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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:])
(data [number]
[text]
text/format
(coll [list "list/" Functor<List> Fold<List>]
(set ["set" unordered #+ Set])))
[macro #+ "meta/" Monad<Meta>]
(macro [code]))
(luxc [lang]
(lang [".L" variable #+ Register Variable]
["ls" synthesis #+ Synthesis Path]
(host [r #+ Expression SVar @@])))
[//]
(// [".T" runtime]
[".T" primitive]
[".T" reference]))
(def: #export (translate-let translate register valueS bodyS)
(-> (-> Synthesis (Meta Expression)) Register Synthesis Synthesis
(Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
bodyO (translate bodyS)
#let [$register (referenceT.variable register)]]
(wrap (r.block
($_ r.then
(r.set! $register valueO)
bodyO)))))
(def: #export (translate-record-get translate valueS pathP)
(-> (-> Synthesis (Meta Expression)) Synthesis (List [Nat Bool])
(Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)]
(wrap (list/fold (function (_ [idx tail?] source)
(let [method (if tail?
runtimeT.product//right
runtimeT.product//left)]
(method source (r.int (:coerce Int idx)))))
valueO
pathP))))
(def: #export (translate-if testO thenO elseO)
(-> Expression Expression Expression Expression)
(r.if testO thenO elseO))
(def: $savepoint (r.var "lux_pm_cursor_savepoint"))
(def: $cursor (r.var "lux_pm_cursor"))
(def: top r.length)
(def: next (|>> r.length (r.+ (r.int 1))))
(def: (push! value var)
(-> Expression SVar Expression)
(r.set-nth! (next (@@ var)) value var))
(def: (pop! var)
(-> SVar Expression)
(r.set-nth! (top (@@ var)) r.null var))
(def: (push-cursor! value)
(-> Expression Expression)
(push! value $cursor))
(def: save-cursor!
Expression
(push! (r.slice (r.float 1.0) (r.length (@@ $cursor)) (@@ $cursor))
$savepoint))
(def: restore-cursor!
Expression
(r.set! $cursor (r.nth (top (@@ $savepoint)) (@@ $savepoint))))
(def: cursor-top
Expression
(|> (@@ $cursor) (r.nth (top (@@ $cursor)))))
(def: pop-cursor!
Expression
(pop! $cursor))
(def: pm-error (r.string "PM-ERROR"))
(def: fail-pm! (r.stop pm-error))
(def: $temp (r.var "lux_pm_temp"))
(exception: #export (Unrecognized-Path {message Text})
message)
(def: $alt_error (r.var "alt_error"))
(def: (pm-catch handler)
(-> Expression Expression)
(r.function (list $alt_error)
(r.if (|> (@@ $alt_error) (r.= pm-error))
handler
(r.stop (@@ $alt_error)))))
(def: (translate-pattern-matching' translate pathP)
(-> (-> Synthesis (Meta Expression)) Path (Meta Expression))
(case pathP
(^code ("lux case exec" (~ bodyS)))
(do macro.Monad<Meta>
[bodyO (translate bodyS)]
(wrap bodyO))
(^code ("lux case pop"))
(meta/wrap pop-cursor!)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (r.set! (referenceT.variable register) cursor-top))
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (r.when (r.not (r.= (|> value <format>) cursor-top))
fail-pm!)))
([#.Bool r.bool]
[#.Frac r.float]
[#.Text r.string])
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (r.when (r.not (runtimeT.int//= (|> value <format>) cursor-top))
fail-pm!)))
([#.Nat (<| runtimeT.int (:coerce Int))]
[#.Int runtimeT.int]
[#.Rev (<| runtimeT.int (:coerce Int))])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor! (<getter> cursor-top (r.int (:coerce Int idx))))))
(["lux case tuple left" runtimeT.product//left]
["lux case tuple right" runtimeT.product//right])
(^template [<pm> <flag>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap ($_ r.then
(r.set! $temp (runtimeT.sum//get cursor-top (r.int (:coerce Int idx)) <flag>))
(r.if (r.= r.null (@@ $temp))
fail-pm!
(push-cursor! (@@ $temp))))))
(["lux case variant left" r.null]
["lux case variant right" (r.string "")])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap ($_ r.then
leftO
rightO)))
(^code ("lux case alt" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (r.try ($_ r.then
save-cursor!
leftO)
#.None
(#.Some (pm-catch ($_ r.then
restore-cursor!
rightO)))
#.None)))
_
(lang.throw Unrecognized-Path (%code pathP))
))
(def: (translate-pattern-matching translate pathP)
(-> (-> Synthesis (Meta Expression)) Path (Meta Expression))
(do macro.Monad<Meta>
[pattern-matching! (translate-pattern-matching' translate pathP)]
(wrap (r.try pattern-matching!
#.None
(#.Some (pm-catch (r.stop (r.string "Invalid expression for pattern-matching."))))
#.None))))
(def: (initialize-pattern-matching! stack-init)
(-> Expression Expression)
($_ r.then
(r.set! $cursor (r.list (list stack-init)))
(r.set! $savepoint (r.list (list)))))
(def: #export (translate-case translate valueS pathP)
(-> (-> Synthesis (Meta Expression)) Synthesis Path (Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
pattern-matching! (translate-pattern-matching translate pathP)]
(wrap (r.block
($_ r.then
(initialize-pattern-matching! valueO)
pattern-matching!)))))
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