From 2eee005702d1be7e0391399f203cdbd9d7d5a42a Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Thu, 7 Nov 2024 18:28:16 +0100
Subject: Sketch of Patrick's simplified automaton/cipher mechanism

Document: https://docs.google.com/document/d/1EwnCgP4eq1g_M2iZObSDZdhV3fFoZ0RXRBXWrUm-hw0
Discord: https://discord.com/channels/453998283174576133/1063583558154854521/1303784643342106645
---
 automaton/init.lua | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 automaton/init.lua

(limited to 'automaton/init.lua')

diff --git a/automaton/init.lua b/automaton/init.lua
new file mode 100644
index 0000000..8c4bc40
--- /dev/null
+++ b/automaton/init.lua
@@ -0,0 +1,129 @@
+local actions = {}
+
+
+function actions:clone ()
+	local new = {}
+	for i, v in ipairs(self) do
+		new[i] = v
+	end
+	return setmetatable(new, getmetatable(self))
+end
+
+
+function actions:tostring ()
+	return
+		table.concat(self, nil, 1, 9) .."\n "..
+		table.concat(self, nil, 10, 16) .."\n"..
+		table.concat(self, nil, 17, 25)
+end
+
+
+function actions:pivot ()
+	local new = self:clone()
+	new[10] = self[3]
+	new[3] = self[12]
+	new[12] = self[19]
+	new[19] = self[10]
+	return new
+end
+
+
+function actions:up ()
+	local new = self:clone()
+	for i=1, 9 do
+		new[16 + i] = self[i]
+	end
+	for i=2, 8 do
+		new[i] = self[8 + i]
+		new[8 + i] = self[16 + i]
+	end
+	new[1] = self[17]
+	new[9] = self[25]
+	return new
+end
+
+
+function actions:right ()
+	local new = self:clone()
+	new[1] = self[9]
+	for i=2, 9 do
+		new[i] = self[i - 1]
+	end
+	new[10] = self[16]
+	for i=11, 16 do
+		new[i] = self[i - 1]
+	end
+	new[17] = self[25]
+	for i=18, 25 do
+		new[i] = self[i - 1]
+	end
+	return new
+end
+
+
+function actions:down ()
+	local new = self:clone()
+	for i=1, 9 do
+		new[i] = self[26 - i]
+		new[26 - i] = self[i]
+	end
+	for i=1, 3 do
+		new[9 + i] = self[17 - i]
+		new[17 - i] = self[9 + i]
+	end
+	new[13] = self[13]
+	return new
+end
+
+
+function actions:left ()
+	local new = self:clone()
+	for i=1, 8 do
+		new[i] = self[i + 1]
+	end
+	new[9] = self[1]
+	for i=10, 15 do
+		new[i] = self[i + 1]
+	end
+	new[16] = self[10]
+	for i=17, 24 do
+		new[i] = self[i + 1]
+	end
+	new[25] = self[17]
+	return new
+end
+
+
+local map = {
+	[0] = actions.pivot,
+	[1] = actions.up,
+	[2] = actions.right,
+	[3] = actions.down,
+	[4] = actions.left,
+}
+
+
+function actions:apply (eye)
+	return map[eye](self)
+end
+
+
+local mt = {
+	__index = actions,
+	__tostring = actions.tostring,
+}
+
+
+local function new (data)
+	if type(data) == "string" then
+		local obj = {}
+		for i=1, 25 do
+			obj[i] = data:sub(i, i)
+		end
+		data = obj
+	end
+	return setmetatable(data, mt)
+end
+
+
+return new
-- 
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