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|
(.module:
{#.doc "Codecs for values in the JSON format."}
[library
[lux #*
["." debug]
[abstract
[monad (#+ do)]
["." codec]]
[control
["." try]
["<>" parser
["<.>" type]
["</>" json]]]
[data
["." text
["%" format (#+ format)]]
[collection
["." list ("#\." monad)]
["." row (#+ row)]
["." dictionary]]]
[macro
[syntax (#+ syntax:)]
["." code]
["." poly (#+ poly:)]]
[math
[number
["n" nat ("#\." decimal)]
["." i64]
["." int]
["." frac]]]
[time
## ["." instant]
## ["." duration]
["." date]
["." day]
["." month]]
["." type
["." unit]]]]
[\\library
["." / (#+ JSON)]])
(def: tag
(-> Nat Frac)
(|>> .int int.frac))
(def: (rec_encode non_rec)
(All [a] (-> (-> (-> a JSON)
(-> a JSON))
(-> a JSON)))
(function (_ input)
(non_rec (rec_encode non_rec) input)))
(def: low_mask Nat (|> 1 (i64.left_shifted 32) dec))
(def: high_mask Nat (|> low_mask (i64.left_shifted 32)))
(implementation: nat_codec
(codec.Codec JSON Nat)
(def: (encode input)
(let [high (|> input (i64.and high_mask) (i64.right_shifted 32))
low (i64.and low_mask input)]
(#/.Array (row (|> high .int int.frac #/.Number)
(|> low .int int.frac #/.Number)))))
(def: decode
(</>.run (</>.array
(do <>.monad
[high </>.number
low </>.number]
(in (n.+ (|> high frac.int .nat (i64.left_shifted 32))
(|> low frac.int .nat))))))))
(implementation: int_codec
(codec.Codec JSON Int)
(def: encode (|>> .nat (\ nat_codec encode)))
(def: decode
(|>> (\ nat_codec decode) (\ try.functor map .int))))
(def: (nullable writer)
{#.doc "Builds a JSON generator for potentially inexistent values."}
(All [a] (-> (-> a JSON) (-> (Maybe a) JSON)))
(function (_ elem)
(case elem
#.None #/.Null
(#.Some value) (writer value))))
(implementation: qty_codec
(All [unit]
(codec.Codec JSON (unit.Qty unit)))
(def: encode
(|>> ((debug.private unit.out))
(\ ..int_codec encode)))
(def: decode
(|>> (\ ..int_codec decode)
(\ try.functor map (debug.private unit.in)))))
(poly: encode
(with_expansions
[<basic> (template [<matcher> <encoder>]
[(do !
[.let [g!_ (code.local_identifier "_______")]
_ <matcher>]
(in (` (: (~ (@JSON\encode inputT))
<encoder>))))]
[(<type>.exactly Any) (function ((~ g!_) (~ (code.identifier ["" "0"]))) #/.Null)]
[(<type>.sub Bit) (|>> #/.Boolean)]
[(<type>.sub Nat) (\ (~! ..nat_codec) (~' encode))]
[(<type>.sub Int) (\ (~! ..int_codec) (~' encode))]
[(<type>.sub Frac) (|>> #/.Number)]
[(<type>.sub Text) (|>> #/.String)])
<time> (template [<type> <codec>]
[(do !
[_ (<type>.exactly <type>)]
(in (` (: (~ (@JSON\encode inputT))
(|>> (\ (~! <codec>) (~' encode)) #/.String)))))]
## [duration.Duration duration.codec]
## [instant.Instant instant.codec]
[date.Date date.codec]
[day.Day day.codec]
[month.Month month.codec])]
(do {! <>.monad}
[*env* <type>.env
.let [@JSON\encode (: (-> Type Code)
(function (_ type)
(` (-> (~ (poly.code *env* type)) /.JSON))))]
inputT <type>.peek]
($_ <>.either
<basic>
<time>
(do !
[unitT (<type>.applied (<>.after (<type>.exactly unit.Qty)
<type>.any))]
(in (` (: (~ (@JSON\encode inputT))
(\ (~! qty_codec) (~' encode))))))
(do !
