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(.module:
lux
(lux (control ["p" parser]
[monad #+ do])
(data [sum]
(coll [list "list/" Functor<List>]))
[macro "meta/" Monad<Meta>]
(macro [code]
["s" syntax #+ syntax:]
(syntax ["cs" common]
(common ["csr" reader]
["csw" writer])))))
(type: #export (Method i o)
(All [r] [i (-> o r)]))
(type: #export (Message i o)
(Method i o o))
(def: #export (message input)
(All [i o] (-> i (Message i o)))
[input id])
(type: #export (Class s p)
(All [r] (-> (p r) s [r s])))
(type: #export (Alt lp rp)
(All [r] (| (lp r) (rp r))))
(def: #export (alt left right)
(All [s lp rp]
(-> (Class s lp)
(Class s rp)
(Class s (Alt lp rp))))
(function (_ input state)
(case input
(#.Left input)
(left input state)
(#.Right input)
(right input state))))
(type: #export (Object p)
(All [r] (-> (p r) [r (Object p)])))
(def: #export (object class init)
(All [s p] (-> (Class s p) s (Object p)))
(loop [state init]
(function (_ input)
(let [[output state'] (class input state)]
[output (recur state')]))))
(type: Method-Syntax
{#method-variables (List Text)
#method-name Text
#method-input Code
#method-output Code})
(def: method|r
(s.Syntax Method-Syntax)
(s.form ($_ p.seq
(p.default (list) csr.type-variables)
s.local-symbol
s.any
s.any)))
(def: (method|w g!return method)
(-> Code Method-Syntax Code)
(let [tagC (code.local-tag (get@ #method-name method))
varsC+ (csw.type-variables (get@ #method-variables method))
inputC (get@ #method-input method)
outputC (get@ #method-output method)]
(` ((~ tagC) (All [(~+ varsC+)]
(Method (~ inputC) (~ outputC) (~ g!return)))))))
(def: (method|c export protocol method)
(-> Bool cs.Declaration Method-Syntax (Meta Code))
(let [methodC (code.local-symbol (get@ #method-name method))
tagC (code.local-tag (get@ #method-name method))
protocolC (code.local-symbol (get@ #cs.declaration-name protocol))
protocol-varsC+ (csw.type-variables (get@ #cs.declaration-args protocol))
method-varsC+ (csw.type-variables (get@ #method-variables method))
method-inputC (get@ #method-input method)
method-outputC (get@ #method-output method)]
(macro.with-gensyms [g!input g!return]
(meta/wrap (` (def: (~+ (csw.export export)) ((~ methodC) (~ g!input))
(All [(~+ protocol-varsC+) (~+ method-varsC+)]
(-> (~ method-inputC)
((~ protocolC) (~+ protocol-varsC+) (~ method-outputC))))
((~ tagC) [(~ g!input) .id])))))))
(type: Class-Syntax
{#class-name Text
#class-protocol Code})
(def: class|r
(s.Syntax Class-Syntax)
(s.form ($_ p.seq
s.local-symbol
s.any)))
(def: (class|w g!return class)
(-> Code Class-Syntax Code)
(let [tagC (code.local-tag (get@ #class-name class))
protocolC (get@ #class-protocol class)]
(` ((~ tagC) ((~ protocolC) (~ g!return))))))
(def: (class|c export protocol class)
(-> Bool cs.Declaration Class-Syntax (Meta Code))
(let [classC (code.local-symbol (get@ #class-name class))
tagC (code.local-tag (get@ #class-name class))
protocolC (code.local-symbol (get@ #cs.declaration-name protocol))
protocol-varsC+ (csw.type-variables (get@ #cs.declaration-args protocol))
class-protocolC (get@ #class-protocol class)]
(macro.with-gensyms [g!sub g!return]
(meta/wrap (` (def: (~+ (csw.export export)) ((~ classC) (~ g!sub))
(All [(~+ protocol-varsC+)]
(-> (~ class-protocolC)
((~ protocolC) (~+ protocol-varsC+))))
((~ tagC) (~ g!sub))))))))
(type: Super-Syntax
(#Method Method-Syntax)
(#Class Class-Syntax))
(def: super|r
(s.Syntax Super-Syntax)
(p.alt method|r
class|r))
(def: (super|w g!return)
(-> Code Super-Syntax Code)
(sum.either (method|w g!return)
(class|w g!return)))
(def: (super|c export protocol)
(-> Bool cs.Declaration (| Method-Syntax Class-Syntax) (Meta Code))
(sum.either (method|c export protocol)
(class|c export protocol)))
(syntax: #export (protocol:
{export csr.export}
{declaration csr.declaration}
{supers (p.many super|r)})
(macro.with-gensyms [g!return]
(do @
[constructors (monad.map @ (super|c export declaration) supers)
#let [protocolC (code.local-symbol (get@ #cs.declaration-name declaration))
varsC+ (csw.type-variables (get@ #cs.declaration-args declaration))]]
(wrap (list& (` (type: (~+ (csw.export export))
((~ protocolC) (~+ varsC+) (~ g!return))
(~+ (list/map (super|w g!return) supers))))
constructors)))))
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