3 files changed, 227 insertions, 0 deletions
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
diff --git a/machine-repl.lua b/machine-repl.lua
new file mode 100755
index 0000000..6193095
--- /dev/null
+++ b/machine-repl.lua
@@ -0,0 +1,82 @@
+#!/usr/bin/env -Slua -i
+local cip = require "automaton"
+local x = "abcdefghijklm opqrstuvxyz"
+local state = cip(x)
+local history = {}
+local format = require "format"
+
+
+local function log (value)
+	table.insert(history, {previous=state, value=value})
+end
+
+
+function back ()
+	local entry = table.remove(history)
+	if not entry then
+		io.stderr:write("already at the earliest revision\n")
+		return
+	end
+	state = entry.previous
+	return state
+end
+
+
+function init (data)
+	if data then
+		x = data
+	end
+	state = cip(x)
+	history = {}
+	return state
+end
+
+
+function show ()
+	print(state)
+end
+
+
+function c ()
+	log(0)
+	state = state:pivot()
+	return state
+end
+
+
+function up ()
+	log(1)
+	state = state:up()
+	return state
+end
+
+
+function down ()
+	log(3)
+	state = state:down()
+	return state
+end
+
+
+function left ()
+	log(4)
+	state = state:left()
+	return state
+end
+
+
+function right ()
+	log(2)
+	state = state:right()
+	return state
+end
+
+
+function flush ()
+	local values = {}
+	for _, v in ipairs(history) do
+		table.insert(values, v)
+	end
+	io.write("{", format.csv(values), "}\n")
+	history = {}
+end
diff --git a/machine.lua b/machine.lua
new file mode 100755
index 0000000..44f7146
--- /dev/null
+++ b/machine.lua
@@ -0,0 +1,16 @@
+#!/usr/bin/env lua
+local eyes = require "eyes"
+local reading = require "reading"
+for _, message in ipairs(eyes) do
+	local cip = require"automaton""abcdefghijklm opqrstuvxyz"
+	local str = ""
+	for index, a, b, c in reading.trigrams(message) do
+		cip = cip:apply(a):apply(b):apply(c)
+		local slot = 3
+		if (index - 1) % 3 == 1 then
+			slot = 19
+		end
+		str = str .. cip[slot]
+	end
+	print(str)
+end