refactor: items

app/astride/traverse.js

@@ -6,6 +6,7 @@ export const TRAVERSAL_PATH = {
   BinaryExpression: ['left', 'right'],
   BlockStatement: ['body'],
   CallExpression: ['arguments', 'callee'],
+  ChainExpression: ['expression'],
   ConditionalExpression: ['alternate', 'consequent', 'test'],
   DoWhileStatement: ['body', 'test'],
   ExpressionStatement: ['expression'],

app/ecs-components/inventory.js

@@ -52,16 +52,20 @@ export default class Inventory extends Component {
   }
   async load(instance) {
     const Component = this;
-    const {readAsset} = this.ecs;
     const {slots} = instance;
     class ItemProxy {
-      constructor(slot, json) {
+      constructor(slot, json, scripts) {
         this.json = json;
+        this.scripts = scripts;
         this.slot = slot;
       }
       project(position, direction) {
-        const {TileLayers: {layers: [layer]}} = Component.ecs.get(1);
+        const {TileLayers} = Component.ecs.get(1);
+        const layer = TileLayers.layer(0);
         const {projection} = this.json;
+        if (!projection) {
+          return [];
+        }
         let startX = position.x;
         let startY = position.y;
         switch (direction) {
@@ -112,8 +116,15 @@ export default class Inventory extends Component {
             }
           }
         }
+        if (this.scripts.projectionCheckInstance) {
+          this.scripts.projectionCheckInstance.context.layer = layer;
+          this.scripts.projectionCheckInstance.context.projected = projected;
+          return this.scripts.projectionCheckInstance.evaluateSync();
+        }
+        else {
           return projected;
         }
+      }
       get qty() {
         return slots[this.slot].qty;
       }
@@ -128,15 +139,19 @@ export default class Inventory extends Component {
         }
       }
     }
-
     for (const slot in slots) {
-      const chars = await readAsset([slots[slot].source, 'item.json'].join('/'))
-      const json = chars.byteLength > 0
-        ? JSON.parse(
-          (new TextDecoder()).decode(chars),
-        )
-        : {};
-      instance.$$items[slot] = new ItemProxy(slots, json);
+      const json = await this.ecs.readJson(slots[slot].source);
+      const scripts = {};
+      if (json.projectionCheck) {
+        scripts.projectionCheckInstance = await this.ecs.readScript(json.projectionCheck);
+      }
+      if (json.start) {
+        scripts.startInstance = await this.ecs.readScript(json.start);
+      }
+      if (json.stop) {
+        scripts.stopInstance = await this.ecs.readScript(json.stop);
+      }
+      instance.$$items[slot] = new ItemProxy(slots, json, scripts);
     }
   }
   mergeDiff(original, update) {

app/ecs-components/wielder.js

@@ -1,5 +1,4 @@
 import Component from '@/ecs/component.js';
-import Script from '@/util/script.js';
 
 export default class Wielder extends Component {
   instanceFromSchema() {
@@ -15,20 +14,15 @@ export default class Wielder extends Component {
         const {Ticking} = entity;
         const activeItem = this.activeItem();
         if (activeItem) {
-          ecs.readAsset([activeItem.source, state ? 'start.js' : 'stop.js'].join('/'))
-            .then((code) => {
-              if (code.byteLength > 0) {
-                const context = {
-                  ecs,
-                  item: activeItem,
-                  wielder: entity,
-                };
-                Ticking.addTickingPromise(Script.tickingPromise((new TextDecoder()).decode(code), context));
+          const {startInstance, stopInstance} = activeItem.scripts;
+          const script = state ? startInstance : stopInstance;
+          if (script) {
+            script.context.ecs = ecs;
+            script.context.item = activeItem;
+            script.context.wielder = entity;
+            Ticking.addTickingPromise(script.tickingPromise());
           }
-            });
         }
-
-
       }
     }
   }

app/engine.js

@@ -5,6 +5,7 @@ import Ecs from '@/ecs/ecs.js';
 import Components from '@/ecs-components/index.js';
 import Systems from '@/ecs-systems/index.js';
 import {decode, encode} from '@/packets/index.js';
+import Script from '@/util/script.js';
 
 function join(...parts) {
   return parts.join('/');
@@ -33,9 +34,19 @@ export default class Engine {
     }
     const server = this.server = new SilphiusServer();
     this.Ecs = class EngineEcs extends Ecs {
-      readAsset(uri) {
+      async readAsset(uri) {
         return server.readAsset(uri);
       }
+      async readJson(uri) {
+        const chars = await this.readAsset(uri);
+        return chars.byteLength > 0 ? JSON.parse((new TextDecoder()).decode(chars)) : {};
+      }
+      async readScript(uri) {
+        const code = await this.readAsset(uri);
+        if (code.byteLength > 0) {
+          return Script.fromCode((new TextDecoder()).decode(code));
+        }
+      }
     }
     this.server.addPacketListener('Action', (connection, payload) => {
       this.incomingActions.push([this.connectedPlayers.get(connection).entity, payload]);
@@ -184,15 +195,15 @@ export default class Engine {
         slots: {
           1: {
             qty: 10,
-            source: '/assets/potion',
+            source: '/assets/potion/potion.json',
           },
           3: {
             qty: 1,
-            source: '/assets/tomato-seeds',
+            source: '/assets/tomato-seeds/tomato-seeds.json',
           },
           4: {
             qty: 1,
-            source: '/assets/hoe',
+            source: '/assets/hoe/hoe.json',
           },
         },
       },

