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authorEduardo Julian2019-07-06 21:18:16 -0400
committerEduardo Julian2019-07-06 21:18:16 -0400
commit91ac681115d1781655f29aa05d7462b843c40d4d (patch)
tree945435c68e02960fe43c733c3b33ff2a40224d8f /stdlib/source
parent5806d33abd8b8f42d27225b6321c03eaa3a11592 (diff)
Removed the parsing machinery for JVM classes.
Diffstat (limited to 'stdlib/source')
-rw-r--r--stdlib/source/lux/control/parser/binary.lux24
-rw-r--r--stdlib/source/lux/target/jvm/attribute.lux31
-rw-r--r--stdlib/source/lux/target/jvm/attribute/code.lux20
-rw-r--r--stdlib/source/lux/target/jvm/attribute/code/exception.lux12
-rw-r--r--stdlib/source/lux/target/jvm/attribute/constant.lux7
-rw-r--r--stdlib/source/lux/target/jvm/class.lux28
-rw-r--r--stdlib/source/lux/target/jvm/constant.lux64
-rw-r--r--stdlib/source/lux/target/jvm/constant/pool.lux8
-rw-r--r--stdlib/source/lux/target/jvm/constant/tag.lux7
-rw-r--r--stdlib/source/lux/target/jvm/encoding/signed.lux17
-rw-r--r--stdlib/source/lux/target/jvm/encoding/unsigned.lux17
-rw-r--r--stdlib/source/lux/target/jvm/field.lux12
-rw-r--r--stdlib/source/lux/target/jvm/index.lux7
-rw-r--r--stdlib/source/lux/target/jvm/magic.lux3
-rw-r--r--stdlib/source/lux/target/jvm/method.lux12
-rw-r--r--stdlib/source/lux/target/jvm/modifier.lux7
-rw-r--r--stdlib/source/lux/target/jvm/program/jump.lux3
-rw-r--r--stdlib/source/lux/target/jvm/program/resources.lux12
-rw-r--r--stdlib/source/lux/target/jvm/version.lux3
19 files changed, 32 insertions, 262 deletions
diff --git a/stdlib/source/lux/control/parser/binary.lux b/stdlib/source/lux/control/parser/binary.lux
index 5f8ccc122..8d01d2d48 100644
--- a/stdlib/source/lux/control/parser/binary.lux
+++ b/stdlib/source/lux/control/parser/binary.lux
@@ -144,13 +144,11 @@
(def: #export text ..utf8/64)
-(template [<name> <with-offset> <bits> <size>]
- [(def: #export (<with-offset> extra-count valueP)
- (All [v] (-> Nat (Parser v) (Parser (Row v))))
+(template [<name> <bits> <size>]
+ [(def: #export (<name> valueP)
+ (All [v] (-> (Parser v) (Parser (Row v))))
(do //.monad
- [count (|> <bits>
- (//@map .nat)
- (:: @ map (n/- extra-count)))]
+ [count (//@map .nat <bits>)]
(loop [index 0
output (:share [v]
{(Parser v)
@@ -162,16 +160,12 @@
[value valueP]
(recur (.inc index)
(row.add value output)))
- (//@wrap output)))))
-
- (def: #export <name>
- (All [v] (-> (Parser v) (Parser (Row v))))
- (<with-offset> 0))]
+ (//@wrap output)))))]
- [row/8 row/8' ..bits/8 ..size/8]
- [row/16 row/16' ..bits/16 ..size/16]
- [row/32 row/32' ..bits/32 ..size/32]
- [row/64 row/64' ..bits/64 ..size/64]
+ [row/8 ..bits/8 ..size/8]
+ [row/16 ..bits/16 ..size/16]
+ [row/32 ..bits/32 ..size/32]
+ [row/64 ..bits/64 ..size/64]
)
(def: #export maybe
diff --git a/stdlib/source/lux/target/jvm/attribute.lux b/stdlib/source/lux/target/jvm/attribute.lux
index 2f4361960..fef8598e8 100644
--- a/stdlib/source/lux/target/jvm/attribute.lux
+++ b/stdlib/source/lux/target/jvm/attribute.lux
@@ -6,9 +6,7 @@
[control
["." state (#+ State)]
["." try]
- ["." exception (#+ exception:)]
- ["<>" parser
- ["<2>" binary (#+ Parser)]]]
+ ["." exception (#+ exception:)]]
[data
["." product]
[format
@@ -111,33 +109,6 @@
[@name (//constant/pool.utf8 ..code-name)]
(wrap (code' @name specification))))
