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(.module:
[lux (#- case let if)
[control
[monad (#+ do)]
["ex" exception (#+ exception:)]]
[data
["." number]
["." text
format]
[collection
["." list ("#;." functor fold)]]]
[host
["_" scheme (#+ Expression Computation Var)]]]
["." // #_
["#." runtime (#+ Operation Phase)]
["#." primitive]
["#/" // #_
["#." reference]
["#/" // ("#;." monad)
["#/" // #_
[reference (#+ Register)]
["#." synthesis (#+ Synthesis Path)]]]]])
(def: #export register
(///reference.local _.var))
(def: #export (let generate [valueS register bodyS])
(-> Phase [Synthesis Register Synthesis]
(Operation Computation))
(do ////.monad
[valueO (generate valueS)
bodyO (generate bodyS)]
(wrap (_.let (list [(..register register) valueO])
bodyO))))
(def: #export (record-get generate valueS pathP)
(-> Phase Synthesis (List [Nat Bit])
(Operation Expression))
(do ////.monad
[valueO (generate valueS)]
(wrap (list;fold (function (_ [idx tail?] source)
(.let [method (.if tail?
//runtime.product//right
//runtime.product//left)]
(method source (_.int (.int idx)))))
valueO
pathP))))
(def: #export (if generate [testS thenS elseS])
(-> Phase [Synthesis Synthesis Synthesis]
(Operation Computation))
(do ////.monad
[testO (generate testS)
thenO (generate thenS)
elseO (generate elseS)]
(wrap (_.if testO thenO elseO))))
(def: @savepoint (_.var "lux_pm_cursor_savepoint"))
(def: @cursor (_.var "lux_pm_cursor"))
(def: @temp (_.var "lux_pm_temp"))
(def: @alt-error (_.var "alt_error"))
(def: (push! value var)
(-> Expression Var Computation)
(_.set! var (_.cons/2 value var)))
(def: (push-cursor! value)
(-> Expression Computation)
(push! value @cursor))
(def: (pop! var)
(-> Var Computation)
(_.set! var var))
(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))
(exception: #export unrecognized-path)
(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' generate pathP)
(-> Phase Path (Operation Expression))
(.case pathP
(^ (/////synthesis.path/then bodyS))
(generate bodyS)
#/////synthesis.Pop
(////;wrap pop-cursor!)
(#/////synthesis.Bind register)
(////;wrap (_.define (..register register) [(list) #.None]
cursor-top))
(^template [<tag> <format> <=>]
(^ (<tag> value))
(////;wrap (_.when (|> value <format> (<=> cursor-top) _.not/1)
fail-pm!)))
([/////synthesis.path/bit //primitive.bit _.eqv?/2]
[/////synthesis.path/i64 (<| //primitive.i64 .int) _.=/2]
[/////synthesis.path/f64 //primitive.f64 _.=/2]
[/////synthesis.path/text //primitive.text _.eqv?/2])
(^template [<pm> <flag> <prep>]
(^ (<pm> idx))
(////;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))
(////;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 ////.monad
[leftO (pattern-matching' generate leftP)
rightO (pattern-matching' generate 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))))])
_
(////.throw unrecognized-path [])))
(def: (pattern-matching generate pathP)
(-> Phase Path (Operation Computation))
(do ////.monad
[pattern-matching! (pattern-matching' generate pathP)]
(wrap (_.with-exception-handler
(pm-catch (_.raise/1 (_.string "Invalid expression for pattern-matching.")))
(_.lambda [(list) #.None]
pattern-matching!)))))
(def: #export (case generate [valueS pathP])
(-> Phase [Synthesis Path] (Operation Computation))
(do ////.monad
[valueO (generate valueS)]
(<| (:: @ map (_.let (list [@cursor (_.list/* (list valueO))]
[@savepoint (_.list/* (list))])))
(pattern-matching generate pathP))))
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