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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 [js #+ JS Expression Statement])))
[//]
(// [".T" runtime]
[".T" primitive]
[".T" reference]))
(def: #export (translate-let translate register valueS bodyS)
(-> (-> ls.Synthesis (Meta Expression)) Nat ls.Synthesis ls.Synthesis
(Meta Expression))
(do macro.Monad<Meta>
[valueJS (translate valueS)
bodyJS (translate bodyS)]
(wrap (format "(function() {"
"var " (referenceT.variable register) " = " valueJS ";"
"return " bodyJS ";"
"})()"))))
(def: #export (translate-record-get translate valueS path)
(-> (-> ls.Synthesis (Meta Expression)) ls.Synthesis (List [Nat Bool])
(Meta Expression))
(do macro.Monad<Meta>
[valueJS (translate valueS)]
(wrap (list/fold (function (_ [idx tail?] source)
(let [method (if tail? runtimeT.product//right runtimeT.product//left)]
(format method "(" source "," (|> idx .int %i) ")")))
(format "(" valueJS ")")
path))))
(def: #export (translate-if testJS thenJS elseJS)
(-> Expression Expression Expression
Expression)
(format "(" testJS " ? " thenJS " : " elseJS ")"))
(def: savepoint
Expression
"pm_cursor_savepoint")
(def: cursor
Expression
"pm_cursor")
(def: (push-cursor value)
(-> Expression Expression)
(format cursor ".push(" value ");"))
(def: save-cursor
Statement
(format savepoint ".push(" cursor ".slice());"))
(def: restore-cursor
Statement
(format cursor " = " savepoint ".pop();"))
(def: peek-cursor
Expression
(format cursor "[" cursor ".length - 1]"))
(def: pop-cursor
Statement
(format cursor ".pop();"))
(def: pm-error
Expression
(%t "PM-ERROR"))
(def: fail-pattern-matching
Statement
(format "throw " 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>
[bodyJS (translate bodyS)]
(wrap (format "return " bodyJS ";")))
(^code ("lux case pop"))
(meta/wrap pop-cursor)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (format "var " (referenceT.variable register) " = " peek-cursor ";"))
(^template [<tag> <translate>]
[_ (<tag> value)]
(do macro.Monad<Meta>
[valueJS (<translate> value)]
(wrap (format "if(!" (format runtimeT.int//= "(" peek-cursor "," valueJS ")") ") { " fail-pattern-matching " }"))))
([#.Nat primitiveT.translate-nat]
[#.Int primitiveT.translate-int]
[#.Rev primitiveT.translate-rev])
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (format "if(" peek-cursor " !== " (<format> value) ") { " fail-pattern-matching " }")))
([#.Bool %b]
[#.Frac %f]
[#.Text %t])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor (format <getter> "(" peek-cursor "," (|> idx .int %i) ")"))))
(["lux case tuple left" runtimeT.product//left]
["lux case tuple right" runtimeT.product//right])
(^template [<pm> <flag>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (format "temp = " runtimeT.sum//get "(" peek-cursor "," (|> idx .int %i) "," <flag> ");"
"if(temp == null) {"
fail-pattern-matching
"}"
"else {"
(push-cursor "temp")
"}")))
(["lux case variant left" "null"]
["lux case variant right" "\"\""])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftJS (translate-pattern-matching' translate leftP)
rightJS (translate-pattern-matching' translate rightP)]
(wrap (format leftJS rightJS)))
(^code ("lux case alt" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftJS (translate-pattern-matching' translate leftP)
rightJS (translate-pattern-matching' translate rightP)]
(wrap (format "try {"
save-cursor
leftJS
"}"
"catch(ex) {"
"if(ex === " pm-error ") {"
restore-cursor
rightJS
"}"
"else {"
"throw ex;"
"}"
"}")))
_
(lang.throw Unrecognized-Path (%code path))
))
(def: report-pattern-matching-error
Statement
(format "if(ex === " pm-error ") {"
"throw \"Invalid expression for pattern-matching.\";"
"}"
"else {"
"throw ex;"
"}"))
(def: (translate-pattern-matching translate path)
(-> (-> ls.Synthesis (Meta Expression)) Code (Meta Expression))
(do macro.Monad<Meta>
[pmJS (translate-pattern-matching' translate path)]
(wrap (format "try {" pmJS "}"
"catch(ex) {"
report-pattern-matching-error
"}"))))
(def: (initialize-pattern-matching stack-init)
(-> Expression Statement)
(format "var temp;"
"var " cursor " = [" stack-init "];"
"var " savepoint " = [];"))
(def: #export (translate-case translate valueS path)
(-> (-> ls.Synthesis (Meta Expression)) ls.Synthesis Code (Meta Expression))
(do macro.Monad<Meta>
[valueJS (translate valueS)
pmJS (translate-pattern-matching translate path)]
(wrap (format "(function() {"
"\"use strict\";"
(initialize-pattern-matching valueJS)
pmJS
"})()"))))
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