From 4185f741da89db237ee68920cb155d64d2fac356 Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Fri, 21 Jun 2019 02:28:36 -0400
Subject: Separated reading and writing binary data (lumping them together was
 a bad idea in the first place).

---
 stdlib/source/lux/control/parser/binary.lux        |   8 +-
 stdlib/source/lux/data/format/binary.lux           | 290 +++++++++------------
 stdlib/source/lux/target/jvm/attribute.lux         |  24 +-
 stdlib/source/lux/target/jvm/attribute/code.lux    |  56 ++--
 .../lux/target/jvm/attribute/code/exception.lux    |  26 +-
 .../source/lux/target/jvm/attribute/code/label.lux |  14 +-
 .../source/lux/target/jvm/attribute/constant.lux   |  15 +-
 stdlib/source/lux/target/jvm/class.lux             |  68 ++---
 stdlib/source/lux/target/jvm/constant.lux          | 146 +++++++----
 stdlib/source/lux/target/jvm/constant/pool.lux     |  16 +-
 stdlib/source/lux/target/jvm/constant/tag.lux      |  17 +-
 stdlib/source/lux/target/jvm/encoding/unsigned.lux |  23 +-
 stdlib/source/lux/target/jvm/field.lux             |  32 +--
 stdlib/source/lux/target/jvm/index.lux             |  17 +-
 stdlib/source/lux/target/jvm/magic.lux             |  12 +-
 stdlib/source/lux/target/jvm/method.lux            |  32 +--
 stdlib/source/lux/target/jvm/modifier.lux          |  17 +-
 stdlib/source/lux/target/jvm/version.lux           |  19 +-
 stdlib/source/test/lux/target/jvm.lux              |   2 +-
 19 files changed, 420 insertions(+), 414 deletions(-)

(limited to 'stdlib/source')

diff --git a/stdlib/source/lux/control/parser/binary.lux b/stdlib/source/lux/control/parser/binary.lux
index 442bf68b2..89a9c709d 100644
--- a/stdlib/source/lux/control/parser/binary.lux
+++ b/stdlib/source/lux/control/parser/binary.lux
@@ -83,6 +83,10 @@
     (let [parser (body (rec body))]
       (parser input))))
 
+(def: #export any
+  (Parser Any)
+  (//@wrap []))
+
 (def: #export bit
   (Parser Bit)
   (function (_ [offset binary])
@@ -172,13 +176,13 @@
 
 (def: #export maybe
   (All [a] (-> (Parser a) (Parser (Maybe a))))
-  (..or (//@wrap [])))
+  (..or ..any))
 
 (def: #export (list value)
   (All [a] (-> (Parser a) (Parser (List a))))
   (..rec
    (function (_ recur)
-     (..or (//@wrap [])
+     (..or ..any
            (//.and value recur)))))
 
 (def: #export name
diff --git a/stdlib/source/lux/data/format/binary.lux b/stdlib/source/lux/data/format/binary.lux
index 550d4a177..67f36609e 100644
--- a/stdlib/source/lux/data/format/binary.lux
+++ b/stdlib/source/lux/data/format/binary.lux
@@ -48,207 +48,175 @@
 (type: #export (Writer a)
   (-> a Mutation))
 
-(type: #export (Format a)
-  {#reader (Parser a)
-   #writer (Writer a)})
-
-(def: #export (adapt post-read pre-write format)
-  (All [a a']
-    (-> (-> a a')
-        (-> a' a)
-        (Format a)
-        (Format a')))
-  (let [(^open "_@.") format]
-    {#reader (|> _@reader (<>@map post-read))
-     #writer (|>> pre-write _@writer)}))
-
-(def: #export (write format value)
-  (All [a] (-> (Format a) a Binary))
-  (let [[valueS valueT] ((get@ #writer format) value)]
+(def: #export (run writer value)
+  (All [a] (-> (Writer a) a Binary))
+  (let [[valueS valueT] (writer value)]
     (|> valueS binary.create [0] valueT product.right)))
 
-(template [<name> <size> <parser> <write>]
+(template [<name> <size> <write>]
   [(def: #export <name>
-     (Format (I64 Any))
-     {#reader <parser>
-      #writer (function (_ value)
-                [<size>
-                 (function (_ [offset binary])
-                   [(n/+ <size> offset)
-                    (|> binary
-                        (<write> offset value)
-                        error.assume)])])})]
-
-  [bits/8  /.size/8  /.bits/8  binary.write/8]
-  [bits/16 /.size/16 /.bits/16 binary.write/16]
-  [bits/32 /.size/32 /.bits/32 binary.write/32]
-  [bits/64 /.size/64 /.bits/64 binary.write/64]
+     (Writer (I64 Any))
+     (function (_ value)
+       [<size>
+        (function (_ [offset binary])
+          [(n/+ <size> offset)
+           (|> binary
+               (<write> offset value)
+               error.assume)])]))]
+
+  [bits/8  /.size/8  binary.write/8]
+  [bits/16 /.size/16 binary.write/16]
+  [bits/32 /.size/32 binary.write/32]
+  [bits/64 /.size/64 binary.write/64]
   )
 
-(def: #export (or leftB rightB)
-  (All [l r] (-> (Format l) (Format r) (Format (| l r))))
-  {#reader (/.or (get@ #reader leftB)
-                 (get@ #reader rightB))
-   #writer (function (_ altV)
-             (case altV
-               (#.Left leftV)
-               (let [[leftS leftT] ((get@ #writer leftB) leftV)]
-                 [(.inc leftS)
-                  (function (_ [offset binary])
-                    (|> binary
-                        (binary.write/8 offset 0)
-                        error.assume
-                        [(.inc offset)]
-                        leftT))])
-               
-               (#.Right rightV)
-               (let [[rightS rightT] ((get@ #writer rightB) rightV)]
-                 [(.inc rightS)
-                  (function (_ [offset binary])
-                    (|> binary
-                        (binary.write/8 offset 1)
-                        error.assume
-                        [(.inc offset)]
-                        rightT))])
-               ))})
-
-(def: #export (and preB postB)
-  (All [a b] (-> (Format a) (Format b) (Format [a b])))
-  {#reader (<>.and (get@ #reader preB) (get@ #reader postB))
-   #writer (function (_ [preV postV])
-             (:: ..monoid compose
-                 ((get@ #writer preB) preV)
-                 ((get@ #writer postB) postV)))})
+(def: #export (or left right)
+  (All [l r] (-> (Writer l) (Writer r) (Writer (| l r))))
+  (function (_ altV)
+    (case altV
+      (#.Left leftV)
+      (let [[leftS leftT] (left leftV)]
+        [(.inc leftS)
+         (function (_ [offset binary])
+           (|> binary
+               (binary.write/8 offset 0)
+               error.assume
+               [(.inc offset)]
+               leftT))])
+      
+      (#.Right rightV)
+      (let [[rightS rightT] (right rightV)]
+        [(.inc rightS)
+         (function (_ [offset binary])
+           (|> binary
+               (binary.write/8 offset 1)
+               error.assume
+               [(.inc offset)]
+               rightT))])
+      )))
+
+(def: #export (and pre post)
+  (All [a b] (-> (Writer a) (Writer b) (Writer [a b])))
+  (function (_ [preV postV])
+    (:: ..monoid compose (pre preV) (post postV))))
 
