diff --git a/Class.lua b/lips/Class.lua
similarity index 100%
rename from Class.lua
rename to lips/Class.lua
diff --git a/Dumper.lua b/lips/Dumper.lua
similarity index 99%
rename from Dumper.lua
rename to lips/Dumper.lua
index e2f52d1..faacf02 100644
--- a/Dumper.lua
+++ b/lips/Dumper.lua
@@ -1,13 +1,13 @@
 local insert = table.insert
 local floor = math.floor
 
-local data = require "data"
+local data = require "lips.data"
 
 local function bitrange(x, lower, upper)
     return floor(x/2^lower) % 2^(upper - lower + 1)
 end
 
-local Dumper = require("Class")()
+local Dumper = require("lips.Class")()
 function Dumper:init(writer, fn, options)
     self.writer = writer
     self.fn = fn or '(string)'
diff --git a/Lexer.lua b/lips/Lexer.lua
similarity index 96%
rename from Lexer.lua
rename to lips/Lexer.lua
index fa81190..922f454 100644
--- a/Lexer.lua
+++ b/lips/Lexer.lua
@@ -1,10 +1,21 @@
 local byte = string.byte
 local char = string.char
 local find = string.find
+local open = io.open
 
-local data = require "data"
+local data = require "lips.data"
 
-local Lexer = require("Class")()
+local function readfile(fn)
+    local f = open(fn, 'r')
+    if not f then
+        error('could not open assembly file for reading: '..tostring(fn), 2)
+    end
+    local asm = f:read('*a')
+    f:close()
+    return asm
+end
+
+local Lexer = require("lips.Class")()
 function Lexer:init(asm, fn, options)
     self.asm = asm
     self.fn = fn or '(string)'
diff --git a/Parser.lua b/lips/Parser.lua
similarity index 98%
rename from Parser.lua
rename to lips/Parser.lua
index 01d662a..f3e9bc3 100644
--- a/Parser.lua
+++ b/lips/Parser.lua
@@ -1,12 +1,12 @@
 local insert = table.insert
 local format = string.format
 
-local data = require "data"
-local overrides = require "overrides"
-local Dumper = require "Dumper"
-local Lexer = require "Lexer"
+local data = require "lips.data"
+local overrides = require "lips.overrides"
+local Dumper = require "lips.Dumper"
+local Lexer = require "lips.Lexer"
 
-local Parser = require("Class")()
+local Parser = require("lips.Class")()
 function Parser:init(writer, fn, options)
     self.fn = fn or '(string)'
     self.main_fn = self.fn
diff --git a/data.lua b/lips/data.lua
similarity index 100%
rename from data.lua
rename to lips/data.lua
diff --git a/lips.lua b/lips/init.lua
similarity index 97%
rename from lips.lua
rename to lips/init.lua
index 8f2d53e..d3dfac7 100644
--- a/lips.lua
+++ b/lips/init.lua
@@ -12,7 +12,9 @@ local assembler = {
     ]],
 }
 
-local Parser = require "Parser"
+local open = io.open
+
+local Parser = require "lips.Parser"
 
 local function readfile(fn)
     local f = open(fn, 'r')
diff --git a/overrides.lua b/lips/overrides.lua
similarity index 99%
rename from overrides.lua
rename to lips/overrides.lua
index c06bad1..dfbce6e 100644
--- a/overrides.lua
+++ b/lips/overrides.lua
@@ -1,4 +1,6 @@
-local data = require "data"
+local insert = table.insert
+
+local data = require "lips.data"
 local instructions = data.instructions
 
 local overrides = {}