[.let [g!_ (code.local_identifier "_______")
g!key (code.local_identifier "_______key")
g!val (code.local_identifier "_______val")]
[_ _ =val=] (<type>.applied ($_ <>.and
(<type>.exactly dictionary.Dictionary)
(<type>.exactly .Text)
encode))]
(in (` (: (~ (@JSON\encode inputT))
(|>> ((~! dictionary.entries))
((~! list\map) (function ((~ g!_) [(~ g!key) (~ g!val)])
[(~ g!key) ((~ =val=) (~ g!val))]))
((~! dictionary.of_list) (~! text.hash))
#/.Object)))))
(do !
[[_ =sub=] (<type>.applied ($_ <>.and
(<type>.exactly .Maybe)
encode))]
(in (` (: (~ (@JSON\encode inputT))
((~! ..nullable) (~ =sub=))))))
(do !
[[_ =sub=] (<type>.applied ($_ <>.and
(<type>.exactly .List)
encode))]
(in (` (: (~ (@JSON\encode inputT))
(|>> ((~! list\map) (~ =sub=)) ((~! row.of_list)) #/.Array)))))
(do !
[.let [g!_ (code.local_identifier "_______")
g!input (code.local_identifier "_______input")]
members (<type>.variant (<>.many encode))
.let [last (dec (list.size members))]]
(in (` (: (~ (@JSON\encode inputT))
(function ((~ g!_) (~ g!input))
(case (~ g!input)
(~+ (list\join (list\map (function (_ [tag g!encode])
(if (n.= last tag)
(.list (` ((~ (code.nat (dec tag))) #1 (~ g!input)))
(` ((~! /.json) [(~ (code.frac (..tag (dec tag))))
#1
((~ g!encode) (~ g!input))])))
(.list (` ((~ (code.nat tag)) #0 (~ g!input)))
(` ((~! /.json) [(~ (code.frac (..tag tag)))
#0
((~ g!encode) (~ g!input))])))))
(list.enumeration members))))))))))
(do !
[g!encoders (<type>.tuple (<>.many encode))
.let [g!_ (code.local_identifier "_______")
g!members (|> (list.size g!encoders)
list.indices
(list\map (|>> n\encode code.local_identifier)))]]
(in (` (: (~ (@JSON\encode inputT))
(function ((~ g!_) [(~+ g!members)])
((~! /.json) [(~+ (list\map (function (_ [g!member g!encode])
(` ((~ g!encode) (~ g!member))))
(list.zipped/2 g!members g!encoders)))]))))))
## Type recursion
(do !
[[selfC non_recC] (<type>.recursive encode)
.let [g! (code.local_identifier "____________")]]
(in (` (: (~ (@JSON\encode inputT))
((~! ..rec_encode) (.function ((~ g!) (~ selfC))
(~ non_recC)))))))
<type>.recursive_self
## Type applications
(do !
[partsC (<type>.applied (<>.many encode))]
(in (` ((~+ partsC)))))
## Polymorphism
(do !
[[funcC varsC bodyC] (<type>.polymorphic encode)]
(in (` (: (All [(~+ varsC)]
(-> (~+ (list\map (function (_ varC) (` (-> (~ varC) /.JSON)))
varsC))
(-> ((~ (poly.code *env* inputT)) (~+ varsC))
/.JSON)))
(function ((~ funcC) (~+ varsC))
(~ bodyC))))))
<type>.parameter
<type>.recursive_call
## If all else fails...
(<>.failure (format "Cannot create JSON encoder for: " (type.format inputT)))
))))
(poly: decode
(with_expansions
[<basic> (template [<matcher> <decoder>]
[(do !
[_ <matcher>]
(in (` (: (~ (@JSON\decode inputT))
(~! <decoder>)))))]
[(<type>.exactly Any) </>.null]
[(<type>.sub Bit) </>.boolean]
[(<type>.sub Nat) (<>.codec ..nat_codec </>.any)]
[(<type>.sub Int) (<>.codec ..int_codec </>.any)]
[(<type>.sub Frac) </>.number]
[(<type>.sub Text) </>.string])
<time> (template [<type> <codec>]
[(do !
