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(;module:
lux
(lux (control [applicative]
[monad #+ do Monad]
["p" parser])
(data [text "text/" Eq<Text> Monoid<Text>]
["E" error]
(coll [list "list/" Functor<List> Monoid<List>]))
[macro]
(macro [code]
["s" syntax #+ syntax:]
(syntax ["cs" common]
(common ["csr" reader]
["csw" writer])))))
(def: (get k plist)
(All [a]
(-> Text (List [Text a]) (Maybe a)))
(case plist
#;Nil
#;None
(#;Cons [k' v] plist')
(if (text/= k k')
(#;Some v)
(get k plist'))))
(def: (put k v plist)
(All [a]
(-> Text a (List [Text a]) (List [Text a])))
(case plist
#;Nil
(list [k v])
(#;Cons [k' v'] plist')
(if (text/= k k')
(#;Cons [k' v] plist')
(#;Cons [k' v'] (put k v plist')))))
(def: (remove k plist)
(All [a]
(-> Text (List [Text a]) (List [Text a])))
(case plist
#;Nil
#;Nil
(#;Cons [k' v'] plist')
(if (text/= k k')
plist'
(#;Cons [k' v'] (remove k plist')))))
(def: down-cast Text "@opaque")
(def: up-cast Text "@repr")
(def: macro-anns Code (' {#;macro? true}))
(def: representation-name
(-> Text Text)
(|>. ($_ text/compose "{" kind "@" module "}")
(let [[module kind] (ident-for #;;Representation)])))
(def: (install-casts' this-module-name name type-vars)
(-> Text Text (List Text) (Meta Unit))
(do macro;Monad<Meta>
[this-module (macro;find-module this-module-name)
#let [type-varsC (list/map code;local-symbol type-vars)
opaque-declaration (` ((~ (code;local-symbol name)) (~@ type-varsC)))
representation-declaration (` ((~ (code;local-symbol (representation-name name))) (~@ type-varsC)))
this-module (|> this-module
(update@ #;defs (put down-cast (: Def
[Macro macro-anns
(function [tokens]
(case tokens
(^ (list value))
(wrap (list (` ((: (All [(~@ type-varsC)]
(-> (~ representation-declaration) (~ opaque-declaration)))
(|>. :!!))
(~ value)))))
_
(macro;fail ($_ text/compose "Wrong syntax for " down-cast))))])))
(update@ #;defs (put up-cast (: Def
[Macro macro-anns
(function [tokens]
(case tokens
(^ (list value))
(wrap (list (` ((: (All [(~@ type-varsC)]
(-> (~ opaque-declaration) (~ representation-declaration)))
(|>. :!!))
(~ value)))))
_
(macro;fail ($_ text/compose "Wrong syntax for " up-cast))))]))))]]
(function [compiler]
(#E;Success [(update@ #;modules (put this-module-name this-module) compiler)
[]]))))
(def: (un-install-casts' this-module-name)
(-> Text (Meta Unit))
(do macro;Monad<Meta>
[this-module (macro;find-module this-module-name)
#let [this-module (|> this-module
(update@ #;defs (remove down-cast))
(update@ #;defs (remove up-cast)))]]
(function [compiler]
(#E;Success [(update@ #;modules (put this-module-name this-module) compiler)
[]]))))
(syntax: #hidden (install-casts [name s;local-symbol]
[type-vars (s;tuple (p;some s;local-symbol))])
(do @
[this-module-name macro;current-module-name
?down-cast (macro;find-macro [this-module-name down-cast])
?up-cast (macro;find-macro [this-module-name up-cast])]
(case [?down-cast ?up-cast]
[#;None #;None]
(do @
[_ (install-casts' this-module-name name type-vars)]
(wrap (list)))
_
(macro;fail ($_ text/compose
"Cannot temporarily define casting functions ("
down-cast " & " up-cast
") because definitions like that already exist.")))))
(syntax: #hidden (un-install-casts)
(do macro;Monad<Meta>
[this-module-name macro;current-module-name
?down-cast (macro;find-macro [this-module-name down-cast])
?up-cast (macro;find-macro [this-module-name up-cast])]
(case [?down-cast ?up-cast]
[(#;Some _) (#;Some _)]
(do @
[_ (un-install-casts' this-module-name)]
(wrap (list)))
_
(macro;fail ($_ text/compose
"Cannot un-define casting functions ("
down-cast " & " up-cast
") because they do not exist.")))))
(def: declaration
(s;Syntax [Text (List Text)])
(p;either (s;form (p;seq s;local-symbol (p;some s;local-symbol)))
(p;seq s;local-symbol (:: p;Monad<Parser> wrap (list)))))
(syntax: #export (opaque: [export csr;export]
[[name type-vars] declaration]
[annotations (p;default cs;empty-annotations csr;annotations)]
representation-type
[primitives (p;some s;any)])
(let [hidden-name (code;local-symbol (representation-name name))
type-varsC (list/map code;local-symbol type-vars)
opaque-declaration (` ((~ (code;local-symbol name)) (~@ type-varsC)))
representation-declaration (` ((~ hidden-name) (~@ type-varsC)))]
(wrap (list& (` (type: (~@ (csw;export export)) (~ opaque-declaration)
(~ (csw;annotations annotations))
(primitive (~ hidden-name) [(~@ type-varsC)])))
(` (type: (~@ (csw;export export)) (~ representation-declaration)
(~ representation-type)))
(` (install-casts (~ (code;local-symbol name)) [(~@ type-varsC)]))
(list/compose primitives
(list (` (un-install-casts))))))))
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