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Created May 16, 2020 15:20
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lazyk.grass

lazyk.grass

Lazy K interpreter in Grass language

How to build

You need grasspiler

$ grasspile lazyk.ml -o lazy-k.grass

Usage

$ grass lazyk.grass < sample-fizzbuzz.grass

Limitations

  • support Unlambda-style syntax only
  • don't accept extra characters in the source code, even spaces or line breaks
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(* Lazy K interpreter (unlambda syntax only) *)
let c2 f x = f (f x)
let s2 = c2 Succ
let s4 = c2 s2
let s8 = c2 s4
let s16 = c2 s8
let s32 = c2 s16
let s64 = c2 s32
let s128 = c2 s64
let ch0 = s128 (s8 (Succ w)) (* 119 + 137 *)
let chbq = s64 (s32 ch0) (* 96 *)
let ch97 = Succ chbq
let chi = s8 ch97 (* 105 *)
let chk = s2 chi (* 107 *)
let chs = s8 chk (* 115 *)
let app df da = df da da (* (force df) da *)
let succcn _ n _ f _ x = app f (app (app n f) x)
let cn0 _ f _ x = x
let ch2cn ch =
let f self c cn =
let sc = Succ c in
let scn = app succcn cn in
let recur = self self sc in
let eq = ch c in
let t = eq cn in
eq t recur scn
in
f f ch0 cn0
let dapp df da t = (* (delay *)
let d = df t da in (* ((force df) da) *)
d d (* |> force) *)
let tS _ _ x _ y _ z = app (app x z) (dapp y z)
let tK _ _ x _ y = x
let tI _ _ x = x
let read_app read t =
let f = read t in
let a = read f in
dapp f a
let id x = x
let Out = id Out
let read_unl_ self _ =
let r = self self in
let c = In Out in
let ok = c c in
let isbq = chbq c (read_app r) in
let iss = chs c tS in
let isk = chk c tK in
let isi = chi c tI in
let t = isbq (iss (isk (isi Out))) in
t t
let read_unl _ =
let r = read_unl_ read_unl_ in
let d = r r in
d d
let app df da = df da da
let cn2 _ f _ x = app f (app f x)
let cn4 = app cn2 cn2
let cn256 = app cn4 cn4
let cycle_ self _ b = app (app b cn256) (self self)
let tail = cycle_ cycle_
let cons x y _ b = app (app b x) y
let make_cont c k acc = k (cons (ch2cn c) acc)
let ignore2 x y z = z
let read_ self k =
let recur = self self in
let c = In ignore2 in
let noteof = c c in
let f = noteof recur k in
let a = noteof (make_cont c k) tail in
f a
let read_stdin k = read_ read_ k
let id x = x
let const x _ = id x
let succch _ dch =
let ch = dch dch in
const (Succ ch)
let cn2ch cn =
let dch = app (app cn succch) (const ch0) in
dch dch
let false x y = y
let true x y = id x
let iseof cn =
let isch0 = cn2ch cn ch0 in
let notcn0 = app (app cn (true (true true))) false in
isch0 notcn0 false
let dtrue _ x _ y = x
let dfalse _ x _ y = y
let app df da = df da da
let print_ self lst =
let recur = self self in
let cn = app lst dtrue in
let e = iseof cn in
let t = e e in
let _ = t Out (cn2ch cn) in
t recur (app lst dfalse)
let print = print_ print_
let main t =
let prog = read_unl t in
let result = read_stdin prog in
print result
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