feat: File* save/load actions, hashlib/uuid, dict spread and small renpy helpers in the player

Games with their own save screens work: FileAction/FileSave/FileLoad/FileDelete/FilePage*, FileLoadable,
FileTime, FileSaveName, FileJson and friends use browser slots (a slot has no screenshot). Added
renpy.has_image/has_screen/list_files/get_mouse_pos/log/jump_out_of_context/random.seed,
renpy.translation.translate_string, type/id/vars/Flatten/LiveComposite/Composite, bare defaultdict/
deepcopy, md5/sha256 (checked against test vectors), uuid4, time.monotonic, re.compile().fullmatch,
math.isfinite and `{**a, "k": v}`. The converter whitelists them and accepts the hashlib/uuid imports.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

frontend/src/player/engine.ts

@@ -170,9 +170,19 @@ export class Engine {
     this.renderer.fit(this.container);
     window.addEventListener("keydown", this.onKey);
     window.addEventListener("keyup", this.onKeyUp);
+    window.addEventListener("pointermove", this.onPointer);
   }
 
+  /** The pointer in the game's own coordinates (`renpy.get_mouse_pos`). */
+  private mousePos: [number, number] = [0, 0];
+  private onPointer = (event: PointerEvent) => {
+    const box = this.container.getBoundingClientRect();
+    const [w, h] = this.game.resolution ?? [1920, 1080];
+    if (box.width && box.height) this.mousePos = [Math.round((event.clientX - box.left) * w / box.width), Math.round((event.clientY - box.top) * h / box.height)];
+  };
+
   destroy() {
+    window.removeEventListener("pointermove", this.onPointer);
     this.liveImages?.destroy();
     this.screens.destroy();
     this.gen++;
@@ -338,7 +348,18 @@ export class Engine {
     const kwless = (args: any[]) =>
       args.length && args[args.length - 1]?.__kw ? args.slice(0, -1) : args;
     const kwOf = (args: any[]) => (args.length && args[args.length - 1]?.__kw) || {};
-    const makeRandom = (next: () => number): Record<string, any> => {
+    const seeded = (seed: any) => {
+      let state = [...String(seed)].reduce((h, c) => (Math.imul(h, 31) + c.charCodeAt(0)) | 0, 7) >>> 0;
+      return () => {
+        state = (state + 0x6d2b79f5) >>> 0;
+        let t = state;
+        t = Math.imul(t ^ (t >>> 15), t | 1);
+        t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
+        return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
+      };
+    };
+    const makeRandom = (source: () => number): Record<string, any> => {
+      let next = source;
       const below = (n: number) => Math.floor(next() * n);
       const self: Record<string, any> = {
         randint: (a: number, b: number) => a + below(b - a + 1),
@@ -383,19 +404,11 @@ export class Engine {
           }
         },
         uniform: (a: number, b: number) => a + next() * (b - a),
-        seed: () => null,
+        seed: (seed?: any) => { next = seed === undefined || seed === null ? Math.random : seeded(seed); return null; },
       };
       // `rng = renpy.random.Random(seed)`: an independent generator; a given seed makes it repeatable
       self.Random = (seed?: any) => {
-        if (seed === undefined || seed === null) return makeRandom(Math.random);
-        let state = [...String(seed)].reduce((h, c) => (Math.imul(h, 31) + c.charCodeAt(0)) | 0, 7) >>> 0;
-        return makeRandom(() => {
-          state = (state + 0x6d2b79f5) >>> 0;
-          let t = state;
-          t = Math.imul(t ^ (t >>> 15), t | 1);
-          t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
-          return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
-        });
+        return makeRandom(seed === undefined || seed === null ? Math.random : seeded(seed));
       };
       return self;
     };
@@ -427,7 +440,19 @@ export class Engine {
     });
     const renpyImpl: Record<string, any> = {
       random,
+      translation: { translate_string: (text: any, ...a: any[]) => this.tr.translateIn(pyStr(text), kwOf(a).language ?? kwless(a)[0] ?? null) },
       style: { rebuild: () => null },
+      // diagnostics only: nothing is written anywhere
+      log: () => null,
+      write_log: () => null,
+      get_filename_line: () => ["", 0],
+      has_image: (name: any) => this.resolveImage(pyStr(name).split(" ")) !== null,
+      has_screen: (name: any) => Boolean(this.game.screens?.[pyStr(name)]),
+      list_files: () => Object.keys(this.game.files ?? {}),
+      get_mouse_pos: () => [...this.mousePos],
+      jump_out_of_context: (label: string) => {
+        throw new JumpSignal("jump", label);
+      },
       image_size: (name: any) => {
         const text = pyStr(name);
         const resolved = this.resolveImage(text.split(" "));
@@ -584,7 +609,7 @@ export class Engine {
         log10: Math.log10, fmod: (a: number, b: number) => a % b,
         modf: (x: number) => [x - Math.trunc(x), Math.trunc(x)],
         degrees: (x: number) => (x * 180) / Math.PI, radians: (x: number) => (x * Math.PI) / 180,
-        isnan: Number.isNaN, isinf: (x: number) => x === Infinity || x === -Infinity,
+        isfinite: Number.isFinite, isnan: Number.isNaN, isinf: (x: number) => x === Infinity || x === -Infinity,
         copysign: (a: number, b: number) => Math.abs(a) * (b < 0 || Object.is(b, -0) ? -1 : 1),
       },
       len: (x: any) => (x instanceof PyDict ? x.map.size : x?.length ?? 0),
@@ -911,6 +936,16 @@ export class Engine {
       endReplay: () => this.endReplay(),
       quickSave: () => void this.save("quick"),
       quickLoad: () => void this.load("quick"),
+      slotInfo: (slot) => {
+        if (!this.slotsRead) { this.slotsRead = true; void this.refreshSlots(); }
+        const meta = this.slotCache.get(slot);
+        return meta ? { title: meta.title, time: meta.updated_at } : null;
+      },
+      saveSlot: (slot, confirm) => void this.saveFileSlot(slot, confirm),
+      loadSlot: (slot) => void this.load(slot),
+      deleteSlot: (slot, confirm) => void this.deleteFileSlot(slot, confirm),
+      get filePage() { return String(engine.persistent._file_page ?? "1"); },
+      set filePage(page: string) { engine.persistent._file_page = page; engine.screens.refresh(); },
       transform: (name) => this.game.transforms[name] ?? null,
       atl: (name) => this.game.atl?.[name] ?? null,
     };
@@ -1730,6 +1765,30 @@ export class Engine {
     };
   }
 
