First bundled release.

tetris/randomizers/history_6rolls_35bag.lua

@@ -0,0 +1,47 @@
+local Randomizer = require 'tetris.randomizers.randomizer'
+
+local History6RollsRandomizer = Randomizer:extend()
+
+function History6RollsRandomizer:initialize()
+	self.history = {"Z", "S", "Z", "S"}
+	self.bag_counts = {
+		I = 5, J = 5, L = 5, O = 5, S = 3, T = 5, Z = 3
+	}
+end
+
+function History6RollsRandomizer:getBagPiece(n)
+	for shape, count in pairs(self.bag_counts) do
+		n = n - count
+		if n <= 0 then
+			return shape
+		end
+	end
+end
+
+function History6RollsRandomizer:generatePiece()
+	for i = 1, 6 do
+		local x = self:getBagPiece(math.random(31))
+		if not inHistory(x, self.history) or i == 6 then
+			return self:updateHistory(x)
+		end
+	end
+end
+
+function History6RollsRandomizer:updateHistory(shape)
+	self.bag_counts[shape] = self.bag_counts[shape] - 1
+	local replaced_piece = table.remove(self.history, 1)
+	table.insert(self.history, shape)
+	self.bag_counts[replaced_piece] = self.bag_counts[replaced_piece] + 1
+	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 History6RollsRandomizer