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(.module:
[library
[lux (#- Scope)
[abstract
["." monad (#+ do)]]
[data
["." product]
["." text
["%" format (#+ format)]]
[collection
["." list ("#\." functor fold)]
["." set (#+ Set)]]]
[math
[number
["n" nat]]]
[target
["_" r]]]]
["." // #_
[runtime (#+ Operation Phase Generator)]
["#." case]
["/#" // #_
["#." reference]
["/#" // #_
[synthesis
["." case]]
["/#" // #_
["."synthesis (#+ Scope Synthesis)]
["#." generation]
["//#" /// #_
["#." phase]
[meta
[archive (#+ Archive)]]
[reference
[variable (#+ Register)]]]]]]])
(def: #export (scope expression archive [offset initsS+ bodyS])
(Generator (Scope Synthesis))
(case initsS+
## function/false/non-independent loop
#.Nil
(expression archive bodyS)
## true loop
_
(do {! ///////phase.monad}
[$scope (\ ! map _.var (/////generation.gensym "loop_scope"))
initsO+ (monad.map ! (expression archive) initsS+)
bodyO (/////generation.with_anchor $scope
(expression archive bodyS))]
(wrap (_.block
($_ _.then
(_.set! $scope
(_.function (|> initsS+
list.size
list.indices
(list\map (|>> (n.+ offset) //case.register)))
bodyO))
(_.apply initsO+ $scope)))))))
(def: #export (recur expression archive argsS+)
(Generator (List Synthesis))
(do {! ///////phase.monad}
[$scope /////generation.anchor
argsO+ (monad.map ! (expression archive) argsS+)]
(wrap (_.apply argsO+ $scope))))
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