+  private slotCache = new Map<string, { title: string; updated_at: string }>();
+  private slotsRead = false;
+
+  /** Slot metadata for the File* actions of a game's own save screens (read once, then kept up to date). */
+  private async refreshSlots() {
+    try {
+      this.slotCache = new Map((await this.saves.list()).map((meta) => [meta.slot, meta]));
+    } catch { /* storage unavailable: slots look empty */ }
+    this.screens.refresh();
+  }
+
+  private async saveFileSlot(slot: string, confirm: boolean) {
+    if (confirm && this.slotCache.has(slot) && !(await this.confirmAsk("Перезаписать сохранение?", "Перезаписать"))) return;
+    await this.save(slot);
+    await this.refreshSlots();
+  }
+
+  private async deleteFileSlot(slot: string, confirm: boolean) {
+    if (!this.slotCache.has(slot)) return;
+    if (confirm && !(await this.confirmAsk("Удалить сохранение?", "Удалить"))) return;
+    await this.saves.remove(slot).catch(() => {});
+    await this.refreshSlots();
+  }
+
   private async save(slot: string, silent = false) {
     if (!this.running || !this.cur.label) return;
     const data = this.snapshotState();

frontend/src/player/pymodules.ts

@@ -98,7 +98,7 @@ class DateTime {
   isoformat() { return `${this.year}-${pad(this.month)}-${pad(this.day)}T${pad(this.hour)}:${pad(this.minute)}:${pad(this.second)}`; }
 }
 
-function strftime(format: string, d: Date): string {
+export function strftime(format: string, d: Date): string {
   const days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
   const months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
   return format.replace(/%([a-zA-Z%])/g, (_m, c: string) => {
@@ -176,6 +176,83 @@ Object.assign(DateTime.prototype, {
   },
 });
 
