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(.module:
[library
[lux "*"
[abstract
[equivalence {"+" Equivalence}]
[monad {"+" do}]]
[control
["[0]" try {"+" Try}]]
[data
[format
[binary {"+" Writer}]]
[text
["%" format {"+" Format}]]]
[math
[number
["n" nat]]]
[type
abstract]]]
["[0]" // "_"
[jump {"+" Big_Jump}]
["/[1]" // "_"
[encoding
["[1][0]" unsigned {"+" U2}]
["[1][0]" signed {"+" S4}]]]])
(abstract: .public Address
U2
(def: .public value
(-> Address U2)
(|>> :representation))
(def: .public start
Address
(|> 0 ///unsigned.u2 try.trusted :abstraction))
(def: .public (move distance)
(-> U2 (-> Address (Try Address)))
(|>> :representation
(///unsigned.+/2 distance)
(# try.functor each (|>> :abstraction))))
(def: with_sign
(-> Address (Try S4))
(|>> :representation ///unsigned.value .int ///signed.s4))
(def: .public (jump from to)
(-> Address Address (Try Big_Jump))
(do try.monad
[from (with_sign from)
to (with_sign to)]
(///signed.-/4 from to)))
(def: .public (after? reference subject)
(-> Address Address Bit)
(n.> (|> reference :representation ///unsigned.value)
(|> subject :representation ///unsigned.value)))
(implementation: .public equivalence
(Equivalence Address)
(def: (= reference subject)
(# ///unsigned.equivalence =
(:representation reference)
(:representation subject))))
(def: .public writer
(Writer Address)
(|>> :representation ///unsigned.writer/2))
(def: .public format
(Format Address)
(|>> :representation ///unsigned.value %.nat))
)
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