-(exception: #export invalid-attribute)
-
-(def: #export (parser pool)
- (-> Pool (Parser Attribute))
- (let [?@constant (|> ..constant-name
- //constant/pool.find-utf8
- (state.run pool)
- product.right)
- ?@code (|> ..code-name
- //constant/pool.find-utf8
- (state.run pool)
- product.right)
- (^open "_@.") (try.equivalence //index.equivalence)]
- (<>.rec
- (function (_ parser)
- (do <>.monad
- [@name //index.parser
- length //unsigned.u4-parser]
- (cond (_@= ?@constant (#try.Success @name))
- (:: @ map (..constant' @name) /constant.parser)
-
- (_@= ?@code (#try.Success @name))
- (:: @ map (..code' @name) (/code.parser parser))
-
- ## else
- (<>.fail (exception.construct ..invalid-attribute []))))))))
-
(def: #export (writer value)
(Writer Attribute)
(case value
diff --git a/stdlib/source/lux/target/jvm/attribute/code.lux b/stdlib/source/lux/target/jvm/attribute/code.lux
index dff626c5c..44b3b1b5b 100644
--- a/stdlib/source/lux/target/jvm/attribute/code.lux
+++ b/stdlib/source/lux/target/jvm/attribute/code.lux
@@ -3,9 +3,6 @@
[type (#+ :share)]
[abstract
["." equivalence (#+ Equivalence)]]
- [control
- ["<>" parser
- ["<2>" binary (#+ Parser)]]]
[data
["." binary (#+ Binary)]
[format
@@ -62,23 +59,6 @@
))
## https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.3
-(def: #export (parser parser)
- (All [Attribute] (-> (Parser Attribute) (Parser (Code Attribute))))
- ($_ <>.and
- ## u2 max_stack;
- ## u2 max_locals;
- ///resources.parser
- ## u4 code_length;
- ## u1 code[code_length];
- <2>.binary/32
- ## u2 exception_table_length;
- ## exception_table[exception_table_length];
- (<2>.row/16 /exception.parser)
- ## u2 attributes_count;
- ## attribute_info attributes[attributes_count];
- (<2>.row/16 parser)
- ))
-
(def: #export (writer writer code)
(All [Attribute] (-> (Writer Attribute) (Writer (Code Attribute))))
($_ binaryF@compose
diff --git a/stdlib/source/lux/target/jvm/attribute/code/exception.lux b/stdlib/source/lux/target/jvm/attribute/code/exception.lux
index 19de9c789..003bad74f 100644
--- a/stdlib/source/lux/target/jvm/attribute/code/exception.lux
+++ b/stdlib/source/lux/target/jvm/attribute/code/exception.lux
@@ -2,9 +2,6 @@
[lux #*
[abstract
["." equivalence (#+ Equivalence)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[format
[".F" binary (#+ Writer)]]]]
@@ -46,15 +43,6 @@
////unsigned.u2-bytes
))
-(def: #export parser
- (Parser Exception)
- ($_ <>.and
- ////jump.parser
- ////jump.parser
- ////jump.parser
- ////index.parser
- ))
-
(def: #export writer
(Writer Exception)
($_ binaryF.and
diff --git a/stdlib/source/lux/target/jvm/attribute/constant.lux b/stdlib/source/lux/target/jvm/attribute/constant.lux
index ec3f534a3..4dae93140 100644
--- a/stdlib/source/lux/target/jvm/attribute/constant.lux
+++ b/stdlib/source/lux/target/jvm/attribute/constant.lux
@@ -2,9 +2,6 @@
[lux #*
[abstract
[equivalence (#+ Equivalence)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[format
[binary (#+ Writer)]]]]
@@ -24,10 +21,6 @@
(def: #export length
///unsigned.u2-bytes)
-(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 a99637dcd..bc3670110 100644
--- a/stdlib/source/lux/target/jvm/class.lux
+++ b/stdlib/source/lux/target/jvm/class.lux
@@ -5,8 +5,6 @@
["." equivalence (#+ Equivalence)]
["." monad (#+ do)]]
