diff --git a/moonscript/compile.lua b/moonscript/compile.lua
index ff53509..98e0f44 100644
--- a/moonscript/compile.lua
+++ b/moonscript/compile.lua
@@ -18,6 +18,19 @@ do
 end
 local concat, insert = table.concat, table.insert
 local pos_to_line, get_closest_line, trim = util.pos_to_line, util.get_closest_line, util.trim
+local mtype = util.moon.type
+local insert_many
+insert_many = function(tbl, ...)
+  local i = #tbl + 1
+  local _list_0 = {
+    ...
+  }
+  for _index_0 = 1, #_list_0 do
+    local val = _list_0[_index_0]
+    tbl[i] = val
+    i = i + 1
+  end
+end
 local Line
 Line = (function()
   local _parent_0 = nil
@@ -53,19 +66,41 @@ Line = (function()
       return nil
     end,
     render = function(self)
-      local buff = { }
-      for i = 1, #self do
-        local c = self[i]
-        insert(buff, (function()
-          if util.moon.type(c) == Block then
-            c:bubble()
-            return c:render()
-          else
-            return c
-          end
-        end)())
+      local parts = { }
+      local current = { }
+      local add_current
+      add_current = function()
+        return insert(parts, table.concat(current))
       end
-      return concat(buff)
+      local _list_0 = self
+      for _index_0 = 1, #_list_0 do
+        local chunk = _list_0[_index_0]
+        local _exp_0 = mtype(chunk)
+        if Block == _exp_0 then
+          local _list_1 = {
+            chunk:render()
+          }
+          for _index_1 = 1, #_list_1 do
+            local block_chunk = _list_1[_index_1]
+            if "string" == type(block_chunk) then
+              insert(current, block_chunk)
+            else
+              add_current()
+              insert(parts, block_chunk)
+              current = { }
+            end
+          end
+        else
+          insert(current, chunk)
+        end
+      end
+      if #current > 0 then
+        add_current()
+      end
+      return unpack(parts)
+    end,
+    __tostring = function(self)
+      return "Line<" .. tostring(self:render()) .. ">"
     end
   }
   _base_0.__index = _base_0
@@ -103,6 +138,7 @@ Line = (function()
   return _class_0
 end)()
 Block = (function()
+  local flatten
   local _parent_0 = nil
   local _base_0 = {
     header = "do",
@@ -251,8 +287,8 @@ Block = (function()
         end
       end
     end,
-    add_line_text = function(self, text)
-      return insert(self._lines, text)
+    add_raw = function(self, item)
+      return insert(self._lines, item)
     end,
     append_line_table = function(self, sub_table, offset)
       offset = offset + self.current_line
@@ -281,62 +317,48 @@ Block = (function()
       end
     end,
     add = function(self, line)
-      local t = util.moon.type(line)
-      if t == "string" then
-        self:add_line_text(line)
-      elseif t == Block then
-        self:add(self:line(line))
-      elseif t == Line then
-        self:add_line_tables(line)
-        self:add_line_text(line:render())
-        self.current_line = self.current_line + 1
+      local _exp_0 = util.moon.type(line)
+      if "string" == _exp_0 then
+        return insert(self._lines, line)
+      elseif Block == _exp_0 then
+        return insert_many(self._lines, line:render())
+      elseif Line == _exp_0 then
+        return insert_many(self._lines, line:render())
       else
-        error("Adding unknown item")
-      end
-      return nil
-    end,
-    _insert_breaks = function(self)
-      for i = 1, #self._lines - 1 do
-        local left, right = self._lines[i], self._lines[i + 1]
-        local lc = left:sub(-1)
-        if (lc == ")" or lc == "]") and right:sub(1, 1) == "(" then
-          self._lines[i] = self._lines[i] .. ";"
-        end
+        return error("Adding unknown item")
       end
     end,
