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(def (fail* message)
(#Failure message))
(def (return* state value)
(#Ok [state value]))
(def (fail message)
(lambda [state]
(#Failure message)))
(def (return value)
(lambda [state]
(#Ok [state value])))
(def (bind m-value step)
(lambda [state]
(let inputs (m-value state)
(case inputs
(#Ok [?state ?datum])
(step ?datum ?state)
_
inputs))))
## Ideally, this is what I want...
## (exec [yolo lol
## #let [foo (bar 1 2 3)]]
## (meme yolo foo))
(defmacro (exec tokens)
(case tokens
(#Cons (#Tuple steps) (#Cons value #Nil))
(fold (lambda [inner pair]
(case pair
[label computation]
(' (bind (~ computation) (lambda [(~ label)] (~ inner))))))
value
(pairs steps))))
(def (try-m monad)
(lambda [state]
(case (monad state)
(#Ok [?state ?datum])
(return* ?state (#Just ?datum))
(#Failure _)
(return* state #Nothing))))
(def (repeat-m monad)
(lambda [state]
(case (monad state)
(#Ok [?state ?head])
(case ((repeat-m monad) ?state)
(#Ok [?state* ?tail])
(return* ?state* (#Cons ?head ?tail)))
(#Failure ?message)
(return* state #Nil))))
(def (try-all-m monads)
(lambda [state]
(case monads
#Nil
(fail* "No alternative worked!")
(#Cons monad monads')
(let output (monad state)
(case output
(#Ok _)
output
(#Failure _)
(case monads'
#Nil
output
(#Cons _ _)
((try-all-m monads') state))
))
)))
(def (map-m f inputs)
(case inputs
#Nil
(return #Nil)
(#Cons input inputs')
(exec [output (f input)
outputs (map-m f inputs')]
(return (#Cons output outputs)))))
(def (fold-m f init inputs)
(case inputs
#Nil (return init)
(#Cons x inputs') (exec [init* (f init x)]
(fold-m f init* inputs'))))
(def (apply-m monad call-state)
(lambda [state]
(let output (monad call-state)
(case output
(#Ok [?state ?datum])
(#Ok [state ?datum])
_
output))))
(def (assert test message)
(if test
(return [])
(fail message)))
(def (pass %value)
(lambda [state]
%value))
(def get-state
(lambda [state]
(return* state state)))
(def (normalize-char char)
(case char
#"*" "_ASTER_"
#"+" "_PLUS_"
#"-" "_DASH_"
#"/" "_SLASH_"
#"_" "_UNDERS_"
#"%" "_PERCENT_"
#"$" "_DOLLAR_"
#"'" "_QUOTE_"
#"`" "_BQUOTE_"
#"@" "_AT_"
#"^" "_CARET_"
#"&" "_AMPERS_"
#"=" "_EQ_"
#"!" "_BANG_"
#"?" "_QM_"
#":" "_COLON_"
#";" "_SCOLON_"
#"." "_PERIOD_"
#"," "_COMMA_"
#"<" "_LT_"
#">" "_GT_"
#"~" "_TILDE_"
##;;#"\" "_BSLASH_"
_ (show char)
))
(def (normalize-ident ident)
(fold concat "" (map normalize-char (text->list ident))))
(def (within slot monad)
(lambda [state]
(let =return (monad (get slot state))
(case =return
(#Ok ?state ?value)
(#Ok (put slot ?state state) ?value)
_
=return))))
(def (run-state monad state)
(monad state))
(def (fresh-class-loader path)
(let file (jvm/new java.io.File [String] [path])
(let url (jvm/invokevirtual java.io.File "toURL" []
file [])
(let urls (jvm/new-array java.net.URL 1)
(do (jvm/aastore urls 0 url)
(jvm/new java.net.URLClassLoader [(Array java.net.URL)] [urls]))))
))
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