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|
(.module:
[lux #*
[control
[functor (#+ Functor)]
[apply (#+ Apply)]
[monad (#+ Monad)]]
[data
[error (#+ Error)]]
[type
abstract]])
(abstract: #export (Dirty a)
{#.doc (doc "A value which is considered untrustworthy due to its origin.")}
a
(def: #export taint
{#.doc (doc "Mark a value as dirty/untrustworthy.")}
(All [a] (-> a (Dirty a)))
(|>> :abstraction))
(def: #export (validate validator dirty)
{#.doc (doc "Test a dirty/untrustworthy value."
"Potentially produces a 'clean' value.")}
(All [a b] (-> (-> a (Error b)) (Dirty a) (Error b)))
(validator (:representation dirty)))
(def: #export trust
{#.doc (doc "Trusts a (previously thought as) dirty/untrustworthy value."
"Only use this function if you know what you are doing."
"Trusting a value that hasn't been validated opens a security vulnerability.")}
(All [a] (-> (Dirty a) a))
(|>> :representation))
(structure: #export _ (Functor Dirty)
(def: (map f fa)
(|> fa :representation f :abstraction)))
(structure: #export _ (Apply Dirty)
(def: functor Functor<Dirty>)
(def: (apply ff fa)
(:abstraction ((:representation ff) (:representation fa)))))
(structure: #export _ (Monad Dirty)
(def: functor Functor<Dirty>)
(def: wrap (|>> :abstraction))
(def: join (|>> :representation)))
)
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