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(.module:
[lux #*
[host (#+ import:)]
["@" target]
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
["." io (#+ IO io)]
[concurrency
["." promise (#+ Promise)]
["." stm]]
[security
["!" capability (#+ capability:)]]]
[data
["." text (#+ Char)
["%" format (#+ format)]]]])
(template [<name>]
[(exception: #export (<name>)
"")]
[cannot-open]
[cannot-close]
)
(capability: #export (Can-Read ! o)
(can-read [] (! (Try o))))
(capability: #export (Can-Write ! i)
(can-write i (! (Try Any))))
(capability: #export (Can-Close !)
(can-close [] (! (Try Any))))
(signature: #export (Console !)
(: (Can-Read ! Char)
read)
(: (Can-Read ! Text)
read-line)
(: (Can-Write ! Text)
write)
(: (Can-Close !)
close))
(def: #export (async console)
(-> (Console IO) (Console Promise))
(`` (structure (~~ (template [<capability> <forge>]
[(def: <capability>
(<forge>
(|>> (!.use (:: console <capability>)) promise.future)))]
[read ..can-read]
[read-line ..can-read]
[write ..can-write]
[close ..can-close])))))
(with-expansions [<jvm> (as-is (import: java/lang/String)
(import: java/io/Console
(readLine [] #io #try java/lang/String))
(import: java/io/InputStream
(read [] #io #try int))
(import: java/io/PrintStream
(print [java/lang/String] #io #try void))
(import: java/lang/System
(#static console [] #io #? java/io/Console)
(#static in java/io/InputStream)
(#static out java/io/PrintStream))
(def: #export default
(IO (Try (Console IO)))
(do io.monad
[?jvm-console (java/lang/System::console)]
(case ?jvm-console
#.None
(wrap (exception.throw ..cannot-open []))
(#.Some jvm-console)
(let [jvm-input (java/lang/System::in)
jvm-output (java/lang/System::out)]
(<| wrap
exception.return
(: (Console IO)) ## TODO: Remove ASAP
(structure
(def: read
(..can-read
(function (_ _)
(|> jvm-input
java/io/InputStream::read
(:: (try.with io.monad) map .nat)))))
(def: read-line
(..can-read
(function (_ _)
(java/io/Console::readLine jvm-console))))
(def: write
(..can-write
(function (_ message)
(java/io/PrintStream::print message jvm-output))))
(def: close
(..can-close
(|>> (exception.throw ..cannot-close) wrap))))))))))]
(for {@.old (as-is <jvm>)
@.jvm (as-is <jvm>)}))
(def: #export (write-line message console)
(All [!] (-> Text (Console !) (! Any)))
(!.use (:: console write) (format message text.new-line)))
(signature: #export (Simulation s)
(: (-> s (Try [s Char]))
on-read)
(: (-> s (Try [s Text]))
on-read-line)
(: (-> Text s (Try s))
on-write)
(: (-> s (Try s))
on-close))
(def: #export (mock simulation init)
(All [s] (-> (Simulation s) s (Console Promise)))
(let [state (stm.var init)]
(`` (structure
(~~ (template [<method> <simulation>]
[(def: <method>
(..can-read
(function (_ _)
(stm.commit
(do {! stm.monad}
[|state| (stm.read state)]
(case (:: simulation <simulation> |state|)
(#try.Success [|state| output])
(do !
[_ (stm.write |state| state)]
(wrap (#try.Success output)))
(#try.Failure error)
(wrap (#try.Failure error))))))))]
[read on-read]
[read-line on-read-line]
))
(def: write
(..can-write
(function (_ input)
(stm.commit
(do {! stm.monad}
[|state| (stm.read state)]
(case (:: simulation on-write input |state|)
(#try.Success |state|)
(do !
[_ (stm.write |state| state)]
(wrap (#try.Success [])))
(#try.Failure error)
(wrap (#try.Failure error))))))))
(def: close
(..can-close
(function (_ _)
(stm.commit
(do {! stm.monad}
[|state| (stm.read state)]
(case (:: simulation on-close |state|)
(#try.Success |state|)
(do !
[_ (stm.write |state| state)]
(wrap (#try.Success [])))
(#try.Failure error)
(wrap (#try.Failure error))))))))
))))
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