1 files changed, 0 insertions, 280 deletions
diff --git a/js/timers.ts b/js/timers.ts
deleted file mode 100644
index 5bc4922e3..000000000
--- a/js/timers.ts
+++ /dev/null
@@ -1,280 +0,0 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { assert } from "./util.ts";
-import { window } from "./window.ts";
-import * as dispatch from "./dispatch.ts";
-import { sendSync, sendAsync } from "./dispatch_json.ts";
-
-const { console } = window;
-
-interface Timer {
-  id: number;
-  callback: () => void;
-  delay: number;
-  due: number;
-  repeat: boolean;
-  scheduled: boolean;
-}
-
-// We'll subtract EPOCH every time we retrieve the time with Date.now(). This
-// ensures that absolute time values stay below UINT32_MAX - 2, which is the
-// maximum object key that EcmaScript considers "numerical". After running for
-// about a month, this is no longer true, and Deno explodes.
-// TODO(piscisaureus): fix that ^.
-const EPOCH = Date.now();
-const APOCALYPSE = 2 ** 32 - 2;
-
-// Timeout values > TIMEOUT_MAX are set to 1.
-const TIMEOUT_MAX = 2 ** 31 - 1;
-
-let globalTimeoutDue: number | null = null;
-
-let nextTimerId = 1;
-const idMap = new Map<number, Timer>();
-const dueMap: { [due: number]: Timer[] } = Object.create(null);
-
-function getTime(): number {
-  // TODO: use a monotonic clock.
-  const now = Date.now() - EPOCH;
-  assert(now >= 0 && now < APOCALYPSE);
-  return now;
-}
-
-function clearGlobalTimeout(): void {
-  globalTimeoutDue = null;
-  sendSync(dispatch.OP_GLOBAL_TIMER_STOP);
-}
-
-async function setGlobalTimeout(due: number, now: number): Promise<void> {
-  // Since JS and Rust don't use the same clock, pass the time to rust as a
-  // relative time value. On the Rust side we'll turn that into an absolute
-  // value again.
-  const timeout = due - now;
-  assert(timeout >= 0);
-
-  // Send message to the backend.
-  globalTimeoutDue = due;
-  await sendAsync(dispatch.OP_GLOBAL_TIMER, { timeout });
-  // eslint-disable-next-line @typescript-eslint/no-use-before-define
-  fireTimers();
-}
-
-function setOrClearGlobalTimeout(due: number | null, now: number): void {
-  if (due == null) {
-    clearGlobalTimeout();
-  } else {
-    setGlobalTimeout(due, now);
-  }
-}
-
-function schedule(timer: Timer, now: number): void {
-  assert(!timer.scheduled);
-  assert(now <= timer.due);
-  // Find or create the list of timers that will fire at point-in-time `due`.
-  let list = dueMap[timer.due];
-  if (list === undefined) {
-    list = dueMap[timer.due] = [];
-  }
-  // Append the newly scheduled timer to the list and mark it as scheduled.
-  list.push(timer);
-  timer.scheduled = true;
-  // If the new timer is scheduled to fire before any timer that existed before,
-  // update the global timeout to reflect this.
-  if (globalTimeoutDue === null || globalTimeoutDue > timer.due) {
-    setOrClearGlobalTimeout(timer.due, now);
-  }
-}
-
-function unschedule(timer: Timer): void {
-  if (!timer.scheduled) {
-    return;
-  }
-  // Find the list of timers that will fire at point-in-time `due`.
-  const list = dueMap[timer.due];
-  if (list.length === 1) {
-    // Time timer is the only one in the list. Remove the entire list.
-    assert(list[0] === timer);
-    delete dueMap[timer.due];
-    // If the unscheduled timer was 'next up', find when the next timer that
-    // still exists is due, and update the global alarm accordingly.
-    if (timer.due === globalTimeoutDue) {
-      let nextTimerDue: number | null = null;
-      for (const key in dueMap) {
-        nextTimerDue = Number(key);
-        break;
-      }
-      setOrClearGlobalTimeout(nextTimerDue, getTime());
-    }
-  } else {
-    // Multiple timers that are due at the same point in time.
-    // Remove this timer from the list.
-    const index = list.indexOf(timer);
-    assert(index > -1);
-    list.splice(index, 1);
-  }
-}
-
-function fire(timer: Timer): void {
-  // If the timer isn't found in the ID map, that means it has been cancelled
-  // between the timer firing and the promise callback (this function).
-  if (!idMap.has(timer.id)) {
-    return;
-  }
-  // Reschedule the timer if it is a repeating one, otherwise drop it.
-  if (!timer.repeat) {
-    // One-shot timer: remove the timer from this id-to-timer map.
-    idMap.delete(timer.id);
-  } else {
-    // Interval timer: compute when timer was supposed to fire next.
