diff --git a/lips/Collector.lua b/lips/Collector.lua
index 1fb0724..9db3f7b 100644
--- a/lips/Collector.lua
+++ b/lips/Collector.lua
@@ -208,7 +208,6 @@ function Collector:collect(tokens, fn)
     end
 
     for t in I do
-        print(t.tt, t.tok)
         if t.tt == 'EOF' then
             -- noop
         elseif t.tt == 'EOL' then
diff --git a/lips/Parser.lua b/lips/Parser.lua
index 66d2766..353100f 100644
--- a/lips/Parser.lua
+++ b/lips/Parser.lua
@@ -37,53 +37,29 @@ function Parser:tokenize(asm)
     assert(#tokens > 0, 'Internal Error: no tokens after preprocessing')
 
     local collector = Collector(self.options)
-    self.statements = collector:collect(tokens, self.main_fn)
+    return collector:collect(tokens, self.main_fn)
 end
 
-function Parser:debug_dump()
-    local boring = {
-        tt = true,
-        tok = true,
-        fn = true,
-        line = true,
-    }
+function Parser:dump()
     for i, s in ipairs(self.statements) do
-        local values = ''
-        for j, t in ipairs(s) do
-            local tok = t.tok
-            if type(tok) == 'number' then
-                tok = ("$%X"):format(tok)
-            end
-            values = values..'\t'..t.tt..'('..tostring(tok)..')'
-            for k, v in pairs(t) do
-                if not boring[k] then
-                    values = values..'['..k..'='..tostring(v)..']'
-                end
-            end
-        end
-        values = values:sub(2)
-        print(s.line, s.type, values)
+        print(s.line, s.type, s:dump())
     end
 end
 
 function Parser:parse(asm)
-    self:tokenize(asm)
-
-    if self.options.debug_token then self:debug_dump() end
+    self.statements = self:tokenize(asm)
+    if self.options.debug_token then self:dump() end
 
     local preproc = Preproc(self.options)
     self.statements = preproc:process(self.statements)
-
-    if self.options.debug_pre then self:debug_dump() end
+    if self.options.debug_pre then self:dump() end
 
     self.statements = preproc:expand(self.statements)
-
-    if self.options.debug_post then self:debug_dump() end
+    if self.options.debug_post then self:dump() end
 
     local dumper = Dumper(self.writer, self.options)
     self.statements = dumper:load(self.statements)
-
-    if self.options.debug_asm then self:debug_dump() end
+    if self.options.debug_asm then self:dump() end
 
     if self.options.labels then
         dumper:export_labels(self.options.labels)
diff --git a/lips/Preproc.lua b/lips/Preproc.lua
index 3f5dd96..d5def64 100644
--- a/lips/Preproc.lua
+++ b/lips/Preproc.lua
@@ -1,3 +1,4 @@
+local abs = math.abs
 local insert = table.insert
 
 local path = string.gsub(..., "[^.]+$", "")
@@ -6,20 +7,9 @@ local overrides = require(path.."overrides")
 local Statement = require(path.."Statement")
 local Reader = require(path.."Reader")
 local Expression = require(path.."Expression")
+local util = require(path.."util")
 
-local abs = math.abs
-
-local function signs(s)
-    local start, end_ = s:find('[+-]+')
-    if start ~= 1 then
-        return 0
-    end
-    if s:sub(1, 1) == '+' then
-        return end_
-    elseif s:sub(1, 1) == '-' then
-        return -end_
-    end
-end
+local signs = util.signs
 
 local Preproc = Reader:extend()
 function Preproc:init(options)
diff --git a/lips/Statement.lua b/lips/Statement.lua
index 384d17a..e9cb4ea 100644
--- a/lips/Statement.lua
+++ b/lips/Statement.lua
@@ -50,4 +50,28 @@ function Statement:validate(n)
     end
 end
 
+local boring = {
+    tt = true,
+    tok = true,
+    fn = true,
+    line = true,
+}
+
+function Statement:dump()
+    local values = ''
+    for j, t in ipairs(self) do
+        local tok = t.tok
+        if type(tok) == 'number' then
+            tok = ("$%X"):format(tok)
+        end
+        values = values..'\t'..t.tt..'('..tostring(tok)..')'
+        for k, v in pairs(t) do
+            if not boring[k] then
+                values = values..'['..k..'='..tostring(v)..']'
+            end
+        end
+    end
+    return values:sub(2)
+end
+
 return Statement
diff --git a/lips/util.lua b/lips/util.lua
index 145ecca..9006399 100644
--- a/lips/util.lua
+++ b/lips/util.lua
@@ -14,7 +14,7 @@ local function readfile(fn, binary)
 end
 
 local function bitrange(x, lower, upper)
-    return floor(x/2^lower) % 2^(upper - lower + 1)
+    return floor(x / 2^lower) % 2^(upper - lower + 1)
 end
 
 local function parent(t)
@@ -25,6 +25,18 @@ local function parent(t)
     return mt.__index
 end
 
+local function signs(s)
+    local start, end_ = s:find('[+-]+')
+    if start ~= 1 then
+        return 0
+    end
+    if s:sub(1, 1) == '+' then
+        return end_
+    elseif s:sub(1, 1) == '-' then
+        return -end_
+    end
+end
+
 -- http://stackoverflow.com/a/9279009
 local loadcode
 if setfenv and loadstring then -- 5.1, JIT
@@ -77,6 +89,7 @@ return {
     readfile = readfile,
     bitrange = bitrange,
     parent = parent,
+    signs = signs,
     loadcode = loadcode,
     measure_data = measure_data,
 }