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|
(.module:
[library
[lux {"-" [Module]}
[abstract
[monad {"+" [do]}]]
[control
["." try {"+" [Try]}]
["." exception {"+" [exception:]}]
["<>" parser
[binary {"+" [Parser]}]]]
[data
[collection
["." dictionary {"+" [Dictionary]}]]
[format
["." binary {"+" [Writer]}]]]
[type {"+" [:sharing]}
abstract]]]
[//
["." signature {"+" [Signature]}]
["." key {"+" [Key]}]
[descriptor {"+" [Module]}]])
(exception: .public (invalid_signature {expected Signature} {actual Signature})
(exception.report
["Expected" (signature.description expected)]
["Actual" (signature.description actual)]))
(abstract: .public (Document d)
{}
(Record
[#signature Signature
#content d])
(def: .public (read key document)
(All (_ d) (-> (Key d) (Document Any) (Try d)))
(let [[document//signature document//content] (:representation document)]
(if (\ signature.equivalence =
(key.signature key)
document//signature)
(#try.Success (:sharing [e]
(Key e)
key
e
(:expected document//content)))
(exception.except ..invalid_signature [(key.signature key)
document//signature]))))
(def: .public (write key content)
(All (_ d) (-> (Key d) d (Document d)))
(:abstraction [#signature (key.signature key)
#content content]))
(def: .public (check key document)
(All (_ d) (-> (Key d) (Document Any) (Try (Document d))))
(do try.monad
[_ (..read key document)]
(in (:expected document))))
(def: .public signature
(-> (Document Any) Signature)
(|>> :representation (value@ #signature)))
(def: .public (writer content)
(All (_ d) (-> (Writer d) (Writer (Document d))))
(let [writer (binary.and signature.writer
content)]
(|>> :representation writer)))
(def: .public parser
(All (_ d) (-> (Parser d) (Parser (Document d))))
(|>> (<>.and signature.parser)
(\ <>.monad each (|>> :abstraction))))
)
|
