set up as a proper module; fix some stuff

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)'

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)'

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

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')

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 = {}