app/react-components/slot.jsx

@@ -4,15 +4,14 @@ import styles from './slot.module.css';
  * An inventory slot. Displays an item image and the quantity of the item if > 1.
  */
 export default function Slot({
+  json,
   onClick,
   onDragEnter,
   onDragOver,
   onDragStart,
   onDrop,
   qty = 1,
-  source,
 }) {
-  const image = source + '/icon.png';
   return (
     <button
       className={styles.slot}
@@ -28,7 +27,7 @@ export default function Slot({
     >
       <div
         className={styles.slotInner}
-        style={image ? {backgroundImage: `url(${image})`} : {}}
+        style={json?.icon ? {backgroundImage: `url(${json.icon})`} : {}}
       >
         {qty > 1 && (
           <span

app/react-components/ui.jsx

@@ -176,7 +176,7 @@ export default function Ui({disconnected}) {
           setBufferSlot(entity.Inventory.slots[0]);
           const newHotbarSlots = emptySlots();
           for (let i = 1; i < 11; ++i) {
-            newHotbarSlots[i - 1] = entity.Inventory.slots[i];
+            newHotbarSlots[i - 1] = entity.Inventory.item(i);
           }
           setHotbarSlots(newHotbarSlots);
         }

app/routes/_main-menu.play.$.$/route.jsx

@@ -12,6 +12,7 @@ import Components from '@/ecs-components/index.js';
 import Systems from '@/ecs-systems/index.js';
 import Ui from '@/react-components/ui.jsx';
 import {juggleSession} from '@/session.server';
+import Script from '@/util/script.js';
 
 import {LRUCache} from 'lru-cache';
 
@@ -20,7 +21,7 @@ export const cache = new LRUCache({
 });
 
 class ClientEcs extends Ecs {
-  readAsset(uri) {
+  async readAsset(uri) {
     if (!cache.has(uri)) {
       let promise, resolve, reject;
       promise = new Promise((res, rej) => {
@@ -36,6 +37,16 @@ class ClientEcs extends Ecs {
     }
     return cache.get(uri);
   }
+  async readJson(uri) {
+    const chars = await this.readAsset(uri);
+    return chars.byteLength > 0 ? JSON.parse((new TextDecoder()).decode(chars)) : {};
+  }
+  async readScript(uri) {
+    const code = await this.readAsset(uri);
+    if (code.byteLength > 0) {
+      return Script.fromCode((new TextDecoder()).decode(code));
+    }
+  }
 }
 
 export async function loader({request}) {

public/assets/hoe/hoe.json

@@ -0,0 +1,11 @@
+{
+  "icon": "/assets/hoe/icon.png",
+  "projectionCheck": "/assets/hoe/projection-check.js",
+  "projection": {
+    "distance": [1, 0],
+    "grid": [
+      [1]
+    ]
+  },
+  "start": "/assets/hoe/start.js"
+}

public/assets/hoe/item.json

@@ -1,8 +0,0 @@
-{
-  "projection": {
-    "distance": [1, 0],
-    "grid": [
-      [1]
-    ]
-  }
-}

public/assets/hoe/projection-check.js

@@ -0,0 +1,10 @@
+const filtered = []
+
+for (let i = 0; i < projected.length; ++i) {
+  const tile = layer.tile(projected[i])
+  if ([1, 2, 3, 4, 6].includes(tile)) {
+    filtered.push(projected[i])
+  }
+}
+
+return filtered

public/assets/potion/potion.json

@@ -0,0 +1,3 @@
+{
+  "icon": "/assets/potion/icon.png"
+}

public/assets/tomato-seeds/item.json

@@ -1,10 +0,0 @@
-{
-  "projection": {
-    "distance": [1, -1],
-    "grid": [
-      [1, 1, 1],
-      [1, 1, 1],
-      [1, 1, 1]
-    ]
-  }
-}

public/assets/tomato-seeds/projection-check.js

@@ -0,0 +1,10 @@
+const filtered = []
+
+for (let i = 0; i < projected.length; ++i) {
+  const tile = layer.tile(projected[i])
+  if ([7].includes(tile)) {
+    filtered.push(projected[i])
+  }
+}
+
+return filtered

public/assets/tomato-seeds/tomato-seeds.json

@@ -0,0 +1,13 @@
+{
+  "icon": "/assets/tomato-seeds/icon.png",
+  "projection": {
+    "distance": [1, -1],
+    "grid": [
+      [1, 1, 1],
+      [1, 1, 1],
+      [1, 1, 1]
+    ]
+  },
+  "projectionCheck": "/assets/tomato-seeds/projection-check.js",
+  "start": "/assets/tomato-seeds/start.js"
+}