[control
- ["<>" parser
- ["<2>" binary (#+ Parser)]]
["." state (#+ State)]]
[data
[number (#+)
@@ -113,32 +111,6 @@
#methods (row.from-list =methods)
#attributes attributes}))
-(def: #export parser
- (Parser Class)
- (do <>.monad
- [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
- #constant-pool constant-pool
- #modifier modifier
- #this this
- #super super
- #interfaces interfaces
- #fields fields
- #methods methods
- #attributes attributes})))
-
(def: #export (writer class)
(Writer Class)
(`` ($_ binaryF@compose
diff --git a/stdlib/source/lux/target/jvm/constant.lux b/stdlib/source/lux/target/jvm/constant.lux
index 36c131b00..c157d4abb 100644
--- a/stdlib/source/lux/target/jvm/constant.lux
+++ b/stdlib/source/lux/target/jvm/constant.lux
@@ -3,9 +3,6 @@
[abstract
[monad (#+ do)]
["." equivalence (#+ Equivalence)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[number
["." int]
@@ -27,10 +24,6 @@
(type: #export UTF8 Text)
-(def: utf8-parser
- (Parser UTF8)
- <2>.utf8/16)
-
(def: utf8-writer
(Writer UTF8)
binaryF.utf8/16)
@@ -50,10 +43,6 @@
(|>> :representation)
//index.equivalence))
- (def: class-parser
- (Parser Class)
- (<>@map (|>> :abstraction) //index.parser))
-
(def: class-writer
(Writer Class)
(|>> :representation //index.writer))
@@ -91,17 +80,14 @@
[string String (Index UTF8)]
)
- (template [<parser-name> <writer-name> <type> <read> <write> <parser> <writer>]
- [(def: <parser-name>
- (Parser <type>)
- (<>@map (|>> <read> :abstraction) <parser>))
- (def: <writer-name>
+ (template [<writer-name> <type> <write> <writer>]
+ [(def: <writer-name>
(Writer <type>)
(|>> :representation <write> <writer>))]
- [long-parser long-writer Long .int (<|) <2>.bits/64 binaryF.bits/64]
- [double-parser double-writer Double frac.bits-to-frac frac.frac-to-bits <2>.bits/64 binaryF.bits/64]
- [string-parser string-writer String (<|) (<|) //index.parser //index.writer]
+ [long-writer Long (<|) binaryF.bits/64]
+ [double-writer Double frac.frac-to-bits binaryF.bits/64]
+ [string-writer String (<|) //index.writer]
)
)
@@ -113,27 +99,21 @@
{#class (Index Class)
#name-and-type (Index (Name-And-Type of))})
-(template [<type> <equivalence> <parser> <writer>]
+(template [<type> <equivalence> <writer>]
[(def: #export <equivalence>
(Equivalence (<type> Any))
($_ equivalence.product
//index.equivalence
//index.equivalence))
- (def: <parser>
- (Parser <type>)
- ($_ <>.and
- //index.parser
- //index.parser))
-
(def: <writer>
(Writer (<type> Any))
($_ 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]
+ [Name-And-Type name-and-type-equivalence name-and-type-writer]
+ [Reference reference-equivalence reference-writer]
)
(type: #export Constant
@@ -191,34 +171,6 @@
## )
)
-(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]
diff --git a/stdlib/source/lux/target/jvm/constant/pool.lux b/stdlib/source/lux/target/jvm/constant/pool.lux
index 212c3cb9e..773607858 100644
--- a/stdlib/source/lux/target/jvm/constant/pool.lux
+++ b/stdlib/source/lux/target/jvm/constant/pool.lux
@@ -6,9 +6,7 @@
[control
["." state (#+ State)]
["." try (#+ Try)]
- ["." exception (#+ exception:)]
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
+ ["." exception (#+ exception:)]]
[data
[number
["." int]
@@ -194,10 +192,6 @@