+function md5(bytes: Uint8Array): string {
+  const K = Array.from({ length: 64 }, (_, i) => Math.floor(Math.abs(Math.sin(i + 1)) * 2 ** 32) >>> 0);
+  const S = [7, 12, 17, 22, 5, 9, 14, 20, 4, 11, 16, 23, 6, 10, 15, 21];
+  let a0 = 0x67452301, b0 = 0xefcdab89, c0 = 0x98badcfe, d0 = 0x10325476;
+  const padded = new Uint8Array(((bytes.length + 8) >> 6 << 6) + 64);
+  padded.set(bytes);
+  padded[bytes.length] = 0x80;
+  const view = new DataView(padded.buffer);
+  view.setUint32(padded.length - 8, (bytes.length * 8) >>> 0, true);
+  view.setUint32(padded.length - 4, Math.floor(bytes.length * 8 / 2 ** 32), true);
+  for (let off = 0; off < padded.length; off += 64) {
+    const m = Array.from({ length: 16 }, (_, i) => view.getUint32(off + i * 4, true));
+    let a = a0, b = b0, c = c0, d = d0;
+    for (let i = 0; i < 64; i++) {
+      let f: number, g: number;
+      if (i < 16) { f = (b & c) | (~b & d); g = i; }
+      else if (i < 32) { f = (d & b) | (~d & c); g = (5 * i + 1) % 16; }
+      else if (i < 48) { f = b ^ c ^ d; g = (3 * i + 5) % 16; }
+      else { f = c ^ (b | ~d); g = (7 * i) % 16; }
+      f = (f + a + K[i] + m[g]) >>> 0;
+      a = d; d = c; c = b;
+      const s = S[(i >> 4) * 4 + (i % 4)];
+      b = (b + ((f << s) | (f >>> (32 - s)))) >>> 0;
+    }
+    a0 = (a0 + a) >>> 0; b0 = (b0 + b) >>> 0; c0 = (c0 + c) >>> 0; d0 = (d0 + d) >>> 0;
+  }
+  return [a0, b0, c0, d0].map((v) => [0, 8, 16, 24].map((sh) => ((v >>> sh) & 255).toString(16).padStart(2, "0")).join("")).join("");
+}
+
+function sha256(bytes: Uint8Array): string {
+  const K = Array.from({ length: 64 }, (_, i) => {
+    let n = 2, count = 0;
+    for (; count <= i; n++) if (Array.from({ length: n - 2 }, (_, d) => d + 2).every((d) => n % d)) count++;
+    return Math.floor((Math.cbrt(n - 1) % 1) * 2 ** 32) >>> 0;
+  });
+  const h = [2, 3, 5, 7, 11, 13, 17, 19].map((p) => Math.floor((Math.sqrt(p) % 1) * 2 ** 32) >>> 0);
+  const padded = new Uint8Array(((bytes.length + 8) >> 6 << 6) + 64);
+  padded.set(bytes);
+  padded[bytes.length] = 0x80;
+  const view = new DataView(padded.buffer);
+  view.setUint32(padded.length - 8, Math.floor(bytes.length * 8 / 2 ** 32));
+  view.setUint32(padded.length - 4, (bytes.length * 8) >>> 0);
+  const rotr = (x: number, n: number) => (x >>> n) | (x << (32 - n));
+  for (let off = 0; off < padded.length; off += 64) {
+    const w = Array.from({ length: 64 }, (_, i) => (i < 16 ? view.getUint32(off + i * 4) : 0));
+    for (let i = 16; i < 64; i++) {
+      const s0 = rotr(w[i - 15], 7) ^ rotr(w[i - 15], 18) ^ (w[i - 15] >>> 3);
+      const s1 = rotr(w[i - 2], 17) ^ rotr(w[i - 2], 19) ^ (w[i - 2] >>> 10);
+      w[i] = (w[i - 16] + s0 + w[i - 7] + s1) >>> 0;
+    }
+    let [a, b, c, d, e, f, g, hh] = h;
+    for (let i = 0; i < 64; i++) {
+      const t1 = (hh + (rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25)) + ((e & f) ^ (~e & g)) + K[i] + w[i]) >>> 0;
+      const t2 = ((rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22)) + ((a & b) ^ (a & c) ^ (b & c))) >>> 0;
+      hh = g; g = f; f = e; e = (d + t1) >>> 0; d = c; c = b; b = a; a = (t1 + t2) >>> 0;
+    }
+    [a, b, c, d, e, f, g, hh].forEach((v, i) => { h[i] = (h[i] + v) >>> 0; });
+  }
+  return h.map((v) => v.toString(16).padStart(8, "0")).join("");
+}
+
+/** `hashlib.md5(data)`: the data may come later through `update`. */
+class Hash {
+  private parts: Uint8Array[] = [];
+  constructor(private digest: (bytes: Uint8Array) => string, data?: any) { if (data !== undefined) this.update(data); }
+  update(data: any) {
+    this.parts.push(typeof data === "string" ? new TextEncoder().encode(data) : Uint8Array.from(data ?? []));
+    return null;
+  }
+  hexdigest() {
+    const all = new Uint8Array(this.parts.reduce((n, p) => n + p.length, 0));
+    let at = 0;
+    for (const p of this.parts) { all.set(p, at); at += p.length; }
+    return this.digest(all);
+  }
+}
+
 /** Namespaces added to the sandbox's builtins. */
 export function pythonModules(): Record<string, any> {
   const re = {
@@ -186,6 +263,7 @@ export function pythonModules(): Record<string, any> {
       match: (s: string) => re.match(pattern, s, flags),
       sub: (r: string, s: string) => re.sub(pattern, r, s, 0, flags),
       findall: (s: string) => re.findall(pattern, s, flags),
+      fullmatch: (s: string) => re.fullmatch(pattern, s, flags),
       split: (s: string) => re.split(pattern, s, 0, flags),
     }),
     search: (pattern: string, s: string, flags = 0) => {
@@ -196,6 +274,10 @@ export function pythonModules(): Record<string, any> {
       const m = compile(`^(?:${pattern})`, flags).exec(String(s));
       return m ? new ReMatch(m) : null;
     },
+    fullmatch: (pattern: string, s: string, flags = 0) => {
+      const m = compile(`^(?:${pattern})$`, flags).exec(String(s));
+      return m ? new ReMatch(m) : null;
+    },
     findall: (pattern: string, s: string, flags = 0) =>
       [...String(s).matchAll(compile(pattern, flags, true))].map((m) => (m.length > 2 ? m.slice(1) : m[1] ?? m[0])),
     sub: (pattern: string, replacement: any, s: string, count = 0, flags = 0) => {
@@ -220,6 +302,7 @@ export function pythonModules(): Record<string, any> {
     copy: { copy: (v: any) => (Array.isArray(v) ? [...v] : v instanceof PyDict ? new PyDict(v.map.entries()) : v), deepcopy: (v: any) => deepcopy(v) },
     time: {
       time: () => Date.now() / 1000,
+      monotonic: () => performance.now() / 1000,
       sleep: () => null,
       strftime: (format: string, t?: any) => strftime(format, t instanceof DateTime ? t.d : new Date()),
     },
@@ -229,5 +312,18 @@ export function pythonModules(): Record<string, any> {
       OrderedDict: () => new PyDict(),
     },
     functools: functionModules,
+    hashlib: {
+      md5: (data?: any) => new Hash(md5, data),
+      sha256: (data?: any) => new Hash(sha256, data),
+    },
+    uuid: {
+      uuid4: () => ({ hex: crypto.randomUUID().replaceAll("-", ""), toString: () => crypto.randomUUID() }),
+    },
+    // `from collections import defaultdict` and friends leave the bare names
+    defaultdict: (factory?: any) => new PyDefaultDict(typeof factory === "function" ? () => factory() : null),
+    OrderedDict: () => new PyDict(),
+    deepcopy: (v: any) => deepcopy(v),
+    partial,
+    timedelta,
   };
 }

