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(.module:
[library
[lux "*"
[abstract
[apply {"+" [Apply]}]
[equivalence {"+" [Equivalence]}]
["[0]" functor {"+" [Functor]}]
["[0]" monad {"+" [Monad do]}]]
[meta
["[0]" location]]]])
(type: .public (Try a)
(Variant
{#Failure Text}
{#Success a}))
(implementation: .public functor
(Functor Try)
(def: (each f ma)
(case ma
{#Failure msg}
{#Failure msg}
{#Success datum}
{#Success (f datum)})))
(implementation: .public apply
(Apply Try)
(def: &functor ..functor)
(def: (on fa ff)
(case ff
{#Success f}
(case fa
{#Success a}
{#Success (f a)}
{#Failure msg}
{#Failure msg})
{#Failure msg}
{#Failure msg})))
(implementation: .public monad
(Monad Try)
(def: &functor ..functor)
(def: (in a)
{#Success a})
(def: (conjoint mma)
(case mma
{#Failure msg}
{#Failure msg}
{#Success ma}
ma)))
(implementation: .public (with monad)
... TODO: Replace (All (_ a) (! (Try a))) with (functor.Then ! Try)
(All (_ !) (-> (Monad !) (Monad (All (_ a) (! (Try a))))))
(def: &functor
(functor.composite (value@ monad.&functor monad)
..functor))
(def: in
(|>> (# ..monad in)
(# monad in)))
(def: (conjoint MeMea)
(do monad
[eMea MeMea]
(case eMea
{#Failure try}
(in {#Failure try})
{#Success Mea}
Mea))))
(def: .public (lifted monad)
(All (_ ! a) (-> (Monad !) (-> (! a) (! (Try a)))))
(# monad each (# ..monad in)))
(implementation: .public (equivalence (^open "_#[0]"))
(All (_ a) (-> (Equivalence a) (Equivalence (Try a))))
(def: (= reference sample)
(case [reference sample]
[{#Success reference} {#Success sample}]
(_#= reference sample)
[{#Failure reference} {#Failure sample}]
("lux text =" reference sample)
_
false
)))
(def: .public (trusted try)
(All (_ a)
(-> (Try a) a))
(case try
{#Success value}
value
{#Failure message}
(panic! message)))
(def: .public (maybe try)
(All (_ a)
(-> (Try a) (Maybe a)))
(case try
{#Success value}
{.#Some value}
{#Failure message}
{.#None}))
(def: .public (of_maybe maybe)
(All (_ a)
(-> (Maybe a) (Try a)))
(case maybe
{.#Some value}
{#Success value}
{.#None}
{#Failure (`` (("lux in-module" (~~ (static .prelude_module)) .name#encoded)
(name_of ..of_maybe)))}))
(macro: .public (else tokens compiler)
(case tokens
(^ (list else try))
{#Success [compiler (list (` (case (~ try)
{..#Success (~' g!temp)}
(~' g!temp)
{..#Failure (~ [location.dummy {.#Identifier ["" ""]}])}
(~ else))))]}
_
{#Failure "Wrong syntax for else"}))
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