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|
(.module:
[lux #- open]
(lux (control [monad #+ do])
(data ["e" error]
[text])
(concurrency [promise]
[task #+ Task])
(type (object interface))
[io #+ IO Process io]
[host]))
(interface: #export Console
(read-char [] (Task Text))
(read-line [] (Task Text))
(write [Text] (Task Any))
(close [] (Task Any)))
(for {"JVM"
(as-is (host.import java/io/InputStream
(read [] #io #try int)
(available [] #io #try int)
(mark [int] #io #try void)
(reset [] #io #try void))
(host.import java/io/Reader)
(host.import java/io/PrintStream
(print [String] #io #try void))
(host.import java/lang/System
(#static in java/io/InputStream)
(#static out java/io/PrintStream))
(host.import java/lang/Appendable
(append [CharSequence] Appendable))
(host.import java/lang/String)
(host.import java/lang/StringBuffer
(new [String])
(toString [] String))
(class: JVM-Console Console
{#input InputStream
#output PrintStream}
(def: read-char
(|>> get@Console
(get@ #input)
(InputStream::read [])
(:: io.Functor<Process> map (|>> .nat text.from-code))
promise.future))
(def: (read-line console)
(let [input (|> console get@Console (get@ #input))
buffer (StringBuffer::new [""])]
(promise.future
(loop [_ []]
(do io.Monad<Process>
[char (<| (:: @ map (|>> .nat text.from-code))
(InputStream::read [] input))]
(case char
"\n"
(wrap (StringBuffer::toString [] buffer))
"\r"
(do @
[available (InputStream::available [] input)]
(if (i/> 0 available)
(do @
[_ (InputStream::mark [10] input)
next (<| (:: @ map (|>> .nat text.from-code))
(InputStream::read [] input))]
(case next
"\n"
(wrap (StringBuffer::toString [] buffer))
_
(do @
[_ (InputStream::reset [] input)]
(wrap (StringBuffer::toString [] buffer)))))
(wrap (StringBuffer::toString [] buffer))))
_
(exec (Appendable::append [(:! String char)] buffer)
(recur []))))))))
(def: (write message)
(|>> get@Console
(get@ #output)
(PrintStream::print [message])
promise.future))
(def: (close self)
(task.return [])))
(def: #export open
(Process Console)
(io (#e.Success (new@JVM-Console {#input System::in
#output System::out})))))
})
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