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|
(.module:
[lux (#- case let if)
[abstract
["." monad (#+ do)]]
[control
[exception (#+ exception:)]]
[data
["." text
["%" format (#+ format)]]
[collection
["." list ("#\." functor fold)]
["." set]]]
[math
[number
["n" nat]
["i" int]]]
[target
["_" python (#+ Expression SVar Statement)]]]
["." // #_
["#." runtime (#+ Operation Phase Generator Phase! Generator!)]
["#." reference]
["#." primitive]
["/#" // #_
["#." reference]
["/#" // #_
[synthesis
["." case]]
["/#" // #_
["#." synthesis (#+ Member Synthesis Path)]
["#." generation]
["//#" /// #_
[reference
["#." variable (#+ Register)]]
["#." phase ("#\." monad)]
[meta
[archive (#+ Archive)]]]]]]])
(def: #export register
(-> Register SVar)
(|>> (///reference.local //reference.system) :assume))
(def: #export capture
(-> Register SVar)
(|>> (///reference.foreign //reference.system) :assume))
(def: #export (let expression archive [valueS register bodyS])
(Generator [Synthesis Register Synthesis])
(do ///////phase.monad
[valueO (expression archive valueS)
bodyO (expression archive 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 (let! statement expression archive [valueS register bodyS])
(Generator! [Synthesis Register Synthesis])
(do ///////phase.monad
[valueO (expression archive valueS)
bodyO (statement expression archive bodyS)]
(wrap ($_ _.then
(_.set (list (..register register)) valueO)
bodyO))))
(def: #export (if expression archive [testS thenS elseS])
(Generator [Synthesis Synthesis Synthesis])
(do ///////phase.monad
[testO (expression archive testS)
thenO (expression archive thenS)
elseO (expression archive elseS)]
(wrap (_.? testO thenO elseO))))
(def: #export (if! statement expression archive [testS thenS elseS])
(Generator! [Synthesis Synthesis Synthesis])
(do ///////phase.monad
[test! (expression archive testS)
then! (statement expression archive thenS)
else! (statement expression archive elseS)]
(wrap (_.if test!
then!
else!))))
(def: #export (get expression archive [pathP valueS])
(Generator [(List Member) Synthesis])
(do ///////phase.monad
[valueO (expression archive valueS)]
(wrap (list\fold (function (_ side source)
(.let [method (.case side
(^template [<side> <accessor>]
[(<side> lefts)
(<accessor> (_.int (.int lefts)))])
([#.Left //runtime.tuple//left]
[#.Right //runtime.tuple//right]))]
(method source)))
valueO
pathP))))
(def: @savepoint (_.var "lux_pm_savepoint"))
(def: @cursor (_.var "lux_pm_cursor"))
(def: @temp (_.var "lux_pm_temp"))
(def: (push! value)
(-> (Expression Any) (Statement Any))
(_.statement (|> @cursor (_.do "append" (list value)))))
(def: peek_and_pop
(Expression Any)
(|> @cursor (_.do "pop" (list))))
(def: pop!
(Statement Any)
(_.statement ..peek_and_pop))
(def: peek
(Expression Any)
(_.nth (_.int -1) @cursor))
(def: save!
(Statement Any)
(.let [cursor (_.slice_from (_.int +0) @cursor)]
(_.statement (|> @savepoint (_.do "append" (list cursor))))))
(def: restore!
(Statement Any)
(_.set (list @cursor) (|> @savepoint (_.do "pop" (list)))))
(def: fail_pm! _.break)
(def: (multi_pop! pops)
(-> Nat (Statement Any))
(_.delete (_.slice_from (_.int (i.* -1 (.int pops))) @cursor)))
(template [<name> <flag> <prep>]
[(def: (<name> simple? idx)
(-> Bit Nat (Statement Any))
($_ _.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!))
($_ _.then
..restore!
post!)))
(def: (pattern_matching' statement expression archive)
(-> Phase! Phase Archive Path (Operation (Statement Any)))
(function (recur pathP)
(.case pathP
(^ (/////synthesis.path/then bodyS))
(statement expression archive bodyS)
#/////synthesis.Pop
(///////phase\wrap ..pop!)
(#/////synthesis.Bind register)
(///////phase\wrap (_.set (list (..register register)) ..peek))
(#/////synthesis.Bit_Fork when thenP elseP)
(do {! ///////phase.monad}
[then! (recur thenP)
else! (.case elseP
(#.Some elseP)
(recur elseP)
#.None
(wrap ..fail_pm!))]