     render = function(self)
-      local flatten
-      flatten = function(line)
-        if type(line) == "string" then
-          return line
+      local out = {
+        flatten(self.header)
+      }
+      local lines = (function()
+        local _accum_0 = { }
+        local _len_0 = 0
+        local _list_0 = self._lines
+        for _index_0 = 1, #_list_0 do
+          local line = _list_0[_index_0]
+          local _value_0 = flatten(line)
+          if _value_0 ~= nil then
+            _len_0 = _len_0 + 1
+            _accum_0[_len_0] = _value_0
+          end
+        end
+        return _accum_0
+      end)()
+      if self.next then
+        insert(out, lines)
+        insert_many(out, self.next:render())
+      else
+        local footer = flatten(self.footer)
+        if #lines == 0 and #out == 1 then
+          out[1] = out[1] .. (" " .. footer)
         else
-          return line:render()
+          insert(out, lines)
+          insert(out, footer)
         end
       end
-      local header = flatten(self.header)
-      if #self._lines == 0 then
-        local footer = flatten(self.footer)
-        return concat({
-          header,
-          footer
-        }, " ")
-      end
-      local indent = indent_char:rep(self.indent)
-      if not self.delim then
-        self:_insert_breaks()
-      end
-      local body = indent .. concat(self._lines, (self.delim or "") .. "\n" .. indent)
-      return concat({
-        header,
-        body,
-        indent_char:rep(self.indent - 1) .. (function()
-          if self.next then
-            return self.next:render()
-          else
-            return flatten(self.footer)
-          end
-        end)()
-      }, "\n")
+      return unpack(out)
     end,
     block = function(self, header, footer)
       return Block(self, header, footer)
@@ -492,11 +514,50 @@ Block = (function()
     end
   })
   _base_0.__class = _class_0
+  local self = _class_0
+  flatten = function(line)
+    local _exp_0 = mtype(line)
+    if Line == _exp_0 then
+      return line:render()
+    else
+      return line
+    end
+  end
   if _parent_0 and _parent_0.__inherited then
     _parent_0.__inherited(_parent_0, _class_0)
   end
   return _class_0
 end)()
+local flatten_lines
+flatten_lines = function(lines, indent, buffer)
+  if indent == nil then
+    indent = nil
+  end
+  if buffer == nil then
+    buffer = { }
+  end
+  for i = 1, #lines do
+    local l = lines[i]
+    local _exp_0 = type(l)
+    if "string" == _exp_0 then
+      if indent then
+        insert(buffer, indent)
+      end
+      insert(buffer, l)
+      if "string" == type(lines[i + 1]) then
+        local lc = l:sub(-1)
+        if (lc == ")" or lc == "]") and lines[i + 1]:sub(1, 1) == "(" then
+          insert(buffer, ";")
+        end
+      end
+      insert(buffer, "\n")
+      local last = l
+    elseif "table" == _exp_0 then
+      flatten_lines(l, indent and indent .. indent_char or indent_char, buffer)
+    end
+  end
+  return buffer
+end
 RootBlock = (function()
   local _parent_0 = Block
   local _base_0 = {
@@ -504,8 +565,11 @@ RootBlock = (function()
       return "RootBlock<>"
     end,
     render = function(self)
-      self:_insert_breaks()
-      return concat(self._lines, "\n")
+      local buffer = flatten_lines(self._lines)
+      if buffer[#buffer] == "\n" then
+        buffer[#buffer] = nil
+      end
+      return table.concat(buffer)
     end
   }
   _base_0.__index = _base_0
diff --git a/moonscript/compile.moon b/moonscript/compile.moon
index 4b3b070..f5648f4 100644
--- a/moonscript/compile.moon
+++ b/moonscript/compile.moon
@@ -16,9 +16,17 @@ import ntype from require "moonscript.types"
 import concat, insert from table
 import pos_to_line, get_closest_line, trim from util
 
