First bundled release.

tetris/randomizers/history_4rolls.lua

@@ -0,0 +1,34 @@
+local Randomizer = require 'tetris.randomizers.randomizer'
+
+local History4RollsRandomizer = Randomizer:extend()
+
+function History4RollsRandomizer:initialize()
+	self.history = {"Z", "S", "Z", "S"}
+end
+
+function History4RollsRandomizer:generatePiece()
+	local shapes = {"I", "J", "L", "O", "S", "T", "Z"}
+	for i = 1, 4 do
+		local x = math.random(7)
+		if not inHistory(shapes[x], self.history) or i == 4 then
+			return self:updateHistory(shapes[x])
+		end
+	end
+end
+
+function History4RollsRandomizer:updateHistory(shape)
+	table.remove(self.history, 1)
+	table.insert(self.history, shape)
+	return shape
+end
+
+function inHistory(piece, history)
+	for idx, entry in pairs(history) do
+		if entry == piece then
+			return true
+		end
+	end
+	return false
+end
+
+return History4RollsRandomizer