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(.module:
[library
[lux {"-" [Module]}
[abstract
["." monad {"+" [do]}]]
[control
["." maybe ("#\." functor)]
["." try {"+" [Try]}]
["." state]
["." function
["." memo {"+" [Memo]}]]]
[data
["." text
["%" format {"+" [format]}]]
[collection
["." list ("#\." functor mix)]
["." dictionary {"+" [Dictionary]}]
["." set {"+" [Set]}]]]]]
[///
["." archive {"+" [Output Archive]}
[key {"+" [Key]}]
["." descriptor {"+" [Module Descriptor]}]
["." document {"+" [Document]}]]])
(type: Ancestry
(Set Module))
(def: fresh
Ancestry
(set.empty text.hash))
(type: .public Graph
(Dictionary Module Ancestry))
(def: empty
Graph
(dictionary.empty text.hash))
(def: .public modules
(-> Graph (List Module))
dictionary.keys)
(type: Dependency
(Record
[#module Module
#imports Ancestry]))
(def: .public graph
(-> (List Dependency) Graph)
(list\mix (function (_ [module imports] graph)
(dictionary.has module imports graph))
..empty))
(def: (ancestry archive)
(-> Archive Graph)
(let [memo (: (Memo Module Ancestry)
(function (_ recur module)
(do {! state.monad}
[.let [parents (case (archive.find module archive)
(#try.Success [descriptor document])
(value@ #descriptor.references descriptor)
(#try.Failure error)
..fresh)]
ancestors (monad.each ! recur (set.list parents))]
(in (list\mix set.union parents ancestors)))))
ancestry (memo.open memo)]
(list\mix (function (_ module memory)
(if (dictionary.key? memory module)
memory
(let [[memory _] (ancestry [memory module])]
memory)))
..empty
(archive.archived archive))))
(def: (dependency? ancestry target source)
(-> Graph Module Module Bit)
(let [target_ancestry (|> ancestry
(dictionary.value target)
(maybe.else ..fresh))]
(set.member? target_ancestry source)))
(type: .public Order
(List [Module [archive.ID [Descriptor (Document .Module) Output]]]))
(def: .public (load_order key archive)
(-> (Key .Module) Archive (Try Order))
(let [ancestry (..ancestry archive)]
(|> ancestry
dictionary.keys
(list.sorted (..dependency? ancestry))
(monad.each try.monad
(function (_ module)
(do try.monad
[module_id (archive.id module archive)
[descriptor document output] (archive.find module archive)
document (document.check key document)]
(in [module [module_id [descriptor document output]]])))))))
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