[interface-method #//.Interface-Method Method]
)
-(def: #export parser
- (Parser Pool)
- (<2>.row/16' ..offset //.parser))
-
(def: #export writer
(Writer Pool)
(binaryF.row/16' ..offset //.writer))
diff --git a/stdlib/source/lux/target/jvm/constant/tag.lux b/stdlib/source/lux/target/jvm/constant/tag.lux
index ffbe59390..a3da84812 100644
--- a/stdlib/source/lux/target/jvm/constant/tag.lux
+++ b/stdlib/source/lux/target/jvm/constant/tag.lux
@@ -2,9 +2,6 @@
[lux #*
[abstract
[equivalence (#+ Equivalence)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[format
[binary (#+ Writer)]]]
@@ -46,10 +43,6 @@
[18 invoke-dynamic]
)
- (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/signed.lux b/stdlib/source/lux/target/jvm/encoding/signed.lux
index 7765d4402..c5a7776b3 100644
--- a/stdlib/source/lux/target/jvm/encoding/signed.lux
+++ b/stdlib/source/lux/target/jvm/encoding/signed.lux
@@ -3,9 +3,6 @@
[abstract
[equivalence (#+ Equivalence)]
[order (#+ Order)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[number
["." i64]]
@@ -66,16 +63,12 @@
)
)
-(template [<parser-name> <writer-name> <type> <parser> <writer> <post-read>]
- [(def: #export <parser-name>
- (Parser <type>)
- (<>@map (|>> .int <post-read>) <parser>))
-
- (def: #export <writer-name>
+(template [<writer-name> <type> <writer>]
+ [(def: #export <writer-name>
(Writer <type>)
(|>> ..int <writer>))]
- [s1-parser s1-writer S1 <2>.bits/8 binaryF.bits/8 ..s1]
- [s2-parser s2-writer S2 <2>.bits/16 binaryF.bits/16 ..s2]
- [s4-parser s4-writer S4 <2>.bits/32 binaryF.bits/32 ..s4]
+ [s1-writer S1 binaryF.bits/8]
+ [s2-writer S2 binaryF.bits/16]
+ [s4-writer S4 binaryF.bits/32]
)
diff --git a/stdlib/source/lux/target/jvm/encoding/unsigned.lux b/stdlib/source/lux/target/jvm/encoding/unsigned.lux
index 892d2f86d..b0b8ff312 100644
--- a/stdlib/source/lux/target/jvm/encoding/unsigned.lux
+++ b/stdlib/source/lux/target/jvm/encoding/unsigned.lux
@@ -3,9 +3,6 @@
[abstract
[equivalence (#+ Equivalence)]
[order (#+ Order)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[number
["." i64]]
@@ -64,16 +61,12 @@
)
)
-(template [<parser-name> <writer-name> <type> <parser> <writer> <post-read>]
- [(def: #export <parser-name>
- (Parser <type>)
- (<>@map (|>> .nat <post-read>) <parser>))
-
- (def: #export <writer-name>
+(template [<writer-name> <type> <writer>]
+ [(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]
+ [u1-writer U1 binaryF.bits/8]
+ [u2-writer U2 binaryF.bits/16]
+ [u4-writer U4 binaryF.bits/32]
)
diff --git a/stdlib/source/lux/target/jvm/field.lux b/stdlib/source/lux/target/jvm/field.lux
index f050a13a5..a2cc35f45 100644
--- a/stdlib/source/lux/target/jvm/field.lux
+++ b/stdlib/source/lux/target/jvm/field.lux
@@ -5,9 +5,7 @@
["." equivalence (#+ Equivalence)]
["." monad (#+ do)]]
[control
- ["." state (#+ State)]
- ["<>" parser
- ["<2>" binary (#+ Parser)]]]
+ ["." state (#+ State)]]
[data
[number (#+)
[i64 (#+)]]
@@ -51,14 +49,6 @@
//index.equivalence
(row.equivalence //attribute.equivalence)))
-(def: #export (parser pool)
- (-> Pool (Parser Field))
- ($_ <>.and
- modifier.parser
- //index.parser
- //index.parser
- (<2>.row/16 (//attribute.parser pool))))
-
(def: #export (writer field)
(Writer Field)
(`` ($_ binaryF@compose
diff --git a/stdlib/source/lux/target/jvm/index.lux b/stdlib/source/lux/target/jvm/index.lux
