1 files changed, 100 insertions, 0 deletions
diff --git a/script-beta/await.lua b/script-beta/await.lua
new file mode 100644
index 00000000..5a960e96
--- /dev/null
+++ b/script-beta/await.lua
@@ -0,0 +1,100 @@
+local timer  = require 'timer'
+
+---@class await
+local m = {}
+m.type = 'await'
+
+m.coTracker = setmetatable({}, { __mode = 'k' })
+m.delayQueue = {}
+m.delayQueueIndex = 1
+
+--- 设置错误处理器
+---@param errHandle function {comment = '当有错误发生时，会以错误堆栈为参数调用该函数'}
+function m.setErrorHandle(errHandle)
+    m.errorHandle = errHandle
+end
+
+function m.checkResult(co, ...)
+    local suc, err = ...
+    if not suc and m.errorHandle then
+        m.errorHandle(debug.traceback(co, err))
+    end
+    return ...
+end
+
+--- 创建一个任务
+function m.create(callback, ...)
+    local co = coroutine.create(callback)
+    m.coTracker[co] = true
+    return m.checkResult(co, coroutine.resume(co, ...))
+end
+
+--- 休眠一段时间
+---@param time number
+function m.sleep(time, getVersion)
+    if not coroutine.isyieldable() then
+        if m.errorHandle then
+            m.errorHandle(debug.traceback('Cannot yield'))
+        end
+        return
+    end
+    local version = getVersion and getVersion()
+    local co = coroutine.running()
+    timer.wait(time, function ()
+        if version == (getVersion and getVersion()) then
+            return m.checkResult(co, coroutine.resume(co))
+        else
+            coroutine.close(co)
+        end
+    end)
+    return coroutine.yield(getVersion)
+end
+
+--- 等待直到唤醒
+---@param callback function
+function m.wait(callback, ...)
+    if not coroutine.isyieldable() then
+        return
+    end
+    local co = coroutine.running()
+    callback(function (...)
+        return m.checkResult(co, coroutine.resume(co, ...))
+    end)
+    return coroutine.yield(...)
+end
+
+--- 延迟
+function m.delay(getVersion)
+    if not coroutine.isyieldable() then
+        return
+    end
+    local co = coroutine.running()
+    local version = getVersion and getVersion()
+    m.delayQueue[#m.delayQueue+1] = function ()
+        if version == (getVersion and getVersion()) then
+            return m.checkResult(co, coroutine.resume(co))
+        else
+            coroutine.close(co)
+        end
+    end
+    return coroutine.yield()
+end
+
+--- 步进
+function m.step()
+    local waker = m.delayQueue[m.delayQueueIndex]
+    if waker then
+        m.delayQueue[m.delayQueueIndex] = false
+        m.delayQueueIndex = m.delayQueueIndex + 1
+        waker()
+        return true
+    else
+        for i = 1, #m.delayQueue do
+            m.delayQueue[i] = nil
+        end
+        m.delayQueueIndex = 1
+        return false
+    end
+end
+
+return m