mirror of
https://github.com/CompeyDev/rusty-luau.git
synced 2024-12-13 05:20:41 +00:00
99 lines
2.3 KiB
Lua
99 lines
2.3 KiB
Lua
local task = require("@lune/task")
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local mod = require("../mod")
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local Signal = mod.signal
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type Signal<T...> = mod.Signal<T...>
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local result = require("result")
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export type Result<T, E> = result.Result<T, E>
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local Ok = result.Ok
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local Err = result.Err
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local Future = {}
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export type Status = "initialized" | "running" | "cancelled" | "done"
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export type Future<T> = typeof(Future) & {
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_fn: (set: (value: T) -> ()) -> T,
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_ret: T,
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_thread: thread,
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_spawnEvt: Signal<()>,
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_retEvt: Signal<T | Result<T, string>, Status>,
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_status: Status,
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}
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local function _constructor<T>(fn: (Signal<()>, Signal<T, Status>) -> (), args: { any })
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return setmetatable(
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{
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_thread = coroutine.create(fn),
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_spawnEvt = Signal.new(),
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_retEvt = Signal.new(),
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_status = "initialized",
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} :: Future<T>,
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{
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__index = Future,
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}
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)
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end
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function Future.new<T>(fn: (...any) -> T, args: { any })
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return _constructor(function(spawnEvt: Signal<()>, retEvt: Signal<T, Status>)
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spawnEvt:Fire()
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local ret = fn(table.unpack(args))
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retEvt:Fire(ret, "done")
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end, args)
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end
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function Future.try<T>(fn: (...any) -> T, args: { any })
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return _constructor(function(spawnEvt: Signal<()>, retEvt: Signal<Result<T, string>, Status>)
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spawnEvt:Fire()
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local ok, ret = pcall(fn, table.unpack(args))
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local result: Result<T, string> = if ok then Ok(ret) else Err(ret)
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retEvt:Fire(result, "done")
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end, args)
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end
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function Future.poll<T>(self: Future<T>): (Status, T)
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if self._status == "initialized" then
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self._retEvt:Connect(function(firedRet, status: Status)
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self._status = status
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self._ret = firedRet
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-- Cleanup
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coroutine.yield(self._thread)
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coroutine.close(self._thread)
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self._spawnEvt:DisconnectAll()
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self._retEvt:DisconnectAll()
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end)
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self._spawnEvt:Connect(function()
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self._status = "running"
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end)
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coroutine.resume(self._thread, self._spawnEvt, self._retEvt)
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end
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if self._status == "running" then
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-- Just wait a bit more for the signal to fire
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task.wait(0.01)
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end
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return self._status, self._ret
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end
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function Future.cancel<T>(self: Future<T>)
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self._retEvt:Fire(nil :: any, "cancelled")
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self._status = "cancelled"
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end
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function Future.await<T>(self: Future<T>): T
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while true do
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local status: Status, ret: T = self:poll()
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if status == "done" then
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return ret
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end
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end
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end
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