feat: t4g support

src/lib/assets/layouts/t4g.yml

@@ -0,0 +1,10 @@
+name: T4G
+col:
+  - row:
+      - switch: { e: 3, n: 5, w: 4, s: 6 }
+  - offset: [0.5, 0]
+    row:
+      - key: 2
+  - row:
+      - key: 0
+      - key: 1

src/lib/ccos/attachment.ts

@@ -0,0 +1,26 @@
+import type { Attachment } from "svelte/attachments";
+import { browser } from "$app/environment";
+import { persistentWritable } from "$lib/storage";
+
+export const emulatedCCOS = persistentWritable("emulatedCCOS", false);
+
+export function ccosKeyInterceptor() {
+  return ((element: Window) => {
+    const ccos = browser
+      ? import("./ccos").then((module) => module.fetchCCOS(".test"))
+      : Promise.resolve(undefined);
+
+    function onEvent(event: KeyboardEvent) {
+      ccos.then((it) => it?.handleKeyEvent(event));
+    }
+
+    element.addEventListener("keydown", onEvent, true);
+    element.addEventListener("keyup", onEvent, true);
+
+    return () => {
+      ccos.then((it) => it?.destroy());
+      element.removeEventListener("keydown", onEvent, true);
+      element.removeEventListener("keyup", onEvent, true);
+    };
+  }) satisfies Attachment<Window>;
+}

src/lib/ccos/ccos-events.ts

@@ -0,0 +1,37 @@
+export interface CCOSInitEvent {
+  type: "init";
+  url: string;
+}
+
+export interface CCOSKeyPressEvent {
+  type: "press";
+  code: number;
+}
+
+export interface CCOSKeyReleaseEvent {
+  type: "release";
+  code: number;
+}
+
+export interface CCOSSerialEvent {
+  type: "serial";
+  data: number;
+}
+
+export type CCOSInEvent =
+  | CCOSInitEvent
+  | CCOSKeyPressEvent
+  | CCOSKeyReleaseEvent
+  | CCOSSerialEvent;
+
+export interface CCOSReportEvent {
+  type: "report";
+  modifiers: number;
+  keys: number[];
+}
+
+export interface CCOSReadyEvent {
+  type: "ready";
+}
+
+export type CCOSOutEvent = CCOSReportEvent | CCOSReadyEvent | CCOSSerialEvent;

src/lib/ccos/ccos-interop.ts

@@ -0,0 +1,111 @@
+export const KEYCODE_TO_SCANCODE = new Map<string, number | undefined>(
+  Object.entries({
+    KeyA: 0x04,
+    KeyB: 0x05,
+    KeyC: 0x06,
+    KeyD: 0x07,
+    KeyE: 0x08,
+    KeyF: 0x09,
+    KeyG: 0x0a,
+    KeyH: 0x0b,
+    KeyI: 0x0c,
+    KeyJ: 0x0d,
+    KeyK: 0x0e,
+    KeyL: 0x0f,
+    KeyM: 0x10,
+    KeyN: 0x11,
+    KeyO: 0x12,
+    KeyP: 0x13,
+    KeyQ: 0x14,
+    KeyR: 0x15,
+    KeyS: 0x16,
+    KeyT: 0x17,
+    KeyU: 0x18,
+    KeyV: 0x19,
+    KeyW: 0x1a,
+    KeyX: 0x1b,
+    KeyY: 0x1c,
+    KeyZ: 0x1d,
+    Digit1: 0x1e,
+    Digit2: 0x1f,
+    Digit3: 0x20,
+    Digit4: 0x21,
+    Digit5: 0x22,
+    Digit6: 0x23,
+    Digit7: 0x24,
+    Digit8: 0x25,
+    Digit9: 0x26,
+    Digit0: 0x27,
+    Enter: 0x28,
+    Escape: 0x29,
+    Backspace: 0x2a,
+    Tab: 0x2b,
+    Space: 0x2c,
+    Minus: 0x2d,
+    Equal: 0x2e,
+    BracketLeft: 0x2f,
+    BracketRight: 0x30,
+    Backslash: 0x31,
+    Semicolon: 0x33,
+    Quote: 0x34,
+    Backquote: 0x35,
+    Comma: 0x36,
+    Period: 0x37,
+    Slash: 0x38,
+    CapsLock: 0x39,
+    F1: 0x3a,
+    F2: 0x3b,
+    F3: 0x3c,
+    F4: 0x3d,
+    F5: 0x3e,
+    F6: 0x3f,
+    F7: 0x40,
+    F8: 0x41,
+    F9: 0x42,
+    F10: 0x43,
+    F11: 0x44,
+    F12: 0x45,
+    PrintScreen: 0x46,
+    ScrollLock: 0x47,
+    Pause: 0x48,
+    Insert: 0x49,
+    Home: 0x4a,
+    PageUp: 0x4b,
+    Delete: 0x4c,
+    End: 0x4d,
+    PageDown: 0x4e,
+    ArrowRight: 0x4f,
+    ArrowLeft: 0x50,
+    ArrowDown: 0x51,
+    ArrowUp: 0x52,
+    NumLock: 0x53,
+    NumpadDivide: 0x54,
+    NumpadMultiply: 0x55,
+    NumpadSubtract: 0x56,
+    NumpadAdd: 0x57,
+    NumpadEnter: 0x58,
+    Numpad1: 0x59,
+    Numpad2: 0x5a,
+    Numpad3: 0x5b,
+    Numpad4: 0x5c,
+    Numpad5: 0x5d,
+    Numpad6: 0x5e,
+    Numpad7: 0x5f,
+    Numpad8: 0x60,
+    Numpad9: 0x61,
+    Numpad0: 0x62,
+    NumpadDecimal: 0x63,
+    ControlLeft: 0xe0,
+    ShiftLeft: 0xe1,
+    AltLeft: 0xe2,
+    MetaLeft: 0xe3,
+    ControlRight: 0xe4,
+    ShiftRight: 0xe5,
+    AltRight: 0xe6,
+    MetaRight: 0xe7,
+  }),
+);
+
+export const SCANCODE_TO_KEYCODE = new Map<number, string>(
+  KEYCODE_TO_SCANCODE.entries().map(([key, value]) => [value!, key]),
+);