(wrap (.if when
(_.if ..peek
then!
else!)
(_.if ..peek
else!
then!))))
(#/////synthesis.I64_Fork cons)
(do {! ///////phase.monad}
[clauses (monad.map ! (function (_ [match then])
(do !
[then! (recur then)]
(wrap [(_.= (//primitive.i64 (.int match))
..peek)
then!])))
(#.Cons cons))]
(wrap (_.cond clauses
..fail_pm!)))
(^template [<tag> <format>]
[(<tag> cons)
(do {! ///////phase.monad}
[clauses (monad.map ! (function (_ [match then])
(\ ! map
(|>> [(_.= (<format> match)
..peek)])
(recur then)))
(#.Cons cons))]
(wrap (_.cond clauses
..fail_pm!)))])
([#/////synthesis.F64_Fork //primitive.f64]
[#/////synthesis.Text_Fork //primitive.text])
(^template [<complex> <simple> <choice>]
[(^ (<complex> idx))
(///////phase\wrap (<choice> false idx))
(^ (<simple> idx nextP))
(|> nextP
recur
(///////phase\map (_.then (<choice> true idx))))])
([/////synthesis.side/left /////synthesis.simple_left_side ..left_choice]
[/////synthesis.side/right /////synthesis.simple_right_side ..right_choice])
(^ (/////synthesis.member/left 0))
(///////phase\wrap (|> ..peek (_.nth (_.int +0)) ..push!))
(^template [<pm> <getter>]
[(^ (<pm> lefts))
(///////phase\wrap (|> ..peek (<getter> (_.int (.int lefts))) ..push!))])
([/////synthesis.member/left //runtime.tuple//left]
[/////synthesis.member/right //runtime.tuple//right])
(^ (/////synthesis.!bind_top register thenP))
(do ///////phase.monad
[then! (recur thenP)]
(///////phase\wrap ($_ _.then
(_.set (list (..register register)) ..peek_and_pop)
then!)))
(^ (/////synthesis.!multi_pop nextP))
(.let [[extra_pops nextP'] (case.count_pops nextP)]
(do ///////phase.monad
[next! (recur nextP')]
(///////phase\wrap ($_ _.then
(..multi_pop! (n.+ 2 extra_pops))
next!))))
(^template [<tag> <combinator>]
[(^ (<tag> preP postP))
(do ///////phase.monad
[pre! (recur preP)
post! (recur postP)]
(wrap (<combinator> pre! post!)))])
([/////synthesis.path/seq _.then]
[/////synthesis.path/alt ..alternation]))))
(def: (pattern_matching statement expression archive pathP)
(-> Phase! Phase Archive Path (Operation (Statement Any)))
(do ///////phase.monad
[pattern_matching! (pattern_matching' statement expression archive pathP)]
(wrap ($_ _.then
(_.while (_.bool true)
pattern_matching!)
(_.raise (_.Exception/1 (_.string case.pattern_matching_error)))))))
(def: #export dependencies
(-> Path (List SVar))
(|>> case.storage
(get@ #case.dependencies)
set.to_list
(list\map (function (_ variable)
(.case variable
(#///////variable.Local register)
(..register register)
(#///////variable.Foreign register)
(..capture register))))))
(def: #export (gensym prefix)
(-> Text (Operation SVar))
(///////phase\map (|>> %.nat (format prefix) _.var) /////generation.next))
(def: #export (case! statement expression archive [valueS pathP])
(Generator! [Synthesis Path])
(do ///////phase.monad
[stack_init (expression archive valueS)
pattern_matching! (pattern_matching statement expression archive pathP)]
(wrap ($_ _.then
(_.set (list @cursor) (_.list (list stack_init)))
(_.set (list @savepoint) (_.list (list)))
pattern_matching!
))))
(def: #export (case statement expression archive [valueS pathP])
(-> Phase! (Generator [Synthesis Path]))
(do ///////phase.monad
[[[case_module case_artifact] pattern_matching!] (/////generation.with_new_context archive
(case! statement expression archive [valueS pathP]))
#let [@case (_.var (///reference.artifact [case_module case_artifact]))
@dependencies+ (..dependencies (/////synthesis.path/seq (/////synthesis.path/then valueS)
pathP))
directive (_.def @case @dependencies+
pattern_matching!)]
_ (/////generation.execute! directive)
_ (/////generation.save! (%.nat case_artifact) directive)]
(wrap (_.apply/* @case @dependencies+))))
|
