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(;module: {#;doc "Functionality for generating and processing values in the JSON format.
For more information, please see: http://www.json.org/"}
lux
(lux (control functor
applicative
["M" monad #+ do Monad]
[eq #+ Eq]
codec
["p" parser "p/" Monad<Parser>])
(data [bool]
[text "text/" Eq<Text> Monoid<Text>]
(text ["l" lexer])
[number "real/" Codec<Text,Real> "nat/" Codec<Text,Nat>]
maybe
["R" result]
[sum]
[product]
(coll [list "L/" Fold<List> Monad<List>]
[vector #+ Vector vector "Vector/" Monad<Vector>]
["d" dict]))
[macro #+ Monad<Lux> with-gensyms]
(macro ["s" syntax #+ syntax:]
[code]
[poly #+ poly:])
[type]
))
## [Types]
(do-template [<name> <type>]
[(type: #export <name> <type>)]
[Null Unit]
[Boolean Bool]
[Number Real]
[String Text]
)
(type: #export #rec JSON
(#Null Null)
(#Boolean Boolean)
(#Number Number)
(#String String)
(#Array (Vector JSON))
(#Object (d;Dict String JSON)))
(do-template [<name> <type>]
[(type: #export <name> <type>)]
[Array (Vector JSON)]
[Object (d;Dict String JSON)]
)
(type: #export (Reader a)
{#;doc "JSON reader."}
(p;Parser (List JSON) a))
## [Syntax]
(syntax: #export (json token)
{#;doc (doc "A simple way to produce JSON literals."
(json true)
(json 123.456)
(json "Some text")
(json #null)
(json ["this" "is" "an" "array"])
(json {"this" "is"
"an" "object"}))}
(let [(^open) Monad<Lux>
wrapper (function [x] (` (;;json (~ x))))]
(case token
(^template [<ast-tag> <ctor> <json-tag>]
[_ (<ast-tag> value)]
(wrap (list (` (: JSON (<json-tag> (~ (<ctor> value))))))))
([#;Bool code;bool #Boolean]
[#;Real code;real #Number]
[#;Text code;text #String])
[_ (#;Tag ["" "null"])]
(wrap (list (` (: JSON #Null))))
[_ (#;Tuple members)]
(wrap (list (` (: JSON (#Array (vector (~@ (L/map wrapper members))))))))
[_ (#;Record pairs)]
(do Monad<Lux>
[pairs' (M;map @
(function [[slot value]]
(case slot
[_ (#;Text key-name)]
(wrap (` [(~ (code;text key-name)) (~ (wrapper value))]))
_
(macro;fail "Wrong syntax for JSON object.")))
pairs)]
(wrap (list (` (: JSON (#Object (d;from-list text;Hash<Text> (list (~@ pairs')))))))))
_
(wrap (list token))
)))
(def: #export null
{#;doc "The null JSON value."}
JSON
#Null)
(def: #export (fields json)
{#;doc "Get all the fields in a JSON object."}
(-> JSON (R;Result (List String)))
(case json
(#Object obj)
(#R;Success (d;keys obj))
_
(#R;Error ($_ text/append "Cannot get the fields of a non-object."))))
(def: #export (get key json)
{#;doc "A JSON object field getter."}
(-> String JSON (R;Result JSON))
(case json
(#Object obj)
(case (d;get key obj)
(#;Some value)
(#R;Success value)
#;None
(#R;Error ($_ text/append "Missing field \"" key "\" on object.")))
_
(#R;Error ($_ text/append "Cannot get field \"" key "\" of a non-object."))))
(def: #export (set key value json)
{#;doc "A JSON object field setter."}
(-> String JSON JSON (R;Result JSON))
(case json
(#Object obj)
(#R;Success (#Object (d;put key value obj)))
_
(#R;Error ($_ text/append "Cannot set field \"" key "\" of a non-object."))))
(do-template [<name> <tag> <type> <desc>]
[(def: #export (<name> key json)
{#;doc (#;TextA ($_ text/append "A JSON object field getter for " <desc> "."))}
(-> Text JSON (R;Result <type>))
(case (get key json)
(#R;Success (<tag> value))
(#R;Success value)
(#R;Success _)
(#R;Error ($_ text/append "Wrong value type at key: " key))
(#R;Error error)
(#R;Error error)))]
[get-boolean #Boolean Boolean "booleans"]
[get-number #Number Number "numbers"]
[get-string #String String "strings"]
[get-array #Array Array "arrays"]
[get-object #Object Object "objects"]
)
(do-template [<name> <type> <tag> <desc>]
[(def: #export (<name> value)
{#;doc (#;TextA ($_ text/append "A JSON generator for " <desc> "."))}
(-> <type> JSON)
(<tag> value))]
[boolean Boolean #Boolean "booleans"]
[number Number #Number "numbers"]
[string String #String "strings"]
[array Array #Array "arrays"]
[object Object #Object "objects"]
)
(def: #export (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))))
(struct: #export _ (Eq JSON)
(def: (= x y)
(case [x y]
[#Null #Null]
true
(^template [<tag> <struct>]
[(<tag> x') (<tag> y')]
(:: <struct> = x' y'))
([#Boolean bool;Eq<Bool>]
[#Number number;Eq<Real>]
[#String text;Eq<Text>])
[(#Array xs) (#Array ys)]
(and (n.= (vector;size xs) (vector;size ys))
(L/fold (function [idx prev]
(and prev
(default false
(do Monad<Maybe>
[x' (vector;nth idx xs)
y' (vector;nth idx ys)]
(wrap (= x' y'))))))
true
(list;indices (vector;size xs))))
[(#Object xs) (#Object ys)]
(and (n.= (d;size xs) (d;size ys))
(L/fold (function [[xk xv] prev]
(and prev
(case (d;get xk ys)
#;None false
(#;Some yv) (= xv yv))))
true
(d;entries xs)))
_
false)))
|