-    // However make sure to never schedule the next interval in the past.
-    const now = getTime();
-    timer.due = Math.max(now, timer.due + timer.delay);
-    schedule(timer, now);
-  }
-  // Call the user callback. Intermediate assignment is to avoid leaking `this`
-  // to it, while also keeping the stack trace neat when it shows up in there.
-  const callback = timer.callback;
-  callback();
-}
-
-function fireTimers(): void {
-  const now = getTime();
-  // Bail out if we're not expecting the global timer to fire.
-  if (globalTimeoutDue === null) {
-    return;
-  }
-  // After firing the timers that are due now, this will hold the due time of
-  // the first timer that hasn't fired yet.
-  let nextTimerDue: number | null = null;
-  // Walk over the keys of the 'due' map. Since dueMap is actually a regular
-  // object and its keys are numerical and smaller than UINT32_MAX - 2,
-  // keys are iterated in ascending order.
-  for (const key in dueMap) {
-    // Convert the object key (a string) to a number.
-    const due = Number(key);
-    // Break out of the loop if the next timer isn't due to fire yet.
-    if (Number(due) > now) {
-      nextTimerDue = due;
-      break;
-    }
-    // Get the list of timers that have this due time, then drop it.
-    const list = dueMap[key];
-    delete dueMap[key];
-    // Fire all the timers in the list.
-    for (const timer of list) {
-      // With the list dropped, the timer is no longer scheduled.
-      timer.scheduled = false;
-      // Place the callback on the microtask queue.
-      Promise.resolve(timer).then(fire);
-    }
-  }
-
-  // Update the global alarm to go off when the first-up timer that hasn't fired
-  // yet is due.
-  setOrClearGlobalTimeout(nextTimerDue, now);
-}
-
-export type Args = unknown[];
-
-function checkThis(thisArg: unknown): void {
-  if (thisArg !== null && thisArg !== undefined && thisArg !== window) {
-    throw new TypeError("Illegal invocation");
-  }
-}
-
-function checkBigInt(n: unknown): void {
-  if (typeof n === "bigint") {
-    throw new TypeError("Cannot convert a BigInt value to a number");
-  }
-}
-
-function setTimer(
-  cb: (...args: Args) => void,
-  delay: number,
-  args: Args,
-  repeat: boolean
-): number {
-  // Bind `args` to the callback and bind `this` to window(global).
-  const callback: () => void = cb.bind(window, ...args);
-  // In the browser, the delay value must be coercible to an integer between 0
-  // and INT32_MAX. Any other value will cause the timer to fire immediately.
-  // We emulate this behavior.
-  const now = getTime();
-  if (delay > TIMEOUT_MAX) {
-    console.warn(
-      `${delay} does not fit into` +
-        " a 32-bit signed integer." +
-        "\nTimeout duration was set to 1."
-    );
-    delay = 1;
-  }
-  delay = Math.max(0, delay | 0);
-
-  // Create a new, unscheduled timer object.
-  const timer = {
-    id: nextTimerId++,
-    callback,
-    args,
-    delay,
-    due: now + delay,
-    repeat,
-    scheduled: false
-  };
-  // Register the timer's existence in the id-to-timer map.
-  idMap.set(timer.id, timer);
-  // Schedule the timer in the due table.
-  schedule(timer, now);
-  return timer.id;
-}
-
-/** Sets a timer which executes a function once after the timer expires. */
-export function setTimeout(
-  cb: (...args: Args) => void,
-  delay = 0,
-  ...args: Args
-): number {
-  checkBigInt(delay);
-  // @ts-ignore
-  checkThis(this);
-  return setTimer(cb, delay, args, false);
-}
-
-/** Repeatedly calls a function , with a fixed time delay between each call. */
-export function setInterval(
-  cb: (...args: Args) => void,
-  delay = 0,
-  ...args: Args
-): number {
-  checkBigInt(delay);
-  // @ts-ignore
-  checkThis(this);
-  return setTimer(cb, delay, args, true);
-}
-
-/** Clears a previously set timer by id. AKA clearTimeout and clearInterval. */
-function clearTimer(id: number): void {
-  id = Number(id);
-  const timer = idMap.get(id);
-  if (timer === undefined) {
-    // Timer doesn't exist any more or never existed. This is not an error.
-    return;
-  }
-  // Unschedule the timer if it is currently scheduled, and forget about it.
-  unschedule(timer);
-  idMap.delete(timer.id);
-}
-
-export function clearTimeout(id = 0): void {
-  checkBigInt(id);
-  if (id === 0) {
-    return;
-  }
-  clearTimer(id);
-}
-
-export function clearInterval(id = 0): void {
-  checkBigInt(id);
-  if (id === 0) {
-    return;
-  }
-  clearTimer(id);
-}