frontend/src/player/python.ts

@@ -680,7 +680,17 @@ export class Python {
       case "tuple":
         return e.v.map((x: Expr) => this.eval(x));
       case "dict":
-        return new PyDict(e.v.map(([k, v]: [Expr, Expr]) => [this.eval(k), this.eval(v)]));
+        {
+          const out = new PyDict();
+          for (const [k, v] of e.v as [Expr, Expr][]) {
+            if (k.k === "star") {
+              const source = this.eval(k.v);
+              if (source instanceof PyDict) source.map.forEach((x, key) => out.map.set(key, x));
+              else if (source !== null) throw new Error("** ожидает словарь");
+            } else out.set(this.eval(k), this.eval(v));
+          }
+          return out;
+        }
       case "fmt":
         return e.v.map((p: any) => (typeof p === "string" ? p : pyStr(this.eval(p)))).join("");
       case "comp": {
@@ -1229,6 +1239,11 @@ export class Python {
       case "dict": {
         const out = new PyDict();
         for (const [k, v] of e.v as [Expr, Expr][]) {
+          if (k.k === "star") {
+            const source = yield* this.evalG(k.v);
+            if (source instanceof PyDict) source.map.forEach((x, key) => out.map.set(key, x));
+            continue;
+          }
           const key = yield* this.evalG(k);
           out.set(key, yield* this.evalG(v));
         }
@@ -1461,6 +1476,9 @@ export function decodeValue(v: any): any {
 }
 
