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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 [python #+ Expression Statement Except 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 (|> bodyO
(python.lambda (list $register))
(python.apply (list valueO))))))
(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 (python.int (:coerce Int idx)))))
valueO
pathP))))
(def: #export (translate-if testO thenO elseO)
(-> Expression Expression Expression Expression)
(python.if testO thenO elseO))
(def: $savepoint (python.var "pm_cursor_savepoint"))
(def: $cursor (python.var "pm_cursor"))
(def: (push-cursor! value)
(-> Expression Statement)
(python.do!
(python.send (list value)
"append" (@@ $cursor))))
(def: save-cursor!
Statement
(python.do!
(python.send (list (python.slice-from (python.int 0) (@@ $cursor)))
"append" (@@ $savepoint))))
(def: restore-cursor!
Statement
(python.set! (list $cursor)
(python.send (list) "pop" (@@ $savepoint))))
(def: cursor-top
Expression
(python.nth (python.int -1) (@@ $cursor)))
(def: pop-cursor!
Statement
(python.do!
(python.send (list) "pop" (@@ $cursor))))
(def: pm-error (python.string "PM-ERROR"))
(def: (new-Exception error)
(-> Expression Expression)
(python.apply (list error) (python.global "Exception")))
(def: fail-pm! (python.raise! (new-Exception pm-error)))
(def: $temp (python.var "temp"))
(exception: #export (Unrecognized-Path {message Text})
message)
(def: $alt_error (python.var "alt_error"))
(def: (pm-catch! handler!)
(-> Statement Except)
[(list "Exception") $alt_error
(python.if! (python.= pm-error (python.apply (list (@@ $alt_error)) (python.global "str")))
handler!
(python.raise! (@@ $alt_error)))])
(def: (translate-pattern-matching' translate pathP)
(-> (-> Synthesis (Meta Expression)) Path (Meta Statement))
(case pathP
(^code ("lux case exec" (~ bodyS)))
(do macro.Monad<Meta>
[bodyO (translate bodyS)]
(wrap (python.return! bodyO)))
(^code ("lux case pop"))
(meta/wrap pop-cursor!)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (python.set! (list (referenceT.variable register)) cursor-top))
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (python.when! (python.not (python.= (|> value <format>) cursor-top))
fail-pm!)))
([#.Nat (<| python.int (:coerce Int))]
[#.Int python.int]
[#.Rev (<| python.int (:coerce Int))]
[#.Bool python.bool]
[#.Frac python.float]
[#.Text python.string])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor! (<getter> cursor-top (python.int (:coerce Int idx))))))
(["lux case tuple left" runtimeT.product//left]
["lux case tuple right" runtimeT.product//right])
(^template [<pm> <flag>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap ($_ python.then!
(python.set! (list $temp) (runtimeT.sum//get cursor-top (python.int (:coerce Int idx)) <flag>))
(python.if! (python.= python.none (@@ $temp))
fail-pm!
(push-cursor! (@@ $temp))))))
(["lux case variant left" python.none]
["lux case variant right" (python.string "")])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap ($_ python.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 (python.try! ($_ python.then!
save-cursor!
leftO)
(list (pm-catch!
($_ python.then!
restore-cursor!
rightO))))))
_
(lang.throw Unrecognized-Path (%code pathP))
))
(def: (translate-pattern-matching translate pathP)
(-> (-> Synthesis (Meta Expression)) Path (Meta Statement))
(do macro.Monad<Meta>
[pattern-matching (translate-pattern-matching' translate pathP)]
(wrap (python.try! pattern-matching
(list (pm-catch!
(python.raise! (new-Exception (python.string "Invalid expression for pattern-matching.")))))))))
(def: (initialize-pattern-matching! stack-init)
(-> Expression Statement)
($_ python.then!
(python.set! (list $cursor) (python.list (list stack-init)))
(python.set! (list $savepoint) (python.list (list)))))
(def: empty (Set Variable) (set.new number.Hash<Int>))
(type: Storage
{#bindings (Set Variable)
#dependencies (Set Variable)})
(def: (path-variables pathP)
(-> Path Storage)
(loop [pathP pathP
outer-variables {#bindings empty
#dependencies empty}]
## TODO: Remove (let [outer recur]) once loops can have names.
(let [outer recur]
(case pathP
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(update@ #bindings (set.add (.int register))
outer-variables)
(^or (^code ("lux case seq" (~ leftP) (~ rightP)))
(^code ("lux case alt" (~ leftP) (~ rightP))))
(list/fold outer outer-variables (list leftP rightP))
(^code ("lux case exec" (~ bodyS)))
(loop [bodyS bodyS
inner-variables outer-variables]
## TODO: Remove (let [inner recur]) once loops can have names.
(let [inner recur]
(case bodyS
(^code ((~ [_ (#.Nat tag)]) (~ [_ (#.Bool last?)]) (~ valueS)))
(inner valueS inner-variables)
(^code [(~+ members)])
(list/fold inner inner-variables members)
(^ [_ (#.Form (list [_ (#.Int var)]))])
(if (set.member? (get@ #bindings inner-variables) var)
inner-variables
(update@ #dependencies (set.add var) inner-variables))
(^code ("lux call" (~ functionS) (~+ argsS)))
(list/fold inner inner-variables (#.Cons functionS argsS))
(^code ("lux function" (~ [_ (#.Nat arity)]) [(~+ environment)] (~ bodyS)))
(|> environment
(list/map (|>> (list) code.form))
(list/fold inner inner-variables))
(^code ("lux let" (~ [_ (#.Nat register)]) (~ inputS) (~ exprS)))
(list/fold inner (update@ #bindings (set.add (.int register))
inner-variables)
(list inputS exprS))
(^code ("lux case" (~ inputS) (~ pathPS)))
(|> inner-variables (inner inputS) (outer pathPS))
(^code ((~ [_ (#.Text procedure)]) (~+ argsS)))
(list/fold inner inner-variables argsS)
_
inner-variables)))
_
outer-variables))))
(def: generated-name
(-> Text (Meta SVar))
(|>> macro.gensym
(:: macro.Monad<Meta> map (|>> %code
lang.normalize-name
python.var))))
(def: #export (translate-case translate valueS pathP)
(-> (-> Synthesis (Meta Expression)) Synthesis Path (Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
$case (generated-name "case")
$value (generated-name "value")
#let [$dependencies+ (|> (path-variables pathP)
(get@ #dependencies)
set.to-list
(list/map referenceT.local))
@dependencies+ (list/map @@ $dependencies+)]
pattern-matching! (translate-pattern-matching translate pathP)
_ (//.save (python.def! $case (list& $value $dependencies+)
($_ python.then!
(initialize-pattern-matching! (@@ $value))
pattern-matching!)))]
(wrap (python.apply (list& valueO @dependencies+) (@@ $case)))))
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