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lua/sam/libs/sh_promises.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+if SAM_LOADED then return end
+-- not real promises, just really simple one
+
+local isfunction = sam and sam.isfunction or isfunction
+
+local null = {}
+
+local Promise = {}
+
+local PromiseMethods = {}
+local Promise_meta = {__index = PromiseMethods}
+
+function Promise.new()
+	return setmetatable({
+		value = null,
+		null = null
+	}, Promise_meta)
+end
+
+function Promise.IsPromise(v)
+	return getmetatable(v) == Promise_meta
+end
+
+function PromiseMethods:resolve(v)
+	if self.value ~= null then return end
+	if self.done_callback then
+		self.done_callback(v)
+	else
+		self.value = v
+		self.callback = 0
+	end
+end
+
+function PromiseMethods:reject(v)
+	if self.value ~= null then return end
+	if self.catch_callback then
+		self.catch_callback(v)
+	else
+		self.value = v
+		self.callback = 1
+	end
+end
+
+function PromiseMethods:done(func)
+	if isfunction(func) then
+		if self.value ~= null and self.callback == 0 then
+			func(self.value)
+		else
+			self.done_callback = func
+		end
+	end
+	return self
+end
+
+function PromiseMethods:catch(func)
+	if isfunction(func) then
+		if self.value ~= null and self.callback == 1 then
+			func(self.value)
+		else
+			self.catch_callback = func
+		end
+	end
+	return self
+end
+
+return Promise