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(.using
[library
[lux (.full)
[abstract
[monad (.only do)]]
[control
["[0]" try (.only Try)]
["[0]" exception (.only exception:)]
["<>" parser
[binary (.only Parser)]]]
[data
[collection
["[0]" dictionary (.only Dictionary)]]
[format
["[0]" binary (.only Writer)]]]
[type (.only sharing)
[primitive (.full)]]]]
[///
["[0]" signature (.only Signature) ("[1]#[0]" equivalence)]
["[0]" key (.only Key)]])
(exception: .public (invalid_signature [expected Signature
actual Signature])
(exception.report
"Expected" (signature.description expected)
"Actual" (signature.description actual)))
(primitive: .public (Document d)
(Record
[#signature Signature
#content d])
(def: .public (content 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
(as_expected document//content))}
(exception.except ..invalid_signature [(key.signature key)
document//signature]))))
(def: .public (document key content)
(All (_ d) (-> (Key d) d (Document d)))
(abstraction [#signature (key.signature key)
#content content]))
(def: .public (marked? key document)
(All (_ d) (-> (Key d) (Document Any) (Try (Document d))))
(do try.monad
[_ (..content key document)]
(in (as_expected document))))
(def: .public signature
(-> (Document Any) Signature)
(|>> representation (the #signature)))
(def: .public (writer content)
(All (_ d) (-> (Writer d) (Writer (Document d))))
(let [writer (all binary.and
signature.writer
content)]
(|>> representation writer)))
(def: .public (parser key it)
(All (_ d) (-> (Key d) (Parser d) (Parser (Document d))))
(do <>.monad
[actual signature.parser
.let [expected (key.signature key)]
_ (if (signature#= expected actual)
(in [])
(<>.lifted (exception.except ..invalid_signature [expected actual])))
it it]
(in (abstraction [actual it]))))
)
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