 (def: #export (rec body)
-  (All [a] (-> (-> (Format a) (Format a)) (Format a)))
-  {#reader (function (_ input)
-             (let [reader (get@ #reader (body (rec body)))]
-               (reader input)))
-   #writer (function (_ value)
-             (let [writer (get@ #writer (body (rec body)))]
-               (writer value)))})
-
-(def: #export (ignore default)
-  (All [a] (-> a (Format a)))
-  {#reader (<>@wrap default)
-   #writer (function (_ value)
-             ..no-op)})
+  (All [a] (-> (-> (Writer a) (Writer a)) (Writer a)))
+  (function (_ value)
+    (let [writer (body (rec body))]
+      (writer value))))
 
 (def: #export any
-  (Format Any)
-  (ignore []))
+  (Writer Any)
+  (function.constant ..no-op))
 
 (def: #export bit
-  (Format Bit)
-  {#reader /.bit
-   #writer (function (_ value)
-             [1
-              (function (_ [offset binary])
-                [(n/+ 1 offset)
-                 (|> binary
-                     (binary.write/8 offset (if value 1 0))
-                     error.assume)])])})
-
-(def: #export nat (Format Nat) (:assume ..bits/64))
-(def: #export int (Format Int) (:assume ..bits/64))
-(def: #export rev (Format Rev) (:assume ..bits/64))
+  (Writer Bit)
+  (function (_ value)
+    [1
+     (function (_ [offset binary])
+       [(n/+ 1 offset)
+        (|> binary
+            (binary.write/8 offset (if value 1 0))
+            error.assume)])]))
+
+(template [<name> <type>]
+  [(def: #export <name> (Writer <type>) (|>> .i64 ..bits/64))]
+
+  [nat Nat]
+  [int Int]
+  [rev Rev]
+  )
 
 (def: #export frac
-  (Format Frac)
-  (let [(^slots [#writer]) ..bits/64]
-    {#reader /.frac
-     #writer (|>> frac.frac-to-bits writer)}))
+  (Writer Frac)
+  (|>> frac.frac-to-bits ..bits/64))
 
-(template [<name> <bits> <size> <parser> <write>]
+(template [<name> <bits> <size> <write>]
   [(def: #export <name>
-     (Format Binary)
-     {#reader <parser>
-      #writer (let [mask (..mask <size>)]
-                (function (_ value)
-                  (let [size (|> value binary.size (i64.and mask))
-                        size' (n/+ <size> size)]
-                    [size'
-                     (function (_ [offset binary])
-                       [(n/+ size' offset)
-                        (error.assume
-                         (do error.monad
-                           [_ (<write> offset size binary)]
-                           (binary.copy size 0 value (n/+ <size> offset) binary)))])])))})]
-
-  [binary/8  ..bits/8  /.size/8  /.binary/8 binary.write/8]
-  [binary/16 ..bits/16 /.size/16 /.binary/16 binary.write/16]
-  [binary/32 ..bits/32 /.size/32 /.binary/32 binary.write/32]
-  [binary/64 ..bits/64 /.size/64 /.binary/64 binary.write/64]
+     (Writer Binary)
+     (let [mask (..mask <size>)]
+       (function (_ value)
+         (let [size (|> value binary.size (i64.and mask))
+               size' (n/+ <size> size)]
+           [size'
+            (function (_ [offset binary])
+              [(n/+ size' offset)
+               (error.assume
+                (do error.monad
+                  [_ (<write> offset size binary)]
+                  (binary.copy size 0 value (n/+ <size> offset) binary)))])]))))]
+
+  [binary/8  ..bits/8  /.size/8  binary.write/8]
+  [binary/16 ..bits/16 /.size/16 binary.write/16]
+  [binary/32 ..bits/32 /.size/32 binary.write/32]
+  [binary/64 ..bits/64 /.size/64 binary.write/64]
   )
 
-(template [<name> <parser> <binary>]
+(template [<name> <binary>]
   [(def: #export <name>
-     (Format Text)
-     {#reader <parser>
-      #writer (let [(^open "binary@.") <binary>]
-                (|>> encoding.to-utf8 binary@writer))})]
+     (Writer Text)
+     (|>> encoding.to-utf8 <binary>))]
 
-  [utf8/8  /.utf8/8 ..binary/8]
-  [utf8/16 /.utf8/16 ..binary/16]
-  [utf8/32 /.utf8/32 ..binary/32]
-  [utf8/64 /.utf8/64 ..binary/64]
+  [utf8/8  ..binary/8]
+  [utf8/16 ..binary/16]
+  [utf8/32 ..binary/32]
+  [utf8/64 ..binary/64]
   )
 
 (def: #export text ..utf8/64)
 
