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(.module:
[library
[lux #*
[ffi (#+ import:)]
["@" target]
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
["." io (#+ IO io)]
[concurrency
["." async (#+ Async)]
["." atom]]]
[data
["." text (#+ Char)
["%" format (#+ format)]]]]])
(interface: .public (Console !)
{#.doc (example "An interface to console/terminal I/O.")}
(: (-> [] (! (Try Char)))
read)
(: (-> [] (! (Try Text)))
read_line)
(: (-> Text (! (Try Any)))
write)
(: (-> [] (! (Try Any)))
close))
(def: .public (async console)
(-> (Console IO) (Console Async))
(`` (implementation
(~~ (template [<capability>]
[(def: <capability>
(|>> (\ console <capability>) async.future))]
[read]
[read_line]
[write]
[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)])
(template [<name>]
[(exception: .public (<name>)
"")]
[cannot_open]
[cannot_close]
)
(def: .public default
(IO (Try (Console IO)))
(do io.monad
[?jvm_console (java/lang/System::console)]
(case ?jvm_console
#.None
(in (exception.except ..cannot_open []))
(#.Some jvm_console)
(let [jvm_input (java/lang/System::in)
jvm_output (java/lang/System::out)]
(<| in
#try.Success
(: (Console IO)) ... TODO: Remove ASAP
(implementation
(def: (read _)
(|> jvm_input
java/io/InputStream::read
(\ (try.with io.monad) map .nat)))
(def: (read_line _)
(java/io/Console::readLine jvm_console))
(def: (write message)
(java/io/PrintStream::print message jvm_output))
(def: close
(|>> (exception.except ..cannot_close) in)))))))))]
(for {@.old (as_is <jvm>)
@.jvm (as_is <jvm>)}
(as_is)))
(def: .public (write_line message console)
{#.doc (example "Writes the message on the console and appends a new-line/line-feed at the end.")}
(All [!] (-> Text (Console !) (! (Try Any))))
(\ console write (format message text.new_line)))
(interface: .public (Mock s)
{#.doc (example "A mock/simulation of a console."
"Useful for testing.")}
(: (-> 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: .public (mock mock init)
(All [s] (-> (Mock s) s (Console IO)))
(let [state (atom.atom init)]
(`` (implementation
(~~ (template [<method> <mock>]
[(def: (<method> _)
(do {! io.monad}
[|state| (atom.read! state)]
(case (\ mock <mock> |state|)
(#try.Success [|state| output])
(do !
[_ (atom.write! |state| state)]
(in (#try.Success output)))
(#try.Failure error)
(in (#try.Failure error)))))]
[read on_read]
[read_line on_read_line]
))
(def: (write input)
(do {! io.monad}
[|state| (atom.read! state)]
(case (\ mock on_write input |state|)
(#try.Success |state|)
(do !
[_ (atom.write! |state| state)]
(in (#try.Success [])))
(#try.Failure error)
(in (#try.Failure error)))))
(def: (close _)
(do {! io.monad}
[|state| (atom.read! state)]
(case (\ mock on_close |state|)
(#try.Success |state|)
(do !
[_ (atom.write! |state| state)]
(in (#try.Success [])))
(#try.Failure error)
(in (#try.Failure error)))))
))))
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