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(.module:
[lux (#- Source Module)
[control
["." monad (#+ Monad do)]
["ex" exception (#+ exception:)]]
[concurrency
["." promise (#+ Promise) ("#;." functor)]
["." task (#+ Task)]
["." stm (#+ Var STM)]]
[data
["." error (#+ Error) ("#;." monad)]
["." text ("#;." equivalence)]
[collection
["." list ("#;." functor)]
["." dictionary (#+ Dictionary)]]]
["." io]]
["." // (#+ Source Mediator)
[//
["." compiler (#+ Input Output Compilation Compiler)
[meta
["." archive (#+ Archive)
["." descriptor (#+ Module Descriptor)]
[document (#+ Document)]]
[io
["." context]]]]]])
(exception: #export (self-dependency {module Module})
(ex.report ["Module" module]))
(exception: #export (circular-dependency {module Module} {dependency Module})
(ex.report ["Module" module]
["Dependency" dependency]))
(type: Pending-Compilation
(Promise (Error (Ex [d] (Document d)))))
(type: Active-Compilations
(Dictionary Module [Descriptor Pending-Compilation]))
(def: (self-dependence? module dependency)
(-> Module Module Bit)
(text;= module dependency))
(def: (circular-dependence? active dependency)
(-> Active-Compilations Module Bit)
(case (dictionary.get dependency active)
(#.Some [descriptor pending])
(case (get@ #descriptor.state descriptor)
#.Active
true
_
false)
#.None
false))
(def: (ensure-valid-dependencies! active dependencies module)
(-> Active-Compilations (List Module) Module (Task Any))
(do task.monad
[_ (: (Task Any)
(if (list.any? (self-dependence? module) dependencies)
(task.throw self-dependency module)
(wrap [])))]
(: (Task Any)
(case (list.find (circular-dependence? active) dependencies)
(#.Some dependency)
(task.throw circular-dependency module dependency)
#.None
(wrap [])))))
(def: (share-compilation archive pending)
(-> Active-Compilations Pending-Compilation (Task Archive))
(promise;map (|>> (error;map (function (_ document)
(archive.add module document archive)))
error;join)
pending))
(def: (import Monad<!> mediate archive dependencies)
(All [!] (-> (Monad !) (Mediator !) Active-Compilations (List Module) (! (List Archive))))
(|> dependencies
(list;map (mediate archive))
(monad.seq Monad<!>)))
(def: (step-compilation archive imports [dependencies process])
(All [d o] (-> Archive (List Archive) (Compilation d o)
[Archive (Either (Compilation d o)
[(Document d) (Output o)])]))
(do error.monad
[archive' (monad.fold error.monad archive.merge archive imports)
outcome (process archive')]
(case outcome
(#.Right [document output])
(do @
[archive'' (archive.add module document archive')]
(wrap [archive'' (#.Right [document output])]))
(#.Left continue)
(wrap [archive' outcome]))))
(def: (request-compilation file-system sources module compilations)
(All [!]
(-> (file.System Task) (List Source) Module (Var Active-Compilations)
(Task (Either Pending-Compilation
[Pending-Compilation Active-Compilations Input]))))
(do (:: file-system &monad)
[current (|> (stm.read compilations)
stm.commit
task.from-promise)]
(case (dictionary.get module current)
(#.Some [descriptor pending])
(wrap (#.Left pending))
#.None
(do @
[input (context.read file-system sources module)]
(do stm.monad
[stale (stm.read compilations)]
(case (dictionary.get module stale)
(#.Some [descriptor pending])
(wrap (#.Left [pending current]))
#.None
(do @
[#let [base-descriptor {#descriptor.hash (get@ #compiler.hash input)
#descriptor.name (get@ #compiler.module input)
#descriptor.file (get@ #compiler.file input)
#descriptor.references (list)
#descriptor.state #.Active}
pending (promise.promise (: (Maybe (Error (Ex [d] (Document d))))
#.None))]
updated (stm.update (dictionary.put (get@ #compiler.module input)
[base-descriptor pending])
compilations)]
(wrap (is? current stale)
(#.Right [pending updated input])))))))))
(def: (mediate-compilation Monad<!> mediate compiler input archive pending)
(All [! d o] (-> (Monad !) (Mediator ! d o) (Compiler d o) Input Archive Pending-Compilation (Task Archive)))
(loop [archive archive
compilation (compiler input)]
(do Monad<!>
[#let [[dependencies process] compilation]
_ (ensure-valid-dependencies! active dependencies (get@ #compiler.module input))
imports (import @ mediate archive dependencies)
[archive' next] (promise;wrap (step-compilation archive imports compilation))]
(case next
(#.Left continue)
(recur archive' continue)
(#.Right [document output])
(exec (io.run (promise.resolve (#error.Success document) pending))
(wrap archive'))))))
(def: #export (mediator file-system sources compiler)
(//.Instancer Task)
(let [compilations (: (Var Active-Compilations)
(stm.var (dictionary.new text.hash)))]
(function (mediate archive module)
(do (:: file-system &monad)
[request (request-compilation file-system sources module compilations)]
(case request
(#.Left pending)
(share-compilation archive pending)
(#.Right [pending active input])
(mediate-compilation @ mediate compiler input archive pending))))))
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