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(.require
[library
[lux (.except with)
["@" target]
[abstract
[apply (.only Apply)]
[equivalence (.only Equivalence)]
["[0]" functor (.only Functor)]
["[0]" monad (.only Monad do)]]
[meta
["[0]" location]]]])
(type .public (Try a)
(Variant
{#Failure Text}
{#Success a}))
(def .public functor
(Functor Try)
(implementation
(def (each f ma)
(case ma
{#Success datum}
{#Success (f datum)}
... {#Failure msg}
it
(as_expected it)))))
(def .public apply
(Apply Try)
(implementation
(def functor ..functor)
(def (on fa ff)
(case ff
{#Success f}
(case fa
{#Success a}
{#Success (f a)}
... {#Failure msg}
it
(as_expected it))
... {#Failure msg}
it
(as_expected it)))))
(def .public monad
(Monad Try)
(implementation
(def functor ..functor)
(def (in a)
{#Success a})
(def (conjoint mma)
(case mma
{#Success ma}
ma
... {#Failure msg}
it
(as_expected it)))))
(def .public (with monad)
... TODO: Replace (All (_ a) (! (Try a))) with (functor.Then ! Try)
(All (_ !) (-> (Monad !) (Monad (All (_ a) (! (Try a))))))
(implementation
(def functor
(functor.composite (the monad.functor monad)
..functor))
(def in
(|>> (at ..monad in)
(at monad in)))
(def (conjoint MeMea)
(do monad
[eMea MeMea]
(case eMea
{#Success Mea}
Mea
... {#Failure error}
it
(in (as_expected it)))))))
(def .public (lifted monad)
(All (_ ! a) (-> (Monad !) (-> (! a) (! (Try a)))))
(at monad each (at ..monad in)))
(def .public (equivalence (open "_#[0]"))
(All (_ a) (-> (Equivalence a) (Equivalence (Try a))))
(implementation
(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)) .symbol#encoded)
(symbol ..of_maybe)))}))
(def .public else
(macro (_ tokens compiler)
(case tokens
(pattern (list else try))
{#Success [compiler (list (` (case (~ try)
{..#Success (~' g!temp)}
(~' g!temp)
... {..#Failure (~' g!temp)}
(~' g!temp)
(~ else))))]}
_
{#Failure "Wrong syntax for 'else'"})))
(def .public when
(macro (_ tokens state)
(case tokens
(pattern (.list test then))
(let [code#encoded ("lux in-module" "library/lux" .code#encoded)
text$ ("lux in-module" "library/lux" .text$)]
{.#Right [state (.list (` (.if (~ test)
(~ then)
{..#Failure (~ (text$ (all "lux text concat"
"[" (code#encoded (` .when)) "]"
" " "Invalid condition:")))})))]})
_
{.#Left "Wrong syntax for 'when'"})))
|