-(template [<name> <with-offset> <bits> <size> <parser> <write>]
-  [(def: #export (<with-offset> extra-count valueF)
-     (All [v] (-> Nat (Format v) (Format (Row v))))
-     {#reader (<parser> extra-count (get@ #reader valueF))
-      #writer (function (_ value)
-                (let [original-count (row.size value)
-                      capped-count (i64.and (..mask <size>)
-                                            original-count)
-                      value (if (n/= original-count capped-count)
-                              value
-                              (|> value row.to-list (list.take capped-count) row.from-list))
-                      (^open "mutation@.") ..monoid
-                      [size mutation] (|> value
-                                          (row@map (get@ #writer valueF))
-                                          (:: row.fold fold
-                                              (function (_ post pre)
-                                                (mutation@compose pre post))
-                                              mutation@identity))]
-                  [(n/+ <size> size)
-                   (function (_ [offset binary])
-                     (error.assume
-                      (do error.monad
-                        [_ (<write> offset (n/+ extra-count capped-count) binary)]
-                        (wrap (mutation [(n/+ <size> offset) binary])))))]))})
+(template [<name> <with-offset> <bits> <size> <write>]
+  [(def: #export (<with-offset> extra-count valueW)
+     (All [v] (-> Nat (Writer v) (Writer (Row v))))
+     (function (_ value)
+       (let [original-count (row.size value)
+             capped-count (i64.and (..mask <size>)
+                                   original-count)
+             value (if (n/= original-count capped-count)
+                     value
+                     (|> value row.to-list (list.take capped-count) row.from-list))
+             (^open "mutation@.") ..monoid
+             [size mutation] (|> value
+                                 (row@map valueW)
+                                 (:: row.fold fold
+                                     (function (_ post pre)
+                                       (mutation@compose pre post))
+                                     mutation@identity))]
+         [(n/+ <size> size)
+          (function (_ [offset binary])
+            (error.assume
+             (do error.monad
+               [_ (<write> offset (n/+ extra-count capped-count) binary)]
+               (wrap (mutation [(n/+ <size> offset) binary])))))])))
 
    (def: #export <name>
-     (All [v] (-> (Format v) (Format (Row v))))
+     (All [v] (-> (Writer v) (Writer (Row v))))
      (<with-offset> 0))]
 
-  [row/8  row/8'  ..bits/8  /.size/8  /.row/8' binary.write/8]
-  [row/16 row/16' ..bits/16 /.size/16 /.row/16' binary.write/16]
-  [row/32 row/32' ..bits/32 /.size/32 /.row/32' binary.write/32]
-  [row/64 row/64' ..bits/64 /.size/64 /.row/64' binary.write/64]
+  [row/8  row/8'  ..bits/8  /.size/8  binary.write/8]
+  [row/16 row/16' ..bits/16 /.size/16 binary.write/16]
+  [row/32 row/32' ..bits/32 /.size/32 binary.write/32]
+  [row/64 row/64' ..bits/64 /.size/64 binary.write/64]
   )
 
 (def: #export maybe
-  (All [a] (-> (Format a) (Format (Maybe a))))
+  (All [a] (-> (Writer a) (Writer (Maybe a))))
   (..or ..any))
 
 (def: #export (list value)
-  (All [a] (-> (Format a) (Format (List a))))
+  (All [a] (-> (Writer a) (Writer (List a))))
   (..rec
    (function (_ recur)
      (..or ..any
            (..and value recur)))))
 
 (def: #export name
-  (Format Name)
+  (Writer Name)
   (..and ..text ..text))
 
 (def: #export type
-  (Format Type)
+  (Writer Type)
   (..rec
    (function (_ type)
      (let [pair (..and type type)
@@ -280,11 +248,11 @@
            )))))
 
 (def: #export cursor
-  (Format Cursor)
+  (Writer Cursor)
   ($_ ..and ..text ..nat ..nat))
 
 (def: #export code
-  (Format Code)
+  (Writer Code)
   (..rec
    (function (_ code)
      (let [sequence (..list code)
diff --git a/stdlib/source/lux/target/jvm/attribute.lux b/stdlib/source/lux/target/jvm/attribute.lux
index 06400ef93..662da93a9 100644
--- a/stdlib/source/lux/target/jvm/attribute.lux
+++ b/stdlib/source/lux/target/jvm/attribute.lux
@@ -12,7 +12,7 @@
     ["." product]
     ["." error]
     [format
-     [".F" binary (#+ Writer Format) ("#@." monoid)]]]]
+     [".F" binary (#+ Writer) ("#@." monoid)]]]]
   ["." // #_
    ["#." index (#+ Index)]
    [encoding
@@ -42,8 +42,8 @@
     (-> (Writer about)
         (Writer (Info about))))
   (function (_ [name length info])
-    (let [[nameS nameT] ((get@ #binaryF.writer //index.format) name)
-          [lengthS lengthT] ((get@ #binaryF.writer //unsigned.u4-format) length)
+    (let [[nameS nameT] (//index.writer name)
+          [lengthS lengthT] (//unsigned.u4-writer length)
           [infoS infoT] (writer info)]
       [($_ n/+ nameS lengthS infoS)
        (|>> nameT lengthT infoT)])))
@@ -113,7 +113,7 @@
 
 (exception: #export invalid-attribute)
 
-(def: #export (reader pool)
+(def: #export (parser pool)
   (-> Pool (Parser Attribute))
   (let [?@constant (|> ..constant-name
                        //constant/pool.find-utf8
@@ -125,15 +125,15 @@
                    product.right)
         (^open "_@.") (error.equivalence //index.equivalence)]
     (<>.rec
-     (function (_ reader)
+     (function (_ parser)
        (do <>.monad
-         [@name (get@ #binaryF.reader //index.format)
-          length (get@ #binaryF.reader //unsigned.u4-format)]
+         [@name //index.parser
+          length //unsigned.u4-parser]
          (cond (_@= ?@constant (#error.Success @name))
-               (:: @ map (..constant' @name) (get@ #binaryF.reader /constant.format))
+               (:: @ map (..constant' @name) /constant.parser)
                
                (_@= ?@code (#error.Success @name))
-               (:: @ map (..code' @name) (/code.reader reader))
+               (:: @ map (..code' @name) (/code.parser parser))
 
                ## else
                (<>.fail (exception.construct ..invalid-attribute []))))))))
@@ -142,9 +142,7 @@
   (Writer Attribute)
   (case value
     (#Constant attribute)
-    ((info-writer (get@ #binaryF.writer /constant.format))
-     attribute)
+    ((info-writer /constant.writer) attribute)
     
     (#Code attribute)
-    ((info-writer (/code.writer writer))
-     attribute)))
+    ((info-writer (/code.writer writer)) attribute)))
diff --git a/stdlib/source/lux/target/jvm/attribute/code.lux b/stdlib/source/lux/target/jvm/attribute/code.lux
index de7ce719a..88b4eb7c9 100644
--- a/stdlib/source/lux/target/jvm/attribute/code.lux
+++ b/stdlib/source/lux/target/jvm/attribute/code.lux
@@ -63,52 +63,38 @@
       ))
 