[_ (<type>.exactly <type>)]
(in (` (: (~ (@JSON\decode inputT))
((~! <>.codec) (~! <codec>) (~! </>.string))))))]
## [duration.Duration duration.codec]
## [instant.Instant instant.codec]
[date.Date date.codec]
[day.Day day.codec]
[month.Month month.codec])]
(do {! <>.monad}
[*env* <type>.env
.let [@JSON\decode (: (-> Type Code)
(function (_ type)
(` (</>.Parser (~ (poly.code *env* type))))))]
inputT <type>.peek]
($_ <>.either
<basic>
<time>
(do !
[unitT (<type>.applied (<>.after (<type>.exactly unit.Qty)
<type>.any))]
(in (` (: (~ (@JSON\decode inputT))
((~! <>.codec) (~! qty_codec) (~! </>.any))))))
(do !
[[_ _ valC] (<type>.applied ($_ <>.and
(<type>.exactly dictionary.Dictionary)
(<type>.exactly .Text)
decode))]
(in (` (: (~ (@JSON\decode inputT))
((~! </>.dictionary) (~ valC))))))
(do !
[[_ subC] (<type>.applied (<>.and (<type>.exactly .Maybe)
decode))]
(in (` (: (~ (@JSON\decode inputT))
((~! </>.nullable) (~ subC))))))
(do !
[[_ subC] (<type>.applied (<>.and (<type>.exactly .List)
decode))]
(in (` (: (~ (@JSON\decode inputT))
((~! </>.array) ((~! <>.some) (~ subC)))))))
(do !
[members (<type>.variant (<>.many decode))
.let [last (dec (list.size members))]]
(in (` (: (~ (@JSON\decode inputT))
($_ ((~! <>.or))
(~+ (list\map (function (_ [tag memberC])
(if (n.= last tag)
(` (|> (~ memberC)
((~! <>.after) ((~! </>.boolean!) (~ (code.bit #1))))
((~! <>.after) ((~! </>.number!) (~ (code.frac (..tag (dec tag))))))
((~! </>.array))))
(` (|> (~ memberC)
((~! <>.after) ((~! </>.boolean!) (~ (code.bit #0))))
((~! <>.after) ((~! </>.number!) (~ (code.frac (..tag tag)))))
((~! </>.array))))))
(list.enumeration members))))))))
(do !
[g!decoders (<type>.tuple (<>.many decode))]
(in (` (: (~ (@JSON\decode inputT))
((~! </>.array) ($_ ((~! <>.and)) (~+ g!decoders)))))))
## Type recursion
(do !
[[selfC bodyC] (<type>.recursive decode)
.let [g! (code.local_identifier "____________")]]
(in (` (: (~ (@JSON\decode inputT))
((~! <>.rec) (.function ((~ g!) (~ selfC))
(~ bodyC)))))))
<type>.recursive_self
## Type applications
(do !
[[funcC argsC] (<type>.applied (<>.and decode (<>.many decode)))]
(in (` ((~ funcC) (~+ argsC)))))
## Polymorphism
(do !
[[funcC varsC bodyC] (<type>.polymorphic decode)]
(in (` (: (All [(~+ varsC)]
(-> (~+ (list\map (|>> (~) </>.Parser (`)) varsC))
(</>.Parser ((~ (poly.code *env* inputT)) (~+ varsC)))))
(function ((~ funcC) (~+ varsC))
(~ bodyC))))))
<type>.parameter
<type>.recursive_call
## If all else fails...
(<>.failure (format "Cannot create JSON decoder for: " (type.format inputT)))
))))
(syntax: #export (codec inputT)
{#.doc (doc "A macro for automatically producing JSON codecs."
(type: Variant
(#Bit Bit)
(#Text Text)
(#Frac Frac))
(type: Record
{#bit Bit
#frac Frac
#text Text
#maybe (Maybe Frac)
#list (List Frac)
#variant Variant
#tuple [Bit Frac Text]
#dictionary (Dictionary Text Frac)})
(derived: (..codec Record)))}
(in (.list (` (: (codec.Codec /.JSON (~ inputT))
(implementation
(def: (~' encode)
((~! ..encode) (~ inputT)))
(def: (~' decode)
((~! </>.run) ((~! ..decode) (~ inputT))))
))))))
|
