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⎕session←{
(indented main prompt)←⍵
⎕rawio←'Welcome to APL9',(⎕ucs 10),prompt
indented←≢prompt
unindent←{
⎕rawio←⎕ucs ⍺⍴8
}
handleMain←{
0::⍺
(shy data)←⍵
_←{
⎕rawio←data
⎕rawio←⎕ucs 10
} IF ~shy
⎕rawio←prompt
≢prompt
}
handleError←{
0::⍺
(task (error msg taskname))←⍵
⎕rawio←error,' in [',(⍕task),':',taskname,']'
_←{⎕rawio←': ', msg} IF msg≢''
⎕rawio←⎕ucs 10
⎕rawio←prompt
≢prompt
}
handleQuad←{
0::⍺
data←⍵
⎕rawio←data
⎕rawio←⎕ucs 10
0
}
handleQuoteQuad←{
0::⍺
data←⍵
⎕rawio←data
⍺
}
handle←{
0::⍺
(task (type data))←⍵
indented←⍺
_←indented∘unindent IF (indented>0)∧task≢main
indented←indented×task≡main
type≡'→': indented handleMain data
type≡'!': indented handleError task data
type≡'⎕': indented handleQuad data
type≡'⍞': indented handleQuoteQuad data
⍵
}
{∇ ⍵ handle {1 ⍵}⍇⍬} indented
}&'session'⊢0 ⎕self (6⍴' ')
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