 ## https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.3
-(def: #export (reader reader)
+(def: #export (parser parser)
   (All [Attribute] (-> (Parser Attribute) (Parser (Code Attribute))))
-  (let [u2-reader (get@ #binaryF.reader
-                        ///unsigned.u2-format)]
-    ($_ <>.and
-        ## u2 max_stack;
-        u2-reader
-        ## u2 max_locals;
-        u2-reader
-        ## u4 code_length;
-        ## u1 code[code_length];
-        <2>.binary/32
-        ## u2 exception_table_length;
-        ## exception_table[exception_table_length];
-        (<2>.row/16 (get@ #binaryF.reader
-                          /exception.format))
-        ## u2 attributes_count;
-        ## attribute_info attributes[attributes_count];
-        (<2>.row/16 reader)
-        )))
+  ($_ <>.and
+      ## u2 max_stack;
+      ///unsigned.u2-parser
+      ## u2 max_locals;
+      ///unsigned.u2-parser
+      ## u4 code_length;
+      ## u1 code[code_length];
+      <2>.binary/32
+      ## u2 exception_table_length;
+      ## exception_table[exception_table_length];
+      (<2>.row/16 /exception.parser)
+      ## u2 attributes_count;
+      ## attribute_info attributes[attributes_count];
+      (<2>.row/16 parser)
+      ))
 
 (def: #export (writer writer code)
   (All [Attribute] (-> (Writer Attribute) (Writer (Code Attribute))))
   ($_ binaryF@compose
       ## u2 max_stack;
-      ((get@ #binaryF.writer ///unsigned.u2-format)
-       (get@ #max-stack code))
+      (///unsigned.u2-writer (get@ #max-stack code))
       ## u2 max_locals;
-      ((get@ #binaryF.writer ///unsigned.u2-format)
-       (get@ #max-locals code))
+      (///unsigned.u2-writer (get@ #max-locals code))
       ## u4 code_length;
       ## u1 code[code_length];
-      ((get@ #binaryF.writer binaryF.binary/32)
-       (get@ #code code))
+      (binaryF.binary/32 (get@ #code code))
       ## u2 exception_table_length;
       ## exception_table[exception_table_length];
-      ((get@ #binaryF.writer (binaryF.row/16 /exception.format))
-       (get@ #exception-table code))
+      ((binaryF.row/16 /exception.writer) (get@ #exception-table code))
       ## u2 attributes_count;
       ## attribute_info attributes[attributes_count];
-      ((get@ #binaryF.writer (binaryF.row/16 {## TODO: Get rid of this dirty hack ASAP
-                                              #binaryF.reader (:share [Attribute]
-                                                                      {(Writer Attribute)
-                                                                       writer}
-                                                                      {(Parser Attribute)
-                                                                       (<>.fail "")})
-                                              #binaryF.writer writer}))
-       (get@ #attributes code))
+      ((binaryF.row/16 writer) (get@ #attributes code))
       ))
diff --git a/stdlib/source/lux/target/jvm/attribute/code/exception.lux b/stdlib/source/lux/target/jvm/attribute/code/exception.lux
index c1f4bf581..6f6b8a0be 100644
--- a/stdlib/source/lux/target/jvm/attribute/code/exception.lux
+++ b/stdlib/source/lux/target/jvm/attribute/code/exception.lux
@@ -2,9 +2,12 @@
   [lux #*
    [abstract
     ["." equivalence (#+ Equivalence)]]
+   [control
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     [format
-     [".F" binary (#+ Format)]]]]
+     [".F" binary (#+ Writer)]]]]
   ["." // #_
    ["#." label (#+ Label)]
    ["//#" /// #_
@@ -42,11 +45,20 @@
       ////unsigned.u2-bytes
       ))
 
-(def: #export format
-  (Format Exception)
+(def: #export parser
+  (Parser Exception)
+  ($_ <>.and
+      //label.parser
+      //label.parser
+      //label.parser
+      ////index.parser
+      ))
+
+(def: #export writer
+  (Writer Exception)
   ($_ binaryF.and
-      //label.format
-      //label.format
-      //label.format
-      ////index.format
+      //label.writer
+      //label.writer
+      //label.writer
+      ////index.writer
       ))
diff --git a/stdlib/source/lux/target/jvm/attribute/code/label.lux b/stdlib/source/lux/target/jvm/attribute/code/label.lux
index 98be2e8ba..69a8d55c3 100644
--- a/stdlib/source/lux/target/jvm/attribute/code/label.lux
+++ b/stdlib/source/lux/target/jvm/attribute/code/label.lux
@@ -1,10 +1,7 @@
 (.module:
   [lux #*
    [abstract
-    [equivalence (#+ Equivalence)]]
-   [data
-    [format
-     [binary (#+ Format)]]]]
+    [equivalence (#+ Equivalence)]]]
   ["." //// #_
    [encoding
     ["#." unsigned (#+ U2)]]])
@@ -12,9 +9,10 @@
 (type: #export Label U2)
 
 (def: #export equivalence
-  (Equivalence Label)
   ////unsigned.equivalence)
 
-(def: #export format
-  (Format Label)
-  ////unsigned.u2-format)
+(def: #export parser
+  ////unsigned.u2-parser)
+
+(def: #export writer
+  ////unsigned.u2-writer)
diff --git a/stdlib/source/lux/target/jvm/attribute/constant.lux b/stdlib/source/lux/target/jvm/attribute/constant.lux
index 44e48acb1..ec3f534a3 100644
--- a/stdlib/source/lux/target/jvm/attribute/constant.lux
+++ b/stdlib/source/lux/target/jvm/attribute/constant.lux
@@ -2,9 +2,12 @@
   [lux #*
    [abstract
     [equivalence (#+ Equivalence)]]
+   [control
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     [format
-     [binary (#+ Format)]]]]
+     [binary (#+ Writer)]]]]
   ["." /// #_
    [constant (#+ Value)]
    [encoding
@@ -21,6 +24,10 @@
 (def: #export length
   ///unsigned.u2-bytes)
 
-(def: #export format
-  (Format Constant)
-  ///index.format)
+(def: #export parser
+  (Parser Constant)
+  ///index.parser)
+
+(def: #export writer
+  (Writer Constant)
+  ///index.writer)
diff --git a/stdlib/source/lux/target/jvm/class.lux b/stdlib/source/lux/target/jvm/class.lux
index 38315c3b4..516dec1fc 100644
--- a/stdlib/source/lux/target/jvm/class.lux
+++ b/stdlib/source/lux/target/jvm/class.lux
@@ -12,7 +12,7 @@
     [number (#+)
      [i64 (#+)]]
     [format
-     [".F" binary (#+ Writer Format) ("#@." monoid)]]
+     [".F" binary (#+ Writer) ("#@." monoid)]]
     [collection
      ["." row (#+ Row)]]]
    [type
@@ -70,8 +70,6 @@
       (row.equivalence //method.equivalence)
       (row.equivalence //attribute.equivalence)))
 
