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(.module:
[lux (#- and or nat int rev list type)
[type (#+ :share)]
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]]
[data
["." binary (#+ Binary)]
[number
["." frac]]
[text
["." encoding]
["%" format]]
[collection
["." row (#+ Row)]]]]
["." // ("#@." monad)])
(type: #export Offset Nat)
(type: #export Parser
(//.Parser [Offset Binary]))
(exception: #export (binary-was-not-fully-read {length Nat} {read Nat})
(exception.report
["Binary length" (%.nat length)]
["Read bytes" (%.nat read)]))
(def: #export (run parser input)
(All [a] (-> (Parser a) Binary (Try a)))
(case (parser [0 input])
(#try.Failure msg)
(#try.Failure msg)
(#try.Success [[end _] output])
(let [length (binary.size input)]
(if (n/= end length)
(#try.Success output)
(exception.throw ..binary-was-not-fully-read [length end])))))
(type: #export Size Nat)
(def: #export size/8 Size 1)
(def: #export size/16 Size 2)
(def: #export size/32 Size 4)
(def: #export size/64 Size 8)
(template [<name> <size> <read>]
[(def: #export <name>
(Parser I64)
(function (_ [offset binary])
(case (<read> offset binary)
(#try.Success data)
(#try.Success [(n/+ <size> offset) binary] data)
(#try.Failure error)
(#try.Failure error))))]
[bits/8 ..size/8 binary.read/8]
[bits/16 ..size/16 binary.read/16]
[bits/32 ..size/32 binary.read/32]
[bits/64 ..size/64 binary.read/64]
)
(template [<name> <type>]
[(def: #export <name> (Parser <type>) ..bits/64)]
[nat Nat]
[int Int]
[rev Rev]
)
(def: #export frac
(Parser Frac)
(//@map frac.from-bits ..bits/64))
(exception: #export (invalid-tag {range Nat} {byte Nat})
(exception.report
["Range" (%.nat range)]
["Byte" (%.nat byte)]))
(def: #export (or left right)
(All [l r] (-> (Parser l) (Parser r) (Parser (| l r))))
(do //.monad
[flag ..nat]
(case flag
0 (:: @ map (|>> #.Left) left)
1 (:: @ map (|>> #.Right) right)
_ (//.lift (exception.throw ..invalid-tag [2 flag])))))
(def: #export (rec body)
(All [a] (-> (-> (Parser a) (Parser a)) (Parser a)))
(function (_ input)
(let [parser (body (rec body))]
(parser input))))
(def: #export any
(Parser Any)
(//@wrap []))
(def: #export bit
(Parser Bit)
(do //.monad
[choice (..or ..any ..any)]
(wrap (case choice
(#.Left _) #0
(#.Right _) #1))))
(template [<name> <bits> <size>]
[(def: #export <name>
(Parser Binary)
(do //.monad
[size (//@map .nat <bits>)]
(function (_ [offset binary])
(do try.monad
[#let [end (n/+ size offset)]
output (binary.slice offset (.dec end) binary)]
(wrap [[end binary] output])))))]
[binary/8 ..bits/8 ..size/8]
[binary/16 ..bits/16 ..size/16]
[binary/32 ..bits/32 ..size/32]
[binary/64 ..bits/64 ..size/64]
)
(template [<name> <binary>]
[(def: #export <name>
(Parser Text)
(do //.monad
[utf8 <binary>]
(//.lift (encoding.from-utf8 utf8))))]
[utf8/8 ..binary/8]
[utf8/16 ..binary/16]
[utf8/32 ..binary/32]
[utf8/64 ..binary/64]
)
(def: #export text ..utf8/64)
(template [<name> <bits> <size>]
[(def: #export (<name> valueP)
(All [v] (-> (Parser v) (Parser (Row v))))
(do //.monad
[count (//@map .nat <bits>)]
(loop [index 0
output (:share [v]
{(Parser v)
valueP}
{(Row v)
row.empty})]
(if (n/< count index)
(do //.monad
[value valueP]
(recur (.inc index)
(row.add value output)))
(//@wrap output)))))]
[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
(All [a] (-> (Parser a) (Parser (Maybe a))))
(..or ..any))
(def: #export (list value)
(All [a] (-> (Parser a) (Parser (List a))))
(..rec
(function (_ recur)
(..or ..any
(//.and value recur)))))
(def: #export name
(Parser Name)
(//.and ..text ..text))
(def: #export type
(Parser Type)
(..rec
(function (_ type)
(let [pair (//.and type type)
indexed ..nat
quantified (//.and (..list type) type)]
($_ ..or
## #Primitive
(//.and ..text (..list type))
## #Sum
pair
## #Product
pair
## #Function
pair
## #Parameter
indexed
## #Var
indexed
## #Ex
indexed
## #UnivQ
quantified
## #ExQ
quantified
## #Apply
pair
## #Named
(//.and ..name type)
)))))
(def: #export cursor
(Parser Cursor)
($_ //.and ..text ..nat ..nat))
(def: #export code
(Parser Code)
(..rec
(function (_ code)
(let [sequence (..list code)
code' ($_ ..or
## #Bit
..bit
## #Nat
..nat
## #Int
..int
## #Rev
..rev
## #Frac
..frac
## #Text
..text
## #Identifier
..name
## #Tag
..name
## #Form
sequence
## #Tuple
sequence
## #Record
(..list (//.and code code)))]
(//.and ..cursor code')))))
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