 /** Builtins that need the interpreter: type checks, attribute access, callbacks. */
+const identities = new WeakMap<object, number>();
+let lastIdentity = 0;
+
 export function userBuiltins(py: Python): Record<string, any> {
   const split = (args: any[]) => {
     const last = args[args.length - 1];
@@ -1522,6 +1540,21 @@ export function userBuiltins(py: Python): Record<string, any> {
       py.bind({ k: "attr", o: { k: "const", v: o }, a: name }, value);
     },
     iter: (x: any) => [...iterate(x)],
+    type: (x: any) => {
+      if (x instanceof PyInstance) return x.cls;
+      if (x instanceof PyDict) return typeOf("dict");
+      if (Array.isArray(x)) return typeOf("list");
+      if (typeof x === "boolean") return typeOf("bool");
+      if (typeof x === "number") return typeOf(Number.isInteger(x) ? "int" : "float");
+      if (typeof x === "string") return typeOf("str");
+      return null;
+    },
+    id: (x: any) => {
+      if (x === null || typeof x !== "object") return typeof x === "number" ? x : 0;
+      if (!identities.has(x)) identities.set(x, ++lastIdentity);
+      return identities.get(x)!;
+    },
+    vars: (x: any) => (x instanceof PyInstance ? new PyDict(Object.entries(x.attrs)) : new PyDict()),
     hash: (x: any) => {
       const text = String(key(x));
       return [...text].reduce((h, c) => (Math.imul(h, 31) + c.charCodeAt(0)) | 0, 7);

frontend/src/player/screens.ts

@@ -8,6 +8,7 @@ import { isNativeAction } from "./musicroom";
 import { galleryClass } from "./gallery";
 import { parseExpression } from "./pyparse";
 import { movieDisplayable } from "./movie";
+import { strftime } from "./pymodules";
 import { PyDict, PyInstance, callableOf, pyEq, pyStr, truthy, type Python } from "./python";
 import type { AtSpec, Expr } from "./types";
 
@@ -43,6 +44,13 @@ export interface ScreenHost {
   openUrl(url: string): void;
   quickSave(): void;
   quickLoad(): void;
+  /** Slot metadata for File* actions; null when empty or not yet read. */
+  slotInfo(slot: string): { title: string; time: string } | null;
+  saveSlot(slot: string, confirm: boolean): void;
+  loadSlot(slot: string): void;
+  deleteSlot(slot: string, confirm: boolean): void;
+  /** The page of the save/load screen (`persistent._file_page`). */
+  filePage: string;
   startReplay(label: string, scope: Record<string, any> | null): void;
   endReplay(): void;
   setLanguage(code: string | null): void;
@@ -1406,6 +1414,11 @@ export class ScreenManager {
     this.refresh();
   }
 
