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(.module:
[lux #*
[abstract
["." monad (#+ do)]]
[control
["ex" exception (#+ exception:)]]
[data
["." maybe]
["." text
format]
[collection
["." list ("#;." functor monoid fold)]
["dict" dictionary (#+ Dictionary)]]]]
["." // #_
["#." loop (#+ Transform)]
["#/" // ("#;." monad)
["#/" // #_
["#." reference (#+ Register Variable)]
["#." analysis (#+ Environment Arity Analysis)]
["/" synthesis (#+ Path Synthesis Operation Phase)]]]])
(exception: #export (cannot-find-foreign-variable-in-environment {foreign Register} {environment Environment})
(ex.report ["Foreign" (%n foreign)]
["Environment" (|> environment
(list;map ////reference.%variable)
(text.join-with " "))]))
(def: arity-arguments
(-> Arity (List Synthesis))
(|>> dec
(list.n/range 1)
(list;map (|>> /.variable/local))))
(template: #export (self-reference)
(/.variable/local 0))
(def: (expanded-nested-self-reference arity)
(-> Arity Synthesis)
(/.function/apply [(..self-reference) (arity-arguments arity)]))
(def: #export (apply phase)
(-> Phase Phase)
(function (_ exprA)
(let [[funcA argsA] (////analysis.application exprA)]
(do ///.monad
[funcS (phase funcA)
argsS (monad.map @ phase argsA)
## locals /.locals
]
(with-expansions [<apply> (as-is (/.function/apply [funcS argsS]))]
(case funcS
## (^ (/.function/abstraction functionS))
## (wrap (|> functionS
## (//loop.loop (get@ #/.environment functionS) locals argsS)
## (maybe.default <apply>)))
(^ (/.function/apply [funcS' argsS']))
(wrap (/.function/apply [funcS' (list;compose argsS' argsS)]))
_
(wrap <apply>)))))))
(def: (find-foreign environment register)
(-> Environment Register (Operation Variable))
(case (list.nth register environment)
(#.Some aliased)
(///;wrap aliased)
#.None
(///.throw cannot-find-foreign-variable-in-environment [register environment])))
(def: (grow-path grow path)
(-> (-> Synthesis (Operation Synthesis)) Path (Operation Path))
(case path
(#/.Bind register)
(///;wrap (#/.Bind (inc register)))
(^template [<tag>]
(<tag> left right)
(do ///.monad
[left' (grow-path grow left)
right' (grow-path grow right)]
(wrap (<tag> left' right'))))
([#/.Alt] [#/.Seq])
(#/.Then thenS)
(|> thenS
grow
(///;map (|>> #/.Then)))
_
(///;wrap path)))
(def: (grow-sub-environment super sub)
(-> Environment Environment (Operation Environment))
(monad.map ///.monad
(function (_ variable)
(case variable
(#////reference.Local register)
(///;wrap (#////reference.Local (inc register)))
(#////reference.Foreign register)
(find-foreign super register)))
sub))
(def: (grow environment expression)
(-> Environment Synthesis (Operation Synthesis))
(case expression
(#/.Structure structure)
(case structure
(#////analysis.Variant [lefts right? subS])
(|> subS
(grow environment)
(///;map (|>> [lefts right?] /.variant)))
(#////analysis.Tuple membersS+)
(|> membersS+
(monad.map ///.monad (grow environment))
(///;map (|>> /.tuple))))
(^ (..self-reference))
(///;wrap (/.function/apply [expression (list (/.variable/local 1))]))
(#/.Reference reference)
(case reference
(#////reference.Variable variable)
(case variable
(#////reference.Local register)
(///;wrap (/.variable/local (inc register)))
(#////reference.Foreign register)
(|> register
(find-foreign environment)
(///;map (|>> /.variable))))
(#////reference.Constant constant)
(///;wrap expression))
(#/.Control control)
(case control
(#/.Branch branch)
(case branch
(#/.Let [inputS register bodyS])
(do ///.monad
[inputS' (grow environment inputS)
bodyS' (grow environment bodyS)]
(wrap (/.branch/let [inputS' (inc register) bodyS'])))
(#/.If [testS thenS elseS])
(do ///.monad
[testS' (grow environment testS)
thenS' (grow environment thenS)
elseS' (grow environment elseS)]
(wrap (/.branch/if [testS' thenS' elseS'])))
(#/.Case [inputS pathS])
(do ///.monad
[inputS' (grow environment inputS)
pathS' (grow-path (grow environment) pathS)]
(wrap (/.branch/case [inputS' pathS']))))
(#/.Loop loop)
(case loop
(#/.Scope [start initsS+ iterationS])
(do ///.monad
[initsS+' (monad.map @ (grow environment) initsS+)
iterationS' (grow environment iterationS)]
(wrap (/.loop/scope [start initsS+' iterationS'])))
(#/.Recur argumentsS+)
(|> argumentsS+
(monad.map ///.monad (grow environment))
(///;map (|>> /.loop/recur))))
(#/.Function function)
(case function
(#/.Abstraction [_env _arity _body])
(do ///.monad
[_env' (grow-sub-environment environment _env)]
(wrap (/.function/abstraction [_env' _arity _body])))
(#/.Apply funcS argsS+)
(case funcS
(^ (/.function/apply [(..self-reference) pre-argsS+]))
(///;wrap (/.function/apply [(..self-reference)
(list;compose pre-argsS+ argsS+)]))
_
(do ///.monad
[funcS' (grow environment funcS)
argsS+' (monad.map @ (grow environment) argsS+)]
(wrap (/.function/apply [funcS' argsS+']))))))
(#/.Extension name argumentsS+)
(|> argumentsS+
(monad.map ///.monad (grow environment))
(///;map (|>> (#/.Extension name))))
_
(///;wrap expression)))
(def: #export (abstraction phase environment bodyA)
(-> Phase Environment Analysis (Operation Synthesis))
(do ///.monad
[bodyS (phase bodyA)]
(case bodyS
(^ (/.function/abstraction [env' down-arity' bodyS']))
(|> bodyS'
(grow env')
(:: @ map (|>> [environment (inc down-arity')] /.function/abstraction)))
_
(wrap (/.function/abstraction [environment 1 bodyS])))))
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