-(def: default-minor-version Minor (//version.version 0))
-
 (def: (install-classes this super interfaces)
   (-> Internal Internal (List Internal)
       (State Pool [(Index //constant.Class) (Index //constant.Class) (Row (Index //constant.Class))]))
@@ -103,7 +101,7 @@
                       =fields (monad.seq state.monad fields)]
                      (wrap [classes =fields])))]
     {#magic //magic.code
-     #minor-version ..default-minor-version
+     #minor-version //version.default-minor
      #major-version version
      #constant-pool pool
      #modifier modifier
@@ -117,17 +115,17 @@
 (def: #export parser
   (Parser Class)
   (do <>.monad
-    [magic (get@ #binaryF.reader //magic.format)
-     minor-version (get@ #binaryF.reader //version.format)
-     major-version (get@ #binaryF.reader //version.format)
-     constant-pool (get@ #binaryF.reader //constant/pool.format)
-     modifier (get@ #binaryF.reader //modifier.format)
-     this (get@ #binaryF.reader //index.format)
-     super (get@ #binaryF.reader //index.format)
-     interfaces (get@ #binaryF.reader (binaryF.row/16 //index.format))
-     fields (<2>.row/16 (//field.reader constant-pool))
-     methods (<2>.row/16 (//method.reader constant-pool))
-     attributes (<2>.row/16 (//attribute.reader constant-pool))]
+    [magic //magic.parser
+     minor-version //version.parser
+     major-version //version.parser
+     constant-pool //constant/pool.parser
+     modifier //modifier.parser
+     this //index.parser
+     super //index.parser
+     interfaces (<2>.row/16 //index.parser)
+     fields (<2>.row/16 (//field.parser constant-pool))
+     methods (<2>.row/16 (//method.parser constant-pool))
+     attributes (<2>.row/16 (//attribute.parser constant-pool))]
     (wrap {#magic magic
            #minor-version minor-version
            #major-version major-version
@@ -143,32 +141,22 @@
 (def: #export (writer class)
   (Writer Class)
   (`` ($_ binaryF@compose
-          (~~ (template [<format> <slot>]
-                [((get@ #binaryF.writer <format>) (get@ <slot> class))]
+          (~~ (template [<writer> <slot>]
+                [(<writer> (get@ <slot> class))]
 
-                [//magic.format #magic]
-                [//version.format #minor-version]
-                [//version.format #major-version]
-                [//constant/pool.format #constant-pool]
-                [//modifier.format #modifier]
-                [//index.format #this]
-                [//index.format #super]
-                [(binaryF.row/16 //index.format) #interfaces]))
-          (~~ (template [<type> <writer> <slot>]
-                [((get@ #binaryF.writer
-                        (binaryF.row/16 (: (Format <type>)
-                                           {## TODO: Get rid of this dirty hack ASAP
-                                            #binaryF.reader (<>.fail "")
-                                            #binaryF.writer <writer>})))
-                  (get@ <slot> class))]
+                [//magic.writer #magic]
+                [//version.writer #minor-version]
+                [//version.writer #major-version]
+                [//constant/pool.writer #constant-pool]
+                [//modifier.writer #modifier]
+                [//index.writer #this]
+                [//index.writer #super]))
+          (~~ (template [<writer> <slot>]
+                [((binaryF.row/16 <writer>) (get@ <slot> class))]
 
-                [Field //field.writer #fields]
-                [Method //method.writer #methods]
-                [Attribute //attribute.writer #attributes]
+                [//index.writer #interfaces]
+                [//field.writer #fields]
+                [//method.writer #methods]
+                [//attribute.writer #attributes]
                 ))
           )))
-
-(def: #export format
-  (Format Class)
-  {#binaryF.reader ..parser
-   #binaryF.writer ..writer})
diff --git a/stdlib/source/lux/target/jvm/constant.lux b/stdlib/source/lux/target/jvm/constant.lux
index af6b1b078..ee4dc5849 100644
--- a/stdlib/source/lux/target/jvm/constant.lux
+++ b/stdlib/source/lux/target/jvm/constant.lux
@@ -4,14 +4,15 @@
     [monad (#+ do)]
     ["." equivalence (#+ Equivalence)]]
    [control
-    ["." parser]]
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     [number
      ["." int]
      ["." frac]]
     ["." text]
     [format
-     ["." binary (#+ Format) ("#;." monoid)]]
+     [".F" binary (#+ Writer) ("#@." monoid)]]
     [collection
      ["." row (#+ Row)]]]
    [type
@@ -26,9 +27,13 @@
 
 (type: #export UTF8 Text)
 
-(def: utf8-format
-  (Format UTF8)
-  binary.utf8/16)
+(def: utf8-parser
+  (Parser UTF8)
+  <2>.utf8/16)
+
+(def: utf8-writer
+  (Writer UTF8)
+  binaryF.utf8/16)
 
 (abstract: #export Class
   {}
@@ -45,11 +50,13 @@
         (|>> :representation)
         //index.equivalence))
 
-  (def: class-format
-    (Format Class)
-    (binary.adapt (|>> :abstraction)
-                  (|>> :representation)
-                  //index.format))
+  (def: class-parser
+    (Parser Class)
+    (<>@map (|>> :abstraction) //index.parser))
+
+  (def: class-writer
+    (Writer Class)
+    (|>> :representation //index.writer))
   )
 
 (abstract: #export (Value kind)
@@ -84,16 +91,17 @@
     [string  String  (Index UTF8)]
     )
 
-  (template [<name> <type> <read> <write> <base>]
-    [(def: <name>
-       (Format <type>)
-       (binary.adapt (|>> <read> :abstraction)
-                     (|>> :representation <write>)
-                     <base>))]
-
-    [long-format Long .int (<|) binary.bits/64]
-    [double-format Double frac.bits-to-frac frac.frac-to-bits binary.bits/64]
-    [string-format String (<|) (<|) //index.format]
+  (template [<parser-name> <writer-name> <type> <read> <write> <parser> <writer>]
+    [(def: <parser-name>
+       (Parser <type>)
+       (<>@map (|>> <read> :abstraction) <parser>))
+     (def: <writer-name>
+       (Writer <type>)
+       (|>> :representation <write> <writer>))]
+
+    [long-parser long-writer Long .int (<|) <2>.bits/64 binaryF.bits/64]
+    [double-parser double-writer Double frac.bits-to-frac frac.frac-to-bits <2>.bits/64 binaryF.bits/64]
+    [string-parser string-writer String (<|) (<|) //index.parser //index.writer]
     )
   )
 
