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(.module:
[lux (#- case let if)
[control
[monad (#+ do)]
["ex" exception (#+ exception:)]]
[data
[number]
["." text
format]
[collection
[list ("list/" Functor<List> Fold<List>)]
[set (#+ Set)]]]]
[/////
[reference (#+ Register)]
[host ["_" scheme (#+ Expression Computation Var)]]
[compiler ("operation/" Monad<Operation>)
[synthesis (#+ Synthesis Path)]]]
[//runtime (#+ Operation Compiler)]
[//reference])
(def: #export (let translate [valueS register bodyS])
(-> Compiler [Synthesis Register Synthesis]
(Operation Computation))
(do compiler.Monad<Operation>
[valueO (translate valueS)
bodyO (translate bodyS)]
(wrap (_.let (list [(//reference.local' register) valueO])
bodyO))))
(def: #export (record-get translate valueS pathP)
(-> Compiler Synthesis (List [Nat Bit])
(Operation Expression))
(do compiler.Monad<Operation>
[valueO (translate valueS)]
(wrap (list/fold (function (_ [idx tail?] source)
(.let [method (.if tail?
//runtime.product//right
//runtime.product//left)]
(method source (_.int (:coerce Int idx)))))
valueO
pathP))))
(def: #export (if translate [testS thenS elseS])
(-> Compiler [Synthesis Synthesis Synthesis]
(Operation Computation))
(do compiler.Monad<Operation>
[testO (translate testS)
thenO (translate thenS)
elseO (translate elseS)]
(wrap (_.if testO thenO elseO))))
(def: @savepoint (_.var "lux_pm_cursor_savepoint"))
(def: @cursor (_.var "lux_pm_cursor"))
(def: top _.length/1)
(def: (push! value var)
(-> Expression Var Computation)
(_.set! var (_.cons/2 value var)))
(def: (pop! var)
(-> Var Computation)
(_.set! var var))
(def: (push-cursor! value)
(-> Expression Computation)
(push! value @cursor))
(def: save-cursor!
Computation
(push! @cursor @savepoint))
(def: restore-cursor!
Computation
(_.set! @cursor (_.car/1 @savepoint)))
(def: cursor-top
Computation
(_.car/1 @cursor))
(def: pop-cursor!
Computation
(pop! @cursor))
(def: pm-error (_.string "PM-ERROR"))
(def: fail-pm! (_.raise/1 pm-error))
(def: @temp (_.var "lux_pm_temp"))
(exception: #export (unrecognized-path)
"")
(def: $alt_error (_.var "alt_error"))
(def: (pm-catch handler)
(-> Expression Computation)
(_.lambda [(list $alt_error) #.None]
(_.if (|> $alt_error (_.eqv?/2 pm-error))
handler
(_.raise/1 $alt_error))))
(def: (pattern-matching' translate pathP)
(-> Compiler Path (Operation Expression))
(.case pathP
(^ (synthesis.path/then bodyS))
(translate bodyS)
#synthesis.Pop
(operation/wrap pop-cursor!)
(#synthesis.Bind register)
(operation/wrap (_.define (//reference.local' register) [(list) #.None]
cursor-top))
(^template [<tag> <format> <=>]
(^ (<tag> value))
(operation/wrap (_.when (|> value <format> (<=> cursor-top) _.not/1)
fail-pm!)))
([synthesis.path/bit _.bool _.eqv?/2]
[synthesis.path/i64 _.int _.=/2]
[synthesis.path/f64 _.float _.=/2]
[synthesis.path/text _.string _.eqv?/2])
(^template [<pm> <flag> <prep>]
(^ (<pm> idx))
(operation/wrap (_.let (list [@temp (|> idx <prep> .int _.int (//runtime.sum//get cursor-top <flag>))])
(_.if (_.null?/1 @temp)
fail-pm!
(push-cursor! @temp)))))
([synthesis.side/left _.nil (<|)]
[synthesis.side/right (_.string "") inc])
(^template [<pm> <getter> <prep>]
(^ (<pm> idx))
(operation/wrap (|> idx <prep> .int _.int (<getter> cursor-top) push-cursor!)))
([synthesis.member/left //runtime.product//left (<|)]
[synthesis.member/right //runtime.product//right inc])
(^template [<tag> <computation>]
(^ (<tag> [leftP rightP]))
(do compiler.Monad<Operation>
[leftO (pattern-matching' translate leftP)
rightO (pattern-matching' translate rightP)]
(wrap <computation>)))
([synthesis.path/seq (_.begin (list leftO
rightO))]
[synthesis.path/alt (_.with-exception-handler
(pm-catch (_.begin (list restore-cursor!
rightO)))
(_.lambda [(list) #.None]
(_.begin (list save-cursor!
leftO))))])
_
(compiler.throw unrecognized-path [])))
(def: (pattern-matching translate pathP)
(-> Compiler Path (Operation Computation))
(do compiler.Monad<Operation>
[pattern-matching! (pattern-matching' translate pathP)]
(wrap (_.with-exception-handler
(pm-catch (_.raise/1 (_.string "Invalid expression for pattern-matching.")))
(_.lambda [(list) #.None]
pattern-matching!)))))
(def: #export (case translate [valueS pathP])
(-> Compiler [Synthesis Path] (Operation Computation))
(do compiler.Monad<Operation>
[valueO (translate valueS)]
(<| (:: @ map (_.let (list [@cursor (_.list/* (list valueO))]
[@savepoint (_.list/* (list))])))
(pattern-matching translate pathP))))
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