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(.module:
[lux (#- case let if)
[abstract
[monad (#+ do)]]
[control
["ex" exception (#+ exception:)]]
[data
["." text
format]
[collection
["." list ("#@." functor fold)]
["." set]]]
[target
["_" python (#+ Expression SVar Statement)]]]
["." // #_
["#." runtime (#+ Operation Phase)]
["#." reference]
["#." primitive]
["#/" //
["#." reference]
["#/" // ("#@." monad)
[synthesis
["." case]]
["#/" // #_
["." reference (#+ Register)]
["#." synthesis (#+ Synthesis Path)]]]]])
(def: #export register
(///reference.local _.var))
(def: #export capture
(///reference.foreign _.var))
(def: #export (let generate [valueS register bodyS])
(-> Phase [Synthesis Register Synthesis]
(Operation (Expression Any)))
(do ////.monad
[valueO (generate valueS)
bodyO (generate bodyS)]
## TODO: Find some way to do 'let' without paying the price of the closure.
(wrap (_.apply/* (_.lambda (list (..register register))
bodyO)
(list valueO)))))
(def: #export (record-get generate valueS pathP)
(-> Phase Synthesis (List (Either Nat Nat))
(Operation (Expression Any)))
(do ////.monad
[valueO (generate valueS)]
(wrap (list@fold (function (_ side source)
(.let [method (.case side
(^template [<side> <accessor>]
(<side> lefts)
(<accessor> (_.int (.int lefts))))
([#.Left //runtime.tuple//left]
[#.Right //runtime.tuple//right]))]
(method source)))
valueO
pathP))))
(def: #export (if generate [testS thenS elseS])
(-> Phase [Synthesis Synthesis Synthesis]
(Operation (Expression Any)))
(do ////.monad
[testO (generate testS)
thenO (generate thenS)
elseO (generate elseS)]
(wrap (_.? testO thenO elseO))))
(def: @savepoint (_.var "lux_pm_savepoint"))
(def: @cursor (_.var "lux_pm_cursor"))
(def: @temp (_.var "lux_pm_temp"))
(def: (push! value)
(-> (Expression Any) (Statement Any))
(_.statement (|> @cursor (_.do "append" (list value)))))
(def: peek-and-pop
(Expression Any)
(|> @cursor (_.do "pop" (list))))
(def: pop!
(Statement Any)
(_.statement ..peek-and-pop))
(def: peek
(Expression Any)
(_.nth (_.int -1) @cursor))
(def: save!
(Statement Any)
(.let [cursor (_.slice-from (_.int +0) @cursor)]
(_.statement (|> @savepoint (_.do "append" (list cursor))))))
(def: restore!
(Statement Any)
(_.set (list @cursor) (|> @savepoint (_.do "pop" (list)))))
(def: fail-pm! _.break)
(def: (multi-pop! pops)
(-> Nat (Statement Any))
(_.delete (_.slice-from (_.int (i/* -1 (.int pops))) @cursor)))
(template [<name> <flag> <prep>]
[(def: (<name> simple? idx)
(-> Bit Nat (Statement Any))
($_ _.then
(_.set (list @temp) (|> idx <prep> .int _.int (//runtime.sum//get ..peek <flag>)))
(.if simple?
(_.when (_.= _.none @temp)
fail-pm!)
(_.if (_.= _.none @temp)
fail-pm!
(..push! @temp))
)))]
[left-choice _.none (<|)]
[right-choice (_.string "") inc]
)
(def: (alternation pre! post!)
(-> (Statement Any) (Statement Any) (Statement Any))
($_ _.then
(_.while (_.bool true)
($_ _.then
..save!
pre!))
($_ _.then
..restore!
post!)))
(def: (pattern-matching' generate pathP)
(-> Phase Path (Operation (Statement Any)))
(.case pathP
(^ (/////synthesis.path/then bodyS))
(:: ////.monad map _.return (generate bodyS))
#/////synthesis.Pop
(////@wrap ..pop!)
(#/////synthesis.Bind register)
(////@wrap (_.set (list (..register register)) ..peek))
(^template [<tag> <format>]
(^ (<tag> value))
(////@wrap (_.when (|> value <format> (_.= ..peek) _.not)
fail-pm!)))
([/////synthesis.path/bit //primitive.bit]
[/////synthesis.path/i64 //primitive.i64]
[/////synthesis.path/f64 //primitive.f64]
[/////synthesis.path/text //primitive.text])
(^template [<complex> <simple> <choice>]
(^ (<complex> idx))
(////@wrap (<choice> false idx))
(^ (<simple> idx nextP))
(|> nextP
(pattern-matching' generate)
(:: ////.monad map (_.then (<choice> true idx)))))
([/////synthesis.side/left /////synthesis.simple-left-side ..left-choice]
[/////synthesis.side/right /////synthesis.simple-right-side ..right-choice])
(^ (/////synthesis.member/left 0))
(////@wrap (|> ..peek (_.nth (_.int +0)) ..push!))
(^template [<pm> <getter>]
(^ (<pm> lefts))
(////@wrap (|> ..peek (<getter> (_.int (.int lefts))) ..push!)))
([/////synthesis.member/left //runtime.tuple//left]
[/////synthesis.member/right //runtime.tuple//right])
(^ (/////synthesis.!bind-top register thenP))
(do ////.monad
[then! (pattern-matching' generate thenP)]
(////@wrap ($_ _.then
(_.set (list (..register register)) ..peek-and-pop)
then!)))
(^ (/////synthesis.!multi-pop nextP))
(.let [[extra-pops nextP'] (case.count-pops nextP)]
(do ////.monad
[next! (pattern-matching' generate nextP')]
(////@wrap ($_ _.then
(..multi-pop! (n/+ 2 extra-pops))
next!))))
(^template [<tag> <combinator>]
(^ (<tag> preP postP))
(do ////.monad
[pre! (pattern-matching' generate preP)
post! (pattern-matching' generate postP)]
(wrap (<combinator> pre! post!))))
([/////synthesis.path/seq _.then]
[/////synthesis.path/alt ..alternation])))
(def: (pattern-matching generate pathP)
(-> Phase Path (Operation (Statement Any)))
(do ////.monad
[pattern-matching! (pattern-matching' generate pathP)]
(wrap ($_ _.then
(_.while (_.bool true)
pattern-matching!)
(_.raise (_.Exception/1 (_.string case.pattern-matching-error)))))))
(def: (gensym prefix)
(-> Text (Operation SVar))
(:: ////.monad map (|>> %n (format prefix) _.var) ///.next))
(def: #export (case generate [valueS pathP])
(-> Phase [Synthesis Path] (Operation (Expression Any)))
(do ////.monad
[initG (generate valueS)
pattern-matching! (pattern-matching generate pathP)
@case (..gensym "case")
@init (..gensym "init")
#let [@dependencies+ (|> (case.storage pathP)
(get@ #case.dependencies)
set.to-list
(list@map (function (_ variable)
(.case variable
(#reference.Local register)
(..register register)
(#reference.Foreign register)
(..capture register)))))]
_ (///.save! true ["" (_.code @case)]
(_.def @case (list& @init @dependencies+)
($_ _.then
(_.set (list @cursor) (_.list (list @init)))
(_.set (list @savepoint) (_.list (list)))
pattern-matching!)))]
(wrap (_.apply/* @case (list& initG @dependencies+)))))
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