@@ -105,21 +113,27 @@
   {#class (Index Class)
    #name-and-type (Index Name-And-Type)})
 
-(template [<type> <equivalence> <format>]
+(template [<type> <equivalence> <parser> <writer>]
   [(def: #export <equivalence>
      (Equivalence <type>)
      ($_ equivalence.product
          //index.equivalence
          //index.equivalence))
 
-   (def: #export <format>
-     (Format <type>)
-     ($_ binary.and
-         //index.format
-         //index.format))]
+   (def: #export <parser>
+     (Parser <type>)
+     ($_ <>.and
+         //index.parser
+         //index.parser))
 
-  [Name-And-Type name-and-type-equivalence name-and-type-format]
-  [Reference reference-equivalence reference-format]
+   (def: #export <writer>
+     (Writer <type>)
+     ($_ binaryF.and
+         //index.writer
+         //index.writer))]
+
+  [Name-And-Type name-and-type-equivalence name-and-type-parser name-and-type-writer]
+  [Reference reference-equivalence reference-parser reference-writer]
   )
 
 (type: #export Constant
@@ -177,38 +191,56 @@
   ##     )
   )
 
-(def: #export format
-  (Format Constant)
-  (with-expansions [<constants> (as-is [#UTF8             /tag.utf8             ..utf8-format]
+(def: #export parser
+  (Parser Constant)
+  (with-expansions [<constants> (as-is [#UTF8             /tag.utf8             ..utf8-parser]
+                                       ## TODO: Integer
+                                       ## TODO: Float
+                                       [#Long             /tag.long             ..long-parser]
+                                       [#Double           /tag.double           ..double-parser]
+                                       [#Class            /tag.class            ..class-parser]
+                                       [#String           /tag.string           ..string-parser]
+                                       [#Field            /tag.field            ..reference-parser]
+                                       [#Method           /tag.method           ..reference-parser]
+                                       [#Interface-Method /tag.interface-method ..reference-parser]
+                                       [#Name-And-Type    /tag.name-and-type    ..name-and-type-parser]
+                                       ## TODO: Method-Handle
+                                       ## TODO: Method-Type
+                                       ## TODO: Invoke-Dynamic
+                                       )]
+    (do <>.monad
+      [tag /tag.parser]
+      (`` (cond (~~ (template [<case> <tag> <parser>]
+                      [(/tag;= <tag> tag)
+                       (:: @ map (|>> <case>) <parser>)]
+
+                      <constants>))
+                
+                ## else
+                (<>.fail "Cannot parse constant."))))))
+
+(def: #export writer
+  (Writer Constant)
+  (with-expansions [<constants> (as-is [#UTF8             /tag.utf8             ..utf8-writer]
                                        ## TODO: Integer
                                        ## TODO: Float
-                                       [#Long             /tag.long             ..long-format]
-                                       [#Double           /tag.double           ..double-format]
-                                       [#Class            /tag.class            ..class-format]
-                                       [#String           /tag.string           ..string-format]
-                                       [#Field            /tag.field            ..reference-format]
-                                       [#Method           /tag.method           ..reference-format]
-                                       [#Interface-Method /tag.interface-method ..reference-format]
-                                       [#Name-And-Type    /tag.name-and-type    ..name-and-type-format]
+                                       [#Long             /tag.long             ..long-writer]
+                                       [#Double           /tag.double           ..double-writer]
+                                       [#Class            /tag.class            ..class-writer]
+                                       [#String           /tag.string           ..string-writer]
+                                       [#Field            /tag.field            ..reference-writer]
+                                       [#Method           /tag.method           ..reference-writer]
+                                       [#Interface-Method /tag.interface-method ..reference-writer]
+                                       [#Name-And-Type    /tag.name-and-type    ..name-and-type-writer]
                                        ## TODO: Method-Handle
                                        ## TODO: Method-Type
                                        ## TODO: Invoke-Dynamic
                                        )]
-    {#binary.reader (do parser.monad
-                      [tag (get@ #binary.reader /tag.format)]
-                      (`` (cond (~~ (template [<case> <tag> <format>]
-                                      [(/tag;= <tag> tag)
-                                       (:: @ map (|>> <case>) (get@ #binary.reader <format>))]
-
-                                      <constants>))
-                                
-                                ## else
-                                (parser.fail "Cannot parse constant."))))
-     #binary.writer (function (_ value)
-                      (case value
-                        (^template [<case> <tag> <format>]
-                          (<case> value)
-                          (binary;compose ((get@ #binary.writer /tag.format) <tag>)
-                                          ((get@ #binary.writer <format>) value)))
-                        (<constants>)
-                        ))}))
+    (function (_ value)
+      (case value
+        (^template [<case> <tag> <writer>]
+          (<case> value)
+          (binaryF@compose (/tag.writer <tag>)
+                           (<writer> value)))
+        (<constants>)
+        ))))
diff --git a/stdlib/source/lux/target/jvm/constant/pool.lux b/stdlib/source/lux/target/jvm/constant/pool.lux
index 5fd123319..149a893bb 100644
--- a/stdlib/source/lux/target/jvm/constant/pool.lux
+++ b/stdlib/source/lux/target/jvm/constant/pool.lux
@@ -5,13 +5,15 @@
     [monad (#+ do)]]
    [control
     ["." state (#+ State)]
-    ["." exception (#+ exception:)]]
+    ["." exception (#+ exception:)]
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     ["." error (#+ Error)]
     ["." text ("#;." equivalence)
      ["%" format]]
     [format
-     ["." binary (#+ Format)]]
+     [".F" binary (#+ Writer)]]
     [collection
      ["." list ("#;." fold)]
      ["." row (#+ Row)]]]
@@ -147,9 +149,13 @@
   (let [value (descriptor.descriptor value)]
     (!add #//.UTF8 text;= value)))
 
-(def: #export format
-  (Format Pool)
-  (binary.row/16' ..offset //.format))
+(def: #export parser
+  (Parser Pool)
+  (<2>.row/16' ..offset //.parser))
+
+(def: #export writer
+  (Writer Pool)
+  (binaryF.row/16' ..offset //.writer))
 
