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Fix comment typo.
[haskell/symantic.git] / symantic-lib / Language / Symantic / Lib / Functor.hs
1 {-# LANGUAGE UndecidableInstances #-}
2 {-# OPTIONS_GHC -fno-warn-orphans #-}
3 -- | Symantic for 'Functor'.
4 module Language.Symantic.Lib.Functor where
5
6 import Control.Monad (liftM2)
7 import qualified Data.Function as Fun
8 import Data.Functor (Functor)
9 import qualified Data.Functor as Functor
10 import Data.Proxy (Proxy(..))
11 import Data.Type.Equality
12 import Prelude hiding (Functor(..))
13
14 import Language.Symantic.Parsing
15 import Language.Symantic.Typing
16 import Language.Symantic.Compiling
17 import Language.Symantic.Interpreting
18 import Language.Symantic.Transforming
19 import Language.Symantic.Lib.Lambda
20
21 -- * Class 'Sym_Functor'
22 class Sym_Lambda term => Sym_Functor term where
23 fmap :: Functor f => term (a -> b) -> term (f a) -> term (f b)
24 default fmap
25 :: (Trans t term, Functor f)
26 => t term (a -> b)
27 -> t term (f a)
28 -> t term (f b)
29 fmap = trans_map2 fmap
30
31 (<$) :: Functor f => term a -> term (f b) -> term (f a); infixl 4 <$
32 (<$) a = fmap (lam (Fun.const a))
33
34
35 type instance Sym_of_Iface (Proxy Functor) = Sym_Functor
36 type instance TyConsts_of_Iface (Proxy Functor) = Proxy Functor ': TyConsts_imported_by Functor
37 type instance TyConsts_imported_by Functor = '[]
38
39 instance Sym_Functor HostI where
40 fmap = liftM2 Functor.fmap
41 (<$) = liftM2 (Functor.<$)
42 instance Sym_Functor TextI where
43 fmap = textI2 "fmap"
44 (<$) = textI_infix "<$" (infixL 4)
45 instance (Sym_Functor r1, Sym_Functor r2) => Sym_Functor (DupI r1 r2) where
46 fmap = dupI2 @Sym_Functor fmap
47 (<$) = dupI2 @Sym_Functor (<$)
48
49 -- | 'fmap' alias.
50 (<$>) :: (Sym_Functor term, Functor f)
51 => term (a -> b) -> term (f a) -> term (f b)
52 (<$>) = fmap
53 infixl 4 <$>
54
55 instance
56 ( Read_TyNameR TyName cs rs
57 , Inj_TyConst cs Functor
58 ) => Read_TyNameR TyName cs (Proxy Functor ': rs) where
59 read_TyNameR _cs (TyName "Functor") k = k (ty @Functor)
60 read_TyNameR _rs raw k = read_TyNameR (Proxy @rs) raw k
61 instance Show_TyConst cs => Show_TyConst (Proxy Functor ': cs) where
62 show_TyConst TyConstZ{} = "Functor"
63 show_TyConst (TyConstS c) = show_TyConst c
64
65 instance Proj_TyConC cs (Proxy Functor)
66 data instance TokenT meta (ts::[*]) (Proxy Functor)
67 = Token_Term_Functor_fmap (EToken meta ts) (EToken meta ts)
68 | Token_Term_Functor_const (EToken meta ts) (EToken meta ts)
69 deriving instance Eq_Token meta ts => Eq (TokenT meta ts (Proxy Functor))
70 deriving instance Show_Token meta ts => Show (TokenT meta ts (Proxy Functor))
71 instance -- CompileI
72 ( Inj_TyConst (TyConsts_of_Ifaces is) Functor
73 , Inj_TyConst (TyConsts_of_Ifaces is) (->)
74 , Proj_TyCon (TyConsts_of_Ifaces is)
75 , Compile is
76 ) => CompileI is (Proxy Functor) where
77 compileI tok ctx k =
78 case tok of
79 Token_Term_Functor_fmap tok_a2b tok_fa ->
80 -- fmap :: Functor f => (a -> b) -> f a -> f b
81 compileO tok_a2b ctx $ \ty_a2b (TermO a2b) ->
82 compileO tok_fa ctx $ \ty_fa (TermO fa) ->
83 check_TyEq2 (ty @(->))
84 (At (Just tok_a2b) ty_a2b) $ \Refl ty_a2b_a ty_a2b_b ->
85 check_TyCon1 (ty @Functor)
86 (At (Just tok_fa) ty_fa) $ \Refl TyCon ty_fa_f ty_fa_a ->
87 check_TyEq
88 (At (Just tok_a2b) ty_a2b_a)
89 (At (Just tok_fa) ty_fa_a) $ \Refl ->
90 k (ty_fa_f :$ ty_a2b_b) $ TermO $
91 \c -> fmap (a2b c) (fa c)
92 Token_Term_Functor_const tok_a tok_fb ->
93 -- (<$) :: Functor f => a -> f b -> f a
94 compileO tok_a ctx $ \ty_a (TermO a) ->
95 compileO tok_fb ctx $ \ty_fb (TermO fb) ->
96 check_TyCon1 (ty @Functor)
97 (At (Just tok_fb) ty_fb) $ \Refl TyCon ty_fb_f _ty_fb_b ->
98 k (ty_fb_f :$ ty_a) $ TermO $
99 \c -> (<$) (a c) (fb c)
100 instance -- TokenizeT
101 Inj_Token meta ts Functor =>
102 TokenizeT meta ts (Proxy Functor) where
103 tokenizeT _t = mempty
104 { tokenizers_infix = tokenizeTMod []
105 [ tokenize2 "fmap" infixN5 Token_Term_Functor_fmap
106 , tokenize2 "<$" (infixL 4) Token_Term_Functor_const
107 , tokenize2 "<$>" (infixL 4) Token_Term_Functor_fmap
108 ]
109 }
110 instance Gram_Term_AtomsT meta ts (Proxy Functor) g