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|
(.module:
[library
[lux {"-" Module}
[abstract
[monad {"+" do}]]
[control
["[0]" try {"+" Try}]
["[0]" exception {"+" exception:}]
["<>" parser
[binary {"+" Parser}]]]
[data
[collection
["[0]" dictionary {"+" Dictionary}]]
[format
["[0]" binary {"+" Writer}]]]
[type {"+" :sharing}
abstract]]]
[//
["[0]" signature {"+" Signature}]
["[0]" 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))))
)
|