+mtype = util.moon.type
+
 export tree, value, format_error
 export Block, RootBlock
 
+insert_many = (tbl, ...) ->
+  i = #tbl + 1
+  for val in *{...}
+    tbl[i] = val
+    i += 1
+
 -- buffer for building up a line
 class Line
   _append_single: (item) =>
@@ -37,16 +45,34 @@ class Line
     @_append_single item for item in *{...}
     nil
 
+  -- todo: remove concats from here
   render: =>
-    buff = {}
-    for i = 1,#self
-      c = self[i]
-      insert buff, if util.moon.type(c) == Block
-        c\bubble!
-        c\render!
-      else
-        c
-    concat buff
+    parts = {}
+    current = {}
+
+    add_current = ->
+      insert parts, table.concat current
+
+    for chunk in *@
+      switch mtype chunk
+        when Block
+          for block_chunk in *{chunk\render!}
+            if "string" == type block_chunk
+              insert current, block_chunk
+            else
+              add_current!
+              insert parts, block_chunk
+              current = {}
+        else
+          insert current, chunk
+
+    if #current > 0
+      add_current!
+
+    unpack parts
+
+
+  __tostring: => "Line<#{@render!}>"
 
 class Block
   header: "do"
@@ -168,8 +194,8 @@ class Block
         @_posmap[@current_line] = @last_pos
 
   -- add raw text as new line
-  add_line_text: (text) =>
-    insert @_lines, text
+  add_raw: (item) =>
+    insert @_lines, item
 
   append_line_table: (sub_table, offset) =>
     offset = offset + @current_line
@@ -193,52 +219,43 @@ class Block
 
   -- add a line object
   add: (line) =>
-    t = util.moon.type line
-
-    if t == "string"
-      @add_line_text line
-    elseif t == Block
-      @add @line line
-    elseif t == Line
-      @add_line_tables line
-      @add_line_text line\render!
-      @current_line += 1
-    else
-      error "Adding unknown item"
-    nil
-
-  _insert_breaks: =>
-    for i = 1, #@_lines - 1
-      left, right = @_lines[i], @_lines[i+1]
-      lc = left\sub(-1)
-      if (lc == ")" or lc == "]") and right\sub(1,1) == "("
-        @_lines[i] = @_lines[i]..";"
-
-  render: =>
-    flatten = (line) ->
-      if type(line) == "string"
-        line
+    -- print "adding", line
+    switch util.moon.type line
+      when "string"
+        insert @_lines, line
+      when Block
+        insert_many @_lines, line\render!
+      when Line
+        insert_many @_lines, line\render!
       else
+        error "Adding unknown item"
+
+  flatten = (line) ->
+    switch mtype line
+      when Line
         line\render!
+      else
+        line
 
-    header = flatten @header
+  -- todo: pass in buffer as argument
+  render: =>
+    out = { flatten @header }
 
-    if #@_lines == 0
+    lines = for line in *@_lines
+      flatten line
+
+    if @next
+      insert out, lines
+      insert_many out, @next\render!
+    else
       footer = flatten @footer
-      return concat {header, footer}, " "
+      if #lines == 0 and #out == 1
+        out[1] ..= " " ..footer
+      else
+        insert out, lines
+        insert out, footer
 
-    indent = indent_char\rep @indent
-
-    -- inject semicolons for ambiguous lines
-    if not @delim then @_insert_breaks!
-
-    body = indent .. concat @_lines, (@delim or "") .. "\n" .. indent
-
-    concat {
-      header,
-      body,
-      indent_char\rep(@indent - 1) .. if @next then @next\render! else flatten @footer
-    }, "\n"
+    unpack out
 
   block: (header, footer) =>
     Block self, header, footer
@@ -299,6 +316,28 @@ class Block
     @_lines = {}
     @stms fn lines
 
+
+flatten_lines = (lines, indent=nil, buffer={}) ->
+  for i = 1, #lines
+    l = lines[i]
+    switch type l
+      when "string"
+        insert buffer, indent if indent
+        insert buffer, l
+
+        -- insert breaks between ambiguous statements
+        if "string" == type lines[i + 1]
+          lc = l\sub(-1)
+          if (lc == ")" or lc == "]") and lines[i + 1]\sub(1,1) == "("
+            insert buffer, ";"
+
+        insert buffer, "\n"
+        last = l
+      when "table"
+        flatten_lines l, indent and indent .. indent_char or indent_char, buffer
+
+  buffer
+
 class RootBlock extends Block
   new: (...) =>
     @root = self
@@ -307,8 +346,13 @@ class RootBlock extends Block
   __tostring: => "RootBlock<>"
 