+  /** The save slot a File* action means: its name on the current (or the given) page. */
+  private slotId(name: any, page?: any): string {
+    return `file:${page ?? this.host.filePage}-${pyStr(name)}`;
+  }
+
   private perform(action: any, screen: Instance | null) {
     if (action === null || action === undefined || action === false) return;
     if (Array.isArray(action)) {
@@ -1454,6 +1467,33 @@ export class ScreenManager {
         throw new ActionAbort();
       }
       case "EndReplay": this.host.endReplay(); throw new ActionAbort();
+      case "FileAction":
+      case "FileSave":
+      case "FileLoad": {
+        const slot = this.slotId(a, action.kw.page);
+        const loading = action.kind === "FileLoad" || (action.kind === "FileAction" && /load/i.test(owner?.name ?? ""));
+        const sure = truthy(action.kw.confirm ?? (action.kind === "FileLoad" ? b : false) ?? false);
+        if (loading) { this.host.loadSlot(slot); throw new ActionAbort(); }
+        this.host.saveSlot(slot, sure);
+        return;
+      }
+      case "FileDelete": this.host.deleteSlot(this.slotId(a, action.kw.page), truthy(action.kw.confirm ?? true)); return;
+      case "FileTakeScreenshot": return;
+      case "FilePage": this.host.filePage = String(a); return;
+      case "FilePageNext":
+      case "FilePagePrevious": {
+        const kw = action.kw;
+        const max = typeof kw.max === "number" ? kw.max : typeof a === "number" ? a : null;
+        const order = [...(kw.auto ?? true ? ["auto"] : []), ...(kw.quick ?? true ? ["quick"] : [])];
+        const numbered = max === null ? 0 : max;
+        const pages = [...order, ...Array.from({ length: numbered || 99 }, (_, i) => String(i + 1))];
+        const here = pages.indexOf(this.host.filePage);
+        const step = action.kind === "FilePageNext" ? 1 : -1;
+        let next = (here < 0 ? pages.indexOf("1") : here) + step;
+        if (next < 0 || next >= pages.length) next = truthy(kw.wrap) ? (next + pages.length) % pages.length : Math.max(0, Math.min(pages.length - 1, next));
+        this.host.filePage = pages[next];
+        return;
+      }
       case "QuickSave": this.host.quickSave(); return;
       case "QuickLoad": this.host.quickLoad(); throw new ActionAbort();
       case "ToggleScreenVariable": {
@@ -1532,7 +1572,37 @@ export class ScreenManager {
       "SetScreenVariable", "ToggleScreenVariable", "Show", "Hide", "ShowTransient", "Function", "NullAction", "Play",
       "Queue", "Stop", "Notify", "Quit", "MainMenu", "SelectedIf", "SensitiveIf", "ToggleScreen", "Language", "ShowMenu",
       "OpenURL", "SetLocalVariable", "QuickSave", "QuickLoad", "Replay", "EndReplay", "ToggleSetMembership",
-      "ToggleFocus", "PauseAudio", "SetMixer"]) out[kind] = make(kind);
+      "ToggleFocus", "PauseAudio", "SetMixer", "FileAction", "FileSave", "FileLoad", "FileDelete", "FileTakeScreenshot",
+      "FilePage", "FilePageNext", "FilePagePrevious"]) out[kind] = make(kind);
+    // values of the save/load screens; screenshots are not stored, so a slot has none
+    const kwOf = (a: any[]) => (a.length && a[a.length - 1]?.__kw) || {};
+    const slotOf = (a: any[]) => this.slotId(a[0], kwOf(a).page);
+    out.FileLoadable = (...a: any[]) => this.host.slotInfo(slotOf(a)) !== null;
+    out.FileUsedSlot = out.FileLoadable;
+    out.FileNewest = () => false;
+    out.FileSaveName = (...a: any[]) => this.host.slotInfo(slotOf(a))?.title ?? "";
+    out.FileTime = (...a: any[]) => {
+      const kw = kwOf(a), info = this.host.slotInfo(slotOf(a));
+      if (!info) return kw.empty ?? a[2] ?? "";
+      return strftime(String(kw.format ?? (typeof a[1] === "string" ? a[1] : "%b %d, %H:%M")), new Date(info.time));
+    };
+    out.FileJson = (...a: any[]) => {
+      const kw = kwOf(a), info = this.host.slotInfo(slotOf(a));
+      if (!info) return kw.empty ?? null;
+      return kw.key !== undefined ? kw.missing ?? null : new PyDict();
+    };
+    out.FileScreenshot = (...a: any[]) => kwOf(a).empty ?? null;
+    out.FileCurrentScreenshot = (...a: any[]) => kwOf(a).empty ?? null;
+    out.FileCurrentPage = () => this.host.filePage;
+    out.FilePageName = (...a: any[]) => {
+      const kw = kwOf(a), page = this.host.filePage;
+      return page === "auto" ? kw.auto ?? a[0] ?? "Auto " : page === "quick" ? kw.quick ?? a[1] ?? "Quick " : page;
+    };
+    out.FileSlotName = (slot: any, perPage: any) => {
+      const n = Number(slot) - 1, size = Number(perPage) || 1;
+      const page = Math.floor(n / size) + 1;
+      return `${page}-${(n % size) + 1}`;
+    };
     out.GetFocusRect = (id: any) => (this.focus?.id === pyStr(id) ? this.focus.rect : null);
     out.MixerValue = (mixer: any) => {
       return new BarValue(() => this.host.audio.mixerVolume(String(mixer)), () => 1, (v) => this.host.setMixer(String(mixer), v));
@@ -1589,6 +1659,9 @@ export class ScreenManager {
         { ...properties, idle: image, insensitive: image, sensitive: enabled, action }),
     });
     out.Fixed = shape("composite");
+    out.Composite = shape("composite");
+    out.LiveComposite = shape("composite");
+    out.Flatten = (child: any) => child; // flattening only changes how the browser composites, not what is drawn
     out.AlphaMask = shape("alphamask");
     out.TrackCursor = shape("trackcursor");
     out.At = (child: any) => child;