 (def: #export empty
   Pool
diff --git a/stdlib/source/lux/target/jvm/constant/tag.lux b/stdlib/source/lux/target/jvm/constant/tag.lux
index b402037c4..ffbe59390 100644
--- a/stdlib/source/lux/target/jvm/constant/tag.lux
+++ b/stdlib/source/lux/target/jvm/constant/tag.lux
@@ -2,9 +2,12 @@
   [lux #*
    [abstract
     [equivalence (#+ Equivalence)]]
+   [control
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     [format
-     ["." binary (#+ Format)]]]
+     [binary (#+ Writer)]]]
    [type
     abstract]]
   [///
@@ -43,9 +46,11 @@
     [18 invoke-dynamic]
     )
 
-  (def: #export format
-    (Format Tag)
-    (binary.adapt (|>> :abstraction)
-                  (|>> :representation)
-                  unsigned.u1-format))
+  (def: #export parser
+    (Parser Tag)
+    (<>@map (|>> :abstraction) unsigned.u1-parser))
+
+  (def: #export writer
+    (Writer Tag)
+    (|>> :representation unsigned.u1-writer))
   )
diff --git a/stdlib/source/lux/target/jvm/encoding/unsigned.lux b/stdlib/source/lux/target/jvm/encoding/unsigned.lux
index f5db7a81a..15dd7a07e 100644
--- a/stdlib/source/lux/target/jvm/encoding/unsigned.lux
+++ b/stdlib/source/lux/target/jvm/encoding/unsigned.lux
@@ -3,12 +3,13 @@
    [abstract
     [equivalence (#+ Equivalence)]]
    [control
-    ["." parser ("#;." functor)]]
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     [number
      ["." i64]]
     [format
-     ["." binary (#+ Format)]]]
+     [".F" binary (#+ Writer)]]]
    [macro
     ["." template]]
    [type
@@ -48,12 +49,16 @@
     )
   )
 
-(template [<name> <type> <format> <post-read>]
-  [(def: #export <name>
-     (Format <type>)
-     (binary.adapt <post-read> ..nat <format>))]
+(template [<parser-name> <writer-name> <type> <parser> <writer> <post-read>]
+  [(def: #export <parser-name>
+     (Parser <type>)
+     (<>@map <post-read> <parser>))
 
-  [u1-format U1 binary.bits/8  ..u1]
-  [u2-format U2 binary.bits/16 ..u2]
-  [u4-format U4 binary.bits/32 ..u4]
+   (def: #export <writer-name>
+     (Writer <type>)
+     (|>> ..nat <writer>))]
+
+  [u1-parser u1-writer U1 <2>.bits/8 binaryF.bits/8  ..u1]
+  [u2-parser u2-writer U2 <2>.bits/16 binaryF.bits/16 ..u2]
+  [u4-parser u4-writer U4 <2>.bits/32 binaryF.bits/32 ..u4]
   )
diff --git a/stdlib/source/lux/target/jvm/field.lux b/stdlib/source/lux/target/jvm/field.lux
index 1535ff639..f050a13a5 100644
--- a/stdlib/source/lux/target/jvm/field.lux
+++ b/stdlib/source/lux/target/jvm/field.lux
@@ -12,7 +12,7 @@
     [number (#+)
      [i64 (#+)]]
     [format
-     [".F" binary (#+ Writer Format) ("#@." monoid)]]
+     [".F" binary (#+ Writer) ("#@." monoid)]]
     [collection
      ["." row (#+ Row)]]]
    [type
@@ -51,29 +51,25 @@
       //index.equivalence
       (row.equivalence //attribute.equivalence)))
 
-(def: #export (reader pool)
+(def: #export (parser pool)
   (-> Pool (Parser Field))
   ($_ <>.and
-      (get@ #binaryF.reader modifier.format)
-      (get@ #binaryF.reader //index.format)
-      (get@ #binaryF.reader //index.format)
-      (<2>.row/16 (//attribute.reader pool))))
+      modifier.parser
+      //index.parser
+      //index.parser
+      (<2>.row/16 (//attribute.parser pool))))
 
 (def: #export (writer field)
   (Writer Field)
-  (let [attribute-format (: (Format Attribute)
-                            {## TODO: Get rid of this dirty hack ASAP
-                             #binaryF.reader (<>.fail "")
-                             #binaryF.writer //attribute.writer})]
-    (`` ($_ binaryF@compose
-            (~~ (template [<format> <slot>]
-                  [((get@ #binaryF.writer <format>) (get@ <slot> field))]
+  (`` ($_ binaryF@compose
+          (~~ (template [<writer> <slot>]
+                [(<writer> (get@ <slot> field))]
 
-                  [modifier.format #modifier]
-                  [//index.format #name]
-                  [//index.format #descriptor]
-                  [(binaryF.row/16 attribute-format) #attributes]))
-            ))))
+                [modifier.writer #modifier]
+                [//index.writer #name]
+                [//index.writer #descriptor]
+                [(binaryF.row/16 //attribute.writer) #attributes]))
+          )))
 
 (def: #export (field modifier name descriptor attributes)
   (-> (Modifier Field) UTF8 (Descriptor (Value Any)) (Row Attribute)
diff --git a/stdlib/source/lux/target/jvm/index.lux b/stdlib/source/lux/target/jvm/index.lux
index 6d7e280f6..32ad5d428 100644
--- a/stdlib/source/lux/target/jvm/index.lux
+++ b/stdlib/source/lux/target/jvm/index.lux
@@ -2,9 +2,12 @@
   [lux #*
    [abstract
     ["." equivalence (#+ Equivalence)]]
+   [control
+    ["<>" parser ("#@." functor)
+     ["<2>" binary (#+ Parser)]]]
    [data
     [format
-     ["." binary (#+ Format)]]]
+     [binary (#+ Writer)]]]
    [type
     abstract]]
   ["." // #_
@@ -30,9 +33,11 @@
         ..number
         //unsigned.equivalence))
 