index 32ad5d428..430276f4b 100644
--- a/stdlib/source/lux/target/jvm/index.lux
+++ b/stdlib/source/lux/target/jvm/index.lux
@@ -2,9 +2,6 @@
[lux #*
[abstract
["." equivalence (#+ Equivalence)]]
- [control
- ["<>" parser ("#@." functor)
- ["<2>" binary (#+ Parser)]]]
[data
[format
[binary (#+ Writer)]]]
@@ -33,10 +30,6 @@
..number
//unsigned.equivalence))
- (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 0fc0bad14..ff2d119e4 100644
--- a/stdlib/source/lux/target/jvm/magic.lux
+++ b/stdlib/source/lux/target/jvm/magic.lux
@@ -13,8 +13,5 @@
Magic
(//unsigned.u4 (hex "CAFEBABE")))
-(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 88d43f5b4..2b47be482 100644
--- a/stdlib/source/lux/target/jvm/method.lux
+++ b/stdlib/source/lux/target/jvm/method.lux
@@ -6,9 +6,7 @@
["." monad (#+ do)]]
[control
["." try]
- ["." state (#+ State)]
- ["<>" parser
- ["<2>" binary (#+ Parser)]]]
+ ["." state (#+ State)]]
[data
[number (#+)
[i64 (#+)]]
@@ -87,14 +85,6 @@
//index.equivalence
(row.equivalence //attribute.equivalence)))
-(def: #export (parser pool)
- (-> Pool (Parser Method))
- ($_ <>.and
- //modifier.parser
- //index.parser
- //index.parser
- (<2>.row/16 (//attribute.parser pool))))
-
(def: #export (writer field)
(Writer Method)
(`` ($_ binaryF@compose
diff --git a/stdlib/source/lux/target/jvm/modifier.lux b/stdlib/source/lux/target/jvm/modifier.lux
index 0b2770b94..f7024b669 100644
--- a/stdlib/source/lux/target/jvm/modifier.lux
+++ b/stdlib/source/lux/target/jvm/modifier.lux
@@ -5,8 +5,7 @@
["." monoid (#+ Monoid)]]
[control
["<>" parser
- ["<c>" code]
- ["<2>" binary (#+ Parser)]]]
+ ["<c>" code]]]
[data
["." number (#+ hex)
["." i64]]
@@ -65,10 +64,6 @@
Modifier
(:: ..monoid identity))
- (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))
diff --git a/stdlib/source/lux/target/jvm/program/jump.lux b/stdlib/source/lux/target/jvm/program/jump.lux
index 00b66bede..19f667cfe 100644
--- a/stdlib/source/lux/target/jvm/program/jump.lux
+++ b/stdlib/source/lux/target/jvm/program/jump.lux
@@ -11,9 +11,6 @@
(def: #export equivalence
///signed.equivalence)
-(def: #export parser
- ///signed.s2-parser)
-
(def: #export writer
///signed.s2-writer)
diff --git a/stdlib/source/lux/target/jvm/program/resources.lux b/stdlib/source/lux/target/jvm/program/resources.lux
index 980104e72..fa83c4071 100644
--- a/stdlib/source/lux/target/jvm/program/resources.lux
+++ b/stdlib/source/lux/target/jvm/program/resources.lux
@@ -2,9 +2,6 @@
[lux #*
[abstract
["." equivalence (#+ Equivalence)]]
- [control
- ["<>" parser
- ["<2>" binary (#+ Parser)]]]
[data
[format
[".F" binary (#+ Writer) ("#@." monoid)]]]]
@@ -37,15 +34,6 @@
///unsigned.equivalence
))
-(def: #export parser
- (Parser Resources)
- ($_ <>.and
- ## u2 max_stack;
- ///unsigned.u2-parser
- ## u2 max_locals;
- ///unsigned.u2-parser
- ))
-
(def: #export (writer resources)
(Writer Resources)
($_ binaryF@compose
diff --git a/stdlib/source/lux/target/jvm/version.lux b/stdlib/source/lux/target/jvm/version.lux
index 7c80928a8..48d2dcaa9 100644
--- a/stdlib/source/lux/target/jvm/version.lux
+++ b/stdlib/source/lux/target/jvm/version.lux
@@ -29,8 +29,5 @@
[56 v12]
)
-(def: #export parser
- //unsigned.u2-parser)
-
(def: #export writer
//unsigned.u2-writer)