src/lib/ccos/ccos.ts

@@ -0,0 +1,210 @@
+import { getMeta } from "$lib/meta/meta-storage";
+import { connectable, from, multicast, Subject } from "rxjs";
+import type {
+  CCOSInitEvent,
+  CCOSKeyPressEvent,
+  CCOSKeyReleaseEvent,
+  CCOSOutEvent,
+} from "./ccos-events";
+import { KEYCODE_TO_SCANCODE, SCANCODE_TO_KEYCODE } from "./ccos-interop";
+
+const device = ".zero_wasm";
+
+class CCOSKeyboardEvent extends KeyboardEvent {
+  constructor(...params: ConstructorParameters<typeof KeyboardEvent>) {
+    super(...params);
+  }
+}
+
+const MASK_CTRL = 0b0001_0001;
+const MASK_SHIFT = 0b0010_0010;
+const MASK_ALT = 0b0100_0100;
+const MASK_ALT_GRAPH = 0b0000_0100;
+const MASK_GUI = 0b1000_1000;
+
+export class CCOS {
+  private readonly currKeys = new Set<number>();
+
+  private readonly layout = new Map<string, string>();
+
+  private readonly worker = new Worker("/ccos-worker.js", { type: "module" });
+
+  private ready = false;
+
+  private lastEvent?: KeyboardEvent;
+
+  private onKey(
+    type: ConstructorParameters<typeof KeyboardEvent>[0],
+    modifiers: number,
+    scanCode: number,
+  ) {
+    if (!this.lastEvent) {
+      return;
+    }
+
+    const code = SCANCODE_TO_KEYCODE.get(scanCode);
+    if (code === undefined) {
+      return;
+    }
+
+    const layoutKey = [code];
+    if (modifiers & MASK_SHIFT) {
+      layoutKey.push("Shift");
+    }
+    if (modifiers & MASK_ALT_GRAPH) {
+      layoutKey.push("AltGraph");
+    }
+    const key = this.layout.get(JSON.stringify(layoutKey)) ?? code;
+
+    const params: Required<KeyboardEventInit> = {
+      bubbles: true,
+      cancelable: true,
+      location: this.lastEvent.location,
+      repeat: this.lastEvent.repeat,
+      detail: this.lastEvent.detail,
+      view: this.lastEvent.view,
+      isComposing: this.lastEvent.isComposing,
+      which: this.lastEvent.which,
+      composed: this.lastEvent.composed,
+      key,
+      code,
+      charCode: key.charCodeAt(0),
+      keyCode: this.lastEvent.keyCode,
+      shiftKey: (modifiers & MASK_SHIFT) !== 0,
+      ctrlKey: (modifiers & MASK_CTRL) !== 0,
+      metaKey: (modifiers & MASK_GUI) !== 0,
+      altKey: (modifiers & MASK_ALT) !== 0,
+      modifierAltGraph: (modifiers & MASK_ALT_GRAPH) !== 0,
+      modifierCapsLock: this.lastEvent.getModifierState("CapsLock"),
+      modifierFn: this.lastEvent.getModifierState("Fn"),
+      modifierFnLock: this.lastEvent.getModifierState("FnLock"),
+      modifierHyper: this.lastEvent.getModifierState("Hyper"),
+      modifierNumLock: this.lastEvent.getModifierState("NumLock"),
+      modifierSuper: (modifiers & MASK_GUI) !== 0,
+      modifierSymbol: this.lastEvent.getModifierState("Symbol"),
+      modifierSymbolLock: this.lastEvent.getModifierState("SymbolLock"),
+      modifierScrollLock: this.lastEvent.getModifierState("ScrollLock"),
+    };
+
+    this.lastEvent.target?.dispatchEvent(new CCOSKeyboardEvent(type, params));
+  }
+
+  private onReport(modifiers: number, keys: number[]) {
+    const nextKeys = new Set<number>(keys);
+    nextKeys.delete(0);
+    for (const key of this.currKeys) {
+      if (!nextKeys.has(key)) {
+        this.onKey("keyup", modifiers, key);
+      }
+    }
+    for (const key of nextKeys) {
+      if (!this.currKeys.has(key)) {