-  (def: #export format
-    (All [kind] (Format (Index kind)))
-    (binary.adapt ..index
-                  ..number
-                  //unsigned.u2-format))
+  (def: #export parser
+    (All [kind] (Parser (Index kind)))
+    (<>@map ..index //unsigned.u2-parser))
+
+  (def: #export writer
+    (All [kind] (Writer (Index kind)))
+    (|>> ..number //unsigned.u2-writer))
   )
diff --git a/stdlib/source/lux/target/jvm/magic.lux b/stdlib/source/lux/target/jvm/magic.lux
index 73fea4698..0fc0bad14 100644
--- a/stdlib/source/lux/target/jvm/magic.lux
+++ b/stdlib/source/lux/target/jvm/magic.lux
@@ -1,9 +1,7 @@
 (.module:
   [lux #*
    [data
-    [number (#+ hex)]
-    [format
-     [binary (#+ Format)]]]]
+    [number (#+ hex)]]]
   ["." // #_
    [encoding
     ["#." unsigned (#+ U4)]]])
@@ -15,6 +13,8 @@
   Magic
   (//unsigned.u4 (hex "CAFEBABE")))
 
-(def: #export format
-  (Format Magic)
-  //unsigned.u4-format)
+(def: #export parser
+  //unsigned.u4-parser)
+
+(def: #export writer
+  //unsigned.u4-writer)
diff --git a/stdlib/source/lux/target/jvm/method.lux b/stdlib/source/lux/target/jvm/method.lux
index aab21db0d..c59bf7d58 100644
--- a/stdlib/source/lux/target/jvm/method.lux
+++ b/stdlib/source/lux/target/jvm/method.lux
@@ -12,7 +12,7 @@
     [number (#+)
      [i64 (#+)]]
     [format
-     [".F" binary (#+ Writer Format) ("#@." monoid)]]
+     [".F" binary (#+ Writer) ("#@." monoid)]]
     [collection
      ["." row (#+ Row)]]]
    [type
@@ -54,26 +54,22 @@
       //index.equivalence
       (row.equivalence //attribute.equivalence)))
 
-(def: #export (reader pool)
+(def: #export (parser pool)
   (-> Pool (Parser Method))
   ($_ <>.and
-      (get@ #binaryF.reader modifier.format)
-      (get@ #binaryF.reader //index.format)
-      (get@ #binaryF.reader //index.format)
-      (<2>.row/16 (//attribute.reader pool))))
+      modifier.parser
+      //index.parser
+      //index.parser
+      (<2>.row/16 (//attribute.parser pool))))
 
 (def: #export (writer field)
   (Writer Method)
-  (let [attribute-format (: (Format Attribute)
-                            {## TODO: Get rid of this dirty hack ASAP
-                             #binaryF.reader (<>.fail "")
-                             #binaryF.writer //attribute.writer})]
-    (`` ($_ binaryF@compose
-            (~~ (template [<format> <slot>]
-                  [((get@ #binaryF.writer <format>) (get@ <slot> field))]
+  (`` ($_ binaryF@compose
+          (~~ (template [<writer> <slot>]
+                [(<writer> (get@ <slot> field))]
 
-                  [modifier.format #modifier]
-                  [//index.format #name]
-                  [//index.format #descriptor]
-                  [(binaryF.row/16 attribute-format) #attributes]))
-            ))))
+                [modifier.writer #modifier]
+                [//index.writer #name]
+                [//index.writer #descriptor]
+                [(binaryF.row/16 //attribute.writer) #attributes]))
+          )))
diff --git a/stdlib/source/lux/target/jvm/modifier.lux b/stdlib/source/lux/target/jvm/modifier.lux
index 0e354d730..a84ba38bc 100644
--- a/stdlib/source/lux/target/jvm/modifier.lux
+++ b/stdlib/source/lux/target/jvm/modifier.lux
@@ -5,12 +5,13 @@
     ["." monoid (#+ Monoid)]]
    [control
     ["<>" parser
-     ["<c>" code (#+ Parser)]]]
+     ["<c>" code]
+     ["<2>" binary (#+ Parser)]]]
    [data
     ["." number (#+ hex)
      ["." i64]]
     [format
-     [".F" binary (#+ Format)]]
+     [".F" binary (#+ Writer)]]
     [collection
      ["." list ("#@." functor)]]]
    [type
@@ -64,11 +65,13 @@
     Modifier
     (:: ..monoid identity))
 
-  (def: #export format
-    (All [of] (Format (Modifier of)))
-    (let [(^open "_@.") //unsigned.u2-format]
-      {#binaryF.reader (:: <>.functor map (|>> :abstraction) _@reader)
-       #binaryF.writer (|>> :representation _@writer)}))
+  (def: #export parser
+    (All [of] (Parser (Modifier of)))
+    (:: <>.functor map (|>> :abstraction) //unsigned.u2-parser))
+
+  (def: #export writer
+    (All [of] (Writer (Modifier of)))
+    (|>> :representation //unsigned.u2-writer))
   )
 
 (syntax: #export (modifiers: ofT {options (<>.many <c>.any)})
diff --git a/stdlib/source/lux/target/jvm/version.lux b/stdlib/source/lux/target/jvm/version.lux
index f280743ba..7c80928a8 100644
--- a/stdlib/source/lux/target/jvm/version.lux
+++ b/stdlib/source/lux/target/jvm/version.lux
@@ -1,8 +1,5 @@
 (.module:
-  [lux #*
-   [data
-    [format
-     ["." binary (#+ Format)]]]]
+  [lux #*]
   ["." // #_
    [encoding
     ["#." unsigned (#+ U2)]]])
@@ -11,14 +8,12 @@
 (type: #export Minor Version)
 (type: #export Major Version)
 
-(def: #export version
-  (-> Nat Version)
-  //unsigned.u2)
+(def: #export default-minor Minor (//unsigned.u2 0))
 
 (template [<number> <name>]
   [(def: #export <name>
      Major
-     (..version <number>))]
+     (//unsigned.u2 <number>))]
 
   [45 v1_1]
   [46 v1_2]
@@ -34,6 +29,8 @@
   [56 v12]
   )
 
-(def: #export format
-  (Format Version)
-  //unsigned.u2-format)
+(def: #export parser
+  //unsigned.u2-parser)
+
+(def: #export writer
+  //unsigned.u2-writer)
diff --git a/stdlib/source/test/lux/target/jvm.lux b/stdlib/source/test/lux/target/jvm.lux
index 2ef15809b..873d32e09 100644
--- a/stdlib/source/test/lux/target/jvm.lux
+++ b/stdlib/source/test/lux/target/jvm.lux
@@ -97,7 +97,7 @@
                                      (/field.field /field.public field1 descriptor1 (row.row)))
                                (row.row)
                                (row.row))
-           bytecode (binaryF.write /class.format input)
+           bytecode (binaryF.run /class.writer input)
            loader (/loader.memory (/loader.new-library []))]]
     ($_ _.and
         (_.test "Can read a generated class."
-- 
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