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(.module:
[lux (#- nat int rev list type)
[control
[monad (#+ do Monad)]
["p" parser]
["ex" exception (#+ exception:)]
[equivalence (#+ Equivalence)]]
[data
[error]
[text
[encoding]
[format (#+ %n)]]
[number]]
[world [blob (#+ Blob)]]])
## Exceptions
(exception: #export (blob-was-not-fully-read {length Nat} {read Nat})
(ex.report ["Blob length" (%n length)]
["Read bytes" (%n read)]))
(exception: #export (invalid-tag {range Nat} {byte Nat})
(ex.report ["Range" (%n range)]
["Byte" (%n byte)]))
## Types
(type: #export Offset Nat)
(type: #export Size Nat)
(def: #export size/8 +1)
(def: #export size/16 +2)
(def: #export size/32 +4)
(def: #export size/64 +8)
(type: #export Read
(p.Parser [Offset Blob]))
(type: #export (Write a)
(-> a [Size (-> Offset Blob Blob)]))
(type: #export (Binary a)
{#read (Read a)
#write (Write a)})
## Operators
(def: #export (read format input)
(All [a] (-> (Binary a) Blob (error.Error a)))
(case ((get@ #read format) [+0 input])
(#error.Error msg)
(#error.Error msg)
(#error.Success [[end _] output])
(let [length (blob.size input)]
(if (n/= end length)
(#error.Success output)
(ex.throw blob-was-not-fully-read [length end])))))
(def: #export (write format value)
(All [a] (-> (Binary a) a Blob))
(let [[valueS valueT] ((get@ #write format) value)]
(|> valueS blob.create (valueT +0))))
## Primitives
(do-template [<name> <size> <read> <write>]
[(def: <name>
(Binary (I64 Any))
{#read (function (_ [offset blob])
(case (<read> offset blob)
(#error.Success data)
(#error.Success [(n/+ <size> offset) blob] data)
(#error.Error error)
(#error.Error error)))
#write (function (_ value)
[<size>
(function (_ offset blob)
(|> blob
(<write> offset value)
error.assume))])})]
[bits/8 size/8 blob.read/8 blob.write/8]
[bits/16 size/16 blob.read/16 blob.write/16]
[bits/32 size/32 blob.read/32 blob.write/32]
[bits/64 size/64 blob.read/64 blob.write/64]
)
## Combinators
(def: #export (alt leftB rightB)
(All [l r] (-> (Binary l) (Binary r) (Binary (| l r))))
{#read (do p.Monad<Parser>
[flag (get@ #read bits/8)]
(case flag
+0 (:: @ map (|>> #.Left) (get@ #read leftB))
+1 (:: @ map (|>> #.Right) (get@ #read rightB))
_ (p.lift (ex.throw invalid-tag [+2 (.nat flag)]))))
#write (function (_ altV)
(case altV
(#.Left leftV)
(let [[leftS leftT] ((get@ #write leftB) leftV)]
[(.inc leftS)
(function (_ offset blob)
(|> blob
(blob.write/8 offset +0)
error.assume
(leftT (.inc offset))))])
(#.Right rightV)
(let [[rightS rightT] ((get@ #write rightB) rightV)]
[(.inc rightS)
(function (_ offset blob)
(|> blob
(blob.write/8 offset +1)
error.assume
(rightT (.inc offset))))])
))})
(def: #export (seq preB postB)
(All [a b] (-> (Binary a) (Binary b) (Binary [a b])))
{#read (p.seq (get@ #read preB) (get@ #read postB))
#write (function (_ [preV postV])
(let [[preS preT] ((get@ #write preB) preV)
[postS postT] ((get@ #write postB) postV)]
[(n/+ preS postS)
(function (_ offset)
(|>> (preT offset)
(postT (n/+ preS offset))))]))})
(def: #export (rec body)
(All [a] (-> (-> (Binary a) (Binary a)) (Binary a)))
{#read (function (_ input)
(let [read (get@ #read (body (rec body)))]
(read input)))
#write (function (_ value)
(let [write (get@ #write (body (rec body)))]
(write value)))})
## Utilities
(def: #export (ignore default)
(All [a] (-> a (Binary a)))
{#read (function (_ input)
(#error.Success [input default]))
#write (function (_ value)
[+0
(function (_ offset blob)
blob)])})
(def: #export any
(Binary Any)
(ignore []))
(def: #export bit
(Binary Bit)
{#read (function (_ [offset blob])
(case (blob.read/8 offset blob)
(#error.Success data)
(case (: Nat data)
(^template [<nat> <bit>]
<nat> (#error.Success [(inc offset) blob] <bit>))
([+0 #0]
[+1 #1])
_
(ex.throw invalid-tag [+2 data]))
(#error.Error error)
(#error.Error error)))
#write (function (_ value)
[+1
(function (_ offset blob)
(|> blob
(blob.write/8 offset (if value +1 +0))
error.assume))])})
(def: #export nat (Binary Nat) (:assume ..bits/64))
(def: #export int (Binary Int) (:assume ..bits/64))
(def: #export rev (Binary Rev) (:assume ..bits/64))
(def: #export frac
(Binary Frac)
(let [(^slots [#read #write]) ..bits/64]
{#read (:: p.Monad<Parser> map number.bits-to-frac read)
#write (|>> number.frac-to-bits write)}))
(def: #export blob
(Binary Blob)
{#read (do p.Monad<Parser>
[size (get@ #read nat)]
(function (_ [offset blob])
(do error.Monad<Error>
[#let [end (n/+ size offset)]
output (blob.slice offset end blob)]
(wrap [[end blob] output]))))
#write (function (_ value)
(let [size (blob.size value)]
[(n/+ size/64 size)
(function (_ offset blob)
(error.assume
(do error.Monad<Error>
[_ (blob.write/64 offset size blob)]
(blob.copy size +0 value (n/+ size/64 offset) blob))))]))})
(def: #export text
(Binary Text)
(let [(^slots [#read #write]) ..blob]
{#read (do p.Monad<Parser>
[utf8 read]
(p.lift (encoding.from-utf8 utf8)))
#write (|>> encoding.to-utf8 write)}))
(def: #export maybe
(All [a] (-> (Binary a) (Binary (Maybe a))))
(..alt ..any))
(def: #export (list value)
(All [a] (-> (Binary a) (Binary (List a))))
(..rec
(function (_ recur)
(..alt ..any
(..seq value recur)))))
(def: #export ident
(Binary Ident)
(..seq ..text ..text))
(def: #export type
(Binary Type)
(..rec
(function (_ type)
(let [pair (..seq type type)
indexed ..nat
quantified (..seq (..list type) type)]
($_ ..alt
## #Primitive
(..seq ..text (..list type))
## #Sum
pair
## #Product
pair
## #Function
pair
## #Parameter
indexed
## #Var
indexed
## #Ex
indexed
## #UnivQ
quantified
## #ExQ
quantified
## #Apply
pair
## #Named
(..seq ..ident type)
)))))
(def: #export cursor
(Binary Cursor)
($_ ..seq ..text ..nat ..nat))
(def: #export code
(Binary Code)
(..rec
(function (_ code)
(let [sequence (..list code)
code' ($_ ..alt
## #Bit
..bit
## #Nat
..nat
## #Int
..int
## #Rev
..rev
## #Frac
..frac
## #Text
..text
## #Symbol
..ident
## #Tag
..ident
## #Form
sequence
## #Tuple
sequence
## #Record
(..list (..seq code code)))]
(..seq ..cursor code')))))
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