrange(2)),rng.choice([None,0,0x80000000,0x3d4ccccd,0x7f800000,0xff800000,0x7fc00000,rng.randrange(0x100000000)]),rng.randrange(-1,4))
+    def random_config():return config([random_item(),random_item()],finish=rng.randrange(3),infinite=bool(rng.randrange(2)),prototype_max=rng.choice(edges),clock=rng.choice(edges),extra_count=rng.choice(edges),original_count=rng.choice(edges))
+    for _ in range(2400):
+        initial=random_config();after=random_config()
+        for c in [initial,after]:
+            c['selected']=rng.randrange(9)
+            c['slots']=[[i,rng.randrange(3)] for i in rng.sample(range(43),rng.randrange(44))]
+        yield row(initial,after,source=rng.randrange(3),player=bool(rng.randrange(2)),mutate=rng.randrange(-1,9),fail=rng.randrange(-1,9))
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-extra-items-parity';build.mkdir(parents=True,exist_ok=True)
+    report_path=build/'report.json';report_path.unlink(missing_ok=True)
+    if args.prepare:lab.prepare()
+    lock,jars,libraries=base.verify_artifacts()
+    oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaExtraItemsOracle.java'
+    sources=[oracle,Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/lab.py',lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-core/Cargo.toml',lab.ROOT/'crates/horizon-world/Cargo.toml',*sorted((lab.ROOT/'crates/horizon-core/src').rglob('*.rs')),*sorted((lab.ROOT/'crates/horizon-world/src').rglob('*.rs')),lab.ROOT/'crates/horizon-world/examples/extra_items_fixture.rs']
+    tested_sources=base.source_hashes(sources)
+    classes=build/'classes';classes.mkdir(exist_ok=True)
+    def run(command,name):
+        with (build/(name+'.log')).open('w',encoding='utf-8') as log:base.run(list(map(str,command)),stdout=log,stderr=subprocess.STDOUT)
+    dependency_path=os.pathsep.join(map(str,libraries))
+    run(['javac','--release',lock['minecraft']['java_major'],'-proc:none','-cp',str(jars['server'])+os.pathsep+dependency_path,'-d',classes,oracle],'compile-java')
+    def java(side,mode,path):
+        run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jars[side]),dependency_path]),'dev.horizonlab.parity.VanillaExtraItemsOracle',mode,path],side+'-'+mode)
+    fixtures=list(corpus());inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
+    fixture_paths=[inputs];tested_fixtures=base.source_hashes(fixture_paths)
+    run(['cargo','build','--release','-p','horizon-world','--example','extra_items_fixture'],'compile-rust')
+    metadata=json.loads(subprocess.check_output(['cargo','metadata','--no-deps','--format-version','1'],cwd=lab.ROOT,text=True))
+    binary=Path(metadata['target_directory'])/'release/examples'/('extra_items_fixture.exe' if os.name=='nt' else 'extra_items_fixture')
+    run([binary,build],'rust');references=[]
+    for side,jar in jars.items():
+        java(side,side,build);reference=build/f'{side}.txt';matched=base.compare(reference,build/'rust.txt')
+        references.append({'side':side,'jar_sha256':lab.digest(jar,'sha256'),'output_sha256':lab.digest(reference,'sha256'),'matched_output_lines':matched})
+        print(f'{side}: {matched:,} extra-item delivery output lines match Rust',flush=True)
+    base.ensure_sources_unchanged(sources,tested_sources);base.ensure_sources_unchanged(fixture_paths,tested_fixtures)
+    report={'schema':1,'minecraft':lock['minecraft']['version'],'manifest_sha1':lock['minecraft']['manifest_sha1'],'platform':platform.platform(),'java':subprocess.check_output(['java','--version'],text=True).splitlines()[0],'rustc':subprocess.check_output(['rustc','--version'],text=True).strip(),'fixtures':len(fixtures),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'references':references,'scope':'Actual ItemStack.finishUsingItem with validated remainders and cooldowns now invokes inherited ServerPlayer.handleExtraItemsCreatedOnUse and real Inventory/PlayerEquipment insertion. Shared item/component references, occupied/aliased slots, offhand merging, creative material queries, partial insertion and the drop fallback are compared through mutation/failure prefixes. The drop call verifies throwRandomly=false and predicted semantics; its entity-spawn body is controlled. Rust composes item-after-use and inventory pickup. Item handlers, full contained schemas, dropped-entity creation, complete use lifecycle and full gameplay remain pending.'}
+    lab.write_json(report_path,report);print(f'Scoped extra-item delivery parity passed: {report_path}')
+
+
+if __name__=='__main__':main()