mirror of
https://github.com/urbit/shrub.git
synced 2024-12-29 23:23:52 +03:00
115 lines
3.7 KiB
Haskell
115 lines
3.7 KiB
Haskell
module Nock where
|
|
|
|
import ClassyPrelude
|
|
|
|
import Dashboard
|
|
import SimpleNoun
|
|
|
|
data Nock
|
|
= NC Nock Nock -- ^ ^: autocons
|
|
| N0 Axis -- ^ 0, axis: tree addressing
|
|
| N1 Noun -- ^ 1, const
|
|
| N2 Nock Nock -- ^ 2, compose: compute subject, formula; apply
|
|
| N3 Nock -- ^ 3, is cell
|
|
| N4 Nock -- ^ 4, succ
|
|
| N5 Nock Nock -- ^ 5, eq
|
|
| N6 Nock Nock Nock -- ^ 6, if
|
|
| N7 Nock Nock -- ^ 7, then: =>
|
|
| N8 Nock Nock -- ^ 8, push: =+
|
|
| N9 Axis Nock -- ^ 9, invoke
|
|
| N10 (Axis, Nock) Nock -- ^ 10, edit
|
|
| N11 Hint Nock -- ^ 11, hint
|
|
| N12 Nock Nock -- ^ 12, scry
|
|
deriving (Eq, Ord, Read, Generic)
|
|
|
|
data Hint
|
|
= Tag Atom
|
|
| Assoc Atom Nock
|
|
deriving (Eq, Ord, Read, Show, Generic)
|
|
|
|
instance Hashable Nock
|
|
instance Hashable Hint
|
|
|
|
instance Show Nock where
|
|
show = show . nockToNoun
|
|
|
|
nockToNoun :: Nock -> Noun
|
|
nockToNoun = go
|
|
where
|
|
go = \case
|
|
NC f g -> C (go f) (go g)
|
|
N0 a -> C (A 0) (A a)
|
|
N1 n -> C (A 1) n
|
|
N2 f g -> C (A 2) (C (go f) (go g))
|
|
N3 f -> C (A 3) (go f)
|
|
N4 f -> C (A 4) (go f)
|
|
N5 f g -> C (A 5) (C (go f) (go g))
|
|
N6 f g h -> C (A 6) (C (go f) (C (go g) (go h)))
|
|
N7 f g -> C (A 7) (C (go f) (go g))
|
|
N8 f g -> C (A 8) (C (go f) (go g))
|
|
N9 a f -> C (A 9) (C (A a) (go f))
|
|
N10 (a, f) g -> C (A 10) (C (C (A a) (go f)) (go g))
|
|
N11 (Tag a) f -> C (A 11) (C (A a) (go f))
|
|
N11 (Assoc a f) g -> C (A 11) (C (C (A a) (go f)) (go g))
|
|
N12 f g -> C (A 12) (C (go f) (go g))
|
|
|
|
nounToNock :: Noun -> Nock
|
|
nounToNock = go
|
|
where
|
|
go = \case
|
|
A{} -> error "nounToNock: atom"
|
|
C n@C{} m -> NC (go n) (go m)
|
|
C (A op) n -> case op of
|
|
0 | (A a) <- n -> N0 a
|
|
1 -> N1 n
|
|
2 | (C m o) <- n -> N2 (go m) (go o)
|
|
3 -> N3 (go n)
|
|
4 -> N4 (go n)
|
|
5 | (C m o) <- n -> N5 (go m) (go o)
|
|
6 | (C m (C o p)) <- n -> N6 (go m) (go o) (go p)
|
|
7 | (C m o) <- n -> N7 (go m) (go o)
|
|
8 | (C m o) <- n -> N8 (go m) (go o)
|
|
9 | (C (A a) m) <- n -> N9 a (go m)
|
|
10 | (C (C (A a) m) o) <- n -> N10 (a, (go m)) (go o)
|
|
11 | (C (C (A a) m) o) <- n -> N11 (Assoc a (go m)) (go o)
|
|
| (C (A a) m) <- n -> N11 (Tag a) (go m)
|
|
12 | (C m o) <- n -> N12 (go m) (go o)
|
|
_ -> error ("nockToNoun: invalid " <> show op <> " " <> show n)
|
|
|
|
-- | Nock interpreter
|
|
nock :: (Dashboard d) => Noun -> Nock -> d Noun
|
|
nock n = \case
|
|
NC f g -> C <$> nock n f <*> nock n g
|
|
N0 a -> pure $ axis a n
|
|
N1 n' -> pure n'
|
|
N2 sf ff -> do
|
|
s <- nock n sf
|
|
f <- nock n ff
|
|
match f >>= \case
|
|
Just jet -> pure (jet s)
|
|
Nothing -> nock s (nounToNock f)
|
|
N3 f -> nock n f <&> \case
|
|
C{} -> yes
|
|
A{} -> no
|
|
N4 f -> nock n f <&> \case
|
|
C{} -> error "nock: cannot increment cell"
|
|
A a -> A (a + 1)
|
|
N5 f g -> loob <$> ((==) <$> nock n f <*> nock n g)
|
|
N6 f g h -> nock n f >>= \case
|
|
(A 0) -> nock n g
|
|
(A 1) -> nock n h
|
|
_ -> error "nock: invalid test value"
|
|
N7 f g -> do
|
|
n' <- nock n f
|
|
nock n' g
|
|
N8 f g -> do
|
|
n' <- nock n f
|
|
nock (C n' n) g
|
|
N9 a f -> do
|
|
c <- nock n f
|
|
nock c (nounToNock (axis a c))
|
|
N10 (a, f) g -> edit a <$> nock n f <*> nock n g
|
|
N11 _ f -> nock n f
|
|
N12{} -> error "nock: scrying is not allowed"
|
|
|