   render: =>
-    @_insert_breaks!
-    concat @_lines, "\n"
+    -- @_insert_breaks!
+    -- concat @_lines, "\n"
+
+    -- print util.dump @_lines
+    buffer = flatten_lines @_lines
+    buffer[#buffer] = nil if buffer[#buffer] == "\n"
+    table.concat buffer
 
 format_error = (msg, pos, file_str) ->
   line = pos_to_line file_str, pos
diff --git a/moonscript/compile/statement.lua b/moonscript/compile/statement.lua
index e773203..8eb383c 100644
--- a/moonscript/compile/statement.lua
+++ b/moonscript/compile/statement.lua
@@ -19,7 +19,7 @@ line_compile = {
     local _list_0 = node[2]
     for _index_0 = 1, #_list_0 do
       local line = _list_0[_index_0]
-      self:add(line)
+      self:add_raw(line)
     end
   end,
   declare = function(self, node)
diff --git a/moonscript/compile/statement.moon b/moonscript/compile/statement.moon
index 00f9f38..9fcd9e3 100644
--- a/moonscript/compile/statement.moon
+++ b/moonscript/compile/statement.moon
@@ -18,7 +18,7 @@ line_compile =
 
   lines: (node) =>
     for line in *node[2]
-      @add line
+      @add_raw line
 
   declare: (node) =>
     names = node[2]
diff --git a/moonscript/compile/value.lua b/moonscript/compile/value.lua
index 4479b7a..d8fce5f 100644
--- a/moonscript/compile/value.lua
+++ b/moonscript/compile/value.lua
@@ -8,6 +8,7 @@ do
   ntype = _table_0.ntype
 end
 local concat, insert = table.concat, table.insert
+local table_delim = ","
 value_compile = {
   exp = function(self, node)
     local _comp
@@ -226,7 +227,6 @@ value_compile = {
     local _, items = unpack(node)
     do
       local _with_0 = self:block("{", "}")
-      _with_0.delim = ","
       local format_line
       format_line = function(tuple)
         if #tuple == 2 then
@@ -253,10 +253,13 @@ value_compile = {
         end
       end
       if items then
-        local _list_0 = items
-        for _index_0 = 1, #_list_0 do
-          local line = _list_0[_index_0]
-          _with_0:add(format_line(line))
+        local count = #items
+        for i, tuple in ipairs(items) do
+          local line = format_line(tuple)
+          if not (count == i) then
+            line:append(table_delim)
+          end
+          _with_0:add(line)
         end
       end
       return _with_0
diff --git a/moonscript/compile/value.moon b/moonscript/compile/value.moon
index 0e6cdc9..c9d43c9 100644
--- a/moonscript/compile/value.moon
+++ b/moonscript/compile/value.moon
@@ -11,6 +11,8 @@ import concat, insert from table
 
 export value_compile
 
+table_delim = ","
+
 value_compile =
   -- list of values separated by binary operators
   exp: (node) =>
@@ -129,8 +131,6 @@ value_compile =
   table: (node) =>
     _, items = unpack node
     with @block "{", "}"
-      .delim = ","
-
       format_line = (tuple) ->
         if #tuple == 2
           key, value = unpack tuple
@@ -152,7 +152,11 @@ value_compile =
           @line \value tuple[1]
 
       if items
-        \add format_line line for line in *items
+        count = #items
+        for i, tuple in ipairs items
+          line = format_line tuple
+          line\append table_delim unless count == i
+          \add line
 
   minus: (node) =>
     @line "-", @value node[2]
diff --git a/moonscript/transform.moon b/moonscript/transform.moon
index 7a839d4..b44330d 100644
--- a/moonscript/transform.moon
+++ b/moonscript/transform.moon
@@ -210,7 +210,7 @@ Statement = Transformer {
     transformed or node
 
   continue: (node) =>
-    continue_name = @send"continue"
+    continue_name = @send "continue"
     error "continue must be inside of a loop" unless continue_name
     build.group {
       build.assign_one continue_name, "true"