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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 ["_" php #+ Expression Statement Except Var])))
[//]
(// [".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
(list (_.set!' @register valueO))
_.array/*
(_.nth (_.int 1))))))
(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 (_.int (:coerce Int idx)))))
valueO
pathP))))
(def: #export (translate-if testO thenO elseO)
(-> Expression Expression Expression Expression)
(_.? testO thenO elseO))
(def: @savepoint (_.var "pm_cursor_savepoint"))
(def: @cursor (_.var "pm_cursor"))
(def: (push-cursor! value)
(-> Expression Statement)
(_.do! (_.array-push/2 @cursor value)))
(def: save-cursor!
Statement
(_.do! (_.array-push/2 @savepoint (_.array-slice/2 @cursor (_.int 0)))))
(def: restore-cursor!
Statement
(_.set! @cursor (_.array-pop/1 @savepoint)))
(def: cursor-top
Expression
(_.nth (|> @cursor _.count/1 (_.- (_.int 1)))
@cursor))
(def: pop-cursor!
Statement
(_.do! (_.array-pop/1 @cursor)))
(def: pm-error (_.string "PM-ERROR"))
(def: php-exception (_.global "Exception"))
(def: (new-Exception error)
(-> Expression Expression)
(_.new php-exception (list error)))
(def: fail-pm! (_.throw! (new-Exception pm-error)))
(def: @temp (_.var "temp"))
(exception: #export (Unrecognized-Path {message Text})
message)
(def: @alt-error (_.var "alt_error"))
(def: (pm-catch! handler!)
(-> Statement Except)
{#_.class php-exception
#_.exception @alt-error
#_.handler (_.if! (|> @alt-error (_.send "getMessage" (list)) (_.= pm-error))
handler!
(_.throw! @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 (_.return! bodyO)))
(^code ("lux case pop"))
(meta/wrap pop-cursor!)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (_.set! (referenceT.variable register) cursor-top))
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (_.when! (_.not (_.= (|> value <format>) cursor-top))
fail-pm!)))
([#.Int _.int]
[#.Bool _.bool]
[#.Frac _.float]
[#.Text _.string])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor! (<getter> cursor-top (_.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 (|> (_.set! @temp (runtimeT.sum//get cursor-top (_.int (:coerce Int idx)) <flag>))
(_.then! (_.if! (_.is-null/1 @temp)
fail-pm!
(push-cursor! @temp))))))
(["lux case variant left" _.null]
["lux case variant right" (_.string "")])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (|> leftO
(_.then! rightO))))
(^code ("lux case alt" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (_.try! (|> save-cursor!
(_.then! leftO))
(list (pm-catch!
(|> restore-cursor!
(_.then! 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 (_.try! pattern-matching
(list (pm-catch!
(_.throw! (new-Exception (_.string "Invalid expression for pattern-matching.")))))))))
(def: (initialize-pattern-matching! stack-init)
(-> Expression Statement)
(|> (_.set! @cursor (_.array/* (list stack-init)))
(_.then! (_.set! @savepoint (_.array/* (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 Text))
(|>> macro.gensym
(:: macro.Monad<Meta> map (|>> %code lang.normalize-name))))
(def: #export (translate-case translate valueS pathP)
(-> (-> Synthesis (Meta Expression)) Synthesis Path (Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
@case (:: @ map _.global (generated-name "case"))
@value (:: @ map _.var (generated-name "value"))
#let [@dependencies+ (|> (path-variables pathP)
(get@ #dependencies)
set.to-list
(list/map referenceT.local))]
pattern-matching! (translate-pattern-matching translate pathP)
_ (//.save (_.function! @case (|> (list& @value @dependencies+)
(list/map _.parameter))
(|> (initialize-pattern-matching! @value)
(_.then! pattern-matching!))))]
(wrap (_.apply (list& valueO @dependencies+) @case))))
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