+        this.onKey("keydown", modifiers, key);
+      }
+    }
+    this.currKeys.clear();
+    for (const key of keys) {
+      this.currKeys.add(key);
+    }
+    this.currKeys.delete(0);
+  }
+
+  private outStream = new Subject<number>();
+
+  private readonly buffer: number[] = [];
+  private readonly outStream = new WritableStream<number>({
+    start(controller) {},
+  });
+
+  readonly readable = connectable()
+  readonly writable = new WritableStream<string>();
+
+  constructor(url: string) {
+    this.worker.addEventListener(
+      "message",
+      (event: MessageEvent<CCOSOutEvent>) => {
+        switch (event.data.type) {
+          case "ready": {
+            this.ready = true;
+            break;
+          }
+          case "report": {
+            this.onReport(event.data.modifiers, event.data.keys);
+            break;
+          }
+          case "serial": {
+            this.outStream.next(event.data.data);
+            break;
+          }
+        }
+      },
+    );
+    (navigator as any).keyboard
+      ?.getLayoutMap()
+      ?.then((it: Map<string, string>) =>
+        it.entries().forEach(([key, value]) => {
+          this.layout.set(JSON.stringify([key]), value);
+        }),
+      );
+    this.worker.postMessage({
+      type: "init",
+      url,
+    } satisfies CCOSInitEvent);
+  }
+
+  async destroy() {
+    this.worker.terminate();
+  }
+
+  async handleKeyEvent(event: KeyboardEvent) {
+    if (
+      event.target instanceof HTMLInputElement ||
+      event.target instanceof HTMLTextAreaElement
+    ) {
+      console.error("CCOS does not support input elements");
+      return;
+    }
+
+    if (!this.ready || event instanceof CCOSKeyboardEvent) {
+      return;
+    }
+    event.stopImmediatePropagation();
+    event.preventDefault();
+    this.lastEvent = event;
+
+    const layoutKey = [event.code];
+    if (event.getModifierState("Shift")) {
+      layoutKey.push("Shift");
+    }
+    if (event.getModifierState("AltGraph")) {
+      layoutKey.push("AltGraph");
+    }
+    this.layout.set(JSON.stringify(layoutKey), event.key);
+
+    const scanCode = KEYCODE_TO_SCANCODE.get(event.code);
+    if (scanCode === undefined) return;
+    if (event.type === "keydown") {
+      this.worker.postMessage({
+        type: "press",
+        code: scanCode,
+      } satisfies CCOSKeyPressEvent);
+    } else {
+      this.worker.postMessage({
+        type: "release",
+        code: scanCode,
+      } satisfies CCOSKeyReleaseEvent);
+    }
+  }
+}
+
+export async function fetchCCOS(
+  version = ".test",
+  fetch: typeof window.fetch = window.fetch,
+): Promise<CCOS | undefined> {
+  const meta = await getMeta(device, version, fetch);
+  if (!meta?.update.js || !meta?.update.wasm) {
+    return undefined;
+  }
+
+  return new CCOS(`${meta.path}/${meta.update.js}`);
+}

src/lib/components/layout/Layout.svelte

@@ -32,6 +32,10 @@
       import("$lib/assets/layouts/m4gr.yml").then(
         (it) => it.default as VisualLayout,
       ),
+    T4G: () =>
+      import("$lib/assets/layouts/t4g.yml").then(
+        (it) => it.default as VisualLayout,
+      ),
   };
 </script>
 

src/lib/serial/device.ts

@@ -29,6 +29,7 @@ const KEY_COUNTS = {
   X: 256,
   M4G: 90,
   M4GR: 90,
+  T4G: 7,
 } as const;
 
 if (