feat(extract): build containment tree and traverse all containers

Add buildTree to mirror how TTS nests objects, with a display label
(Nickname or class Name). Generalize traverseMod to descend into any
object with ContainedObjects, not just bags, and add Nickname to
TTSObject.

packages/extract/src/objects.test.ts

@@ -1,6 +1,11 @@
 import { describe, expect, it } from 'vitest';
 import type { TTSMod, TTSObject } from '@tts/shared';
-import { filterObjects, findObject, flattenObjects } from './objects.js';
+import {
+  buildTree,
+  filterObjects,
+  findObject,
+  flattenObjects,
+} from './objects.js';
 
 function card(guid: string, name = 'Card'): TTSObject {
   return { Name: name, GUID: guid, Description: '' };
@@ -21,14 +26,15 @@ const mod: TTSMod = {
 };
 
 describe('flattenObjects', () => {
-  it('returns every object including those inside bags', () => {
+  it('returns every object including containers and those inside them', () => {
     const guids = flattenObjects(mod).map((o) => o.GUID);
-    expect(guids).toEqual(['a', 'c', 'd', 'e']);
+    expect(guids).toEqual(['a', 'b', 'c', 'd', 'e']);
   });
 
   it('sets Parent links before returning', () => {
-    const [a, c] = flattenObjects(mod);
+    const [a, b, c] = flattenObjects(mod);
     expect(a!.Parent).toBeUndefined();
+    expect(b!.Parent).toBeUndefined();
     expect(c!.Parent!.GUID).toBe('b');
   });
 });
@@ -48,4 +54,26 @@ describe('findObject', () => {
   it('returns undefined for a missing GUID', () => {
     expect(findObject(mod, 'zzz')).toBeUndefined();
   });
+});
+
+describe('buildTree', () => {
+  it('mirrors the containment hierarchy', () => {
+    const tree = buildTree(mod);
+    expect(tree.map((n) => n.object.GUID)).toEqual(['a', 'b', 'e']);
+    expect(tree[1]!.children.map((n) => n.object.GUID)).toEqual(['c', 'd']);
+  });
+
+  it('uses Nickname as the label when present', () => {
+    const named = {
+      ...card('n', 'Card'),
+      Nickname: 'Ace of Spades',
+    };
+    const tree = buildTree({ ...mod, ObjectStates: [named] });
+    expect(tree[0]!.label).toBe('Ace of Spades');
+  });
+
+  it('falls back to the class Name as the label', () => {
+    const tree = buildTree(mod);
+    expect(tree[0]!.label).toBe('Deck');
+  });
 });

packages/extract/src/objects.ts

@@ -1,6 +1,33 @@
 import type { TTSMod, TTSObject } from '@tts/shared';
 import { markParent, traverseMod } from './traverse.js';
 
+/** A node in the containment tree of a save. */
+export interface ObjectTreeNode {
+  object: TTSObject;
+  /** Display label: `Nickname` when present, else the class `Name`. */
+  label: string;
+  children: ObjectTreeNode[];
+}
+
+/**
+ * Build the containment tree of a save, mirroring how TTS nests objects.
+ * Each node carries its object plus a display label and its children.
+ */
+export function buildTree(mod: TTSMod): ObjectTreeNode[] {
+  for (const state of mod.ObjectStates) {
+    markParent(state);
+  }
+  return mod.ObjectStates.map(nodeFrom);
+}
+
+function nodeFrom(o: TTSObject): ObjectTreeNode {
+  return {
+    object: o,
+    label: o.Nickname || o.Name,
+    children: (o.ContainedObjects ?? []).map(nodeFrom),
+  };
+}
+
 /**
  * Flatten all objects in a save into an array.
  * Ensures parent links are set before returning.

packages/extract/src/traverse.test.ts

@@ -43,9 +43,9 @@ describe('markParent', () => {
 });
 
 describe('traverseMod', () => {
-  it('yields every non-bag object in order', () => {
+  it('yields every object including containers, in order', () => {
     const guids = [...traverseMod(mod)].map((o) => o.GUID);
-    expect(guids).toEqual(['a', 'c', 'e', 'f']);
+    expect(guids).toEqual(['a', 'b', 'c', 'd', 'e', 'f']);
   });
 
   it('descends into nested bags', () => {
@@ -53,8 +53,14 @@ describe('traverseMod', () => {
     expect(guids).toContain('e');
   });
 
+  it('descends into any object with ContainedObjects', () => {
+    const custom = { Name: 'Custom_Model', GUID: 'x', Description: '', ContainedObjects: [card('y')] };
+    const guids = [...traverseMod(custom)].map((o) => o.GUID);
+    expect(guids).toEqual(['x', 'y']);
+  });
+
   it('accepts a single object', () => {
     const guids = [...traverseMod(bag('b', [card('c')]))].map((o) => o.GUID);
-    expect(guids).toEqual(['c']);
+    expect(guids).toEqual(['b', 'c']);
   });
 });

packages/extract/src/traverse.ts

@@ -14,8 +14,8 @@ export function markParent(o: TTSObject): void {
 }
 
 /**
- * Yield every object in a save, descending into Bags and Custom_Model_Bags.
- * Accepts either a full `TTSMod` or a single `TTSObject`.
+ * Yield every object in a save, descending into any object with
+ * `ContainedObjects`. Accepts either a full `TTSMod` or a single `TTSObject`.
  */
 export function* traverseMod(
   mod: TTSMod | TTSObject,
@@ -24,11 +24,10 @@ export function* traverseMod(
     for (const one of mod.ObjectStates) {
       yield* traverseMod(one);
     }
-  } else if (mod.Name === 'Bag' || mod.Name === 'Custom_Model_Bag') {
+  } else {
+    yield mod;
     for (const one of mod.ContainedObjects ?? []) {
       yield* traverseMod(one);
     }
-  } else {
-    yield mod;
   }
 }

packages/shared/src/types.ts

@@ -3,7 +3,10 @@
  * Mirrors the structure produced by BSON-deserializing a TTS save.
  */
 export interface TTSObject {
+  /** The object's class/type, e.g. `Card`, `Bag`, `Custom_Model`. */
   Name: string;
+  /** The display name; often empty in saves, so fall back to `Name`. */
+  Nickname?: string;
   GUID: string;
   Description: string;
   /** Set by `markParent` during traversal; not present in the raw save. */