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(.module:
[lux (#- case let if)
[control
[monad (#+ do)]
["ex" exception (#+ exception:)]]
[data
["." number]
["." text
format]
[collection
["." list ("#/." functor fold)]]]
[host
["_" js (#+ Expression Computation Var Statement)]]]
[//
["//." runtime (#+ Operation Phase)]
["//." reference]
["//." primitive]
[//
[common
["common-." reference]]
["//." // ("#/." monad)
[//
[reference (#+ Register)]
["." synthesis (#+ Synthesis Path)]]]]])
(def: #export register
(common-reference.local _.var))
(def: #export (let translate [valueS register bodyS])
(-> Phase [Synthesis Register Synthesis]
(Operation Computation))
(do ////.monad
[valueO (translate valueS)
bodyO (translate bodyS)]
(wrap (_.apply/* (<| (_.closure (list))
($_ _.then
(_.define (..register register) valueO)
(_.return bodyO)))
(list)))))
(def: #export (record-get translate valueS pathP)
(-> Phase Synthesis (List [Nat Bit])
(Operation Expression))
(do ////.monad
[valueO (translate valueS)]
(wrap (list/fold (function (_ [idx tail?] source)
(.let [method (.if tail?
//runtime.product//right
//runtime.product//left)]
(method source (_.i32 (.int idx)))))
valueO
pathP))))
(def: #export (if translate [testS thenS elseS])
(-> Phase [Synthesis Synthesis Synthesis]
(Operation Computation))
(do ////.monad
[testO (translate testS)
thenO (translate thenS)
elseO (translate elseS)]
(wrap (_.? testO thenO elseO))))
(def: @savepoint (_.var "lux_pm_cursor_savepoint"))
(def: @cursor (_.var "lux_pm_cursor"))
(def: @temp (_.var "lux_pm_temp"))
(def: @alt-error (_.var "alt_error"))
(def: (push-cursor! value)
(-> Expression Statement)
(_.statement (|> @cursor (_.do "push" (list value)))))
(def: pop-cursor!
Statement
(_.statement (|> @cursor (_.do "pop" (list)))))
(def: peek-cursor
Expression
(.let [idx (|> @cursor (_.the "length") (_.- (_.i32 +1)))]
(|> @cursor (_.at idx))))
(def: save-cursor!
Statement
(.let [cursor (|> @cursor (_.do "slice" (list)))]
(_.statement (|> @savepoint (_.do "push" (list cursor))))))
(def: restore-cursor!
Statement
(_.set @cursor (|> @savepoint (_.do "pop" (list)))))
(def: pm-error (_.string "PM-ERROR"))
(def: fail-pm! (_.throw pm-error))
(exception: #export unrecognized-path)
(def: (pm-catch on-catch!)
(-> Statement [Var Statement])
[@alt-error
(_.if (_.= ..pm-error @alt-error)
on-catch!
(_.throw @alt-error))])
(def: (pattern-matching' translate pathP)
(-> Phase Path (Operation Statement))
(.case pathP
(^ (synthesis.path/then bodyS))
(do ////.monad
[body! (translate bodyS)]
(wrap (_.return body!)))
#synthesis.Pop
(/////wrap pop-cursor!)
(#synthesis.Bind register)
(/////wrap (_.define (..register register) ..peek-cursor))
(^template [<tag> <format> <=>]
(^ (<tag> value))
(/////wrap (_.when (|> value <format> (<=> ..peek-cursor) _.not)
fail-pm!)))
([synthesis.path/bit //primitive.bit _.=]
[synthesis.path/i64 (<| //primitive.i64 .int) //runtime.i64//=]
[synthesis.path/f64 //primitive.f64 _.=]
[synthesis.path/text //primitive.text _.=])
(^template [<pm> <flag> <prep>]
(^ (<pm> idx))
(/////wrap ($_ _.then
(_.set @temp (|> idx <prep> .int _.i32 (//runtime.sum//get ..peek-cursor <flag>)))
(_.if (_.= _.null @temp)
fail-pm!
(push-cursor! @temp)))))
([synthesis.side/left _.null (<|)]
[synthesis.side/right (_.string "") inc])
(^template [<pm> <getter> <prep>]
(^ (<pm> idx))
(/////wrap (|> idx <prep> .int _.i32 (<getter> ..peek-cursor) push-cursor!)))
([synthesis.member/left //runtime.product//left (<|)]
[synthesis.member/right //runtime.product//right inc])
(^template [<tag> <computation>]
(^ (<tag> leftP rightP))
(do ////.monad
[left! (pattern-matching' translate leftP)
right! (pattern-matching' translate rightP)]
(wrap <computation>)))
([synthesis.path/seq (_.then left! right!)]
[synthesis.path/alt (_.try ($_ _.then
..save-cursor!
left!)
(pm-catch ($_ _.then
..restore-cursor!
right!)))])
_
(////.throw unrecognized-path [])))
(def: (pattern-matching translate pathP)
(-> Phase Path (Operation Statement))
(do ////.monad
[pattern-matching! (pattern-matching' translate pathP)]
(wrap (_.try pattern-matching!
(pm-catch (_.throw (_.string "Invalid expression for pattern-matching.")))))))
(def: #export (case translate [valueS pathP])
(-> Phase [Synthesis Path] (Operation Computation))
(do ////.monad
[stack-init (translate valueS)
path! (pattern-matching translate pathP)
#let [closure (<| (_.closure (list))
($_ _.then
(_.declare @temp)
(_.define @cursor (_.array (list stack-init)))
(_.define @savepoint (_.array (list)))
path!))]]
(wrap (_.apply/* closure (list)))))
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