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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
(.require
[library
[lux (.except with when)
[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)
(.when 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)
(.when ff
{#Success f}
(.when 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)
(.when 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
(|>> (of ..monad in)
(of monad in)))
(def (conjoint MeMea)
(do monad
[eMea MeMea]
(.when eMea
{#Success Mea}
Mea
... {#Failure error}
it
(in (as_expected it)))))))
(def .public (lifted monad)
(All (_ ! a) (-> (Monad !) (-> (! a) (! (Try a)))))
(of monad each (of ..monad in)))
(def .public (equivalence (open "_#[0]"))
(All (_ a) (-> (Equivalence a) (Equivalence (Try a))))
(implementation
(def (= reference sample)
(.when [reference sample]
[{#Success reference} {#Success sample}]
(_#= reference sample)
[{#Failure reference} {#Failure sample}]
(.text_=# reference sample)
_
false
))))
(def .public (trusted try)
(All (_ a)
(-> (Try a) a))
(.when try
{#Success value}
value
{#Failure message}
(panic! message)))
(def .public (maybe try)
(All (_ a)
(-> (Try a) (Maybe a)))
(.when try
{#Success value}
{.#Some value}
... {#Failure message}
_
{.#None}))
(def .public (of_maybe maybe)
(All (_ a)
(-> (Maybe a) (Try a)))
(.when maybe
{.#Some value}
{#Success value}
{.#None}
{#Failure (`` ((.in_module# (,, (static .prelude)) .symbol#encoded) (symbol ..of_maybe)))}))
(def generated_symbol
(macro (_ tokens compiler)
(.when tokens
(list [_ {.#Text prefix}])
(let [generated_symbol (`` (.in_module# (,, (static .prelude)) .generated_symbol))]
(.when (generated_symbol prefix compiler)
{#Success [compiler g!_]}
{#Success [compiler (list g!_)]}
{#Failure error}
{#Failure error}))
_
(undefined))))
(def .public else
(with_expansions [g!then (generated_symbol "g!then")
g!failure (generated_symbol "g!failure")]
(template (_ <else> <try>)
[(.when <try>
{..#Success g!then}
g!then
... {..#Failure g!failure}
g!failure
<else>)])))
(def .public when
(template (_ <test> <then>)
[(if <test>
<then>
{..#Failure (let [symbol#encoded (`` (.in_module# (,, (static .prelude)) .symbol#encoded))]
(.text_composite# "[" (symbol#encoded (symbol ..when)) "]"
" " "Invalid condition!"))})]))
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