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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:])
(data text/format
(coll [list "list/" Fold<List>]))
[macro #+ "meta/" Monad<Meta>])
(luxc [lang]
(lang ["ls" synthesis]
(host [ruby #+ Ruby Expression Statement])))
[//]
(// [".T" runtime]
[".T" primitive]
[".T" reference]))
(def: (expression-block body)
(-> Statement Expression)
(ruby.call (list)
(ruby.lambda #.None (list)
body)))
(def: #export (translate-let translate register valueS bodyS)
(-> (-> ls.Synthesis (Meta Expression)) Nat ls.Synthesis ls.Synthesis
(Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
bodyO (translate bodyS)]
(wrap (expression-block
(ruby.block! (list (ruby.set! (list (referenceT.variable register)) valueO)
(ruby.return! bodyO)))))))
(def: #export (translate-record-get translate valueS path)
(-> (-> ls.Synthesis (Meta Expression)) ls.Synthesis (List [Nat Bit])
(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 (ruby.int (:coerce Int idx)))))
valueO
path))))
(def: #export (translate-if testO thenO elseO)
(-> Expression Expression Expression Expression)
(expression-block
(ruby.if! testO
(ruby.return! thenO)
(ruby.return! elseO))))
(def: savepoint
Expression
"pm_cursor_savepoint")
(def: cursor
Expression
"pm_cursor")
(def: (push-cursor! value)
(-> Expression Statement)
(ruby.statement (ruby.send "push" (list value) cursor)))
(def: save-cursor!
Statement
(ruby.statement
(ruby.send "push"
(list (ruby.array-range (ruby.int 0) (ruby.int -1) cursor))
savepoint)))
(def: restore-cursor!
Statement
(ruby.set! (list cursor) (ruby.send "pop" (list) savepoint)))
(def: cursor-top
Expression
(ruby.nth (ruby.- (ruby.int 1)
(ruby.length cursor))
cursor))
(def: pop-cursor!
Statement
(ruby.statement (ruby.send "pop" (list) cursor)))
(def: pm-error
Expression
(ruby.string "PM-ERROR"))
(exception: #export (Unrecognized-Path {message Text})
message)
(def: (translate-pattern-matching' translate path)
(-> (-> ls.Synthesis (Meta Expression)) Code (Meta Expression))
(case path
(^code ("lux case exec" (~ bodyS)))
(do macro.Monad<Meta>
[bodyO (translate bodyS)]
(wrap (ruby.return! bodyO)))
(^code ("lux case pop"))
(meta/wrap pop-cursor!)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (ruby.set! (list (referenceT.variable register)) cursor-top))
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (ruby.when! (ruby.not (ruby.= (|> value <format>) cursor-top))
(ruby.raise pm-error))))
([#.Int ruby.int]
[#.Bit ruby.bool]
[#.Frac ruby.float]
[#.Text ruby.string])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor! (<getter> cursor-top (ruby.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 (ruby.block! (list (ruby.set! (list "temp") (runtimeT.sum//get cursor-top (ruby.int (:coerce Int idx)) <flag>))
(ruby.if! (ruby.= ruby.nil "temp")
(ruby.raise pm-error)
(push-cursor! "temp"))))))
(["lux case variant left" ruby.nil]
["lux case variant right" (ruby.string "")])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (ruby.block! (list 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 (ruby.begin! (ruby.block! (list save-cursor!
leftO))
(list [(list) "alt_error" (ruby.if! (ruby.= pm-error (ruby.field "message" "alt_error"))
(ruby.block! (list restore-cursor!
rightO))
(ruby.raise "alt_error"))]))))
_
(lang.throw Unrecognized-Path (%code path))
))
(def: (translate-pattern-matching translate path)
(-> (-> ls.Synthesis (Meta Expression)) Code (Meta Expression))
(do macro.Monad<Meta>
[pattern-matching (translate-pattern-matching' translate path)]
(wrap (ruby.begin! pattern-matching
(list [(list) "alt_error"
(ruby.if! (ruby.= pm-error (ruby.field "message" "alt_error"))
(ruby.raise (ruby.string "Invalid expression for pattern-matching."))
(ruby.raise "alt_error"))])))))
(def: (initialize-pattern-matching stack-init)
(-> Expression Statement)
(ruby.block! (list (ruby.set! (list cursor) (ruby.array (list stack-init)))
(ruby.set! (list savepoint) (ruby.array (list))))))
(def: #export (translate-case translate valueS path)
(-> (-> ls.Synthesis (Meta Expression)) ls.Synthesis Code (Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
pattern-matching (translate-pattern-matching translate path)]
(wrap (expression-block
(ruby.block! (list (initialize-pattern-matching valueO)
pattern-matching))))))
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